Module: Resque

Extended by:
Forwardable, Resque
Includes:
Helpers
Included in:
Resque
Defined in:
lib/resque.rb,
lib/resque/job.rb,
lib/resque/stat.rb,
lib/resque/errors.rb,
lib/resque/plugin.rb,
lib/resque/server.rb,
lib/resque/worker.rb,
lib/resque/failure.rb,
lib/resque/helpers.rb,
lib/resque/logging.rb,
lib/resque/version.rb,
lib/resque/data_store.rb,
lib/resque/failure/base.rb,
lib/resque/failure/redis.rb,
lib/resque/failure/airbrake.rb,
lib/resque/failure/multiple.rb,
lib/resque/server/test_helper.rb,
lib/resque/failure/redis_multi_queue.rb,
lib/resque/log_formatters/quiet_formatter.rb,
lib/resque/log_formatters/verbose_formatter.rb,
lib/resque/log_formatters/very_verbose_formatter.rb

Defined Under Namespace

Modules: Failure, Helpers, Logging, Plugin, Stat, TestHelper Classes: DataStore, DirtyExit, Job, NoClassError, NoQueueError, PruneDeadWorkerDirtyExit, QuietFormatter, Server, TermException, ThreadSignal, VerboseFormatter, VeryVerboseFormatter, Worker

Constant Summary collapse

DEFAULT_HEARTBEAT_INTERVAL = 
60
DEFAULT_PRUNE_INTERVAL = 
DEFAULT_HEARTBEAT_INTERVAL * 5
Version = 
VERSION = '2.0.0'

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#enqueue_front ⇒ Object 



214
215
216
217
218
219
220
 
# File 'lib/resque.rb', line 214

def enqueue_front
  if defined? @enqueue_front
    @enqueue_front
  else
    @enqueue_front = false
  end
end

#heartbeat_interval ⇒ Object 



191
192
193
194
195
196
197
 
# File 'lib/resque.rb', line 191

def heartbeat_interval
  if defined? @heartbeat_interval
    @heartbeat_interval
  else
    DEFAULT_HEARTBEAT_INTERVAL
  end
end

#inline ⇒ Object Also known as: inline?

Returns the value of attribute inline.



294
295
296
 
# File 'lib/resque.rb', line 294

def inline
  @inline
end

#logger ⇒ Object

Set or retrieve the current logger object



183
184
185
 
# File 'lib/resque.rb', line 183

def logger
  @logger
end

#prune_interval ⇒ Object 



201
202
203
204
205
206
207
 
# File 'lib/resque.rb', line 201

def prune_interval
  if defined? @prune_interval
    @prune_interval
  else
    DEFAULT_PRUNE_INTERVAL
  end
end

Instance Method Details

#after_fork(&block) ⇒ Object

The ‘after_fork` hook will be run in the child process and is passed the current job. Any changes you make, therefore, will only live as long as the job currently being processed.

Call with a block to register a hook. Call with no arguments to return all registered hooks.



259
260
261
 
# File 'lib/resque.rb', line 259

def after_fork(&block)
  block ? register_hook(:after_fork, block) : hooks(:after_fork)
end

#after_fork=(block) ⇒ Object

Register an after_fork proc.



264
265
266
 
# File 'lib/resque.rb', line 264

def after_fork=(block)
  register_hook(:after_fork, block)
end

#after_pause(&block) ⇒ Object

The ‘after_pause` hook will be run in the parent process after the worker has paused (via SIGCONT).



281
282
283
 
# File 'lib/resque.rb', line 281

def after_pause(&block)
  block ? register_hook(:after_pause, block) : hooks(:after_pause)
end

#after_pause=(block) ⇒ Object

Register an after_pause proc.



286
287
288
 
# File 'lib/resque.rb', line 286

def after_pause=(block)
  register_hook(:after_pause, block)
end

#before_first_fork(&block) ⇒ Object

The ‘before_first_fork` hook will be run in the parent process only once, before forking to run the first job. Be careful- any changes you make will be permanent for the lifespan of the worker.

Call with a block to register a hook. Call with no arguments to return all registered hooks.



