Heroku deploy rake tasks with hooks. Demonstrates how to trigger Sidekiq to quiet or terminate via API before deploy

Rakefile

# List of environments and their heroku git remotes (id: 'remote_name')
HEROKU_ENVIRONMENTS = {
  staging: 'staging-remote-name',
  production: 'production-remote-name'
}

namespace :deploy do
  # Create rake tasks to deploy on Heroku environments
  #   $ rake -T deploy
  #   rake deploy:production  # Deploy to production
  #   rake deploy:staging     # Deploy to stage
  HEROKU_ENVIRONMENTS.keys.each do |heroku_env|
    desc "Deploy to #{ heroku_env }"
    task heroku_env, :skip_hooks do |t, args|
      Rake::Task['deploy:before_deploy'].invoke(heroku_env) unless args[:skip_hooks]
      Rake::Task['deploy:deploy_code'].invoke(heroku_env)
      Rake::Task['deploy:after_deploy'].invoke(heroku_env) unless args[:skip_hooks]
    end
  end

  # Runs before deploy
  task :before_deploy, :heroku_env do |t, args|
    puts "Deploying to #{ args[:heroku_env] }"

    # Call rake sidekiq:quiet on remote
    Bundler.with_clean_env { sh "heroku run rake sidekiq:quiet --remote #{ HEROKU_ENVIRONMENTS[args[:heroku_env]] }" }
  end

  # Doing actual deploy
  task :deploy_code, :heroku_env do |t, args|
    puts "Pushing to #{ HEROKU_ENVIRONMENTS[args[:heroku_env]] }"

    Bundler.with_clean_env { sh "git push #{ HEROKU_ENVIRONMENTS[args[:heroku_env]] } master" }
  end

  # Runs after deploy
  task :after_deploy, :heroku_env do |t, args|
    puts 'Deployment complete'
  end
end

namespace :sidekiq do
  # Remotely trigger Sidekiq to quiet or terminate via API, without signals.
  # This is most useful on JRuby or Heroku which does not support the USR1 'quiet' signal.
  # Now you can run a rake task like this at the start of your deploy to quiet your set of Sidekiq processes.
  task :quiet do
    require 'sidekiq/api'
    Sidekiq::ProcessSet.new.each(&:quiet!)
  end
end