Update whatsnew

* Fix crash when accessing closed connections

Releasing.md

@@ -1,8 +1,9 @@
 # Releasing
 
 - do tests
-- update translations using ``tx pull -a -af`` (as extra merge request or branch for the case it does not build correctly)
-- update the version name and version code of the app
+- update translations using ``tx pull -af`` (as extra merge request or branch for the case it does not build correctly)
+- update the version name and version code of the app [here](https://github.com/syncthing/syncthing-lite/blob/master/app/build.gradle)
 - update the changelog at [app/src/main/play/en-GB/whatsnew](https://github.com/syncthing/syncthing-lite/blob/master/app/src/main/play/en-GB/whatsnew)
 - create a tag/ release in GitHub with an changelog; The tag name should be the version number
-- F-Droid picks up the release by the tag; additonally, the tag triggers a CI build which uploads the generated APK to Google Play
+- trigger a release at <https://build.syncthing.net/> to publish the release to google play
+- F-Droid picks up the release by the tag

Roadmap.md

@@ -0,0 +1,20 @@
+# Roadmap
+
+## What should happen
+
+- fixing bugs and crashs
+  - just create a issue WITH a detailed crash report (not: it does not work)
+  - search if there is an other issue for it before creating a new one
+- add option to manually select the IP address of an device (<https://github.com/syncthing/syncthing-lite/issues/25>)
+- allow custom discovery servers or disabling device discovery (<https://github.com/syncthing/syncthing-lite/issues/105>)
+- downloading all files of an folder (<https://github.com/syncthing/syncthing-lite/issues/34>)
+- better server offline handling (<https://github.com/syncthing/syncthing-lite/issues/63>)
+- file uploading support (it currently does not work) <https://github.com/syncthing/syncthing-lite/issues/70>
+
+## What could happen
+
+- thumbnails (<https://github.com/syncthing/syncthing-lite/issues/37>)
+
+## What will not happen
+
+- additional encryption within the App (see <https://github.com/syncthing/syncthing-lite/issues/85>)

app/build.gradle

@@ -6,7 +6,6 @@ apply plugin: 'com.github.triplet.play'
 
 android {
     compileSdkVersion 27
-    buildToolsVersion "28.0.2"
     dataBinding.enabled = true
 
     playAccountConfigs {
@@ -19,8 +18,8 @@ android {
         applicationId "net.syncthing.lite"
         minSdkVersion 21
         targetSdkVersion 26
-        versionCode 15
-        versionName "0.3.5"
+        versionCode 19
+        versionName "0.3.9"
         multiDexEnabled true
         playAccountConfig = playAccountConfigs.defaultAccountConfig
     }
@@ -77,16 +76,6 @@ dependencies {
     implementation "com.android.support:support-v4:$support_version"
     implementation 'android.arch.lifecycle:extensions:1.1.1'
 
-    /**
-     * syncthing-java depends on the Apache HTTP Client
-     * https://github.com/syncthing/syncthing-java/blob/dd020737ba5fc6a7c681a1d258025b8ddb2e8f67/core/build.gradle#L9
-     *
-     * Android itself contains an older version of this HTTP Client. Due to that, there is an
-     * extra version of it which does not cause conflicts with the builtin client of Android.
-     *
-     * This extra implementation is included below. As this other version is used,
-     * it's ignored as dependency of syncthing-java.
-     */
     implementation(project(':syncthing-client')) {
         exclude group: 'commons-logging', module: 'commons-logging'
         exclude group: 'org.slf4j'
@@ -99,4 +88,5 @@ dependencies {
     implementation 'com.github.apl-devs:appintro:v4.2.3'
 
     implementation project(':syncthing-repository-android')
+    implementation project(':syncthing-temp-repository-encryption')
 }

app/proguard-rules.pro

@@ -28,6 +28,9 @@
   volatile <fields>;
 }
 
+# fix detecting the main dispatcher
+-keepnames class kotlinx.coroutines.internal.MainDispatcherFactory {}
+
 # disable warnings
 -dontwarn com.google.protobuf.UnsafeUtil
 -dontwarn com.google.protobuf.UnsafeUtil$1

app/src/main/kotlin/net/syncthing/lite/activities/FolderBrowserActivity.kt

@@ -4,48 +4,61 @@ import android.app.Activity
 import android.content.Intent
 import android.databinding.DataBindingUtil
 import android.os.Bundle
-import android.util.Log
-import kotlinx.coroutines.CompletableDeferred
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.GlobalScope
-import kotlinx.coroutines.launch
-import net.syncthing.java.bep.IndexBrowser
+import kotlinx.coroutines.*
+import kotlinx.coroutines.channels.ConflatedBroadcastChannel
+import kotlinx.coroutines.channels.consumeEach
+import net.syncthing.java.bep.index.browser.DirectoryContentListing
+import net.syncthing.java.bep.index.browser.DirectoryListing
+import net.syncthing.java.bep.index.browser.DirectoryNotFoundListing
+import net.syncthing.java.bep.index.browser.IndexBrowser
 import net.syncthing.java.core.beans.FileInfo
-import net.syncthing.java.core.beans.FolderInfo
 import net.syncthing.java.core.utils.PathUtils
-import net.syncthing.lite.BuildConfig
 import net.syncthing.lite.R
 import net.syncthing.lite.adapters.FolderContentsAdapter
 import net.syncthing.lite.adapters.FolderContentsListener
 import net.syncthing.lite.databinding.ActivityFolderBrowserBinding
+import net.syncthing.lite.dialogs.EnableFolderSyncForNewDeviceDialog
 import net.syncthing.lite.dialogs.FileMenuDialogFragment
 import net.syncthing.lite.dialogs.FileUploadDialog
 import net.syncthing.lite.dialogs.ReconnectIssueDialogFragment
 import net.syncthing.lite.dialogs.downloadfile.DownloadFileDialogFragment
-import org.jetbrains.anko.doAsync
 
 class FolderBrowserActivity : SyncthingActivity() {
 
     companion object {
-
-        private const val TAG = "FolderBrowserActivity"
         private const val REQUEST_SELECT_UPLOAD_FILE = 171
-
+        private const val STATUS_PATH = "path"
         const val EXTRA_FOLDER_NAME = "folder_name"
     }
 
-    private lateinit var binding: ActivityFolderBrowserBinding
-    private lateinit var indexBrowser: IndexBrowser
-    private val adapter = FolderContentsAdapter()
+    private lateinit var folder: String
+
+    private val path = ConflatedBroadcastChannel<String>()
+    private val listing = ConflatedBroadcastChannel<DirectoryListing?>(null)
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        binding = DataBindingUtil.setContentView(this, R.layout.activity_folder_browser)
-        binding.mainListViewUploadHereButton.setOnClickListener { showUploadHereDialog() }
+
+        val binding: ActivityFolderBrowserBinding = DataBindingUtil.setContentView(this, R.layout.activity_folder_browser)
+        val adapter = FolderContentsAdapter()
+
         binding.listView.adapter = adapter
+        binding.mainListViewUploadHereButton.setOnClickListener {
+            startActivityForResult(
+                    Intent(Intent.ACTION_OPEN_DOCUMENT).apply {
+                        addCategory(Intent.CATEGORY_OPENABLE)
+                        type = "*/*"
+                    },
+                    REQUEST_SELECT_UPLOAD_FILE
+            )
+        }
         adapter.listener = object: FolderContentsListener {
             override fun onItemClicked(fileInfo: FileInfo) {
-                navigateToFolder(fileInfo)
+                if (fileInfo.isDirectory()) {
+                    path.offer(fileInfo.path)
+                } else {
+                    DownloadFileDialogFragment.newInstance(fileInfo).show(supportFragmentManager)
+                }
             }
 
             override fun onItemLongClicked(fileInfo: FileInfo): Boolean {
@@ -58,26 +71,98 @@ class FolderBrowserActivity : SyncthingActivity() {
                 }
             }
         }
-        val folder = intent.getStringExtra(EXTRA_FOLDER_NAME)
-        libraryHandler.syncthingClient {
-            indexBrowser = it.indexHandler.newIndexBrowser(folder, true, true)
-            indexBrowser.setOnFolderChangedListener(this::onFolderChanged)
-        }
 
         ReconnectIssueDialogFragment.showIfNeeded(this)
+
+        folder = intent.getStringExtra(EXTRA_FOLDER_NAME)
+        path.offer(if (savedInstanceState == null) IndexBrowser.ROOT_PATH else savedInstanceState.getString(STATUS_PATH))
+
+        launch {
+            var job = Job()
+
+            path.consumeEach { path ->
+                job.cancel()
+                job = Job()
+
+                binding.listView.scrollToPosition(0)
+
+                listing.send(null)
+
+                async(job) {
+                    libraryHandler.libraryManager.streamDirectoryListing(folder, path).consumeEach {
+                        listing.send(it)
+                    }
+                }
+            }
+        }
+
+        launch {
+            listing.openSubscription().consumeEach { listing ->
+                if (listing == null) {
+                    binding.isLoading = true
+                } else {
+                    supportActionBar?.title = if (PathUtils.isRoot(listing.path)) folder else PathUtils.getFileName(listing.path)
+                    binding.isLoading = false
+                    adapter.data = if (listing is DirectoryContentListing)
+                        listing.entries.sortedWith(IndexBrowser.sortAlphabeticallyDirectoriesFirst)
+                    else
+                        emptyList()
+                }
+            }
+        }
+
+        if (savedInstanceState == null) {
+            launch {
+                val devicesToAskFor = libraryHandler.libraryManager.withLibrary {
+                    val folderInfo = it.configuration.folders.find { it.folderId == folder }
+                    val notIgnoredBlacklistEntries = folderInfo?.notIgnoredBlacklistEntries ?: emptySet()
+
+                    notIgnoredBlacklistEntries.mapNotNull { deviceId ->
+                        it.configuration.peers.find { peer -> peer.deviceId == deviceId }
+                    }
+                }
+
+                if (devicesToAskFor.isNotEmpty()) {
+                    EnableFolderSyncForNewDeviceDialog.newInstance(
+                            folderId = folder,
+                            devices = devicesToAskFor,
+                            folderName = libraryHandler.libraryManager.withLibrary {
+                                it.configuration.folders.find { it.folderId == folder }?.label ?: folder
+                            }
+                    ).show(supportFragmentManager)
+                }
+            }
+        }
     }
 
-    override fun onDestroy() {
-        super.onDestroy()
-        Thread {
-            indexBrowser.setOnFolderChangedListener(null)
-            indexBrowser.close()
-        }.start()
+    override fun onSaveInstanceState(outState: Bundle) {
+        super.onSaveInstanceState(outState)
+
+        outState.putString(STATUS_PATH, path.value)
+    }
+
+    private fun goUp(): Boolean {
+        val currentListing = listing.value
+
+        val parentPath = when (currentListing) {
+            is DirectoryContentListing -> currentListing.parentEntry?.path
+            is DirectoryNotFoundListing -> currentListing.theoreticalParentPath
+            else -> null
+        }
+
+        return if (parentPath == null) {
+            false
+        } else {
+            path.offer(parentPath)
+
+            true
+        }
     }
 
     override fun onBackPressed() {
-        //click item '0', ie '..' (go to parent)
-        navigateToFolder(adapter.data[0])
+        if (!goUp()) {
+            super.onBackPressed()
+        }
     }
 
     override fun onActivityResult(requestCode: Int, resultCode: Int, intent: Intent?) {
@@ -85,85 +170,18 @@ class FolderBrowserActivity : SyncthingActivity() {
             libraryHandler.syncthingClient { syncthingClient ->
                 GlobalScope.launch (Dispatchers.Main) {
                     // FIXME: it would be better if the dialog would use the library handler
-                    FileUploadDialog(this@FolderBrowserActivity, syncthingClient, intent!!.data,
-                            indexBrowser.folder, indexBrowser.currentPath,
-                            { showFolderListView(indexBrowser.currentPath) }).show()
+                    FileUploadDialog(
+                            this@FolderBrowserActivity,
+                            syncthingClient,
+                            intent!!.data,
+                            folder,
+                            path.value,
+                            { /* nothing to do on success */ }
+                    ).show()
                 }
             }
         } else {
             super.onActivityResult(requestCode, resultCode, intent)
         }
     }
-
-    private fun showFolderListView(path: String) {
-        indexBrowser.navigateToNearestPath(path)
-        navigateToFolder(indexBrowser.currentPathInfo())
-    }
-
-    private fun navigateToFolder(fileInfo: FileInfo) {
-        Log.d(TAG, "navigate to path = '" + fileInfo.path + "' from path = '" + indexBrowser.currentPath + "'")
-        if (indexBrowser.isRoot() && PathUtils.isParent(fileInfo.path)) {
-            finish()
-        } else {
-            if (fileInfo.isDirectory()) {
-                doAsync {
-                    indexBrowser.navigateTo(fileInfo)
-                }
-
-                Log.d(TAG, "load folder cache bg")
-                binding.isLoading = true
-            } else {
-                if (BuildConfig.DEBUG) {
-                    Log.i(TAG, "pulling file = " + fileInfo)
-                }
-
-                DownloadFileDialogFragment.newInstance(fileInfo).show(supportFragmentManager)
-            }
-        }
-    }
-
-    private fun onFolderChanged() {
-        GlobalScope.launch {
-            val list = indexBrowser.listFiles()
-
-            Log.i("navigateToFolder", "list for path = '" + indexBrowser.currentPath + "' list = " + list.size + " records")
-            Log.d("navigateToFolder", "list for path = '" + indexBrowser.currentPath + "' list = " + list)
-            assert(!list.isEmpty())//list must contain at least the 'parent' path
-
-            val title = if (indexBrowser.isRoot()) {
-                val result = CompletableDeferred<String?>()
-
-                libraryHandler.folderBrowser {
-                    result.complete(it.getFolderInfo(indexBrowser.folder)?.label)
-                }
-
-                result.await()
-            } else {
-                indexBrowser.currentPathInfo().fileName
-            }
-
-            runOnUiThread {
-                binding.isLoading = false
-                adapter.data = list
-                binding.listView.scrollToPosition(0)
-                supportActionBar?.title = title
-            }
-        }
-    }
-
-    private fun updateFolderListView() {
-        showFolderListView(indexBrowser.currentPath)
-    }
-
-    private fun showUploadHereDialog() {
-        val intent = Intent(Intent.ACTION_OPEN_DOCUMENT)
-        intent.addCategory(Intent.CATEGORY_OPENABLE)
-        intent.type = "*/*"
-        startActivityForResult(intent, REQUEST_SELECT_UPLOAD_FILE)
-    }
-
-    override fun onIndexUpdateComplete(folderInfo: FolderInfo) {
-        super.onIndexUpdateComplete(folderInfo)
-        updateFolderListView()
-    }
 }

app/src/main/kotlin/net/syncthing/lite/activities/IntroActivity.kt

@@ -12,9 +12,9 @@ import android.view.View
 import android.view.ViewGroup
 import android.widget.Button
 import com.github.paolorotolo.appintro.AppIntro
+import com.github.paolorotolo.appintro.ISlidePolicy
 import com.google.zxing.integration.android.IntentIntegrator
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.channels.consumeEach
 import kotlinx.coroutines.launch
 import net.syncthing.java.core.beans.DeviceId
 import net.syncthing.lite.R
@@ -40,14 +40,6 @@ class IntroActivity : AppIntro() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
-        // Disable continue button on second slide until a valid device ID is entered.
-        nextButton.setOnClickListener {
-            val fragment = fragments[pager.currentItem]
-            if (fragment !is IntroFragmentTwo || fragment.isDeviceIdValid()) {
-                pager.goToNextSlide()
-            }
-        }
-
         addSlide(IntroFragmentOne())
         addSlide(IntroFragmentTwo())
         addSlide(IntroFragmentThree())
@@ -72,6 +64,19 @@ class IntroActivity : AppIntro() {
      * Display some simple welcome text.
      */
     class IntroFragmentOne : SyncthingFragment() {
+        override fun onCreate(savedInstanceState: Bundle?) {
+            super.onCreate(savedInstanceState)
+
+            launch {
+                libraryHandler.libraryManager.withLibrary { library ->
+                    library.configuration.update { oldConfig ->
+                        oldConfig.copy(localDeviceName = Util.getDeviceName())
+                    }
+
+                    library.configuration.persistLater()
+                }
+            }
+        }
 
         override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View {
             val binding = FragmentIntroOneBinding.inflate(inflater, container, false)
@@ -80,21 +85,12 @@ class IntroActivity : AppIntro() {
 
             return binding.root
         }
-
-        override fun onLibraryLoaded() {
-            super.onLibraryLoaded()
-
-            libraryHandler.configuration { config ->
-                config.localDeviceName = Util.getDeviceName()
-                config.persistLater()
-            }
-        }
     }
 
     /**
      * Display device ID entry field and QR scanner option.
      */
-    class IntroFragmentTwo : SyncthingFragment() {
+    class IntroFragmentTwo : SyncthingFragment(), ISlidePolicy {
 
         private lateinit var binding: FragmentIntroTwoBinding
 
@@ -122,7 +118,7 @@ class IntroActivity : AppIntro() {
         fun isDeviceIdValid(): Boolean {
             return try {
                 val deviceId = binding.enterDeviceId.deviceId.text.toString()
-                Util.importDeviceId(libraryHandler, context, deviceId, { })
+                Util.importDeviceId(libraryHandler.libraryManager, context!!, deviceId, { })
                 true
             } catch (e: IOException) {
                 binding.enterDeviceId.deviceId.error = getString(R.string.invalid_device_id)
@@ -130,6 +126,12 @@ class IntroActivity : AppIntro() {
             }
         }
 
+        override fun isPolicyRespected() = isDeviceIdValid()
+
+        override fun onUserIllegallyRequestedNextPage() {
+            // nothing to do, but some user feedback would be nice
+        }
+
         private val addedDeviceIds = HashSet<DeviceId>()
 
         override fun onResume() {
@@ -176,32 +178,31 @@ class IntroActivity : AppIntro() {
      */
     class IntroFragmentThree : SyncthingFragment() {
 
-        private lateinit var binding: FragmentIntroThreeBinding
-
         override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View {
-            binding = DataBindingUtil.inflate(inflater, R.layout.fragment_intro_three, container, false)
+            val binding = FragmentIntroThreeBinding.inflate(inflater, container, false)
 
-            libraryHandler.library { config, client, _ ->
-                GlobalScope.launch (Dispatchers.Main) {
-                    client.addOnConnectionChangedListener(this@IntroFragmentThree::onConnectionChanged)
-                    val deviceId = config.localDeviceId.deviceId
-                    val desc = activity?.getString(R.string.intro_page_three_description, "<b>$deviceId</b>")
-                    binding.description.text = Html.fromHtml(desc)
+            launch {
+                val ownDeviceId = libraryHandler.libraryManager.withLibrary { it.configuration.localDeviceId }
+
+                libraryHandler.subscribeToConnectionStatus().consumeEach {
+                    if (it.values.find { it.addresses.isNotEmpty() } != null) {
+                        val desc = activity?.getString(R.string.intro_page_three_description, "<b>$ownDeviceId</b>")
+                        binding.description.text = Html.fromHtml(desc)
+                    } else {
+                        binding.description.text = getString(R.string.intro_page_three_searching_device)
+                    }
+                }
+            }
+
+            launch {
+                libraryHandler.subscribeToFolderStatusList().consumeEach {
+                    if (it.isNotEmpty()) {
+                        (activity as IntroActivity?)?.onDonePressed(this@IntroFragmentThree)
+                    }
                 }
             }
 
             return binding.root
         }
-
-        private fun onConnectionChanged(deviceId: DeviceId) {
-            libraryHandler.library { config, client, _ ->
-                GlobalScope.launch (Dispatchers.Main) {
-                    if (config.folders.isNotEmpty()) {
-                        client.removeOnConnectionChangedListener(this@IntroFragmentThree::onConnectionChanged)
-                        (activity as IntroActivity?)?.onDonePressed(this@IntroFragmentThree)
-                    }
-                }
-            }
-        }
     }
 }

app/src/main/kotlin/net/syncthing/lite/activities/MainActivity.kt

@@ -102,9 +102,10 @@ class MainActivity : SyncthingActivity() {
     }
 
     private fun cleanCacheAndIndex() {
-        GlobalScope.launch (Dispatchers.Main) {
-            libraryHandler.syncthingClient { it.clearCacheAndIndex() }
-            recreate()
+        launch {
+            libraryHandler.libraryManager.withLibrary {
+                it.syncthingClient.clearCacheAndIndex()
+            }
         }
     }
 }

app/src/main/kotlin/net/syncthing/lite/activities/SyncthingActivity.kt

@@ -4,22 +4,18 @@ import android.app.AlertDialog
 import android.databinding.DataBindingUtil
 import android.os.Bundle
 import android.support.design.widget.Snackbar
-import android.support.v7.app.AppCompatActivity
 import android.view.LayoutInflater
-import net.syncthing.java.core.beans.FolderInfo
 import net.syncthing.lite.BuildConfig
 import net.syncthing.lite.R
+import net.syncthing.lite.async.CoroutineActivity
 import net.syncthing.lite.databinding.DialogLoadingBinding
 import net.syncthing.lite.library.LibraryHandler
-import org.jetbrains.anko.contentView
 import org.slf4j.impl.HandroidLoggerAdapter
 
-abstract class SyncthingActivity : AppCompatActivity() {
+abstract class SyncthingActivity : CoroutineActivity() {
     val libraryHandler: LibraryHandler by lazy {
         LibraryHandler(
-                context = this@SyncthingActivity,
-                onIndexUpdateProgressListener = this::onIndexUpdateProgress,
-                onIndexUpdateCompleteListener = this::onIndexUpdateComplete
+                context = this@SyncthingActivity
         )
     }
     private var loadingDialog: AlertDialog? = null
@@ -58,19 +54,6 @@ abstract class SyncthingActivity : AppCompatActivity() {
         loadingDialog?.dismiss()
     }
 
-    open fun onIndexUpdateProgress(folderInfo: FolderInfo, percentage: Int) {
-        val message = getString(R.string.index_update_progress_label, folderInfo.label, percentage)
-        snackBar?.setText(message) ?: run {
-            snackBar = Snackbar.make(contentView!!, message, Snackbar.LENGTH_INDEFINITE)
-            snackBar?.show()
-        }
-    }
-
-    open fun onIndexUpdateComplete(folderInfo: FolderInfo) {
-        snackBar?.dismiss()
-        snackBar = null
-    }
-
     open fun onLibraryLoaded() {
         // nothing to do
     }

app/src/main/kotlin/net/syncthing/lite/adapters/DevicesAdapter.kt

@@ -3,12 +3,15 @@ package net.syncthing.lite.adapters
 import android.support.v7.widget.RecyclerView
 import android.view.LayoutInflater
 import android.view.ViewGroup
+import net.syncthing.java.bep.connectionactor.ConnectionInfo
+import net.syncthing.java.bep.connectionactor.ConnectionStatus
 import net.syncthing.java.core.beans.DeviceInfo
+import net.syncthing.lite.R
 import net.syncthing.lite.databinding.ListviewDeviceBinding
 import kotlin.properties.Delegates
 
 class DevicesAdapter: RecyclerView.Adapter<DeviceViewHolder>() {
-    var data: List<DeviceInfo> by Delegates.observable(listOf()) {
+    var data: List<Pair<DeviceInfo, ConnectionInfo>> by Delegates.observable(listOf()) {
         _, _, _ -> notifyDataSetChanged()
     }
 
@@ -19,7 +22,7 @@ class DevicesAdapter: RecyclerView.Adapter<DeviceViewHolder>() {
     }
 
     override fun getItemCount() = data.size
-    override fun getItemId(position: Int) = data[position].deviceId.deviceId.hashCode().toLong()
+    override fun getItemId(position: Int) = data[position].first.deviceId.deviceId.hashCode().toLong()
 
     override fun onCreateViewHolder(parent: ViewGroup, viewType: Int) = DeviceViewHolder(
             ListviewDeviceBinding.inflate(
@@ -28,13 +31,23 @@ class DevicesAdapter: RecyclerView.Adapter<DeviceViewHolder>() {
     )
 
     override fun onBindViewHolder(holder: DeviceViewHolder, position: Int) {
-        val deviceStats = data[position]
         val binding = holder.binding
+        val context = binding.root.context
+        val (deviceInfo, connectionInfo) = data[position]
 
-        binding.name = deviceStats.name
-        binding.isConnected = deviceStats.isConnected
+        binding.name = deviceInfo.name
+        binding.isConnected = connectionInfo.status == ConnectionStatus.Connected
 
-        binding.root.setOnLongClickListener { listener?.onDeviceLongClicked(deviceStats) ?: false }
+        binding.status = when (connectionInfo.status) {
+            ConnectionStatus.Connected -> context.getString(R.string.device_status_connected, connectionInfo.currentAddress?.address)
+            ConnectionStatus.Connecting -> context.getString(R.string.device_status_connecting, connectionInfo.currentAddress?.address)
+            ConnectionStatus.Disconnected -> if (connectionInfo.addresses.isEmpty())
+                context.getString(R.string.device_status_no_address)
+            else
+                context.getString(R.string.device_status_disconnected, connectionInfo.addresses.size)
+        }
+
+        binding.root.setOnLongClickListener { listener?.onDeviceLongClicked(deviceInfo) ?: false }
 
         binding.executePendingBindings()
     }
@@ -44,4 +57,4 @@ interface DeviceAdapterListener {
     fun onDeviceLongClicked(deviceInfo: DeviceInfo): Boolean
 }
 
-class DeviceViewHolder(val binding: ListviewDeviceBinding): RecyclerView.ViewHolder(binding.root)
+class DeviceViewHolder(val binding: ListviewDeviceBinding): RecyclerView.ViewHolder(binding.root)

app/src/main/kotlin/net/syncthing/lite/adapters/FoldersListAdapter.kt

@@ -2,8 +2,10 @@ package net.syncthing.lite.adapters
 
 import android.support.v7.widget.RecyclerView
 import android.text.format.DateUtils
+import android.util.Log
 import android.view.LayoutInflater
 import android.view.ViewGroup
+import net.syncthing.java.bep.folder.FolderStatus
 import net.syncthing.java.core.beans.FolderInfo
 import net.syncthing.java.core.beans.FolderStats
 import net.syncthing.lite.R
@@ -11,7 +13,7 @@ import net.syncthing.lite.databinding.ListviewFolderBinding
 import kotlin.properties.Delegates
 
 class FoldersListAdapter: RecyclerView.Adapter<FolderListViewHolder>() {
-    var data: List<Pair<FolderInfo, FolderStats>> by Delegates.observable(listOf()) {
+    var data: List<FolderStatus> by Delegates.observable(listOf()) {
         _, _, _ -> notifyDataSetChanged()
     }
 
@@ -22,7 +24,7 @@ class FoldersListAdapter: RecyclerView.Adapter<FolderListViewHolder>() {
     }
 
     override fun getItemCount() = data.size
-    override fun getItemId(position: Int) = data[position].first.folderId.hashCode().toLong()
+    override fun getItemId(position: Int) = data[position].info.folderId.hashCode().toLong()
 
     override fun onCreateViewHolder(parent: ViewGroup, viewType: Int) = FolderListViewHolder (
             ListviewFolderBinding.inflate(
@@ -32,19 +34,31 @@ class FoldersListAdapter: RecyclerView.Adapter<FolderListViewHolder>() {
 
     override fun onBindViewHolder(holder: FolderListViewHolder, position: Int) {
         val binding = holder.binding
-        val (folderInfo, folderStats) = data[position]
+        val item = data[position]
+        val (folderInfo, folderStats) = item
         val context = holder.itemView.context
 
+        Log.d("FolderListAdapter", "$item")
+
         binding.folderName = context.getString(R.string.folder_label_format, folderInfo.label, folderInfo.folderId)
 
         binding.lastModification = context.getString(R.string.last_modified_time,
                 DateUtils.getRelativeDateTimeString(context, folderStats.lastUpdate.time, DateUtils.MINUTE_IN_MILLIS, DateUtils.WEEK_IN_MILLIS, 0))
 
-        binding.info = context.getString(R.string.folder_content_info, folderStats.describeSize(), folderStats.fileCount, folderStats.dirCount)
+        binding.info = context.getString(R.string.folder_content_info, folderStats.sizeDescription, folderStats.fileCount, folderStats.dirCount)
+
+        binding.info2 = if (item.missingIndexUpdates == 0L)
+            null
+        else
+            context.getString(R.string.pending_index_updates, item.missingIndexUpdates)
 
         binding.root.setOnClickListener {
             listener?.onFolderClicked(folderInfo, folderStats)
         }
+
+        binding.root.setOnLongClickListener {
+            listener?.onFolderLongClicked(folderInfo) ?: false
+        }
     }
 }
 
@@ -52,4 +66,5 @@ class FolderListViewHolder(val binding: ListviewFolderBinding): RecyclerView.Vie
 
 interface FolderListAdapterListener {
     fun onFolderClicked(folderInfo: FolderInfo, folderStats: FolderStats)
-}
+    fun onFolderLongClicked(folderInfo: FolderInfo): Boolean
+}

app/src/main/kotlin/net/syncthing/lite/android/Application.kt

@@ -1,52 +1,48 @@
 package net.syncthing.lite.android
 
 import android.app.Application
-import android.content.ClipData
-import android.content.ClipboardManager
-import android.content.Context
+import android.os.Handler
+import android.os.Looper
 import android.util.Log
-import net.syncthing.lite.BuildConfig
-import org.jetbrains.anko.defaultSharedPreferences
-import java.io.PrintWriter
-import java.io.StringWriter
+import net.syncthing.lite.error.ErrorStorage
 
 class Application: Application() {
     companion object {
         private const val LOG_TAG = "Application"
-        private const val PREF_ENABLE_CRASH_HANDLER = "crash_handler"
+        private val handler = Handler(Looper.getMainLooper())
     }
 
     override fun onCreate() {
         super.onCreate()
 
-        val clipboard = getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager
         val defaultHandler = Thread.getDefaultUncaughtExceptionHandler()
+        val mainThread = Thread.currentThread()
 
         if (defaultHandler == null) {
             Log.w(LOG_TAG, "could not get default crash handler")
         }
 
-        Thread.setDefaultUncaughtExceptionHandler { thread, ex ->
+        fun handleCrash(ex: Throwable) {
             Log.w(LOG_TAG, "app crashed", ex)
 
-            val enableCustomCrashHandling = defaultSharedPreferences.getBoolean(PREF_ENABLE_CRASH_HANDLER, false)
-
-            if (enableCustomCrashHandling) {
-                clipboard.primaryClip = ClipData.newPlainText(
-                        "stacktrace",
-                        StringWriter().apply {
-                            append("Version: ").append(BuildConfig.VERSION_NAME).append('\n')
-                            append(Log.getStackTraceString(ex)).append('\n')
-                            ex.printStackTrace(PrintWriter(this))
-                        }.buffer.toString()
-                )
-            }
+            ErrorStorage.reportError(
+                    this,
+                    Log.getStackTraceString(ex)
+            )
 
             if (defaultHandler != null) {
-                defaultHandler.uncaughtException(thread, ex)
+                defaultHandler.uncaughtException(mainThread, ex)
             } else {
                 System.exit(1)
             }
         }
+
+        Thread.setDefaultUncaughtExceptionHandler { thread, ex ->
+            if (Looper.getMainLooper() === Looper.myLooper()) {
+                handleCrash(ex)
+            } else {
+                handler.post { handleCrash(ex) }
+            }
+        }
     }
 }

app/src/main/kotlin/net/syncthing/lite/async/CoroutineActivity.kt

@@ -0,0 +1,19 @@
+package net.syncthing.lite.async
+
+import android.support.v7.app.AppCompatActivity
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlin.coroutines.CoroutineContext
+
+abstract class CoroutineActivity: AppCompatActivity(), CoroutineScope {
+    val job = Job()
+
+    override val coroutineContext: CoroutineContext
+        get() = job + Dispatchers.Main
+
+    override fun onDestroy() {
+        super.onDestroy()
+        job.cancel()
+    }
+}

app/src/main/kotlin/net/syncthing/lite/async/CoroutineDialogFragment.kt

@@ -0,0 +1,19 @@
+package net.syncthing.lite.async
+
+import android.support.v4.app.DialogFragment
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlin.coroutines.CoroutineContext
+
+abstract class CoroutineDialogFragment: DialogFragment(), CoroutineScope {
+    val job = Job()
+
+    override val coroutineContext: CoroutineContext
+        get() = job + Dispatchers.Main
+
+    override fun onDestroy() {
+        super.onDestroy()
+        job.cancel()
+    }
+}

app/src/main/kotlin/net/syncthing/lite/async/CoroutineFragment.kt

@@ -0,0 +1,19 @@
+package net.syncthing.lite.async
+
+import android.support.v4.app.Fragment
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlin.coroutines.CoroutineContext
+
+abstract class CoroutineFragment: Fragment(), CoroutineScope {
+    val job = Job()
+
+    override val coroutineContext: CoroutineContext
+        get() = job + Dispatchers.Main
+
+    override fun onDestroy() {
+        super.onDestroy()
+        job.cancel()
+    }
+}

app/src/main/kotlin/net/syncthing/lite/dialogs/EnableFolderSyncForNewDeviceDialog.kt

