unicorn

rails_env = ENV['RAILS_ENV'] || 'production'

#worker_processes (rails_env == 'production' ? 2 : 2)
worker_processes 4
# Load app into memory for super fast worker spawns
preload_app true

# Restart any workers that haven't responded in 30 seconds
timeout 30

# Listen on a Unix data socket
listen '/etc/unicorn/hecklersports_unicorn.sock', :backlog => 2048

# Set pid location to Capistrano / Rails default
pid '/var/run/hecklersports_unicorn.pid'

# Setup logging paths
stderr_path '/var/log/unicorn/hecklersports_error.log'
stdout_path '/var/log/unicorn/hecklersports_access.log'

working_directory '/srv/heckler/current'

before_fork do |server, worker|
  ##
  # When sent a USR2, Unicorn will suffix its pidfile with .oldbin and
  # immediately start loading up a new version of itself (loaded with a new
  # version of our app). When this new Unicorn is completely loaded
  # it will begin spawning workers. The first worker spawned will check to
  # see if an .oldbin pidfile exists. If so, this means we've just booted up
  # a new Unicorn and need to tell the old one that it can now die. To do so
  # we send it a QUIT.
  #
  # Using this method we get 0 downtime deploys.

  old_pid = '/var/run/hecklersports_unicorn.pid.oldbin'
  if File.exists?(old_pid) && server.pid != old_pid
    begin
      Process.kill("QUIT", File.read(old_pid).to_i)
    rescue Errno::ENOENT, Errno::ESRCH
      # someone else did our job for us
    end
  end
end

after_fork do |server, worker|
  ##
  # Unicorn master loads the app then forks off workers - because of the way
  # Unix forking works, we need to make sure we aren't using any of the parent's
  # sockets, e.g. db connection

  ActiveRecord::Base.establish_connection
  # Redis and Memcached would go here but their connections are established
  # on demand, so the master never opens a socket

  ##
  # Unicorn master is started as root, which is fine, but let's
  # drop the workers to ubuntu:ubuntu
  begin
    uid, gid = Process.euid, Process.egid
    user, group = 'ubuntu', 'ubuntu'
    target_uid = Etc.getpwnam(user).uid
    target_gid = Etc.getgrnam(group).gid
    worker.tmp.chown(target_uid, target_gid)
    if uid != target_uid || gid != target_gid
      Process.initgroups(user, target_gid)
      Process::GID.change_privilege(target_gid)
      Process::UID.change_privilege(target_uid)
    end
  rescue => e
    if RAILS_ENV == 'development'
      STDERR.puts "couldn't change user, oh well"
    else
      raise e
    end
  end
end