Sidekiq auto finish once zero jobs to process

config--initializers--sidekiq.rb

# Enable sidekiq auto quit feature (Allows to enable/disable this feature)
# ENV['SIDEKIQ_QUIT_WHEN_EMPTY'] = true/false

# Apply manager patch
require_relative '../lib/sidekiq_manager_patch'
require 'sidekiq/manager'
Sidekiq::Manager.send :prepend, SidekiqManagerPatch

# Add auto quit middleware
require_relative '../lib/sidekiq_quit_when_empty'
Sidekiq.configure_server do |config|
  config.server_middleware do |chain|
    chain.add SidekiqQuitWhenEmpty
  end
end

lib--sidekiq_manager_patch.rb

module SidekiqManagerPatch
  def start
    super
    SidekiqQuitWhenEmpty.kill_process if SidekiqQuitWhenEmpty.enabled? && SidekiqQuitWhenEmpty.empty_queues?
  end
end

lib--sidekiq_quit_when_empty.rb

# frozen_string_literal: true

class SidekiqQuitWhenEmpty
  delegate :enabled?, :empty_queues?, :kill_process, :empty_processes?, to: :class

  def call(_worker, _msg, _queue)
    yield
    kill_process if enabled? && empty_queues? && empty_processes?
  end

  def self.kill_process
    process = current_process
    Sidekiq.logger.info "Stopping Sidekiq because all configured queues are empty: #{Sidekiq.options[:queues]}"
    process ? process.stop! : Sidekiq.logger.info("Sidekiq process not found to stop")
  end

  def self.current_process
    @retry = @retry ? @retry + 1 : 1
    ps = Sidekiq::ProcessSet.new
    process = ps.detect { |p| Process.pid == p['pid'] }
    if !process && @retry < 5
      sleep(2 * @retry)
      process = current_process
    end
    process
  end

  def self.empty_queues?
    (Sidekiq.options[:queues] || []).all? { |q| Sidekiq::Queue.new(q).size == 0 }
  end

  def self.enabled?
    ENV["SIDEKIQ_QUIT_WHEN_EMPTY"].present?
  end

  def self.empty_processes?
    queues = Sidekiq.options[:queues]
    current_processes = Sidekiq::ProcessSet.new.select { |p| (queues & p['queues']).any? }
    qty_workers = current_processes.map { |p| p['busy'] }.inject(&:+)
    qty_workers <= 1 # take into account the current worker
  end
end

run.bash

bundle exec SIDEKIQ_QUIT_WHEN_EMPTY=true sidekiq -c config/sidekiq.yml