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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.
var EventEmitter = require('events').EventEmitter;
var net = require('net');
var Process = process.binding('process_wrap').Process;
var util = require('util');
var constants; // if (!constants) constants = process.binding('constants');
var handleWraps = {};
function handleWrapGetter(name, callback) {
var cons;
Object.defineProperty(handleWraps, name, {
get: function() {
if (cons !== undefined) return cons;
return cons = callback();
}
});
}
handleWrapGetter('Pipe', function() {
return process.binding('pipe_wrap').Pipe;
});
handleWrapGetter('TTY', function() {
return process.binding('tty_wrap').TTY;
});
handleWrapGetter('TCP', function() {
return process.binding('tcp_wrap').TCP;
});
handleWrapGetter('UDP', function() {
return process.binding('udp_wrap').UDP;
});
// constructors for lazy loading
function createPipe(ipc) {
return new handleWraps.Pipe(ipc);
}
function createSocket(pipe, readable) {
var s = new net.Socket({ handle: pipe });
if (readable) {
s.writable = false;
s.readable = true;
s.resume();
} else {
s.writable = true;
s.readable = false;
}
return s;
}
// this object contain function to convert TCP objects to native handle objects
// and back again.
var handleConversion = {
'net.Native': {
simultaneousAccepts: true,
send: function(message, handle) {
return handle;
},
got: function(message, handle, emit) {
emit(handle);
}
},
'net.Server': {
simultaneousAccepts: true,
send: function(message, server) {
return server._handle;
},
got: function(message, handle, emit) {
var self = this;
var server = new net.Server();
server.listen(handle, function() {
emit(server);
});
}
},
'net.Socket': {
send: function(message, socket) {
// pause socket so no data is lost, will be resumed later
socket.pause();
// if the socket wsa created by net.Server
if (socket.server) {
// the slave should keep track of the socket
message.key = socket.server._connectionKey;
var firstTime = !this._channel.sockets.send[message.key];
// add socket to connections list
var socketList = getSocketList('send', this, message.key);
socketList.add(socket);
// the server should no longer expose a .connection property
// and when asked to close it should query the socket status from slaves
if (firstTime) {
socket.server._setupSlave(socketList);
}
}
// remove handle from socket object, it will be closed when the socket
// has been send
var handle = socket._handle;
handle.onread = function() {};
socket._handle = null;
return handle;
},
got: function(message, handle, emit) {
var socket = new net.Socket({handle: handle});
socket.readable = socket.writable = true;
socket.pause();
// if the socket was created by net.Server we will track the socket
if (message.key) {
// add socket to connections list
var socketList = getSocketList('got', this, message.key);
socketList.add(socket);
}
emit(socket);
socket.resume();
}
}
};
// This object keep track of the socket there are sended
function SocketListSend(slave, key) {
EventEmitter.call(this);
var self = this;
this.key = key;
this.list = [];
this.slave = slave;
slave.once('disconnect', function() {
self.flush();
});
this.slave.on('internalMessage', function(msg) {
if (msg.cmd !== 'NODE_SOCKET_CLOSED' || msg.key !== self.key) return;
self.flush();
});
}
util.inherits(SocketListSend, EventEmitter);
SocketListSend.prototype.add = function(socket) {
this.list.push(socket);
};
SocketListSend.prototype.flush = function() {
var list = this.list;
this.list = [];
list.forEach(function(socket) {
socket.destroy();
});
};
SocketListSend.prototype.update = function() {
if (this.slave.connected === false) return;
this.slave.send({
cmd: 'NODE_SOCKET_FETCH',
key: this.key
});
};
// This object keep track of the socket there are received
function SocketListReceive(slave, key) {
EventEmitter.call(this);
var self = this;
this.key = key;
this.list = [];
this.slave = slave;
slave.on('internalMessage', function(msg) {
if (msg.cmd !== 'NODE_SOCKET_FETCH' || msg.key !== self.key) return;
if (self.list.length === 0) {
self.flush();
return;
}
self.on('itemRemoved', function removeMe() {
