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http: reduce parts in chunked response when corking
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Refs: nodejs/performance#57

PR-URL: #50167
Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
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@ronag
ronag committed Oct 15, 2023
1 parent 8609915 commit d68d0ea
Showing 1 changed file with 87 additions and 41 deletions.
128 changes: 87 additions & 41 deletions lib/_http_outgoing.js
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Original file line number Diff line number Diff line change
Expand Up @@ -82,6 +82,9 @@ let debug = require('internal/util/debuglog').debuglog('http', (fn) => {
});

const kCorked = Symbol('corked');
const kSocket = Symbol('kSocket');
const kChunkedBuffer = Symbol('kChunkedBuffer');
const kChunkedLength = Symbol('kChunkedLength');
const kUniqueHeaders = Symbol('kUniqueHeaders');
const kBytesWritten = Symbol('kBytesWritten');
const kErrored = Symbol('errored');
Expand Down Expand Up @@ -140,9 +143,11 @@ function OutgoingMessage(options) {
this.finished = false;
this._headerSent = false;
this[kCorked] = 0;
this[kChunkedBuffer] = [];
this[kChunkedLength] = 0;
this._closed = false;

this.socket = null;
this[kSocket] = null;
this._header = null;
this[kOutHeaders] = null;

Expand Down Expand Up @@ -177,7 +182,7 @@ ObjectDefineProperty(OutgoingMessage.prototype, 'writableFinished', {
return (
this.finished &&
this.outputSize === 0 &&
(!this.socket || this.socket.writableLength === 0)
(!this[kSocket] || this[kSocket].writableLength === 0)
);
},
});
Expand All @@ -192,22 +197,21 @@ ObjectDefineProperty(OutgoingMessage.prototype, 'writableObjectMode', {
ObjectDefineProperty(OutgoingMessage.prototype, 'writableLength', {
__proto__: null,
get() {
return this.outputSize + (this.socket ? this.socket.writableLength : 0);
return this.outputSize + this[kChunkedLength] + (this[kSocket] ? this[kSocket].writableLength : 0);
},
});

ObjectDefineProperty(OutgoingMessage.prototype, 'writableHighWaterMark', {
__proto__: null,
get() {
return this.socket ? this.socket.writableHighWaterMark : this[kHighWaterMark];
return this[kSocket] ? this[kSocket].writableHighWaterMark : this[kHighWaterMark];
},
});

ObjectDefineProperty(OutgoingMessage.prototype, 'writableCorked', {
__proto__: null,
get() {
const corked = this.socket ? this.socket.writableCorked : 0;
return corked + this[kCorked];
return this[kCorked];
},
});

Expand Down Expand Up @@ -235,13 +239,27 @@ ObjectDefineProperty(OutgoingMessage.prototype, '_headers', {
ObjectDefineProperty(OutgoingMessage.prototype, 'connection', {
__proto__: null,
get: function() {
return this.socket;
return this[kSocket];
},
set: function(val) {
this.socket = val;
},
});

ObjectDefineProperty(OutgoingMessage.prototype, 'socket', {
__proto__: null,
get: function() {
return this[kSocket];
},
set: function(val) {
for (let n = 0; n < this[kCorked]; n++) {
val?.cork();
this[kSocket]?.uncork();
}
this[kSocket] = val;
},
});

ObjectDefineProperty(OutgoingMessage.prototype, '_headerNames', {
__proto__: null,
get: internalUtil.deprecate(function() {
Expand Down Expand Up @@ -299,19 +317,45 @@ OutgoingMessage.prototype._renderHeaders = function _renderHeaders() {
};

OutgoingMessage.prototype.cork = function() {
if (this.socket) {
this.socket.cork();
} else {
this[kCorked]++;
this[kCorked]++;
if (this[kSocket]) {
this[kSocket].cork();
}
};

OutgoingMessage.prototype.uncork = function() {
if (this.socket) {
this.socket.uncork();
} else if (this[kCorked]) {
this[kCorked]--;
this[kCorked]--;
if (this[kSocket]) {
this[kSocket].uncork();
}

if (this[kCorked] || this[kChunkedBuffer].length === 0) {
return;
}

const len = this[kChunkedLength];
const buf = this[kChunkedBuffer];

assert(this.chunkedEncoding);

let callbacks;
this._send(NumberPrototypeToString(len, 16), 'latin1', null);
this._send(crlf_buf, null, null);
for (let n = 0; n < buf.length; n += 3) {
this._send(buf[n + 0], buf[n + 1], null);
if (buf[n + 2]) {
callbacks ??= [];
callbacks.push(buf[n + 2]);
}
}
this._send(crlf_buf, null, callbacks.length ? (err) => {
for (const callback of callbacks) {
callback(err);
}
} : null);

this[kChunkedBuffer].length = 0;
this[kChunkedLength] = 0;
};

