Start multiple consumers with a single command

[laurynas]

I'm not using Racecar, just want to share the script which I implemented when testing Racecar. It is just a proof of concept, never used in production. Just sharing it in case someone would find it useful.

You allows starting multiple consumer processes with a single script.

bin/racecar_pool:

#!/usr/bin/env ruby

require 'yaml'

rails_env = ENV.fetch('RAILS_ENV', 'development')
config_file = File.expand_path('../config/racecar_pool.yml', __dir__)

config = YAML
  .load_file(config_file)
  .fetch(rails_env)

consumers = config.fetch('consumers')

pids = consumers.map do |consumer|
  spawn("bundle exec racecar #{consumer}")
end

signals = %w(TERM INT HUP QUIT SIGUSR1)

signals.each do |signal|
  Signal.trap(signal) do
    Process.kill(signal, *pids)
  end
end

Process.waitall

Consumers configuration file, config/racecar_pool.yml:

default: &default
  consumers:
    - PingConsumer
    - MyConsumer

development:
  <<: *default

test:
  <<: *default

production:
  <<: *default

[dasch]

Another option is to use Foreman to accomplish this.