/
resque.js
executable file
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/
resque.js
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var resque = exports;
var EventEmitter = require ('events').EventEmitter;
var sys = require ('sys');
var redis = require ('redis');
var processAlive = function (pid, cb) {
require('child_process').exec (
"ps -p" + pid + "| wc -l",
function (error, stdout, stderr) {
cb (parseInt (stdout) === 2)
}
)
}
var connectToRedis = function (options) {
return redis.createClient (options.port, options.host);
}
resque.connect = function (options) {
var options = options || {}
var redis = options.redis || connectToRedis(options)
var namespace = options.namespace || 'resque'
var connection = { redis: redis, namespace: namespace }
var key = function () {
var args = Array.prototype.slice.apply (arguments)
args.unshift (namespace)
return args.join (":")
}
var cleanUpWorker = function (identifier, cb) {
sys.puts ("cleaning worker "+identifier)
redis.srem (key ('workers'), identifier, function () {
redis.del ([
key ('worker', identifier)
, key ('worker', identifier, ':started')
, key ('stat', 'failed', identifier)
, key ('stat', 'processed', identifier)
], function () { if (cb) cb () })
})
}
connection.cleanStaleWorkers = function () {
redis.smembers (key ('workers'), function (err, workers) {
if (! workers) return
workers.forEach (function (worker) {
var parts = worker.toString().split(":")
var pid = parts [1]
processAlive (pid, function (isAlive) {
if (!isAlive) cleanUpWorker (worker.toString ())
})
})
})
}
connection.createWorker = function (queues, name, callbacks) {
var worker = new EventEmitter ()
, callbacks = callbacks || {}
, poll = function () {
worker.emit ('poll')
worker.queue = worker.queues.shift ()
worker.queues.push (worker.queue)
redis.lpop (key ("queue", worker.queue), function (err, job) {
if (job)
worker.emit ('job', JSON.parse (job.toString ()))
else
redis.del (
key ('worker', worker.identifier)
, function () { setTimeout (poll, 1000) }
)
})
}
worker.queues = []
if (queues === '*')
redis.smembers (
key ('queues'),
function (err, queues) { worker.queues = queues }
)
else worker.queues =
(typeof queues === 'string') ?
queues.split (",") :
queues
worker.identifier = [
name || 'node', process.pid, queues
].join (":")
sys.puts ("[" + namespace + "] " + worker.identifier)
worker.succeed = function (job) {
redis.incr (key ('stat', 'processed'), function () {
redis.incr (
key ('stat', 'processed', worker.identifier)
, function () { process.nextTick (poll) }
)
})
}
worker.fail = function (job, failure) {
var failure = failure || {}
redis.rpush (
key ('failed')
, JSON.stringify ({
worker: worker.identifier
, error: failure.error || 'unspecified'
, queue : worker.queue
, payload: job
, exception: failure.exception || 'generic'
, backtrace: failure.backtrace || ['unknown']
, failed_at: (new Date ()).toString ()
})
)
redis.incr (key ('stat', 'failed'))
redis.incr (key ('stat', 'failed', worker.identifier))
process.nextTick (poll)
}
worker.addListener ('job', function (job) {
var callback = callbacks [ job.class ]
if (typeof callback === 'function') {
redis.set (
key ('worker', worker.identifier)
, JSON.stringify ({
run_at: (new Date ()).toString ()
, queue: worker.queue
, payload: job
})
)
callback.apply ({
succeed: function () { worker.succeed (job) }
, fail: function (failure) { worker.fail (job, failure) }
, worker: worker
, class: job.class
, args: job.args
}, job.args)
} else
worker.fail (job, {
error: 'No callback for "'+job.class+'"'
, exception: "UnknownClass"
})
})
worker.end = function () {
cleanUpWorker (worker.identifier, function () {
worker.emit ('end')
})
}
worker.finish = function () { poll = worker.end }
worker.start = function () {
redis.sadd (key ('workers'), worker.identifier)
redis.set (
key ('worker', worker.identifier, 'started')
, (new Date ()).toString ()
)
poll ()
return worker
}
return worker
}
connection.enqueue = function (queueName, fnName) {
var args = Array.prototype.slice.call (arguments, 2)
redis.sadd (key ('queues'), queueName)
redis.rpush (
key ('queue', queueName)
, JSON.stringify ({ class: fnName, args: args })
)
}
return connection
}