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Class: DRb::DRbMessage

Relationships & Source Files
Inherits: Object
Defined in: lib/drb/drb.rb

Overview

Handler for sending and receiving drb messages.

This takes care of the low-level marshalling and unmarshalling of drb requests and responses sent over the wire between server and client. This relieves the implementor of a new drb protocol layer with having to deal with these details.

The user does not have to directly deal with this object in normal use.

Class Method Summary

Instance Method Summary

Constructor Details

.new(config) ⇒ DRbMessage

This method is for internal use only.
[ GitHub ] 

  


# File 'lib/drb/drb.rb', line 557



def initialize(config) # :nodoc:
  @load_limit = config[:load_limit]
  @argc_limit = config[:argc_limit]
end


  







Instance Method Details



  

    #dump(obj, error = false)  
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'lib/drb/drb.rb', line 562



def dump(obj, error=false)  # :nodoc:
  case obj
  when DRbUndumped
    obj = make_proxy(obj, error)
  when Object
    # nothing
  else
    obj = make_proxy(obj, error)
  end
  begin
    str = Marshal::dump(obj)
  rescue
    str = Marshal::dump(make_proxy(obj, error))
  end
  [str.size].pack('N') + str
end


  








  

    #load(soc)  
  

  

    This method is for internal use only.
  



  

    
  





  
Raises:





  [ GitHub ]


  

  


# File 'lib/drb/drb.rb', line 579



def load(soc)  # :nodoc:
  begin
    sz = soc.read(4)        # sizeof (N)
  rescue
    raise(DRbConnError, $!.message, $!.backtrace)
  end
  raise(DRbConnError, 'connection closed') if sz.nil?
  raise(DRbConnError, 'premature header') if sz.size < 4
  sz = sz.unpack('N')[0]
  raise(DRbConnError, "too large packet #{sz}") if @load_limit < sz
  begin
    str = soc.read(sz)
  rescue
    raise(DRbConnError, $!.message, $!.backtrace)
  end
  raise(DRbConnError, 'connection closed') if str.nil?
  raise(DRbConnError, 'premature marshal format(can\'t read)') if str.size < sz
  DRb.mutex.synchronize do
    begin
      Marshal::load(str)
    rescue NameError, ArgumentError
      DRbUnknown.new($!, str)
    end
  end
end


  








  

    #make_proxy(obj, error = false)   (private)
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'lib/drb/drb.rb', line 646



def make_proxy(obj, error=false) # :nodoc:
  if error
    DRbRemoteError.new(obj)
  else
    DRbObject.new(obj)
  end
end


  








  

    #recv_reply(stream)  
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'lib/drb/drb.rb', line 639



def recv_reply(stream)  # :nodoc:
  succ = load(stream)
  result = load(stream)
  [succ, result]
end


  








  

    #recv_request(stream)  
  

  

    This method is for internal use only.
  



  

    
  





  
Raises:





  [ GitHub ]


  

  


# File 'lib/drb/drb.rb', line 619



def recv_request(stream) # :nodoc:
  ref = load(stream)
  ro = DRb.to_obj(ref)
  msg = load(stream)
  argc = load(stream)
  raise(DRbConnError, "too many arguments") if @argc_limit < argc
  argv = Array.new(argc, nil)
  argc.times do |n|
    argv[n] = load(stream)
  end
  block = load(stream)
  return ro, msg, argv, block
end


  








  

    #send_reply(stream, succ, result)  
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'lib/drb/drb.rb', line 633



def send_reply(stream, succ, result)  # :nodoc:
  stream.write(dump(succ) + dump(result, !succ))
rescue
  raise(DRbConnError, $!.message, $!.backtrace)
end


  








  

    #send_request(stream, ref, msg_id, arg, b)  
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'lib/drb/drb.rb', line 605



def send_request(stream, ref, msg_id, arg, b) # :nodoc:
  ary = []
  ary.push(dump(ref.__drbref))
  ary.push(dump(msg_id.id2name))
  ary.push(dump(arg.length))
  arg.each do |e|
    ary.push(dump(e))
  end
  ary.push(dump(b))
  stream.write(ary.join(''))
rescue
  raise(DRbConnError, $!.message, $!.backtrace)
end