Class: Riser::SocketProcessDispatcher

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

Constant Summary collapse

NO_CALL =

:nodoc:

proc{}
SEND_CMD =

:nodoc:

"SEND\n".freeze
SEND_LEN =

:nodoc:

SEND_CMD.bytesize
RADY_CMD =

:nodoc:

"RADY\n".freeze
RADY_LEN =

:nodoc:

RADY_CMD.bytesize

Constants included from ServerSignal

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(process_queue_name, thread_queue_name) ⇒ SocketProcessDispatcher

Returns a new instance of SocketProcessDispatcher.



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# File 'lib/riser/server.rb', line 440

def initialize(process_queue_name, thread_queue_name)
  @accept_polling_timeout_seconds = nil
  @process_num = nil
  @process_queue_name = process_queue_name
  @process_queue_size = nil
  @process_queue_polling_timeout_seconds = nil
  @process_send_io_polling_timeout_seconds = nil
  @thread_num = nil
  @thread_queue_name = thread_queue_name
  @thread_queue_size = nil
  @thread_queue_polling_timeout_seconds = nil
  @at_fork= nil
  @at_stop = nil
  @at_stat = nil
  @preprocess = nil
  @postprocess = nil
  @dispatch = nil
  @process_dispatcher = nil
end

Instance Attribute Details

#accept_polling_timeout_seconds ⇒ Object

Returns the value of attribute accept_polling_timeout_seconds.



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# File 'lib/riser/server.rb', line 460

def accept_polling_timeout_seconds
  @accept_polling_timeout_seconds
end

#process_num ⇒ Object

Returns the value of attribute process_num.



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# File 'lib/riser/server.rb', line 461

def process_num
  @process_num
end

#process_queue_polling_timeout_seconds ⇒ Object

Returns the value of attribute process_queue_polling_timeout_seconds.



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# File 'lib/riser/server.rb', line 463

def process_queue_polling_timeout_seconds
  @process_queue_polling_timeout_seconds
end

#process_queue_size ⇒ Object

Returns the value of attribute process_queue_size.



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# File 'lib/riser/server.rb', line 462

def process_queue_size
  @process_queue_size
end

#process_send_io_polling_timeout_seconds ⇒ Object

Returns the value of attribute process_send_io_polling_timeout_seconds.



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# File 'lib/riser/server.rb', line 464

def process_send_io_polling_timeout_seconds
  @process_send_io_polling_timeout_seconds
end

#thread_num ⇒ Object

Returns the value of attribute thread_num.



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# File 'lib/riser/server.rb', line 465

def thread_num
  @thread_num
end

#thread_queue_polling_timeout_seconds ⇒ Object

Returns the value of attribute thread_queue_polling_timeout_seconds.



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# File 'lib/riser/server.rb', line 467

def thread_queue_polling_timeout_seconds
  @thread_queue_polling_timeout_seconds
end

#thread_queue_size ⇒ Object

Returns the value of attribute thread_queue_size.



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# File 'lib/riser/server.rb', line 466

def thread_queue_size
  @thread_queue_size
end

Instance Method Details

#at_fork(&block) ⇒ Object

:yields:



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# File 'lib/riser/server.rb', line 469

def at_fork(&block)         # :yields:
  @at_fork = block
  nil
end

#at_stat(&block) ⇒ Object

:yields: stat_info



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# File 'lib/riser/server.rb', line 479

def at_stat(&block)         # :yields: stat_info
  @at_stat = block
  nil
end

#at_stop(&block) ⇒ Object

:yields: stop_state



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# File 'lib/riser/server.rb', line 474

def at_stop(&block)         # :yields: stop_state
  @at_stop = block
  nil
end

#dispatch(&block) ⇒ Object

:yields: accept_object



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# File 'lib/riser/server.rb', line 494

def dispatch(&block)        # :yields: accept_object
  @dispatch = block
  nil
end

#postprocess(&block) ⇒ Object

:yields:



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# File 'lib/riser/server.rb', line 489

def postprocess(&block)     # :yields:
  @postprocess = block
  nil
end

#preprocess(&block) ⇒ Object

:yields:



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# File 'lib/riser/server.rb', line 484

def preprocess(&block)      # :yields:
  @preprocess = block
  nil
end

#setup ⇒ Object

after this method call is completed, the object will be ready to accept ‘signal_…’ methods.



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# File 'lib/riser/server.rb', line 525

def setup
  @process_dispatcher = SocketThreadDispatcher.new(@process_queue_name)
  nil
end

#signal_stat_get(reset: true) ⇒ Object

should be called from signal(2) handler



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# File 'lib/riser/server.rb', line 512

def signal_stat_get(reset: true)
  @process_dispatcher.signal_stat_get(reset: reset) if @process_dispatcher
  nil
end

#signal_stat_stop ⇒ Object

should be called from signal(2) handler



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# File 'lib/riser/server.rb', line 518

def signal_stat_stop
  @process_dispatcher.signal_stat_stop if @process_dispatcher
  nil
end

#signal_stop_forced ⇒ Object

should be called from signal(2) handler



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# File 'lib/riser/server.rb', line 506

def signal_stop_forced
  @process_dispatcher.signal_stop_forced if @process_dispatcher
  nil
end

