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net.js
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2501 lines (2099 loc) · 68.1 KB
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// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
'use strict';
const {
ArrayIsArray,
ArrayPrototypeIncludes,
ArrayPrototypeIndexOf,
ArrayPrototypePush,
Boolean,
FunctionPrototypeBind,
FunctionPrototypeCall,
MathMax,
Number,
NumberIsNaN,
NumberParseInt,
ObjectDefineProperty,
ObjectSetPrototypeOf,
Symbol,
SymbolAsyncDispose,
SymbolDispose,
} = primordials;
const EventEmitter = require('events');
const { addAbortListener } = require('internal/events/abort_listener');
const stream = require('stream');
let debug = require('internal/util/debuglog').debuglog('net', (fn) => {
debug = fn;
});
const {
kReinitializeHandle,
isIP,
isIPv4,
isIPv6,
normalizedArgsSymbol,
makeSyncWrite,
} = require('internal/net');
const assert = require('internal/assert');
const {
UV_EADDRINUSE,
UV_EINVAL,
UV_ENOTCONN,
UV_ECANCELED,
UV_ETIMEDOUT,
} = internalBinding('uv');
const { convertIpv6StringToBuffer } = internalBinding('cares_wrap');
const { Buffer } = require('buffer');
const { ShutdownWrap } = internalBinding('stream_wrap');
const {
TCP,
TCPConnectWrap,
constants: TCPConstants,
} = internalBinding('tcp_wrap');
const {
Pipe,
PipeConnectWrap,
constants: PipeConstants,
} = internalBinding('pipe_wrap');
const {
newAsyncId,
defaultTriggerAsyncIdScope,
symbols: { async_id_symbol, owner_symbol },
} = require('internal/async_hooks');
const {
writevGeneric,
writeGeneric,
onStreamRead,
kAfterAsyncWrite,
kHandle,
kUpdateTimer,
setStreamTimeout,
kBuffer,
kBufferCb,
kBufferGen,
} = require('internal/stream_base_commons');
const {
ErrnoException,
ExceptionWithHostPort,
NodeAggregateError,
UVExceptionWithHostPort,
codes: {
ERR_INVALID_ADDRESS_FAMILY,
ERR_INVALID_ARG_TYPE,
ERR_INVALID_ARG_VALUE,
ERR_INVALID_FD_TYPE,
ERR_INVALID_HANDLE_TYPE,
ERR_INVALID_IP_ADDRESS,
ERR_IP_BLOCKED,
ERR_MISSING_ARGS,
ERR_SERVER_ALREADY_LISTEN,
ERR_SERVER_NOT_RUNNING,
ERR_SOCKET_CLOSED,
ERR_SOCKET_CLOSED_BEFORE_CONNECTION,
ERR_SOCKET_CONNECTION_TIMEOUT,
},
genericNodeError,
} = require('internal/errors');
const { isUint8Array } = require('internal/util/types');
const { queueMicrotask } = require('internal/process/task_queues');
const {
guessHandleType,
isWindows,
kEmptyObject,
promisify,
} = require('internal/util');
const {
validateAbortSignal,
validateBoolean,
validateFunction,
validateInt32,
validateNumber,
validatePort,
validateString,
} = require('internal/validators');
const kLastWriteQueueSize = Symbol('lastWriteQueueSize');
const { getOptionValue } = require('internal/options');
// Lazy loaded to improve startup performance.