@@ -0,0 +1,125 @@
+package net.syncthing.lite.dialogs
+
+import android.app.AlertDialog
+import android.app.Dialog
+import android.os.Bundle
+import android.support.v4.app.FragmentManager
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.launch
+import net.syncthing.java.core.beans.DeviceInfo
+import net.syncthing.lite.R
+import net.syncthing.lite.fragments.SyncthingDialogFragment
+
+class EnableFolderSyncForNewDeviceDialog: SyncthingDialogFragment() {
+    companion object {
+        private const val FOLDER_ID = "folderId"
+        private const val FOLDER_NAME = "folderName"
+        private const val DEVICES = "devices"
+        private const val STATUS_CURRENT_DEVICE_ID = "currentDeviceId"
+
+        private const val TAG = "EnableFolderSyncForNewDeviceDialog"
+
+        fun newInstance(folderId: String, folderName: String, devices: List<DeviceInfo>) = EnableFolderSyncForNewDeviceDialog().apply {
+            arguments = Bundle().apply {
+                putString(FOLDER_ID, folderId)
+                putString(FOLDER_NAME, folderName)
+                putSerializable(DEVICES, ArrayList<DeviceInfo>(devices))
+            }
+        }
+    }
+
+    private var currentDeviceId = 0
+
+    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
+        val folderId = arguments!!.getString(FOLDER_ID)
+        val folderName = arguments!!.getString(FOLDER_NAME)
+        val devices = arguments!!.getSerializable(DEVICES) as ArrayList<DeviceInfo>
+
+        if (savedInstanceState != null) {
+            currentDeviceId = savedInstanceState.getInt(STATUS_CURRENT_DEVICE_ID)
+        }
+
+        val dialog = AlertDialog.Builder(context!!)
+                .setTitle(R.string.dialog_enable_folder_sync_for_new_device_title)
+                .setMessage(R.string.dialog_enable_folder_sync_for_new_device_text)
+                .setPositiveButton(R.string.dialog_enable_folder_sync_for_new_device_positive, null)
+                .setNegativeButton(R.string.dialog_enable_folder_sync_for_new_device_negative, null)
+                .create()
+
+        fun bindDeviceId() {
+            if (currentDeviceId >= devices.size) {
+                dismissAllowingStateLoss()
+            } else {
+                val device = devices[currentDeviceId]
+
+                dialog.setMessage(getString(
+                        R.string.dialog_enable_folder_sync_for_new_device_text,
+                        folderName,
+                        device.name,
+                        device.deviceId.deviceId
+                ))
+
+                dialog.getButton(AlertDialog.BUTTON_POSITIVE).setOnClickListener {
+                    GlobalScope.launch {
+                        libraryHandler.libraryManager.withLibrary {
+                            val oldFolderEntry = it.configuration.folders.find { it.folderId == folderId }!!
+
+                            it.configuration.update { oldConfig ->
+                                oldConfig.copy(
+                                        folders = oldConfig.folders.filter { it != oldFolderEntry }.toSet() + setOf(
+                                                oldFolderEntry.copy(
+                                                        deviceIdWhitelist = oldFolderEntry.deviceIdWhitelist + setOf(device.deviceId),
+                                                        deviceIdBlacklist = oldFolderEntry.deviceIdBlacklist - setOf(device.deviceId)
+                                                )
+                                        )
+                                )
+                            }
+
+                            it.syncthingClient.reconnect(device.deviceId)
+                            it.configuration.persistLater()
+                        }
+                    }
+
+                    currentDeviceId++
+                    bindDeviceId()
+                }
+
+                dialog.getButton(AlertDialog.BUTTON_NEGATIVE).setOnClickListener {
+                    GlobalScope.launch {
+                        libraryHandler.libraryManager.withLibrary {
+                            val oldFolderEntry = it.configuration.folders.find { it.folderId == folderId }!!
+
+                            it.configuration.update { oldConfig ->
+                                oldConfig.copy(
+                                        folders = oldConfig.folders.filter { it != oldFolderEntry }.toSet() + setOf(
+                                                oldFolderEntry.copy(
+                                                        ignoredDeviceIdList = oldFolderEntry.deviceIdWhitelist + setOf(device.deviceId)
+                                                )
+                                        )
+                                )
+                            }
+
+                            it.syncthingClient.reconnect(device.deviceId)
+                            it.configuration.persistLater()
+                        }
+                    }
+
+                    currentDeviceId++
+                    bindDeviceId()
+                }
+            }
+        }
+
+        dialog.setOnShowListener { bindDeviceId() }
+
+        return dialog
+    }
+
+    override fun onSaveInstanceState(outState: Bundle) {
+        super.onSaveInstanceState(outState)
+
+        outState.putInt(STATUS_CURRENT_DEVICE_ID, currentDeviceId)
+    }
+
+    fun show(fragmentManager: FragmentManager) = show(fragmentManager, TAG)
+}

app/src/main/kotlin/net/syncthing/lite/dialogs/ErrorReportDialog.kt

@@ -0,0 +1,52 @@
+package net.syncthing.lite.dialogs
+
+import android.app.Dialog
+import android.content.ClipData
+import android.content.ClipboardManager
+import android.content.Context
+import android.os.Bundle
+import android.support.v4.app.DialogFragment
+import android.support.v4.app.FragmentManager
+import android.support.v7.app.AlertDialog
+import android.widget.Toast
+import net.syncthing.lite.R
+
+class ErrorReportDialog: DialogFragment() {
+    companion object {
+        private const val REPORT = "report"
+        private const val TAG = "ErrorReportDialog"
+
+        fun newInstance(report: String) = ErrorReportDialog().apply {
+            arguments = Bundle().apply {
+                putString(REPORT, report)
+            }
+        }
+    }
+
+    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
+        val report = arguments!!.getString(REPORT)
+        val clipboard = context!!.getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager
+
+        return AlertDialog.Builder(context!!)
+                .setTitle(R.string.settings_last_error_title)
+                .setMessage(report)
+                .setPositiveButton(android.R.string.ok, null)
+                .setNeutralButton(R.string.copy_to_clipboard, null)
+                .create()
+                .apply {
+                    setOnShowListener {
+                        getButton(AlertDialog.BUTTON_NEUTRAL).setOnClickListener {
+                            clipboard.primaryClip = ClipData.newPlainText(
+                                    context!!.getString(R.string.settings_last_error_title),
+                                    report
+                            )
+
+                            Toast.makeText(context, context!!.getString(R.string.copied_to_clipboard), Toast.LENGTH_SHORT)
+                                    .show()
+                        }
+                    }
+                }
+    }
+
+    fun show(fragmentManager: FragmentManager) = show(fragmentManager, TAG)
+}

app/src/main/kotlin/net/syncthing/lite/dialogs/FileMenuDialogFragment.kt

@@ -8,12 +8,11 @@ import android.support.v4.app.FragmentManager
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
-import android.webkit.MimeTypeMap
 import net.syncthing.java.core.beans.FileInfo
 import net.syncthing.lite.databinding.DialogFileBinding
 import net.syncthing.lite.dialogs.downloadfile.DownloadFileDialogFragment
 import net.syncthing.lite.dialogs.downloadfile.DownloadFileSpec
-import org.apache.commons.io.FilenameUtils
+import net.syncthing.lite.utils.MimeType
 
 class FileMenuDialogFragment: BottomSheetDialogFragment() {
     companion object {
@@ -48,9 +47,7 @@ class FileMenuDialogFragment: BottomSheetDialogFragment() {
                     Intent(Intent.ACTION_CREATE_DOCUMENT).apply {
                         addCategory(Intent.CATEGORY_OPENABLE)
 
-                        type = MimeTypeMap.getSingleton().getMimeTypeFromExtension(
-                                FilenameUtils.getExtension(fileSpec.fileName)
-                        )
+                        type = MimeType.getFromUrl(fileSpec.fileName)
 
                         putExtra(Intent.EXTRA_TITLE, fileSpec.fileName)
                     },

app/src/main/kotlin/net/syncthing/lite/dialogs/FolderInfoDialog.kt

@@ -0,0 +1,105 @@
+package net.syncthing.lite.dialogs
+
+import android.app.Dialog
+import android.os.Bundle
+import android.support.v4.app.FragmentManager
+import android.support.v7.app.AlertDialog
+import android.support.v7.widget.AppCompatCheckBox
+import android.view.LayoutInflater
+import kotlinx.coroutines.launch
+import net.syncthing.lite.R
+import net.syncthing.lite.databinding.DialogFolderInfoBinding
+import net.syncthing.lite.fragments.SyncthingDialogFragment
+
+class FolderInfoDialog: SyncthingDialogFragment() {
+    companion object {
+        fun newInstance(folderId: String) = FolderInfoDialog().apply {
+            arguments = Bundle().apply {
+                putString(FOLDER_ID, folderId)
+            }
+        }
+
+        private const val FOLDER_ID = "folderId"
+        private const val TAG = "FolderInfoDialog"
+    }
+
+    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
+        val folderId = arguments!!.getString(FOLDER_ID)
+        val binding = DialogFolderInfoBinding.inflate(LayoutInflater.from(context))
+
+        val dialog = AlertDialog.Builder(context!!)
+                .setTitle(folderId)
+                .setView(binding.root)
+                .create()
+
+        launch {
+            val configuration = libraryHandler.libraryManager.withLibrary { it.configuration }
+
+            val folderInfo = configuration.folders.find { it.folderId == folderId }
+
+            if (folderInfo == null) {
+                dismissAllowingStateLoss()
+                return@launch
+            }
+
+            dialog.setTitle(folderInfo.label)
+
+            binding.deviceCheckboxesContainer.removeAllViews()
+
+            val allRelatedDevices = (folderInfo.deviceIdWhitelist + folderInfo.deviceIdBlacklist).toSet()
+
+            allRelatedDevices.forEach { deviceId ->
+                val deviceInfo = configuration.peers.find { it.deviceId == deviceId }
+
+                val deviceLabel = if (deviceInfo == null)
+                    deviceId.deviceId
+                else
+                    context!!.getString(R.string.dialog_folder_info_device_list_item, deviceInfo.name, deviceId.deviceId)
+
+                binding.deviceCheckboxesContainer.addView(
+                        AppCompatCheckBox(context!!).apply {
+                            text = deviceLabel
+                            isChecked = folderInfo.deviceIdWhitelist.contains(deviceId)
+
+                            setOnCheckedChangeListener { _, isShared ->
+                                this@FolderInfoDialog.launch {
+                                    libraryHandler.libraryManager.withLibrary { library ->
+                                        // update the config
+                                        library.configuration.update { oldConfig ->
+                                            val oldFolders = oldConfig.folders
+                                            var folderToChange = oldFolders.find { it.folderId == folderId }!!
+                                            val foldersNotToChange = oldFolders.filterNot { it.folderId == folderId }.toSet()
+
+                                            if (isShared) {
+                                                folderToChange = folderToChange.copy(
+                                                        ignoredDeviceIdList = folderToChange.ignoredDeviceIdList.filterNot { it == deviceId }.toSet(),
+                                                        deviceIdBlacklist = folderToChange.deviceIdBlacklist.filterNot { it == deviceId }.toSet(),
+                                                        deviceIdWhitelist = folderToChange.deviceIdWhitelist + setOf(deviceId)
+                                                )
+                                            } else {
+                                                folderToChange = folderToChange.copy(
+                                                        deviceIdWhitelist = folderToChange.deviceIdWhitelist.filterNot { it == deviceId }.toSet(),
+                                                        deviceIdBlacklist = folderToChange.deviceIdBlacklist + setOf(deviceId),
+                                                        ignoredDeviceIdList = folderToChange.ignoredDeviceIdList + setOf(deviceId)
+                                                )
+                                            }
+
+                                            oldConfig.copy(folders = foldersNotToChange + folderToChange)
+                                        }
+                                        library.configuration.persistLater()
+
+                                        // apply the change
+                                        library.syncthingClient.reconnect(deviceId)
+                                    }
+                                }
+                            }
+                        }
+                )
+            }
+        }
+
+        return dialog
+    }
+
+    fun show(fragmentManager: FragmentManager) = show(fragmentManager, TAG)
+}

app/src/main/kotlin/net/syncthing/lite/dialogs/downloadfile/DownloadFileDialogFragment.kt

@@ -12,13 +12,12 @@ import android.os.Bundle
 import android.support.v4.app.DialogFragment
 import android.support.v4.app.FragmentManager
 import android.util.Log
-import android.webkit.MimeTypeMap
 import net.syncthing.java.core.beans.FileInfo
 import net.syncthing.lite.BuildConfig
 import net.syncthing.lite.R
 import net.syncthing.lite.library.CacheFileProviderUrl
 import net.syncthing.lite.library.LibraryHandler
-import org.apache.commons.io.FilenameUtils
+import net.syncthing.lite.utils.MimeType
 import org.jetbrains.anko.newTask
 import org.jetbrains.anko.toast
 
@@ -89,7 +88,7 @@ class DownloadFileDialogFragment : DialogFragment() {
                     dismissAllowingStateLoss()
 
                     if (outputUri == null) {
-                        val mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension(FilenameUtils.getExtension(fileSpec.fileName))
+                        val mimeType = MimeType.getFromUrl(fileSpec.fileName)
 
                         try {
                             context!!.startActivity(

app/src/main/kotlin/net/syncthing/lite/error/ErrorStorage.kt

@@ -0,0 +1,17 @@
+package net.syncthing.lite.error
+
+import android.content.Context
+import org.jetbrains.anko.defaultSharedPreferences
+
+object ErrorStorage {
+    private const val PREF_KEY = "last_error"
+
+    fun reportError(context: Context, error: String) {
+        // this uses commit because the App could be quit directly after that
+        context.defaultSharedPreferences.edit()
+                .putString(PREF_KEY, error)
+                .commit()
+    }
+
+    fun getLastErrorReport(context: Context) = context.defaultSharedPreferences.getString(PREF_KEY, "there is no saved report")
+}

app/src/main/kotlin/net/syncthing/lite/fragments/DevicesFragment.kt

@@ -10,9 +10,9 @@ import android.view.View
 import android.view.ViewGroup
 import android.view.inputmethod.InputMethodManager
 import com.google.zxing.integration.android.IntentIntegrator
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.channels.consumeEach
 import kotlinx.coroutines.launch
+import net.syncthing.java.bep.connectionactor.ConnectionInfo
 import net.syncthing.java.core.beans.DeviceInfo
 import net.syncthing.lite.R
 import net.syncthing.lite.adapters.DeviceAdapterListener
@@ -34,25 +34,7 @@ class DevicesFragment : SyncthingFragment() {
                               savedInstanceState: Bundle?): View? {
         binding = DataBindingUtil.inflate(layoutInflater, R.layout.fragment_devices, container, false)
         binding.addDevice.setOnClickListener { showDialog() }
-        return binding.root
-    }
 
-    override fun onResume() {
-        super.onResume()
-        libraryHandler.syncthingClient { it.addOnConnectionChangedListener { _ -> updateDeviceList() } }
-    }
-
-    override fun onPause() {
-        super.onPause()
-        libraryHandler.syncthingClient { it.removeOnConnectionChangedListener{ _ -> updateDeviceList() } }
-    }
-
-    override fun onLibraryLoaded() {
-        initDeviceList()
-        updateDeviceList()
-    }
-
-    private fun initDeviceList() {
         binding.list.adapter = adapter
 
         adapter.listener = object: DeviceAdapterListener {
@@ -61,12 +43,21 @@ class DevicesFragment : SyncthingFragment() {
                         .setTitle(getString(R.string.remove_device_title, deviceInfo.name))
                         .setMessage(getString(R.string.remove_device_message, deviceInfo.deviceId.deviceId.substring(0, 7)))
                         .setPositiveButton(android.R.string.yes) { _, _ ->
-                            libraryHandler.library { config, syncthingClient, _ ->
-                                config.peers = config.peers.filterNot { it.deviceId == deviceInfo.deviceId }.toSet()
-                                config.persistLater()
-                                updateDeviceList()
+                            launch {
+                                libraryHandler.libraryManager.withLibrary { library ->
+                                    library.configuration.update { oldConfig ->
+                                        oldConfig.copy(
+                                                peers = oldConfig.peers
+                                                        .filterNot { it.deviceId == deviceInfo.deviceId }
+                                                        .toSet()
+                                        )
+                                    }
 
-                                syncthingClient.disconnectFromRemovedDevices()
+                                    library.configuration.persistLater()
+
+                                    // TODO: update the device list (should become a side effect of the call below)
+                                    library.syncthingClient.disconnectFromRemovedDevices()
+                                }
                             }
                         }
                         .setNegativeButton(android.R.string.no, null)
@@ -75,15 +66,17 @@ class DevicesFragment : SyncthingFragment() {
                 return false
             }
         }
-    }
 
-    private fun updateDeviceList() {
-        libraryHandler.syncthingClient { syncthingClient ->
-            GlobalScope.launch (Dispatchers.Main) {
-                adapter.data = syncthingClient.getPeerStatus()
-                binding.isEmpty = adapter.data.isEmpty()
+        launch {
+            libraryHandler.subscribeToConnectionStatus().consumeEach { connectionInfo ->
+                val devices = libraryHandler.libraryManager.withLibrary { it.configuration.peers }
+
+                adapter.data = devices.map { device -> device to (connectionInfo[device.deviceId] ?: ConnectionInfo.empty) }
+                binding.isEmpty = devices.isEmpty()
             }
         }
+
+        return binding.root
     }
 
     override fun onActivityResult(requestCode: Int, resultCode: Int, intent: Intent?) {
@@ -94,35 +87,38 @@ class DevicesFragment : SyncthingFragment() {
     }
 
     private fun showDialog() {
-        addDeviceDialogBinding = DataBindingUtil.inflate(LayoutInflater.from(context), R.layout.view_enter_device_id, null, false)
-        addDeviceDialogBinding?.let { binding ->
-            binding.scanQrCode.setOnClickListener {
-                FragmentIntentIntegrator(this@DevicesFragment).initiateScan()
-            }
-            binding.deviceId.post {
-                val imm = context!!.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
-                imm.showSoftInput(binding.deviceId, InputMethodManager.SHOW_IMPLICIT)
-            }
+        val binding = ViewEnterDeviceIdBinding.inflate(LayoutInflater.from(context), null, false)
+        addDeviceDialogBinding = binding
 
-            addDeviceDialog = AlertDialog.Builder(context)
-                    .setTitle(R.string.device_id_dialog_title)
-                    .setView(binding.root)
-                    .setPositiveButton(android.R.string.ok, null)
-                    .setNegativeButton(android.R.string.cancel, null)
-                    .show()
-
-            // Use different listener to keep dialog open after button click.
-            // https://stackoverflow.com/a/15619098
-            addDeviceDialog?.getButton(AlertDialog.BUTTON_POSITIVE)
-                    ?.setOnClickListener {
-                        try {
-                            val deviceId = binding.deviceId.text.toString()
-                            Util.importDeviceId(libraryHandler, context, deviceId, { updateDeviceList() })
-                            addDeviceDialog?.dismiss()
-                        } catch (e: IOException) {
-                            binding.deviceId.error = getString(R.string.invalid_device_id)
-                        }
-                    }
+        binding.scanQrCode.setOnClickListener {
+            FragmentIntentIntegrator(this@DevicesFragment).initiateScan()
         }
+        binding.deviceId.post {
+            val imm = context!!.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
+            imm.showSoftInput(binding.deviceId, InputMethodManager.SHOW_IMPLICIT)
+        }
+
+        val dialog = AlertDialog.Builder(context)
+                .setTitle(R.string.device_id_dialog_title)
+                .setView(binding.root)
+                .setPositiveButton(android.R.string.ok, null)
+                .setNegativeButton(android.R.string.cancel, null)
+                .show()
+
+        addDeviceDialog = dialog
+
+        fun handleAddClick() {
+            try {
+                val deviceId = binding.deviceId.text.toString()
+                Util.importDeviceId(libraryHandler.libraryManager, context!!, deviceId, { /* TODO: Is updateDeviceList() still required? */ })
+                dialog.dismiss()
+            } catch (e: IOException) {
+                binding.deviceId.error = getString(R.string.invalid_device_id)
+            }
+        }
+
+        // Use different listener to keep dialog open after button click.
+        // https://stackoverflow.com/a/15619098
+        dialog.getButton(AlertDialog.BUTTON_POSITIVE)!!.setOnClickListener { handleAddClick() }
     }
 }

app/src/main/kotlin/net/syncthing/lite/fragments/FoldersFragment.kt

@@ -2,12 +2,10 @@ package net.syncthing.lite.fragments
 
 import android.arch.lifecycle.Observer
 import android.os.Bundle
-import android.util.Log
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.channels.consumeEach
 import kotlinx.coroutines.launch
 import net.syncthing.java.core.beans.FolderInfo
 import net.syncthing.java.core.beans.FolderStats
@@ -15,52 +13,42 @@ import net.syncthing.lite.activities.FolderBrowserActivity
 import net.syncthing.lite.adapters.FolderListAdapterListener
 import net.syncthing.lite.adapters.FoldersListAdapter
 import net.syncthing.lite.databinding.FragmentFoldersBinding
+import net.syncthing.lite.dialogs.FolderInfoDialog
 import org.jetbrains.anko.intentFor
 
 class FoldersFragment : SyncthingFragment() {
+    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
+        val adapter = FoldersListAdapter()
 
-    private val TAG = "FoldersFragment"
+        adapter.listener = object : FolderListAdapterListener {
+            override fun onFolderClicked(folderInfo: FolderInfo, folderStats: FolderStats) {
+                startActivity(
+                        activity!!.intentFor<FolderBrowserActivity>(
+                                FolderBrowserActivity.EXTRA_FOLDER_NAME to folderInfo.folderId
+                        )
+                )
+            }
 
-    private lateinit var binding: FragmentFoldersBinding
+            override fun onFolderLongClicked(folderInfo: FolderInfo): Boolean {
+                FolderInfoDialog
+                        .newInstance(folderId = folderInfo.folderId)
+                        .show(fragmentManager!!)
 
-    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
-                              savedInstanceState: Bundle?): View? {
-        binding = FragmentFoldersBinding.inflate(layoutInflater, container, false)
+                return true
+            }
+        }
 
+        val binding = FragmentFoldersBinding.inflate(layoutInflater, container, false)
+        binding.list.adapter = adapter
         libraryHandler.isListeningPortTaken.observe(this, Observer { binding.listeningPortTaken = it })
 
+        launch {
+            libraryHandler.subscribeToFolderStatusList().consumeEach {
+                adapter.data = it
+                binding.isEmpty = it.isEmpty()
+            }
+        }
+
         return binding.root
     }
-
-    override fun onLibraryLoaded() {
-        showAllFoldersListView()
-    }
-
-    private fun showAllFoldersListView() {
-        libraryHandler.folderBrowser { folderBrowser ->
-            val list = folderBrowser.folderInfoAndStatsList()
-
-            GlobalScope.launch (Dispatchers.Main) {
-                Log.i(TAG, "list folders = " + list + " (" + list.size + " records)")
-                val adapter = FoldersListAdapter().apply { data = list }
-                binding.list.adapter = adapter
-                adapter.listener = object : FolderListAdapterListener {
-                    override fun onFolderClicked(folderInfo: FolderInfo, folderStats: FolderStats) {
-                        startActivity(
-                                activity!!.intentFor<FolderBrowserActivity>(
-                                        FolderBrowserActivity.EXTRA_FOLDER_NAME to folderInfo.folderId
-                                )
-                        )
-                    }
-                }
-
-                binding.isEmpty = list.isEmpty()
-            }
-        }
-    }
-
-    override fun onIndexUpdateComplete(folderInfo: FolderInfo) {
-        super.onIndexUpdateComplete(folderInfo)
-        showAllFoldersListView()
-    }
 }

app/src/main/kotlin/net/syncthing/lite/fragments/SettingsFragment.kt

@@ -1,10 +1,17 @@
 package net.syncthing.lite.fragments
 
+import android.content.Intent
+import android.net.Uri
 import android.os.Bundle
 import android.support.v7.preference.EditTextPreference
 import android.support.v7.preference.PreferenceFragmentCompat
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.launch
 import net.syncthing.lite.R
-import net.syncthing.lite.activities.SyncthingActivity
+import net.syncthing.lite.dialogs.ErrorReportDialog
+import net.syncthing.lite.error.ErrorStorage
+import net.syncthing.lite.library.DefaultLibraryManager
 
 class SettingsFragment : PreferenceFragmentCompat() {
 
@@ -13,19 +20,48 @@ class SettingsFragment : PreferenceFragmentCompat() {
 
         val localDeviceName = findPreference("local_device_name") as EditTextPreference
         val appVersion      = findPreference("app_version")
+        val forceStop       = findPreference("force_stop")
+        val lastCrash       = findPreference("last_crash")
+        val reportBug       = findPreference("report_bug")
+        val libraryManager  = DefaultLibraryManager.with(context!!)
 
-        (activity as SyncthingActivity?)?.let { activity ->
-            val versionName = activity.packageManager.getPackageInfo(activity.packageName, 0)?.versionName
-            appVersion.summary = versionName
-
-            activity.libraryHandler.configuration { localDeviceName.text = it.localDeviceName }
-            localDeviceName.setOnPreferenceChangeListener { _, _ ->
-                activity.libraryHandler.configuration { conf ->
-                    conf.localDeviceName = localDeviceName.text
-                    conf.persistLater()
-                }
-                true
+        GlobalScope.launch (Dispatchers.Main) {
+            libraryManager.withLibrary { library ->
+                localDeviceName.text = library.configuration.localDeviceName
             }
         }
+
+        appVersion.summary = context!!.packageManager.getPackageInfo(context!!.packageName, 0)?.versionName
+
+        localDeviceName.setOnPreferenceChangeListener { _, _ ->
+            val newDeviceName = localDeviceName.text
+
+            GlobalScope.launch {
+                libraryManager.withLibrary { library ->
+                    library.configuration.update { it.copy(localDeviceName = newDeviceName) }
+                    library.configuration.persistLater()
+                }
+            }
+
+            true
+        }
+
+        forceStop.setOnPreferenceClickListener {
+            System.exit(0)
+
+            true
+        }
+
+        lastCrash.setOnPreferenceClickListener {
+            ErrorReportDialog.newInstance(ErrorStorage.getLastErrorReport(context!!)).show(fragmentManager!!)
+
+            true
+        }
+
+        reportBug.setOnPreferenceClickListener {
+            startActivity(Intent(Intent.ACTION_VIEW, Uri.parse("https://github.com/syncthing/syncthing-lite/issues")))
+
+            true
+        }
     }
 }

app/src/main/kotlin/net/syncthing/lite/fragments/SyncthingDialogFragment.kt

@@ -1,9 +1,9 @@
 package net.syncthing.lite.fragments
 
-import android.support.v4.app.DialogFragment
+import net.syncthing.lite.async.CoroutineDialogFragment
 import net.syncthing.lite.library.LibraryHandler
 
-abstract class SyncthingDialogFragment : DialogFragment() {
+abstract class SyncthingDialogFragment : CoroutineDialogFragment() {
     val libraryHandler: LibraryHandler by lazy { LibraryHandler(
             context = context!!
     )}

app/src/main/kotlin/net/syncthing/lite/fragments/SyncthingFragment.kt

@@ -1,15 +1,10 @@
 package net.syncthing.lite.fragments
 
-import android.support.v4.app.Fragment
-import net.syncthing.java.core.beans.FolderInfo
+import net.syncthing.lite.async.CoroutineFragment
 import net.syncthing.lite.library.LibraryHandler
 
-abstract class SyncthingFragment : Fragment() {
-    val libraryHandler: LibraryHandler by lazy { LibraryHandler(
-            context = context!!,
-            onIndexUpdateProgressListener = this::onIndexUpdateProgress,
-            onIndexUpdateCompleteListener = this::onIndexUpdateComplete
-    )}
+abstract class SyncthingFragment : CoroutineFragment() {
+    val libraryHandler: LibraryHandler by lazy { LibraryHandler(context = context!!)}
 
     override fun onStart() {
         super.onStart()
@@ -27,8 +22,4 @@ abstract class SyncthingFragment : Fragment() {
     }
 
     open fun onLibraryLoaded() {}
-
-    open fun onIndexUpdateProgress(folderInfo: FolderInfo, percentage: Int) {}
-
-    open fun onIndexUpdateComplete(folderInfo: FolderInfo) {}
-}
+}

app/src/main/kotlin/net/syncthing/lite/library/DefaultLibraryManager.kt

@@ -4,8 +4,10 @@ import android.content.Context
 import android.os.Handler
 import android.os.Looper
 import android.util.Log
+import android.widget.Toast
 import net.syncthing.lite.BuildConfig
 import net.syncthing.lite.R
+import net.syncthing.lite.error.ErrorStorage
 import org.jetbrains.anko.defaultSharedPreferences
 
 object DefaultLibraryManager {
@@ -39,7 +41,16 @@ object DefaultLibraryManager {
                     }
 
                     instance = LibraryManager(
-                            synchronousInstanceCreator = { LibraryInstance(context) },
+                            synchronousInstanceCreator = {
+                                LibraryInstance(context) { ex ->
+                                    // this delay ensures that the toast is shown even if the UI thread is busy
+                                    handler.postDelayed({
+                                        Toast.makeText(context, R.string.toast_error, Toast.LENGTH_LONG).show()
+                                    }, 100L)
+
+                                    ErrorStorage.reportError(context, "${ex.component}\n${ex.detailsReadableString}\n${Log.getStackTraceString(ex.exception)}")
+                                }
+                            },
                             userCounterListener = {
                                 newUserCounter ->
 

app/src/main/kotlin/net/syncthing/lite/library/LibraryHandler.kt

@@ -5,16 +5,18 @@ import android.arch.lifecycle.MutableLiveData
 import android.content.Context
 import android.os.Handler
 import android.os.Looper
-import android.util.Log
-import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.channels.BroadcastChannel
+import kotlinx.coroutines.channels.Channel
+import kotlinx.coroutines.channels.ConflatedBroadcastChannel
+import kotlinx.coroutines.channels.consumeEach
 import kotlinx.coroutines.launch
-import net.syncthing.java.bep.FolderBrowser
+import net.syncthing.java.bep.connectionactor.ConnectionInfo
+import net.syncthing.java.bep.folder.FolderBrowser
+import net.syncthing.java.bep.folder.FolderStatus
 import net.syncthing.java.client.SyncthingClient
 import net.syncthing.java.core.beans.DeviceId
-import net.syncthing.java.core.beans.FileInfo
-import net.syncthing.java.core.beans.FolderInfo
-import net.syncthing.java.core.beans.IndexInfo
 import net.syncthing.java.core.configuration.Configuration
 import org.jetbrains.anko.doAsync
 import java.util.concurrent.atomic.AtomicBoolean
@@ -25,18 +27,20 @@ import java.util.concurrent.atomic.AtomicBoolean
  *
  * It's possible to do multiple start and stop cycles with one instance of this class.
  */
-class LibraryHandler(context: Context,
-                     private val onIndexUpdateProgressListener: (FolderInfo, Int) -> Unit = {_, _ -> },
-                     private val onIndexUpdateCompleteListener: (FolderInfo) -> Unit = {}) {
+class LibraryHandler(context: Context) {
 
     companion object {
         private const val TAG = "LibraryHandler"
         private val handler = Handler(Looper.getMainLooper())
     }
 
-    private val libraryManager = DefaultLibraryManager.with(context)
+    val libraryManager = DefaultLibraryManager.with(context)
     private val isStarted = AtomicBoolean(false)
     private val isListeningPortTakenInternal = MutableLiveData<Boolean>().apply { postValue(false) }
+    private val indexUpdateCompleteMessages = BroadcastChannel<String>(capacity = 16)
+    private val folderStatusList = BroadcastChannel<List<FolderStatus>>(capacity = Channel.CONFLATED)
+    private val connectionStatus = ConflatedBroadcastChannel<Map<DeviceId, ConnectionInfo>>()
+    private var job: Job = Job()
 
     val isListeningPortTaken: LiveData<Boolean> = isListeningPortTakenInternal
 
@@ -62,9 +66,27 @@ class LibraryHandler(context: Context,
 
             val client = libraryInstance.syncthingClient
 
-            client.indexHandler.registerOnIndexRecordAcquiredListener(this::onIndexRecordAcquired)
-            client.indexHandler.registerOnFullIndexAcquiredListenersListener(this::onRemoteIndexAcquired)
             client.discoveryHandler.registerMessageFromUnknownDeviceListener(internalMessageFromUnknownDeviceListener)
+
+            job = Job()
+
+            GlobalScope.launch (job) {
+                libraryInstance.syncthingClient.indexHandler.subscribeToOnFullIndexAcquiredEvents().consumeEach {
+                    indexUpdateCompleteMessages.send(it)
+                }
+            }
+
+            GlobalScope.launch (job) {
+                libraryInstance.folderBrowser.folderInfoAndStatusStream().consumeEach {
+                    folderStatusList.send(it)
+                }
+            }
+
+            GlobalScope.launch (job) {
+                libraryInstance.syncthingClient.subscribeToConnectionStatus().consumeEach {
+                    connectionStatus.send(it)
+                }
+            }
         }
     }
 
@@ -73,10 +95,10 @@ class LibraryHandler(context: Context,
             throw IllegalStateException("already stopped")
         }
 
+        job!!.cancel()
+
         syncthingClient {
             try {
-                it.indexHandler.unregisterOnIndexRecordAcquiredListener(this::onIndexRecordAcquired)
-                it.indexHandler.unregisterOnFullIndexAcquiredListenersListener(this::onRemoteIndexAcquired)
                 it.discoveryHandler.unregisterMessageFromUnknownDeviceListener(internalMessageFromUnknownDeviceListener)
             } catch (e: IllegalArgumentException) {
                 // ignored, no idea why this is thrown
@@ -86,22 +108,6 @@ class LibraryHandler(context: Context,
         libraryManager.stopLibraryUsage()
     }
 
-    private fun onIndexRecordAcquired(folderInfo: FolderInfo, newRecords: List<FileInfo>, indexInfo: IndexInfo) {
-        Log.i(TAG, "handleIndexRecordEvent trigger folder list update from index record acquired")
-
-        GlobalScope.launch (Dispatchers.Main) {
-            onIndexUpdateProgressListener(folderInfo, (indexInfo.getCompleted() * 100).toInt())
-        }
-    }
-
-    private fun onRemoteIndexAcquired(folderInfo: FolderInfo) {
-        Log.i(TAG, "handleIndexAcquiredEvent trigger folder list update from index acquired")
-
-        GlobalScope.launch (Dispatchers.Main) {
-            onIndexUpdateCompleteListener(folderInfo)
-        }
-    }
-
     /*
      * The callback is executed asynchronously.
      * As soon as it returns, there is no guarantee about the availability of the library
@@ -139,4 +145,8 @@ class LibraryHandler(context: Context,
     fun unregisterMessageFromUnknownDeviceListener(listener: (DeviceId) -> Unit) {
         messageFromUnknownDeviceListeners.remove(listener)
     }
+
+    fun subscribeToOnFullIndexAcquiredEvents() = indexUpdateCompleteMessages.openSubscription()
+    fun subscribeToFolderStatusList() = folderStatusList.openSubscription()
+    fun subscribeToConnectionStatus() = connectionStatus.openSubscription()
 }

app/src/main/kotlin/net/syncthing/lite/library/LibraryInstance.kt

@@ -2,8 +2,13 @@ package net.syncthing.lite.library
 
 import android.content.Context
 import android.util.Log
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.launch
 import net.syncthing.java.client.SyncthingClient
 import net.syncthing.java.core.configuration.Configuration
+import net.syncthing.java.core.exception.ExceptionReport
+import net.syncthing.java.repository.EncryptedTempRepository
 import net.syncthing.repository.android.SqliteIndexRepository
 import net.syncthing.repository.android.TempDirectoryLocalRepository
 import net.syncthing.repository.android.database.RepositoryDatabase
@@ -21,7 +26,10 @@ import java.net.SocketException
  *
  * The creation and the shutdown are synchronous, so keep them out of the UI Thread
  */
-class LibraryInstance (context: Context) {
+class LibraryInstance (
+        context: Context,
+        private val exceptionReportHandler: (ExceptionReport) -> Unit
+) {
     companion object {
         private const val LOG_TAG = "LibraryInstance"
 
@@ -42,7 +50,11 @@ class LibraryInstance (context: Context) {
         }
     }
 
-    private val tempRepository = TempDirectoryLocalRepository(File(context.filesDir, "temp_repository"))
+    private val tempRepository = EncryptedTempRepository(
+            TempDirectoryLocalRepository(
+                    File(context.filesDir, "temp_repository")
+            )
+    )
 
     val isListeningPortTaken = checkIsListeningPortTaken()  // this must come first to work correctly
     val configuration = Configuration(configFolder = context.filesDir)
@@ -51,14 +63,21 @@ class LibraryInstance (context: Context) {
             repository = SqliteIndexRepository(
                     database = RepositoryDatabase.with(context),
                     closeDatabaseOnClose = false,
-                    clearTempStorageHook = { tempRepository.deleteAllData() }
+                    clearTempStorageHook = { tempRepository.deleteAllTempData() }
             ),
-            tempRepository = tempRepository
-    )
-    val folderBrowser = syncthingClient.indexHandler.newFolderBrowser()
+            tempRepository = tempRepository,
+            exceptionReportHandler = { ex ->
+                Log.w(LOG_TAG, "${ex.component}\n${ex.detailsReadableString}\n${Log.getStackTraceString(ex.exception)}")
 
