From 16e0c239bba5ee8426cbb22d7363fc74f2243f0b Mon Sep 17 00:00:00 2001
From: Matteo Collina <hello@matteocollina.com>
Date: Mon, 5 Dec 2016 17:48:42 +0100
Subject: [PATCH] Removed most closures.

---
 lib/internal/http2.js | 104 ++++++++++++++++++++----------------------
 1 file changed, 49 insertions(+), 55 deletions(-)

diff --git a/lib/internal/http2.js b/lib/internal/http2.js
index 4dcb360e88..fe11d96a42 100644
--- a/lib/internal/http2.js
+++ b/lib/internal/http2.js
@@ -312,9 +312,7 @@ class Http2Stream extends Duplex {
     if (this._handle) {
       this._handle.setLocalWindowSize(size);
     } else {
-      this.once('handle', () => {
-        this._handle.setLocalWindowSize(size);
-      });
+      this.once('handle', this.setLocalWindowSize.bind(this, size));
     }
   }
 
@@ -322,9 +320,7 @@ class Http2Stream extends Duplex {
     if (this._handle) {
       this._handle.changeStreamPriority(parentId, priority, exclusive);
     } else {
-      this.once('handle', () => {
-        this._handle.changeStreamPriority(parentId, priority, exclusive);
-      });
+      this.once('handle', this.changeStreamPriority.bind(this, parentId, priority, exclusive));
     }
   }
 
@@ -332,9 +328,7 @@ class Http2Stream extends Duplex {
     if (this._handle) {
       this._handle.respond();
     } else {
-      this.once('handle', () => {
-        this._handle.respond();
-      });
+      this.once('handle', onHandleRespond);
     }
   }
 
@@ -342,9 +336,7 @@ class Http2Stream extends Duplex {
     if (this._handle) {
       this._handle.resume();
     } else {
-      this.once('handle', () => {
-        this._handle.resume();
-      });
+      this.once('handle', onHandleResume);
     }
   }
 
@@ -352,9 +344,7 @@ class Http2Stream extends Duplex {
     if (this._handle) {
       this._handle.sendContinue();
     } else {
-      this.once('handle', () => {
-        this._handle.sendContinue();
-      });
+      this.once('handle', this.sendContinue.bind(this));
     }
   }
 
@@ -362,9 +352,7 @@ class Http2Stream extends Duplex {
     if (this._handle) {
       this._handle.sendPriority(parentId, priority, exclusive);
     } else {
-      this.once('handle', () => {
-        this._handle.sendPriority(parentId, priority, exclusive);
-      });
+      this.once('handle', this.sendPriority.bind(this, parentId, priority, exclusive));
     }
   }
 
@@ -372,9 +360,7 @@ class Http2Stream extends Duplex {
     if (this._handle) {
       this._handle.sendRstStream(code);
     } else {
-      this.once('handle', () => {
-        this._handle.sendRstStream(code);
-      });
+      this.once('handle', this.sendRstStream.bind(this, code));
     }
   }
 
@@ -382,9 +368,7 @@ class Http2Stream extends Duplex {
     if (this._handle) {
       return this._handle.sendPushPromise(mapToHeaders(headers));
     } else {
-      this.once('handle', () => {
-        this._handle.sendPushPromise(mapToHeaders(headers));
-      });
+      this.once('handle', this.sendPushPromise.bind(this, headers));
     }
   }
 
@@ -392,9 +376,7 @@ class Http2Stream extends Duplex {
     if (this._handle) {
       this._handle.addHeader(name, value, noindex);
     } else {
-      this.once('handle', () => {
-        this._handle.addHeader(name, value, noindex);
-      });
+      this.once('handle', this.addHeader.bind(this, name, value, noindex));
     }
   }
 
@@ -402,9 +384,7 @@ class Http2Stream extends Duplex {
     if (this._handle) {
       this._handle.addTrailer(name, value, noindex);
     } else {
-      this.once('handle', () => {
-        this._handle.addTrailer(name, value, noindex);
-      });
+      this.once('handle', this.addTrailer.bind(this, name, value, noindex));
     }
   }
 
