net,http2: merge after-write code

lib/internal/http2/core.js

@@ -108,6 +108,7 @@ const {
   writeGeneric,
   writevGeneric,
   onStreamRead,
+  kAfterAsyncWrite,
   kMaybeDestroy,
   kUpdateTimer
 } = require('internal/stream_base_commons');
@@ -1515,21 +1516,6 @@ function trackWriteState(stream, bytes) {
   session[kHandle].chunksSentSinceLastWrite = 0;
 }
 
-function afterDoStreamWrite(status, handle) {
-  const stream = handle[kOwner];
-  const session = stream[kSession];
-
-  stream[kUpdateTimer]();
-
-  const { bytes } = this;
-  stream[kState].writeQueueSize -= bytes;
-
-  if (session !== undefined)
-    session[kState].writeQueueSize -= bytes;
-  if (typeof this.callback === 'function')
-    this.callback(null);
-}
-
 function streamOnResume() {
   if (!this.destroyed)
     this[kHandle].readStart();
@@ -1782,6 +1768,13 @@ class Http2Stream extends Duplex {
                 'bug in Node.js');
   }
 
+  [kAfterAsyncWrite]({ bytes }) {
+    this[kState].writeQueueSize -= bytes;
+
+    if (this.session !== undefined)
+      this.session[kState].writeQueueSize -= bytes;
+  }
+
   [kWriteGeneric](writev, data, encoding, cb) {
     // When the Http2Stream is first created, it is corked until the
     // handle and the stream ID is assigned. However, if the user calls
@@ -1808,7 +1801,7 @@ class Http2Stream extends Duplex {
     if (!this.headersSent)
       this[kProceed]();
 
-    const req = createWriteWrap(this[kHandle], afterDoStreamWrite);
+    const req = createWriteWrap(this[kHandle]);
     req.stream = this[kID];
 
     if (writev)

lib/internal/stream_base_commons.js

@@ -16,6 +16,7 @@ const { owner_symbol } = require('internal/async_hooks').symbols;
 
 const kMaybeDestroy = Symbol('kMaybeDestroy');
 const kUpdateTimer = Symbol('kUpdateTimer');
+const kAfterAsyncWrite = Symbol('kAfterAsyncWrite');
 
 function handleWriteReq(req, data, encoding) {
   const { handle } = req;
@@ -52,11 +53,33 @@ function handleWriteReq(req, data, encoding) {
   }
 }
 
-function createWriteWrap(handle, oncomplete) {
+function onWriteComplete(status) {
+  const stream = this.handle[owner_symbol];
+
+  if (stream.destroyed) {
+    if (typeof this.callback === 'function')
+      this.callback(null);
+    return;
+  }
+
+  if (status < 0) {
+    const ex = errnoException(status, 'write', this.error);
+    stream.destroy(ex, this.callback);
+    return;
+  }
+
+  stream[kUpdateTimer]();
+  stream[kAfterAsyncWrite](this);
+
+  if (typeof this.callback === 'function')
+    this.callback(null);
+}
+
+function createWriteWrap(handle) {
   var req = new WriteWrap();
 
   req.handle = handle;
-  req.oncomplete = oncomplete;
+  req.oncomplete = onWriteComplete;
   req.async = false;
   req.bytes = 0;
   req.buffer = null;
@@ -160,6 +183,7 @@ module.exports = {
   writevGeneric,
   writeGeneric,
   onStreamRead,
+  kAfterAsyncWrite,
   kMaybeDestroy,
   kUpdateTimer,
 };

lib/net.js

@@ -62,6 +62,7 @@ const {
   writevGeneric,
   writeGeneric,
   onStreamRead,
+  kAfterAsyncWrite,
   kUpdateTimer
 } = require('internal/stream_base_commons');
 const errors = require('internal/errors');
@@ -693,6 +694,10 @@ protoGetter('localPort', function localPort() {
 });
 
 
+Socket.prototype[kAfterAsyncWrite] = function() {
+  this[kLastWriteQueueSize] = 0;
+};
+
 Socket.prototype._writeGeneric = function(writev, data, encoding, cb) {
   // If we are still connecting, then buffer this for later.
   // The Writable logic will buffer up any more writes while
@@ -715,7 +720,7 @@ Socket.prototype._writeGeneric = function(writev, data, encoding, cb) {
 
   this._unrefTimer();
 
-  var req = createWriteWrap(this._handle, afterWrite);
+  var req = createWriteWrap(this._handle);
   if (writev)
     writevGeneric(this, req, data, cb);
   else
@@ -779,39 +784,6 @@ protoGetter('bytesWritten', function bytesWritten() {
 });
 
 
-function afterWrite(status, handle, err) {
-  var self = handle[owner_symbol];
-  if (self !== process.stderr && self !== process.stdout)
-    debug('afterWrite', status);
-
-  if (this.async)
-    self[kLastWriteQueueSize] = 0;
-
-  // callback may come after call to destroy.
-  if (self.destroyed) {
-    debug('afterWrite destroyed');
-    if (this.callback)
-      this.callback(null);
-    return;
-  }
-
-  if (status < 0) {
-    var ex = errnoException(status, 'write', this.error);
-    debug('write failure', ex);
-    self.destroy(ex, this.callback);
-    return;
-  }
-
-  self._unrefTimer();
-
-  if (self !== process.stderr && self !== process.stdout)
-    debug('afterWrite call cb');
-
-  if (this.callback)
-    this.callback.call(undefined);
-}
-
-
 function checkBindError(err, port, handle) {
   // EADDRINUSE may not be reported until we call listen() or connect().
   // To complicate matters, a failed bind() followed by listen() or connect()

src/node_http2.cc

@@ -1570,8 +1570,12 @@ void Http2Session::ClearOutgoing(int status) {
     current_outgoing_buffers_.swap(outgoing_buffers_);
     for (const nghttp2_stream_write& wr : current_outgoing_buffers_) {
       WriteWrap* wrap = wr.req_wrap;
-      if (wrap != nullptr)
-        wrap->Done(status);
+      if (wrap != nullptr) {
+        // TODO(addaleax): Pass `status` instead of 0, so that we actually error
+        // out with the error from the write to the underlying protocol,
+        // if one occurred.
+        wrap->Done(0);
+      }
     }
   }