-    fun shutdown() {
-        folderBrowser.close()
+                GlobalScope.launch (Dispatchers.Main) {
+                    exceptionReportHandler(ex)
+                }
+            }
+    )
+    val folderBrowser = syncthingClient.indexHandler.folderBrowser
+    val indexBrowser = syncthingClient.indexHandler.indexBrowser
+
+    suspend fun shutdown() {
         syncthingClient.close()
         configuration.persistNow()
     }

app/src/main/kotlin/net/syncthing/lite/library/LibraryManager.kt

@@ -2,6 +2,13 @@ package net.syncthing.lite.library
 
 import android.os.Handler
 import android.os.Looper
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.async
+import kotlinx.coroutines.channels.ConflatedBroadcastChannel
+import kotlinx.coroutines.channels.consumeEach
+import kotlinx.coroutines.channels.produce
+import kotlinx.coroutines.runBlocking
 import java.util.concurrent.Executors
 import kotlin.coroutines.resume
 import kotlin.coroutines.suspendCoroutine
@@ -35,7 +42,7 @@ class LibraryManager (
     // only this Thread should access instance and userCounter
     private val startStopExecutor = Executors.newSingleThreadExecutor()
 
-    private var instance: LibraryInstance? = null
+    private val instanceStream = ConflatedBroadcastChannel<LibraryInstance?>(null)
     private var userCounter = 0
 
     fun startLibraryUsage(callback: (LibraryInstance) -> Unit) {
@@ -43,12 +50,12 @@ class LibraryManager (
             val newUserCounter = ++userCounter
             handler.post { userCounterListener(newUserCounter) }
 
-            if (instance == null) {
-                instance = synchronousInstanceCreator()
+            if (instanceStream.value == null) {
+                instanceStream.offer(synchronousInstanceCreator())
                 handler.post { isRunningListener(true) }
             }
 
-            handler.post { callback(instance!!) }
+            handler.post { callback(instanceStream.value!!) }
         }
     }
 
@@ -60,6 +67,16 @@ class LibraryManager (
         }
     }
 
+    suspend fun <T> withLibrary(action: suspend (LibraryInstance) -> T): T {
+        val instance = startLibraryUsageCoroutine()
+
+        return try {
+            action(instance)
+        } finally {
+            stopLibraryUsage()
+        }
+    }
+
     fun stopLibraryUsage() {
         startStopExecutor.submit {
             val newUserCounter = --userCounter
@@ -77,8 +94,8 @@ class LibraryManager (
     fun shutdownIfThereAreZeroUsers(listener: (wasShutdownPerformed: Boolean) -> Unit = {}) {
         startStopExecutor.submit {
             if (userCounter == 0) {
-                instance?.shutdown()
-                instance = null
+                runBlocking { instanceStream.value?.shutdown() }
+                instanceStream.offer(null)
 
                 handler.post { isRunningListener(false) }
                 handler.post { listener(true) }
@@ -87,4 +104,21 @@ class LibraryManager (
             }
         }
     }
+
+    fun streamDirectoryListing(folder: String, path: String) = GlobalScope.produce {
+        var job = Job()
+
+        instanceStream.openSubscription().consumeEach { instance ->
+            job.cancel()
+            job = Job()
+
+            if (instance != null) {
+                async (job) {
+                    instance.indexBrowser.streamDirectoryListing(folder, path).consumeEach {
+                        send(it)
+                    }
+                }
+            }
+        }
+    }
 }

app/src/main/kotlin/net/syncthing/lite/library/SyncthingProvider.kt

@@ -10,33 +10,36 @@ import android.provider.DocumentsProvider
 import android.util.Log
 import kotlinx.coroutines.cancel
 import kotlinx.coroutines.runBlocking
-import net.syncthing.java.bep.IndexBrowser
+import net.syncthing.java.bep.index.browser.DirectoryContentListing
+import net.syncthing.java.bep.index.browser.DirectoryNotFoundListing
 import net.syncthing.java.core.beans.FileInfo
 import net.syncthing.java.core.beans.FolderInfo
-import net.syncthing.java.core.beans.FolderStats
 import net.syncthing.lite.R
+import net.syncthing.lite.utils.MimeType
 import java.io.FileNotFoundException
-import java.net.URLConnection
-import java.util.concurrent.CountDownLatch
 
 class SyncthingProvider : DocumentsProvider() {
 
     companion object {
         private const val Tag = "SyncthingProvider"
+
         private val DefaultRootProjection = arrayOf(
                 Root.COLUMN_ROOT_ID,
                 Root.COLUMN_FLAGS,
                 Root.COLUMN_TITLE,
                 Root.COLUMN_SUMMARY,
                 Root.COLUMN_DOCUMENT_ID,
-                Root.COLUMN_ICON)
+                Root.COLUMN_ICON
+        )
+
         private val DefaultDocumentProjection = arrayOf(
                 Document.COLUMN_DOCUMENT_ID,
                 Document.COLUMN_DISPLAY_NAME,
                 Document.COLUMN_SIZE,
                 Document.COLUMN_MIME_TYPE,
                 Document.COLUMN_LAST_MODIFIED,
-                Document.COLUMN_FLAGS)
+                Document.COLUMN_FLAGS
+        )
     }
 
     override fun onCreate(): Boolean {
@@ -45,96 +48,122 @@ class SyncthingProvider : DocumentsProvider() {
     }
 
     // this instance is not started -> it connects and disconnects on demand
-    private val libraryHandler: LibraryHandler by lazy { LibraryHandler(context) }
     private val libraryManager: LibraryManager by lazy { DefaultLibraryManager.with(context) }
 
     override fun queryRoots(projection: Array<String>?): Cursor {
         Log.d(Tag, "queryRoots($projection)")
-        val latch = CountDownLatch(1)
-        var folders: List<Pair<FolderInfo, FolderStats>>? = null
-        libraryHandler.folderBrowser { folderBrowser ->
-            folders = folderBrowser.folderInfoAndStatsList()
-            latch.countDown()
-        }
-        latch.await()
 
-        val result = MatrixCursor(projection ?: DefaultRootProjection)
-        folders!!.forEach { folder ->
-            val row = result.newRow()
-            row.add(Root.COLUMN_ROOT_ID, folder.first.folderId)
-            row.add(Root.COLUMN_SUMMARY, folder.first.label)
-            row.add(Root.COLUMN_FLAGS, 0)
-            row.add(Root.COLUMN_TITLE, context.getString(R.string.app_name))
-            row.add(Root.COLUMN_DOCUMENT_ID, getDocIdForFile(folder.first))
-            row.add(Root.COLUMN_ICON, R.mipmap.ic_launcher)
+        return runBlocking {
+            libraryManager.withLibrary { instance ->
+                MatrixCursor(projection ?: DefaultRootProjection).apply {
+                    instance.folderBrowser.folderInfoAndStatusList().forEach { folder ->
+                        newRow().apply {
+                            add(Root.COLUMN_ROOT_ID, folder.info.folderId)
+                            add(Root.COLUMN_SUMMARY, folder.info.label)
+                            add(Root.COLUMN_FLAGS, 0)
+                            add(Root.COLUMN_TITLE, context.getString(R.string.app_name))
+                            add(Root.COLUMN_DOCUMENT_ID, getDocIdForFile(folder.info))
+                            add(Root.COLUMN_ICON, R.mipmap.ic_launcher)
+                        }
+                    }
+                }
+            }
         }
-        return result
     }
 
     override fun queryChildDocuments(parentDocumentId: String, projection: Array<String>?,
                                      sortOrder: String?): Cursor {
         Log.d(Tag, "queryChildDocuments($parentDocumentId, $projection, $sortOrder)")
-        val result = MatrixCursor(projection ?: DefaultDocumentProjection)
-        getIndexBrowser(getFolderIdForDocId(parentDocumentId))
-                .listFiles(getPathForDocId(parentDocumentId))
-                .forEach { fileInfo ->
-                    includeFile(result, fileInfo)
+
+        return runBlocking {
+            libraryManager.withLibrary { instance ->
+                val listing = instance.indexBrowser.getDirectoryListing(
+                        folder = getFolderIdForDocId(parentDocumentId),
+                        path = getPathForDocId(parentDocumentId)
+                )
+
+                when (listing) {
+                    is DirectoryNotFoundListing -> throw FileNotFoundException()
+                    is DirectoryContentListing -> {
+                        val result = MatrixCursor(projection ?: DefaultDocumentProjection)
+
+                        listing.entries.forEach { entry ->
+                            includeFile(result, entry)
+                        }
+
+                        result
+                    }
                 }
-        return result
+            }
+        }
     }
 
     override fun queryDocument(documentId: String, projection: Array<String>?): Cursor {
         Log.d(Tag, "queryDocument($documentId, $projection)")
-        val result = MatrixCursor(projection ?: DefaultDocumentProjection)
-        val fileInfo = getIndexBrowser(getFolderIdForDocId(documentId))
-                .getFileInfoByAbsolutePath(getPathForDocId(documentId))
-        includeFile(result, fileInfo)
-        return result
+
+        return runBlocking {
+            libraryManager.withLibrary {  instance ->
+                val fileInfo = instance.indexBrowser.getFileInfoByAbsolutePathAllowNull(
+                        folder = getFolderIdForDocId(documentId),
+                        path = getPathForDocId(documentId)
+                ) ?: throw FileNotFoundException()
+
+                MatrixCursor(projection ?: DefaultDocumentProjection).apply {
+                    includeFile(this, fileInfo)
+                }
+            }
+        }
     }
 
     @Throws(FileNotFoundException::class)
     override fun openDocument(documentId: String, mode: String, signal: CancellationSignal?):
             ParcelFileDescriptor {
         Log.d(Tag, "openDocument($documentId, $mode, $signal)")
-        val fileInfo = getIndexBrowser(getFolderIdForDocId(documentId))
-                .getFileInfoByAbsolutePath(getPathForDocId(documentId))
+
         val accessMode = ParcelFileDescriptor.parseMode(mode)
+
         if (accessMode != ParcelFileDescriptor.MODE_READ_ONLY) {
             throw NotImplementedError()
         }
 
-        val outputFile = runBlocking {
-            signal?.setOnCancelListener {
-                this.coroutineContext.cancel()
-            }
+        return runBlocking {
+            libraryManager.withLibrary { instance ->
+                val fileInfo = instance.indexBrowser.getFileInfoByAbsolutePathAllowNull(
+                        folder = getFolderIdForDocId(documentId),
+                        path = getPathForDocId(documentId)
+                ) ?: throw FileNotFoundException()
 
-            val libraryInstance = libraryManager.startLibraryUsageCoroutine()
+                signal?.setOnCancelListener {
+                    this.coroutineContext.cancel()
+                }
 
-            try {
-                DownloadFileTask.downloadFileCoroutine(
+                val outputFile = DownloadFileTask.downloadFileCoroutine(
                         externalCacheDir = context.externalCacheDir,
-                        syncthingClient = libraryInstance.syncthingClient,
+                        syncthingClient = instance.syncthingClient,
                         fileInfo = fileInfo,
                         onProgress = { /* ignore the progress */ }
                 )
-            } finally {
-                libraryManager.stopLibraryUsage()
+
+                ParcelFileDescriptor.open(outputFile, ParcelFileDescriptor.MODE_READ_ONLY)
             }
         }
-
-        return ParcelFileDescriptor.open(outputFile, ParcelFileDescriptor.MODE_READ_ONLY)
     }
 
     private fun includeFile(result: MatrixCursor, fileInfo: FileInfo) {
-        val row = result.newRow()
-        row.add(Document.COLUMN_DOCUMENT_ID, getDocIdForFile(fileInfo))
-        row.add(Document.COLUMN_DISPLAY_NAME, fileInfo.fileName)
-        row.add(Document.COLUMN_SIZE, fileInfo.size)
-        val mime = if (fileInfo.isDirectory()) Document.MIME_TYPE_DIR
-        else URLConnection.guessContentTypeFromName(fileInfo.fileName)
-        row.add(Document.COLUMN_MIME_TYPE, mime)
-        row.add(Document.COLUMN_LAST_MODIFIED, fileInfo.lastModified)
-        row.add(Document.COLUMN_FLAGS, 0)
+        result.newRow().apply {
+            add(Document.COLUMN_DOCUMENT_ID, getDocIdForFile(fileInfo))
+            add(Document.COLUMN_DISPLAY_NAME, fileInfo.fileName)
+            add(Document.COLUMN_SIZE, fileInfo.size)
+            add(
+                    Document.COLUMN_MIME_TYPE,
+                    if (fileInfo.isDirectory())
+                        Document.MIME_TYPE_DIR
+                    else
+                        MimeType.getFromUrl(fileInfo.fileName)
+            )
+            add(Document.COLUMN_LAST_MODIFIED, fileInfo.lastModified)
+            add(Document.COLUMN_FLAGS, 0)
+        }
     }
 
     private fun getFolderIdForDocId(docId: String) = docId.split(":")[0]
@@ -144,15 +173,4 @@ class SyncthingProvider : DocumentsProvider() {
     private fun getDocIdForFile(folderInfo: FolderInfo) = folderInfo.folderId + ":"
 
     private fun getDocIdForFile(fileInfo: FileInfo) = fileInfo.folder + ":" + fileInfo.path
-
-    private fun getIndexBrowser(folderId: String): IndexBrowser {
-        val latch = CountDownLatch(1)
-        var indexBrowser: IndexBrowser? = null
-        libraryHandler.syncthingClient {
-            indexBrowser = it.indexHandler.newIndexBrowser(folderId)
-            latch.countDown()
-        }
-        latch.await()
-        return indexBrowser!!
-    }
 }

app/src/main/kotlin/net/syncthing/lite/utils/MimeType.kt

@@ -0,0 +1,17 @@
+package net.syncthing.lite.utils
+
+import android.webkit.MimeTypeMap
+
+object MimeType {
+    private const val DEFAULT_MIME_TYPE = "application/octet-stream"
+
+    private fun getFromExtension(extension: String): String {
+        val mimeType: String? = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension)
+
+        return mimeType ?: DEFAULT_MIME_TYPE
+    }
+
+    fun getFromUrl(url: String) = getFromExtension(
+            MimeTypeMap.getFileExtensionFromUrl(url).toLowerCase()
+    )
+}

app/src/main/kotlin/net/syncthing/lite/utils/Util.kt

@@ -10,7 +10,7 @@ import kotlinx.coroutines.launch
 import net.syncthing.java.core.beans.DeviceId
 import net.syncthing.java.core.beans.DeviceInfo
 import net.syncthing.lite.R
-import net.syncthing.lite.library.LibraryHandler
+import net.syncthing.lite.library.LibraryManager
 import org.apache.commons.lang3.StringUtils.capitalize
 import org.jetbrains.anko.toast
 import java.io.IOException
@@ -23,11 +23,11 @@ object Util {
         val manufacturer = Build.MANUFACTURER ?: ""
         val model = Build.MODEL ?: ""
         val deviceName =
-            if (model.startsWith(manufacturer)) {
-                capitalize(model)
-            } else {
-                capitalize(manufacturer) + " " + model
-            }
+                if (model.startsWith(manufacturer)) {
+                    capitalize(model)
+                } else {
+                    capitalize(manufacturer) + " " + model
+                }
         return deviceName ?: "android"
     }
 
@@ -41,22 +41,34 @@ object Util {
     }
 
     @Throws(IOException::class)
-    fun importDeviceId(libraryHandler: LibraryHandler?, context: Context?, deviceId: String,
-                       onComplete: () -> Unit) {
-        val deviceId2 = DeviceId(deviceId.toUpperCase(Locale.US))
-        libraryHandler?.library { configuration, syncthingClient, _ ->
-            if (!configuration.peerIds.contains(deviceId2)) {
-                configuration.peers = configuration.peers + DeviceInfo(deviceId2, null)
-                configuration.persistLater()
-                syncthingClient.connectToNewlyAddedDevices()
-                GlobalScope.launch (Dispatchers.Main) {
-                    context?.toast(context.getString(R.string.device_import_success, deviceId2.shortId))
+    fun importDeviceId(libraryManager: LibraryManager, context: Context, deviceId: String, onComplete: () -> Unit) {
+        val newDeviceId = DeviceId(deviceId.toUpperCase(Locale.US))
+
+        GlobalScope.launch (Dispatchers.Main) {
+            libraryManager.withLibrary { library ->
+                val didAddDevice = library.configuration.update { oldConfig ->
+                    if (oldConfig.peers.find { it.deviceId == newDeviceId } != null) {
+                        // already known
+
+                        oldConfig
+                    } else {
+                        oldConfig.copy(
+                                peers = oldConfig.peers + DeviceInfo(newDeviceId, newDeviceId.shortId)
+                        )
+                    }
+                }
+
+                if (didAddDevice) {
+                    library.configuration.persistLater()
+                    library.syncthingClient.connectToNewlyAddedDevices()
+
+                    context.toast(context.getString(R.string.device_import_success, newDeviceId.shortId))
                     onComplete()
+                } else {
+                    context.toast(context.getString(R.string.device_already_known, newDeviceId.shortId))
                 }
-            } else {
-                GlobalScope.launch (Dispatchers.Main) {
-                    context?.toast(context.getString(R.string.device_already_known, deviceId2.shortId))
-                }
+
+                null
             }
         }
     }

app/src/main/play/en-GB/whatsnew

@@ -1,3 +1,7 @@
-- new connection handling
-- option for users to get detailed crash reports
-- bugfixes
+- update translations
+- encrypt some temporarily data which is stored on disk
+- update path validation
+- fix crash when cleaning the cache
+- fix crash of the index handler after cleaning the cache
+- convert file extensions to lower case for detecting Apps to open it
+- fix crash when accessing (e.g. trying to close) closed connections

app/src/main/res/layout/dialog_folder_info.xml

@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layout xmlns:android="http://schemas.android.com/apk/res/android">
+    <LinearLayout
+        android:padding="8dp"
+        android:orientation="vertical"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content">
+
+        <TextView
+            android:textAppearance="?android:textAppearanceMedium"
+            android:text="@string/dialog_folder_info_device_list"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content" />
+
+        <LinearLayout
+            android:id="@+id/device_checkboxes_container"
+            android:orientation="vertical"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content">
+
+            <!--
+            <CheckBox
+                android:text="Test device 1 (the very very very very very very very very very very very long id)"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content" />
+
+            <CheckBox
+                android:text="Test device 2 (the very very very very very very very very very very very long id)"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content" />
+            -->
+
+        </LinearLayout>
+
+    </LinearLayout>
+</layout>

app/src/main/res/layout/listview_device.xml

@@ -7,46 +7,59 @@
             name="name"
             type="String" />
 
+        <variable
+            name="status"
+            type="String" />
+
         <variable
             name="isConnected"
             type="Boolean" />
     </data>
 
-    <RelativeLayout
+    <LinearLayout
+        android:orientation="horizontal"
         android:background="?selectableItemBackground"
+        android:padding="8dp"
         android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:paddingBottom="12dp"
-        android:paddingLeft="24dp"
-        android:paddingRight="24dp"
-        android:paddingTop="12dp">
+        android:layout_height="wrap_content">
 
         <ImageView
+            android:layout_gravity="center_vertical"
             android:id="@+id/device_icon"
             android:layout_width="32dp"
             android:layout_height="32dp"
             tools:src="@drawable/ic_laptop_green_24dp"
-            android:src="@{safeUnbox(isConnected) ? @drawable/ic_laptop_green_24dp : @drawable/ic_laptop_red_24dp}"
-            android:layout_alignParentStart="true"
-            android:layout_alignParentTop="true"/>
+            android:src="@{safeUnbox(isConnected) ? @drawable/ic_laptop_green_24dp : @drawable/ic_laptop_red_24dp}" />
 
-        <TextView
-            tools:text="Computer"
-            android:text="@{name}"
-            android:id="@+id/device_name"
+        <View
+            android:layout_width="16dp"
+            android:layout_height="0dp" />
+
+        <LinearLayout
+            android:orientation="vertical"
             android:layout_width="match_parent"
-            android:layout_alignParentEnd="true"
-            android:layout_height="wrap_content"
-            android:ellipsize="end"
-            android:maxLines="1"
-            android:layout_alignParentTop="true"
-            android:gravity="top"
-            android:textAlignment="gravity"
-            android:paddingStart="40dp"
-            android:paddingEnd="40dp"
-            android:textSize="18sp"
-            android:textStyle="bold"/>
+            android:layout_height="wrap_content">
 
-    </RelativeLayout>
+            <TextView
+                tools:text="Computer"
+                android:text="@{name}"
+                android:id="@+id/device_name"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:ellipsize="end"
+                android:maxLines="1"
+                android:textAlignment="gravity"
+                android:textSize="18sp"
+                android:textStyle="bold"/>
+
+            <TextView
+                android:text="@{status}"
+                tools:text="Trying to connect to 127.0.0.1 ..."
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content" />
+
+        </LinearLayout>
+
+    </LinearLayout>
 
 </layout>

app/src/main/res/layout/listview_folder.xml

@@ -13,9 +13,17 @@
         <variable
             name="info"
             type="String" />
+
+        <variable
+            name="info2"
+            type="String" />
+
+        <import type="android.view.View" />
+        <import type="android.text.TextUtils" />
     </data>
 
-    <RelativeLayout
+    <LinearLayout
+        android:orientation="vertical"
         android:background="?selectableItemBackground"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
@@ -29,13 +37,9 @@
             android:text="@{folderName}"
             android:id="@+id/folder_name_view"
             android:layout_width="match_parent"
-            android:layout_alignParentEnd="true"
             android:layout_height="wrap_content"
             android:ellipsize="end"
             android:maxLines="1"
-            android:layout_alignParentTop="true"
-            android:gravity="top"
-            android:textAlignment="gravity"
             android:textSize="20sp"
             android:textStyle="bold"/>
 
@@ -47,9 +51,7 @@
             android:layout_height="wrap_content"
             android:ellipsize="end"
             android:maxLines="1"
-            android:layout_below="@id/folder_name_view"
-            android:textSize="14sp"
-            android:layout_alignParentStart="true" />
+            android:textSize="14sp" />
 
         <TextView
             tools:text="Additional information"
@@ -59,11 +61,18 @@
             android:layout_height="wrap_content"
             android:ellipsize="end"
             android:maxLines="1"
-            android:layout_below="@id/folder_lastmod_info"
-            android:textSize="14sp"
-            android:layout_alignParentStart="true"  />
+            android:textSize="14sp" />
 
+        <TextView
+            android:visibility="@{TextUtils.isEmpty(info2) ? View.GONE : View.VISIBLE}"
+            tools:text="Index Update Progress"
+            android:text="@{info2}"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:ellipsize="end"
+            android:maxLines="1"
+            android:textSize="14sp" />
 
-    </RelativeLayout>
+    </LinearLayout>
 
-</layout>
+</layout>

app/src/main/res/values-de/strings.xml

@@ -36,9 +36,33 @@
     <string name="intro_page_three_title">Ordner teilen</string>
     <string name="intro_page_two_description">Eine Syncthing Geräte ID eingeben oder QR Code einer Geräte ID scannen.</string>
     <string name="intro_page_three_description">Akzeptieren Sie nun das Gerät mit der ID %1$s und geben Sie einen Ordner mit ihm frei. Es kann einige Minuten dauern, bis sich die Geräte verbinden.</string>
+    <string name="intro_page_three_searching_device">Versuche das andere Gerät zu finden. Dies kann einen Moment dauern.</string>
     <string name="settings">Einstellungen</string>
     <string name="settings_app_version_title">App Version</string>
     <string name="settings_local_device_name">Lokaler Geräte Namen</string>
     <string name="settings_local_device_summary">Name, den das andere Gerät für dieses Gerät sehen wird</string>
+    <string name="settings_force_stop">Beenden dieser App erzwingen</string>
+    <string name="settings_last_error_title">Letzter Fehler</string>
+    <string name="settings_last_error_summary">Details des letzten Fehlers anzeigen</string>
+    <string name="settings_report_bug_title">Einen Fehler melden</string>
+    <string name="settings_report_bug_summary">Den Bugtracker bei GitHub für diese App öffnen</string>
+    <string name="copy_to_clipboard">In die Zwischenablage kopieren</string>
+    <string name="copied_to_clipboard">In die Zwischenablage kopiert</string>
     <string name="device_id_dialog_title">Geräte ID eingeben</string>
-    </resources>
+    <string name="dialog_warning_reconnect_problem">
+Aufgrund des Verhaltens dieser App und des Verhaltens des Syncthing-Servers können Sie sich für einige Minuten nicht verbinden, wenn die App erzwungen beendet wurde (durch das Entfernen aus der Liste der aktiven Apps) oder die Verbindung unterbrochen wurde.
+Dies gilt nicht für Verbindungen, die per lokaler Gerätesuche hergestellt wurden.</string>
+    <string name="dialog_file_save_as">Speichern unter</string>
+    <string name="pending_index_updates">%d Index-Updates verbleibend</string>
+    <string name="device_status_connecting">Verbinden mit %s</string>
+    <string name="device_status_connected">Mit %s verbunden</string>
+    <string name="device_status_disconnected">Verbinden wird bald erneut versucht - es sind %d Adressen bekannt</string>
+    <string name="device_status_no_address">Keine bekannte Adresse für dieses Gerät</string>
+    <string name="dialog_enable_folder_sync_for_new_device_title">Ordnersynchronisation für neues Gerät aktivieren</string>
+    <string name="dialog_enable_folder_sync_for_new_device_text">Möchten Sie den Ordner %1$s mit %2$s (%3$s) synchronisieren?</string>
+    <string name="dialog_enable_folder_sync_for_new_device_positive">synchronisieren</string>
+    <string name="dialog_enable_folder_sync_for_new_device_negative">nicht synchronisieren</string>
+    <string name="dialog_folder_info_device_list">Ordner teilen mit:</string>
+    <string name="dialog_folder_info_device_list_item">%1$s (%2$s)</string>
+    <string name="toast_error">Etwas in Syncthing Lite hat nicht funktioniert. Sie können die Details in den Einstellungen von Syncthing Lite anzeigen.</string>
+</resources>

app/src/main/res/values-es/strings.xml

@@ -49,4 +49,5 @@
     <string name="settings_shutdown_delay_30_seconds">30 segundos</string>
     <string name="settings_shutdown_delay_1_minute">1 minuto</string>
     <string name="settings_shutdown_delay_5_minutes">5 minutos</string>
-</resources>
+    <string name="dialog_folder_info_device_list_item">%1$s (%2$s)</string>
+    </resources>

app/src/main/res/values-fr/strings.xml

@@ -47,4 +47,5 @@
     <string name="settings_shutdown_delay_30_seconds">30 secondes</string>
     <string name="settings_shutdown_delay_1_minute">1 minute</string>
     <string name="settings_shutdown_delay_5_minutes">5 minutes</string>
-</resources>
+    <string name="dialog_folder_info_device_list_item">%1$s (%2$s)</string>
+    </resources>

app/src/main/res/values-hu/strings.xml

@@ -47,4 +47,5 @@
     <string name="settings_shutdown_delay_30_seconds">30 másodperc</string>
     <string name="settings_shutdown_delay_1_minute">1 perc</string>
     <string name="settings_shutdown_delay_5_minutes">5 perc</string>
-</resources>
+    <string name="dialog_folder_info_device_list_item">%1$s (%2$s)</string>
+    </resources>

app/src/main/res/values-it/strings.xml

@@ -47,4 +47,5 @@
     <string name="settings_shutdown_delay_30_seconds">30 secondi</string>
     <string name="settings_shutdown_delay_1_minute">1 minuto</string>
     <string name="settings_shutdown_delay_5_minutes">5 minuti</string>
-</resources>
+    <string name="dialog_folder_info_device_list_item">%1$s (%2$s)</string>
+    </resources>

app/src/main/res/values-ja/strings.xml

@@ -41,4 +41,5 @@
     <string name="settings_local_device_name">ローカルのデバイス名</string>
     <string name="settings_local_device_summary">他のデバイスがこのデバイスを表示する名前</string>
     <string name="device_id_dialog_title">デバイス ID を入力</string>
+    <string name="dialog_folder_info_device_list_item">%1$s (%2$s)</string>
     </resources>

app/src/main/res/values-nl-rBE/strings.xml

@@ -41,4 +41,5 @@
     <string name="settings_local_device_name">Naam van lokaal apparaat</string>
     <string name="settings_local_device_summary">De naam die dat andere apparaten voor dit apparaat gaan zien</string>
     <string name="device_id_dialog_title">Voert nen apparaats-ID in</string>
+    <string name="dialog_folder_info_device_list_item">%1$s (%2$s)</string>
     </resources>

app/src/main/res/values-nl/strings.xml

@@ -41,4 +41,5 @@
     <string name="settings_local_device_name">Naam van lokaal apparaat</string>
     <string name="settings_local_device_summary">De naam die andere apparaten voor dit apparaat zullen zien</string>
     <string name="device_id_dialog_title">Voer een apparaats-ID in</string>
+    <string name="dialog_folder_info_device_list_item">%1$s (%2$s)</string>
     </resources>

app/src/main/res/values-ro/strings.xml

@@ -40,15 +40,36 @@ fi stocate, dacă vor fi partajate cu terțe entități precum și cum vor fi
     <string name="intro_page_three_title">Partajați-vă directoarele</string>
     <string name="intro_page_two_description">Introduceți ID-ul Syncthing al unui dispozitiv sau scanați ID-ul unui dispozitiv dintr-un cod QR</string>
     <string name="intro_page_three_description">Acceptați acum dispozitivul cu ID-ul %1$s, și partajați un director cu el. S-ar putea să dureze câteva minute până când dispozitivele se vor conecta.</string>
+    <string name="intro_page_three_searching_device">Se încearcă găsirea celuilalt dispozitiv. Această operație poate dura un moment.</string>
     <string name="settings">Setări</string>
     <string name="settings_app_version_title">Versiune aplicație</string>
     <string name="settings_local_device_name">Nume local dispozitiv</string>
     <string name="settings_local_device_summary">Numele pe care celălalt dispozitiv îl va vedea pentru acest dispozitiv</string>
     <string name="settings_shutdown_delay_title">Temporizare oprire</string>
     <string name="settings_shutdown_delay_summary">După cât timp se va închide clientul Syncthing în funcție de ultima utilizare</string>
+    <string name="settings_force_stop">Forțează oprirea acestei aplicații</string>
+    <string name="settings_last_error_title">Ultima eroare</string>
+    <string name="settings_last_error_summary">Arată detaliile ultimei erori</string>
+    <string name="settings_report_bug_title">Raportează o eroare</string>
+    <string name="settings_report_bug_summary">Deschideți un raport de eroare pentru această aplicație pe GitHub</string>
+    <string name="copy_to_clipboard">Copiază în memorie</string>
+    <string name="copied_to_clipboard">Copiat în memorie</string>
     <string name="device_id_dialog_title">Introduceți ID dispozitiv</string>
     <string name="settings_shutdown_delay_10_seconds">10 secunde</string>
     <string name="settings_shutdown_delay_30_seconds">30 secunde</string>
     <string name="settings_shutdown_delay_1_minute">1 minut</string>
     <string name="settings_shutdown_delay_5_minutes">5 minute</string>
+    <string name="dialog_file_save_as">Salvează ca</string>
+    <string name="pending_index_updates">%d actualizări de index în așteptare</string>
+    <string name="device_status_connecting">Conectare la %s</string>
+    <string name="device_status_connected">Conectat la %s</string>
+    <string name="device_status_disconnected">Se va încerca conectarea în curând - există %d adrese cunoscute</string>
+    <string name="device_status_no_address">Nici o adresă cunoscută pentru acest dispozitiv</string>
+    <string name="dialog_enable_folder_sync_for_new_device_title">Activați sincronizarea directorului pentru un dispozitiv nou</string>
+    <string name="dialog_enable_folder_sync_for_new_device_text">Doriți să sincronizați %1$s cu %2$s (%3$s)?</string>
+    <string name="dialog_enable_folder_sync_for_new_device_positive">Se sincronizează</string>
+    <string name="dialog_enable_folder_sync_for_new_device_negative">Nu se sincronizează</string>
+    <string name="dialog_folder_info_device_list">Partajează directorul cu:</string>
+    <string name="dialog_folder_info_device_list_item">%1$s (%2$s)</string>
+    <string name="toast_error">O eroare s-a produs in Syncthing Lite. Puteți vedea detalii în setările Syncthing Lite.</string>
 </resources>

app/src/main/res/values-sv/strings.xml

@@ -36,15 +36,42 @@
     <string name="intro_page_three_title">Dela dina mappar</string>
     <string name="intro_page_two_description">Ange ett Syncthing enhets-ID, eller skanna ett enhets-ID-nummer från en QR-kod</string>
     <string name="intro_page_three_description">Acceptera nu enheten med ID %1$s och dela en mapp med den. Det kan ta några minuter tills enheterna ansluter.</string>
+    <string name="intro_page_three_searching_device">Försöker hitta den andra enheten. Det kan ta ett ögonblick.</string>
     <string name="settings">Inställningar</string>
     <string name="settings_app_version_title">Appversion</string>
     <string name="settings_local_device_name">Lokala enhetens namn</string>
     <string name="settings_local_device_summary">Namnet som andra enheter kommer att se för den här enheten</string>
     <string name="settings_shutdown_delay_title">Avstängningsfördröjning</string>
     <string name="settings_shutdown_delay_summary">Tid innan du stänger av Syncthing-klienten efter den senaste användningen</string>
+    <string name="settings_force_stop">Tvinga stoppa denna App</string>
+    <string name="settings_last_error_title">Senaste felet</string>
+    <string name="settings_last_error_summary">Visa detaljerna för det senaste felet</string>
+    <string name="settings_report_bug_title">Rapportera ett fel</string>
+    <string name="settings_report_bug_summary">Öppna problemen för den här appen på GitHub</string>
+    <string name="copy_to_clipboard">Kopiera till urklipp</string>
+    <string name="copied_to_clipboard">Kopieras till urklippet</string>
     <string name="device_id_dialog_title">Ange enhets-ID</string>
     <string name="settings_shutdown_delay_10_seconds">10 sekunder</string>
     <string name="settings_shutdown_delay_30_seconds">30 sekunder</string>
     <string name="settings_shutdown_delay_1_minute">1 minut</string>
     <string name="settings_shutdown_delay_5_minutes">5 minuter</string>
+    <string name="dialog_warning_reconnect_problem">
+        På grund av beteendet hos denna App och beteendet hos Syncthing-servern,
+        du kan inte återansluta i några minuter om appen dödades (på grund av att du tog bort från den senaste applistan)
+        eller anslutningen avbröts.
+        Detta gäller inte lokala upptäcktsanslutningar.
+   </string>
+    <string name="dialog_file_save_as">Spara som</string>
+    <string name="pending_index_updates">%d indexuppdateringar som väntar</string>
+    <string name="device_status_connecting">Ansluter till %s</string>
+    <string name="device_status_connected">Ansluten till %s</string>
+    <string name="device_status_disconnected">Kommer att försöka ansluta snart - det finns%d kända adresser</string>
+    <string name="device_status_no_address">Ingen känd adress för enheten</string>
+    <string name="dialog_enable_folder_sync_for_new_device_title">Aktivera mappsynkronisering för ny enhet</string>
+    <string name="dialog_enable_folder_sync_for_new_device_text">Vill du synkronisera %1$s med %2$s (%3$s)?</string>
+    <string name="dialog_enable_folder_sync_for_new_device_positive">Synkronisera</string>
+    <string name="dialog_enable_folder_sync_for_new_device_negative">Synkronisera inte</string>
+    <string name="dialog_folder_info_device_list">Dela mapp med:</string>
+    <string name="dialog_folder_info_device_list_item">%1$s (%2$s)</string>
+    <string name="toast_error">Något gick fel i Syncthing Lite. Du kan visa detaljerna från inställningarna för Syncthing Lite.</string>
 </resources>

app/src/main/res/values-zh-rCN/strings.xml

@@ -46,4 +46,5 @@
     <string name="settings_shutdown_delay_30_seconds">30 秒</string>
     <string name="settings_shutdown_delay_1_minute">1 分钟</string>
     <string name="settings_shutdown_delay_5_minutes">5 分钟</string>
-</resources>
+    <string name="dialog_folder_info_device_list_item">%1$s（%2$s）</string>
+    </resources>

app/src/main/res/values/strings.xml

@@ -36,14 +36,20 @@
     <string name="intro_page_three_title">Share your folders</string>
     <string name="intro_page_two_description">Enter a Syncthing device ID, or scan a device ID from a QR code</string>
     <string name="intro_page_three_description">Now accept the device with ID %1$s, and share a folder with it. It may take a few minutes until the devices connect.</string>
+    <string name="intro_page_three_searching_device">Trying to find the other device. This may take a moment.</string>
     <string name="settings">Settings</string>
     <string name="settings_app_version_title">App version</string>
     <string name="settings_local_device_name">Local device name</string>
     <string name="settings_local_device_summary">The name that other devices will see for this device</string>
     <string name="settings_shutdown_delay_title">Shutdown delay</string>
     <string name="settings_shutdown_delay_summary">Time before shuting down the Syncthing client after its last usage</string>
-    <string name="settings_crash_handler_title">Custom Crash-Handler</string>
-    <string name="settings_crash_handler_summary">Copy the error message to the clipboard when the App crashes</string>
+    <string name="settings_force_stop">Force stop this App</string>
+    <string name="settings_last_error_title">Last error</string>
+    <string name="settings_last_error_summary">View the details of the last error</string>
+    <string name="settings_report_bug_title">Report a bug</string>
+    <string name="settings_report_bug_summary">Open the issues for this App at GitHub</string>
+    <string name="copy_to_clipboard">Copy to clipboard</string>
+    <string name="copied_to_clipboard">Copied to the clipboard</string>
     <string name="device_id_dialog_title">Enter Device ID</string>
     <string name="settings_shutdown_delay_10_seconds">10 seconds</string>
     <string name="settings_shutdown_delay_30_seconds">30 seconds</string>
@@ -56,4 +62,16 @@
         This does not apply to local discovery connections.
     </string>
     <string name="dialog_file_save_as">Save as</string>
+    <string name="pending_index_updates">%d index updates pending</string>
+    <string name="device_status_connecting">Connecting to %s</string>
+    <string name="device_status_connected">Connected to %s</string>
+    <string name="device_status_disconnected">Will retry connecting soon - there are %d known addresses</string>
+    <string name="device_status_no_address">No known address for the device</string>
+    <string name="dialog_enable_folder_sync_for_new_device_title">Enable folder sync for new device</string>
+    <string name="dialog_enable_folder_sync_for_new_device_text">Do you want to sync %1$s with %2$s (%3$s)?</string>
+    <string name="dialog_enable_folder_sync_for_new_device_positive">Sync</string>
+    <string name="dialog_enable_folder_sync_for_new_device_negative">Do not sync</string>
+    <string name="dialog_folder_info_device_list">Share folder with:</string>
+    <string name="dialog_folder_info_device_list_item">%1$s (%2$s)</string>
+    <string name="toast_error">Something went wrong in Syncthing Lite. You can view the details from the settings of Syncthing Lite.</string>
 </resources>

app/src/main/res/xml/preferences.xml

@@ -24,15 +24,24 @@
 
         -->
 
-        <CheckBoxPreference
-            android:key="crash_handler"
-            android:title="@string/settings_crash_handler_title"
-            android:summary="@string/settings_crash_handler_summary" />
+        <Preference
+            android:key="last_crash"
+            android:title="@string/settings_last_error_title"
+            android:summary="@string/settings_last_error_summary" />
 
