mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Ramanpreet Nara
39d67737c0
Summary:
If a NativeModule requires main queue setup, its `getConstants()` method must be executed on the main thead. The legacy NativeModule infra takes care of this for us. With TurboModules, however, all synchronous methods, including `getConstants()`, execute on the JS thread. Therefore, if a TurboModule requires main queue setup, and exports constants, we must execute its `getConstants()` method body on the main queue explicitly.
**Notes:**
- The changes in this diff should be a noop when TurboModules is off, because `RCTUnsafeExecuteOnMainQueueSync` synchronously execute its block on the current thread if the current thread is the main thread.
- If a NativeModule doens't have the `requiresMainQueueSetup` method, but has the `constantsToExport` method, both NativeModules and TurboModules assume that it requires main queue setup.
## Script
```
const exec = require("../lib/exec");
const abspath = require("../lib/abspath");
const relpath = require("../lib/relpath");
const readFile = (filename) => require("fs").readFileSync(filename, "utf8");
const writeFile = (filename, content) =>
require("fs").writeFileSync(filename, content);
function main() {
const tmFiles = exec("cd ~/fbsource && xbgs -n 10000 -l constantsToExport")
.split("\n")
.filter(Boolean);
const filesWithoutConstantsToExport = [];
const filesWithConstantsToExportButNotGetConstants = [];
const filesExplicitlyNotRequiringMainQueueSetup = [];
tmFiles
.filter((filename) => {
if (filename.includes("microsoft-fork-of-react-native")) {
return false;
}
return /\.mm?$/.test(filename);
})
.map(abspath)
.forEach((filename) => {
const code = readFile(filename);
const relFilename = relpath(filename);
if (!/constantsToExport\s*{/.test(code)) {
filesWithoutConstantsToExport.push(relFilename);
return;
}
if (!/getConstants\s*{/.test(code)) {
filesWithConstantsToExportButNotGetConstants.push(relFilename);
return;
}
if (/requiresMainQueueSetup\s*{/.test(code)) {
const requiresMainQueueSetupRegex = /requiresMainQueueSetup\s*{\s*return\s+(?<requiresMainQueueSetup>YES|NO)/;
const requiresMainQueueSetupRegexMatch = requiresMainQueueSetupRegex.exec(
code
);
if (!requiresMainQueueSetupRegexMatch) {
throw new Error(
"Detected requiresMainQueueSetup method in file " +
relFilename +
" but was unable to parse the method return value"
);
}
const {
requiresMainQueueSetup,
} = requiresMainQueueSetupRegexMatch.groups;
if (requiresMainQueueSetup == "NO") {
filesExplicitlyNotRequiringMainQueueSetup.push(relFilename);
return;
}
}
const getConstantsTypeRegex = () => /-\s*\((?<type>.*)\)getConstants\s*{/;
const getConstantsTypeRegexMatch = getConstantsTypeRegex().exec(code);
if (!getConstantsTypeRegexMatch) {
throw new Error(
`Failed to parse return type of getConstants method in file ${relFilename}`
);
}
const getConstantsType = getConstantsTypeRegexMatch.groups.type;
const getConstantsBody = code
.split(getConstantsTypeRegex())[2]
.split("\n}")[0];
const newGetConstantsBody = `
__block ${getConstantsType} constants;
RCTUnsafeExecuteOnMainQueueSync(^{${getConstantsBody
.replace(/\n/g, "\n ")
.replace(/_bridge/g, "self->_bridge")
.replace(/return /g, "constants = ")}
});
return constants;
`;
writeFile(
filename,
code
.replace(getConstantsBody, newGetConstantsBody)
.replace("#import", "#import <React/RCTUtils.h>\n#import")
);
});
console.log("Files without constantsToExport: ");
filesWithoutConstantsToExport.forEach((file) => console.log(file));
console.log();
console.log("Files with constantsToExport but no getConstants: ");
filesWithConstantsToExportButNotGetConstants.forEach((file) =>
console.log(file)
);
console.log();
console.log("Files with requiresMainQueueSetup = NO: ");
filesExplicitlyNotRequiringMainQueueSetup.forEach((file) =>
console.log(file)
);
}
if (!module.parent) {
main();
}
```
Changelog: [Internal]
Reviewed By: fkgozali
Differential Revision: D21797048
fbshipit-source-id: a822a858fecdbe976e6197f8339e509dc7cd917f
158 lines
4.0 KiB
Plaintext
158 lines
4.0 KiB
Plaintext
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#import "RCTAppState.h"
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#import <FBReactNativeSpec/FBReactNativeSpec.h>
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#import <React/RCTAssert.h>
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#import <React/RCTBridge.h>
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#import <React/RCTEventDispatcher.h>
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#import <React/RCTUtils.h>
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#import "CoreModulesPlugins.h"
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static NSString *RCTCurrentAppState()
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{
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static NSDictionary *states;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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states = @{@(UIApplicationStateActive) : @"active", @(UIApplicationStateBackground) : @"background"};
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});
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if (RCTRunningInAppExtension()) {
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return @"extension";
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}
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return states[@(RCTSharedApplication().applicationState)] ?: @"unknown";
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}
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@interface RCTAppState () <NativeAppStateSpec>
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@end
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@implementation RCTAppState {
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NSString *_lastKnownState;
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}
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RCT_EXPORT_MODULE()
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+ (BOOL)requiresMainQueueSetup
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{
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return YES;
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}
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- (dispatch_queue_t)methodQueue
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{
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return dispatch_get_main_queue();
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}
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- (facebook::react::ModuleConstants<JS::NativeAppState::Constants>)constantsToExport
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{
