http2: fix h2-over-h2 connection proxying

PR-URL: #52368
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Paolo Insogna <paolo@cowtech.it>
Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>

Author: pimterry

lib/internal/http2/core.js

@@ -177,6 +177,7 @@ const {
   kUpdateTimer,
   kHandle,
   kSession,
+  kBoundSession,
   setStreamTimeout,
 } = require('internal/stream_base_commons');
 const { kTimeout } = require('internal/timers');
@@ -1121,7 +1122,7 @@ function cleanupSession(session) {
   if (handle)
     handle.ondone = null;
   if (socket) {
-    socket[kSession] = undefined;
+    socket[kBoundSession] = undefined;
     socket[kServer] = undefined;
   }
 }
@@ -1235,10 +1236,10 @@ class Http2Session extends EventEmitter {
     // If the session property already exists on the socket,
     // then it has already been bound to an Http2Session instance
     // and cannot be attached again.
-    if (socket[kSession] !== undefined)
+    if (socket[kBoundSession] !== undefined)
       throw new ERR_HTTP2_SOCKET_BOUND();
 
-    socket[kSession] = this;
+    socket[kBoundSession] = this;
 
     if (!socket._handle || !socket._handle.isStreamBase) {
       socket = new JSStreamSocket(socket);
@@ -1617,7 +1618,7 @@ class Http2Session extends EventEmitter {
   }
 
   _onTimeout() {
-    callTimeout(this);
+    callTimeout(this, this);
   }
 
   ref() {
@@ -2093,7 +2094,7 @@ class Http2Stream extends Duplex {
   }
 
   _onTimeout() {
-    callTimeout(this, kSession);
+    callTimeout(this, this[kSession]);
   }
 
   // True if the HEADERS frame has been sent
@@ -2419,7 +2420,7 @@ class Http2Stream extends Duplex {
   }
 }
 
-function callTimeout(self, kSession) {
+function callTimeout(self, session) {
   // If the session is destroyed, this should never actually be invoked,
   // but just in case...
   if (self.destroyed)
@@ -2430,7 +2431,7 @@ function callTimeout(self, kSession) {
   // happens, meaning that if a write is ongoing it should never equal the
   // newly fetched, updated value.
   if (self[kState].writeQueueSize > 0) {
-    const handle = kSession ? self[kSession][kHandle] : self[kHandle];
+    const handle = session[kHandle];
     const chunksSentSinceLastWrite = handle !== undefined ?
       handle.chunksSentSinceLastWrite : null;
     if (chunksSentSinceLastWrite !== null &&
@@ -3017,7 +3018,7 @@ ObjectDefineProperty(Http2Session.prototype, 'setTimeout', setTimeoutValue);
 // When the socket emits an error, destroy the associated Http2Session and
 // forward it the same error.
 function socketOnError(error) {
-  const session = this[kSession];
+  const session = this[kBoundSession];
   if (session !== undefined) {
     // We can ignore ECONNRESET after GOAWAY was received as there's nothing
     // we can do and the other side is fully within its rights to do so.
@@ -3300,7 +3301,7 @@ function setupCompat(ev) {
 }
 
 function socketOnClose() {
-  const session = this[kSession];
+  const session = this[kBoundSession];
   if (session !== undefined) {
     debugSessionObj(session, 'socket closed');
     const err = session.connecting ? new ERR_SOCKET_CLOSED() : null;

lib/internal/js_stream_socket.js

@@ -17,7 +17,7 @@ let debug = require('internal/util/debuglog').debuglog(
 );
 const { owner_symbol } = require('internal/async_hooks').symbols;
 const { ERR_STREAM_WRAP } = require('internal/errors').codes;
-const { kSession } = require('internal/stream_base_commons');
+const { kBoundSession } = require('internal/stream_base_commons');
 
 const kCurrentWriteRequest = Symbol('kCurrentWriteRequest');
 const kCurrentShutdownRequest = Symbol('kCurrentShutdownRequest');
@@ -265,12 +265,12 @@ class JSStreamSocket extends Socket {
     });
   }
 
-  get [kSession]() {
-    return this.stream[kSession];
+  get [kBoundSession]() {
+    return this.stream[kBoundSession];
   }
 
-  set [kSession](session) {
-    this.stream[kSession] = session;
+  set [kBoundSession](session) {
+    this.stream[kBoundSession] = session;
   }
 }
 

lib/internal/stream_base_commons.js

@@ -33,6 +33,7 @@ const kMaybeDestroy = Symbol('kMaybeDestroy');
 const kUpdateTimer = Symbol('kUpdateTimer');
 const kAfterAsyncWrite = Symbol('kAfterAsyncWrite');
 const kHandle = Symbol('kHandle');
+const kBoundSession = Symbol('kBoundSession');
 const kSession = Symbol('kSession');
 
 let debug = require('internal/util/debuglog').debuglog('stream', (fn) => {
@@ -255,6 +256,7 @@ function setStreamTimeout(msecs, callback) {
   } else {
     this[kTimeout] = setUnrefTimeout(this._onTimeout.bind(this), msecs);
     if (this[kSession]) this[kSession][kUpdateTimer]();
+    if (this[kBoundSession]) this[kBoundSession][kUpdateTimer]();
 
     if (callback !== undefined) {
       validateFunction(callback, 'callback');

test/parallel/test-http2-client-proxy-over-http2.js

@@ -0,0 +1,50 @@
+'use strict';
+
+const common = require('../common');
+if (!common.hasCrypto)
+  common.skip('missing crypto');
+const assert = require('assert');
+const h2 = require('http2');
+
+const server = h2.createServer();
+
+server.listen(0, common.mustCall(function() {
+  const proxyClient = h2.connect(`http://localhost:${server.address().port}`);
+
+  const request = proxyClient.request({
+    ':method': 'CONNECT',
+    ':authority': 'example.com:80'
+  });
+
+  request.on('response', common.mustCall((connectResponse) => {
+    assert.strictEqual(connectResponse[':status'], 200);
+
+    const proxiedClient = h2.connect('http://example.com', {
+      createConnection: () => request // Tunnel via first request stream
+    });
+
+    const proxiedRequest = proxiedClient.request();
+    proxiedRequest.on('response', common.mustCall((proxiedResponse) => {
+      assert.strictEqual(proxiedResponse[':status'], 204);
+
+      proxiedClient.close();
+      proxyClient.close();
+      server.close();
+    }));
+  }));
+}));
+
+server.once('connect', common.mustCall((req, res) => {
+  assert.strictEqual(req.headers[':method'], 'CONNECT');
+  res.writeHead(200); // Accept the CONNECT tunnel
+
+  // Handle this stream as a new 'proxied' connection (pretend to forward
+  // but actually just unwrap the tunnel ourselves):
+  server.emit('connection', res.stream);
+}));
+
+// Handle the 'proxied' request itself:
+server.once('request', common.mustCall((req, res) => {
+  res.writeHead(204);
+  res.end();
+}));