         <Preference
             android:key="app_version"
             android:title="@string/settings_app_version_title"/>
 
+        <Preference
+            android:key="report_bug"
+            android:title="@string/settings_report_bug_title"
+            android:summary="@string/settings_report_bug_summary" />
+
+        <Preference
+            android:key="force_stop"
+            android:title="@string/settings_force_stop" />
+
     </PreferenceCategory>
 
 </PreferenceScreen>

build.gradle

@@ -2,8 +2,8 @@
 
 buildscript {
     ext.kotlin_version = '1.3.0'
-    ext.support_version = '27.0.2'
-    ext.build_tools_version = '3.2.0'
+    ext.support_version = '27.1.1'
+    ext.build_tools_version = '3.2.1'
     ext.anko_version = '0.10.8'
     ext.protobuf_lite_version = '3.0.1'
     repositories {

settings.gradle

@@ -1 +1 @@
-include ':app', ':syncthing-repository-android', ':syncthing-repository-default', ':syncthing-relay-client', ':syncthing-bep', ':syncthing-core', ':syncthing-client', ':syncthing-discovery', ':syncthing-client-cli'
+include ':app', ':syncthing-repository-android', ':syncthing-repository-default', ':syncthing-relay-client', ':syncthing-bep', ':syncthing-core', ':syncthing-client', ':syncthing-discovery', ':syncthing-client-cli', ':syncthing-temp-repository-encryption'

syncthing-bep/src/main/kotlin/net/syncthing/java/bep/BlockPuller.kt

@@ -18,6 +18,7 @@ import com.google.protobuf.ByteString
 import kotlinx.coroutines.*
 import kotlinx.coroutines.channels.Channel
 import net.syncthing.java.bep.connectionactor.ConnectionActorWrapper
+import net.syncthing.java.bep.index.IndexHandler
 import net.syncthing.java.bep.utils.longSumBy
 import net.syncthing.java.core.beans.BlockInfo
 import net.syncthing.java.core.beans.FileBlocks

syncthing-bep/src/main/kotlin/net/syncthing/java/bep/BlockPusher.kt

@@ -17,10 +17,16 @@ package net.syncthing.java.bep
 import com.google.protobuf.ByteString
 import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.async
+import kotlinx.coroutines.channels.consumeEach
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.runBlocking
 import net.syncthing.java.bep.BlockExchangeProtos.Vector
 import net.syncthing.java.bep.connectionactor.ConnectionActorWrapper
-import net.syncthing.java.core.beans.*
+import net.syncthing.java.bep.index.*
+import net.syncthing.java.core.beans.BlockInfo
+import net.syncthing.java.core.beans.DeviceId
 import net.syncthing.java.core.beans.FileInfo.Version
+import net.syncthing.java.core.beans.FolderStats
 import net.syncthing.java.core.utils.BlockUtils
 import net.syncthing.java.core.utils.NetworkUtils
 import org.apache.commons.io.IOUtils
@@ -46,7 +52,7 @@ class BlockPusher(private val localDeviceId: DeviceId,
     private val logger = LoggerFactory.getLogger(javaClass)
 
     suspend fun pushDelete(folderId: String, targetPath: String): BlockExchangeProtos.IndexUpdate {
-        val fileInfo = indexHandler.waitForRemoteIndexAcquired(connectionHandler).getFileInfoByPath(folderId, targetPath)!!
+        val fileInfo = indexHandler.waitForRemoteIndexAcquiredWithTimeout(connectionHandler).getFileInfoByPath(folderId, targetPath)!!
         NetworkUtils.assertProtocol(connectionHandler.hasFolder(fileInfo.folder), {"supplied connection handler $connectionHandler will not share folder ${fileInfo.folder}"})
         return sendIndexUpdate(folderId, BlockExchangeProtos.FileInfo.newBuilder()
                 .setName(targetPath)
@@ -62,7 +68,7 @@ class BlockPusher(private val localDeviceId: DeviceId,
     }
 
     suspend fun pushFile(inputStream: InputStream, folderId: String, targetPath: String): FileUploadObserver {
-        val fileInfo = indexHandler.waitForRemoteIndexAcquired(connectionHandler).getFileInfoByPath(folderId, targetPath)
+        val fileInfo = indexHandler.waitForRemoteIndexAcquiredWithTimeout(connectionHandler).getFileInfoByPath(folderId, targetPath)
         NetworkUtils.assertProtocol(connectionHandler.hasFolder(folderId), {"supplied connection handler $connectionHandler will not share folder $folderId"})
         assert(fileInfo == null || fileInfo.folder == folderId)
         assert(fileInfo == null || fileInfo.path == targetPath)
@@ -99,20 +105,26 @@ class BlockPusher(private val localDeviceId: DeviceId,
         }
 
         logger.debug("send index update for file = {}", targetPath)
-        val indexListener = { folderInfo: FolderInfo, newRecords: List<FileInfo>, _: IndexInfo ->
-            if (folderInfo.folderId == folderId) {
-                for (fileInfo2 in newRecords) {
-                    if (fileInfo2.path == targetPath && fileInfo2.hash == dataSource.getHash()) { //TODO check not invalid
-                        //                                sentBlocks.addAll(dataSource.getHashes());
-                        isCompleted.set(true)
-                        synchronized(updateLock) {
-                            updateLock.notifyAll()
+        val indexListenerStream = indexHandler.subscribeToOnIndexUpdateEvents()
+        GlobalScope.launch {
+            indexListenerStream.consumeEach { event ->
+                if (event is IndexRecordAcquiredEvent) {
+                    val (indexFolderId, newRecords, _) = event
+
+                    if (indexFolderId == folderId) {
+                        for (fileInfo2 in newRecords) {
+                            if (fileInfo2.path == targetPath && fileInfo2.hash == dataSource.getHash()) { //TODO check not invalid
+                                //                                sentBlocks.addAll(dataSource.getHashes());
+                                isCompleted.set(true)
+                                synchronized(updateLock) {
+                                    updateLock.notifyAll()
+                                }
+                            }
                         }
                     }
                 }
             }
         }
-        indexHandler.registerOnIndexRecordAcquiredListener(indexListener)
         val indexUpdate = sendIndexUpdate(folderId, BlockExchangeProtos.FileInfo.newBuilder()
                 .setName(targetPath)
                 .setSize(fileSize)
@@ -128,9 +140,27 @@ class BlockPusher(private val localDeviceId: DeviceId,
             override fun close() {
                 logger.debug("closing upload process")
                 monitoringProcessExecutorService.shutdown()
-                indexHandler.unregisterOnIndexRecordAcquiredListener(indexListener)
+                indexListenerStream.cancel()
                 requestHandlerRegistry.unregisterListener(requestFilter)
-                val fileInfo1 = indexHandler.pushRecord(indexUpdate.folder, indexUpdate.filesList.single())
+                val (fileInfo1, folderStatsUpdate) = indexHandler.indexRepository.runInTransaction {
+                    val folderStatsUpdateCollector = FolderStatsUpdateCollector(folderId)
+
+                    // TODO: notify the IndexBrowsers again (as it was earlier)
+                    val fileInfo = IndexElementProcessor.pushRecord(
+                            it,
+                            indexUpdate.folder,
+                            indexUpdate.filesList.single(),
+                            folderStatsUpdateCollector,
+                            it.findFileInfo(folderId, indexUpdate.filesList.single().name)
+                    )
+
+                    IndexMessageProcessor.handleFolderStatsUpdate(it, folderStatsUpdateCollector)
+                    val folderStatsUpdate = it.findFolderStats(folderId) ?: FolderStats.createDummy(folderId)
+
+                    fileInfo to folderStatsUpdate
+                }
+
+                runBlocking { indexHandler.sendFolderStatsUpdate(folderStatsUpdate) }
                 logger.info("sent file info record = {}", fileInfo1)
             }
 
@@ -151,7 +181,7 @@ class BlockPusher(private val localDeviceId: DeviceId,
     private suspend fun sendIndexUpdate(folderId: String, fileInfoBuilder: BlockExchangeProtos.FileInfo.Builder,
                                         oldVersions: Iterable<Version>?): BlockExchangeProtos.IndexUpdate {
         run {
-            val nextSequence = indexHandler.sequencer().nextSequence()
+            val nextSequence = indexHandler.getNextSequenceNumber()
             val list = oldVersions ?: emptyList()
             logger.debug("version list = {}", list)
             val id = ByteBuffer.wrap(localDeviceId.toHashData()).long

syncthing-bep/src/main/kotlin/net/syncthing/java/bep/FolderBrowser.kt

@@ -1,58 +0,0 @@
-/* 
- * Copyright (C) 2016 Davide Imbriaco
- *
- * This Java file is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/.
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package net.syncthing.java.bep
-
-import net.syncthing.java.core.beans.FolderInfo
-import net.syncthing.java.core.beans.FolderStats
-import net.syncthing.java.core.interfaces.IndexRepository
-import java.io.Closeable
-
-class FolderBrowser internal constructor(private val indexHandler: IndexHandler) : Closeable {
-    private val folderStatsCache = mutableMapOf<String, FolderStats>()
-    private val indexRepositoryEventListener = { event: IndexRepository.FolderStatsUpdatedEvent ->
-        addFolderStats(event.getFolderStats())
-    }
-
-    fun folderInfoAndStatsList(): List<Pair<FolderInfo, FolderStats>> =
-            indexHandler.folderInfoList()
-                    .map { folderInfo -> Pair(folderInfo, getFolderStats(folderInfo.folderId)) }
-                    .sortedBy { it.first.label }
-
-    init {
-        indexHandler.indexRepository.setOnFolderStatsUpdatedListener(indexRepositoryEventListener)
-        addFolderStats(indexHandler.indexRepository.findAllFolderStats())
-    }
-
-    private fun addFolderStats(folderStatsList: List<FolderStats>) {
-        for (folderStats in folderStatsList) {
-            folderStatsCache.put(folderStats.folderId, folderStats)
-        }
-    }
-
-    fun getFolderStats(folder: String): FolderStats {
-        return folderStatsCache[folder] ?: let {
-            FolderStats.Builder()
-                    .setFolder(folder)
-                    .build()
-        }
-    }
-
-    fun getFolderInfo(folder: String): FolderInfo? {
-        return indexHandler.getFolderInfo(folder)
-    }
-
-    override fun close() {
-        indexHandler.indexRepository.setOnFolderStatsUpdatedListener(null)
-    }
-}

syncthing-bep/src/main/kotlin/net/syncthing/java/bep/IndexBrowser.kt

@@ -1,184 +0,0 @@
-/* 
- * Copyright (C) 2016 Davide Imbriaco
- *
- * This Java file is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/.
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package net.syncthing.java.bep
-
-import net.syncthing.java.core.beans.FileInfo
-import net.syncthing.java.core.interfaces.IndexRepository
-import net.syncthing.java.core.utils.PathUtils
-import net.syncthing.java.core.utils.awaitTerminationSafe
-import net.syncthing.java.core.utils.submitLogging
-import org.apache.commons.lang3.StringUtils
-import org.slf4j.LoggerFactory
-import java.io.Closeable
-import java.util.*
-import java.util.concurrent.Executors
-
-class IndexBrowser internal constructor(private val indexRepository: IndexRepository, private val indexHandler: IndexHandler,
-                                       val folder: String, private val includeParentInList: Boolean = false,
-                                       private val allowParentInRoot: Boolean = false, ordering: Comparator<FileInfo>?) : Closeable {
-
-    private fun isParent(fileInfo: FileInfo) = PathUtils.isParent(fileInfo.path)
-
-    val ALPHA_ASC_DIR_FIRST: Comparator<FileInfo> =
-            compareBy<FileInfo>({!isParent(it)}, {!it.isDirectory()})
-                    .thenBy { it.fileName.toLowerCase() }
-    val LAST_MOD_DESC: Comparator<FileInfo> =
-            compareBy<FileInfo>({!isParent(it)}, {it.lastModified})
-                    .thenBy { it.fileName.toLowerCase() }
-
-    private val ordering = ordering ?: ALPHA_ASC_DIR_FIRST
-    private val logger = LoggerFactory.getLogger(javaClass)
-
-    var currentPath: String = PathUtils.ROOT_PATH
-        private set
-    private val PARENT_FILE_INFO: FileInfo
-    private val ROOT_FILE_INFO: FileInfo
-    private val executorService = Executors.newSingleThreadScheduledExecutor()
-    private val preloadJobs = mutableSetOf<String>()
-    private val preloadJobsLock = Any()
-    private var mOnPathChangedListener: (() -> Unit)? = null
-
-    private fun isCacheReady(): Boolean {
-        synchronized(preloadJobsLock) {
-            return preloadJobs.isEmpty()
-        }
-    }
-
-    internal fun onIndexChangedevent(folder: String) {
-        if (folder == this.folder) {
-            preloadFileInfoForCurrentPath()
-        }
-    }
-
-    fun currentPathInfo(): FileInfo = getFileInfoByAbsolutePath(currentPath)
-
-    fun currentPathFileName(): String? = PathUtils.getFileName(currentPath)
-
-    fun isRoot(): Boolean = PathUtils.isRoot(currentPath)
-
-    init {
-        assert(folder.isNotEmpty())
-        PARENT_FILE_INFO = FileInfo(folder = folder, type = FileInfo.FileType.DIRECTORY, path = PathUtils.PARENT_PATH)
-        ROOT_FILE_INFO = FileInfo(folder = folder, type = FileInfo.FileType.DIRECTORY, path = PathUtils.ROOT_PATH)
-        navigateToAbsolutePath(PathUtils.ROOT_PATH)
-    }
-
-    fun setOnFolderChangedListener(onPathChangedListener: (() -> Unit)?) {
-        mOnPathChangedListener = onPathChangedListener
-    }
-
-    private fun preloadFileInfoForCurrentPath() {
-        logger.debug("trigger preload for folder = '{}'", folder)
-        synchronized(preloadJobsLock) {
-            currentPath.let<String, Any> { currentPath ->
-                if (preloadJobs.contains(currentPath)) {
-                    preloadJobs.remove(currentPath)
-                    preloadJobs.add(currentPath) ///add last
-                } else {
-                    preloadJobs.add(currentPath)
-                    executorService.submitLogging(object : Runnable {
-
-                        override fun run() {
-
-                            val preloadPath =
-                                    synchronized(preloadJobsLock) {
-                                        assert(!preloadJobs.isEmpty())
-                                        preloadJobs.last() //pop last job
-                                    }
-
-                            logger.info("folder preload BEGIN for folder = '{}' path = '{}'", folder, preloadPath)
-                            getFileInfoByAbsolutePath(preloadPath)
-                            if (!PathUtils.isRoot(preloadPath)) {
-                                val parent = PathUtils.getParentPath(preloadPath)
-                                getFileInfoByAbsolutePath(parent)
-                                listFiles(parent)
-                            }
-                            for (record in listFiles(preloadPath)) {
-                                if (record.path == PARENT_FILE_INFO.path && record.isDirectory()) {
-                                    listFiles(record.path)
-                                }
-                            }
-                            logger.info("folder preload END for folder = '{}' path = '{}'", folder, preloadPath)
-                            synchronized(preloadJobsLock) {
-                                preloadJobs.remove(preloadPath)
-                                if (isCacheReady()) {
-                                    logger.info("cache ready, notify listeners")
-                                    mOnPathChangedListener?.invoke()
-                                } else {
-                                    logger.info("still {} job[s] left in cache loader", preloadJobs.size)
-                                    executorService.submitLogging(this)
-                                }
-                            }
-                        }
-                    })
-                }
-            }
-        }
-    }
-
-    fun listFiles(path: String = currentPath): List<FileInfo> {
-        logger.debug("doListFiles for path = '{}' BEGIN", path)
-        val list = ArrayList(indexRepository.findNotDeletedFilesByFolderAndParent(folder, path))
-        logger.debug("doListFiles for path = '{}' : {} records loaded)", path, list.size)
-        if (includeParentInList && (!PathUtils.isRoot(path) || allowParentInRoot)) {
-            list.add(0, PARENT_FILE_INFO)
-        }
-        return list.sortedWith(ordering)
-    }
-
-    fun getFileInfoByAbsolutePath(path: String): FileInfo {
-        return if (PathUtils.isRoot(path)) {
-            ROOT_FILE_INFO
-        } else {
-            logger.debug("doGetFileInfoByAbsolutePath for path = '{}' BEGIN", path)
-            val fileInfo = indexRepository.findNotDeletedFileInfo(folder, path) ?: error("file not found for path = $path")
-            logger.debug("doGetFileInfoByAbsolutePath for path = '{}' END", path)
-            fileInfo
-        }
-    }
-
-    fun navigateTo(fileInfo: FileInfo) {
-        assert(fileInfo.isDirectory())
-        assert(fileInfo.folder == folder)
-        return if (fileInfo.path == PARENT_FILE_INFO.path)
-            navigateToAbsolutePath(PathUtils.getParentPath(currentPath))
-        else
-            navigateToAbsolutePath(fileInfo.path)
-    }
-
-    fun navigateToNearestPath(oldPath: String) {
-        if (!StringUtils.isBlank(oldPath)) {
-            navigateToAbsolutePath(oldPath)
-        }
-    }
-
-    private fun navigateToAbsolutePath(newPath: String) {
-        if (PathUtils.isRoot(newPath)) {
-            currentPath = PathUtils.ROOT_PATH
-        } else {
-            val fileInfo = getFileInfoByAbsolutePath(newPath)
-            assert(fileInfo.isDirectory(), {"cannot navigate to path ${fileInfo.path}: not a directory"})
-            currentPath = fileInfo.path
-        }
-        logger.info("navigate to path = '{}'", currentPath)
-        preloadFileInfoForCurrentPath()
-    }
-
-    override fun close() {
-        logger.info("closing")
-        indexHandler.unregisterIndexBrowser(this)
-        executorService.shutdown()
-        executorService.awaitTerminationSafe()
-    }
-}

syncthing-bep/src/main/kotlin/net/syncthing/java/bep/IndexHandler.kt

@@ -1,451 +0,0 @@
-/* 
- * Copyright (C) 2016 Davide Imbriaco
- *
- * This Java file is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/.
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package net.syncthing.java.bep
-
-import net.syncthing.java.bep.connectionactor.ClusterConfigInfo
-import net.syncthing.java.bep.connectionactor.ConnectionActorWrapper
-import net.syncthing.java.core.beans.*
-import net.syncthing.java.core.beans.FileInfo.Version
-import net.syncthing.java.core.configuration.Configuration
-import net.syncthing.java.core.interfaces.IndexRepository
-import net.syncthing.java.core.interfaces.Sequencer
-import net.syncthing.java.core.interfaces.TempRepository
-import net.syncthing.java.core.utils.NetworkUtils
-import net.syncthing.java.core.utils.awaitTerminationSafe
-import net.syncthing.java.core.utils.trySubmitLogging
-import org.apache.commons.lang3.tuple.Pair
-import org.bouncycastle.util.encoders.Hex
-import org.slf4j.LoggerFactory
-import java.io.Closeable
-import java.io.IOException
-import java.util.*
-import java.util.concurrent.Executors
-
-class IndexHandler(private val configuration: Configuration, val indexRepository: IndexRepository,
-                   private val tempRepository: TempRepository) : Closeable {
-    private val logger = LoggerFactory.getLogger(javaClass)
-    private val folderInfoByFolder = mutableMapOf<String, FolderInfo>()
-    private val indexMessageProcessor = IndexMessageProcessor()
-    private var lastIndexActivity: Long = 0
-    private val writeAccessLock = Object()
-    private val indexWaitLock = Object()
-    private val indexBrowsers = mutableSetOf<IndexBrowser>()
-    private val onIndexRecordAcquiredListeners = mutableSetOf<(FolderInfo, List<FileInfo>, IndexInfo) -> Unit>()
-    private val onFullIndexAcquiredListeners = mutableSetOf<(FolderInfo) -> Unit>()
-
-    private fun lastActive(): Long = System.currentTimeMillis() - lastIndexActivity
-
-    fun sequencer(): Sequencer = indexRepository.getSequencer()
-
-    fun folderList(): List<String> = folderInfoByFolder.keys.toList()
-
-    fun folderInfoList(): List<FolderInfo> = folderInfoByFolder.values.toList()
-
-    private fun markActive() {
-        lastIndexActivity = System.currentTimeMillis()
-    }
-
-    fun registerOnIndexRecordAcquiredListener(listener: (FolderInfo, List<FileInfo>, IndexInfo) -> Unit) {
-        onIndexRecordAcquiredListeners.add(listener)
-    }
-
-    fun unregisterOnIndexRecordAcquiredListener(listener: (FolderInfo, List<FileInfo>, IndexInfo) -> Unit) {
-        assert(onIndexRecordAcquiredListeners.contains(listener))
-        onIndexRecordAcquiredListeners.remove(listener)
-    }
-
-    fun registerOnFullIndexAcquiredListenersListener(listener: (FolderInfo) -> Unit) {
-        onFullIndexAcquiredListeners.add(listener)
-    }
-
-    fun unregisterOnFullIndexAcquiredListenersListener(listener: (FolderInfo) -> Unit) {
-        assert(onFullIndexAcquiredListeners.contains(listener))
-        onFullIndexAcquiredListeners.remove(listener)
-    }
-
-    init {
-        loadFolderInfoFromConfig()
-    }
-
-    private fun loadFolderInfoFromConfig() {
-        synchronized(writeAccessLock) {
-            for (folderInfo in configuration.folders) {
-                folderInfoByFolder.put(folderInfo.folderId, folderInfo) //TODO reference 'folder info' repository
-            }
-        }
-    }
-
-    @Synchronized
-    fun clearIndex() {
-        synchronized(writeAccessLock) {
-            indexRepository.clearIndex()
-            folderInfoByFolder.clear()
-            loadFolderInfoFromConfig()
-        }
-    }
-
-    internal fun isRemoteIndexAcquired(clusterConfigInfo: ClusterConfigInfo, peerDeviceId: DeviceId): Boolean {
-        var ready = true
-        for (folder in clusterConfigInfo.sharedFolderIds) {
-            val indexSequenceInfo = indexRepository.findIndexInfoByDeviceAndFolder(peerDeviceId, folder)
-            if (indexSequenceInfo == null || indexSequenceInfo.localSequence < indexSequenceInfo.maxSequence) {
-                logger.debug("waiting for index on folder = {} sequenceInfo = {}", folder, indexSequenceInfo)
-                ready = false
-            }
-        }
-        return ready
-    }
-
-    @Throws(InterruptedException::class)
-    fun waitForRemoteIndexAcquired(connectionHandler: ConnectionActorWrapper, timeoutSecs: Long? = null): IndexHandler {
-        val timeoutMillis = (timeoutSecs ?: DEFAULT_INDEX_TIMEOUT) * 1000
-        synchronized(indexWaitLock) {
-            while (!isRemoteIndexAcquired(connectionHandler.getClusterConfig(), connectionHandler.deviceId)) {
-                indexWaitLock.wait(timeoutMillis)
-                NetworkUtils.assertProtocol(/* TODO connectionHandler.getLastActive() < timeoutMillis || */ lastActive() < timeoutMillis,
-                        {"unable to acquire index from connection $connectionHandler, timeout reached!"})
-            }
-        }
-        logger.debug("acquired all indexes on connection {}", connectionHandler)
-        return this
-    }
-
-    fun handleClusterConfigMessageProcessedEvent(clusterConfig: BlockExchangeProtos.ClusterConfig) {
-        synchronized(writeAccessLock) {
-            for (folderRecord in clusterConfig.foldersList) {
-                val folder = folderRecord.id
-                val folderInfo = updateFolderInfo(folder, folderRecord.label)
-                logger.debug("acquired folder info from cluster config = {}", folderInfo)
-                for (deviceRecord in folderRecord.devicesList) {
-                    val deviceId = DeviceId.fromHashData(deviceRecord.id.toByteArray())
-                    if (deviceRecord.hasIndexId() && deviceRecord.hasMaxSequence()) {
-                        val folderIndexInfo = updateIndexInfo(folder, deviceId, deviceRecord.indexId, deviceRecord.maxSequence, null)
-                        logger.debug("acquired folder index info from cluster config = {}", folderIndexInfo)
-                    }
-                }
-            }
-        }
-    }
-
-    internal fun handleIndexMessageReceivedEvent(folderId: String, filesList: List<BlockExchangeProtos.FileInfo>, clusterConfigInfo: ClusterConfigInfo, peerDeviceId: DeviceId) {
-        indexMessageProcessor.handleIndexMessageReceivedEvent(folderId, filesList, clusterConfigInfo, peerDeviceId)
-    }
-
-    fun pushRecord(folder: String, bepFileInfo: BlockExchangeProtos.FileInfo): FileInfo? {
-        var fileBlocks: FileBlocks? = null
-        val builder = FileInfo.Builder()
-                .setFolder(folder)
-                .setPath(bepFileInfo.name)
-                .setLastModified(Date(bepFileInfo.modifiedS * 1000 + bepFileInfo.modifiedNs / 1000000))
-                .setVersionList((if (bepFileInfo.hasVersion()) bepFileInfo.version.countersList else null ?: emptyList()).map { record -> Version(record.id, record.value) })
-                .setDeleted(bepFileInfo.deleted)
-        when (bepFileInfo.type) {
-            BlockExchangeProtos.FileInfoType.FILE -> {
-                fileBlocks = FileBlocks(folder, builder.getPath()!!, ((bepFileInfo.blocksList ?: emptyList())).map { record ->
-                    BlockInfo(record.offset, record.size, Hex.toHexString(record.hash.toByteArray()))
-                })
-                builder
-                        .setTypeFile()
-                        .setHash(fileBlocks.hash)
-                        .setSize(bepFileInfo.size)
-            }
-            BlockExchangeProtos.FileInfoType.DIRECTORY -> builder.setTypeDir()
-            else -> {
-                logger.warn("unsupported file type = {}, discarding file info", bepFileInfo.type)
-                return null
-            }
-        }
-        return addRecord(builder.build(), fileBlocks)
-    }
-
-    private fun updateIndexInfo(folder: String, deviceId: DeviceId, indexId: Long?, maxSequence: Long?, localSequence: Long?): IndexInfo {
-        synchronized(writeAccessLock) {
-            var indexSequenceInfo = indexRepository.findIndexInfoByDeviceAndFolder(deviceId, folder)
-            var shouldUpdate = false
-            val builder: IndexInfo.Builder
-            if (indexSequenceInfo == null) {
-                shouldUpdate = true
-                assert(indexId != null, {"index sequence info not found, and supplied null index id (folder = $folder, device = $deviceId)"})
-                builder = IndexInfo.newBuilder()
-                        .setFolder(folder)
-                        .setDeviceId(deviceId.deviceId)
-                        .setIndexId(indexId!!)
-                        .setLocalSequence(0)
-                        .setMaxSequence(-1)
-            } else {
-                builder = indexSequenceInfo.copyBuilder()
-            }
-            if (indexId != null && indexId != builder.getIndexId()) {
-                shouldUpdate = true
-                builder.setIndexId(indexId)
-            }
-            if (maxSequence != null && maxSequence > builder.getMaxSequence()) {
-                shouldUpdate = true
-                builder.setMaxSequence(maxSequence)
-            }
-            if (localSequence != null && localSequence > builder.getLocalSequence()) {
-                shouldUpdate = true
-                builder.setLocalSequence(localSequence)
-            }
-            if (shouldUpdate) {
-                indexSequenceInfo = builder.build()
-                indexRepository.updateIndexInfo(indexSequenceInfo)
-            }
-            return indexSequenceInfo!!
-        }
-    }
-
-    private fun addRecord(record: FileInfo, fileBlocks: FileBlocks?): FileInfo? {
-        synchronized(writeAccessLock) {
-            val lastModified = indexRepository.findFileInfoLastModified(record.folder, record.path)
-            return if (lastModified != null && record.lastModified < lastModified) {
-                logger.trace("discarding record = {}, modified before local record", record)
-                null
-            } else {
-                indexRepository.updateFileInfo(record, fileBlocks)
-                logger.trace("loaded new record = {}", record)
-                indexBrowsers.forEach {
-                    it.onIndexChangedevent(record.folder)
-                }
-                record
-            }
-        }
-    }
-
-    fun getFileInfoByPath(folder: String, path: String): FileInfo? {
-        return indexRepository.findFileInfo(folder, path)
-    }
-
-    fun getFileInfoAndBlocksByPath(folder: String, path: String): Pair<FileInfo, FileBlocks>? {
-        val fileInfo = getFileInfoByPath(folder, path)
-        return if (fileInfo == null) {
-            null
-        } else {
-            assert(fileInfo.isFile())
-            val fileBlocks = indexRepository.findFileBlocks(folder, path)
-            checkNotNull(fileBlocks) {"file blocks not found for file info = $fileInfo"}
-
-            FileInfo.checkBlocks(fileInfo, fileBlocks)
-
-            Pair.of(fileInfo, fileBlocks)
-        }
-    }
-
-    private fun updateFolderInfo(folder: String, label: String?): FolderInfo {
-        var folderInfo: FolderInfo? = folderInfoByFolder[folder]
-        if (folderInfo == null || label.isNullOrEmpty()) {
-            folderInfo = FolderInfo(folder, label)
-            folderInfoByFolder.put(folderInfo.folderId, folderInfo)
-        }
-        return folderInfo
-    }
-
-    fun getFolderInfo(folder: String): FolderInfo? {
-        return folderInfoByFolder[folder]
-    }
-
-    fun getIndexInfo(device: DeviceId, folder: String): IndexInfo? {
-        return indexRepository.findIndexInfoByDeviceAndFolder(device, folder)
-    }
-
-    fun newFolderBrowser(): FolderBrowser {
-        return FolderBrowser(this)
-    }
-
-    fun newIndexBrowser(folder: String, includeParentInList: Boolean = false, allowParentInRoot: Boolean = false,
-                        ordering: Comparator<FileInfo>? = null): IndexBrowser {
-        val indexBrowser = IndexBrowser(indexRepository, this, folder, includeParentInList, allowParentInRoot, ordering)
-        indexBrowsers.add(indexBrowser)
-        return indexBrowser
-    }
-
-    internal fun unregisterIndexBrowser(indexBrowser: IndexBrowser) {
-        assert(indexBrowsers.contains(indexBrowser))
-        indexBrowsers.remove(indexBrowser)
-    }
-
-    override fun close() {
-        assert(indexBrowsers.isEmpty())
-        assert(onIndexRecordAcquiredListeners.isEmpty())
-        assert(onFullIndexAcquiredListeners.isEmpty())
-        indexMessageProcessor.stop()
-    }
-
-    private inner class IndexMessageProcessor {
-
-        private val executorService = Executors.newSingleThreadExecutor()
-        private var queuedMessages = 0
-        private var queuedRecords: Long = 0
-        //        private long lastRecordProcessingTime = 0;
-        //        , delay = 0;
-        //        private boolean addProcessingDelayForInterface = true;
-        //        private final int MIN_DELAY = 0, MAX_DELAY = 5000, MAX_RECORD_PER_PROCESS = 16, DELAY_FACTOR = 1;
-        private var startTime: Long? = null
-
-        fun handleIndexMessageReceivedEvent(folderId: String, filesList: List<BlockExchangeProtos.FileInfo>, clusterConfigInfo: ClusterConfigInfo, peerDeviceId: DeviceId) {
-            logger.info("received index message event, preparing (queued records = {} event record count = {})", queuedRecords, filesList.size)
-            markActive()
-            //            List<BlockExchangeProtos.FileInfo> fileList = event.getFilesList();
-            //            for (int index = 0; index < fileList.size(); index += MAX_RECORD_PER_PROCESS) {
-            //                BlockExchangeProtos.IndexUpdate data = BlockExchangeProtos.IndexUpdate.newBuilder()
-            //                    .addAllFiles(Iterables.limit(Iterables.skip(fileList, index), MAX_RECORD_PER_PROCESS))
-            //                    .setFolder(event.getFolder())
-            //                    .build();
-            //                if (queuedMessages > 0) {
-            //                    storeAndProcessBg(data, clusterConfigInfo, peerDeviceId);
-            //                } else {
-            //                    processBg(data, clusterConfigInfo, peerDeviceId);
-            //                }
-            //            }
-            val data = BlockExchangeProtos.IndexUpdate.newBuilder()
-                    .addAllFiles(filesList)
-                    .setFolder(folderId)
-                    .build()
-            if (queuedMessages > 0) {
-                storeAndProcessBg(data, clusterConfigInfo, peerDeviceId)
-            } else {
-                processBg(data, clusterConfigInfo, peerDeviceId)
-            }
-        }
-
-        private fun processBg(data: BlockExchangeProtos.IndexUpdate, clusterConfigInfo: ClusterConfigInfo?, peerDeviceId: DeviceId) {
-            logger.debug("received index message event, queuing for processing")
-            queuedMessages++
-            queuedRecords += data.filesCount.toLong()
-            executorService.trySubmitLogging(object : ProcessingRunnable() {
-                override fun runProcess() {
-                    doHandleIndexMessageReceivedEvent(data, clusterConfigInfo, peerDeviceId)
-                }
-            })
-        }
-
-        private fun storeAndProcessBg(data: BlockExchangeProtos.IndexUpdate, clusterConfigInfo: ClusterConfigInfo?, peerDeviceId: DeviceId) {
-            val key = tempRepository.pushTempData(data.toByteArray())
-            logger.debug("received index message event, stored to temp record {}, queuing for processing", key)
-            queuedMessages++
-            queuedRecords += data.filesCount.toLong()
-            executorService.trySubmitLogging(object : ProcessingRunnable() {
-                override fun runProcess() {
-                    try {
-                        doHandleIndexMessageReceivedEvent(key, clusterConfigInfo, peerDeviceId)
-                    } catch (ex: IOException) {
-                        logger.error("error processing index message", ex)
-                    }
-
-                }
-
-            })
-        }
-
-        private abstract inner class ProcessingRunnable : Runnable {
-
-            override fun run() {
-                startTime = System.currentTimeMillis()
-                runProcess()
-                queuedMessages--
-                //                lastRecordProcessingTime = stopwatch.elapsed(TimeUnit.MILLISECONDS) - delay;
-                //                logger.info("processed a bunch of records, {}*{} remaining", queuedMessages, MAX_RECORD_PER_PROCESS);
-                //                logger.debug("processed index message in {} secs", lastRecordProcessingTime / 1000d);
-                startTime = null
-            }
-
-            protected abstract fun runProcess()
-
-            //        private boolean isVersionOlderThanSequence(BlockExchangeProtos.FileInfo fileInfo, long localSequence) {
-            //            long fileSequence = fileInfo.getSequence();
-            //            //TODO should we check last version instead of sequence? verify
-            //            return fileSequence < localSequence;
-            //        }
-            @Throws(IOException::class)
-            protected fun doHandleIndexMessageReceivedEvent(key: String, clusterConfigInfo: ClusterConfigInfo?, peerDeviceId: DeviceId) {
-                logger.debug("processing index message event from temp record {}", key)
-                markActive()
-                val data = tempRepository.popTempData(key)
-                val message = BlockExchangeProtos.IndexUpdate.parseFrom(data)
-                doHandleIndexMessageReceivedEvent(message, clusterConfigInfo, peerDeviceId)
-            }
-
-            protected fun doHandleIndexMessageReceivedEvent(message: BlockExchangeProtos.IndexUpdate, clusterConfigInfo: ClusterConfigInfo?, peerDeviceId: DeviceId) {
-                //            synchronized (writeAccessLock) {
-                //                if (addProcessingDelayForInterface) {
-                //                    delay = Math.min(MAX_DELAY, Math.max(MIN_DELAY, lastRecordProcessingTime * DELAY_FACTOR));
-                //                    logger.info("add delay of {} secs before processing index message (to allow UI to process)", delay / 1000d);
-                //                    try {
-                //                        Thread.sleep(delay);
-                //                    } catch (InterruptedException ex) {
-                //                        logger.warn("interrupted", ex);
-                //                    }
-                //                } else {
-                //                    delay = 0;
-                //                }
-                logger.info("processing index message with {} records (queue size: messages = {} records = {})", message.filesCount, queuedMessages, queuedRecords)
-                //            String deviceId = connectionHandler.getDeviceId();
-                val folderId = message.folder
-                var sequence: Long = -1
-                val newRecords = mutableListOf<FileInfo>()
-                //                IndexInfo oldIndexInfo = indexRepository.findIndexInfoByDeviceAndFolder(deviceId, folder);
-                //            Stopwatch stopwatch = Stopwatch.createStarted();
-                logger.debug("processing {} index records for folder {}", message.filesList.size, folderId)
-                for (fileInfo in message.filesList) {
-                    markActive()
-                    //                    if (oldIndexInfo != null && isVersionOlderThanSequence(fileInfo, oldIndexInfo.getLocalSequence())) {
-                    //                        logger.trace("skipping file {}, version older than sequence {}", fileInfo, oldIndexInfo.getLocalSequence());
-                    //                    } else {
-                    val newRecord = pushRecord(folderId, fileInfo)
-                    if (newRecord != null) {
-                        newRecords.add(newRecord)
-                    }
-                    sequence = Math.max(fileInfo.sequence, sequence)
-                    markActive()
-                    //                    }
-                }
-                val newIndexInfo = updateIndexInfo(folderId, peerDeviceId, null, null, sequence)
-                val elap = System.currentTimeMillis() - startTime!!
-                queuedRecords -= message.filesCount.toLong()
-                logger.info("processed {} index records, acquired {} ({} secs, {} record/sec)", message.filesCount, newRecords.size, elap / 1000.0, Math.round(message.filesCount / (elap / 1000.0) * 100) / 100.0)
-                if (logger.isInfoEnabled && newRecords.size <= 10) {
-                    for (fileInfo in newRecords) {
-                        logger.info("acquired record = {}", fileInfo)
-                    }
-                }
-                val folderInfo = folderInfoByFolder[folderId]
-                if (!newRecords.isEmpty()) {
-                    onIndexRecordAcquiredListeners.forEach { it(folderInfo!!, newRecords, newIndexInfo) }
-                }
-                logger.debug("index info = {}", newIndexInfo)
-                if (isRemoteIndexAcquired(clusterConfigInfo!!, peerDeviceId)) {
-                    logger.debug("index acquired")
-                    onFullIndexAcquiredListeners.forEach { it(folderInfo!!)}
-                }
-                //                IndexHandler.this.notifyAll();
-                markActive()
-                synchronized(indexWaitLock) {
-                    indexWaitLock.notifyAll()
-                }
-            }
-        }
-
-        fun stop() {
-            logger.info("stopping index record processor")
-            executorService.shutdown()
-            executorService.awaitTerminationSafe()
-        }
-
-    }
-
-    companion object {
-
-        private const val DEFAULT_INDEX_TIMEOUT: Long = 30
-    }
-}