OutgoingMessage.prototype.setTimeout = function setTimeout(msecs, callback) {
Expand All @@ -320,12 +364,12 @@ OutgoingMessage.prototype.setTimeout = function setTimeout(msecs, callback) {
this.on('timeout', callback);
}

if (!this.socket) {
if (!this[kSocket]) {
this.once('socket', function socketSetTimeoutOnConnect(socket) {
socket.setTimeout(msecs);
});
} else {
this.socket.setTimeout(msecs);
this[kSocket].setTimeout(msecs);
}
return this;
};
Expand All @@ -342,8 +386,8 @@ OutgoingMessage.prototype.destroy = function destroy(error) {

this[kErrored] = error;

if (this.socket) {
this.socket.destroy(error);
if (this[kSocket]) {
this[kSocket].destroy(error);
} else {
this.once('socket', function socketDestroyOnConnect(socket) {
socket.destroy(error);
Expand Down Expand Up @@ -382,7 +426,7 @@ OutgoingMessage.prototype._send = function _send(data, encoding, callback, byteL

OutgoingMessage.prototype._writeRaw = _writeRaw;
function _writeRaw(data, encoding, callback, size) {
const conn = this.socket;
const conn = this[kSocket];
if (conn && conn.destroyed) {
// The socket was destroyed. If we're still trying to write to it,
// then we haven't gotten the 'close' event yet.
Expand Down Expand Up @@ -938,10 +982,16 @@ function write_(msg, chunk, encoding, callback, fromEnd) {
let ret;
if (msg.chunkedEncoding && chunk.length !== 0) {
len ??= typeof chunk === 'string' ? Buffer.byteLength(chunk, encoding) : chunk.byteLength;
msg._send(NumberPrototypeToString(len, 16), 'latin1', null);
msg._send(crlf_buf, null, null);
msg._send(chunk, encoding, null, len);
ret = msg._send(crlf_buf, null, callback);
if (msg[kCorked] && msg._headerSent) {
msg[kChunkedBuffer].push(chunk, encoding, callback);
msg[kChunkedLength] += len;
ret = msg[kChunkedLength] < msg[kHighWaterMark];
} else {
msg._send(NumberPrototypeToString(len, 16), 'latin1', null);
msg._send(crlf_buf, null, null);
msg._send(chunk, encoding, null, len);
ret = msg._send(crlf_buf, null, callback);
}
} else {
ret = msg._send(chunk, encoding, callback, len);
}
Expand Down Expand Up @@ -1023,8 +1073,8 @@ OutgoingMessage.prototype.end = function end(chunk, encoding, callback) {
return this;
}

if (this.socket) {
this.socket.cork();
if (this[kSocket]) {
this[kSocket].cork();
}

write_(this, chunk, encoding, null, true);
Expand All @@ -1038,8 +1088,8 @@ OutgoingMessage.prototype.end = function end(chunk, encoding, callback) {
}
return this;
} else if (!this._header) {
if (this.socket) {
this.socket.cork();
if (this[kSocket]) {
this[kSocket].cork();
}

this._contentLength = 0;
Expand All @@ -1063,21 +1113,22 @@ OutgoingMessage.prototype.end = function end(chunk, encoding, callback) {
process.nextTick(finish);
}

if (this.socket) {
if (this[kSocket]) {
// Fully uncork connection on end().
this.socket._writableState.corked = 1;
this.socket.uncork();
this[kSocket]._writableState.corked = 1;
this[kSocket].uncork();
}
this[kCorked] = 0;
this[kCorked] = 1;
this.uncork();

this.finished = true;

// There is the first message on the outgoing queue, and we've sent
// everything to the socket.
debug('outgoing message end.');
if (this.outputData.length === 0 &&
this.socket &&
this.socket._httpMessage === this) {
this[kSocket] &&
this[kSocket]._httpMessage === this) {
this._finish();
}

Expand All @@ -1088,7 +1139,7 @@ OutgoingMessage.prototype.end = function end(chunk, encoding, callback) {
// This function is called once all user data are flushed to the socket.
// Note that it has a chance that the socket is not drained.
OutgoingMessage.prototype._finish = function _finish() {
assert(this.socket);
assert(this[kSocket]);
this.emit('prefinish');
};

Expand All @@ -1113,7 +1164,7 @@ OutgoingMessage.prototype._finish = function _finish() {
// This function, _flush(), is called by both the Server and Client
// to attempt to flush any pending messages out to the socket.
OutgoingMessage.prototype._flush = function _flush() {
const socket = this.socket;
const socket = this[kSocket];

if (socket && socket.writable) {
// There might be remaining data in this.output; write it out
Expand All @@ -1130,11 +1181,6 @@ OutgoingMessage.prototype._flush = function _flush() {
};

OutgoingMessage.prototype._flushOutput = function _flushOutput(socket) {
while (this[kCorked]) {
this[kCorked]--;
socket.cork();
}

const outputLength = this.outputData.length;
if (outputLength <= 0)
return undefined;
Expand Down

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