let cluster;
let dns;
let BlockList;
let SocketAddress;
let autoSelectFamilyDefault = getOptionValue('--network-family-autoselection');
let autoSelectFamilyAttemptTimeoutDefault = getOptionValue('--network-family-autoselection-attempt-timeout');
const { clearTimeout, setTimeout } = require('timers');
const { kTimeout } = require('internal/timers');
const DEFAULT_IPV4_ADDR = '0.0.0.0';
const DEFAULT_IPV6_ADDR = '::';
const noop = () => {};
const kPerfHooksNetConnectContext = Symbol('kPerfHooksNetConnectContext');
const dc = require('diagnostics_channel');
const netClientSocketChannel = dc.channel('net.client.socket');
const netServerSocketChannel = dc.channel('net.server.socket');
const netServerListen = dc.tracingChannel('net.server.listen');
const {
hasObserver,
startPerf,
stopPerf,
} = require('internal/perf/observe');
const { getDefaultHighWaterMark } = require('internal/streams/state');
function getFlags(options) {
let flags = 0;
if (options.ipv6Only === true) {
flags |= TCPConstants.UV_TCP_IPV6ONLY;
}
if (options.reusePort === true) {
flags |= TCPConstants.UV_TCP_REUSEPORT;
}
return flags;
}
function createHandle(fd, is_server) {
validateInt32(fd, 'fd', 0);
const type = guessHandleType(fd);
if (type === 'PIPE') {
return new Pipe(
is_server ? PipeConstants.SERVER : PipeConstants.SOCKET,
);
}
if (type === 'TCP') {
return new TCP(
is_server ? TCPConstants.SERVER : TCPConstants.SOCKET,
);
}
throw new ERR_INVALID_FD_TYPE(type);
}
function getNewAsyncId(handle) {
return (!handle || typeof handle.getAsyncId !== 'function') ?
newAsyncId() : handle.getAsyncId();
}
function isPipeName(s) {
return typeof s === 'string' && toNumber(s) === false;
}
/**
* Creates a new TCP or IPC server
* @param {{
* allowHalfOpen?: boolean;
* pauseOnConnect?: boolean;
* }} [options]
* @param {Function} [connectionListener]
* @returns {Server}
*/
function createServer(options, connectionListener) {
return new Server(options, connectionListener);
}
// Target API:
//
// let s = net.connect({port: 80, host: 'google.com'}, function() {
// ...
// });
//
// There are various forms:
//
// connect(options, [cb])
// connect(port, [host], [cb])
// connect(path, [cb]);
//
function connect(...args) {
const normalized = normalizeArgs(args);
const options = normalized[0];
debug('createConnection', normalized);
const socket = new Socket(options);
if (options.timeout) {
socket.setTimeout(options.timeout);
}
return socket.connect(normalized);
}
function getDefaultAutoSelectFamily() {
return autoSelectFamilyDefault;
}
function setDefaultAutoSelectFamily(value) {
validateBoolean(value, 'value');
autoSelectFamilyDefault = value;
}
function getDefaultAutoSelectFamilyAttemptTimeout() {
return autoSelectFamilyAttemptTimeoutDefault;
}
function setDefaultAutoSelectFamilyAttemptTimeout(value) {
validateInt32(value, 'value', 1);
if (value < 10) {
value = 10;
}
autoSelectFamilyAttemptTimeoutDefault = value;
}
// Returns an array [options, cb], where options is an object,
// cb is either a function or null.
// Used to normalize arguments of Socket.prototype.connect() and
// Server.prototype.listen(). Possible combinations of parameters:
// (options[...][, cb])
// (path[...][, cb])
// ([port][, host][...][, cb])
// For Socket.prototype.connect(), the [...] part is ignored
// For Server.prototype.listen(), the [...] part is [, backlog]
// but will not be handled here (handled in listen())
function normalizeArgs(args) {
let arr;
if (args.length === 0) {
arr = [{}, null];
arr[normalizedArgsSymbol] = true;
return arr;
}
const arg0 = args[0];
let options = {};
if (typeof arg0 === 'object' && arg0 !== null) {
// (options[...][, cb])
options = arg0;
} else if (isPipeName(arg0)) {
// (path[...][, cb])
options.path = arg0;
} else {
// ([port][, host][...][, cb])
options.port = arg0;
if (args.length > 1 && typeof args[1] === 'string') {
options.host = args[1];
}
}
const cb = args[args.length - 1];
if (typeof cb !== 'function')
arr = [options, null];
else
arr = [options, cb];
arr[normalizedArgsSymbol] = true;
return arr;
}
// Called when creating new Socket, or when re-using a closed Socket
function initSocketHandle(self) {
self._undestroy();
self._sockname = null;
// Handle creation may be deferred to bind() or connect() time.