229
230
231
 
# File 'lib/resque.rb', line 229

def before_first_fork(&block)
  block ? register_hook(:before_first_fork, block) : hooks(:before_first_fork)
end

#before_first_fork=(block) ⇒ Object

Register a before_first_fork proc.



234
235
236
 
# File 'lib/resque.rb', line 234

def before_first_fork=(block)
  register_hook(:before_first_fork, block)
end

#before_fork(&block) ⇒ Object

The ‘before_fork` hook will be run in the parent process before every job, so be careful- any changes you make will be permanent for the lifespan of the worker.

Call with a block to register a hook. Call with no arguments to return all registered hooks.



244
245
246
 
# File 'lib/resque.rb', line 244

def before_fork(&block)
  block ? register_hook(:before_fork, block) : hooks(:before_fork)
end

#before_fork=(block) ⇒ Object

Register a before_fork proc.



249
250
251
 
# File 'lib/resque.rb', line 249

def before_fork=(block)
  register_hook(:before_fork, block)
end

#before_pause(&block) ⇒ Object

The ‘before_pause` hook will be run in the parent process before the worker has paused processing (via #pause_processing or SIGUSR2).



270
271
272
 
# File 'lib/resque.rb', line 270

def before_pause(&block)
  block ? register_hook(:before_pause, block) : hooks(:before_pause)
end

#before_pause=(block) ⇒ Object

Register a before_pause proc.



275
276
277
 
# File 'lib/resque.rb', line 275

def before_pause=(block)
  register_hook(:before_pause, block)
end

#classify(dashed_word) ⇒ Object

Given a word with dashes, returns a camel cased version of it.

classify(‘job-name’) # => ‘JobName’



58
59
60
 
# File 'lib/resque.rb', line 58

def classify(dashed_word)
  dashed_word.split('-').map(&:capitalize).join
end

#constantize(camel_cased_word) ⇒ Object

Tries to find a constant with the name specified in the argument string:

constantize(“Module”) # => Module constantize(“Test::Unit”) # => Test::Unit

The name is assumed to be the one of a top-level constant, no matter whether it starts with “::” or not. No lexical context is taken into account:

C = ‘outside’ module M

C = 'inside'
C # => 'inside'
constantize("C") # => 'outside', same as ::C

end

NameError is raised when the constant is unknown.



79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
 
# File 'lib/resque.rb', line 79

def constantize(camel_cased_word)
  camel_cased_word = camel_cased_word.to_s

  if camel_cased_word.include?('-')
    camel_cased_word = classify(camel_cased_word)
  end

  names = camel_cased_word.split('::')
  names.shift if names.empty? || names.first.empty?

  constant = Object
  names.each do |name|
    args = Module.method(:const_get).arity != 1 ? [false] : []

    if constant.const_defined?(name, *args)
      constant = constant.const_get(name)
    else
      constant = constant.const_missing(name)
    end
  end
  constant
end

#decode(object) ⇒ Object

Given a string, returns a Ruby object.



41
42
43
44
45
46
47
48
49
50
51
52
53
 
# File 'lib/resque.rb', line 41

def decode(object)
  return unless object

  begin
    if MultiJson.respond_to?(:dump) && MultiJson.respond_to?(:load)
      MultiJson.load object
    else
      MultiJson.decode object
    end
  rescue ::MultiJson::DecodeError => e
    raise Helpers::DecodeException, e.message, e.backtrace
  end
end

#dequeue(klass, *args) ⇒ Object

This method can be used to conveniently remove a job from a queue. It assumes the class you’re passing it is a real Ruby class (not a string or reference) which either:

a) has a @queue ivar set
b) responds to `queue`

If either of those conditions are met, it will use the value obtained from performing one of the above operations to determine the queue.

If no queue can be inferred this method will raise a ‘Resque::NoQueueError`

If no args are given, this method will dequeue all jobs matching the provided class. See ‘Resque::Job.destroy` for more information.

Returns the number of jobs destroyed.

Example:

# Removes all jobs of class `UpdateNetworkGraph`
Resque.dequeue(GitHub::Jobs::UpdateNetworkGraph)

# Removes all jobs of class `UpdateNetworkGraph` with matching args.
Resque.dequeue(GitHub::Jobs::UpdateNetworkGraph, 'repo:135325')

This method is considered part of the ‘stable` API.