if (self.list.length !== 0) return;
self.removeListener('itemRemoved', removeMe);
self.flush();
});
});
}
util.inherits(SocketListReceive, EventEmitter);
SocketListReceive.prototype.flush = function() {
this.list = [];
if (this.slave.connected) {
this.slave.send({
cmd: 'NODE_SOCKET_CLOSED',
key: this.key
});
}
};
SocketListReceive.prototype.add = function(socket) {
var self = this;
this.list.push(socket);
socket.on('close', function() {
self.list.splice(self.list.indexOf(socket), 1);
self.emit('itemRemoved');
});
};
function getSocketList(type, slave, key) {
var sockets = slave._channel.sockets[type];
var socketList = sockets[key];
if (!socketList) {
var Construct = type === 'send' ? SocketListSend : SocketListReceive;
socketList = sockets[key] = new Construct(slave, key);
}
return socketList;
}
function handleMessage(target, message, handle) {
//Filter out internal messages
//if cmd property begin with "_NODE"
if (message !== null &&
typeof message === 'object' &&
typeof message.cmd === 'string' &&
message.cmd.indexOf('NODE_') === 0) {
target.emit('internalMessage', message, handle);
}
//Non-internal message
else {
target.emit('message', message, handle);
}
}
function setupChannel(target, channel) {
target._channel = channel;
var jsonBuffer = '';
channel.buffering = false;
channel.onread = function(pool, offset, length, recvHandle) {
if (pool) {
jsonBuffer += pool.toString('ascii', offset, offset + length);
var i, start = 0;
//Linebreak is used as a message end sign
while ((i = jsonBuffer.indexOf('\n', start)) >= 0) {
var json = jsonBuffer.slice(start, i);
var message = JSON.parse(json);
handleMessage(target, message, recvHandle);
start = i + 1;
}
jsonBuffer = jsonBuffer.slice(start);
this.buffering = jsonBuffer.length !== 0;
} else {
this.buffering = false;
target.disconnect();
channel.onread = nop;
channel.close();
maybeClose(target);
}
};
// object where socket lists will live
channel.sockets = { got: {}, send: {} };
// handlers will go through this
target.on('internalMessage', function(message, handle) {
if (message.cmd !== 'NODE_HANDLE') return;
var obj = handleConversion[message.type];
// Update simultaneous accepts on Windows
if (process.platform === 'win32') {
handle._simultaneousAccepts = false;
net._setSimultaneousAccepts(handle);
}
// Convert handle object
obj.got.call(this, message, handle, function(handle) {
handleMessage(target, message.msg, handle);
});
});
target.send = function(message, handle) {
if (typeof message === 'undefined') {
throw new TypeError('message cannot be undefined');
}
if (!this.connected) {
this.emit('error', new Error('channel closed'));
return;
}
// package messages with a handle object
if (handle) {
// this message will be handled by an internalMessage event handler
message = {
cmd: 'NODE_HANDLE',
type: 'net.',
msg: message
};
switch (handle.constructor.name) {
case 'Socket':
message.type += 'Socket'; break;
case 'Server':
message.type += 'Server'; break;
case 'Pipe':
case 'TCP':
message.type += 'Native'; break;
}
var obj = handleConversion[message.type];
// convert TCP object to native handle object
handle = handleConversion[message.type].send.apply(target, arguments);
// Update simultaneous accepts on Windows
if (obj.simultaneousAccepts) {
net._setSimultaneousAccepts(handle);
}
}
var string = JSON.stringify(message) + '\n';
var writeReq = channel.writeUtf8String(string, handle);
// Close the Socket handle after sending it
if (message && message.type === 'net.Socket') {
handle.close();
}
if (!writeReq) {
var er = errnoException(errno, 'write', 'cannot write to IPC channel.');
this.emit('error', er);
}
writeReq.oncomplete = nop;
/* If the master is > 2 read() calls behind, please stop sending. */
return channel.writeQueueSize < (65536 * 2);
};
target.connected = true;
target.disconnect = function() {
if (!this.connected) {
this.emit('error', new Error('IPC channel is already disconnected'));
return;
}
// do not allow messages to be written
this.connected = false;
this._channel = null;
var fired = false;
function finish() {
if (fired) return;
fired = true;
channel.close();
target.emit('disconnect');
}
// If a message is being read, then wait for it to complete.