if (self._handle) {
self._handle[owner_symbol] = self;
self._handle.onread = onStreamRead;
self[async_id_symbol] = getNewAsyncId(self._handle);
let userBuf = self[kBuffer];
if (userBuf) {
const bufGen = self[kBufferGen];
if (bufGen !== null) {
userBuf = bufGen();
if (!isUint8Array(userBuf))
return;
self[kBuffer] = userBuf;
}
self._handle.useUserBuffer(userBuf);
}
}
}
function closeSocketHandle(self, isException, isCleanupPending = false) {
if (self._handle) {
self._handle.close(() => {
debug('emit close');
self.emit('close', isException);
if (isCleanupPending) {
self._handle.onread = noop;
self._handle = null;
self._sockname = null;
}
});
}
}
const kBytesRead = Symbol('kBytesRead');
const kBytesWritten = Symbol('kBytesWritten');
const kSetNoDelay = Symbol('kSetNoDelay');
const kSetKeepAlive = Symbol('kSetKeepAlive');
const kSetKeepAliveInitialDelay = Symbol('kSetKeepAliveInitialDelay');
function Socket(options) {
if (!(this instanceof Socket)) return new Socket(options);
if (options?.objectMode) {
throw new ERR_INVALID_ARG_VALUE(
'options.objectMode',
options.objectMode,
'is not supported',
);
} else if (options?.readableObjectMode || options?.writableObjectMode) {
throw new ERR_INVALID_ARG_VALUE(
`options.${
options.readableObjectMode ? 'readableObjectMode' : 'writableObjectMode'
}`,
options.readableObjectMode || options.writableObjectMode,
'is not supported',
);
}
if (options?.keepAliveInitialDelay !== undefined) {
validateNumber(
options?.keepAliveInitialDelay, 'options.keepAliveInitialDelay',
);
if (options.keepAliveInitialDelay < 0) {
options.keepAliveInitialDelay = 0;
}
}
this.connecting = false;
// Problem with this is that users can supply their own handle, that may not
// have _handle.getAsyncId(). In this case an[async_id_symbol] should
// probably be supplied by async_hooks.
this[async_id_symbol] = -1;
this._hadError = false;
this[kHandle] = null;
this._parent = null;
this._host = null;
this[kLastWriteQueueSize] = 0;
this[kTimeout] = null;
this[kBuffer] = null;
this[kBufferCb] = null;
this[kBufferGen] = null;
this._closeAfterHandlingError = false;
if (typeof options === 'number')
options = { fd: options }; // Legacy interface.
else
options = { ...options };
// Default to *not* allowing half open sockets.
options.allowHalfOpen = Boolean(options.allowHalfOpen);
// For backwards compat do not emit close on destroy.
options.emitClose = false;
options.autoDestroy = true;
// Handle strings directly.
options.decodeStrings = false;
stream.Duplex.call(this, options);
if (options.handle) {
this._handle = options.handle; // private
this[async_id_symbol] = getNewAsyncId(this._handle);
} else if (options.fd !== undefined) {
const { fd } = options;
let err;
// createHandle will throw ERR_INVALID_FD_TYPE if `fd` is not
// a valid `PIPE` or `TCP` descriptor
this._handle = createHandle(fd, false);
err = this._handle.open(fd);
// While difficult to fabricate, in some architectures
// `open` may return an error code for valid file descriptors
// which cannot be opened. This is difficult to test as most
// un-openable fds will throw on `createHandle`
if (err)
throw new ErrnoException(err, 'open');
this[async_id_symbol] = this._handle.getAsyncId();
if ((fd === 1 || fd === 2) &&
(this._handle instanceof Pipe) && isWindows) {
// Make stdout and stderr blocking on Windows
err = this._handle.setBlocking(true);
if (err)
throw new ErrnoException(err, 'setBlocking');
this._writev = null;
this._write = makeSyncWrite(fd);
// makeSyncWrite adjusts this value like the original handle would, so
// we need to let it do that by turning it into a writable, own
// property.
ObjectDefineProperty(this._handle, 'bytesWritten', {
__proto__: null,
value: 0, writable: true,
});
}
}
const onread = options.onread;
if (onread !== null && typeof onread === 'object' &&
(isUint8Array(onread.buffer) || typeof onread.buffer === 'function') &&
typeof onread.callback === 'function') {
if (typeof onread.buffer === 'function') {
this[kBuffer] = true;
this[kBufferGen] = onread.buffer;
} else {
this[kBuffer] = onread.buffer;
}
this[kBufferCb] = onread.callback;
}
this[kSetNoDelay] = Boolean(options.noDelay);
this[kSetKeepAlive] = Boolean(options.keepAlive);
this[kSetKeepAliveInitialDelay] = ~~(options.keepAliveInitialDelay / 1000);
// Shut down the socket when we're finished with it.
