Class: CapistranoUnicorn::CapistranoIntegration

Inherits:
Object
  • Object
show all
Defined in:
lib/capistrano-unicorn/capistrano_integration.rb

Constant Summary collapse

TASKS = 
[
  'unicorn:start',
  'unicorn:stop',
  'unicorn:restart',
  'unicorn:reload', 
  'unicorn:shutdown',
  'unicorn:add_worker',
  'unicorn:remove_worker'
]

Class Method Summary collapse

Class Method Details

.load_into(capistrano_config) ⇒ Object 



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# File 'lib/capistrano-unicorn/capistrano_integration.rb', line 16

def self.load_into(capistrano_config)
  capistrano_config.load do
    before(CapistranoIntegration::TASKS) do
      _cset(:app_env)        { (fetch(:rails_env) rescue 'production') }
      _cset(:unicorn_pid)    { "#{fetch(:current_path)}/tmp/pids/unicorn.pid" }
      _cset(:unicorn_env)    { fetch(:app_env) }
      _cset(:unicorn_bin)    { "unicorn" }
      _cset(:unicorn_bundle) { fetch(:bundle_cmd) rescue 'bundle' }
    end

    # Check if a remote process exists using its pid file
    #
    def remote_process_exists?(pid_file)
      "[ -e #{pid_file} ] && kill -0 `cat #{pid_file}` > /dev/null 2>&1"
    end

    # Stale Unicorn process pid file
    #
    def old_unicorn_pid
      "#{unicorn_pid}.oldbin"
    end

    # Command to check if Unicorn is running
    #
    def unicorn_is_running?
      remote_process_exists?(unicorn_pid)
    end

    # Command to check if stale Unicorn is running
    #
    def old_unicorn_is_running?
      remote_process_exists?(old_unicorn_pid)
    end

    # Get unicorn master process PID (using the shell)
    #
    def get_unicorn_pid(pid_file=unicorn_pid)
      "`cat #{pid_file}`"
    end

    # Get unicorn master (old) process PID
    #
    def get_old_unicorn_pid
      get_unicorn_pid(old_unicorn_pid)
    end

    # Send a signal to a unicorn master processes
    #
    def unicorn_send_signal(signal, pid=get_unicorn_pid)
      "#{try_sudo} kill -s #{signal} #{pid}"
    end

    # Kill Unicorns in multiple ways O_O
    #
    def kill_unicorn(signal)
      script = "        if \#{unicorn_is_running?}; then\n          echo \"Stopping Unicorn...\";\n          \#{unicorn_send_signal(signal)};\n        else\n          echo \"Unicorn is not running.\";\n        fi;\n      END\n\n      script\n    end\n\n    # Start the Unicorn server\n    #\n    def start_unicorn\n      primary_config_path = \"\#{current_path}/config/unicorn.rb\"\n      secondary_config_path = \"\#{current_path}/config/unicorn/\#{unicorn_env}.rb\"\n\n      script = <<-END\n        if [ -e \#{primary_config_path} ]; then\n          UNICORN_CONFIG_PATH=\#{primary_config_path};\n        else\n          if [ -e \#{secondary_config_path} ]; then\n            UNICORN_CONFIG_PATH=\#{secondary_config_path};\n          else\n            echo \"Config file for \\\"\#{unicorn_env}\\\" environment was not found at either \\\"\#{primary_config_path}\\\" or \\\"\#{secondary_config_path}\\\"\";\n            exit 1;\n          fi;\n        fi;\n\n        if [ -e \#{unicorn_pid} ]; then\n          if kill -0 `cat \#{unicorn_pid}` > /dev/null 2>&1; then\n            echo \"Unicorn is already running!\";\n            exit 0;\n          fi;\n\n          rm \#{unicorn_pid};\n        fi;\n\n        echo \"Starting Unicorn...\";\n        cd \#{current_path} && BUNDLE_GEMFILE=\#{current_path}/Gemfile \#{unicorn_bundle} exec \#{unicorn_bin} -c $UNICORN_CONFIG_PATH -E \#{app_env} -D;\n      END\n\n      script\n    end\n\n    #\n    # Unicorn cap tasks\n    #\n    namespace :unicorn do\n      desc 'Start Unicorn master process'\n      task :start, :roles => :app, :except => {:no_release => true} do\n        run start_unicorn\n      end\n\n      desc 'Stop Unicorn'\n      task :stop, :roles => :app, :except => {:no_release => true} do\n        run kill_unicorn('QUIT')\n      end\n\n      desc 'Immediately shutdown Unicorn'\n      task :shutdown, :roles => :app, :except => {:no_release => true} do\n        run kill_unicorn('TERM')\n      end\n\n      desc 'Restart Unicorn'\n      task :restart, :roles => :app, :except => {:no_release => true} do\n        run <<-END\n          if \#{unicorn_is_running?}; then\n            echo \"Restarting Unicorn...\";\n            \#{unicorn_send_signal('USR2')};\n          else\n            \#{start_unicorn}\n          fi;\n\n          sleep 2; # in order to wait for the (old) pidfile to show up\n\n          if \#{old_unicorn_is_running?}; then\n            \#{unicorn_send_signal('QUIT', get_old_unicorn_pid)};\n          fi;\n        END\n      end\n\n      desc 'Reload Unicorn'\n      task :reload, :roles => :app, :except => {:no_release => true} do\n        run <<-END\n          if \#{unicorn_is_running?}; then\n            echo \"Reloading Unicorn...\";\n            \#{unicorn_send_signal('HUP')};\n          else\n            \#{start_unicorn}\n          fi;\n        END\n      end\n\n      desc 'Add a new worker'\n      task :add_worker, :roles => :app, :except => {:no_release => true} do\n        run <<-END\n          if \#{unicorn_is_running?}; then\n            echo \"Adding a new Unicorn worker...\";\n            \#{unicorn_send_signal('TTIN')};\n          else\n            echo \"Unicorn is not running.\";\n          fi;\n        END\n      end\n\n      desc 'Remove amount of workers'\n      task :remove_worker, :roles => :app, :except => {:no_release => true} do\n        run <<-END\n          if \#{unicorn_is_running?}; then\n            echo \"Removing a Unicorn worker...\";\n            \#{unicorn_send_signal('TTOU')};\n          else\n            echo \"Unicorn is not running.\";\n          fi;\n        END\n      end\n    end\n  end\nend\n"