if (channel.buffering) {
this.once('message', finish);
this.once('internalMessage', finish);
return;
}
finish();
};
channel.readStart();
}
function nop() { }
exports.fork = function(modulePath /*, args, options*/) {
// Get options and args arguments.
var options, args, execArgv;
if (Array.isArray(arguments[1])) {
args = arguments[1];
options = util._extend({}, arguments[2]);
} else {
args = [];
options = util._extend({}, arguments[1]);
}
// Prepare arguments for fork:
execArgv = options.execArgv || process.execArgv;
args = execArgv.concat([modulePath], args);
// Leave stdin open for the IPC channel. stdout and stderr should be the
// same as the parent's if silent isn't set.
options.stdio = options.silent ? ['pipe', 'pipe', 'pipe', 'ipc'] :
[0, 1, 2, 'ipc'];
return spawn(process.execPath, args, options);
};
exports._forkChild = function(fd) {
// set process.send()
var p = createPipe(true);
p.open(fd);
p.unref();
setupChannel(process, p);
var refs = 0;
process.on('newListener', function(name) {
if (name !== 'message' && name !== 'disconnect') return;
if (++refs === 1) p.ref();
});
process.on('removeListener', function(name) {
if (name !== 'message' && name !== 'disconnect') return;
if (--refs === 0) p.unref();
});
};
exports.exec = function(command /*, options, callback */) {
var file, args, options, callback;
if (typeof arguments[1] === 'function') {
options = undefined;
callback = arguments[1];
} else {
options = arguments[1];
callback = arguments[2];
}
if (process.platform === 'win32') {
file = 'cmd.exe';
args = ['/s', '/c', '"' + command + '"'];
// Make a shallow copy before patching so we don't clobber the user's
// options object.
options = util._extend({}, options);
options.windowsVerbatimArguments = true;
} else {
file = '/bin/sh';
args = ['-c', command];
}
return exports.execFile(file, args, options, callback);
};
exports.execFile = function(file /* args, options, callback */) {
var args, optionArg, callback;
var options = {
encoding: 'utf8',
timeout: 0,
maxBuffer: 200 * 1024,
killSignal: 'SIGTERM',
cwd: null,
env: null
};
// Parse the parameters.
if (typeof arguments[arguments.length - 1] === 'function') {
callback = arguments[arguments.length - 1];
}
if (Array.isArray(arguments[1])) {
args = arguments[1];
options = util._extend(options, arguments[2]);
} else {
args = [];
options = util._extend(options, arguments[1]);
}
var child = spawn(file, args, {
cwd: options.cwd,
env: options.env,
windowsVerbatimArguments: !!options.windowsVerbatimArguments
});
var stdout = '';
var stderr = '';
var killed = false;
var exited = false;
var timeoutId;
var err;
function exithandler(code, signal) {
if (exited) return;
exited = true;
if (timeoutId) {
clearTimeout(timeoutId);
timeoutId = null;
}
if (!callback) return;
if (err) {
callback(err, stdout, stderr);
} else if (code === 0 && signal === null) {
callback(null, stdout, stderr);
} else {
var e = new Error('Command failed: ' + stderr);
e.killed = child.killed || killed;
e.code = code;
e.signal = signal;
callback(e, stdout, stderr);
}
}
function errorhandler(e) {
err = e;
child.stdout.destroy();
child.stderr.destroy();
exithandler();
}
function kill() {
child.stdout.destroy();
child.stderr.destroy();
killed = true;
try {
child.kill(options.killSignal);
} catch (e) {
err = e;
exithandler();
}
}
if (options.timeout > 0) {
timeoutId = setTimeout(function() {
kill();
timeoutId = null;
}, options.timeout);
}