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return (facebook::react::ModuleConstants<JS::NativeAppState::Constants>)[self getConstants];
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}
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- (facebook::react::ModuleConstants<JS::NativeAppState::Constants>)getConstants
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{
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__block facebook::react::ModuleConstants<JS::NativeAppState::Constants> constants;
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RCTUnsafeExecuteOnMainQueueSync(^{
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constants = facebook::react::typedConstants<JS::NativeAppState::Constants>({
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.initialAppState = RCTCurrentAppState(),
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});
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});
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return constants;
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}
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#pragma mark - Lifecycle
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- (NSArray<NSString *> *)supportedEvents
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{
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return @[ @"appStateDidChange", @"memoryWarning" ];
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}
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- (void)startObserving
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{
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for (NSString *name in @[
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UIApplicationDidBecomeActiveNotification,
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UIApplicationDidEnterBackgroundNotification,
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UIApplicationDidFinishLaunchingNotification,
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UIApplicationWillResignActiveNotification,
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UIApplicationWillEnterForegroundNotification
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]) {
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(handleAppStateDidChange:)
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name:name
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object:nil];
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}
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(handleMemoryWarning)
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name:UIApplicationDidReceiveMemoryWarningNotification
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object:nil];
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}
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- (void)stopObserving
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{
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[[NSNotificationCenter defaultCenter] removeObserver:self];
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}
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- (void)invalidate
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{
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[self stopObserving];
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}
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#pragma mark - App Notification Methods
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- (void)handleMemoryWarning
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{
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if (self.bridge) {
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[self sendEventWithName:@"memoryWarning" body:nil];
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}
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}
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- (void)handleAppStateDidChange:(NSNotification *)notification
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{
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NSString *newState;
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if ([notification.name isEqualToString:UIApplicationWillResignActiveNotification]) {
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newState = @"inactive";
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} else if ([notification.name isEqualToString:UIApplicationWillEnterForegroundNotification]) {
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newState = @"background";
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} else {
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newState = RCTCurrentAppState();
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}
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if (![newState isEqualToString:_lastKnownState]) {
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_lastKnownState = newState;
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if (self.bridge) {
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[self sendEventWithName:@"appStateDidChange" body:@{@"app_state" : _lastKnownState}];
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}
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}
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}
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#pragma mark - Public API
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/**
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* Get the current background/foreground state of the app
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*/
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RCT_EXPORT_METHOD(getCurrentAppState : (RCTResponseSenderBlock)callback error : (__unused RCTResponseSenderBlock)error)
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{
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callback(@[ @{@"app_state" : RCTCurrentAppState()} ]);
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}
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- (std::shared_ptr<facebook::react::TurboModule>)getTurboModule:
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(const facebook::react::ObjCTurboModule::InitParams &)params
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{
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return std::make_shared<facebook::react::NativeAppStateSpecJSI>(params);
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}
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@end
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Class RCTAppStateCls(void)
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{
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return RCTAppState.class;
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}
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