Module: Resque::DynamicQueues

Defined in:
lib/resque/dynamic_queues.rb

Constant Summary collapse

DEFAULT_QUEUE_DEPTH = 
0

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.included(receiver) ⇒ Object 



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# File 'lib/resque/dynamic_queues.rb', line 122

def self.included(receiver)
  receiver.class_eval do
    alias queues_without_dynamic queues
    alias queues queues_with_dynamic
    alias reserve_without_round_robin reserve
    alias reserve reserve_with_round_robin
  end
end

Instance Method Details

#filter_busy_queues(qs) ⇒ Object 



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# File 'lib/resque/dynamic_queues.rb', line 3

def filter_busy_queues qs
  busy_queues = Resque::Worker.working.map { |worker| worker.job["queue"] }.compact
  Array(qs.dup).compact - busy_queues
end

#queue_depth(queuename) ⇒ Object 



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# File 'lib/resque/dynamic_queues.rb', line 20

def queue_depth queuename
  busy_queues = Resque::Worker.working.map { |worker| worker.job["queue"] }.compact
  # find the queuename, count it.
  busy_queues.select {|q| q == queuename }.size
end

#queues_with_dynamic ⇒ Object

Returns a list of queues to use when searching for a job.

A splat (“*”) means you want every queue (in alpha order) - this can be useful for dynamically adding new queues.

The splat can also be used as a wildcard within a queue name, e.g. “high”, and negation can be indicated with a prefix of “!”

An @key can be used to dynamically look up the queue list for key from redis. If no key is supplied, it defaults to the worker’s hostname, and wildcards and negations can be used inside this dynamic queue list. Set the queue list for a key with Resque.set_dynamic_queue(key, [“q1”, “q2”]



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# File 'lib/resque/dynamic_queues.rb', line 72

def queues_with_dynamic
  queue_names = @queues.dup
  
  return queues_without_dynamic if queue_names.grep(/(^!)|(^@)|(\*)/).size == 0

  real_queues = Resque.queues
  matched_queues = []

  #Remove Queues under Api Limits
  api_limit_instances = Redis.current.keys('APILimits:*').map {|key| key.split('APILimits:').last.to_i}
  real_queues = real_queues.select {|key| key if !api_limit_instances.include?((key.match(/^(\d*)_.*/) || [])[1].to_i)}
  
  #Queue Pausing 
  paused_instances = Redis.current.keys('resque:PauseQueue:*').map {|key| key.split('resque:PauseQueue:').last.to_i}
  real_queues = real_queues.select {|key| key if !paused_instances.include?((key.match(/^(\d*)_.*/) || [])[1].to_i)}

  while q = queue_names.shift
    q = q.to_s

    if q =~ /^(!)?@(.*)/
      key = $2.strip
      key = hostname if key.size == 0

      add_queues = Resque.get_dynamic_queue(key)
      add_queues.map! { |q| q.gsub!(/^!/, '') || q.gsub!(/^/, '!') } if $1

      queue_names.concat(add_queues)
      next
    end

    if q =~ /^!/
      negated = true
      q = q[1..-1]
    end

    patstr = q.gsub(/\*/, '.*')
    pattern = /^#{patstr}$/
    if negated
      matched_queues -= matched_queues.grep(pattern)
    else
      matches = real_queues.grep(/^#{pattern}$/)
      matches = [q] if matches.size == 0 && q == patstr
      matched_queues.concat(matches.sort)
    end
  end
 
  return matched_queues.uniq
end

#reserve_with_round_robin ⇒ Object 



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# File 'lib/resque/dynamic_queues.rb', line 40

def reserve_with_round_robin
  qs = rotated_queues
  qs.each do |queue|
    log! "Checking #{queue}"
    if should_work_on_queue?(queue) && @job_in_progress = Resque::Job.reserve(queue)
      log! "Found job on #{queue}"
      return @job_in_progress
    end
    # Start the next search at the queue after the one from which we pick a job.
    @n += 1
  end

  nil
rescue Exception => e
  log "Error reserving job: #{e.inspect}"
  log e.backtrace.join("\n")
  raise e
end

#rotated_queues ⇒ Object 



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# File 'lib/resque/dynamic_queues.rb', line 8

def rotated_queues
  @n ||= 0
  @n += 1
  rot_queues = queues # since we rely on the resque-dynamic-queues plugin, this is all the queues, expanded out
  if rot_queues.size > 0
    @n = @n % rot_queues.size
    rot_queues.rotate(@n)
  else
    rot_queues
  end
end

#should_work_on_queue?(queuename) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/resque/dynamic_queues.rb', line 27

def should_work_on_queue? queuename
  return true if @queues.include? '*'  # workers with QUEUES=* are special and are not subject to queue depth setting
  max = DEFAULT_QUEUE_DEPTH
  unless ENV["RESQUE_QUEUE_DEPTH"].nil? || ENV["RESQUE_QUEUE_DEPTH"] == ""
    max = ENV["RESQUE_QUEUE_DEPTH"].to_i
  end
  return true if max == 0 # 0 means no limiting
  cur_depth = queue_depth(queuename)
  log! "queue #{queuename} depth = #{cur_depth} max = #{max}"
  return true if cur_depth < max
  false
end