unicorn.rb

require 'dotenv'
Dotenv.load

listen ENV.fetch('UNICORN_PORT', 5000), :backlog => ENV.fetch('UNICORN_BACKLOG', 200).to_i
worker_processes ENV.fetch('UNICORN_CONCURRENCY', 3).to_i
timeout ENV.fetch('UNICORN_TIMEOUT', 15).to_i
preload_app true

if ENV.include?('UNICORN_LOG')
  stderr_path ENV.fetch('UNICORN_LOG')
  stdout_path ENV.fetch('UNICORN_LOG')
end

pid ENV.fetch('UNICORN_PID') if ENV.include?('UNICORN_PID')

before_fork do |server, worker|
  if ENV.include?('UNICORN_PID')
    f = File.open("#{server.config[:pid]}.lock", 'w')
    exit unless f.flock(File::LOCK_SH)
  end

  Signal.trap 'TERM' do
    puts 'Unicorn master intercepting TERM and sending myself QUIT instead'
    Process.kill 'QUIT', Process.pid
  end
end

after_fork do |server, worker|
  Signal.trap 'TERM' do
    puts 'Unicorn worker intercepting TERM and doing nothing. Wait for master to send QUIT'
  end
end