458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
 
# File 'lib/resque.rb', line 458

def dequeue(klass, *args)
  # Perform before_dequeue hooks. Don't perform dequeue if any hook returns false
  before_hooks = Plugin.before_dequeue_hooks(klass).collect do |hook|
    klass.send(hook, *args)
  end
  return if before_hooks.any? { |result| result == false }

  destroyed = Job.destroy(queue_from_class(klass), klass, *args)

  Plugin.after_dequeue_hooks(klass).each do |hook|
    klass.send(hook, *args)
  end

  destroyed
end

#encode(object) ⇒ Object

Given a Ruby object, returns a string suitable for storage in a queue.



32
33
34
35
36
37
38
 
# File 'lib/resque.rb', line 32

def encode(object)
  if MultiJson.respond_to?(:dump) && MultiJson.respond_to?(:load)
    MultiJson.dump object
  else
    MultiJson.encode object
  end
end

#enqueue(klass, *args) ⇒ Object

This method can be used to conveniently add a job to a queue. It assumes the class you’re passing it is a real Ruby class (not a string or reference) which either:

a) has a @queue ivar set
b) responds to `queue`

If either of those conditions are met, it will use the value obtained from performing one of the above operations to determine the queue.

If no queue can be inferred this method will raise a ‘Resque::NoQueueError`

Returns true if the job was queued, nil if the job was rejected by a before_enqueue hook.

This method is considered part of the ‘stable` API.



402
403
404
 
# File 'lib/resque.rb', line 402

def enqueue(klass, *args)
  enqueue_to(queue_from_class(klass), klass, *args)
end

#enqueue_to(queue, klass, *args) ⇒ Object

Just like ‘enqueue` but allows you to specify the queue you want to use. Runs hooks.

‘queue` should be the String name of the queue you’re targeting.

Returns true if the job was queued, nil if the job was rejected by a before_enqueue hook.

This method is considered part of the ‘stable` API.



415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
 
# File 'lib/resque.rb', line 415

def enqueue_to(queue, klass, *args)
  # Perform before_enqueue hooks. Don't perform enqueue if any hook returns false
  before_hooks = Plugin.before_enqueue_hooks(klass).collect do |hook|
    klass.send(hook, *args)
  end
  return nil if before_hooks.any? { |result| result == false }

  Job.create(queue, klass, *args)

  Plugin.after_enqueue_hooks(klass).each do |hook|
    klass.send(hook, *args)
  end

  return true
end

#info ⇒ Object

Returns a hash, similar to redis-rb’s #info, of interesting stats.



534
535
536
537
538
539
540
541
542
543
544
545
 
# File 'lib/resque.rb', line 534

def info
  return {
    :pending   => queue_sizes.inject(0) { |sum, (_queue_name, queue_size)| sum + queue_size },
    :processed => Stat[:processed],
    :queues    => queues.size,
    :workers   => workers.size.to_i,
    :working   => working.size,
    :failed    => data_store.num_failed,
    :servers   => [redis_id],
    :environment  => ENV['RAILS_ENV'] || ENV['RACK_ENV'] || 'development'
  }
end

#keys ⇒ Object

Returns an array of all known Resque keys in Redis. Redis’ KEYS operation is O(N) for the keyspace, so be careful - this can be slow for big databases.



549
550
551
 
# File 'lib/resque.rb', line 549

def keys
  data_store.all_resque_keys
end

#list_range(key, start = 0, count = 1) ⇒ Object

Does the dirty work of fetching a range of items from a Redis list and converting them into Ruby objects.



356
357
358
359
360
361
362
363
 
# File 'lib/resque.rb', line 356

def list_range(key, start = 0, count = 1)
  results = data_store.list_range(key, start, count)
  if count == 1
    decode(results)
  else
    results.map { |result| decode(result) }
  end
end

#peek(queue, start = 0, count = 1) ⇒ Object

Returns an array of items currently queued. Queue name should be a string.

start and count should be integer and can be used for pagination. start is the item to begin, count is how many items to return.

