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fugue.js
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fugue.js
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var the_server;
var workers = [];
var workers_started = 0;
var server_socket;
var master_socket_path;
var master_server;
var killer, respawner;
var isMaster = exports.isMaster = function() {
return !process.env._FUGUE_WORKER;
}
var workerId = exports.workerId = function() {
return process.env._FUGUE_WORKER !== undefined ? parseInt(process.env._FUGUE_WORKER) : null;
}
var masterSocketPath = exports.masterSocketPath = function() {
return master_socket_path;
}
exports.workerPids = function() {
var worker_pids = [];
workers.forEach(function(worker) {
worker_pids.push(worker.pid);
});
return worker_pids;
}
var stop = exports.stop = function() {
if (isMaster()) {
workers.forEach(function(worker) {
worker.listeners('exit').forEach(function(listener) {
worker.removeListener('exit', listener);
});
worker.kill();
});
workers = [];
netBinding = process.binding('net');
if (server_socket) netBinding.close(server_socket);
if (the_server) {
the_server.watcher.stop();
the_server = null;
}
server_socket = null;
if (master_server) {
master_server.close();
}
master_server = null;
process.removeListener('SIGINT', killer);
process.removeListener('SIGHUP', killer);
process.removeListener('SIGTERM', killer);
process.removeListener('SIGUSR2', respawner);
}
}
exports.start = function(server, port, host, worker_count, options) {
the_server = server;
function isPort (x) { return parseInt(x) >= 0; }
var unix_socket_path = null;
if (!isPort(port)) {
// shift arguments
in_options = worker_count;
worker_count = host;
unix_socket_path = port;
}
// merge options
var default_options = {
working_path : process.cwd(),
tmp_path : '/tmp',
uid : process.getuid(),
gid : process.getgid(),
daemonize: false,
verbose: false,
worker_to_master_ping_interval: 30000
}
if (options) {
(function(obj1, obj2) {
for (attrname in obj2) { obj1[attrname] = obj2[attrname]; }
})(default_options, options);
}
options = default_options;
var path = require('path');
// check if paths exist
if (!path.existsSync(options.tmp_path)) {
throw "Temp path " + options.tmp_path + " does not exist. Please create it";
}
if (!path.existsSync(options.working_path)) {
throw "Working path " + options.working_path + " does not exist. Please create it";
}
// setup log function
var log = options.verbose ?
function(what) { console.log(what); } :
function() {};
// Master or worker?
var worker_id = process.env._FUGUE_WORKER;
var is_master = !worker_id;
// daemonize?
if (is_master && options.daemonize) {
log('daemonizing ' + process.pid);
daemon = require(__dirname + '/../build/default/daemon');
daemon.setSid();
log('daemonized');
}
// require needed modules
var net = require('net'),
http = require('http'),
spawn = require('child_process').spawn,
sys = require('sys'),
fs = require('fs'),
path = require('path'),
netBinding = process.binding('net');
// Redirect stdout and stderr
if (options.log_file) {
fs.close(process.stdout.fd);
process.stdout.fd = fs.openSync(options.log_file, 'a');
}
// calculate master_socket_path.
// It can come from env if we have been spawned or we have to create a new one
master_socket_path = null;
if (process.env._FUGUE_MASTER_SOCKET_PATH) {
master_socket_path = process.env._FUGUE_MASTER_SOCKET_PATH;
}
log('Using master socket path: ' + master_socket_path);
if (is_master) { // Master
var old_master_socket_path = process.env._FUGUE_MASTER_SOCKET_PATH;
master_socket_path = process.env._FUGUE_MASTER_SOCKET_PATH = path.join(options.tmp_path, 'fugue_' + process.pid + '_master.sock');
process.umask(0077);
// If we are respawned from another master we have to setsid anyway
if (process.env._FUGUE_ORIG_MASTER_PID) {
daemon = require(__dirname + '/../build/default/daemon');
daemon.setSid();
}
log('Starting new master...');
if (options.master_log_file) {
fs.close(process.stdout.fd);
process.stdout.fd = fs.openSync(options.master_log_file, 'w');
}
if ((process.env._FUGUE_PORT || process.env._FUGUE_SOCKET) && process.env._FUGUE_ORIG_MASTER_PID) { // we were respawned by another master
try {
log('Trying to get socket back from original server...');
// request socket to original server
// this startup part has to work synchronously, so we dig deep into the bindings...
var client_socket = netBinding.socket('unix');
log('connecting to ' + old_master_socket_path);
netBinding.connect(client_socket, old_master_socket_path);
var request_buffer = new Buffer("GIMME_SOCKET\n", 'ascii');
netBinding.write(client_socket, request_buffer, 0, request_buffer.length);
var responseBuffer = new Buffer(256);
var length = null;
// Node returns length and sets (or not) fd by design as explained in node_net.cc / RecvMsg
do {
length = netBinding.recvMsg(client_socket, responseBuffer, 0, responseBuffer.length)
} while(!netBinding.recvMsg.fd);
log('Got response from server:' + responseBuffer.toString('ascii', 0, length));
server_socket = netBinding.recvMsg.fd;
} catch(error) {
log('Error trying to get server file descriptor: ' + error.message);
}
if (!server_socket) {
log('Failed to get socket from original server.');
log('Now I\'m going to try to create one...')