this.on('end', onReadableStreamEnd);
initSocketHandle(this);
this._pendingData = null;
this._pendingEncoding = '';
// If we have a handle, then start the flow of data into the
// buffer. if not, then this will happen when we connect
if (this._handle && options.readable !== false) {
if (options.pauseOnCreate) {
// Stop the handle from reading and pause the stream
this._handle.reading = false;
this._handle.readStop();
this.readableFlowing = false;
} else if (!options.manualStart) {
this.read(0);
}
}
if (options.signal) {
addClientAbortSignalOption(this, options);
}
// Reserve properties
this.server = null;
this._server = null;
// Used after `.destroy()`
this[kBytesRead] = 0;
this[kBytesWritten] = 0;
if (options.blockList) {
if (!module.exports.BlockList.isBlockList(options.blockList)) {
throw new ERR_INVALID_ARG_TYPE('options.blockList', 'net.BlockList', options.blockList);
}
this.blockList = options.blockList;
}
}
ObjectSetPrototypeOf(Socket.prototype, stream.Duplex.prototype);
ObjectSetPrototypeOf(Socket, stream.Duplex);
// Refresh existing timeouts.
Socket.prototype._unrefTimer = function _unrefTimer() {
for (let s = this; s !== null; s = s._parent) {
if (s[kTimeout])
s[kTimeout].refresh();
}
};
// The user has called .end(), and all the bytes have been
// sent out to the other side.
Socket.prototype._final = function(cb) {
// If still connecting - defer handling `_final` until 'connect' will happen
if (this.connecting) {
debug('_final: not yet connected');
return this.once('connect', () => this._final(cb));
}
if (!this._handle)
return cb();
debug('_final: not ended, call shutdown()');
const req = new ShutdownWrap();
req.oncomplete = afterShutdown;
req.handle = this._handle;
req.callback = cb;
const err = this._handle.shutdown(req);
if (err === 1 || err === UV_ENOTCONN) // synchronous finish
return cb();
else if (err !== 0)
return cb(new ErrnoException(err, 'shutdown'));
};
function afterShutdown() {
const self = this.handle[owner_symbol];
debug('afterShutdown destroyed=%j', self.destroyed);
this.callback();
}
// Provide a better error message when we call end() as a result
// of the other side sending a FIN. The standard 'write after end'
// is overly vague, and makes it seem like the user's code is to blame.
function writeAfterFIN(chunk, encoding, cb) {
if (!this.writableEnded) {
return stream.Duplex.prototype.write.call(this, chunk, encoding, cb);
}
if (typeof encoding === 'function') {
cb = encoding;
encoding = null;
}
const er = genericNodeError(
'This socket has been ended by the other party',
{ code: 'EPIPE' },
);
if (typeof cb === 'function') {
defaultTriggerAsyncIdScope(this[async_id_symbol], process.nextTick, cb, er);
}
this.destroy(er);
return false;
}
Socket.prototype.setTimeout = setStreamTimeout;
Socket.prototype._onTimeout = function() {
const handle = this._handle;
const lastWriteQueueSize = this[kLastWriteQueueSize];
if (lastWriteQueueSize > 0 && handle) {
// `lastWriteQueueSize !== writeQueueSize` means there is
// an active write in progress, so we suppress the timeout.