child.stdout.setEncoding(options.encoding);
child.stderr.setEncoding(options.encoding);
child.stdout.addListener('data', function(chunk) {
stdout += chunk;
if (stdout.length > options.maxBuffer) {
err = new Error('stdout maxBuffer exceeded.');
kill();
}
});
child.stderr.addListener('data', function(chunk) {
stderr += chunk;
if (stderr.length > options.maxBuffer) {
err = new Error('stderr maxBuffer exceeded.');
kill();
}
});
child.addListener('close', exithandler);
child.addListener('error', errorhandler);
return child;
};
var spawn = exports.spawn = function(file, args, options) {
args = args ? args.slice(0) : [];
args.unshift(file);
var env = (options ? options.env : null) || process.env;
var envPairs = [];
for (var key in env) {
envPairs.push(key + '=' + env[key]);
}
var child = new ChildProcess();
if (options && options.customFds && !options.stdio) {
options.stdio = options.customFds.map(function(fd) {
return fd === -1 ? 'pipe' : fd;
});
}
child.spawn({
file: file,
args: args,
cwd: options ? options.cwd : null,
windowsVerbatimArguments: !!(options && options.windowsVerbatimArguments),
detached: !!(options && options.detached),
envPairs: envPairs,
stdio: options ? options.stdio : null,
uid: options ? options.uid : null,
gid: options ? options.gid : null
});
return child;
};
function maybeClose(subprocess) {
subprocess._closesGot++;
if (subprocess._closesGot == subprocess._closesNeeded) {
subprocess.emit('close', subprocess.exitCode, subprocess.signalCode);
}
}
function ChildProcess() {
EventEmitter.call(this);
var self = this;
this._closesNeeded = 1;
this._closesGot = 0;
this.signalCode = null;
this.exitCode = null;
this.killed = false;
this._handle = new Process();
this._handle.owner = this;
this._handle.onexit = function(exitCode, signalCode) {
//
// follow 0.4.x behaviour:
//
// - normally terminated processes don't touch this.signalCode
// - signaled processes don't touch this.exitCode
//
// new in 0.9.x:
//
// - spawn failures are reported with exitCode == -1
//
var err = (exitCode == -1) ? errnoException(errno, 'spawn') : null;
if (signalCode) {
self.signalCode = signalCode;
} else {
self.exitCode = exitCode;
}
if (self.stdin) {
self.stdin.destroy();
}
self._handle.close();
self._handle = null;
if (exitCode == -1) {
self.emit('error', err);
} else {
self.emit('exit', self.exitCode, self.signalCode);
}
maybeClose(self);
};
}
util.inherits(ChildProcess, EventEmitter);
function getHandleWrapType(stream) {
if (stream instanceof handleWraps.Pipe) return 'pipe';
if (stream instanceof handleWraps.TTY) return 'tty';
if (stream instanceof handleWraps.TCP) return 'tcp';
if (stream instanceof handleWraps.UDP) return 'udp';
return false;
}
ChildProcess.prototype.spawn = function(options) {
var self = this,
ipc,
ipcFd,
// If no `stdio` option was given - use default
stdio = options.stdio || 'pipe';
// Replace shortcut with an array
if (typeof stdio === 'string') {
switch (stdio) {
case 'ignore': stdio = ['ignore', 'ignore', 'ignore']; break;
case 'pipe': stdio = ['pipe', 'pipe', 'pipe']; break;
case 'inherit': stdio = [0, 1, 2]; break;
default: throw new TypeError('Incorrect value of stdio option: ' + stdio);
}
} else if (!Array.isArray(stdio)) {
throw new TypeError('Incorrect value of stdio option: ' + stdio);
}
// At least 3 stdio will be created
// Don't concat() a new Array() because it would be sparse, and
// stdio.reduce() would skip the sparse elements of stdio.