}
}
if (!server_socket) {
// Now we have to create a socket
if (unix_socket_path) {
// UNIX socket
// remove socket file if it exists
try {
fs.unlinkSync(unix_socket_path);
} catch(err) {
// do nothing, file does not exist
}
server_socket = netBinding.socket('unix');
netBinding.bind(server_socket, unix_socket_path);
process.env._FUGUE_SOCKET = unix_socket_path;
} else {
// TCP socket
server_socket = netBinding.socket('tcp' + (netBinding.isIP(host) == 6 ? 6 : 4));
netBinding.bind(server_socket, port, host);
process.env._FUGUE_PORT = port;
process.env._FUGUE_HOST = host;
}
netBinding.listen(server_socket, 128);
}
master_server = net.createServer(function(conn) {
require('carrier').carry(conn, function(command){
switch(command.toString()) {
case 'GIMME_SOCKET':
log('serving server socket file descriptor ' + server_socket);
conn.write('HERE_YOU_GO', 'ascii', server_socket);
break
case 'LISTENING':
workers_started ++;
if (options.started && workers_started == worker_count) options.started();
break;
case 'PING':
conn.write("PONG\n");
break;
}
});
});
master_server.listen(master_socket_path, function() {
workers = [];
workers_started = 0;
var spawn_worker = function(worker_idx) {
// prepare environment for worker
var env = {};
for (var i in process.env) {
env[i] = process.env[i];
}
env._FUGUE_WORKER = "" + (worker_idx + 1);
var args = process.argv;
// spawn worker process
var stdio = process.binding("stdio");
var fds = [ stdio.stdinFD, process.stdout.fd, stdio.stderrFD ];
var new_worker = workers[worker_idx] = spawn(args[0], args.slice(1), {env: env, customFds: fds});
// listen for when the worker dies and bring him back to life
new_worker.on('exit', function() {
log('Child ' + worker_idx + ' died. Respawning it.');
spawn_worker(worker_idx);
});
}
log('Spawning workers...');
process.env._FUGUE_WORKER_COUNT = worker_count;
for (var worker_idx = 0; worker_idx < worker_count; worker_idx ++) {
spawn_worker(worker_idx);
}
log('spawned.')
killer = function() {
stop();
process.nextTick(function() {
process.exit();
});
}
// Listen for process exits
process.on('SIGINT', killer);
process.on('SIGHUP', killer);
process.on('SIGTERM', killer);
// Listen to SIGUSR2 for master restarts
respawner = function() {
log('Got SIGUSR2, respawning self');
// respawn self
var env = {};
for(var i in process.env){
env[i] = process.env[i];
}
env._FUGUE_ORIG_MASTER_PID = process.pid.toString();
var args = process.argv;
// spawn worker process
spawned = spawn(args[0], args.slice(1), env);
spawned.stdout.on('data', function(data) {
log("New master goes: " + data);
});
}
process.on('SIGUSR2', respawner);
// Save master PID
if (options.master_pid_path) {
fs.writeFile(options.master_pid_path, process.pid.toString(), function(error) {
if (error) throw "Error saving master PID file in " + options.master_pid_path + ': ' + error;
});
}
});
} else { // Worker
log('Worker here');
// track connections here
var connection_count = 0;
var die_soon = false; // tells if worker should die after serving exisiting connections
// Setup killer
var worker_killer = function() {
if(connection_count == 0) {
process.nextTick(function() {
process.exit();
});
} else {
// Stop listening for new connections - remove watcher from the event loop
server.watcher.stop();
// Set process to die after serving existing connections
die_soon = true;
}
}
process.on('SIGINT', worker_killer);
process.on('SIGHUP', worker_killer);
process.on('SIGTERM', worker_killer);
process.on('exit', function() {
log("Worker " + worker_id + " exiting.");
});
var connection = net.createConnection(master_socket_path);
connection.on('connect', function() {
connection.write("GIMME_SOCKET\n");
connection.flush();
connection.on('fd', function(fd) {
var kill_master_pid = parseInt(process.env._FUGUE_ORIG_MASTER_PID);
// only the last worker tries to kill original master
if (!!kill_master_pid && workerId() == process.env._FUGUE_WORKER_COUNT) {
log('killing original master');
process.kill(kill_master_pid);
}
// change working dir
if (process.cwd() != options.working_path) {
process.chdir(options.working_path);
}
// set gid
if(process.getgid() != options.gid) {
process.setgid(options.gid);
}
// set uid
if(process.getuid() != options.uid) {
process.setuid(options.uid);
}
server.listenFD(fd);
connection.end("LISTENING\n");
});
});
// Setup to ping master and die if it fails
setInterval(function() {
var ping_connection = net.createConnection(master_socket_path);
ping_connection.on('connect', function() {
ping_connection.write("PING\n");
require('carrier').carry(ping_connection, function(response) {
if(response == 'PONG') ping_connection.end();
})
});
ping_connection.on('error', function(error) {
log('ping error to server: '+error);
log('going to shutdown because of it');
worker_killer();
});
}, options.worker_to_master_ping_interval);
// Track connections so we don't die in the middle of serving one
server.on('connection', function(connection) {
connection_count ++;
connection.on('end', function() {
connection_count --;
if (die_soon && connection_count == 0) {
process.exit();
}
});
});
}
}