Module: DRbRb

Defined in:
lib/drb-rb.rb,
lib/drb-rb/stable.rb

Defined Under Namespace

Modules: Stable

Class Method Summary collapse

Class Method Details

.drb_read_msg_piece(sock, include_raw: false) ⇒ Object 



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# File 'lib/drb-rb.rb', line 75

def self.drb_read_msg_piece(sock, include_raw: false)
  len = drb_read_msg_piece_length sock

  piece = nil
  begin
    Timeout::timeout(4) {
      piece = sock.recvfrom(len)[0]
      piece << sock.recvfrom(len - piece.size)[0] while piece.size < len
    }
  rescue Timeout::Error
    raise "recvfrom timed out"
  end

  obj = Parshal.unmarshal(piece)

  if include_raw
    [obj, piece]
  else
    obj
  end
end

.drb_read_msg_piece_length(sock) ⇒ Object 



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# File 'lib/drb-rb.rb', line 97

def self.drb_read_msg_piece_length(sock)
  len = 0
  begin
    Timeout::timeout(2) {
      len = sock.recvfrom(4)[0]
    }
  rescue Timeout::Error
    raise "recvfrom timed out"
  end

  if len.empty?
    raise 'recvfrom yielded no data'
  end

  while len.size < 4
    chunk = nil
    begin
      Timeout::timeout(2) {
        chunk = sock.recvfrom(4 - len.size)
      }
    rescue Timeout::Error
      raise "recvfrom timed out"
    end

    if chunk[0].empty?
      raise 'recvfrom yielded no data after partial read'
    end
    len << chunk[0]
  end

  len.unpack1('N')
end

.drb_read_reply(sock, include_raw: false) ⇒ Object 



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# File 'lib/drb-rb.rb', line 58

def self.drb_read_reply(sock, include_raw: false)
  [drb_read_msg_piece(sock), # success
   drb_read_msg_piece(sock, include_raw: include_raw)] # result
end

.drb_read_request(sock) ⇒ Object 



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# File 'lib/drb-rb.rb', line 44

def self.drb_read_request(sock)
  id = drb_read_msg_piece(sock, include_raw: true)
  method = drb_read_msg_piece(sock, include_raw: true)
  args_len = drb_read_msg_piece(sock, include_raw: true)
  args = []
  if args_len[0] != nil && args_len[0].instance_of?(Integer) && args_len[0] > 0
    for _ in 0...args_len[0]
      args.push(drb_read_msg_piece(sock, include_raw: true))
    end
  end
  block = drb_read_msg_piece(sock, include_raw: true)
  [id, method, args, block]
end

.drb_write_reply(sock, success, result, close = false) ⇒ Object 



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# File 'lib/drb-rb.rb', line 67

def self.drb_write_reply(sock, success, result, close=false)
  sock.send(make_reply(success, result), 0)
  if close
    sock.close
  end
  !close
end

.drb_write_request(sock, obj_id, method, args, block) ⇒ Object 



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# File 'lib/drb-rb.rb', line 63

def self.drb_write_request(sock, obj_id, method, args, block)
  sock.send(make_request(obj_id, method, args, block), 0)
end

.make_msg_piece(obj, prepend_size: true, raw: false) ⇒ Object 



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# File 'lib/drb-rb.rb', line 145

def self.make_msg_piece(obj, prepend_size: true, raw: false)
  #piece = Parshal.marshal(obj)
  piece = if raw
    obj
  else
    Marshal.dump(obj)
  end

  piece = [piece.size].pack('N') + piece if prepend_size
  piece
end

.make_reply(success, result, raw = [false,false]) ⇒ Object 



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# File 'lib/drb-rb.rb', line 139

def self.make_reply(success, result, raw=[false,false])
  reply = make_msg_piece(success, raw: raw[0])
  reply << make_msg_piece(result, raw: raw[1])
  reply
end

.make_request(obj_id, method, args, block) ⇒ Object 



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# File 'lib/drb-rb.rb', line 130

def self.make_request(obj_id, method, args, block)
  request = make_msg_piece(obj_id)
  request << make_msg_piece(method)
  request << make_msg_piece(args.size)
  args.each { |arg| request << make_msg_piece(arg) }
  request << make_msg_piece(block)
  request
end

.send_request(sock, obj_id, method, args, block, include_raw: false) ⇒ Object 



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# File 'lib/drb-rb.rb', line 39

def self.send_request(sock, obj_id, method, args, block, include_raw: false)
  drb_write_request(sock, obj_id, method, args, block)
  drb_read_reply(sock, include_raw: include_raw)
end

.start_server(sock, &block) ⇒ Object

block must accept 4 arguments: [obj_id, obj_id_raw], [method, method_raw], [args, args_raw], and [block, block_raw] block must return 2-3 arguments: success, result, close?



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# File 'lib/drb-rb.rb', line 10

def self.start_server(sock, &block)
  loop do
    req = begin
      drb_read_request(sock)
    rescue => e
      if 'recvfrom yielded no data' == e.message
        break
      end
      puts "Exception raised in DRbRb handler1: #{e.inspect}\n#{e.backtrace.join("\n")}"
      break
    end
    rep = begin
      block.call(*req)
    rescue => e
      puts "Exception raised in DRbRb handler: #{e.inspect}\n#{e.backtrace.join("\n")}"
      next
    end

    begin
      if not drb_write_reply(sock, *rep)
        break
      end
    rescue => e
      puts "Exception raised in DRbRb handler3: #{e.inspect}\n#{e.backtrace.join("\n")}"
      break
    end
  end
end