Class: RedUnicorn::Unicorn

Inherits:
Object
  • Object
show all
Defined in:
lib/red_unicorn/unicorn.rb

Instance Method Summary collapse

Constructor Details

#initialize(opts = {}) ⇒ Unicorn

pid

Path to unicorn PID file

return_codes

Hash of return codes (defined in executable bin file)

exec_path

Path to unicorn executable

Create a new instance of unicorn interactor



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# File 'lib/red_unicorn/unicorn.rb', line 20

def initialize(opts={})
  @opts = {
    :pid => '/var/run/unicorn/unicorn.pid',
    :exec_path => '/var/www/shared/bundle/bin/unicorn_rails',
    :config_path => '/etc/unicorn/app.rb',
    :action_timeout => 30,
    :restart_grace => 8,
    :env => 'production',
    :kind => 'unicorn'
  }.merge(opts)
  check_exec_path
end

Instance Method Details

#add_child ⇒ Object

Add new worker process



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# File 'lib/red_unicorn/unicorn.rb', line 94

def add_child
  process_is :running do
    Process.kill('TTIN', pid)
  end
end

#halt ⇒ Object

Halts the current unicorn process



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# File 'lib/red_unicorn/unicorn.rb', line 48

def halt
  process_is :running do
    Process.kill('TERM', pid)
  end
end

#reload ⇒ Object

Reload unicorn configuration



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# File 'lib/red_unicorn/unicorn.rb', line 87

def reload
  process_is :running do
    Process.kill('HUP', pid)
  end
end

#remove_all_children ⇒ Object

Stops all worker processes but keeps the master process alive



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# File 'lib/red_unicorn/unicorn.rb', line 109

def remove_all_children
  process_is :running do
    Process.kill('WINCH', pid)
  end
end

#remove_child ⇒ Object

Remove worker process



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# File 'lib/red_unicorn/unicorn.rb', line 101

def remove_child
  process_is :running do
    Process.kill('TTOU', pid)
  end
end

#reopen_logs ⇒ Object

Reopen log files



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# File 'lib/red_unicorn/unicorn.rb', line 116

def reopen_logs
  process_is :running do
    Process.kill('USR1', pid)
  end
end

#restart ⇒ Object

Graceful restart



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# File 'lib/red_unicorn/unicorn.rb', line 55

def restart
  begin
    process_is :running do
      original_pid = pid
      Process.kill('USR2', pid)
      sleep(@opts[:restart_grace]) # give unicorn some breathing room
      waited = 0
      until((File.exists?(@opts[:pid]) && is_running? && !child_pids(pid).empty?) || waited > @opts[:action_timeout])
        sleep_start = Time.now.to_f
        sleep(0.2)
        waited += Time.now.to_f - sleep_start
      end
      if(pid == original_pid || waited > @opts[:action_timeout])
        raise UnicornError.new 'Failed to start new process'
      end
      Process.kill('QUIT', original_pid)
      while(is_running?(original_pid) && waited < @opts[:action_timeout])
        sleep_start = Time.now.to_f
        sleep(0.2)
        waited += Time.now.to_f - sleep_start
      end
      raise IsRunning.new 'Failed to stop original unicorn process' if is_running?(original_pid)
      raise NotRunning.new 'Failed to start new unicorn process'  unless is_running?
      reopen_logs
    end
  rescue NotRunning
    puts "WARN: #{@opts[:kind]} not currently running. Starting."
    start
  end
end

#start ⇒ Object

Start a new unicorn process



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# File 'lib/red_unicorn/unicorn.rb', line 34

def start
  process_is :stopped do
    %x{#{@opts[:exec_path]} #{format_options}}
  end
end

#status ⇒ Object

Return status of current process



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# File 'lib/red_unicorn/unicorn.rb', line 123

def status
  process_is :running do
    puts '* unicorn is running'
  end
end

#stop ⇒ Object

Stop current unicorn process



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# File 'lib/red_unicorn/unicorn.rb', line 41

def stop
  process_is :running do
    Process.kill('QUIT', pid)
  end
end