http2: report sent headers object in client stream dcs

This change improves diagnosis by reporting the headers object that is
actually sent rather than the original input headers in the following
diagnostics channels:
- 'http2.client.stream.created'
- 'http2.client.stream.start'

Signed-off-by: Darshan Sen <raisinten@gmail.com>
PR-URL: #59419
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: RaisinTen

lib/internal/http2/core.js

@@ -760,7 +760,7 @@ const deprecateWeight = deprecateProperty('weight',
 // When a ClientHttp2Session is first created, the socket may not yet be
 // connected. If request() is called during this time, the actual request
 // will be deferred until the socket is ready to go.
-function requestOnConnect(headersList, headersParam, options) {
+function requestOnConnect(headersList, options) {
   const session = this[kSession];
 
   // At this point, the stream should have already been destroyed during
@@ -824,7 +824,7 @@ function requestOnConnect(headersList, headersParam, options) {
   if (onClientStreamStartChannel.hasSubscribers) {
     onClientStreamStartChannel.publish({
       stream: this,
-      headers: headersParam,
+      headers: this.sentHeaders,
     });
   }
 }
@@ -1888,7 +1888,7 @@ class ClientHttp2Session extends Http2Session {
       }
     }
 
-    const onConnect = reqAsync.bind(requestOnConnect.bind(stream, headersList, headersParam, options));
+    const onConnect = reqAsync.bind(requestOnConnect.bind(stream, headersList, options));
     if (this.connecting) {
       if (this[kPendingRequestCalls] !== null) {
         this[kPendingRequestCalls].push(onConnect);
@@ -1906,7 +1906,7 @@ class ClientHttp2Session extends Http2Session {
     if (onClientStreamCreatedChannel.hasSubscribers) {
       onClientStreamCreatedChannel.publish({
         stream,
-        headers: headersParam,
+        headers: stream.sentHeaders,
       });
     }
 

test/parallel/test-diagnostics-channel-http2-client-stream-created.js

@@ -18,36 +18,61 @@ const { Duplex } = require('stream');
 
 const clientHttp2StreamCreationCount = 2;
 
+let countdown;
+let port;
+
 dc.subscribe('http2.client.stream.created', common.mustCall(({ stream, headers }) => {
   // Since ClientHttp2Stream is not exported from any module, this just checks
   // if the stream is an instance of Duplex and the constructor name is
   // 'ClientHttp2Stream'.
   assert.ok(stream instanceof Duplex);
   assert.strictEqual(stream.constructor.name, 'ClientHttp2Stream');
   assert.ok(headers && !Array.isArray(headers) && typeof headers === 'object');
+  if (countdown.remaining === clientHttp2StreamCreationCount) {
+    // The request stream headers.
+    assert.deepStrictEqual(headers, {
+      '__proto__': null,
+      ':method': 'GET',
+      ':authority': `localhost:${port}`,
+      ':scheme': 'http',
+      ':path': '/',
+      'requestHeader': 'requestValue',
+    });
+  } else {
+    // The push stream headers.
+    assert.deepStrictEqual(headers, {
+      '__proto__': null,
+      ':method': 'GET',
+      ':authority': `localhost:${port}`,
+      ':scheme': 'http',
+      ':path': '/',
+      [http2.sensitiveHeaders]: [],
+      'pushheader': 'pushValue',
+    });
+  }
 }, clientHttp2StreamCreationCount));
 
 const server = http2.createServer();
 server.on('stream', common.mustCall((stream) => {
   stream.respond();
   stream.end();
 
-  stream.pushStream({}, common.mustSucceed((pushStream) => {
+  stream.pushStream({ 'pushHeader': 'pushValue' }, common.mustSucceed((pushStream) => {
     pushStream.respond();
     pushStream.end();
   }, 1));
 }, 1));
 
 server.listen(0, common.mustCall(() => {
-  const port = server.address().port;
+  port = server.address().port;
   const client = http2.connect(`http://localhost:${port}`);
 
-  const countdown = new Countdown(clientHttp2StreamCreationCount, () => {
+  countdown = new Countdown(clientHttp2StreamCreationCount, () => {
     client.close();
     server.close();
   });
 
-  const stream = client.request({});
+  const stream = client.request(['requestHeader', 'requestValue']);
   stream.on('response', common.mustCall(() => {
     countdown.dec();
   }));

test/parallel/test-diagnostics-channel-http2-client-stream-start.js

@@ -18,35 +18,61 @@ const { Duplex } = require('stream');
 
 const clientHttp2StreamStartCount = 2;
 
+let countdown;
+let port;
+
 dc.subscribe('http2.client.stream.start', common.mustCall(({ stream, headers }) => {
   // Since ClientHttp2Stream is not exported from any module, this just checks
   // if the stream is an instance of Duplex.
   assert.ok(stream instanceof Duplex);
   assert.strictEqual(stream.constructor.name, 'ClientHttp2Stream');
   assert.ok(headers && !Array.isArray(headers) && typeof headers === 'object');
+
+  if (countdown.remaining === clientHttp2StreamStartCount) {
+    // The request stream headers.
+    assert.deepStrictEqual(headers, {
+      '__proto__': null,
+      ':method': 'GET',
+      ':authority': `localhost:${port}`,
+      ':scheme': 'http',
+      ':path': '/',
+      'requestHeader': 'requestValue',
+    });
+  } else {
+    // The push stream headers.
+    assert.deepStrictEqual(headers, {
+      '__proto__': null,
+      ':method': 'GET',
+      ':authority': `localhost:${port}`,
+      ':scheme': 'http',
+      ':path': '/',
+      [http2.sensitiveHeaders]: [],
+      'pushheader': 'pushValue',
+    });
+  }
 }, clientHttp2StreamStartCount));
 
 const server = http2.createServer();
 server.on('stream', common.mustCall((stream) => {
   stream.respond();
   stream.end();
 
-  stream.pushStream({}, common.mustSucceed((pushStream) => {
+  stream.pushStream({ 'pushHeader': 'pushValue' }, common.mustSucceed((pushStream) => {
     pushStream.respond();
     pushStream.end();
   }, 1));
 }, 1));
 
 server.listen(0, common.mustCall(() => {
-  const port = server.address().port;
+  port = server.address().port;
   const client = http2.connect(`http://localhost:${port}`);
 
-  const countdown = new Countdown(clientHttp2StreamStartCount, () => {
+  countdown = new Countdown(clientHttp2StreamStartCount, () => {
     client.close();
     server.close();
   });
 
-  const stream = client.request({});
+  const stream = client.request(['requestHeader', 'requestValue']);
   stream.on('response', common.mustCall(() => {
     countdown.dec();
   }));