http: make OutgoingMessage._flush inline-able

lib/_http_outgoing.js

@@ -525,46 +525,41 @@ OutgoingMessage.prototype._finish = function() {
 };
 
 
+// This logic is probably a bit confusing. Let me explain a bit:
+//
+// In both HTTP servers and clients it is possible to queue up several
+// outgoing messages. This is easiest to imagine in the case of a client.
+// Take the following situation:
+//
+//    req1 = client.request('GET', '/');
+//    req2 = client.request('POST', '/');
+//
+// When the user does
+//
+//   req2.write('hello world\n');
+//
+// it's possible that the first request has not been completely flushed to
+// the socket yet. Thus the outgoing messages need to be prepared to queue
+// up data internally before sending it on further to the socket's queue.
+//
+// This function, outgoingFlush(), is called by both the Server and Client
+// to attempt to flush any pending messages out to the socket.
 OutgoingMessage.prototype._flush = function() {
-  // This logic is probably a bit confusing. Let me explain a bit:
-  //
-  // In both HTTP servers and clients it is possible to queue up several
-  // outgoing messages. This is easiest to imagine in the case of a client.
-  // Take the following situation:
-  //
-  //    req1 = client.request('GET', '/');
-  //    req2 = client.request('POST', '/');
-  //
-  // When the user does
-  //
-  //   req2.write('hello world\n');
-  //
-  // it's possible that the first request has not been completely flushed to
-  // the socket yet. Thus the outgoing messages need to be prepared to queue
-  // up data internally before sending it on further to the socket's queue.
-  //
-  // This function, outgoingFlush(), is called by both the Server and Client
-  // to attempt to flush any pending messages out to the socket.
-
-  if (!this.socket) return;
-
-  var ret;
-  while (this.output.length) {
-
-    if (!this.socket.writable) return; // XXX Necessary?
-
-    var data = this.output.shift();
-    var encoding = this.outputEncodings.shift();
-    var cb = this.outputCallbacks.shift();
-
-    ret = this.socket.write(data, encoding, cb);
-  }
+  if (this.socket && this.socket.writable) {
+    var ret;
+    while (this.output.length) {
+      var data = this.output.shift();
+      var encoding = this.outputEncodings.shift();
+      var cb = this.outputCallbacks.shift();
+      ret = this.socket.write(data, encoding, cb);
+    }
 
-  if (this.finished) {
-    // This is a queue to the server or client to bring in the next this.
-    this._finish();
-  } else if (ret) {
-    // This is necessary to prevent https from breaking
-    this.emit('drain');
+    if (this.finished) {
+      // This is a queue to the server or client to bring in the next this.
+      this._finish();
+    } else if (ret) {
+      // This is necessary to prevent https from breaking
+      this.emit('drain');
+    }
   }
 };