#signal_stop_graceful ⇒ Object

should be called from signal(2) handler



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# File 'lib/riser/server.rb', line 500

def signal_stop_graceful
  @process_dispatcher.signal_stop_graceful if @process_dispatcher
  nil
end

#start(server_socket) ⇒ Object 



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# File 'lib/riser/server.rb', line 535

def start(server_socket)
  case (server_socket)
  when TCPServer, UNIXServer
    socket_class = server_socket.class.superclass
  else
    socket_class = IO
  end

  parent_latch_file = Tempfile.open('riser_latch_')
  child_latch_file = File.open(parent_latch_file.path, File::RDWR)
  child_latch_file.flock(File::LOCK_EX | File::LOCK_NB) or raise "internal error: failed to lock latch file: #{parent_latch_file.path}"
  parent_latch_file.unlink

  process_list = []
  @process_num.times do |pos|
    child_io, parent_io = UNIXSocket.socketpair
    pid = Process.fork{
      server_socket.close
      parent_latch_file.close
      parent_io.close
      pos.times do |i|
        process_list[i].io.close
      end

      thread_dispatcher = SocketThreadDispatcher.new("#{@thread_queue_name}-#{pos}")
      thread_dispatcher.thread_num = @thread_num
      thread_dispatcher.thread_queue_size = @thread_queue_size
      thread_dispatcher.thread_queue_polling_timeout_seconds = @thread_queue_polling_timeout_seconds

      thread_dispatcher.at_stop(&@at_stop)
      thread_dispatcher.at_stat(&@at_stat)
      thread_dispatcher.at_stat_get(&NO_CALL)
      thread_dispatcher.at_stat_stop(&NO_CALL)
      thread_dispatcher.preprocess(&@preprocess)
      thread_dispatcher.postprocess(&@postprocess)

      thread_dispatcher.accept{
        if (child_io.wait_readable(@process_send_io_polling_timeout_seconds) != nil) then
          command = child_io.read(SEND_LEN)
          command == SEND_CMD or raise "internal error: unknown command <#{command.inspect}>"
          child_io.recv_io(socket_class)
        end
      }
      thread_dispatcher.accept_return{ child_io.write(RADY_CMD) }
      thread_dispatcher.dispatch(&@dispatch)
      thread_dispatcher.dispose(&NO_CALL)

      Signal.trap(SIGNAL_STOP_GRACEFUL) { thread_dispatcher.signal_stop_graceful }
      Signal.trap(SIGNAL_STOP_FORCED) { thread_dispatcher.signal_stop_forced }
      Signal.trap(SIGNAL_STAT_GET_AND_RESET) { thread_dispatcher.signal_stat_get(reset: true) }
      Signal.trap(SIGNAL_STAT_GET_NO_RESET) { thread_dispatcher.signal_stat_get(reset: false) }
      Signal.trap(SIGNAL_STAT_STOP) { thread_dispatcher.signal_stat_stop }

      # release flock(2)
      child_latch_file.close

      begin
        @at_fork.call
        thread_dispatcher.start
      ensure
        child_io.close
      end
    }
    child_io.close

    process_list << SocketProcess.new(pid, parent_io)
  end

  child_latch_file.close
  parent_latch_file.flock(File::LOCK_EX) # wait to release flock(2) at child processes
  parent_latch_file.close

  setup unless @process_dispatcher
  @process_dispatcher.thread_num = @process_num
  @process_dispatcher.thread_queue_size = @process_queue_size
  @process_dispatcher.thread_queue_polling_timeout_seconds = @process_queue_polling_timeout_seconds

  @process_dispatcher.at_stop{|state|
    case (state)
    when :graceful
      for process in process_list
        Process.kill(SIGNAL_STOP_GRACEFUL, process.pid)
      end
    when :forced
      for process in process_list
        Process.kill(SIGNAL_STOP_FORCED, process.pid)
      end
    end
  }
  @process_dispatcher.at_stat(&@at_stat)
  @process_dispatcher.at_stat_get{|reset|
    if (reset) then
      for process in process_list
        Process.kill(SIGNAL_STAT_GET_AND_RESET, process.pid)
      end
    else
      for process in process_list
        Process.kill(SIGNAL_STAT_GET_NO_RESET, process.pid)
      end
    end
  }
  @process_dispatcher.at_stat_stop{
    for process in process_list
      Process.kill(SIGNAL_STAT_STOP, process.pid)
    end
  }
  @process_dispatcher.preprocess(&NO_CALL)
  @process_dispatcher.postprocess(&NO_CALL)

  @process_dispatcher.accept{
    server_socket.accept_timeout(@accept_polling_timeout_seconds)
  }
  @process_dispatcher.accept_return(&NO_CALL)
  @process_dispatcher.dispatch{|socket|
    process = process_list[Thread.current[:number]]
    process.io.write(SEND_CMD)
    process.io.send_io(socket)
    response = process.io.read(RADY_LEN)
    response == RADY_CMD or raise "internal error: unknown response <#{response.inspect}>"
  }
  @process_dispatcher.dispose{
    process = process_list[Thread.current[:number]]
    Process.wait(process.pid)
    process.io.close
  }
  @process_dispatcher.start

  nil
end