From d10eedea4f4920cfaab50cb51a5a6389d50f6061 Mon Sep 17 00:00:00 2001
From: Sheetal Nandi <shkamat@microsoft.com>
Date: Tue, 1 May 2018 15:28:24 -0700
Subject: [PATCH] Log the cancellation request responses.

---
 src/tsserver/server.ts | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/src/tsserver/server.ts b/src/tsserver/server.ts
index 7e3fd4b16f1..ab02159799a 100644
--- a/src/tsserver/server.ts
+++ b/src/tsserver/server.ts
@@ -915,7 +915,23 @@ namespace ts.server {
     let cancellationToken: ServerCancellationToken;
     try {
         const factory = require("./cancellationToken");
-        cancellationToken = factory(sys.args);
+        const original: ServerCancellationToken = factory(sys.args);
+        let request: number | undefined;
+        cancellationToken = logger.hasLevel(LogLevel.verbose) ? {
+            isCancellationRequested: () => {
+                const result = original.isCancellationRequested();
+                logger.info(`isCancellationRequested: ${request}: ${result}`);
+                return result;
+            },
+            setRequest: requestId => {
+                request = requestId;
+                original.setRequest(requestId);
+            },
+            resetRequest: requestId => {
+                request = undefined;
+                original.resetRequest(requestId);
+            }
+        } : original;
     }
     catch (e) {
         cancellationToken = nullCancellationToken;