http: fix request with option timeout and agent

When request with both timeout and agent, timeout not
work. This patch will fix it, socket timeout will set
to request timeout before socket is connected, and
socket timeout will reset to agent timeout after
response end.

Fixes: https://github.com/nodejs/node/issues/21185

PR-URL: https://github.com/nodejs/node/pull/21204
Reviewed-By: Khaidi Chu <i@2333.moe>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ujjwal Sharma <usharma1998@gmail.com>

3 files changed, 66 insertions, 42 deletions

diff --git a/lib/_http_agent.js b/lib/_http_agent.js
index 67f3d667b2..1a2920cf09 100644
--- a/lib/_http_agent.js
+++ b/lib/_http_agent.js
@@ -66,7 +66,8 @@ function Agent(options) {
 
     if (socket.writable &&
         this.requests[name] && this.requests[name].length) {
-      this.requests[name].shift().onSocket(socket);
+      const req = this.requests[name].shift();
+      setRequestSocket(this, req, socket);
       if (this.requests[name].length === 0) {
         // don't leak
         delete this.requests[name];
@@ -176,12 +177,12 @@ Agent.prototype.addRequest = function addRequest(req, options, port/* legacy */,
       delete this.freeSockets[name];
 
     this.reuseSocket(socket, req);
-    req.onSocket(socket);
+    setRequestSocket(this, req, socket);
     this.sockets[name].push(socket);
   } else if (sockLen < this.maxSockets) {
     debug('call onSocket', sockLen, freeLen);
     // If we are under maxSockets create a new one.
-    this.createSocket(req, options, handleSocketCreation(req, true));
+    this.createSocket(req, options, handleSocketCreation(this, req, true));
   } else {
     debug('wait for socket');
     // We are over limit so we'll add it to the queue.
@@ -305,9 +306,10 @@ Agent.prototype.removeSocket = function removeSocket(s, options) {
 
   if (this.requests[name] && this.requests[name].length) {
     debug('removeSocket, have a request, make a socket');
-    var req = this.requests[name][0];
+    const req = this.requests[name][0];
     // If we have pending requests and a socket gets closed make a new one
-    this.createSocket(req, options, handleSocketCreation(req, false));
+    const socketCreationHandler = handleSocketCreation(this, req, false);
+    this.createSocket(req, options, socketCreationHandler);
   }
 };
 
@@ -337,19 +339,36 @@ Agent.prototype.destroy = function destroy() {
   }
 };
 
-function handleSocketCreation(request, informRequest) {
+function handleSocketCreation(agent, request, informRequest) {
   return function handleSocketCreation_Inner(err, socket) {
     if (err) {
       process.nextTick(emitErrorNT, request, err);
       return;
     }
     if (informRequest)
-      request.onSocket(socket);
+      setRequestSocket(agent, request, socket);
     else
       socket.emit('free');
   };
 }
 
+function setRequestSocket(agent, req, socket) {
+  req.onSocket(socket);
+  const agentTimeout = agent.options.timeout || 0;
+  if (req.timeout === undefined || req.timeout === agentTimeout) {
+    return;
+  }
+  socket.setTimeout(req.timeout);
+  // reset timeout after response end
+  req.once('response', (res) => {
+    res.once('end', () => {
+      if (socket.timeout !== agentTimeout) {
+        socket.setTimeout(agentTimeout);
+      }
+    });
+  });
+}
+
 function emitErrorNT(emitter, err) {
   emitter.emit('error', err);
 }
diff --git a/lib/_http_client.js b/lib/_http_client.js
index c4f753412c..7d28cda681 100644
--- a/lib/_http_client.js
+++ b/lib/_http_client.js
@@ -656,18 +656,35 @@ function tickOnSocket(req, socket) {
   socket.on('end', socketOnEnd);
   socket.on('close', socketCloseListener);
 
-  if (req.timeout) {
-    const emitRequestTimeout = () => req.emit('timeout');
-    socket.once('timeout', emitRequestTimeout);
-    req.once('response', (res) => {
-      res.once('end', () => {
-        socket.removeListener('timeout', emitRequestTimeout);
-      });
-    });
+  if (req.timeout !== undefined) {
+    listenSocketTimeout(req);
   }
   req.emit('socket', socket);
 }
 
+function listenSocketTimeout(req) {
+  if (req.timeoutCb) {
+    return;
+  }
+  const emitRequestTimeout = () => req.emit('timeout');
+  // Set timeoutCb so it will get cleaned up on request end.
+  req.timeoutCb = emitRequestTimeout;
+  // Delegate socket timeout event.
+  if (req.socket) {
+    req.socket.once('timeout', emitRequestTimeout);
+  } else {
+    req.on('socket', (socket) => {
+      socket.once('timeout', emitRequestTimeout);
+    });
+  }
+  // Remove socket timeout listener after response end.
+  req.once('response', (res) => {
+    res.once('end', () => {
+      req.socket.removeListener('timeout', emitRequestTimeout);
+    });
+  });
+}
+
 ClientRequest.prototype.onSocket = function onSocket(socket) {
   process.nextTick(onSocketNT, this, socket);
 };
@@ -717,42 +734,29 @@ function _deferToConnect(method, arguments_, cb) {
 }
 
 ClientRequest.prototype.setTimeout = function setTimeout(msecs, callback) {
+  listenSocketTimeout(this);
   msecs = validateTimerDuration(msecs);
   if (callback) this.once('timeout', callback);
 
-  const emitTimeout = () => this.emit('timeout');
-
-  if (this.socket && this.socket.writable) {
-    if (this.timeoutCb)
-      this.socket.setTimeout(0, this.timeoutCb);
-    this.timeoutCb = emitTimeout;
-    this.socket.setTimeout(msecs, emitTimeout);
-    return this;
-  }
-
-  // Set timeoutCb so that it'll get cleaned up on request end
-  this.timeoutCb = emitTimeout;
   if (this.socket) {
-    var sock = this.socket;
-    this.socket.once('connect', function() {
-      sock.setTimeout(msecs, emitTimeout);
-    });
-    return this;
+    setSocketTimeout(this.socket, msecs);
+  } else {
+    this.once('socket', (sock) => setSocketTimeout(sock, msecs));
   }
 
-  this.once('socket', function(sock) {
-    if (sock.connecting) {
-      sock.once('connect', function() {
-        sock.setTimeout(msecs, emitTimeout);
-      });
-    } else {
-      sock.setTimeout(msecs, emitTimeout);
-    }
-  });
-
   return this;
 };
 
+function setSocketTimeout(sock, msecs) {
+  if (sock.connecting) {
+    sock.once('connect', function() {
+      sock.setTimeout(msecs);
+    });
+  } else {
+    sock.setTimeout(msecs);
+  }
+}
+
 ClientRequest.prototype.setNoDelay = function setNoDelay(noDelay) {
   this._deferToConnect('setNoDelay', [noDelay]);
 };
diff --git a/lib/net.js b/lib/net.js
index 2393539737..889f28b0aa 100644
--- a/lib/net.js
+++ b/lib/net.js
@@ -408,6 +408,7 @@ function writeAfterFIN(chunk, encoding, cb) {
 }
 
 Socket.prototype.setTimeout = function(msecs, callback) {
+  this.timeout = msecs;
   // Type checking identical to timers.enroll()
   msecs = validateTimerDuration(msecs);