Class: Riser::RootProcess

Inherits:
Object
  • Object
show all
Includes:
ServerSignal
Defined in:
lib/riser/daemon.rb

Constant Summary

Constants included from ServerSignal

ServerSignal::SIGNAL_RESTART_FORCED, ServerSignal::SIGNAL_RESTART_GRACEFUL, ServerSignal::SIGNAL_STAT_GET_AND_RESET, ServerSignal::SIGNAL_STAT_GET_NO_RESET, ServerSignal::SIGNAL_STAT_STOP, ServerSignal::SIGNAL_STOP_FORCED, ServerSignal::SIGNAL_STOP_GRACEFUL

Instance Method Summary collapse

Constructor Details

#initialize(logger, sockaddr_get, server_polling_interval_seconds, server_restart_overlap_seconds = 0, euid = nil, egid = nil, &block) ⇒ RootProcess

:yields: socket_server



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# File 'lib/riser/daemon.rb', line 201

def initialize(logger, sockaddr_get, server_polling_interval_seconds, server_restart_overlap_seconds=0, euid=nil, egid=nil, &block) # :yields: socket_server
  @logger = logger
  @sockaddr_get = sockaddr_get
  @server_polling_interval_seconds = server_polling_interval_seconds
  @server_restart_overlap_seconds = server_restart_overlap_seconds
  @euid = euid
  @egid = egid
  @server_setup = block
  @sysop = SystemOperation.new(@logger)
  @stop_state = nil
  @in_server_polling_sleep = false
  @signal_operation_queue = []
  @process_wait_count_table = {}
end

Instance Method Details

#signal_restart_forced ⇒ Object

should be called from signal(2) handler



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# File 'lib/riser/daemon.rb', line 257

def signal_restart_forced
  @signal_operation_queue << :restart_forced
  interrupt_server_polling_sleep
  nil
end

#signal_restart_graceful ⇒ Object

should be called from signal(2) handler



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# File 'lib/riser/daemon.rb', line 250

def signal_restart_graceful
  @signal_operation_queue << :restart_graceful
  interrupt_server_polling_sleep
  nil
end

#signal_server_down ⇒ Object

should be called from signal(2) handler



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# File 'lib/riser/daemon.rb', line 282

def signal_server_down
  interrupt_server_polling_sleep
  nil
end

#signal_stat_get(reset: true) ⇒ Object

should be called from signal(2) handler



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# File 'lib/riser/daemon.rb', line 264

def signal_stat_get(reset: true)
  if (reset) then
    @signal_operation_queue << :stat_get_and_reset
  else
    @signal_operation_queue << :stat_get_no_reset
  end
  interrupt_server_polling_sleep
  nil
end

#signal_stat_stop ⇒ Object

should be called from signal(2) handler



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# File 'lib/riser/daemon.rb', line 275

def signal_stat_stop
  @signal_operation_queue << :stat_stop
  interrupt_server_polling_sleep
  nil
end

#signal_stop_forced ⇒ Object

should be called from signal(2) handler



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# File 'lib/riser/daemon.rb', line 243

def signal_stop_forced
  @stop_state ||= :forced
  interrupt_server_polling_sleep
  nil
end

#signal_stop_graceful ⇒ Object

should be called from signal(2) handler



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# File 'lib/riser/daemon.rb', line 236

def signal_stop_graceful
  @stop_state ||= :graceful
  interrupt_server_polling_sleep
  nil
end

#start ⇒ Object

should be executed on the main thread sharing the stack with signal(2) handlers



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# File 'lib/riser/daemon.rb', line 430

def start
  @logger.info('daemon start.')

  unless (server_address = @sysop.get_server_address(@sockaddr_get)) then
    @logger.fatal('failed to start daemon.')
    return 1
  end

  unless (server_socket = @sysop.get_server_socket(server_address)) then
    @logger.fatal('failed to start daemon.')
    return 1
  end
  @logger.info("open server socket: #{@sysop.get_sockaddr(server_socket) || server_address}")

  begin
    server_socket_option(server_socket, server_address)

    unless (server_pid = run_server(server_socket)) then
      @logger.fatal('failed to start daemon.')
      return 1
    end
    @logger.info("server process start (pid: #{server_pid})")