syncthing-bep/src/main/kotlin/net/syncthing/java/bep/connectionactor/ClusterConfigHandler.kt

@@ -16,7 +16,7 @@ package net.syncthing.java.bep.connectionactor
 
 import com.google.protobuf.ByteString
 import net.syncthing.java.bep.BlockExchangeProtos
-import net.syncthing.java.bep.IndexHandler
+import net.syncthing.java.bep.index.IndexHandler
 import net.syncthing.java.core.beans.DeviceId
 import net.syncthing.java.core.beans.FolderInfo
 import net.syncthing.java.core.configuration.Configuration
@@ -32,48 +32,52 @@ object ClusterConfigHandler {
     ): BlockExchangeProtos.ClusterConfig {
         val builder = BlockExchangeProtos.ClusterConfig.newBuilder()
 
-        for (folder in configuration.folders) {
-            val folderBuilder = BlockExchangeProtos.Folder.newBuilder()
-                    .setId(folder.folderId)
-                    .setLabel(folder.label)
+        indexHandler.indexRepository.runInTransaction { indexTransaction ->
+            configuration.folders
+                    .filter { it.deviceIdWhitelist.contains(deviceId) }
+                    .forEach { folder ->
+                        val folderBuilder = BlockExchangeProtos.Folder.newBuilder()
+                                .setId(folder.folderId)
+                                .setLabel(folder.label)
 
-            // add this device
-            folderBuilder.addDevices(
-                    BlockExchangeProtos.Device.newBuilder()
-                            .setId(ByteString.copyFrom(configuration.localDeviceId.toHashData()))
-                            .setIndexId(indexHandler.sequencer().indexId())
-                            .setMaxSequence(indexHandler.sequencer().currentSequence())
-            )
+                        // add this device
+                        folderBuilder.addDevices(
+                                BlockExchangeProtos.Device.newBuilder()
+                                        .setId(ByteString.copyFrom(configuration.localDeviceId.toHashData()))
+                                        .setIndexId(indexTransaction.getSequencer().indexId())
+                                        .setMaxSequence(indexTransaction.getSequencer().currentSequence())
+                        )
 
-            // add other device
-            val indexSequenceInfo = indexHandler.indexRepository.findIndexInfoByDeviceAndFolder(deviceId, folder.folderId)
+                        // add other device
+                        val indexSequenceInfo = indexTransaction.findIndexInfoByDeviceAndFolder(deviceId, folder.folderId)
 
-            folderBuilder.addDevices(
-                    BlockExchangeProtos.Device.newBuilder()
-                            .setId(ByteString.copyFrom(deviceId.toHashData()))
-                            .apply {
-                                indexSequenceInfo?.let {
-                                    setIndexId(indexSequenceInfo.indexId)
-                                    setMaxSequence(indexSequenceInfo.localSequence)
+                        folderBuilder.addDevices(
+                                BlockExchangeProtos.Device.newBuilder()
+                                        .setId(ByteString.copyFrom(deviceId.toHashData()))
+                                        .apply {
+                                            indexSequenceInfo?.let {
+                                                indexId = indexSequenceInfo.indexId
+                                                maxSequence = indexSequenceInfo.localSequence
 
-                                    logger.info("send delta index info device = {} index = {} max (local) sequence = {}",
-                                            indexSequenceInfo.deviceId,
-                                            indexSequenceInfo.indexId,
-                                            indexSequenceInfo.localSequence)
-                                }
-                            }
-            )
+                                                logger.info("send delta index info device = {} index = {} max (local) sequence = {}",
+                                                        indexSequenceInfo.deviceId,
+                                                        indexSequenceInfo.indexId,
+                                                        indexSequenceInfo.localSequence)
+                                            }
+                                        }
+                        )
 
-            builder.addFolders(folderBuilder)
+                        builder.addFolders(folderBuilder)
 
-            // TODO: add the other devices to the cluster config
+                        // TODO: add the other devices to the cluster config
+                    }
         }
 
         return builder.build()
     }
 
     // TODO: understand this
-    internal fun handleReceivedClusterConfig(
+    internal suspend fun handleReceivedClusterConfig(
             clusterConfig: BlockExchangeProtos.ClusterConfig,
             configuration: Configuration,
             otherDeviceId: DeviceId,
@@ -82,33 +86,69 @@ object ClusterConfigHandler {
         val folderInfoList = mutableListOf<ClusterConfigFolderInfo>()
         val newSharedFolders = mutableListOf<FolderInfo>()
 
-        for (folder in clusterConfig.foldersList ?: emptyList()) {
-            var folderInfo = ClusterConfigFolderInfo(folder.id, folder.label)
-            val devicesById = (folder.devicesList ?: emptyList())
-                    .associateBy { input ->
-                        DeviceId.fromHashData(input.id!!.toByteArray())
-                    }
-            val otherDevice = devicesById[otherDeviceId]
-            val ourDevice = devicesById[configuration.localDeviceId]
-            if (otherDevice != null) {
-                folderInfo = folderInfo.copy(isAnnounced = true)
-            }
-            if (ourDevice != null) {
-                folderInfo = folderInfo.copy(isShared = true)
-                logger.info("folder shared from device = {} folder = {}", otherDeviceId, folderInfo)
-                val folderIds = configuration.folders.map { it.folderId }
-                if (!folderIds.contains(folderInfo.folderId)) {
-                    val fi = FolderInfo(folderInfo.folderId, folderInfo.label)
-                    configuration.folders = configuration.folders + fi
-                    newSharedFolders.add(fi)
-                    logger.info("new folder shared = {}", folderInfo)
+        configuration.update { oldConfig ->
+            val configFolders = oldConfig.folders.toMutableSet()
+
+            for (folder in clusterConfig.foldersList ?: emptyList()) {
+                var folderInfo = ClusterConfigFolderInfo(folder.id, folder.label, isDeviceInSharedFolderWhitelist = false)
+                val devicesById = (folder.devicesList ?: emptyList())
+                        .associateBy { input ->
+                            DeviceId.fromHashData(input.id!!.toByteArray())
+                        }
+                val otherDevice = devicesById[otherDeviceId]
+                val ourDevice = devicesById[configuration.localDeviceId]
+                if (otherDevice != null) {
+                    folderInfo = folderInfo.copy(isAnnounced = true)
                 }
-            } else {
-                logger.info("folder not shared from device = {} folder = {}", otherDeviceId, folderInfo)
+                if (ourDevice != null) {
+                    folderInfo = folderInfo.copy(isShared = true)
+                    logger.info("folder shared from device = {} folder = {}", otherDeviceId, folderInfo)
+
+                    val oldFolderEntry = configFolders.find { it.folderId == folderInfo.folderId }
+
+                    if (oldFolderEntry == null) {
+                        folderInfo = folderInfo.copy(isDeviceInSharedFolderWhitelist = true)
+
+                        val newFolderInfo = FolderInfo(
+                                folderId = folderInfo.folderId,
+                                label = folderInfo.label,
+                                deviceIdWhitelist = setOf(otherDeviceId),
+                                deviceIdBlacklist = emptySet(),
+                                ignoredDeviceIdList = emptySet()
+                        )
+
+                        configFolders.add(newFolderInfo)
+                        newSharedFolders.add(newFolderInfo)
+                        logger.info("new folder shared = {}", folderInfo)
+                    } else {
+                        if (oldFolderEntry.deviceIdWhitelist.contains(otherDeviceId)) {
+                            folderInfo = folderInfo.copy(isDeviceInSharedFolderWhitelist = true)
+
+                            if (oldFolderEntry.label != folderInfo.label) {
+                                configFolders.remove(oldFolderEntry)
+                                configFolders.add(oldFolderEntry.copy(label = folderInfo.label))
+                            }
+                        } else {
+                            if (!oldFolderEntry.deviceIdBlacklist.contains(otherDeviceId)) {
+                                configFolders.remove(oldFolderEntry)
+                                configFolders.add(
+                                        oldFolderEntry.copy(
+                                                deviceIdBlacklist = oldFolderEntry.deviceIdBlacklist + setOf(otherDeviceId)
+                                        )
+                                )
+                            }
+                        }
+                    }
+                } else {
+                    logger.info("folder not shared from device = {} folder = {}", otherDeviceId, folderInfo)
+                }
+
+                folderInfoList.add(folderInfo)
             }
 
-            folderInfoList.add(folderInfo)
+            oldConfig.copy(folders = configFolders)
         }
+
         configuration.persistLater()
         indexHandler.handleClusterConfigMessageProcessedEvent(clusterConfig)
 
@@ -123,7 +163,7 @@ class ClusterConfigInfo (val folderInfo: List<ClusterConfigFolderInfo>, val newS
 
     val folderInfoById = folderInfo.associateBy { it.folderId }
     val sharedFolderIds: Set<String> by lazy {
-        folderInfo.filter { it.isShared }.map { it.folderId }.toSet()
+        folderInfo.filter { it.isShared && it.isDeviceInSharedFolderWhitelist }.map { it.folderId }.toSet()
     }
 }
 
@@ -131,7 +171,8 @@ data class ClusterConfigFolderInfo(
         val folderId: String,
         val label: String = folderId,
         val isAnnounced: Boolean = false,
-        val isShared: Boolean = false
+        val isShared: Boolean = false,
+        val isDeviceInSharedFolderWhitelist: Boolean
 ) {
     init {
         assert(folderId.isNotEmpty())

syncthing-bep/src/main/kotlin/net/syncthing/java/bep/connectionactor/ConnectionActorGenerator.kt

@@ -17,12 +17,17 @@ package net.syncthing.java.bep.connectionactor
 import kotlinx.coroutines.*
 import kotlinx.coroutines.channels.*
 import net.syncthing.java.bep.BlockExchangeProtos
-import net.syncthing.java.bep.IndexHandler
+import net.syncthing.java.bep.index.IndexHandler
 import net.syncthing.java.core.beans.DeviceAddress
 import net.syncthing.java.core.configuration.Configuration
 import org.slf4j.LoggerFactory
 import java.io.IOException
 
+data class Connection (
+        val actor: SendChannel<ConnectionAction>,
+        val clusterConfigInfo: ClusterConfigInfo
+)
+
 object ConnectionActorGenerator {
     private val closed = Channel<ConnectionAction>().apply { cancel() }
     private val logger = LoggerFactory.getLogger(ConnectionActorGenerator::class.java)
@@ -89,18 +94,42 @@ object ConnectionActorGenerator {
             configuration: Configuration,
             indexHandler: IndexHandler,
             requestHandler: (BlockExchangeProtos.Request) -> Deferred<BlockExchangeProtos.Response>
-    ) = GlobalScope.produce<Pair<SendChannel<ConnectionAction>, ClusterConfigInfo>> {
+    ) = GlobalScope.produce<Pair<Connection, ConnectionInfo>> {
         var currentActor: SendChannel<ConnectionAction> = closed
+        var currentClusterConfig = ClusterConfigInfo.dummy
         var currentDeviceAddress: DeviceAddress? = null
+        var currentStatus = ConnectionInfo.empty
+
+        suspend fun dispatchStatus() {
+            send(Connection(currentActor, currentClusterConfig) to currentStatus)
+        }
 
         suspend fun closeCurrent() {
             if (currentActor != closed) {
                 currentActor.close()
                 currentActor = closed
-                send(currentActor to ClusterConfigInfo.dummy)
+                currentClusterConfig = ClusterConfigInfo.dummy
+
+                if (currentStatus.status != ConnectionStatus.Disconnected) {
+                    currentStatus = currentStatus.copy(status = ConnectionStatus.Disconnected)
+                }
+
+                dispatchStatus()
             }
         }
 
+        suspend fun dispatchConnection(
+                connection: SendChannel<ConnectionAction>,
+                clusterConfig: ClusterConfigInfo,
+                deviceAddress: DeviceAddress
+        ) {
+            currentActor = connection
+            currentDeviceAddress = deviceAddress
+            currentClusterConfig = clusterConfig
+
+            dispatchStatus()
+        }
+
         suspend fun tryConnectingToAddressHandleBaseErrors(deviceAddress: DeviceAddress) = try {
             val newActor = ConnectionActor.createInstance(deviceAddress, configuration, indexHandler, requestHandler)
             val clusterConfig = ConnectionActorUtil.waitUntilConnected(newActor)
@@ -118,31 +147,37 @@ object ConnectionActorGenerator {
             null
         }
 
-        suspend fun dispatchConnection(
-                connection: SendChannel<ConnectionAction>,
-                clusterConfig: ClusterConfigInfo,
-                deviceAddress: DeviceAddress
-        ) {
-            currentActor = connection
-            currentDeviceAddress = deviceAddress
-
-            send(connection to clusterConfig)
-        }
-
         suspend fun tryConnectingToAddress(deviceAddress: DeviceAddress): Boolean {
             closeCurrent()
 
-            var connection = tryConnectingToAddressHandleBaseErrors(deviceAddress) ?: return false
+            suspend fun handleCancel() {
+                currentStatus = currentStatus.copy(
+                        status = ConnectionStatus.Disconnected
+                )
+                dispatchStatus()
+            }
+
+            currentStatus = currentStatus.copy(
+                    status = ConnectionStatus.Connecting,
+                    currentAddress = deviceAddress
+            )
+            dispatchStatus()
+
+            var connection = tryConnectingToAddressHandleBaseErrors(deviceAddress) ?: return run {handleCancel(); false}
 
             if (connection.second.newSharedFolders.isNotEmpty()) {
                 logger.debug("connected to $deviceAddress with new folders -> reconnect")
                 // reconnect to send new cluster config
                 connection.first.close()
-                connection = tryConnectingToAddressHandleBaseErrors(deviceAddress) ?: return false
+                connection = tryConnectingToAddressHandleBaseErrors(deviceAddress) ?: return run {handleCancel(); false}
             }
 
             logger.debug("connected to $deviceAddress")
 
+            currentStatus = currentStatus.copy(
+                    status = ConnectionStatus.Connected,
+                    currentAddress = deviceAddress
+            )
             dispatchConnection(connection.first, connection.second, deviceAddress)
 
             return true
@@ -157,18 +192,26 @@ object ConnectionActorGenerator {
         val reconnectTicker = ticker(delayMillis = 30 * 1000, initialDelayMillis = 0)
 
         deviceAddressSource.consume {
-            var lastDeviceAddressList: List<DeviceAddress> = emptyList()
-
             while (true) {
-                if (isConnected()) {
-                    lastDeviceAddressList = deviceAddressSource.poll() ?: lastDeviceAddressList
+                run {
+                    // get the new list version if there is any
+                    val newDeviceAddressList = deviceAddressSource.poll()
 
-                    if (lastDeviceAddressList.isNotEmpty()) {
+                    if (newDeviceAddressList != null) {
+                        currentStatus = currentStatus.copy(addresses = newDeviceAddressList)
+                        dispatchStatus()
+                    }
+                }
+
+                if (isConnected()) {
+                    val deviceAddressList = currentStatus.addresses
+
+                    if (deviceAddressList.isNotEmpty()) {
                         if (reconnectTicker.poll() != null) {
-                            if (currentDeviceAddress != lastDeviceAddressList.first()) {
+                            if (currentDeviceAddress != deviceAddressList.first()) {
                                 val oldDeviceAddress = currentDeviceAddress!!
 
-                                if (!tryConnectingToAddress(lastDeviceAddressList.first())) {
+                                if (!tryConnectingToAddress(deviceAddressList.first())) {
                                     tryConnectingToAddress(oldDeviceAddress)
                                 }
                             }
@@ -179,11 +222,15 @@ object ConnectionActorGenerator {
 
                     delay(500)  // don't take too much CPU
                 } else /* is not connected */ {
-                    // get the new list version if there is any
-                    lastDeviceAddressList = deviceAddressSource.poll() ?: lastDeviceAddressList
+                    if (currentStatus.status == ConnectionStatus.Connected) {
+                        currentStatus = currentStatus.copy(status = ConnectionStatus.Disconnected)
+                        dispatchStatus()
+                    }
+
+                    val deviceAddressList = currentStatus.addresses
 
                     // try all addresses
-                    for (address in lastDeviceAddressList) {
+                    for (address in deviceAddressList) {
                         if (tryConnectingToAddress(address)) {
                             break
                         }
@@ -194,9 +241,14 @@ object ConnectionActorGenerator {
                     reconnectTicker.poll()
 
                     // wait for new device address list but not more than 15 seconds before the next iteration
-                    lastDeviceAddressList = withTimeoutOrNull(15 * 1000) {
+                    val newDeviceAddressList = withTimeoutOrNull(15 * 1000) {
                         deviceAddressSource.receive()
-                    } ?: lastDeviceAddressList
+                    }
+
+                    if (newDeviceAddressList != null) {
+                        currentStatus = currentStatus.copy(addresses = newDeviceAddressList)
+                        dispatchStatus()
+                    }
                 }
             }
         }

syncthing-bep/src/main/kotlin/net/syncthing/java/bep/connectionactor/ConnectionActorUtil.kt

@@ -16,6 +16,7 @@ package net.syncthing.java.bep.connectionactor
 import kotlinx.coroutines.CompletableDeferred
 import kotlinx.coroutines.channels.SendChannel
 import net.syncthing.java.bep.BlockExchangeProtos
+import java.io.IOException
 
 object ConnectionActorUtil {
     suspend fun waitUntilConnected(actor: SendChannel<ConnectionAction>): ClusterConfigInfo {
@@ -28,18 +29,34 @@ object ConnectionActorUtil {
     }
 
     suspend fun sendRequest(request: BlockExchangeProtos.Request, actor: SendChannel<ConnectionAction>): BlockExchangeProtos.Response {
-        val deferred = CompletableDeferred<BlockExchangeProtos.Response>()
+        try {
+            val deferred = CompletableDeferred<BlockExchangeProtos.Response>()
 
-        actor.send(SendRequestConnectionAction(request, deferred))
+            actor.send(SendRequestConnectionAction(request, deferred))
 
-        return deferred.await()
+            return deferred.await()
+        } catch (ex: Exception) {
+            throw IOException("not connected", ex)
+        }
     }
 
     suspend fun sendIndexUpdate(update: BlockExchangeProtos.IndexUpdate, actor: SendChannel<ConnectionAction>) {
-        val deferred = CompletableDeferred<Unit?>()
+        try {
+            val deferred = CompletableDeferred<Unit?>()
 
-        actor.send(SendIndexUpdateAction(update, deferred))
+            actor.send(SendIndexUpdateAction(update, deferred))
 
-        deferred.await()
+            deferred.await()
+        } catch (ex: Exception) {
+            throw IOException("not connected", ex)
+        }
+    }
+
+    suspend fun disconnect(actor: SendChannel<ConnectionAction>) {
+        try {
+            actor.send(CloseConnectionAction)
+        } catch (ex: Exception) {
+            // ignore if the channel is closed already
+        }
     }
 }

syncthing-bep/src/main/kotlin/net/syncthing/java/bep/connectionactor/ConnectionActorWrapper.kt

@@ -14,73 +14,67 @@
 package net.syncthing.java.bep.connectionactor
 
 import kotlinx.coroutines.*
+import kotlinx.coroutines.channels.ConflatedBroadcastChannel
 import kotlinx.coroutines.channels.ReceiveChannel
-import kotlinx.coroutines.channels.SendChannel
 import kotlinx.coroutines.channels.consumeEach
 import net.syncthing.java.bep.BlockExchangeProtos
 import net.syncthing.java.core.beans.DeviceId
+import net.syncthing.java.core.exception.ExceptionReport
+import net.syncthing.java.core.exception.reportExceptions
 import java.io.IOException
 
 class ConnectionActorWrapper (
-        private val source: ReceiveChannel<Pair<SendChannel<ConnectionAction>, ClusterConfigInfo>>,
+        private val source: ReceiveChannel<Pair<Connection, ConnectionInfo>>,
         val deviceId: DeviceId,
-        val connectivityChangeListener: () -> Unit
+        private val exceptionReportHandler: (ExceptionReport) -> Unit
 ) {
     private val job = Job()
 
-    private var currentConnectionActor: SendChannel<ConnectionAction>? = null
-    private var clusterConfigInfo: ClusterConfigInfo? = null
+    private var connection: Connection? = null
+    private val connectionInfo = ConflatedBroadcastChannel<ConnectionInfo>(ConnectionInfo.empty)
 
-    var isConnected = false
-        get() = currentConnectionActor?.isClosedForSend == false
+    val isConnected
+        get() = connectionInfo.valueOrNull?.status == ConnectionStatus.Connected
 
     init {
-        GlobalScope.launch (job) {
-            source.consumeEach { (connectionActor, clusterConfig) ->
-                currentConnectionActor = connectionActor
-                clusterConfigInfo = clusterConfig
+        GlobalScope.async (job) {
+            source.consumeEach { (connection, connectionInfo) ->
+                this@ConnectionActorWrapper.connection = connection
+                this@ConnectionActorWrapper.connectionInfo.send(connectionInfo)
             }
-        }
-
-        // this is a very simple solution but it does its job
-        GlobalScope.launch (job) {
-            var previousConnected = false
-
-            while (isActive) {
-                val nowConnected = isConnected
-
-                if (previousConnected != nowConnected) {
-                    previousConnected = nowConnected
-
-                    connectivityChangeListener()
-                }
-
-                delay(200)
-            }
-        }
+        }.reportExceptions("ConnectionActorWrapper(${deviceId.deviceId})", exceptionReportHandler)
     }
 
     suspend fun sendRequest(request: BlockExchangeProtos.Request) = ConnectionActorUtil.sendRequest(
             request,
-            currentConnectionActor ?: throw IOException("not connected")
+            connection?.actor ?: throw IOException("not connected")
     )
 
     suspend fun sendIndexUpdate(update: BlockExchangeProtos.IndexUpdate) = ConnectionActorUtil.sendIndexUpdate(
             update,
-            currentConnectionActor ?: throw IOException("not connected")
+            connection?.actor ?: throw IOException("not connected")
     )
 
-    fun hasFolder(folderId: String) = clusterConfigInfo?.sharedFolderIds?.contains(folderId) ?: false
+    fun hasFolder(folderId: String) = connection?.clusterConfigInfo?.sharedFolderIds?.contains(folderId) ?: false
 
-    fun getClusterConfig() = clusterConfigInfo ?: throw IOException("not connected")
+    fun getClusterConfig() = connection?.clusterConfigInfo ?: throw IOException("not connected")
 
     fun shutdown() {
         job.cancel()
+        connectionInfo.close()
     }
 
     // this triggers a disconnection
     // the ConnectionActorGenerator will reconnect soon
     fun reconnect() {
-        currentConnectionActor?.close()
+        val actor = connection?.actor
+
+        GlobalScope.launch {
+            if (actor != null) {
+                ConnectionActorUtil.disconnect(actor)
+            }
+        }
     }
+
+    fun subscribeToConnectionInfo() = connectionInfo.openSubscription()
 }

syncthing-bep/src/main/kotlin/net/syncthing/java/bep/connectionactor/ConnectionInfo.kt

@@ -0,0 +1,21 @@
+package net.syncthing.java.bep.connectionactor
+
+import net.syncthing.java.core.beans.DeviceAddress
+
+data class ConnectionInfo (
+        val addresses: List<DeviceAddress>,
+        val currentAddress: DeviceAddress?,
+        val status: ConnectionStatus
+) {
+    companion object {
+        val empty = ConnectionInfo(
+                addresses = emptyList(),
+                currentAddress = null,
+                status = ConnectionStatus.Disconnected
+        )
+    }
+}
+
+enum class ConnectionStatus {
+    Disconnected, Connecting, Connected
+}

syncthing-bep/src/main/kotlin/net/syncthing/java/bep/connectionactor/HelloMessageHandler.kt

@@ -73,7 +73,7 @@ object HelloMessageHandler {
         )
     }
 
-    fun processHelloMessage(
+    suspend fun processHelloMessage(
             hello: BlockExchangeProtos.Hello,
             configuration: Configuration,
             deviceId: DeviceId
@@ -81,14 +81,17 @@ object HelloMessageHandler {
         logger.info("Received hello message, deviceName=${hello.deviceName}, clientName=${hello.clientName}, clientVersion=${hello.clientVersion}")
 
