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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 inherits = require('util').inherits;
var constants; // if (!constants) constants = process.binding('constants');
var Pipe;
// constructors for lazy loading
function createPipe(ipc) {
// Lazy load
if (!Pipe) {
Pipe = process.binding('pipe_wrap').Pipe;
}
return new 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;
}
function mergeOptions(target, overrides) {
if (overrides) {
var keys = Object.keys(overrides);
for (var i = 0, len = keys.length; i < len; i++) {
var k = keys[i];
if (overrides[k] !== undefined) {
target[k] = overrides[k];
}
}
}
return target;
}
function setupChannel(target, channel) {
target._channel = channel;
var jsonBuffer = '';
channel.buffering = false;
channel.onread = function(pool, offset, length, recvHandle) {
// Update simultaneous accepts on Windows
net._setSimultaneousAccepts(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);
//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, recvHandle);
}
//Non-internal message
else {
target.emit('message', message, recvHandle);
}
start = i + 1;
}
jsonBuffer = jsonBuffer.slice(start);
this.buffering = jsonBuffer.length !== 0;
} else {
this.buffering = false;
target.disconnect();
}
};
target.send = function(message, sendHandle) {
if (typeof message === 'undefined') {
throw new TypeError('message cannot be undefined');
}
if (!this.connected) throw new Error("channel closed");
// For overflow protection don't write if channel queue is too deep.
if (channel.writeQueueSize > 1024 * 1024) {
return false;
}
var buffer = Buffer(JSON.stringify(message) + '\n');
// Update simultaneous accepts on Windows
net._setSimultaneousAccepts(sendHandle);
var writeReq = channel.write(buffer, 0, buffer.length, sendHandle);
if (!writeReq) {
throw errnoException(errno, 'write', 'cannot write to IPC channel.');
}
writeReq.oncomplete = nop;
return true;
};
target.connected = true;
target.disconnect = function() {
if (!this.connected) {
this.emit('error', new Error('IPC channel is already disconnected'));
}
// 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;
if (Array.isArray(arguments[1])) {
args = arguments[1];
options = arguments[2] || {};
} else {
args = [];
options = arguments[1] || {};
}
// Copy args and add modulePath
args = args.slice(0);
args.unshift(modulePath);
// Don't allow stdinStream and customFds since a stdin channel will be used
if (options.stdinStream) {
throw new Error('stdinStream not allowed for fork()');
}
if (options.customFds) {
throw new Error('customFds not allowed for fork()');
}
// Leave stdin open for the IPC channel. stdout and stderr should be the
// same as the parent's if silent isn't set.
options.customFds = (options.silent ? [-1, -1, -1] : [-1, 1, 2]);
// Just need to set this - child process won't actually use the fd.
// For backwards compat - this can be changed to 'NODE_CHANNEL' before v0.6.
if (!options.env) options.env = { };
options.env.NODE_CHANNEL_FD = 42;
// stdin is the IPC channel.
if (!options.thread) options.stdinStream = createPipe(true);
var child = spawn(process.execPath, args, options);
if (!options.thread) setupChannel(child, options.stdinStream);
return child;
};
exports._forkChild = function() {
// set process.send()
var p = createPipe(true);
p.open(0);
setupChannel(process, p);
};
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 = mergeOptions({}, 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',
setsid: false,
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];
if (typeof arguments[2] === 'object') optionArg = arguments[2];
} else {
args = [];
if (typeof arguments[1] === 'object') optionArg = arguments[1];
}
// Merge optionArg into options
mergeOptions(options, optionArg);
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 kill() {
killed = true;
child.kill(options.killSignal);
process.nextTick(function() {
exithandler(null, options.killSignal);
});
}
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('maxBuffer exceeded.');
kill();
}
});
child.stderr.addListener('data', function(chunk) {
stderr += chunk;
if (stderr.length > options.maxBuffer) {
err = new Error('maxBuffer exceeded.');
kill();
}
});
child.addListener('exit', exithandler);
