Class: Sidekiq::ProcessSet

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/sidekiq/api.rb

Overview

Enumerates the set of Sidekiq processes which are actively working right now. Each process sends a heartbeat to Redis every 5 seconds so this set should be relatively accurate, barring network partitions.

Yields a Sidekiq::Process.

Instance Method Summary collapse

Constructor Details

#initialize(clean_plz = true) ⇒ ProcessSet

Returns a new instance of ProcessSet.



760
761
762
 
# File 'lib/sidekiq/api.rb', line 760

def initialize(clean_plz = true)
  cleanup if clean_plz
end

Instance Method Details

#cleanup ⇒ Object

Cleans up dead processes recorded in Redis. Returns the number of processes cleaned.



766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
 
# File 'lib/sidekiq/api.rb', line 766

def cleanup
  count = 0
  Sidekiq.redis do |conn|
    procs = conn.sscan_each("processes").to_a.sort
    heartbeats = conn.pipelined {
      procs.each do |key|
        conn.hget(key, "info")
      end
    }

    # the hash named key has an expiry of 60 seconds.
    # if it's not found, that means the process has not reported
    # in to Redis and probably died.
    to_prune = []
    heartbeats.each_with_index do |beat, i|
      to_prune << procs[i] if beat.nil?
    end
    count = conn.srem("processes", to_prune) unless to_prune.empty?
  end
  count
end

#each ⇒ Object 



788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
 
# File 'lib/sidekiq/api.rb', line 788

def each
  procs = Sidekiq.redis { |conn| conn.sscan_each("processes").to_a }.sort

  Sidekiq.redis do |conn|
    # We're making a tradeoff here between consuming more memory instead of
    # making more roundtrips to Redis, but if you have hundreds or thousands of workers,
    # you'll be happier this way
    result = conn.pipelined {
      procs.each do |key|
        conn.hmget(key, "info", "busy", "beat", "quiet")
      end
    }

    result.each do |info, busy, at_s, quiet|
      # If a process is stopped between when we query Redis for `procs` and
      # when we query for `result`, we will have an item in `result` that is
      # composed of `nil` values.
      next if info.nil?

      hash = Sidekiq.load_json(info)
      yield Process.new(hash.merge("busy" => busy.to_i, "beat" => at_s.to_f, "quiet" => quiet))
    end
  end

  nil
end

#leader ⇒ Object

Returns the identity of the current cluster leader or “” if no leader. This is a Sidekiq Enterprise feature, will always return “” in Sidekiq or Sidekiq Pro.



826
827
828
829
830
831
832
833
 
# File 'lib/sidekiq/api.rb', line 826

def leader
  @leader ||= begin
    x = Sidekiq.redis { |c| c.get("dear-leader") }
    # need a non-falsy value so we can memoize
    x ||= ""
    x
  end
end

#size ⇒ Object

This method is not guaranteed accurate since it does not prune the set based on current heartbeat. #each does that and ensures the set only contains Sidekiq processes which have sent a heartbeat within the last 60 seconds.



819
820
821
 
# File 'lib/sidekiq/api.rb', line 819

def size
  Sidekiq.redis { |conn| conn.scard("processes") }
end