         // update the local device name
-        // TODO: this could need some locking
-        configuration.peers = configuration.peers.map { peer ->
-            if (peer.deviceId == deviceId) {
-                DeviceInfo(deviceId, hello.deviceName)
-            } else {
-                peer
-            }
-        }.toSet()
+        configuration.update { oldConfig ->
+            oldConfig.copy(
+                    peers = oldConfig.peers.map { peer ->
+                        if (peer.deviceId == deviceId) {
+                            DeviceInfo(deviceId, hello.deviceName)
+                        } else {
+                            peer
+                        }
+                    }.toSet()
+            )
+        }
 
         configuration.persistLater()
     }

syncthing-bep/src/main/kotlin/net/syncthing/java/bep/connectionactor/Instance.kt

@@ -22,7 +22,7 @@ import kotlinx.coroutines.channels.consumeEach
 import kotlinx.coroutines.sync.Mutex
 import kotlinx.coroutines.sync.withLock
 import net.syncthing.java.bep.BlockExchangeProtos
-import net.syncthing.java.bep.IndexHandler
+import net.syncthing.java.bep.index.IndexHandler
 import net.syncthing.java.core.beans.DeviceAddress
 import net.syncthing.java.core.configuration.Configuration
 import net.syncthing.java.core.security.KeystoreHandler

syncthing-bep/src/main/kotlin/net/syncthing/java/bep/folder/FolderBrowser.kt

@@ -0,0 +1,128 @@
+/*
+ * Copyright (C) 2016 Davide Imbriaco
+ * Copyright (C) 2018 Jonas Lochmann
+ *
+ * This Java file is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package net.syncthing.java.bep.folder
+
+import kotlinx.coroutines.*
+import kotlinx.coroutines.channels.ConflatedBroadcastChannel
+import kotlinx.coroutines.channels.consumeEach
+import kotlinx.coroutines.channels.first
+import kotlinx.coroutines.channels.produce
+import kotlinx.coroutines.sync.Mutex
+import kotlinx.coroutines.sync.withLock
+import net.syncthing.java.bep.index.*
+import net.syncthing.java.core.beans.FolderStats
+import net.syncthing.java.core.configuration.Configuration
+import java.io.Closeable
+
+class FolderBrowser internal constructor(private val indexHandler: IndexHandler, private val configuration: Configuration) : Closeable {
+    private val job = Job()
+    private val foldersStatus = ConflatedBroadcastChannel<Map<String, FolderStatus>>()
+
+    init {
+        GlobalScope.launch (job) {
+            // get initial status
+            val currentFolderStats = mutableMapOf<String, FolderStats>()
+
+            val currentIndexInfo = withContext(Dispatchers.IO) {
+                indexHandler.indexRepository.runInTransaction { indexTransaction ->
+                    configuration.folders.map { it.folderId }.forEach { folderId ->
+                        currentFolderStats[folderId] = indexTransaction.findFolderStats(folderId) ?: FolderStats.createDummy(folderId)
+                    }
+
+                    indexTransaction.findAllIndexInfos().groupBy { it.folderId }.toMutableMap()
+                }
+            }
+
+            // send status
+            suspend fun dispatch() {
+                foldersStatus.send(
+                        configuration.folders.map { info ->
+                            FolderStatus(
+                                    info = info,
+                                    stats = currentFolderStats[info.folderId] ?: FolderStats.createDummy(info.folderId),
+                                    indexInfo = currentIndexInfo[info.folderId] ?: emptyList()
+                            )
+                        }.associateBy { it.info.folderId }
+                )
+            }
+
+            dispatch()
+
+            // handle changes
+            val updateLock = Mutex()
+
+            async {
+                indexHandler.subscribeFolderStatsUpdatedEvents().consumeEach { event ->
+                    updateLock.withLock {
+                        when (event) {
+                            is FolderStatsUpdatedEvent -> currentFolderStats[event.folderStats.folderId] = event.folderStats
+                            FolderStatsResetEvent -> currentFolderStats.clear()
+                        }.let { /* require that all cases are handled */ }
+
+                        dispatch()
+                    }
+                }
+            }
+
+            async {
+                indexHandler.subscribeToOnIndexUpdateEvents().consumeEach { event ->
+                    updateLock.withLock {
+                        when (event) {
+                            is IndexRecordAcquiredEvent -> {
+                                val oldList = currentIndexInfo[event.folderId] ?: emptyList()
+                                val newList = oldList.filter { it.deviceId != event.indexInfo.deviceId } + event.indexInfo
+
+                                currentIndexInfo[event.folderId] = newList
+                            }
+                            IndexInfoClearedEvent -> currentIndexInfo.clear()
+                        }.let { /* require that all cases are handled */ }
+
+                        dispatch()
+                    }
+                }
+            }
+
+            async {
+                configuration.subscribe().consumeEach {
+                    dispatch()
+                }
+            }
+        }
+    }
+
+    fun folderInfoAndStatusStream() = GlobalScope.produce {
+        foldersStatus.openSubscription().consumeEach { folderStats ->
+            send(
+                    folderStats
+                            .values
+                            .sortedBy { it.info.label }
+            )
+        }
+    }
+
+    suspend fun folderInfoAndStatusList(): List<FolderStatus> = folderInfoAndStatusStream().first()
+
+    suspend fun getFolderStatus(folder: String): FolderStatus {
+        return getFolderStatus(folder, foldersStatus.openSubscription().first())
+    }
+
+    fun getFolderStatusSync(folder: String) = runBlocking { getFolderStatus(folder) }
+
+    private fun getFolderStatus(folder: String, folderStatus: Map<String, FolderStatus>) = folderStatus[folder] ?: FolderStatus.createDummy(folder)
+
+    override fun close() {
+        job.cancel()
+    }
+}

syncthing-bep/src/main/kotlin/net/syncthing/java/bep/folder/FolderStatus.kt

@@ -0,0 +1,35 @@
+package net.syncthing.java.bep.folder
+
+import net.syncthing.java.bep.utils.longMaxBy
+import net.syncthing.java.core.beans.FolderInfo
+import net.syncthing.java.core.beans.FolderStats
+import net.syncthing.java.core.beans.IndexInfo
+
+data class FolderStatus(
+        val info: FolderInfo,
+        val stats: FolderStats,
+        val indexInfo: List<IndexInfo>
+) {
+    companion object {
+        fun createDummy(folder: String) = FolderStatus(
+                info = FolderInfo(
+                        folder,
+                        folder,
+                        deviceIdBlacklist = emptySet(),
+                        deviceIdWhitelist = emptySet(),
+                        ignoredDeviceIdList = emptySet()
+                ),
+                stats = FolderStats.createDummy(folder),
+                indexInfo = emptyList()
+        )
+    }
+
+    val missingIndexUpdates: Long by lazy {
+        Math.max(
+                0,
+                indexInfo.longMaxBy ({ it.maxSequence }, 0) -
+                        indexInfo.longMaxBy ({ it.localSequence }, 0)
+
+        )
+    }
+}

syncthing-bep/src/main/kotlin/net/syncthing/java/bep/index/FolderStatsChangedEvent.kt

@@ -0,0 +1,7 @@
+package net.syncthing.java.bep.index
+
+import net.syncthing.java.core.beans.FolderStats
+
+sealed class FolderStatsChangedEvent
+data class FolderStatsUpdatedEvent(val folderStats: FolderStats): FolderStatsChangedEvent()
+object FolderStatsResetEvent: FolderStatsChangedEvent()

syncthing-bep/src/main/kotlin/net/syncthing/java/bep/index/FolderStatsUpdateCollector.kt

@@ -0,0 +1,17 @@
+package net.syncthing.java.bep.index
+
+import java.util.*
+
+class FolderStatsUpdateCollector (val folderId: String) {
+    var deltaFileCount = 0L
+    var deltaDirCount = 0L
+    var deltaSize = 0L
+    var lastModified = Date(0)
+
+    fun isEmpty() = (
+            deltaFileCount == 0L &&
+                    deltaDirCount == 0L &&
+                    deltaSize == 0L &&
+                    lastModified.time == 0L
+            )
+}

syncthing-bep/src/main/kotlin/net/syncthing/java/bep/index/IndexElementProcessor.kt

@@ -0,0 +1,164 @@
+package net.syncthing.java.bep.index
+
+import net.syncthing.java.bep.BlockExchangeProtos
+import net.syncthing.java.core.beans.BlockInfo
+import net.syncthing.java.core.beans.FileBlocks
+import net.syncthing.java.core.beans.FileInfo
+import net.syncthing.java.core.exception.ExceptionDetailException
+import net.syncthing.java.core.exception.ExceptionDetails
+import net.syncthing.java.core.interfaces.IndexTransaction
+import org.bouncycastle.util.encoders.Hex
+import org.slf4j.LoggerFactory
+import java.io.IOException
+import java.util.*
+
+object IndexElementProcessor {
+    private val logger = LoggerFactory.getLogger(IndexElementProcessor::class.java)
+
+    fun pushRecords(
+            transaction: IndexTransaction,
+            folder: String,
+            updates: List<BlockExchangeProtos.FileInfo>,
+            oldRecords: Map<String, FileInfo>,
+            folderStatsUpdateCollector: FolderStatsUpdateCollector
+    ): List<FileInfo> {
+        // this always keeps the last version per path
+        val filesToProcess = updates
+                .sortedBy { it.sequence }
+                .reversed()
+                .distinctBy { it.name /* this is the whole path */ }
+                .reversed()
+
+        val preparedUpdates = filesToProcess.mapNotNull { prepareUpdate(folder, it) }
+
+        val updatesToApply = preparedUpdates.filter { shouldUpdateRecord(oldRecords[it.first.path], it.first) }
+
+        transaction.updateFileInfoAndBlocks(
+                fileInfos = updatesToApply.map { it.first },
+                fileBlocks = updatesToApply.mapNotNull { it.second }
+        )
+
+        for ((newRecord) in updatesToApply) {
+            updateFolderStatsCollector(oldRecords[newRecord.path], newRecord, folderStatsUpdateCollector)
+        }
+
+        return updatesToApply.map { it.first }
+    }
+
+    fun pushRecord(
+            transaction: IndexTransaction,
+            folder: String,
+            bepFileInfo: BlockExchangeProtos.FileInfo,
+            folderStatsUpdateCollector: FolderStatsUpdateCollector,
+            oldRecord: FileInfo?
+    ): FileInfo? {
+        val update = prepareUpdate(folder, bepFileInfo)
+
+        return if (update != null) {
+            addRecord(
+                    transaction = transaction,
+                    newRecord = update.first,
+                    fileBlocks = update.second,
+                    folderStatsUpdateCollector = folderStatsUpdateCollector,
+                    oldRecord = oldRecord
+            )
+        } else {
+            null
+        }
+    }
+
+    private fun prepareUpdate(
+            folder: String,
+            bepFileInfo: BlockExchangeProtos.FileInfo
+    ): Pair<FileInfo, FileBlocks?>? {
+        val builder = FileInfo.Builder()
+                .setFolder(folder)
+                .setPath(bepFileInfo.name)
+                .setLastModified(Date(bepFileInfo.modifiedS * 1000 + bepFileInfo.modifiedNs / 1000000))
+                .setVersionList((if (bepFileInfo.hasVersion()) bepFileInfo.version.countersList else null ?: emptyList()).map { record -> FileInfo.Version(record.id, record.value) })
+                .setDeleted(bepFileInfo.deleted)
+
+        var fileBlocks: FileBlocks? = null
+
+        when (bepFileInfo.type) {
+            BlockExchangeProtos.FileInfoType.FILE -> {
+                fileBlocks = FileBlocks(folder, builder.getPath()!!, ((bepFileInfo.blocksList ?: emptyList())).map { record ->
+                    BlockInfo(record.offset, record.size, Hex.toHexString(record.hash.toByteArray()))
+                })
+                builder
+                        .setTypeFile()
+                        .setHash(fileBlocks.hash)
+                        .setSize(bepFileInfo.size)
+            }
+            BlockExchangeProtos.FileInfoType.DIRECTORY -> builder.setTypeDir()
+            else -> {
+                logger.warn("unsupported file type = {}, discarding file info", bepFileInfo.type)
+                return null
+            }
+        }
+
+        return builder.build() to fileBlocks
+    }
+
+    private fun shouldUpdateRecord(
+            oldRecord: FileInfo?,
+            newRecord: FileInfo
+    ) = oldRecord == null || newRecord.lastModified >= oldRecord.lastModified
+
+    private fun addRecord(
+            transaction: IndexTransaction,
+            newRecord: FileInfo,
+            oldRecord: FileInfo?,
+            fileBlocks: FileBlocks?,
+            folderStatsUpdateCollector: FolderStatsUpdateCollector
+    ): FileInfo? {
+        return if (shouldUpdateRecord(oldRecord, newRecord)) {
+            logger.trace("discarding record = {}, modified before local record", newRecord)
+            null
+        } else {
+            logger.trace("loaded new record = {}", newRecord)
+
+            transaction.updateFileInfo(newRecord, fileBlocks)
+            updateFolderStatsCollector(oldRecord, newRecord, folderStatsUpdateCollector)
+
+            newRecord
+        }
+    }
+
+    private fun updateFolderStatsCollector(
+            oldRecord: FileInfo?,
+            newRecord: FileInfo,
+            folderStatsUpdateCollector: FolderStatsUpdateCollector
+    ) {
+        val oldMissing = oldRecord == null || oldRecord.isDeleted
+        val newMissing = newRecord.isDeleted
+        val oldSizeMissing = oldMissing || !oldRecord!!.isFile()
+        val newSizeMissing = newMissing || !newRecord.isFile()
+
+        if (!oldSizeMissing) {
+            folderStatsUpdateCollector.deltaSize -= oldRecord!!.size!!
+        }
+
+        if (!newSizeMissing) {
+            folderStatsUpdateCollector.deltaSize += newRecord.size!!
+        }
+
+        if (!oldMissing) {
+            if (oldRecord!!.isFile()) {
+                folderStatsUpdateCollector.deltaFileCount--
+            } else if (oldRecord.isDirectory()) {
+                folderStatsUpdateCollector.deltaDirCount--
+            }
+        }
+
+        if (!newMissing) {
+            if (newRecord.isFile()) {
+                folderStatsUpdateCollector.deltaFileCount++
+            } else if (newRecord.isDirectory()) {
+                folderStatsUpdateCollector.deltaDirCount++
+            }
+        }
+
+        folderStatsUpdateCollector.lastModified = newRecord.lastModified
+    }
+}

syncthing-bep/src/main/kotlin/net/syncthing/java/bep/index/IndexHandler.kt

@@ -0,0 +1,197 @@
+/*
+ * Copyright (C) 2016 Davide Imbriaco
+ * Copyright (C) 2018 Jonas Lochmann
+ *
+ * This Java file is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package net.syncthing.java.bep.index
+
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.channels.BroadcastChannel
+import kotlinx.coroutines.channels.consume
+import kotlinx.coroutines.withContext
+import kotlinx.coroutines.withTimeoutOrNull
+import net.syncthing.java.bep.BlockExchangeProtos
+import net.syncthing.java.bep.connectionactor.ClusterConfigInfo
+import net.syncthing.java.bep.connectionactor.ConnectionActorWrapper
+import net.syncthing.java.bep.folder.FolderBrowser
+import net.syncthing.java.bep.index.browser.IndexBrowser
+import net.syncthing.java.core.beans.*
+import net.syncthing.java.core.configuration.Configuration
+import net.syncthing.java.core.exception.ExceptionReport
+import net.syncthing.java.core.interfaces.IndexRepository
+import net.syncthing.java.core.interfaces.IndexTransaction
+import net.syncthing.java.core.interfaces.TempRepository
+import org.apache.commons.lang3.tuple.Pair
+import org.slf4j.LoggerFactory
+import java.io.Closeable
+import java.io.IOException
+
+class IndexHandler(
+        configuration: Configuration,
+        val indexRepository: IndexRepository,
+        tempRepository: TempRepository,
+        exceptionReportHandler: (ExceptionReport) -> Unit
+) : Closeable {
+    private val logger = LoggerFactory.getLogger(javaClass)
+    private val indexInfoUpdateEvents = BroadcastChannel<IndexInfoUpdateEvent>(capacity = 16)
+    private val onFullIndexAcquiredEvents = BroadcastChannel<String>(capacity = 16)
+    private val onFolderStatsUpdatedEvents = BroadcastChannel<FolderStatsChangedEvent>(capacity = 16)
+
+    private val indexMessageProcessor = IndexMessageQueueProcessor(
+            indexRepository = indexRepository,
+            tempRepository = tempRepository,
+            isRemoteIndexAcquired = ::isRemoteIndexAcquired,
+            onIndexRecordAcquiredEvents = indexInfoUpdateEvents,
+            onFullIndexAcquiredEvents = onFullIndexAcquiredEvents,
+            onFolderStatsUpdatedEvents = onFolderStatsUpdatedEvents,
+            exceptionReportHandler = exceptionReportHandler
+    )
+
+    fun subscribeToOnFullIndexAcquiredEvents() = onFullIndexAcquiredEvents.openSubscription()
+    fun subscribeToOnIndexUpdateEvents() = indexInfoUpdateEvents.openSubscription()
+    fun subscribeFolderStatsUpdatedEvents() = onFolderStatsUpdatedEvents.openSubscription()
+
+    fun getNextSequenceNumber() = indexRepository.runInTransaction { it.getSequencer().nextSequence() }
+
+    suspend fun clearIndex() {
+        withContext(Dispatchers.IO) {
+            indexRepository.runInTransaction { it.clearIndex() }
+        }
+
+        onFolderStatsUpdatedEvents.send(FolderStatsResetEvent)
+        indexInfoUpdateEvents.send(IndexInfoClearedEvent)
+    }
+
+    private fun isRemoteIndexAcquiredWithoutTransaction(clusterConfigInfo: ClusterConfigInfo, peerDeviceId: DeviceId): Boolean {
+        return indexRepository.runInTransaction { transaction -> isRemoteIndexAcquired(clusterConfigInfo, peerDeviceId, transaction) }
+    }
+
+    private fun isRemoteIndexAcquired(clusterConfigInfo: ClusterConfigInfo, peerDeviceId: DeviceId, transaction: IndexTransaction): Boolean {
+        return clusterConfigInfo.sharedFolderIds.find { sharedFolderId ->
+            // try to find one folder which is not yet ready
+            val indexSequenceInfo = transaction.findIndexInfoByDeviceAndFolder(peerDeviceId, sharedFolderId)
+
+            indexSequenceInfo == null || indexSequenceInfo.localSequence < indexSequenceInfo.maxSequence
+        } == null
+    }
+
+    // the old implementation kept waiting when index updates were still happening, but waiting 30 seconds should be enough
+    suspend fun waitForRemoteIndexAcquiredWithTimeout(connectionHandler: ConnectionActorWrapper, timeoutSecs: Long? = null): IndexHandler {
+        val timeoutMillis = (timeoutSecs ?: DEFAULT_INDEX_TIMEOUT) * 1000
+
+        val ok = withTimeoutOrNull(timeoutMillis) {
+            waitForRemoteIndexAcquiredWithoutTimeout(connectionHandler)
+
+            true
+        } ?: false
+
+        if (!ok) {
+            throw IOException("unable to acquire index from connection $connectionHandler, timeout reached!")
+        }
+
+        return this
+    }
+
+    suspend fun waitForRemoteIndexAcquiredWithoutTimeout(connectionHandler: ConnectionActorWrapper) {
+        val events = onFullIndexAcquiredEvents.openSubscription()
+
+        events.consume {
+            fun isDone() = isRemoteIndexAcquiredWithoutTransaction(connectionHandler.getClusterConfig(), connectionHandler.deviceId)
+
+            if (isDone()) {
+                return
+            }
+
+            for (event in events) {
+                if (isDone()) {
+                    return
+                }
+            }
+        }
+    }
+
+    suspend fun handleClusterConfigMessageProcessedEvent(clusterConfig: BlockExchangeProtos.ClusterConfig) {
+        val updatedIndexInfos = indexRepository.runInTransaction { transaction ->
+            val updatedIndexInfos = mutableListOf<IndexInfo>()
+
+            for (folderRecord in clusterConfig.foldersList) {
+                val folder = folderRecord.id
+                logger.debug("acquired folder info from cluster config = {}", folder)
+                for (deviceRecord in folderRecord.devicesList) {
+                    val deviceId = DeviceId.fromHashData(deviceRecord.id.toByteArray())
+                    if (deviceRecord.hasIndexId() && deviceRecord.hasMaxSequence()) {
+                        val folderIndexInfo = UpdateIndexInfo.updateIndexInfoFromClusterConfig(transaction, folder, deviceId, deviceRecord.indexId, deviceRecord.maxSequence)
+                        logger.debug("acquired folder index info from cluster config = {}", folderIndexInfo)
+                        updatedIndexInfos.add(folderIndexInfo)
+                    }
+                }
+            }
+
+            updatedIndexInfos
+        }
+
+        updatedIndexInfos.forEach {
+            indexInfoUpdateEvents.send(
+                    IndexRecordAcquiredEvent(
+                            folderId = it.folderId,
+                            indexInfo = it,
+                            files = emptyList()
+                    )
+            )
+        }
+    }
+
+    internal suspend fun handleIndexMessageReceivedEvent(folderId: String, filesList: List<BlockExchangeProtos.FileInfo>, clusterConfigInfo: ClusterConfigInfo, peerDeviceId: DeviceId) {
+        indexMessageProcessor.handleIndexMessageReceivedEvent(folderId, filesList, clusterConfigInfo, peerDeviceId)
+    }
+
+    fun getFileInfoByPath(folder: String, path: String): FileInfo? {
+        return indexRepository.runInTransaction { it.findFileInfo(folder, path) }
+    }
+
+    fun getFileInfoAndBlocksByPath(folder: String, path: String): Pair<FileInfo, FileBlocks>? {
+        return indexRepository.runInTransaction { transaction ->
+            val fileInfo = transaction.findFileInfo(folder, path)
+
+            if (fileInfo == null) {
+                null
+            } else {
+                val fileBlocks = transaction.findFileBlocks(folder, path)
+
+                assert(fileInfo.isFile())
+                checkNotNull(fileBlocks) {"file blocks not found for file info = $fileInfo"}
+
+                FileInfo.checkBlocks(fileInfo, fileBlocks)
+
+                Pair.of(fileInfo, fileBlocks)
+            }
+        }
+    }
+
+    val folderBrowser = FolderBrowser(this, configuration)
+    val indexBrowser = IndexBrowser(indexRepository, this)
+
+    suspend fun sendFolderStatsUpdate(event: FolderStats) {
+        onFolderStatsUpdatedEvents.send(FolderStatsUpdatedEvent(event))
+    }
+
+    override fun close() {
+        indexInfoUpdateEvents.close()
+        onFullIndexAcquiredEvents.close()
+        indexMessageProcessor.stop()
+    }
+
+    companion object {
+
+        private const val DEFAULT_INDEX_TIMEOUT: Long = 30
+    }
+}

syncthing-bep/src/main/kotlin/net/syncthing/java/bep/index/IndexInfoUpdateEvent.kt

@@ -0,0 +1,8 @@
+package net.syncthing.java.bep.index
+
+import net.syncthing.java.core.beans.FileInfo
+import net.syncthing.java.core.beans.IndexInfo
+
+sealed class IndexInfoUpdateEvent
+data class IndexRecordAcquiredEvent(val folderId: String, val files: List<FileInfo>, val indexInfo: IndexInfo): IndexInfoUpdateEvent()
+object IndexInfoClearedEvent: IndexInfoUpdateEvent()

syncthing-bep/src/main/kotlin/net/syncthing/java/bep/index/IndexMessageProcessor.kt

@@ -0,0 +1,70 @@
+package net.syncthing.java.bep.index
+
+import net.syncthing.java.bep.BlockExchangeProtos
+import net.syncthing.java.core.beans.DeviceId
+import net.syncthing.java.core.beans.FileInfo
+import net.syncthing.java.core.beans.FolderStats
+import net.syncthing.java.core.beans.IndexInfo
+import net.syncthing.java.core.interfaces.IndexTransaction
+import org.slf4j.LoggerFactory
+import java.lang.RuntimeException
+
+object IndexMessageProcessor {
+    private val logger = LoggerFactory.getLogger(IndexMessageProcessor::class.java)
+
+    fun doHandleIndexMessageReceivedEvent(
+            message: BlockExchangeProtos.IndexUpdate,
+            peerDeviceId: DeviceId,
+            transaction: IndexTransaction
+    ): Result {
+        val folderId = message.folder
+        val oldIndexInfo = transaction.findIndexInfoByDeviceAndFolder(peerDeviceId, folderId)
+                ?: throw IndexInfoNotFoundException()
+
+        logger.debug("processing {} index records for folder {}", message.filesList.size, folderId)
+
+        val oldRecords = transaction.findFileInfo(folderId, message.filesList.map { it.name })
+        val folderStatsUpdateCollector = FolderStatsUpdateCollector(message.folder)
+
+        val newRecords = IndexElementProcessor.pushRecords(
+                transaction = transaction,
+                oldRecords = oldRecords,
+                folder = folderId,
+                folderStatsUpdateCollector = folderStatsUpdateCollector,
+                updates = message.filesList
+        )
+
+        val newIndexInfo = if (message.filesList.isEmpty()) {
+            oldIndexInfo
+        } else {
+            var sequence: Long = -1
+
+            for (newRecord in message.filesList) {
+                sequence = Math.max(newRecord.sequence, sequence)
+            }
+
+            handleFolderStatsUpdate(transaction, folderStatsUpdateCollector)
+
+            UpdateIndexInfo.updateIndexInfoFromIndexElementProcessor(transaction, oldIndexInfo, sequence)
+        }
+
+        return Result(newIndexInfo, newRecords.toList(), transaction.findFolderStats(folderId) ?: FolderStats.createDummy(folderId))
+    }
+
+    fun handleFolderStatsUpdate(transaction: IndexTransaction, folderStatsUpdateCollector: FolderStatsUpdateCollector) {
+        if (folderStatsUpdateCollector.isEmpty()) {
+            return
+        }
+
+        transaction.updateOrInsertFolderStats(
+                folder = folderStatsUpdateCollector.folderId,
+                deltaSize = folderStatsUpdateCollector.deltaSize,
+                deltaFileCount = folderStatsUpdateCollector.deltaFileCount,
+                deltaDirCount = folderStatsUpdateCollector.deltaDirCount,
+                lastUpdate = folderStatsUpdateCollector.lastModified
+        )
+    }
+
+    data class Result(val newIndexInfo: IndexInfo, val updatedFiles: List<FileInfo>, val newFolderStats: FolderStats)
+    class IndexInfoNotFoundException: RuntimeException()
+}

syncthing-bep/src/main/kotlin/net/syncthing/java/bep/index/IndexMessageQueueProcessor.kt

@@ -0,0 +1,159 @@
+/*
+ * Copyright (C) 2016 Davide Imbriaco
+ * Copyright (C) 2018 Jonas Lochmann
+ *
+ * This Java file is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package net.syncthing.java.bep.index
+
+import kotlinx.coroutines.*
+import kotlinx.coroutines.channels.BroadcastChannel
+import kotlinx.coroutines.channels.Channel
+import kotlinx.coroutines.channels.consumeEach
+import kotlinx.coroutines.sync.Mutex
+import kotlinx.coroutines.sync.withLock
+import net.syncthing.java.bep.BlockExchangeProtos
+import net.syncthing.java.bep.connectionactor.ClusterConfigInfo
+import net.syncthing.java.core.beans.DeviceId
+import net.syncthing.java.core.exception.ExceptionReport
+import net.syncthing.java.core.exception.reportExceptions
+import net.syncthing.java.core.interfaces.IndexRepository
+import net.syncthing.java.core.interfaces.IndexTransaction
+import net.syncthing.java.core.interfaces.TempRepository
+import org.slf4j.LoggerFactory
+
+class IndexMessageQueueProcessor (
+        private val indexRepository: IndexRepository,
+        private val tempRepository: TempRepository,
+        private val onIndexRecordAcquiredEvents: BroadcastChannel<IndexInfoUpdateEvent>,
+        private val onFullIndexAcquiredEvents: BroadcastChannel<String>,
+        private val onFolderStatsUpdatedEvents: BroadcastChannel<FolderStatsChangedEvent>,
+        private val isRemoteIndexAcquired: (ClusterConfigInfo, DeviceId, IndexTransaction) -> Boolean,
+        exceptionReportHandler: (ExceptionReport) -> Unit
+) {
+    private data class IndexUpdateAction(val update: BlockExchangeProtos.IndexUpdate, val clusterConfigInfo: ClusterConfigInfo, val peerDeviceId: DeviceId)
+    private data class StoredIndexUpdateAction(val updateId: String, val clusterConfigInfo: ClusterConfigInfo, val peerDeviceId: DeviceId)
+
+    companion object {
+        private val logger = LoggerFactory.getLogger(IndexMessageQueueProcessor::class.java)
+        private const val BATCH_SIZE = 128
+    }
+
+    private val job = Job()
+    private val indexUpdateIncomingLock = Mutex()
+    private val indexUpdateProcessStoredQueue = Channel<StoredIndexUpdateAction>(capacity = Channel.UNLIMITED)
+    private val indexUpdateProcessingQueue = Channel<IndexUpdateAction>(capacity = Channel.RENDEZVOUS)
+
+    suspend fun handleIndexMessageReceivedEvent(folderId: String, filesList: List<BlockExchangeProtos.FileInfo>, clusterConfigInfo: ClusterConfigInfo, peerDeviceId: DeviceId) {
+        filesList.chunked(BATCH_SIZE).forEach { chunck ->
+            handleIndexMessageReceivedEventWithoutChuncking(folderId, chunck, clusterConfigInfo, peerDeviceId)
+        }
+    }
+
+    suspend fun handleIndexMessageReceivedEventWithoutChuncking(folderId: String, filesList: List<BlockExchangeProtos.FileInfo>, clusterConfigInfo: ClusterConfigInfo, peerDeviceId: DeviceId) {
+        indexUpdateIncomingLock.withLock {
+            logger.info("received index message event, preparing")
+
+            val data = BlockExchangeProtos.IndexUpdate.newBuilder()
+                    .addAllFiles(filesList)
+                    .setFolder(folderId)
+                    .build()
+
+            if (indexUpdateProcessingQueue.offer(IndexUpdateAction(data, clusterConfigInfo, peerDeviceId))) {
+                // message is beeing processed now
+            } else {
+                val key = tempRepository.pushTempData(data.toByteArray())
+
+                logger.debug("received index message event, stored to temp record {}, queuing for processing", key)
+                indexUpdateProcessStoredQueue.send(StoredIndexUpdateAction(key, clusterConfigInfo, peerDeviceId))
+            }
+        }
+    }
+
+    init {
+        GlobalScope.async(Dispatchers.IO + job) {
+            indexUpdateProcessingQueue.consumeEach {
+                try {
+                    doHandleIndexMessageReceivedEvent(it)
+                } catch (ex: IndexMessageProcessor.IndexInfoNotFoundException) {
+                    // ignored
+                    // this is expected when the data is deleted but some index updates are still in the queue
+
+                    logger.warn("could not find index info for index update")
+                }
+            }
+        }.reportExceptions("IndexMessageQueueProcessor.indexUpdateProcessingQueue", exceptionReportHandler)
+
+        GlobalScope.async(Dispatchers.IO + job) {
+            indexUpdateProcessStoredQueue.consumeEach { action ->
+                logger.debug("processing index message event from temp record {}", action.updateId)
+
+                val data = tempRepository.popTempData(action.updateId)
+                val message = BlockExchangeProtos.IndexUpdate.parseFrom(data)
+
+                indexUpdateProcessingQueue.send(IndexUpdateAction(
+                        message,
+                        action.clusterConfigInfo,
+                        action.peerDeviceId
+                ))
+            }
+        }.reportExceptions("IndexMessageQueueProcessor.indexUpdateProcessStoredQueue", exceptionReportHandler)
+    }
+
+    private suspend fun doHandleIndexMessageReceivedEvent(action: IndexUpdateAction) {
+        val (message, clusterConfigInfo, peerDeviceId) = action
+
+        val folderInfo = clusterConfigInfo.folderInfoById[message.folder]
+                ?: throw IllegalStateException("got folder info for folder without known folder info")
+
+        if (!folderInfo.isDeviceInSharedFolderWhitelist) {
+            throw IllegalStateException("received index update for folder which is not shared")
+        }
+
+        logger.info("processing index message with {} records", message.filesCount)
+
+        val (indexResult, wasIndexAcquired) = indexRepository.runInTransaction { indexTransaction ->
+            val wasIndexAcquiredBefore = isRemoteIndexAcquired(clusterConfigInfo, peerDeviceId, indexTransaction)
+
+            val startTime = System.currentTimeMillis()
+
+            val indexResult = IndexMessageProcessor.doHandleIndexMessageReceivedEvent(
+                    message = message,
+                    peerDeviceId = peerDeviceId,
+                    transaction = indexTransaction
+            )
+
+            val endTime = System.currentTimeMillis()
+
+            logger.info("processed {} index records, acquired {} in ${endTime - startTime} ms", message.filesCount, indexResult.updatedFiles.size)
+
+            logger.debug("index info = {}", indexResult.newIndexInfo)
+
+            indexResult to ((!wasIndexAcquiredBefore) && isRemoteIndexAcquired(clusterConfigInfo, peerDeviceId, indexTransaction))
+        }
+
+        if (indexResult.updatedFiles.isNotEmpty()) {
+            onIndexRecordAcquiredEvents.send(IndexRecordAcquiredEvent(message.folder, indexResult.updatedFiles, indexResult.newIndexInfo))
+        }
+
+        onFolderStatsUpdatedEvents.send(FolderStatsUpdatedEvent(indexResult.newFolderStats))
+
+        if (wasIndexAcquired) {
+            logger.debug("index acquired")
+            onFullIndexAcquiredEvents.send(message.folder)
+        }
+    }
+
+    fun stop() {
+        logger.info("stopping index record processor")
+        job.cancel()
+    }
+}

syncthing-bep/src/main/kotlin/net/syncthing/java/bep/index/UpdateIndexInfo.kt

@@ -0,0 +1,57 @@
+package net.syncthing.java.bep.index
+
+import net.syncthing.java.core.beans.DeviceId
+import net.syncthing.java.core.beans.IndexInfo
+import net.syncthing.java.core.interfaces.IndexTransaction
+
+object UpdateIndexInfo {
+    fun updateIndexInfoFromClusterConfig(
+            transaction: IndexTransaction,
+            folder: String,
+            deviceId: DeviceId,
+            indexId: Long,
+            maxSequence: Long
+    ): IndexInfo {
+        val oldIndexSequenceInfo = transaction.findIndexInfoByDeviceAndFolder(deviceId, folder)
+
+        var newIndexSequenceInfo = oldIndexSequenceInfo ?: IndexInfo(
+                folderId = folder,
+                deviceId = deviceId.deviceId,
+                indexId = indexId,
+                localSequence = 0,
+                maxSequence = -1
+        )
+
+        if (indexId != newIndexSequenceInfo.indexId) {
+            newIndexSequenceInfo = newIndexSequenceInfo.copy(indexId = indexId)
+        }
+
+        if (maxSequence > newIndexSequenceInfo.maxSequence) {
+            newIndexSequenceInfo = newIndexSequenceInfo.copy(maxSequence = maxSequence)
+        }
+
+        if (oldIndexSequenceInfo != newIndexSequenceInfo) {
+            transaction.updateIndexInfo(newIndexSequenceInfo)
+        }
+
+        return newIndexSequenceInfo
+    }
+
+    fun updateIndexInfoFromIndexElementProcessor(
+            transaction: IndexTransaction,
+            oldIndexInfo: IndexInfo,
+            localSequence: Long?
+    ): IndexInfo {
+        var newIndexSequenceInfo = oldIndexInfo
+
+        if (localSequence != null && localSequence > newIndexSequenceInfo.localSequence) {
+            newIndexSequenceInfo = newIndexSequenceInfo.copy(localSequence = localSequence)
+        }
+
+        if (oldIndexInfo != newIndexSequenceInfo) {
+            transaction.updateIndexInfo(newIndexSequenceInfo)
+        }
+
+        return newIndexSequenceInfo
+    }
+}

syncthing-bep/src/main/kotlin/net/syncthing/java/bep/index/browser/DirectoryListing.kt

@@ -0,0 +1,25 @@
+package net.syncthing.java.bep.index.browser
+
+import net.syncthing.java.core.beans.FileInfo
+import net.syncthing.java.core.utils.PathUtils
+
+sealed class DirectoryListing {
+    abstract val folder: String
+    abstract val path: String
+}
+
+data class DirectoryContentListing(
+        val directoryInfo: FileInfo,
+        val parentEntry: FileInfo?,
+        val entries: List<FileInfo>
+): DirectoryListing() {
+    override val folder = directoryInfo.folder
+    override val path = directoryInfo.path
+}
+
+data class DirectoryNotFoundListing(
+        override val folder: String,
+        override val path: String
+): DirectoryListing() {
+    val theoreticalParentPath = if (PathUtils.isRoot(path)) null else PathUtils.getParentPath(path)
+}

syncthing-bep/src/main/kotlin/net/syncthing/java/bep/index/browser/IndexBrowser.kt