    @logger.info("start server polling (interval seconds: #{@server_polling_interval_seconds})")
    until (@stop_state)
      server_polling_sleep
      if (server_pid) then
        @logger.debug("server polling... (pid: #{server_pid})") if @logger.debug?
      else
        @logger.debug('server polling...') if @logger.debug?
      end

      if (! server_pid || @sysop.wait(server_pid, Process::WNOHANG)) then
        if (server_pid) then
          @logger.warn("found server down (pid: #{server_pid}) and restart server.")
        else
          @logger.warn('found server down and restart server.')
        end
        if (server_pid = run_server(server_socket)) then
          @logger.info("server process start (pid: #{server_pid})")
        end
      end

      while (! @stop_state && server_pid && sig_ope = @signal_operation_queue.shift)
        case (sig_ope)
        when :restart_graceful, :restart_forced
          if (next_server_address = @sysop.get_server_address(@sockaddr_get)) then
            if (next_server_address.to_address == server_address.to_address) then
              if (next_server_address.to_option != server_address.to_option) then
                server_address = next_server_address
              end
            else
              if (next_server_socket = @sysop.get_server_socket(next_server_address)) then
                @logger.info("open server socket: #{@sysop.get_sockaddr(next_server_socket) || next_server_address}")
                server_socket_close(server_socket, server_address)
                server_socket = next_server_socket
                server_address = next_server_address
              else
                @logger.warn("server socket continue: #{@sysop.get_sockaddr(server_socket) || server_address}")
              end
            end
          else
            @logger.warn("server socket continue: #{@sysop.get_sockaddr(server_socket) || server_address}")
          end
          server_socket_option(server_socket, server_address)

          case (sig_ope)
          when :restart_graceful
            @logger.info("server graceful restart (pid: #{server_pid})")
          when :restart_forced
            @logger.info("server forced restart (pid: #{server_pid})")
          else
            @logger.warn("internal warning: unknown signal operation <#{sig_ope.inspect}>")
          end

          if (next_pid = run_server(server_socket)) then
            @logger.info("server process start (pid: #{next_pid})")

            if (@server_restart_overlap_seconds > 0) then
              @logger.info("server restart overlap (interval seconds: #{@server_restart_overlap_seconds})")
              sleep(@server_restart_overlap_seconds)
            end

            case (sig_ope)
            when :restart_graceful
              @logger.info("server graceful stop (pid: #{server_pid})")
              server_stop_graceful(server_pid)
            when :restart_forced
              @logger.info("server forced stop (pid: #{server_pid})")
              server_stop_forced(server_pid)
            else
              @logger.warn("internal warning: unknown signal operation <#{sig_ope.inspect}>")
            end

            @process_wait_count_table[server_pid] = 0
            server_pid = next_pid
          else
            @logger.warn("server continue (pid: #{server_pid})")
          end
        when :stat_get_and_reset
          if (@sysop.send_signal(server_pid, SIGNAL_STAT_GET_AND_RESET)) then
            @logger.info("stat get(reset: true) (pid: #{server_pid})")
          else
            @logger.error("failed to stat get(reset: true) (pid: #{server_pid})")
          end
        when :stat_get_no_reset
          if (@sysop.send_signal(server_pid, SIGNAL_STAT_GET_NO_RESET)) then
            @logger.info("stat get(reset: false) (pid: #{server_pid})")
          else
            @logger.error("failed to stat get(reset: false) (pid: #{server_pid})")
          end
        when :stat_stop
          if (@sysop.send_signal(server_pid, SIGNAL_STAT_STOP)) then
            @logger.info("stat stop (pid: #{server_pid})")
          else
            @logger.error("failed to stat stop (pid: #{server_pid})")
          end
        else
          @logger.warn("internal warning: unknown signal operation <#{sig_ope.inspect}>")
        end
      end

      for pid in @process_wait_count_table.keys
        if (@sysop.wait(pid, Process::WNOHANG)) then
          @logger.info("server stop completed (pid: #{pid})")
          @process_wait_count_table.delete(pid)
        else
          @process_wait_count_table[pid] += 1
          if (@process_wait_count_table[pid] >= 2) then
            @logger.warn("not stopped server process (pid: #{pid})")
          end
        end
      end
    end

    if (server_pid) then
      case (@stop_state)
      when :graceful
        @logger.info("server graceful stop (pid: #{server_pid})")
        unless (server_stop_graceful(server_pid)) then
          @logger.fatal('failed to stop daemon.')
          return 1
        end
        unless (@sysop.wait(server_pid)) then
          @logger.fatal('failed to stop daemon.')
          return 1
        end
      when :forced
        @logger.info("server forced stop (pid: #{server_pid})")
        unless (server_stop_forced(server_pid)) then
          @logger.fatal('failed to stop daemon.')
          return 1
        end
        unless (@sysop.wait(server_pid)) then
          @logger.fatal('failed to stop daemon.')
          return 1
        end
      else
        @logger.warn("internal warning: unknown stop state <#{@stop_state.inspect}>")
      end
    else
      @logger.warn('no server to stop.')
    end
  ensure
    server_socket_close(server_socket, server_address)
  end

  @logger.info('daemon stop.')
  return 0
end