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concurrency.rb
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concurrency.rb
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# frozen_string_literal: true
require "redis_prescription"
require_relative "./base"
module Sidekiq
module Throttled
class Strategy
# Concurrency throttling strategy
class Concurrency
include Base
# LUA script used to limit fetch concurrency.
# Logic behind the scene can be described in following pseudo code:
#
# if @limit <= LLEN(@key)
# return 1
# else
# PUSH(@key, @jid)
# return 0
# end
SCRIPT = RedisPrescription.new(File.read("#{__dir__}/concurrency.lua"))
private_constant :SCRIPT
# @param [#to_s] strategy_key
# @param [#to_i, #call] limit Amount of allowed concurrent jobs
# per processors running for given key.
# @param [#to_i] ttl Concurrency lock TTL in seconds.
# @param [Proc] key_suffix Dynamic key suffix generator.
def initialize(strategy_key, limit:, ttl: 900, key_suffix: nil)
@base_key = "#{strategy_key}:concurrency.v2"
@limit = limit
@ttl = ttl.to_i
@key_suffix = key_suffix
end
# @return [Boolean] Whenever strategy has dynamic config
def dynamic?
@key_suffix || @limit.respond_to?(:call)
end
# @return [Boolean] whenever job is throttled or not
def throttled?(jid, *job_args)
job_limit = limit(job_args)
return false unless job_limit
return true if job_limit <= 0
keys = [key(job_args)]
argv = [jid.to_s, job_limit, @ttl, Time.now.to_f]
Sidekiq.redis { |redis| 1 == SCRIPT.call(redis, keys: keys, argv: argv) }
end
# @return [Integer] Current count of jobs
def count(*job_args)
Sidekiq.redis { |conn| conn.zcard(key(job_args)) }.to_i
end
# Resets count of jobs
# @return [void]
def reset!(*job_args)
Sidekiq.redis { |conn| conn.del(key(job_args)) }
end
# Remove jid from the pool of jobs in progress
# @return [void]
def finalize!(jid, *job_args)
Sidekiq.redis { |conn| conn.zrem(key(job_args), jid.to_s) }
end
end
end
end
end