@@ -0,0 +1,172 @@
+/*
+ * Copyright (C) 2016 Davide Imbriaco
+ * Copyright (C) 2018 Jonas Lochmann
+ *
+ * This Java file is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package net.syncthing.java.bep.index.browser
+
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.channels.consume
+import kotlinx.coroutines.channels.produce
+import kotlinx.coroutines.withContext
+import net.syncthing.java.bep.index.FolderStatsUpdatedEvent
+import net.syncthing.java.bep.index.IndexHandler
+import net.syncthing.java.bep.index.IndexInfoUpdateEvent
+import net.syncthing.java.bep.index.IndexRecordAcquiredEvent
+import net.syncthing.java.core.beans.FileInfo
+import net.syncthing.java.core.interfaces.IndexRepository
+import net.syncthing.java.core.interfaces.IndexTransaction
+import net.syncthing.java.core.utils.PathUtils
+import java.util.*
+
+class IndexBrowser internal constructor(
+        private val indexRepository: IndexRepository,
+        private val indexHandler: IndexHandler
+) {
+    companion object {
+        val sortAlphabeticallyDirectoriesFirst: Comparator<FileInfo> =
+                compareBy<FileInfo>({!isParent(it) }, {!it.isDirectory()})
+                        .thenBy { it.fileName.toLowerCase() }
+
+        val sortByLastModification: Comparator<FileInfo> =
+                compareBy<FileInfo>({!isParent(it) }, {it.lastModified})
+                        .thenBy { it.fileName.toLowerCase() }
+
+        private fun isParent(fileInfo: FileInfo) = PathUtils.isParent(fileInfo.path)
+
+        fun getPathFileName(path: String) = PathUtils.getFileName(path)
+
+        const val ROOT_PATH = PathUtils.ROOT_PATH
+    }
+
+    fun getDirectoryListing(folder: String, path: String): DirectoryListing = indexRepository.runInTransaction { indexTransaction ->
+        val entries = indexTransaction.findNotDeletedFilesByFolderAndParent(folder, path)
+        val parentPath = if (PathUtils.isRoot(path)) null else PathUtils.getParentPath(path)
+        val parentEntry = if (PathUtils.isRoot(path)) null else getFileInfoByPathAllowNull(folder, PathUtils.getParentPath(path), indexTransaction)
+        val directoryInfo = getFileInfoByPathAllowNull(folder, path, indexTransaction)
+
+        if ((parentPath != null && parentEntry == null) || directoryInfo == null || directoryInfo.type != FileInfo.FileType.DIRECTORY) {
+            DirectoryNotFoundListing(folder, path)
+        } else {
+            DirectoryContentListing(
+                    entries = entries,
+                    parentEntry = parentEntry,
+                    directoryInfo = directoryInfo
+            )
+        }
+    }
+
+    fun streamDirectoryListing(folder: String, path: String) = GlobalScope.produce {
+        indexHandler.subscribeToOnIndexUpdateEvents().consume {
+            val directoryName = PathUtils.getFileName(path)
+            val parentPath = if (PathUtils.isRoot(path)) null else PathUtils.getParentPath(path)
+            val parentDirectoryName = if (parentPath != null) PathUtils.getFileName(parentPath) else null
+            val parentParentPath = if (parentPath == null || PathUtils.isRoot(parentPath)) null else PathUtils.getParentPath(parentPath)
+
+            // get the initial state
+            var (entries, parentEntry, directoryInfo) = withContext (Dispatchers.IO) {
+                indexRepository.runInTransaction { indexTransaction ->
+                    val entries = indexTransaction.findNotDeletedFilesByFolderAndParent(folder, path)
+                    val parentEntry = if (PathUtils.isRoot(path)) null else getFileInfoByPathAllowNull(folder, PathUtils.getParentPath(path), indexTransaction)
+                    val directoryInfo = getFileInfoByPathAllowNull(folder, path, indexTransaction)
+
+                    Triple(entries, parentEntry, directoryInfo)
+                }
+            }
+
+            var previousStatus: DirectoryListing? = null
+
+            suspend fun dispatch() {
+                // let Kotlin understand that the value does not change during running this
+                val directoryInfo = directoryInfo
+
+                val newStatus = if ((parentPath != null && parentEntry == null) || directoryInfo == null || directoryInfo.type != FileInfo.FileType.DIRECTORY) {
+                    DirectoryNotFoundListing(folder, path)
+                } else {
+                    DirectoryContentListing(
+                            entries = entries,
+                            parentEntry = parentEntry,
+                            directoryInfo = directoryInfo
+                    )
+                }
+
+                if (newStatus != previousStatus) {
+                    previousStatus = newStatus
+                    send(newStatus)
+                }
+            }
+
+            dispatch()
+
+            // handle updates
+            for (event in this) {
+                if (event is IndexRecordAcquiredEvent) {
+                    var hadChanges = false
+
+                    if (event.folderId == folder) {
+                        event.files.forEach { fileUpdate ->
+                            // entry change
+                            if (fileUpdate.parent == path) {
+                                hadChanges = true
+
+                                entries = entries.filter { it.fileName != fileUpdate.fileName }
+
+                                if (!fileUpdate.isDeleted) {
+                                    entries += listOf(fileUpdate)
+                                }
+                            }
+
+                            // handle directory info changes
+                            if (fileUpdate.parent == parentPath && fileUpdate.fileName == directoryName) {
+                                directoryInfo = if (fileUpdate.isDeleted) null else fileUpdate
+                                hadChanges = true
+                            }
+
+                            // handle parent directory info changes
+                            if (fileUpdate.parent == parentParentPath && fileUpdate.fileName == parentDirectoryName) {
+                                parentEntry = if (fileUpdate.isDeleted) null else fileUpdate
+                                hadChanges = true
+                            }
+                        }
+                    }
+
+                    if (hadChanges) {
+                        dispatch()
+                    }
+                }
+            }
+        }
+    }
+
+    fun getFileInfoByAbsolutePath(folder: String, path: String): FileInfo = getFileInfoByAbsolutePathAllowNull(folder, path)
+            ?: error("file not found for path = $path")
+
+    fun getFileInfoByAbsolutePathAllowNull(folder: String, path: String): FileInfo? {
+        return if (PathUtils.isRoot(path)) {
+            FileInfo(folder = folder, type = FileInfo.FileType.DIRECTORY, path = PathUtils.ROOT_PATH)
+        } else {
+            indexRepository.runInTransaction { it.findNotDeletedFileInfo(folder, path) }
+        }
+    }
+
+    fun getFileInfoByPath(folder: String, path: String, transaction: IndexTransaction) = getFileInfoByPathAllowNull(folder, path, transaction)
+            ?: error("file not found for path = $path")
+
+    fun getFileInfoByPathAllowNull(folder: String, path: String, transaction: IndexTransaction): FileInfo? {
+        return if (PathUtils.isRoot(path)) {
+            FileInfo(folder = folder, type = FileInfo.FileType.DIRECTORY, path = PathUtils.ROOT_PATH)
+        } else {
+            transaction.findNotDeletedFileInfo(folder, path)
+        }
+    }
+}

syncthing-bep/src/main/kotlin/net/syncthing/java/bep/utils/MaxBy.kt

@@ -0,0 +1,11 @@
+package net.syncthing.java.bep.utils
+
+inline fun <T> Iterable<T>.longMaxBy(selector: (T) -> Long, defaultValue: Long): Long {
+    var max = defaultValue
+
+    this.forEach {
+        max = Math.max(max, selector(it))
+    }
+
+    return max
+}

syncthing-client-cli/src/main/kotlin/net/syncthing/java/client/cli/Main.kt

@@ -13,7 +13,10 @@
  */
 package net.syncthing.java.client.cli
 
+import kotlinx.coroutines.channels.consume
 import kotlinx.coroutines.runBlocking
+import net.syncthing.java.bep.index.browser.DirectoryContentListing
+import net.syncthing.java.bep.index.browser.IndexBrowser
 import net.syncthing.java.client.SyncthingClient
 import net.syncthing.java.core.beans.DeviceId
 import net.syncthing.java.core.beans.DeviceInfo
@@ -26,7 +29,6 @@ import org.slf4j.LoggerFactory
 import java.io.File
 import java.io.FileInputStream
 import java.io.IOException
-import java.util.concurrent.CountDownLatch
 
 class Main(private val commandLine: CommandLine) {
 
@@ -46,7 +48,13 @@ class Main(private val commandLine: CommandLine) {
 
             val repository = SqlRepository(configuration.databaseFolder)
 
-            SyncthingClient(configuration, repository, repository).use { syncthingClient ->
+            SyncthingClient(
+                    configuration,
+                    repository,
+                    repository
+            ) { ex ->
+                throw ex.exception
+            }.use { syncthingClient ->
                 val main = Main(cmd)
                 cmd.options.forEach { main.handleOption(it, configuration, syncthingClient) }
             }
@@ -84,8 +92,16 @@ class Main(private val commandLine: CommandLine) {
                         .map { DeviceId(it.trim()) }
                         .toList()
                 System.out.println("set peers = $peers")
-                configuration.peers = peers.map { DeviceInfo(it, null) }.toSet()
-                configuration.persistNow()
+
+                runBlocking {
+                    configuration.update { oldConfig ->
+                        oldConfig.copy(
+                                peers = peers.map { DeviceInfo(it, it.shortId) }.toSet()
+                        )
+                    }
+                }
+
+                runBlocking { configuration.persistNow() }
             }
             "p" -> {
                 val folderAndPath = option.value
@@ -117,7 +133,6 @@ class Main(private val commandLine: CommandLine) {
                 System.out.println("file path = $path")
                 val folder = path.split(":".toRegex()).dropLastWhile({ it.isEmpty() }).toTypedArray()[0]
                 path = path.split(":".toRegex()).dropLastWhile({ it.isEmpty() }).toTypedArray()[1]
-                val latch = CountDownLatch(1)
                 val blockPusher = syncthingClient.getBlockPusher(folder)
 
                 val observer = runBlocking {
@@ -169,33 +184,35 @@ class Main(private val commandLine: CommandLine) {
                 System.out.println("uploaded dir to network")
             }
             "L" -> {
-                waitForIndexUpdate(syncthingClient, configuration)
-                for (folder in syncthingClient.indexHandler.folderList()) {
-                    syncthingClient.indexHandler.newIndexBrowser(folder).use { indexBrowser ->
-                        System.out.println("list folder = ${indexBrowser.folder}")
-                        for (fileInfo in indexBrowser.listFiles()) {
+                waitForIndexUpdate(syncthingClient)
+                for (folder in configuration.folders) {
+                    System.out.println("list folder = ${folder}")
+                    val listing = syncthingClient.indexHandler.indexBrowser.getDirectoryListing(folder.folderId, IndexBrowser.ROOT_PATH)
+
+                    if (listing is DirectoryContentListing) {
+                        for (fileInfo in listing.entries) {
                             System.out.println("${fileInfo.type.name.substring(0, 1)}\t${fileInfo.describeSize()}\t${fileInfo.path}")
                         }
                     }
                 }
             }
             "I" -> {
-                waitForIndexUpdate(syncthingClient, configuration)
+                waitForIndexUpdate(syncthingClient)
                 val folderInfo = StringBuilder()
-                for (folder in syncthingClient.indexHandler.folderList()) {
+                for (folder in configuration.folders) {
                     folderInfo.append("\nfolder info: ")
-                            .append(syncthingClient.indexHandler.getFolderInfo(folder))
+                            .append(folder)
                     folderInfo.append("\nfolder stats: ")
-                            .append(syncthingClient.indexHandler.newFolderBrowser().getFolderStats(folder).dumpInfo())
+                            .append(syncthingClient.indexHandler.folderBrowser.getFolderStatusSync(folder.folderId).stats.infoDump)
                             .append("\n")
                 }
                 System.out.println("folders:\n$folderInfo\n")
             }
             "l" -> {
                 var folderInfo = ""
-                for (folder in syncthingClient.indexHandler.folderList()) {
-                    folderInfo += "\nfolder info: " + syncthingClient.indexHandler.getFolderInfo(folder)
-                    folderInfo += "\nfolder stats: " + syncthingClient.indexHandler.newFolderBrowser().getFolderStats(folder).dumpInfo() + "\n"
+                for (folder in configuration.folders) {
+                    folderInfo += "\nfolder info: " + folder
+                    folderInfo += "\nfolder stats: " + syncthingClient.indexHandler.folderBrowser.getFolderStatusSync(folder.folderId).stats.infoDump + "\n"
                 }
                 System.out.println("folders:\n$folderInfo\n")
             }
@@ -211,11 +228,12 @@ class Main(private val commandLine: CommandLine) {
     }
 
     @Throws(InterruptedException::class)
-    private fun waitForIndexUpdate(client: SyncthingClient, configuration: Configuration) {
-        val latch = CountDownLatch(configuration.peers.size)
-        client.indexHandler.registerOnFullIndexAcquiredListenersListener {
-            latch.countDown()
+    private fun waitForIndexUpdate(client: SyncthingClient) {
+        // FIXME: what happens if the index update happened already?
+        runBlocking {
+            client.indexHandler.subscribeToOnFullIndexAcquiredEvents().consume {
+                this.receive()  // wait until there is one event
+            }
         }
-        latch.await()
     }
 }

syncthing-client/src/main/kotlin/net/syncthing/java/client/Connections.kt

@@ -13,14 +13,25 @@
  */
 package net.syncthing.java.client
 
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.channels.ConflatedBroadcastChannel
+import kotlinx.coroutines.channels.consumeEach
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.sync.Mutex
+import kotlinx.coroutines.sync.withLock
 import net.syncthing.java.bep.connectionactor.ConnectionActorWrapper
+import net.syncthing.java.bep.connectionactor.ConnectionInfo
 import net.syncthing.java.core.beans.DeviceId
 
 class Connections (val generate: (DeviceId) -> ConnectionActorWrapper) {
     private val map = mutableMapOf<DeviceId, ConnectionActorWrapper>()
+    private val connectionStatus = ConflatedBroadcastChannel<Map<DeviceId, ConnectionInfo>>(emptyMap())
+    private val connectionStatusLock = Mutex()
+    private val job = Job()
 
     fun getByDeviceId(deviceId: DeviceId): ConnectionActorWrapper {
-        return synchronized(map) {
+        synchronized(map) {
             val oldEntry = map[deviceId]
 
             if (oldEntry != null) {
@@ -30,6 +41,17 @@ class Connections (val generate: (DeviceId) -> ConnectionActorWrapper) {
 
                 map[deviceId] = newEntry
 
+                GlobalScope.launch (job) {
+                    newEntry.subscribeToConnectionInfo().consumeEach {  status ->
+                        connectionStatusLock.withLock {
+                            connectionStatus.send(
+                                    connectionStatus.value +
+                                            mapOf(deviceId to status)
+                            )
+                        }
+                    }
+                }
+
                 return newEntry
             }
         }
@@ -39,6 +61,8 @@ class Connections (val generate: (DeviceId) -> ConnectionActorWrapper) {
         synchronized(map) {
             map.values.forEach { it.shutdown() }
         }
+
+        job.cancel()
     }
 
     fun reconnectAllConnections() {
@@ -46,4 +70,12 @@ class Connections (val generate: (DeviceId) -> ConnectionActorWrapper) {
             map.values.forEach { it.reconnect() }
         }
     }
+
+    fun reconnect(deviceId: DeviceId) {
+        synchronized(map) {
+            map[deviceId]?.reconnect()
+        }
+    }
+
+    fun subscribeToConnectionStatusMap() = connectionStatus.openSubscription()
 }

syncthing-client/src/main/kotlin/net/syncthing/java/client/SyncthingClient.kt

@@ -16,27 +16,31 @@ package net.syncthing.java.client
 import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.async
 import kotlinx.coroutines.runBlocking
-import net.syncthing.java.bep.*
+import net.syncthing.java.bep.BlockPuller
+import net.syncthing.java.bep.BlockPullerStatus
+import net.syncthing.java.bep.BlockPusher
+import net.syncthing.java.bep.RequestHandlerRegistry
 import net.syncthing.java.bep.connectionactor.ConnectionActorGenerator
 import net.syncthing.java.bep.connectionactor.ConnectionActorWrapper
+import net.syncthing.java.bep.index.IndexHandler
 import net.syncthing.java.core.beans.DeviceId
 import net.syncthing.java.core.beans.FileInfo
 import net.syncthing.java.core.configuration.Configuration
+import net.syncthing.java.core.exception.ExceptionReport
 import net.syncthing.java.core.interfaces.IndexRepository
 import net.syncthing.java.core.interfaces.TempRepository
 import net.syncthing.java.discovery.DiscoveryHandler
 import java.io.Closeable
 import java.io.InputStream
-import java.util.*
 
 class SyncthingClient(
         private val configuration: Configuration,
         private val repository: IndexRepository,
-        private val tempRepository: TempRepository
+        private val tempRepository: TempRepository,
+        exceptionReportHandler: (ExceptionReport) -> Unit
 ) : Closeable {
-    val indexHandler = IndexHandler(configuration, repository, tempRepository)
-    val discoveryHandler = DiscoveryHandler(configuration)
-    private val onConnectionChangedListeners = Collections.synchronizedList(mutableListOf<(DeviceId) -> Unit>())
+    val indexHandler = IndexHandler(configuration, repository, tempRepository, exceptionReportHandler)
+    val discoveryHandler = DiscoveryHandler(configuration, exceptionReportHandler)
 
     private val requestHandlerRegistry = RequestHandlerRegistry()
     private val connections = Connections(
@@ -56,31 +60,20 @@ class SyncthingClient(
                                 configuration = configuration
                         ),
                         deviceId = deviceId,
-                        connectivityChangeListener = {
-                            synchronized(onConnectionChangedListeners) {
-                                onConnectionChangedListeners.forEach { it(deviceId) }
-                            }
-                        }
+                        exceptionReportHandler = exceptionReportHandler
                 )
             }
     )
 
-    fun clearCacheAndIndex() {
+    suspend fun clearCacheAndIndex() {
         indexHandler.clearIndex()
-        configuration.folders = emptySet()
+        configuration.update {
+            it.copy(folders = emptySet())
+        }
         configuration.persistLater()
         connections.reconnectAllConnections()
     }
 
-    fun addOnConnectionChangedListener(listener: (DeviceId) -> Unit) {
-        onConnectionChangedListeners.add(listener)
-    }
-
-    fun removeOnConnectionChangedListener(listener: (DeviceId) -> Unit) {
-        assert(onConnectionChangedListeners.contains(listener))
-        onConnectionChangedListeners.remove(listener)
-    }
-
     private fun getConnections() = configuration.peerIds.map { connections.getByDeviceId(it) }
 
     init {
@@ -88,6 +81,10 @@ class SyncthingClient(
         getConnections()
     }
 
+    fun reconnect(deviceId: DeviceId) {
+        connections.reconnect(deviceId)
+    }
+
     fun connectToNewlyAddedDevices() {
         getConnections()
     }
@@ -124,11 +121,7 @@ class SyncthingClient(
         )
     }
 
-    fun getPeerStatus() = configuration.peers.map { device ->
-        device.copy(
-                isConnected = connections.getByDeviceId(device.deviceId).isConnected
-        )
-    }
+    fun subscribeToConnectionStatus() = connections.subscribeToConnectionStatusMap()
 
     override fun close() {
         discoveryHandler.close()
@@ -136,6 +129,5 @@ class SyncthingClient(
         repository.close()
         tempRepository.close()
         connections.shutdown()
-        assert(onConnectionChangedListeners.isEmpty())
     }
 }

syncthing-core/build.gradle

@@ -11,4 +11,5 @@ dependencies {
     compile "com.google.code.gson:gson:2.8.2"
     compile "org.bouncycastle:bcmail-jdk15on:1.59"
     implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
+    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.0.0'
 }

syncthing-core/src/main/kotlin/net/syncthing/java/core/beans/DeviceId.kt

@@ -5,8 +5,9 @@ import com.google.gson.stream.JsonWriter
 import net.syncthing.java.core.utils.NetworkUtils
 import org.apache.commons.codec.binary.Base32
 import java.io.IOException
+import java.io.Serializable
 
-data class DeviceId @Throws(IOException::class) constructor(val deviceId: String) {
+data class DeviceId @Throws(IOException::class) constructor(val deviceId: String): Serializable {
 
     init {
         val withoutDashes = this.deviceId.replace("-", "")

syncthing-core/src/main/kotlin/net/syncthing/java/core/beans/DeviceInfo.kt

@@ -16,8 +16,9 @@ package net.syncthing.java.core.beans
 
 import com.google.gson.stream.JsonReader
 import com.google.gson.stream.JsonWriter
+import java.io.Serializable
 
-data class DeviceInfo(val deviceId: DeviceId, val name: String, val isConnected: Boolean? = null) {
+data class DeviceInfo(val deviceId: DeviceId, val name: String): Serializable {
 
     companion object {
         private const val DEVICE_ID = "deviceId"
@@ -44,9 +45,6 @@ data class DeviceInfo(val deviceId: DeviceId, val name: String, val isConnected:
         }
     }
 
-    constructor(deviceId: DeviceId, name: String?) :
-            this(deviceId, if (name != null && !name.isBlank()) name else deviceId.shortId, null)
-
     fun serialize(writer: JsonWriter) {
         writer.beginObject()
 

syncthing-core/src/main/kotlin/net/syncthing/java/core/beans/FolderInfo.kt

@@ -1,4 +1,4 @@
-/* 
+/*
  * Copyright (C) 2016 Davide Imbriaco
  * Copyright (C) 2018 Jonas Lochmann
  *
@@ -17,20 +17,72 @@ package net.syncthing.java.core.beans
 import com.google.gson.stream.JsonReader
 import com.google.gson.stream.JsonWriter
 
-open class FolderInfo(val folderId: String, label: String? = null) {
+// the whitelist are device ids with which the folder should be shared
+
+// the blacklist are device ids with which the folder should not be shared
+
+// the ignored device ids are devices for which the user confirmed the blacklist entry so that
+// there should not be any question
+data class FolderInfo(
+        val folderId: String,
+        val label: String,
+        val deviceIdWhitelist: Set<DeviceId>,
+        val deviceIdBlacklist: Set<DeviceId>,
+        val ignoredDeviceIdList: Set<DeviceId>
+) {
     companion object {
         private const val FOLDER_ID = "folderId"
         private const val LABEL = "label"
+        private const val DEVICE_ID_WHITELIST = "deviceWhitelist"
+        private const val DEVICE_ID_BLACKLIST = "deviceBlacklist"
+        private const val IGNORED_DEVICE_ID_LIST = "ignoredDeviceIdList"
 
         fun parse(reader: JsonReader): FolderInfo {
             var folderId: String? = null
             var label: String? = null
+            // the following fields were added later and thus have got a default value
+            var deviceIdWhitelist = emptySet<DeviceId>()
+            var deviceIdBlacklist = emptySet<DeviceId>()
+            var ignoredDeviceIdList = emptySet<DeviceId>()
 
             reader.beginObject()
             while (reader.hasNext()) {
                 when (reader.nextName()) {
                     FOLDER_ID -> folderId = reader.nextString()
                     LABEL -> label = reader.nextString()
+                    DEVICE_ID_WHITELIST -> {
+                        reader.beginArray()
+
+                        deviceIdWhitelist = mutableSetOf<DeviceId>().apply {
+                            while (reader.hasNext()) {
+                                add(DeviceId(reader.nextString()))
+                            }
+                        }
+
+                        reader.endArray()
+                    }
+                    DEVICE_ID_BLACKLIST -> {
+                        reader.beginArray()
+
+                        deviceIdBlacklist = mutableSetOf<DeviceId>().apply {
+                            while (reader.hasNext()) {
+                                add(DeviceId(reader.nextString()))
+                            }
+                        }
+
+                        reader.endArray()
+                    }
+                    IGNORED_DEVICE_ID_LIST -> {
+                        reader.beginArray()
+
+                        ignoredDeviceIdList = mutableSetOf<DeviceId>().apply {
+                            while (reader.hasNext()) {
+                                add(DeviceId(reader.nextString()))
+                            }
+                        }
+
+                        reader.endArray()
+                    }
                     else -> reader.skipValue()
                 }
             }
@@ -38,16 +90,23 @@ open class FolderInfo(val folderId: String, label: String? = null) {
 
             return FolderInfo(
                     folderId = folderId!!,
-                    label = label!!
+                    label = label!!,
+                    deviceIdBlacklist = deviceIdBlacklist,
+                    deviceIdWhitelist = deviceIdWhitelist,
+                    ignoredDeviceIdList = ignoredDeviceIdList
             )
         }
     }
 
-    val label: String
-
     init {
         assert(!folderId.isEmpty())
-        this.label = if (label != null && !label.isEmpty()) label else folderId
+        assert(deviceIdWhitelist.find { deviceIdBlacklist.contains(it) } == null)
+    }
+
+    val notIgnoredBlacklistEntries: Set<DeviceId> by lazy {
+        deviceIdBlacklist
+                .filterNot { ignoredDeviceIdList.contains(it) }
+                .toSet()
     }
 
     override fun toString(): String {
@@ -60,7 +119,18 @@ open class FolderInfo(val folderId: String, label: String? = null) {
         writer.name(FOLDER_ID).value(folderId)
         writer.name(LABEL).value(label)
 
+        writer.name(DEVICE_ID_WHITELIST).beginArray()
+        deviceIdWhitelist.forEach { writer.value(it.deviceId) }
+        writer.endArray()
+
+        writer.name(DEVICE_ID_BLACKLIST).beginArray()
+        deviceIdBlacklist.forEach { writer.value(it.deviceId) }
+        writer.endArray()
+
+        writer.name(IGNORED_DEVICE_ID_LIST).beginArray()
+        ignoredDeviceIdList.forEach { writer.value(it.deviceId) }
+        writer.endArray()
+
         writer.endObject()
     }
-
 }

syncthing-core/src/main/kotlin/net/syncthing/java/core/beans/FolderStats.kt

@@ -1,5 +1,6 @@
 /* 
  * Copyright (C) 2016 Davide Imbriaco
+ * Copyright (C) 2018 Jonas Lochmann
  *
  * This Java file is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
@@ -16,87 +17,22 @@ package net.syncthing.java.core.beans
 import org.apache.commons.io.FileUtils
 import java.util.*
 
-class FolderStats private constructor(val fileCount: Long, val dirCount: Long, val size: Long, val lastUpdate: Date, folder: String, label: String?) : FolderInfo(folder, label) {
-
-    fun getRecordCount(): Long = dirCount + fileCount
-
-    fun describeSize(): String = FileUtils.byteCountToDisplaySize(size)
-
-    fun dumpInfo(): String {
-        return ("folder " + label + " (" + folderId + ") file count = " + fileCount
-                + " dir count = " + dirCount + " folder size = " + describeSize() + " last update = " + lastUpdate)
+data class FolderStats(val fileCount: Long, val dirCount: Long, val size: Long, val lastUpdate: Date, val folderId: String) {
+    companion object {
+        fun createDummy(folderId: String) = FolderStats(
+                fileCount = 0,
+                dirCount = 0,
+                size = 0,
+                lastUpdate = Date(0),
+                folderId = folderId
+        )
     }
 
-    override fun toString(): String {
-        return "FolderStats{folder=$folderId, fileCount=$fileCount, dirCount=$dirCount, size=$size, lastUpdate=$lastUpdate}"
-    }
+    val recordCount: Long = dirCount + fileCount
 
-    fun copyBuilder(): Builder = Builder(fileCount, dirCount, size, folderId, label)
-
-    class Builder {
-
-        private var fileCount: Long = 0
-        private var dirCount: Long = 0
-        private var size: Long = 0
-        private var lastUpdate = Date(0)
-        private var folder: String? = null
-        private var label: String? = null
-
-        constructor()
-
-        constructor(fileCount: Long, dirCount: Long, size: Long, folder: String, label: String) {
-            this.fileCount = fileCount
-            this.dirCount = dirCount
-            this.size = size
-            this.folder = folder
-            this.label = label
-        }
-
-        fun getFileCount(): Long = fileCount
-
-        fun setFileCount(fileCount: Long): Builder {
-            this.fileCount = fileCount
-            return this
-        }
-
-        fun getDirCount(): Long = dirCount
-
-        fun setDirCount(dirCount: Long): Builder {
-            this.dirCount = dirCount
-            return this
-        }
-
-        fun getSize(): Long = size
-
-        fun setSize(size: Long): Builder {
-            this.size = size
-            return this
-        }
-
-        fun getLastUpdate(): Date = lastUpdate
-
-        fun setLastUpdate(lastUpdate: Date): Builder {
-            this.lastUpdate = lastUpdate
-            return this
-        }
-
-        fun getFolder(): String? = folder
-
-        fun setFolder(folder: String): Builder {
-            this.folder = folder
-            return this
-        }
-
-        fun getLabel(): String? = label
-
-        fun setLabel(label: String): Builder {
-            this.label = label
-            return this
-        }
-
-        fun build(): FolderStats {
-            return FolderStats(fileCount, dirCount, size, lastUpdate, folder!!, label)
-        }
+    val sizeDescription: String by lazy { FileUtils.byteCountToDisplaySize(size) }
 
+    val infoDump: String by lazy {
+        "folder $folderId file count = $fileCount dir count = $dirCount folder size = $sizeDescription last update = $lastUpdate"
     }
 }

syncthing-core/src/main/kotlin/net/syncthing/java/core/beans/IndexInfo.kt

@@ -1,5 +1,6 @@
 /* 
  * Copyright (C) 2016 Davide Imbriaco
+ * Copyright (C) 2018 Jonas Lochmann
  *
  * This Java file is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
@@ -14,98 +15,11 @@
 package net.syncthing.java.core.beans
 
 
-class IndexInfo private constructor(folder: String, val deviceId: String, val indexId: Long, val localSequence: Long, val maxSequence: Long) : FolderInfo(folder) {
+data class IndexInfo(val folderId: String, val deviceId: String, val indexId: Long, val localSequence: Long, val maxSequence: Long) {
 
-    fun getCompleted(): Double = if (maxSequence > 0) localSequence.toDouble() / maxSequence else 0.0
+    val completed: Double = if (maxSequence > 0) localSequence.toDouble() / maxSequence else 0.0
 
     init {
-        assert(!deviceId.isEmpty())
+        assert(deviceId.isNotEmpty())
     }
-
-    fun copyBuilder(): Builder {
-        return Builder(folderId, indexId, deviceId, localSequence, maxSequence)
-    }
-
-    override fun toString(): String {
-        return "FolderIndexInfo{indexId=$indexId, folder=$folderId, deviceId=$deviceId, localSequence=$localSequence, maxSequence=$maxSequence}"
-    }
-
-    class Builder {
-
-        private var indexId: Long = 0
-        private var deviceId: String? = null
-        private var folder: String? = null
-        private var localSequence: Long = 0
-        private var maxSequence: Long = 0
-
-        internal constructor()
-
-        internal constructor(folder: String, indexId: Long, deviceId: String, localSequence: Long, maxSequence: Long) {
-            assert(!folder.isEmpty())
-            assert(!deviceId.isEmpty())
-            this.folder = folder
-            this.indexId = indexId
-            this.deviceId = deviceId
-            this.localSequence = localSequence
-            this.maxSequence = maxSequence
-        }
-
-        fun getIndexId(): Long {
-            return indexId
-        }
-
-        fun getDeviceId(): String? {
-            return deviceId
-        }
-
-        fun getFolder(): String? {
-            return folder
-        }
-
-        fun getLocalSequence(): Long {
-            return localSequence
-        }
-
-        fun getMaxSequence(): Long {
-            return maxSequence
-        }
-
-        fun setIndexId(indexId: Long): Builder {
-            this.indexId = indexId
-            return this
-        }
-
-        fun setDeviceId(deviceId: String): Builder {
-            this.deviceId = deviceId
-            return this
-        }
-
-        fun setFolder(folder: String): Builder {
-            this.folder = folder
-            return this
-        }
-
-        fun setLocalSequence(localSequence: Long): Builder {
-            this.localSequence = localSequence
-            return this
-        }
-
-        fun setMaxSequence(maxSequence: Long): Builder {
-            this.maxSequence = maxSequence
-            return this
-        }
-
-        fun build(): IndexInfo {
-            return IndexInfo(folder!!, deviceId!!, indexId, localSequence, maxSequence)
-        }
-
-    }
-
-    companion object {
-
-        fun newBuilder(): Builder {
-            return Builder()
-        }
-    }
-
 }

syncthing-core/src/main/kotlin/net/syncthing/java/core/configuration/Configuration.kt

@@ -2,6 +2,14 @@ package net.syncthing.java.core.configuration
 
 import com.google.gson.stream.JsonReader
 import com.google.gson.stream.JsonWriter
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.channels.ConflatedBroadcastChannel
+import kotlinx.coroutines.channels.sendBlocking
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.runBlocking
+import kotlinx.coroutines.sync.Mutex
+import kotlinx.coroutines.sync.withLock
 import net.syncthing.java.core.beans.DeviceId
 import net.syncthing.java.core.beans.DeviceInfo
 import net.syncthing.java.core.beans.FolderInfo
@@ -17,12 +25,14 @@ import java.util.*
 class Configuration(configFolder: File = DefaultConfigFolder) {
 
     private val logger = LoggerFactory.getLogger(javaClass)
+    private val modifyLock = Mutex()
+    private val saveLock = Mutex()
+    private val configChannel = ConflatedBroadcastChannel<Config>()
 
     private val configFile = File(configFolder, ConfigFileName)
     val databaseFolder = File(configFolder, DatabaseFolderName)
 
     private var isSaved = true
-    private var config: Config
 
     init {
         configFolder.mkdirs()
@@ -36,19 +46,23 @@ class Configuration(configFolder: File = DefaultConfigFolder) {
             }
             val keystoreData = KeystoreHandler.Loader().generateKeystore()
             isSaved = false
-            config = Config(peers = setOf(), folders = setOf(),
-                    localDeviceName = localDeviceName,
-                    localDeviceId = keystoreData.first.deviceId,
-                    keystoreData = Base64.toBase64String(keystoreData.second),
-                    keystoreAlgorithm = keystoreData.third,
-                    customDiscoveryServers = emptySet(),
-                    useDefaultDiscoveryServers = true
+            configChannel.sendBlocking(
+                    Config(peers = setOf(), folders = setOf(),
+                            localDeviceName = localDeviceName,
+                            localDeviceId = keystoreData.first.deviceId,
+                            keystoreData = Base64.toBase64String(keystoreData.second),
+                            keystoreAlgorithm = keystoreData.third,
+                            customDiscoveryServers = emptySet(),
+                            useDefaultDiscoveryServers = true
+                    )
             )
-            persistNow()
+            runBlocking { persistNow() }
         } else {
-            config = Config.parse(JsonReader(StringReader(configFile.readText())))
+            configChannel.sendBlocking(
+                    Config.parse(JsonReader(StringReader(configFile.readText())))
+            )
         }
-        logger.debug("Loaded config = $config")
+        logger.debug("Loaded config = ${configChannel.value}")
     }
 
     companion object {
@@ -60,72 +74,89 @@ class Configuration(configFolder: File = DefaultConfigFolder) {
     val instanceId = Math.abs(Random().nextLong())
 
     val localDeviceId: DeviceId
-        get() = DeviceId(config.localDeviceId)
+        get() = DeviceId(configChannel.value.localDeviceId)
 
     val discoveryServers: Set<DiscoveryServer>
-        get() = config.customDiscoveryServers + (if (config.useDefaultDiscoveryServers) DiscoveryServer.defaultDiscoveryServers else emptySet())
+        get() = configChannel.value.let { config ->
+            config.customDiscoveryServers + (if (config.useDefaultDiscoveryServers) DiscoveryServer.defaultDiscoveryServers else emptySet())
+        }
 
     val keystoreData: ByteArray
-        get() = Base64.decode(config.keystoreData)
+        get() = Base64.decode(configChannel.value.keystoreData)
 
     val keystoreAlgorithm: String
-        get() = config.keystoreAlgorithm
+        get() = configChannel.value.keystoreAlgorithm
 
     val clientName = "syncthing-java"
 
     val clientVersion = javaClass.`package`.implementationVersion ?: "0.0.0"
 
     val peerIds: Set<DeviceId>
-        get() = config.peers.map { it.deviceId }.toSet()
+        get() = configChannel.value.peers.map { it.deviceId }.toSet()
 
