Class: Volt::MessageBus::PeerConnection

Inherits:
Object
  • Object
show all
Defined in:
lib/volt/server/message_bus/peer_to_peer/peer_connection.rb

Constant Summary collapse

CONNECT_TIMEOUT = 
2

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(socket, ip, port, message_bus, server = false) ⇒ PeerConnection 



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# File 'lib/volt/server/message_bus/peer_to_peer/peer_connection.rb', line 17

def initialize(socket, ip, port, message_bus, server=false)
  @message_bus = message_bus
  @ip = ip
  @port = port
  @server = server
  @socket = socket
  @server_id = message_bus.server_id
  @message_queue = SizedQueue.new(500)
  @reconnect_mutex = Mutex.new

  # The encoder handles things like formatting and encryption
  @message_encoder = MessageEncoder.new


  failed = false
  begin
    if server
      # Wait for announcement
      @peer_server_id = @message_encoder.receive_message(@socket)
      @message_encoder.send_message(@socket, @server_id)
    else
      # Announce
      @message_encoder.send_message(@socket, @server_id)
      @peer_server_id = @message_encoder.receive_message(@socket)
    end
  rescue IOError => e
    failed = true
  end

  # Make sure we aren't already connected
  @message_bus.remove_duplicate_connections

  # Don't connect to self
  if @failed || @peer_server_id == @server_id
    # Close the connection
    close
    return
  end

  @listen_thread = Thread.new do
    # Listen for messages in a new thread
    listen
  end

  @worker_thread = Thread.new do
    run_worker
  end
end

Instance Attribute Details

#peer_server_id ⇒ Object (readonly)

The server id for the connected server



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# File 'lib/volt/server/message_bus/peer_to_peer/peer_connection.rb', line 15

def peer_server_id
  @peer_server_id
end

#socket ⇒ Object (readonly)

The server id for the connected server



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# File 'lib/volt/server/message_bus/peer_to_peer/peer_connection.rb', line 15

def socket
  @socket
end

Class Method Details

.connect_to(message_bus, ips, port) ⇒ Object

Because servers can have many ips, we try the various ip’s until we are able to connect to one.



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# File 'lib/volt/server/message_bus/peer_to_peer/peer_connection.rb', line 136

def self.connect_to(message_bus, ips, port)
  ips.split(',').each do |ip|
    begin
      socket = SocketWithTimeout.new(ip, port, CONNECT_TIMEOUT)
      return PeerConnection.new(socket, ip, port, message_bus)
    rescue Errno::ECONNREFUSED, Errno::ETIMEDOUT => e
      # Unable to connect, next
      next
    end
  end

  return false
end

Instance Method Details

#disconnect ⇒ Object

Close the socket, kill worker threads, and remove from message_bus’s peer_connections



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# File 'lib/volt/server/message_bus/peer_to_peer/peer_connection.rb', line 68

def disconnect
  @disconnected = true
  @message_queue.push(:QUIT)
  begin
    @socket.close
  rescue => e
    # Ignore close error, since we may not be connected
  end

  @listen_thread.kill
  @worker_thread.kill

  @message_bus.remove_peer_connection(self)
end

#listen ⇒ Object 



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# File 'lib/volt/server/message_bus/peer_to_peer/peer_connection.rb', line 106

def listen
  loop do
    begin
      while (message = @message_encoder.receive_message(@socket))
        # puts "Message: #{message.inspect}"
        break if @disconnected
        @message_bus.handle_message(message)
      end

      # Got nil from socket
    rescue Errno::ECONNRESET, Errno::EPIPE, IOError => e
      # handle below
    end

    if !@disconnected && !@server
      # Connection was dropped, try to reconnect
      connected = reconnect!

      # Couldn't reconnect, die
      break unless connected
    else
      break
    end
  end
end

#publish(message) ⇒ Object 



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# File 'lib/volt/server/message_bus/peer_to_peer/peer_connection.rb', line 83

def publish(message)
  @message_queue.push(message)
end

#run_worker ⇒ Object 



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# File 'lib/volt/server/message_bus/peer_to_peer/peer_connection.rb', line 87

def run_worker
  while (message = @message_queue.pop)
    break if message == :QUIT

    begin
      @message_encoder.send_message(@socket, message)
      # 'Error: closed stream' comes in sometimes
    rescue Errno::ECONNREFUSED, Errno::EPIPE, IOError => e # was also rescuing Error
      if reconnect!
        retry
      else
        # Unable to reconnect, die
        break
      end
    end
  end
end