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 = (options && options.thread) ? (new Isolate) : (new ChildProcess);
child.spawn({
file: file,
args: args,
cwd: options ? options.cwd : null,
windowsVerbatimArguments: !!(options && options.windowsVerbatimArguments),
envPairs: envPairs,
customFds: options ? options.customFds : null,
stdinStream: options ? options.stdinStream : null,
options: options
});
return child;
};
function maybeExit(subprocess) {
subprocess._closesGot++;
if (subprocess._closesGot == subprocess._closesNeeded) {
subprocess.emit('exit', subprocess.exitCode, subprocess.signalCode);
}
}
function ChildProcess() {
var self = this;
this._closesNeeded = 1;
this._closesGot = 0;
this.signalCode = null;
this.exitCode = null;
this.killed = false;
this._internal = new Process();
this._internal.onexit = function(exitCode, signalCode) {
//
// follow 0.4.x behaviour:
//
// - normally terminated processes don't touch this.signalCode
// - signaled processes don't touch this.exitCode
//
if (signalCode) {
self.signalCode = signalCode;
} else {
self.exitCode = exitCode;
}
if (self.stdin) {
self.stdin.destroy();
}
self._internal.close();
self._internal = null;
maybeExit(self);
};
}
inherits(ChildProcess, EventEmitter);
function setStreamOption(name, index, options) {
// Skip if we already have options.stdinStream
if (options[name]) return;
if (options.customFds &&
typeof options.customFds[index] == 'number' &&
options.customFds[index] !== -1) {
if (options.customFds[index] === index) {
options[name] = null;
} else {
throw new Error('customFds not yet supported');
}
} else {
options[name] = createPipe();
}
}
ChildProcess.prototype.spawn = function(options) {
var self = this;
setStreamOption('stdinStream', 0, options);
setStreamOption('stdoutStream', 1, options);
setStreamOption('stderrStream', 2, options);
var r = this._internal.spawn(options);
if (r) {
if (options.stdinStream) {
options.stdinStream.close();
}
if (options.stdoutStream) {
options.stdoutStream.close();
}
if (options.stderrStream) {
options.stderrStream.close();
}
this._internal.close();
this._internal = null;
throw errnoException(errno, 'spawn');
}
this.pid = this._internal.pid;
if (options.stdinStream) {
this.stdin = createSocket(options.stdinStream, false);
}
if (options.stdoutStream) {
this.stdout = createSocket(options.stdoutStream, true);
this._closesNeeded++;
this.stdout.on('close', function() {
maybeExit(self);
});
}
if (options.stderrStream) {
this.stderr = createSocket(options.stderrStream, true);
this._closesNeeded++;
this.stderr.on('close', function() {
maybeExit(self);
});
}
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) {
if (!constants) {
constants = process.binding('constants');
}
sig = sig || 'SIGTERM';
var signal = constants[sig];
if (!signal) {
throw new Error('Unknown signal: ' + sig);
}
if (this._internal) {
this.killed = true;
var r = this._internal.kill(signal);
// TODO: raise error if r == -1?
}
};
// Lazy loaded.
var isolates = null;
function Isolate() {
if (!process.features.isolates) {
throw new Error('Compiled without isolates support.');
}
if (!isolates) {
isolates = process.binding('isolates');
}
this._handle = null;
}
inherits(Isolate, EventEmitter); // maybe inherit from ChildProcess?
Isolate.prototype.spawn = function(options) {
var self = this;
if (self._handle) throw new Error('Isolate already running.');
self._handle = isolates.create(options.args, options.options);
if (!self._handle) throw new Error('Cannot create isolate.');
self._handle.onmessage = function(msg, recvHandle) {
msg = JSON.parse('' + msg);
// Update simultaneous accepts on Windows
net._setSimultaneousAccepts(recvHandle);
self.emit('message', msg, recvHandle);
};
self._handle.onexit = function() {
self._handle = null;
self.emit('exit');
};
};
Isolate.prototype.kill = function(sig) {
if (!this._handle) throw new Error('Isolate not running.');
// ignore silently for now, need a way to signal the other thread
};
Isolate.prototype.send = function(msg, sendHandle) {
if (typeof msg === 'undefined') throw new TypeError('Bad argument.');
if (!this._handle) throw new Error('Isolate not running.');
msg = JSON.stringify(msg);
msg = new Buffer(msg);
// Update simultaneous accepts on Windows
net._setSimultaneousAccepts(sendHandle);
return this._handle.send(msg, sendHandle);
};
|