const { writeQueueSize } = handle;
if (lastWriteQueueSize !== writeQueueSize) {
this[kLastWriteQueueSize] = writeQueueSize;
this._unrefTimer();
return;
}
}
debug('_onTimeout');
this.emit('timeout');
};
Socket.prototype.setNoDelay = function(enable) {
// Backwards compatibility: assume true when `enable` is omitted
enable = Boolean(enable === undefined ? true : enable);
if (!this._handle) {
this[kSetNoDelay] = enable;
return this;
}
if (this._handle.setNoDelay && enable !== this[kSetNoDelay]) {
this[kSetNoDelay] = enable;
this._handle.setNoDelay(enable);
}
return this;
};
Socket.prototype.setKeepAlive = function(enable, initialDelayMsecs) {
enable = Boolean(enable);
const initialDelay = ~~(initialDelayMsecs / 1000);
if (!this._handle) {
this[kSetKeepAlive] = enable;
this[kSetKeepAliveInitialDelay] = initialDelay;
return this;
}
if (!this._handle.setKeepAlive) {
return this;
}
if (enable !== this[kSetKeepAlive] ||
(
enable &&
this[kSetKeepAliveInitialDelay] !== initialDelay
)
) {
this[kSetKeepAlive] = enable;
this[kSetKeepAliveInitialDelay] = initialDelay;
this._handle.setKeepAlive(enable, initialDelay);
}
return this;
};
Socket.prototype.address = function() {
return this._getsockname();
};
ObjectDefineProperty(Socket.prototype, '_connecting', {
__proto__: null,
get: function() {
return this.connecting;
},
});
ObjectDefineProperty(Socket.prototype, 'pending', {
__proto__: null,
get() {
return !this._handle || this.connecting;
},
configurable: true,
});
ObjectDefineProperty(Socket.prototype, 'readyState', {
__proto__: null,
get: function() {
if (this.connecting) {
return 'opening';
} else if (this.readable && this.writable) {
return 'open';
} else if (this.readable && !this.writable) {
return 'readOnly';
} else if (!this.readable && this.writable) {
return 'writeOnly';
}
return 'closed';
},
});
ObjectDefineProperty(Socket.prototype, 'bufferSize', {
__proto__: null,
get: function() {
if (this._handle) {
return this.writableLength;
}
},
});
ObjectDefineProperty(Socket.prototype, kUpdateTimer, {
__proto__: null,
get: function() {
return this._unrefTimer;
},
});
function tryReadStart(socket) {
// Not already reading, start the flow
debug('Socket._handle.readStart');
socket._handle.reading = true;
const err = socket._handle.readStart();
if (err)
socket.destroy(new ErrnoException(err, 'read'));
}
// Just call handle.readStart until we have enough in the buffer
Socket.prototype._read = function(n) {
debug(
'_read - n', n,
'isConnecting?', !!this.connecting,
'hasHandle?', !!this._handle,
);
if (this.connecting || !this._handle) {
debug('_read wait for connection');
this.once('connect', () => this._read(n));
} else if (!this._handle.reading) {
tryReadStart(this);
}
};
Socket.prototype.end = function(data, encoding, callback) {
stream.Duplex.prototype.end.call(this,
data, encoding, callback);
return this;
};
Socket.prototype.resetAndDestroy = function() {
if (this._handle) {
if (!(this._handle instanceof TCP))
throw new ERR_INVALID_HANDLE_TYPE();
if (this.connecting) {
debug('reset wait for connection');
this.once('connect', () => this._reset());
} else {
this._reset();
}
} else {
this.destroy(new ERR_SOCKET_CLOSED());
}
return this;
};
Socket.prototype.pause = function() {
if (this[kBuffer] && !this.connecting && this._handle?.reading) {
this._handle.reading = false;
if (!this.destroyed) {
const err = this._handle.readStop();
if (err)
this.destroy(new ErrnoException(err, 'read'));
}
}
return stream.Duplex.prototype.pause.call(this);
};
Socket.prototype.resume = function() {
if (this[kBuffer] && !this.connecting && this._handle &&
!this._handle.reading) {
tryReadStart(this);
}
return stream.Duplex.prototype.resume.call(this);
};
Socket.prototype.read = function(n) {
if (this[kBuffer] && !this.connecting && this._handle &&
!this._handle.reading) {
tryReadStart(this);
}
return stream.Duplex.prototype.read.call(this, n);
};
// Called when the 'end' event is emitted.
function onReadableStreamEnd() {
if (!this.allowHalfOpen) {
this.write = writeAfterFIN;
}
}
Socket.prototype.destroySoon = function() {
if (this.writable)
this.end();
if (this.writableFinished)
this.destroy();
else
this.once('finish', this.destroy);
};
Socket.prototype._destroy = function(exception, cb) {
debug('destroy');
this.connecting = false;
for (let s = this; s !== null; s = s._parent) {
clearTimeout(s[kTimeout]);
}
debug('close');
if (this._handle) {
if (this !== process.stderr)
debug('close handle');
const isException = exception ? true : false;
// `bytesRead` and `kBytesWritten` should be accessible after `.destroy()`
this[kBytesRead] = this._handle.bytesRead;
this[kBytesWritten] = this._handle.bytesWritten;
if (this.resetAndClosing) {
this.resetAndClosing = false;
const err = this._handle.reset(() => {
debug('emit close');
this.emit('close', isException);
});
if (err)
this.emit('error', new ErrnoException(err, 'reset'));
} else if (this._closeAfterHandlingError) {
// Enqueue closing the socket as a microtask, so that the socket can be
// accessible when an `error` event is handled in the `next tick queue`.