@@ -464,9 +444,7 @@ class Http2Stream extends Duplex {
     if (this._handle) {
       this._handle.finishedWriting();
     } else {
-      this.on('handle', () => {
-        this._handle.finishedWriting();
-      });
+      this.on('handle', onHandleFinishedWriting);
     }
   }
 
@@ -474,19 +452,33 @@ class Http2Stream extends Duplex {
     if (this._handle) {
       this._handle.readStart();
     } else {
-      this.once('handle', () => {
-        this._handle.readStart();
-      });
+      this.once('handle', onHandleReadStart);
     }
   }
 }
 
+function onHandleReadStart() {
+  this._handle.readStart();
+}
+
+function onHandleFinishedWriting() {
+  this._handle.finishedWriting();
+}
+
 function onHandleWrite(data, encoding, cb) {
   return function onWriteFinished() {
     this._write(data, encoding, cb);
   };
 }
 
+function onHandleRespond() {
+  this._handle.respond();
+}
+
+function onHandleResume() {
+  this._handle.resume();
+}
+
 class Http2Session extends EventEmitter {
   constructor(type, options, socket) {
     super();
@@ -495,6 +487,7 @@ class Http2Session extends EventEmitter {
     this[kHandle] = sessions.alloc();
     this[kHandle][kOwner] = this;
     this[kHandle].reinitialize(type, options, socket._handle._externalStream);
+    this[kSocket] = socket;
   }
 
   reset() {
@@ -1103,28 +1096,29 @@ function sessionOnStreamClose(stream, code) {
   response[kStream] = undefined;
   stream[kRequest] = undefined;
   stream[kResponse] = undefined;
-  setImmediate(() => maybeDestroyStream(stream));
+  setImmediate(maybeDestroyStream, stream);
 }
 
-function sessionOnError(server, socket) {
-  function fn(error) {
-    if (server.listenerCount('sessionError') > 0) {
-      server.emit('sessionError', error);
-      return;
-    }
-    socket.destroy(error);
+function sessionOnError() {
+  const session = this;
+  const server = session[kServer];
+  const socket = session[kSocket];
+
+  if (server.listenerCount('sessionError') > 0) {
+    server.emit('sessionError', error);
+    return;
   }
-  return fn;
+  socket.destroy(error);
 }
 
-function socketOnTimeout(server, session) {
-  function fn() {
-    if (!server.emit('timeout', this)) {
-      // Session timed out, attempt a graceful exit
-      session.gracefulTerminate(() => this.destroy());
-    }
+function socketOnTimeout() {
+  const socket = this;
+  const server = socket[kServer];
+
+  if (!server.emit('timeout', this)) {
+    // Session timed out, attempt a graceful exit
+    session.gracefulTerminate(this.destroy.bind(this));
   }
-  return fn;
 }
 
 function socketOnceError(error) {
@@ -1248,7 +1242,7 @@ function connectionListener(socket) {
   session[kServer] = this;
   socket[kServer] = this;
 
-  session.on('error', sessionOnError(this, socket));
+  session.on('error', sessionOnError);
 
   // Disable TLS Negotiation on this socket. The HTTP/2 allows renegotiation to
   // happen up until the initial HTTP/2 session bootstrap. After that, it is
@@ -1259,7 +1253,7 @@ function connectionListener(socket) {
   // Set up the timeout listener
   if (this.timeout)
     socket.setTimeout(this.timeout);
-  socket.on('timeout', socketOnTimeout(this, session));
+  socket.on('timeout', socketOnTimeout);
 
   // Destroy the session if the socket is destroyed
   const destroySocket = socket.destroy;
@@ -1442,7 +1436,7 @@ function clientSessionOnStreamClose(stream, code) {
   response[kStream] = undefined;
   stream[kRequest] = undefined;
   stream[kResponse] = undefined;
-  setImmediate(() => maybeDestroyStream(stream));
+  setImmediate(maybeDestroyStream, stream);
 }
 
 function initializeClientOptions(options) {