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.



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# File 'lib/sidekiq/api.rb', line 758

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.



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# File 'lib/sidekiq/api.rb', line 764

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 = procs.select.with_index { |proc, i|
      heartbeats[i].nil?
    }
    count = conn.srem("processes", to_prune) unless to_prune.empty?
  end
  count
end

#each ⇒ Object 



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# File 'lib/sidekiq/api.rb', line 785

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

    # 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
    conn.pipelined do
      procs.each do |key|
        conn.hmget(key, "info", "busy", "beat", "quiet")
      end
    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

#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.



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

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.



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# File 'lib/sidekiq/api.rb', line 814

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