Configure sidekiq via ENV variables

sidekiq.rb

Sidekiq.configure_server do |config|
  ENV["SIDEKIQ_NAMESPACE"]   && config.options[:namespace] = ENV["SIDEKIQ_NAMESPACE"]
  ENV["SIDEKIQ_CONCURRENCY"] && config.options[:concurrency] = ENV["SIDEKIQ_CONCURRENCY"].to_i
  ENV["SIDEKIQ_VERBOSE"]     && config.options[:verbose] = ENV["SIDEKIQ_VERBOSE"] === 'true'
  ENV["SIDEKIQ_LOGFILE"]     && config.options[:logfile] = ENV["SIDEKIQ_LOGFILE"]
  ENV["SIDEKIQ_PIDFILE"]     && config.options[:pidfile] = ENV["SIDEKIQ_PIDFILE"]

  config.options[:strict] = true

  if ENV["SIDEKIQ_QUEUES"]
    queues = []

    ENV["SIDEKIQ_QUEUES"].split(/\s+/).each do |queue_weighted|
      queue, count = queue_weighted.split(",")

      count = count.to_i

      if count > 0
        config.options[:strict] = false
      end

      [count, 1].max.times do
        queues.push(queue)
      end
    end

    config.options[:queues] = queues
  end
end

queues should look like this:

SIDEKIQ_QUEUES: "default,2 critical,4 another_queue"

Neat!