queueMicrotask(() => closeSocketHandle(this, isException, true));
} else {
closeSocketHandle(this, isException);
}
if (!this._closeAfterHandlingError) {
this._handle.onread = noop;
this._handle = null;
this._sockname = null;
}
cb(exception);
} else {
cb(exception);
process.nextTick(emitCloseNT, this);
}
if (this._server) {
debug('has server');
this._server._connections--;
if (this._server._emitCloseIfDrained) {
this._server._emitCloseIfDrained();
}
}
};
Socket.prototype._reset = function() {
debug('reset connection');
this.resetAndClosing = true;
return this.destroy();
};
Socket.prototype._getpeername = function() {
if (!this._handle || !this._handle.getpeername || this.connecting) {
return this._peername || {};
} else if (!this._peername) {
const out = {};
const err = this._handle.getpeername(out);
if (err) return out;
this._peername = out;
}
return this._peername;
};
function protoGetter(name, callback) {
ObjectDefineProperty(Socket.prototype, name, {
__proto__: null,
configurable: false,
enumerable: true,
get: callback,
});
}
protoGetter('bytesRead', function bytesRead() {
return this._handle ? this._handle.bytesRead : this[kBytesRead];
});
protoGetter('remoteAddress', function remoteAddress() {
return this._getpeername().address;
});
protoGetter('remoteFamily', function remoteFamily() {
return this._getpeername().family;
});
protoGetter('remotePort', function remotePort() {
return this._getpeername().port;
});
Socket.prototype._getsockname = function() {
if (!this._handle || !this._handle.getsockname) {
return {};
} else if (!this._sockname) {
this._sockname = {};
// FIXME(bnoordhuis) Throw when the return value is not 0?
this._handle.getsockname(this._sockname);
}
return this._sockname;
};
protoGetter('localAddress', function localAddress() {
return this._getsockname().address;
});
protoGetter('localPort', function localPort() {
return this._getsockname().port;
});
protoGetter('localFamily', function localFamily() {
return this._getsockname().family;
});
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
// waiting for this one to be done.
if (this.connecting) {
this._pendingData = data;
this._pendingEncoding = encoding;
this.once('connect', function connect() {
this.off('close', onClose);
this._writeGeneric(writev, data, encoding, cb);
});
function onClose() {
cb(new ERR_SOCKET_CLOSED_BEFORE_CONNECTION());
}
this.once('close', onClose);
return;
}
this._pendingData = null;
this._pendingEncoding = '';
if (!this._handle) {
cb(new ERR_SOCKET_CLOSED());
return false;
}
this._unrefTimer();
let req;
if (writev)
req = writevGeneric(this, data, cb);
else
req = writeGeneric(this, data, encoding, cb);
if (req.async)
this[kLastWriteQueueSize] = req.bytes;
};
Socket.prototype._writev = function(chunks, cb) {
this._writeGeneric(true, chunks, '', cb);
};
Socket.prototype._write = function(data, encoding, cb) {
this._writeGeneric(false, data, encoding, cb);
};
// Legacy alias. Having this is probably being overly cautious, but it doesn't
// really hurt anyone either. This can probably be removed safely if desired.
protoGetter('_bytesDispatched', function _bytesDispatched() {
return this._handle ? this._handle.bytesWritten : this[kBytesWritten];
});
protoGetter('bytesWritten', function bytesWritten() {
let bytes = this._bytesDispatched;
const data = this._pendingData;
const encoding = this._pendingEncoding;
const writableBuffer = this.writableBuffer;
if (!writableBuffer)
return undefined;
for (const el of writableBuffer) {
bytes += el.chunk instanceof Buffer ?
el.chunk.length :
Buffer.byteLength(el.chunk, el.encoding);