-    var localDeviceName: String
-        get() = config.localDeviceName
-        set(localDeviceName) {
-            config = config.copy(localDeviceName = localDeviceName)
-            isSaved = false
+    val localDeviceName: String
+        get() = configChannel.value.localDeviceName
+
+    val folders: Set<FolderInfo>
+        get() = configChannel.value.folders
+
+    val peers: Set<DeviceInfo>
+        get() = configChannel.value.peers
+
+    suspend fun update(operation: suspend (Config) -> Config): Boolean {
+        modifyLock.withLock {
+            val oldConfig = configChannel.value
+            val newConfig = operation(oldConfig)
+
+            if (oldConfig != newConfig) {
+                configChannel.send(newConfig)
+                isSaved = false
+
+                return true
+            } else {
+                return false
+            }
         }
+    }
 
-    var folders: Set<FolderInfo>
-        get() = config.folders
-        set(folders) {
-            config = config.copy(folders = folders)
-            isSaved = false
-        }
-
-    var peers: Set<DeviceInfo>
-        get() = config.peers
-        set(peers) {
-            config = config.copy(peers = peers)
-            isSaved = false
-        }
-
-    fun persistNow() {
+    suspend fun persistNow() {
         persist()
     }
 
     fun persistLater() {
-        Thread { persist() }.start()
+        GlobalScope.launch (Dispatchers.IO) { persist() }
     }
 
-    private fun persist() {
-        if (isSaved)
-            return
+    private suspend fun persist() {
+        saveLock.withLock {
+            val (config1, isConfig1Saved) = modifyLock.withLock { configChannel.value to isSaved }
+
+            if (isConfig1Saved) {
+                return
+            }
 
-        config.let {
             System.out.println("writing config to $configFile")
+
             configFile.writeText(
                     StringWriter().apply {
                         JsonWriter(this).apply {
                             setIndent("  ")
 
-                            config.serialize(this)
+                            config1.serialize(this)
                         }
                     }.toString()
             )
-            isSaved = true
+
+            modifyLock.withLock {
+                if (config1 === configChannel.value) {
+                    isSaved = true
+                }
+            }
         }
     }
 
+    fun subscribe() = configChannel.openSubscription()
+
     override fun toString() = "Configuration(peers=$peers, folders=$folders, localDeviceName=$localDeviceName, " +
             "localDeviceId=${localDeviceId.deviceId}, discoveryServers=$discoveryServers, instanceId=$instanceId, " +
             "configFile=$configFile, databaseFolder=$databaseFolder)"

syncthing-core/src/main/kotlin/net/syncthing/java/core/exception/ExceptionReport.kt

@@ -0,0 +1,82 @@
+/*
+ * Copyright 2018 Jonas Lochmann
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package net.syncthing.java.core.exception
+
+import kotlinx.coroutines.CancellationException
+import kotlinx.coroutines.Job
+import kotlin.Exception
+
+data class ExceptionReport(
+        val component: String,
+        val exception: Exception,
+        val details: List<ExceptionDetails>
+) {
+    companion object {
+        fun fromException(exception: Exception, component: String) = ExceptionReport(
+                component,
+                exception,
+                ExceptionDetailException.getExceptionReportDetails(exception)
+        )
+    }
+
+    val detailsReadableString: String by lazy {
+        details.map { it.readableString }.joinToString("\n")
+    }
+}
+
+data class ExceptionDetails(
+        val component: String,
+        val details: String
+) {
+    val readableString: String by lazy { component + "\n" + details + "\n" }
+}
+
+class ExceptionDetailException(
+        cause: Throwable,
+        val details: ExceptionDetails
+): Exception(cause) {
+    companion object {
+        fun getExceptionReportDetails(exception: Exception): List<ExceptionDetails> {
+            val result = mutableListOf<ExceptionDetails>()
+
+            var ex: Throwable? = exception
+
+            while (ex != null) {
+                if (ex is ExceptionDetailException) {
+                    result.add(ex.details)
+                }
+
+                ex = ex.cause
+            }
+
+            return result.reversed()
+        }
+    }
+}
+
+fun Job.reportExceptions(component: String, exceptionReportHandler: (ExceptionReport) -> Unit) {
+    invokeOnCompletion {
+        if (it != null) {
+            if (it is Exception) {
+                if (it is CancellationException) {
+                    // ignore
+                } else {
+                    exceptionReportHandler(ExceptionReport.fromException(it, component))
+                }
+            } else {
+                throw it
+            }
+        }
+    }
+}

syncthing-core/src/main/kotlin/net/syncthing/java/core/interfaces/IndexRepository.kt

@@ -1,5 +1,6 @@
 /* 
  * Copyright (C) 2016 Davide Imbriaco
+ * Copyright (C) 2018 Jonas Lochmann
  *
  * This Java file is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
@@ -13,46 +14,8 @@
  */
 package net.syncthing.java.core.interfaces
 
-import net.syncthing.java.core.beans.*
 import java.io.Closeable
-import java.util.*
 
 interface IndexRepository: Closeable {
-
-    fun setOnFolderStatsUpdatedListener(listener: ((IndexRepository.FolderStatsUpdatedEvent) -> Unit)?)
-
-    fun getSequencer(): Sequencer
-
-    fun updateIndexInfo(indexInfo: IndexInfo)
-
-    fun findIndexInfoByDeviceAndFolder(deviceId: DeviceId, folder: String): IndexInfo?
-
-    fun findFileInfo(folder: String, path: String): FileInfo?
-
-    fun findFileInfoLastModified(folder: String, path: String): Date?
-
-    fun findNotDeletedFileInfo(folder: String, path: String): FileInfo?
-
-    fun findFileBlocks(folder: String, path: String): FileBlocks?
-
-    fun updateFileInfo(fileInfo: FileInfo, fileBlocks: FileBlocks?)
-
-    fun findNotDeletedFilesByFolderAndParent(folder: String, parentPath: String): List<FileInfo>
-
-    fun clearIndex()
-
-    fun findFolderStats(folder: String): FolderStats?
-
-    fun findAllFolderStats(): List<FolderStats>
-
-    fun findFileInfoBySearchTerm(query: String): List<FileInfo>
-
-    fun countFileInfoBySearchTerm(query: String): Long
-
-    abstract class FolderStatsUpdatedEvent {
-
-        abstract fun getFolderStats(): List<FolderStats>
-
-    }
-
+    fun <T> runInTransaction(action: (IndexTransaction) -> T): T
 }

syncthing-core/src/main/kotlin/net/syncthing/java/core/interfaces/IndexTransaction.kt

@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2016 Davide Imbriaco
+ * Copyright (C) 2018 Jonas Lochmann
+ *
+ * This Java file is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package net.syncthing.java.core.interfaces
+
+import net.syncthing.java.core.beans.*
+import java.util.*
+
+interface IndexTransaction {
+    fun getSequencer(): Sequencer
+
+    fun updateIndexInfo(indexInfo: IndexInfo)
+
+    fun findAllIndexInfos(): List<IndexInfo>
+
+    fun findIndexInfoByDeviceAndFolder(deviceId: DeviceId, folder: String): IndexInfo?
+
+    fun findFileInfo(folder: String, path: String): FileInfo?
+
+    // path to FileInfo
+    fun findFileInfo(folder: String, path: List<String>): Map<String, FileInfo>
+
+    fun findFileInfoLastModified(folder: String, path: String): Date?
+
+    fun findNotDeletedFileInfo(folder: String, path: String): FileInfo?
+
+    fun findFileBlocks(folder: String, path: String): FileBlocks?
+
+    fun updateFileInfo(fileInfo: FileInfo, fileBlocks: FileBlocks?)
+
+    fun updateFileInfoAndBlocks(fileInfos: List<FileInfo>, fileBlocks: List<FileBlocks>)
+
+    fun findNotDeletedFilesByFolderAndParent(folder: String, parentPath: String): List<FileInfo>
+
+    fun clearIndex()
+
+    fun findFolderStats(folder: String): FolderStats?
+
+    fun findAllFolderStats(): List<FolderStats>
+
+    fun updateOrInsertFolderStats(folder: String, deltaFileCount: Long, deltaDirCount: Long, deltaSize: Long, lastUpdate: Date)
+
+    fun findFileInfoBySearchTerm(query: String): List<FileInfo>
+
+    fun countFileInfoBySearchTerm(query: String): Long
+}

syncthing-core/src/main/kotlin/net/syncthing/java/core/interfaces/TempRepository.kt

@@ -1,5 +1,6 @@
 /* 
  * Copyright (C) 2016 Davide Imbriaco
+ * Copyright (C) 2018 Jonas Lochmann
  *
  * This Java file is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
@@ -22,4 +23,6 @@ interface TempRepository: Closeable {
     fun popTempData(key: String): ByteArray
 
     fun deleteTempData(keys: List<String>)
+
+    fun deleteAllTempData()
 }

syncthing-core/src/main/kotlin/net/syncthing/java/core/utils/ExecutorUtils.kt

@@ -1,56 +0,0 @@
-/* 
- * Copyright (C) 2016 Davide Imbriaco
- *
- * This Java file is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/.
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package net.syncthing.java.core.utils
-
-import org.slf4j.LoggerFactory
-import java.util.concurrent.ExecutorService
-import java.util.concurrent.Future
-import java.util.concurrent.RejectedExecutionException
-import java.util.concurrent.TimeUnit
-
-private val logger = LoggerFactory.getLogger(ExecutorService::class.java)
-
-fun ExecutorService.awaitTerminationSafe() {
-    try {
-        awaitTermination(2, TimeUnit.SECONDS)
-    } catch (ex: InterruptedException) {
-        logger.warn("", ex)
-    }
-}
-
-fun ExecutorService.submitLogging(runnable: Runnable) = submitLogging { runnable.run() }
-
-/**
- * Wrapper method for [[ExecutorService.submit]], which silently swallows exceptions. If an exception is thrown in
- * [[runnable]], logs the exception and force crashes
- */
-fun <T> ExecutorService.submitLogging(runnable: () -> T): Future<T> {
-    return submit<T>({
-        try {
-            runnable()
-        } catch (e: Exception) {
-            logger.error("", e)
-            System.exit(1)
-            null
-        }
-    })
-}
-
-fun ExecutorService.trySubmitLogging(runnable: Runnable) {
-    try {
-        submitLogging(runnable)
-    } catch (ex: RejectedExecutionException) {
-        logger.warn("could not submit task", ex)
-    }
-}

syncthing-core/src/main/kotlin/net/syncthing/java/core/utils/PathUtils.kt

@@ -14,6 +14,9 @@
  */
 package net.syncthing.java.core.utils
 
+import net.syncthing.java.core.exception.ExceptionDetailException
+import net.syncthing.java.core.exception.ExceptionDetails
+
 object PathUtils {
     const val ROOT_PATH = ""
     const val PATH_SEPARATOR = "/"
@@ -31,29 +34,56 @@ object PathUtils {
         return pathSegments.contains(PARENT_PATH) or pathSegments.contains(CURRENT_PATH)
     }
 
-    private fun isTrimmed(value: String) = value.trim() == value
     private fun containsWindowsPathSeparator(path: String) = path.contains(PATH_SEPARATOR_WIN)
-    private fun startsWithPathSeperator(path: String) = path.startsWith(PATH_SEPARATOR)
-    private fun isValidPath(path: String) = (!containsRelativeElements(path)) and
-            (!containsWindowsPathSeparator(path)) and
-            path.isNotEmpty() and
-            (!startsWithPathSeperator(path)) and
-            isTrimmed(path)
+    private fun startsWithPathSeparator(path: String) = path.startsWith(PATH_SEPARATOR)
 
     private fun containsPathSeparator(file: String) = file.contains(PATH_SEPARATOR) or file.contains(PATH_SEPARATOR_WIN)
-    private fun isFilenameValid(file: String) = file.isNotBlank() and
-            (!containsPathSeparator(file)) and
-            isTrimmed(file)
 
     private fun assertPathValid(path: String) {
-        if (!isValidPath(path)) {
-            throw IllegalArgumentException("provided path is invalid")
+        fun throwException(reason: String) {
+            throw ExceptionDetailException(
+                    IllegalArgumentException("provided path is invalid because it $reason"),
+                    ExceptionDetails(
+                            component = "PathUtils",
+                            details = "processed path: \"$path\""
+                    )
+            )
+        }
+
+        if (containsRelativeElements(path)) {
+            throwException("contains relative path elements")
+        }
+
+        if (containsWindowsPathSeparator(path)) {
+            throwException("contains windows path separators")
+        }
+
+        if (path.isEmpty()) {
+            throwException("is empty")
+        }
+
+        if (startsWithPathSeparator(path)) {
+            throwException("starts with a path separator")
         }
     }
 
     private fun assertFilenameValid(filename: String) {
-        if (!isFilenameValid(filename)) {
-            throw IllegalArgumentException("provided filename is invalid")
+        fun throwException(reason: String) {
+            throw ExceptionDetailException(
+                    IllegalArgumentException("provided filename is invalid because the filename $reason"),
+                    ExceptionDetails(
+                            component = "PathUtils",
+                            details = "processed filename: \"$filename\""
+                    )
+            )
+        }
+
+        if (filename.isBlank()) {
+            throwException("is blank")
+        }
+
+        if (containsPathSeparator(filename)) {
+            throwException("contains a path separator")
         }
     }
 

syncthing-discovery/src/main/kotlin/net/syncthing/java/discovery/DiscoveryHandler.kt

@@ -20,6 +20,7 @@ import kotlinx.coroutines.launch
 import net.syncthing.java.core.beans.DeviceAddress
 import net.syncthing.java.core.beans.DeviceId
 import net.syncthing.java.core.configuration.Configuration
+import net.syncthing.java.core.exception.ExceptionReport
 import net.syncthing.java.discovery.protocol.GlobalDiscoveryHandler
 import net.syncthing.java.discovery.protocol.LocalDiscoveryHandler
 import net.syncthing.java.discovery.utils.AddressRanker
@@ -27,19 +28,27 @@ import org.slf4j.LoggerFactory
 import java.io.Closeable
 import java.util.*
 
-class DiscoveryHandler(private val configuration: Configuration) : Closeable {
+class DiscoveryHandler(
+        private val configuration: Configuration,
+        exceptionReportHandler: (ExceptionReport) -> Unit
+) : Closeable {
 
     private val logger = LoggerFactory.getLogger(javaClass)
     private val globalDiscoveryHandler = GlobalDiscoveryHandler(configuration)
-    private val localDiscoveryHandler = LocalDiscoveryHandler(configuration, { message ->
-        logger.info("received device address list from local discovery")
+    private val localDiscoveryHandler = LocalDiscoveryHandler(
+            configuration,
+            exceptionReportHandler,
+            { message ->
+                logger.info("received device address list from local discovery")
 
-        GlobalScope.launch {
-            processDeviceAddressBg(message.addresses)
-        }
-    }, { deviceId ->
-        onMessageFromUnknownDeviceListeners.forEach { listener -> listener(deviceId) }
-    })
+                GlobalScope.launch {
+                    processDeviceAddressBg(message.addresses)
+                }
+            },
+            { deviceId ->
+                onMessageFromUnknownDeviceListeners.forEach { listener -> listener(deviceId) }
+            }
+    )
     val devicesAddressesManager = DevicesAddressesManager()
     private var isClosed = false
     private val onMessageFromUnknownDeviceListeners = Collections.synchronizedSet(HashSet<(DeviceId) -> Unit>())

syncthing-discovery/src/main/kotlin/net/syncthing/java/discovery/Main.kt

@@ -83,14 +83,20 @@ class Main {
     private fun queryLocalDiscovery(configuration: Configuration, deviceId: DeviceId): Collection<DeviceAddress> {
         val lock = Object()
         val discoveredAddresses = mutableListOf<DeviceAddress>()
-        val handler = LocalDiscoveryHandler(configuration, { message ->
-            synchronized(lock) {
-                if (message.deviceId == deviceId) {
-                    discoveredAddresses.addAll(message.addresses)
-                    lock.notify()
+        val handler = LocalDiscoveryHandler(
+                configuration,
+                {
+                    throw it.exception
+                },
+                { message ->
+                    synchronized(lock) {
+                        if (message.deviceId == deviceId) {
+                            discoveredAddresses.addAll(message.addresses)
+                            lock.notify()
+                        }
+                    }
                 }
-            }
-        })
+        )
         handler.startListener()
         handler.sendAnnounceMessage()
         synchronized(lock) {

syncthing-discovery/src/main/kotlin/net/syncthing/java/discovery/protocol/LocalDiscoveryHandler.kt

@@ -14,34 +14,37 @@
  */
 package net.syncthing.java.discovery.protocol
 
-import kotlinx.coroutines.GlobalScope
-import kotlinx.coroutines.Job
+import kotlinx.coroutines.*
 import kotlinx.coroutines.channels.consumeEach
-import kotlinx.coroutines.launch
 import net.syncthing.java.core.beans.DeviceId
 import net.syncthing.java.core.configuration.Configuration
+import net.syncthing.java.core.exception.ExceptionReport
+import net.syncthing.java.core.exception.reportExceptions
 import org.slf4j.LoggerFactory
 import java.io.Closeable
 import java.io.IOException
 
-internal class LocalDiscoveryHandler(private val configuration: Configuration,
-                                     private val onMessageReceivedListener: (LocalDiscoveryMessage) -> Unit,
-                                     private val onMessageFromUnknownDeviceListener: (DeviceId) -> Unit = {}) : Closeable {
+internal class LocalDiscoveryHandler(
+        private val configuration: Configuration,
+        private val exceptionReportHandler: (ExceptionReport) -> Unit,
+        private val onMessageReceivedListener: (LocalDiscoveryMessage) -> Unit,
+        private val onMessageFromUnknownDeviceListener: (DeviceId) -> Unit = {}
+) : Closeable {
 
     private val logger = LoggerFactory.getLogger(javaClass)
     private val job = Job()
 
     fun sendAnnounceMessage() {
-        GlobalScope.launch {
+        GlobalScope.async (Dispatchers.IO) {
             LocalDiscoveryUtil.sendAnnounceMessage(
                     ownDeviceId = configuration.localDeviceId,
                     instanceId = configuration.instanceId
             )
-        }
+        }.reportExceptions("LocalDiscoveryHandler.sendAnnounceMessage", exceptionReportHandler)
     }
 
     fun startListener() {
-        GlobalScope.launch (job) {
+        GlobalScope.async (job) {
             try {
                 LocalDiscoveryUtil.listenForAnnounceMessages().consumeEach { message ->
                     if (message.deviceId == configuration.localDeviceId) {
@@ -59,7 +62,7 @@ internal class LocalDiscoveryHandler(private val configuration: Configuration,
             } catch (ex: IOException) {
                 logger.warn("Failed to listen for announcement messages", ex)
             }
-        }
+        }.reportExceptions("LocalDiscoveryHandler.startListener", exceptionReportHandler)
     }
 
     override fun close() {

syncthing-discovery/src/main/kotlin/net/syncthing/java/discovery/protocol/LocalDiscoveryUtil.kt

@@ -22,11 +22,14 @@ import kotlinx.coroutines.channels.produce
 import kotlinx.coroutines.withContext
 import net.syncthing.java.core.beans.DeviceAddress
 import net.syncthing.java.core.beans.DeviceId
+import net.syncthing.java.core.exception.ExceptionDetailException
+import net.syncthing.java.core.exception.ExceptionDetails
 import net.syncthing.java.core.utils.NetworkUtils
 import org.slf4j.LoggerFactory
 import java.io.ByteArrayOutputStream
 import java.io.DataOutputStream
 import java.io.IOException
+import java.lang.Exception
 import java.net.*
 import java.nio.ByteBuffer
 
@@ -117,14 +120,24 @@ object LocalDiscoveryUtil {
                 if (broadcastAddress != null) {
                     logger.debug("sending broadcast announce on {}", broadcastAddress)
 
-                    DatagramSocket().use { broadcastSocket ->
-                        broadcastSocket.broadcast = true
+                    try {
+                        DatagramSocket().use { broadcastSocket ->
+                            broadcastSocket.broadcast = true
 
-                        broadcastSocket.send(DatagramPacket(
-                                discoveryMessage,
-                                discoveryMessage.size,
-                                broadcastAddress,
-                                LISTENING_PORT))
+                            broadcastSocket.send(DatagramPacket(
+                                    discoveryMessage,
+                                    discoveryMessage.size,
+                                    broadcastAddress,
+                                    LISTENING_PORT))
+                        }
+                    } catch (ex: Exception) {
+                        throw ExceptionDetailException(
+                                ex,
+                                ExceptionDetails(
+                                        component = "LocalDiscoveryUtil.sendAnnounceMessage",
+                                        details = "interface: $networkInterface\naddress: $interfaceAddress\nbroadcast address: $broadcastAddress"
+                                )
+                        )
                     }
                 }
             }

syncthing-repository-android/src/main/java/net/syncthing/repository/android/SqliteIndexRepository.kt

@@ -1,124 +1,32 @@
 package net.syncthing.repository.android
 
-import net.syncthing.java.core.beans.*
 import net.syncthing.java.core.interfaces.IndexRepository
-import net.syncthing.java.core.interfaces.Sequencer
+import net.syncthing.java.core.interfaces.IndexTransaction
 import net.syncthing.repository.android.database.RepositoryDatabase
-import net.syncthing.repository.android.database.item.*
-import java.util.*
+import java.util.concurrent.Callable
 
 class SqliteIndexRepository(
         private val database: RepositoryDatabase,
         private val closeDatabaseOnClose: Boolean,
         private val clearTempStorageHook: () -> Unit
 ): IndexRepository {
-    private var folderStatsChangeListener: ((IndexRepository.FolderStatsUpdatedEvent) -> Unit)? = null
 
-    // FileInfo
-    override fun findFileInfo(folder: String, path: String) = database.fileInfo().findFileInfo(folder, path)?.native
-    override fun findFileInfoBySearchTerm(query: String) = database.fileInfo().findFileInfoBySearchTerm(query).map { it.native }
-    override fun findFileInfoLastModified(folder: String, path: String): Date? = database.fileInfo().findFileInfoLastModified(folder, path)?.lastModified
-    override fun findNotDeletedFileInfo(folder: String, path: String) = database.fileInfo().findNotDeletedFileInfo(folder, path)?.native
-    override fun findNotDeletedFilesByFolderAndParent(folder: String, parentPath: String) = database.fileInfo().findNotDeletedFilesByFolderAndParent(folder, parentPath).map { it.native }
-    override fun countFileInfoBySearchTerm(query: String) = database.fileInfo().countFileInfoBySearchTerm(query)
+    override fun <T> runInTransaction(action: (IndexTransaction) -> T): T {
+            return database.runInTransaction (object: Callable<T> {
+                override fun call(): T {
+                    val transaction = SqliteTransaction(
+                            database = database,
+                            threadId = Thread.currentThread().id,
+                            clearTempStorageHook = clearTempStorageHook
+                    )
 
-    override fun updateFileInfo(fileInfo: FileInfo, fileBlocks: FileBlocks?) {
-        val newFileInfo = fileInfo
-        val newFileBlocks = fileBlocks
-
-        database.runInTransaction {
-            if (newFileBlocks != null) {
-                FileInfo.checkBlocks(newFileInfo, newFileBlocks)
-
-                database.fileBlocks().mergeBlock(FileBlocksItem.fromNative(newFileBlocks))
-            }
-
-            val oldFileInfo = findFileInfo(newFileInfo.folder, newFileInfo.path)
-
-            database.fileInfo().updateFileInfo(FileInfoItem.fromNative(newFileInfo))
-
-            //update stats
-            var deltaFileCount = 0L
-            var deltaDirCount= 0L
-            var deltaSize = 0L
-            val oldMissing = oldFileInfo == null || oldFileInfo.isDeleted
-            val newMissing = newFileInfo.isDeleted
-            val oldSizeMissing = oldMissing || !oldFileInfo!!.isFile()
-            val newSizeMissing = newMissing || !newFileInfo.isFile()
-            if (!oldSizeMissing) {
-                deltaSize -= oldFileInfo!!.size!!
-            }
-            if (!newSizeMissing) {
-                deltaSize += newFileInfo.size!!
-            }
-            if (!oldMissing) {
-                if (oldFileInfo!!.isFile()) {
-                    deltaFileCount--
-                } else if (oldFileInfo.isDirectory()) {
-                    deltaDirCount--
-                }
-            }
-            if (!newMissing) {
-                if (newFileInfo.isFile()) {
-                    deltaFileCount++
-                } else if (newFileInfo.isDirectory()) {
-                    deltaDirCount++
-                }
-            }
-
-            val newFolderStats = kotlin.run {
-                val updatedRows = database.folderStats().updateFolderStats(
-                        folder = newFileInfo.folder,
-                        deltaDirCount = deltaDirCount,
-                        deltaFileCount = deltaFileCount,
-                        deltaSize = deltaSize,
-                        lastUpdate = newFileInfo.lastModified
-                )
-
-                if (updatedRows == 0L) {
-                    database.folderStats().insertFolderStats(FolderStatsItem(
-                            folder = newFileInfo.folder,
-                            dirCount = deltaDirCount,
-                            fileCount = deltaFileCount,
-                            size = deltaSize,
-                            lastUpdate = newFileInfo.lastModified
-                    ))
-                }
-
-                database.folderStats().getFolderStats(newFileInfo.folder)!!
-            }
-
-            folderStatsChangeListener?.invoke(object : IndexRepository.FolderStatsUpdatedEvent() {
-                override fun getFolderStats(): List<FolderStats> {
-                    return listOf(newFolderStats.native)
+                    return try {
+                        action(transaction)
+                    } finally {
+                        transaction.markFinished()
+                    }
                 }
             })
-        }
-    }
-
-    // FileBlocks
-
-    override fun findFileBlocks(folder: String, path: String) = database.fileBlocks().findFileBlocks(folder, path)?.native
-
-    // FolderStats
-
-    override fun findAllFolderStats() = database.folderStats().findAllFolderStats().map { it.native }
-
-    override fun findFolderStats(folder: String): FolderStats? = database.folderStats().findFolderStats(folder)?.native
-
-    // IndexInfo
-
-    override fun updateIndexInfo(indexInfo: IndexInfo) {
-        database.folderIndexInfo().updateIndexInfo(FolderIndexInfoItem.fromNative(indexInfo))
-    }
-
-    override fun findIndexInfoByDeviceAndFolder(deviceId: DeviceId, folder: String): IndexInfo? = database.folderIndexInfo().findIndexInfoByDeviceAndFolder(deviceId, folder)?.native
-
-    // managment
-
-    override fun clearIndex() {
-        database.clearAllTables()
-        clearTempStorageHook()
     }
 
     override fun close() {
@@ -126,39 +34,4 @@ class SqliteIndexRepository(
             database.close()
         }
     }
-
-    // other
-    private val sequencer = object: Sequencer {
-        fun getDatabaseEntry(): IndexSequenceItem {
-            val entry = database.indexSequence().getItem()
-
-            if (entry != null) {
-                return entry
-            }
-
-            val newEntry = IndexSequenceItem(
-                    indexId = Math.abs(Random().nextLong()) + 1,
-                    currentSequence = Math.abs(Random().nextLong()) + 1
-            )
-
-            database.indexSequence().createItem(newEntry)
-
-            return newEntry
-        }
-
-        override fun indexId() = getDatabaseEntry().indexId
-        override fun currentSequence() = getDatabaseEntry().currentSequence
-
-        override fun nextSequence(): Long {
-            database.indexSequence().incrementSequenceNumber(indexId())
-
-            return currentSequence()
-        }
-    }
-
-    override fun getSequencer() = sequencer
-
-    override fun setOnFolderStatsUpdatedListener(listener: ((IndexRepository.FolderStatsUpdatedEvent) -> Unit)?) {
-        folderStatsChangeListener = listener
-    }
 }

syncthing-repository-android/src/main/java/net/syncthing/repository/android/SqliteTransaction.kt

@@ -0,0 +1,169 @@
+package net.syncthing.repository.android
+
+import net.syncthing.java.core.beans.*
+import net.syncthing.java.core.interfaces.IndexTransaction
+import net.syncthing.java.core.interfaces.Sequencer
+import net.syncthing.repository.android.database.RepositoryDatabase
+import net.syncthing.repository.android.database.item.*
+import java.util.*
+
+class SqliteTransaction(
+        private val database: RepositoryDatabase,
+        private val threadId: Long,
+        private val clearTempStorageHook: () -> Unit
+): IndexTransaction {
+    private var finished = false
+
+    private fun assertAllowed() {
+        if (finished) {
+            throw IllegalStateException("tried to use a transaction which is already done")
+        }
+
+        if (Thread.currentThread().id != threadId) {
+            throw IllegalStateException("tried to access the transaction from an other Thread")
+        }
+    }
+
+    fun markFinished() {
+        finished = true
+    }
+
+    private fun <T> runIfAllowed(block: () -> T): T {
+        assertAllowed()
+
+        return block()
+    }
+
+    // FileInfo
+    override fun findFileInfo(folder: String, path: String) = runIfAllowed {
+        database.fileInfo().findFileInfo(folder, path)?.native
+    }
+
+    override fun findFileInfo(folder: String, path: List<String>): Map<String, FileInfo> = runIfAllowed {
+        database.fileInfo().findFileInfo(folder, path)
+                .map { it.native }
+                .associateBy { it.path }
+    }
+
+    override fun findFileInfoBySearchTerm(query: String) = runIfAllowed {
+        database.fileInfo().findFileInfoBySearchTerm(query).map { it.native }
+    }
+
+    override fun findFileInfoLastModified(folder: String, path: String): Date? = runIfAllowed {
+        database.fileInfo().findFileInfoLastModified(folder, path)?.lastModified
+    }
+
+    override fun findNotDeletedFileInfo(folder: String, path: String) = runIfAllowed {
+        database.fileInfo().findNotDeletedFileInfo(folder, path)?.native
+    }
+
+    override fun findNotDeletedFilesByFolderAndParent(folder: String, parentPath: String) = runIfAllowed {
+        database.fileInfo().findNotDeletedFilesByFolderAndParent(folder, parentPath).map { it.native }
+    }
+
+    override fun countFileInfoBySearchTerm(query: String) = runIfAllowed {
+        database.fileInfo().countFileInfoBySearchTerm(query)
+    }
+
+    override fun updateFileInfo(fileInfo: FileInfo, fileBlocks: FileBlocks?) = runIfAllowed {
+        if (fileBlocks != null) {
+            FileInfo.checkBlocks(fileInfo, fileBlocks)
+
+            database.fileBlocks().mergeBlock(FileBlocksItem.fromNative(fileBlocks))
+        }
+
+        database.fileInfo().updateFileInfo(FileInfoItem.fromNative(fileInfo))
+    }
+
+    override fun updateFileInfoAndBlocks(fileInfos: List<FileInfo>, fileBlocks: List<FileBlocks>) = runIfAllowed {
+        if (fileInfos.isNotEmpty()) {
+            database.fileInfo().updateFileInfo(fileInfos.map { FileInfoItem.fromNative(it) })
+        }
+
+        if (fileBlocks.isNotEmpty()) {
+            database.fileBlocks().mergeBlocks(fileBlocks.map { FileBlocksItem.fromNative(it) })
+        }
+    }
+
+    // FileBlocks
+
+    override fun findFileBlocks(folder: String, path: String) = runIfAllowed {
+        database.fileBlocks().findFileBlocks(folder, path)?.native
+    }
+
+    // FolderStats
+
+    override fun findAllFolderStats() = runIfAllowed {
+        database.folderStats().findAllFolderStats().map { it.native }
+    }
+
+    override fun findFolderStats(folder: String): FolderStats? = runIfAllowed {
+        database.folderStats().findFolderStats(folder)?.native
+    }
+
+    override fun updateOrInsertFolderStats(
+            folder: String,
+            deltaFileCount: Long,
+            deltaDirCount: Long,
+            deltaSize: Long,
+            lastUpdate: Date
+    ) = runIfAllowed {
+        if (database.folderStats().updateFolderStats(folder, deltaFileCount, deltaDirCount, deltaSize, lastUpdate) == 0L) {
+            database.folderStats().insertFolderStats(FolderStatsItem(folder, deltaFileCount, deltaDirCount, lastUpdate, deltaSize))
+        }
+    }
+
+    // IndexInfo
+
+    override fun updateIndexInfo(indexInfo: IndexInfo) = runIfAllowed {
+        database.folderIndexInfo().updateIndexInfo(FolderIndexInfoItem.fromNative(indexInfo))
+    }
+
+    override fun findIndexInfoByDeviceAndFolder(deviceId: DeviceId, folder: String): IndexInfo? = runIfAllowed {
+        database.folderIndexInfo().findIndexInfoByDeviceAndFolder(deviceId, folder)?.native
+    }
+
+    override fun findAllIndexInfos(): List<IndexInfo> = runIfAllowed {
+        database.folderIndexInfo().findAllIndexInfo().map { it.native }
+    }
+
+    // managment
+
+    override fun clearIndex() {
+        runIfAllowed {
+            database.clearAllTables()
+            clearTempStorageHook()
+        }
+    }
+
+    // other
+    private val sequencer = object: Sequencer {
+        private fun getDatabaseEntry(): IndexSequenceItem {
+            val entry = database.indexSequence().getItem()
+
+            if (entry != null) {
+                return entry
+            }
+
+            val newEntry = IndexSequenceItem(
+                    indexId = Math.abs(Random().nextLong()) + 1,
+                    currentSequence = Math.abs(Random().nextLong()) + 1
+            )
+
+            database.indexSequence().createItem(newEntry)
+
+            return newEntry
+        }
+
+        override fun indexId() = runIfAllowed { getDatabaseEntry().indexId }
+        override fun currentSequence() = runIfAllowed { getDatabaseEntry().currentSequence }
+
+        override fun nextSequence(): Long = runIfAllowed {
+            database.indexSequence().incrementSequenceNumber(indexId())
+
+            currentSequence()
+        }
+    }
+
+    override fun getSequencer() = sequencer
+}

syncthing-repository-android/src/main/java/net/syncthing/repository/android/TempDirectoryLocalRepository.kt

@@ -1,3 +1,16 @@
+/*
+ * Copyright (C) 2018 Jonas Lochmann
+ *
+ * This Java file is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package net.syncthing.repository.android
 
 import net.syncthing.java.core.interfaces.TempRepository
@@ -14,7 +27,7 @@ class TempDirectoryLocalRepository(private val directory: File): TempRepository
         directory.mkdirs()
 
         // there could be garbage from the previous session which we don't need anymore
-        deleteAllData()
+        deleteAllTempData()
     }
 
     override fun pushTempData(data: ByteArray): String {
@@ -59,10 +72,10 @@ class TempDirectoryLocalRepository(private val directory: File): TempRepository
     }
 
     override fun close() {
-        deleteAllData()
+        deleteAllTempData()
     }
 
-    fun deleteAllData() {
+    override fun deleteAllTempData() {
         directory.listFiles().forEach { file ->
             if (file.isFile) {
                 file.delete()

syncthing-repository-android/src/main/java/net/syncthing/repository/android/database/dao/FileBlocksDao.kt

@@ -13,4 +13,7 @@ interface FileBlocksDao {
 
     @Insert(onConflict = OnConflictStrategy.REPLACE)
     fun mergeBlock(blocksItem: FileBlocksItem)
+
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    fun mergeBlocks(blocksItem: List<FileBlocksItem>)
 }