To get the 3rd page of a 30 item, paginatied list one would use:

Resque.peek('my_list', 59, 30)



345
346
347
348
349
350
351
352
 
# File 'lib/resque.rb', line 345

def peek(queue, start = 0, count = 1)
  results = data_store.peek_in_queue(queue,start,count)
  if count == 1
    decode(results)
  else
    results.map { |result| decode(result) }
  end
end

#pop(queue) ⇒ Object

Pops a job off a queue. Queue name should be a string.

Returns a Ruby object.



327
328
329
 
# File 'lib/resque.rb', line 327

def pop(queue)
  decode(data_store.pop_from_queue(queue))
end

#push(queue, item) ⇒ Object

Pushes a job onto a queue. Queue name should be a string and the item should be any JSON-able Ruby object.

Resque works generally expect the ‘item` to be a hash with the following keys:

class - The String name of the job to run.
 args - An Array of arguments to pass the job. Usually passed
        via `class.to_class.perform(*args)`.

Example

Resque.push('archive', :class => 'Archive', :args => [ 35, 'tar' ])

Returns nothing



320
321
322
 
# File 'lib/resque.rb', line 320

def push(queue, item)
  data_store.push_to_queue(queue,encode(item))
end

#queue_from_class(klass) ⇒ Object

Given a class, try to extrapolate an appropriate queue based on a class instance variable or ‘queue` method.



476
477
478
479
 
# File 'lib/resque.rb', line 476

def queue_from_class(klass)
  (klass.instance_variable_defined?(:@queue) && klass.instance_variable_get(:@queue)) ||
    (klass.respond_to?(:queue) and klass.queue)
end

#queue_sizes ⇒ Object

Returns a hash, mapping queue names to queue sizes



554
555
556
557
558
559
560
561
562
563
564
 
# File 'lib/resque.rb', line 554

def queue_sizes
  queue_names = queues

  sizes = redis.pipelined do
    queue_names.each do |name|
      redis.llen("queue:#{name}")
    end
  end

  Hash[queue_names.zip(sizes)]
end

#queues ⇒ Object

Returns an array of all known Resque queues as strings.



366
367
368
 
# File 'lib/resque.rb', line 366

def queues
  data_store.queue_names
end

#redis ⇒ Object Also known as: data_store

Returns the current Redis connection. If none has been created, will create a new one.



139
140
141
142
143
 
# File 'lib/resque.rb', line 139

def redis
  return @data_store if @data_store
  self.redis = Redis.respond_to?(:connect) ? Redis.connect : "localhost:6379"
  self.redis
end

#redis=(server) ⇒ Object

Accepts:

1. A 'hostname:port' String
2. A 'hostname:port:db' String (to select the Redis db)
3. A 'hostname:port/namespace' String (to set the Redis namespace)
4. A Redis URL String 'redis://host:port'
5. An instance of `Redis`, `Redis::Client`, `Redis::DistRedis`,
   or `Redis::Namespace`.
6. An Hash of a redis connection {:host => 'localhost', :port => 6379, :db => 0}



112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
 
# File 'lib/resque.rb', line 112

def redis=(server)
  case server
  when String
    if server =~ /rediss?\:\/\//
      redis = Redis.new(:url => server, :thread_safe => true)
    else
      server, namespace = server.split('/', 2)
      host, port, db = server.split(':')
      redis = Redis.new(:host => host, :port => port,
        :thread_safe => true, :db => db)
    end
    namespace ||= :resque

    @data_store = Resque::DataStore.new(Redis::Namespace.new(namespace, :redis => redis))
  when Redis::Namespace
    @data_store = Resque::DataStore.new(server)
  when Resque::DataStore
    @data_store = server
  when Hash
    @data_store = Resque::DataStore.new(Redis::Namespace.new(:resque, :redis => Redis.new(server)))
  else
    @data_store = Resque::DataStore.new(Redis::Namespace.new(:resque, :redis => server))
  end
end

#redis_id ⇒ Object 



146
147
148
 
# File 'lib/resque.rb', line 146

def redis_id
  data_store.identifier
end

#remove_queue(queue) ⇒ Object

Given a queue name, completely deletes the queue.



