Module: Resque::Integration::Unique

Defined in:
lib/resque/integration/unique.rb

Overview

Unique job

Examples:

class MyJob
  include Resque::Integration

  # jobs are considered as equal if their first argument is the same
  unique { |*args| args.first }

  def self.execute(image_id)
    # do it
  end
end

MyJob.enqueue(11)

Defined Under Namespace

Modules: Overrides

Constant Summary collapse

LOCK_TIMEOUT =

3 days

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Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.extended(base) ⇒ Object 



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# File 'lib/resque/integration/unique.rb', line 26

def self.extended(base)
  if base.singleton_class.include?(::Resque::Integration::Priority)
    raise 'Uniqueness should be enabled before Prioritness'
  end

  base.extend(::Resque::Plugins::Progress)
  base.singleton_class.prepend(Overrides)
end

Instance Method Details

#after_dequeue_lock(_meta_id, *args) ⇒ Object

When job is dequeued we should remove lock



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# File 'lib/resque/integration/unique.rb', line 146

def after_dequeue_lock(_meta_id, *args)
  unlock(*args) unless args.empty?
end

#after_dequeue_meta(*args) ⇒ Object

Fail metadata if dequeue succeed



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# File 'lib/resque/integration/unique.rb', line 151

def after_dequeue_meta(*args)
  if (meta_id = args.first) && (meta = get_meta(meta_id))
    meta.fail!
  end
end

#around_perform_lock(_meta_id, *args) ⇒ Object 



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# File 'lib/resque/integration/unique.rb', line 138

def around_perform_lock(_meta_id, *args)
  yield
ensure
  # Always clear the lock when we're done, even if there is an error.
  unlock(*args)
end

#before_dequeue_lock(*args) ⇒ Object

Before dequeue check if job is running



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# File 'lib/resque/integration/unique.rb', line 116

def before_dequeue_lock(*args)
  (meta_id = args.first) &&
  (meta = get_meta(meta_id)) &&
  !meta.working?
end

#before_enqueue_lock(_meta_id, *args) ⇒ Object

Before enqueue acquire a lock

Returns boolean



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# File 'lib/resque/integration/unique.rb', line 134

def before_enqueue_lock(_meta_id, *args)
  ::Resque.redis.set(lock_id(*args), 1, ex: lock_timeout, nx: true)
end

#dequeue(*args) ⇒ Object

Dequeue unique job



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# File 'lib/resque/integration/unique.rb', line 173

def dequeue(*args)
  ::Resque.dequeue(self, meta_id(*args), *args)
end

#enqueue_to(queue, *args) ⇒ Object 



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# File 'lib/resque/integration/unique.rb', line 177

def enqueue_to(queue, *args)
  meta = enqueued?(*args)
  return meta if meta.present?

  meta = ::Resque::Plugins::Meta::Metadata.new('meta_id' => meta_id(args), 'job_class' => to_s)
  meta.save

  ::Resque.enqueue_to(queue, self, meta.meta_id, *args)
  meta
end

#enqueued?(*args) ⇒ Boolean

Is job already in queue or in process?

Returns:

  • (Boolean) 


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# File 'lib/resque/integration/unique.rb', line 158

def enqueued?(*args)
  # if lock exists and timeout not exceeded
  get_meta(meta_id(*args)) if locked?(*args)
end

#execute ⇒ Object

Raises:

  • (NotImplementedError) 


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# File 'lib/resque/integration/unique.rb', line 106

def execute(*)
  raise NotImplementedError, "You should implement `execute' method"
end

#lock_id(*args) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

LockID should be independent from MetaID



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# File 'lib/resque/integration/unique.rb', line 89

def lock_id(*args)
  args = args.map { |i| i.is_a?(Hash) ? i.with_indifferent_access : i }
  locked_args = lock_on.call(*args)
  encoded_args = ::Digest::SHA1.hexdigest(obj_to_string(locked_args))
  "lock:#{name}-#{encoded_args}"
end

#lock_on(&block) ⇒ Object

Get or set proc returning unique arguments



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# File 'lib/resque/integration/unique.rb', line 79

def lock_on(&block)
  if block_given?
    @unique = block
  else
    @unique ||= proc { |*args| args }
  end
end

#lock_timeout ⇒ Object 



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# File 'lib/resque/integration/unique.rb', line 163

def lock_timeout
  LOCK_TIMEOUT
end

#locked?(*args) ⇒ Boolean

Returns true if resque job is in locked state

Returns:

  • (Boolean) 


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# File 'lib/resque/integration/unique.rb', line 168

def locked?(*args)
  ::Resque.redis.exists(lock_id(*args))
end

#meta ⇒ Object

get meta object associated with job



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# File 'lib/resque/integration/unique.rb', line 97

def meta
  get_meta(@meta_id)
end

#on_failure_lock(_e, _meta_id, *args) ⇒ Object

When job is failed we should remove lock



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# File 'lib/resque/integration/unique.rb', line 111

def on_failure_lock(_e, _meta_id, *args)
  unlock(*args)
end

#on_failure_retry(exception, *args) ⇒ Object 



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# File 'lib/resque/integration/unique.rb', line 122

def on_failure_retry(exception, *args)
  return unless defined?(super)

  # Keep meta_id if kill -9 (or ABRT)
  @meta_id = args.first if exception.is_a?(::Resque::DirtyExit)

  super
end

#perform(meta_id, *args) ⇒ Object

default ‘perform` method override



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# File 'lib/resque/integration/unique.rb', line 102

def perform(meta_id, *args)
  execute(*args)
end

#retry_args(meta_id, *args) ⇒ Object

Метод вызывает resque-retry когда ставить отложенное задание здесь мы убираем meta_id из аргументов



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# File 'lib/resque/integration/unique.rb', line 63

def retry_args(meta_id, *args)
  args
end

#retry_identifier(*args) ⇒ Object

Метод вызывает resque-retry, когда записывает/читает число перезапусков

- во время работы воркера первым аргументом передается meta_id;
- во время чтения из вебинтерфейса, meta_id не передается, т.к. она выкидывается во время перепостановки
джоба(см retry_args);
- если метод вызывается в пользовательском коде(и @meta_id отсутствует), то meta_id нельзя передавать.



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# File 'lib/resque/integration/unique.rb', line 72

def retry_identifier(*args)
  return if args.empty?
  args.shift if @meta_id.is_a?(String) && !@meta_id.empty? && @meta_id == args.first
  lock_id(*args)
end

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

Метод вызывает resque-scheduler чтобы поставить задание в текущую очередь



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# File 'lib/resque/integration/unique.rb', line 57

def scheduled(queue, klass, *args)
  klass.constantize.enqueue_to(queue, *args)
end

#unique? ⇒ Boolean

Returns true because job is unique now

Returns:

  • (Boolean) 


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# File 'lib/resque/integration/unique.rb', line 52

def unique?
  true
end