// See http://stackoverflow.com/a/5501711/3561
while (stdio.length < 3) stdio.push(undefined);
// Translate stdio into C++-readable form
// (i.e. PipeWraps or fds)
stdio = stdio.reduce(function(acc, stdio, i) {
function cleanup() {
acc.filter(function(stdio) {
return stdio.type === 'pipe' || stdio.type === 'ipc';
}).forEach(function(stdio) {
stdio.handle.close();
});
}
// Defaults
if (stdio === undefined || stdio === null) {
stdio = i < 3 ? 'pipe' : 'ignore';
}
if (stdio === 'ignore') {
acc.push({type: 'ignore'});
} else if (stdio === 'pipe' || typeof stdio === 'number' && stdio < 0) {
acc.push({type: 'pipe', handle: createPipe()});
} else if (stdio === 'ipc') {
if (ipc !== undefined) {
// Cleanup previously created pipes
cleanup();
throw Error('Child process can have only one IPC pipe');
}
ipc = createPipe(true);
ipcFd = i;
acc.push({ type: 'pipe', handle: ipc, ipc: true });
} else if (typeof stdio === 'number' || typeof stdio.fd === 'number') {
acc.push({ type: 'fd', fd: stdio.fd || stdio });
} else if (getHandleWrapType(stdio) || getHandleWrapType(stdio.handle) ||
getHandleWrapType(stdio._handle)) {
var handle = getHandleWrapType(stdio) ?
stdio :
getHandleWrapType(stdio.handle) ? stdio.handle : stdio._handle;
acc.push({
type: 'wrap',
wrapType: getHandleWrapType(handle),
handle: handle
});
} else {
// Cleanup
cleanup();
throw new TypeError('Incorrect value for stdio stream: ' + stdio);
}
return acc;
}, []);
options.stdio = stdio;
if (ipc !== undefined) {
// Let child process know about opened IPC channel
options.envPairs = options.envPairs || [];
options.envPairs.push('NODE_CHANNEL_FD=' + ipcFd);
}
var r = this._handle.spawn(options);
if (r) {
// Close all opened fds on error
stdio.forEach(function(stdio) {
if (stdio.type === 'pipe') {
stdio.handle.close();
}
});
this._handle.close();
this._handle = null;
throw errnoException(errno, 'spawn');
}
this.pid = this._handle.pid;
stdio.forEach(function(stdio, i) {
if (stdio.type === 'ignore') return;
if (stdio.ipc) {
self._closesNeeded++;
return;
}
if (stdio.handle) {
// when i === 0 - we're dealing with stdin
// (which is the only one writable pipe)
stdio.socket = createSocket(stdio.handle, i > 0);
if (i > 0) {
self._closesNeeded++;
stdio.socket.on('close', function() {
maybeClose(self);
});
}
}
});
this.stdin = stdio.length >= 1 && stdio[0].socket !== undefined ?
stdio[0].socket : null;
this.stdout = stdio.length >= 2 && stdio[1].socket !== undefined ?
stdio[1].socket : null;
this.stderr = stdio.length >= 3 && stdio[2].socket !== undefined ?
stdio[2].socket : null;
this.stdio = stdio.map(function(stdio) {
return stdio.socket === undefined ? null : stdio.socket;
});
// Add .send() method and start listening for IPC data
if (ipc !== undefined) setupChannel(this, ipc);
return r;
};
function errnoException(errorno, syscall, errmsg) {
// TODO make this more compatible with ErrnoException from src/node.cc
// Once all of Node is using this function the ErrnoException from
// src/node.cc should be removed.
var message = syscall + ' ' + errorno;
if (errmsg) {
message += ' - ' + errmsg;
}
var e = new Error(message);
e.errno = e.code = errorno;
e.syscall = syscall;
return e;
}
ChildProcess.prototype.kill = function(sig) {
var signal;
if (!constants) {
constants = process.binding('constants');
}
if (sig === 0) {
signal = 0;
} else if (!sig) {
signal = constants['SIGTERM'];
} else {
signal = constants[sig];
}
if (signal === undefined) {
throw new Error('Unknown signal: ' + sig);
}
if (this._handle) {
var r = this._handle.kill(signal);
if (r == 0) {
/* Success. */
this.killed = true;
return true;
} else if (errno == 'ESRCH') {
/* Already dead. */
} else if (errno == 'EINVAL' || errno == 'ENOSYS') {
/* The underlying platform doesn't support this signal. */
throw errnoException(errno, 'kill');
} else {
/* Other error, almost certainly EPERM. */
this.emit('error', errnoException(errno, 'kill'));
}
}
/* Kill didn't succeed. */
return false;
};
ChildProcess.prototype.ref = function() {
if (this._handle) this._handle.ref();
};
ChildProcess.prototype.unref = function() {
if (this._handle) this._handle.unref();
};