371
372
373
 
# File 'lib/resque.rb', line 371

def remove_queue(queue)
  data_store.remove_queue(queue)
end

#remove_worker(worker_id) ⇒ Object

A shortcut to unregister_worker useful for command line tool



524
525
526
527
 
# File 'lib/resque.rb', line 524

def remove_worker(worker_id)
  worker = Resque::Worker.find(worker_id)
  worker.unregister_worker
end

#reserve(queue) ⇒ Object

This method will return a ‘Resque::Job` object or a non-true value depending on whether a job can be obtained. You should pass it the precise name of a queue: case matters.

This method is considered part of the ‘stable` API.



486
487
488
 
# File 'lib/resque.rb', line 486

def reserve(queue)
  Job.reserve(queue)
end

#sample_queues(sample_size = 1000) ⇒ Object

Returns a hash, mapping queue names to (up to ‘sample_size`) samples of jobs in that queue



567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
 
# File 'lib/resque.rb', line 567

def sample_queues(sample_size = 1000)
  queue_names = queues

  samples = redis.pipelined do
    queue_names.each do |name|
      key = "queue:#{name}"
      redis.llen(key)
      redis.lrange(key, 0, sample_size - 1)
    end
  end

  hash = {}

  queue_names.zip(samples.each_slice(2).to_a) do |queue_name, (queue_size, serialized_samples)|
    samples = serialized_samples.map do |serialized_sample|
      Job.decode(serialized_sample)
    end

    hash[queue_name] = {
      :size => queue_size,
      :samples => samples
    }
  end

  hash
end

#size(queue) ⇒ Object

Returns an integer representing the size of a queue. Queue name should be a string.



333
334
335
 
# File 'lib/resque.rb', line 333

def size(queue)
  data_store.queue_size(queue)
end

#stat_data_store ⇒ Object

Returns the data store for the statistics module.



178
179
180
 
# File 'lib/resque.rb', line 178

def stat_data_store
  Resque::Stat.data_store
end

#stat_data_store=(stat_data_store) ⇒ Object

Set the data store for the processed and failed statistics.

By default it uses the same as ‘Resque.redis`, but different stores can be used.

A custom store needs to obey the following API to work correctly

class NullDataStore

# Returns the current value for the given stat.
def stat(stat)
end

# Increments the stat by the given value.
def increment_stat(stat, by)
end

# Decrements the stat by the given value.
def decrement_stat(stat, by)
end

# Clear the values for the given stat.
def clear_stat(stat)
end

end



173
174
175
 
# File 'lib/resque.rb', line 173

def stat_data_store=(stat_data_store)
  Resque::Stat.data_store = stat_data_store
end

#to_s ⇒ Object 



290
291
292
 
# File 'lib/resque.rb', line 290

def to_s
  "Resque Client connected to #{redis_id}"
end

#validate(klass, queue = nil) ⇒ Object

Validates if the given klass could be a valid Resque job

If no queue can be inferred this method will raise a ‘Resque::NoQueueError`

If given klass is nil this method will raise a ‘Resque::NoClassError`



495
496
497
498
499
500
501
502
503
504
505
 
# File 'lib/resque.rb', line 495

def validate(klass, queue = nil)
  queue ||= queue_from_class(klass)

  if !queue
    raise NoQueueError.new("Jobs must be placed onto a queue. No queue could be inferred for class #{klass}")
  end

  if klass.to_s.empty?
    raise NoClassError.new("Jobs must be given a class.")
  end
end

#watch_queue(queue) ⇒ Object

Used internally to keep track of which queues we’ve created. Don’t call this directly.



377
378
379
 
# File 'lib/resque.rb', line 377

def watch_queue(queue)
  data_store.watch_queue(queue)
end

#workers ⇒ Object

A shortcut to Worker.all



513
514
515
 
# File 'lib/resque.rb', line 513

def workers
  Worker.all
end

#working ⇒ Object

A shortcut to Worker.working



518
519
520
 
# File 'lib/resque.rb', line 518

def working
  Worker.working
end