Created
June 8, 2016 22:02
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var async = require('async'); | |
var _ = require('underscore'); | |
module.exports = { | |
initialize: function(api, next){ | |
function nullOrErrorResult(err, result) { | |
return (err || result === null || result.length === 0); | |
} | |
//returns a function which takes a callback(err, data) | |
//callback: | |
// - err will be null or contain an error if one occurs | |
// - data will contain an object with: | |
// - 'timestamp': { class, queue, args } | |
function getDelayedTaskSchedule(api) { | |
return function(done) { | |
var scheduler = api.resque.scheduler; | |
var redis = scheduler.connection.redis; | |
redis.zrangebyscore(scheduler.connection.key('delayed_queue_schedule'), '-inf', '+inf', function(err, items) { | |
if (nullOrErrorResult(err, items)) { | |
done(err, {}); | |
} else { | |
async.reduce(items, {}, function(memo, timestamp, callback) { | |
var key = scheduler.connection.key('delayed:' + timestamp); | |
redis.lrange(key, 0, -1, function(err, jobs) { | |
if(err) { | |
callback(err); | |
} else { | |
var jobList = jobs.map(JSON.parse); | |
memo[timestamp] = jobList; | |
callback(null, memo); | |
} | |
}); | |
}, done); | |
} | |
}); | |
}; | |
} | |
//returns a function which takes a callback(err, data) | |
//callback: | |
// - err will be null or contain an error if one occurs | |
// - data will contain an object with: | |
// - 'queuename': [{ class, args }, ... ] | |
function getQueuedTasks(api) { | |
return function(done) { | |
var scheduler = api.resque.scheduler; | |
var redis = scheduler.connection.redis; | |
redis.smembers(scheduler.connection.key('queues'), function(err, queues) { | |
if(nullOrErrorResult(err, queues)) { | |
done(err, {}); | |
} else { | |
async.map(queues, function(queue, callback) { | |
redis.lrange(scheduler.connection.key('queue:' + queue), 0, -1, function(err, items) { | |
var result = { | |
name: queue, | |
items: [] | |
}; | |
if(!nullOrErrorResult(err, items)) { | |
for(var i = 0; i < items.length; i++) { | |
result.items.push(JSON.parse(items[i])); | |
} | |
} | |
callback(err, result); | |
}); | |
}, function(err, queueObjects) { | |
var result = {}; | |
for(var i = 0; i < queueObjects.length; i ++) { | |
var queueItem = queueObjects[i]; | |
result[queueItem.name] = queueItem.items; | |
} | |
done(err, result); | |
}); | |
} | |
}); | |
}; | |
} | |
//returns a function which takes a callback(err, data) | |
//callback: | |
// - err will be null or contain an error if one occurs | |
// - data will contain an object with: | |
// - 'workername': 'idle' | { class, args } | |
function getWorkerStatus(api) { | |
return function(done) { | |
var scheduler = api.resque.scheduler; | |
var redis = scheduler.connection.redis; | |
redis.smembers(scheduler.connection.key('workers'), function(err, workers) { | |
if(nullOrErrorResult(err, workers)) { | |
done(err, {}); | |
} else { | |
async.map(workers, function(workerName, callback) { | |
redis.get(scheduler.connection.key('worker:' + workerName), function(err, statusString) { | |
if(err) { | |
callback(err); | |
} else { | |
var result = {name: workerName}; | |
if(statusString == null) { | |
result.status = 'idle'; | |
} else { | |
var status = JSON.parse(statusString); | |
result.status = status.payload; | |
} | |
callback(null, result); | |
} | |
}); | |
}, function(err, workerItems) { | |
var result = {}; | |
for(var i = 0; i < workerItems.length; i ++) { | |
var workerItem = workerItems[i]; | |
result[workerItem.name] = workerItem.status; | |
} | |
done(err, result); | |
}); | |
} | |
}); | |
}; | |
} | |
//returns a function which takes a callback(err, data) | |
//callback: | |
// - err will be null or contain an error if one occurs | |
// - data will contain an object with: | |
// - 'jobName': {status: 'scheduled', at: timestamp, in: timeToTimestamp} | | |
// {status: 'running', running: 'workerName'} | | |
// {status: 'enqueued', queue: 'queueName'} | | |
// {status: 'dequeued'} | |
function getStatusByJob(api) { | |
return function(done) { | |
var taskList = Object.keys(api.tasks.tasks); | |
var result = {}; | |
for(var i = 0; i < taskList.length; i++) { | |
result[taskList[i]] = { status: 'dequeued' }; | |
} | |
async.parallel({ | |
schedule: getDelayedTaskSchedule(api), | |
queuedTasks: getQueuedTasks(api), | |
workers: getWorkerStatus(api) | |
}, function(err, results) { | |
if(err) { | |
done(err, {}); | |
} else { | |
_.each(results.schedule, function(jobs, timestamp) { | |
var timeToTimestamp = timestamp - Math.round(new Date().getTime() / 1000); | |
_.each(jobs, function(job) { | |
result[job.class] = {status: 'scheduled', at: timestamp, in: timeToTimestamp}; | |
}); | |
}); | |
_.each(results.queuedTasks, function(jobs, queue) { | |
_.each(jobs, function(job) { | |
result[job.class] = {status: 'enqueued', queue: queue}; | |
}); | |
}); | |
_.each(results.workers, function(job, worker) { | |
if(job === 'idle') { | |
return; | |
} else { | |
result[job.class] = {status: 'running', running: worker}; | |
} | |
}); | |
done(null, result); | |
} | |
}); | |
}; | |
} | |
api.resqueHelper = { | |
delayedSchedule: getDelayedTaskSchedule, | |
queuedTasks: getQueuedTasks, | |
workerStatus: getWorkerStatus, | |
jobs: getStatusByJob | |
}; | |
next(); | |
} | |
}; |
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