clockwork + sidekiq integration

clock.rb

require 'clockwork'
require 'sidekiq'

# load all jobs from app/jobs directory
# no need to load rails env, we only care about classes 
# (#perform method is not invoked in this process)
Dir["app/jobs/*"].each {|f| load f } 

module Clockwork
  every(1.day, 'midnight.job', :at => '00:00'){
    MidnightJob.perform_async(1,2,3) 
  }
end

Note that Sidekiq has a perform_at method, which might be more accurate because of polling times, etc. For maximum accuracy, I would rewrite the above as:

every(1.day, 'midnight.job', at: '23:59') do
  t = Time.new Time.at(Time.new+100).to_s.sub(/\s.+\s/," 00:00:00 ")
  # ^ There must be a better way to do this, can't think right now.

  MidnightJob.perform_at t, 1, 2, 3
end

which simply executes a minute before midnight, and schedules a job to be run at exactly midnight.

Not a good choice skip rails if you are using different configuration for Redis.