graceful_shutdown

in lib/puma/server.rb [970:1020]

• 41 lines of code
• 11 McCabe index (conditional complexity)

    def graceful_shutdown
      if @options[:shutdown_debug]
        threads = Thread.list
        total = threads.size

        pid = Process.pid

        $stdout.syswrite "#{pid}: === Begin thread backtrace dump ===\n"

        threads.each_with_index do |t,i|
          $stdout.syswrite "#{pid}: Thread #{i+1}/#{total}: #{t.inspect}\n"
          $stdout.syswrite "#{pid}: #{t.backtrace.join("\n
        end
        $stdout.syswrite "#{pid}: === End thread backtrace dump ===\n"
      end

      if @options[:drain_on_shutdown]
        count = 0

        while true
          ios = IO.select @binder.ios, nil, nil, 0
          break unless ios

          ios.first.each do |sock|
            begin
              if io = sock.accept_nonblock
                count += 1
                client = Client.new io, @binder.env(sock)
                @thread_pool << client
              end
            rescue SystemCallError
            end
          end
        end

        @events.debug "Drained #{count} additional connections."
      end

      if @status != :restart
        @binder.close
      end

      if @thread_pool
        if timeout = @options[:force_shutdown_after]
          @thread_pool.shutdown timeout.to_i
        else
          @thread_pool.shutdown
        end
      end
    end