/// <summary>
/// .NET-specific decoding handler for incoming UDP messages.
/// </summary>
public override void Read(ChannelHandlerContext ctx, object msg)
{
var dgram = msg as DatagramPacket;
if (dgram == null)
{
ctx.FireRead(msg);
return;
}
var buf = dgram.Content;
var sender = dgram.Sender;
var recipient = dgram.Recipient;
try
{
var decoder = new Decoder(_signatureFactory);
bool finished = decoder.Decode(ctx, buf, recipient, sender);
if (finished)
{
// prepare finish
ctx.FireRead(decoder.PrepareFinish());
}
else
{
Logger.Warn("Did not get the complete packet!");
}
}
catch (Exception ex)
{
Logger.Error("Error in UDP decoding.", ex);
throw;
}
}
/// <summary>
/// Responds within a session. Keeps the connection open if told to do so.
/// Connection is only kept alive for TCP content.
/// </summary>
/// <param name="ctx">The channel context.</param>
/// <param name="responseMessage">The response message to send.</param>
internal void Respond(ChannelHandlerContext ctx, Message.Message responseMessage)
{
// TODO if/else can be tied together
if (ctx.Channel is IUdpChannel)
{
// Check, if channel is still open. If not, then do not send anything
// because this will cause an exception that will be logged.
var channel = ctx.Channel as IUdpChannel;
if (!channel.IsOpen)
{
Logger.Debug("Channel UDP is not open. Do not reply {0}.", responseMessage);
return;
}
Logger.Debug("Response UDP message {0}.", responseMessage);
}
else if (ctx.Channel is ITcpChannel)
{
// Check, if channel is still open. If not, then do not send anything
// because this will cause an exception that will be logged.
var channel = ctx.Channel as ITcpChannel;
if (!channel.IsOpen)
{
Logger.Debug("Channel TCP is not open. Do not reply {0}.", responseMessage);
return;
}
Logger.Debug("Response TCP message {0} to {1}.", responseMessage, "TODO"); // TODO find way to log TCP remoteEndpoint
}
ctx.FireRead(responseMessage);
}
private void Decoding(ChannelHandlerContext ctx, IPEndPoint sender, IPEndPoint receiver)
{
bool finished = true;
bool moreData = true;
while (finished && moreData)
{
finished = _decoder.Decode(ctx, _cumulation, receiver, sender);
if (finished)
{
_lastId = _decoder.Message.MessageId;
moreData = _cumulation.ReadableBytes > 0;
ctx.FireRead(_decoder.PrepareFinish());
}
else
{
if (_decoder.Message == null)
{
// Wait for more data. This may happen if we don't get the first
// 58 bytes, which is the size of the header.
return;
}
if (_lastId == _decoder.Message.MessageId)
{
// This ID was the same as the last and the last message already
// finished the parsing. So this message is finished as well, although
// it may send only partial content.
finished = true;
moreData = _cumulation.ReadableBytes > 0;
ctx.FireRead(_decoder.PrepareFinish());
}
else if (_decoder.Message.IsStreaming())
{
ctx.FireRead(_decoder.Message);
}
// arriving here, the next handler must not be called since another
// current architecture -> skip rest of handlers
// TCP packet needs to be cumulated
ctx.SkipRestRead();
}
}
}
public override void Read(ChannelHandlerContext ctx, object msg)
{
_lastReadTime.Set(Convenient.CurrentTimeMillis());
ctx.FireRead(msg);
}
public override void Read(ChannelHandlerContext ctx, object msg)
{
// server-side:
// message comes (over network) from sender
// -> correct DispatchHandler handles response
// Java uses a SimpleChannelInboundHandler that only expects Message objects
var requestMessage = msg as Message.Message;
if (requestMessage == null)
{
return;
}
Logger.Debug("Received request message {0} from channel {1}.", requestMessage, ctx.Channel);
if (requestMessage.Version != _p2PId)
{
Logger.Error("Wrong version. We are looking for {0}, but we got {1}. Received: {2}.", _p2PId, requestMessage.Version, requestMessage);
ctx.Close(); // TODO used?
lock (_peerBeanMaster.PeerStatusListeners)
{
foreach (IPeerStatusListener listener in _peerBeanMaster.PeerStatusListeners)
{
listener.PeerFailed(requestMessage.Sender,
new PeerException(PeerException.AbortCauseEnum.PeerError, "Wrong P2P version."));
}
}
return;
}
if (!requestMessage.IsRequest())
{
Logger.Debug("Handing request message to the next handler. {0}", requestMessage);
ctx.FireRead(msg);
return;
}
IResponder responder = new DirectResponder(this, _peerBeanMaster, ctx, requestMessage);
DispatchHandler myHandler = AssociatedHandler(requestMessage);
if (myHandler != null)
{
bool isUdp = ctx.Channel.IsUdp;
bool isRelay = requestMessage.Sender.IsRelayed;
if (!isRelay && requestMessage.PeerSocketAddresses.Count != 0)
{
PeerAddress sender =
requestMessage.Sender.ChangePeerSocketAddresses(requestMessage.PeerSocketAddresses);
requestMessage.SetSender(sender);
}
Logger.Debug("About to respond to request message {0}.", requestMessage);
// handle the request message
PeerConnection peerConnection = null;
if (!isUdp)
{
var tcpChannel = ctx.Channel as ITcpChannel;
peerConnection = new PeerConnection(requestMessage.Sender, tcpChannel, _heartBeatMillis);
}
myHandler.ForwardMessage(requestMessage, peerConnection, responder);
}
else
{
// do better error handling
// if a handler is not present at all, print a warning
if (_ioHandlers.Count == 0)
{
Logger.Debug("No handler found for request message {0}. This peer has probably been shut down.", requestMessage);
}
else
{
var knownCommands = KnownCommands();
if (knownCommands.Contains(Convert.ToInt32(requestMessage.Command)))
{
var sb = new StringBuilder();
foreach (int cmd in knownCommands)
{
sb.Append((Rpc.Rpc.Commands)cmd + "; ");
}
Logger.Warn("No handler found for request message {0}. Is the RPC command {1} registered? Found registered: {2}.", requestMessage, (Rpc.Rpc.Commands)requestMessage.Command, sb);
}
else
{
Logger.Debug("No handler found for request message {0}. This peer has probably been partially shut down.", requestMessage);
}
}
// return response that states that no handler was found
var responseMessage = DispatchHandler.CreateResponseMessage(requestMessage,
Message.Message.MessageType.UnknownId, _peerBeanMaster.ServerPeerAddress);
Respond(ctx, responseMessage);
}
}
public override void Read(ChannelHandlerContext ctx, object msg)
{
// client-side:
// Here, the result for the awaitable task can be set.
// If it is not a fire-and-forget message, the "result" of the TCS
// must be set here. (If FF, then it is set in Sender.)
// Java uses a SimpleChannelInboundHandler that only expects Message objects
var responseMessage = msg as Message.Message;
if (responseMessage == null)
{
return;
}
var recvMessageId = new MessageId(responseMessage);
// error handling
if (responseMessage.Type == Message.Message.MessageType.UnknownId)
{
string msg2 =
"Message was not delivered successfully. Unknown ID (peer may be offline or unknown RPC handler): " +
_message;
ExceptionCaught(ctx, new PeerException(PeerException.AbortCauseEnum.PeerAbort, msg2));
return;
}
if (responseMessage.Type == Message.Message.MessageType.Exception)
{
string msg2 = "Message caused an exception on the other side. Handle as PeerAbort: " + _message;
ExceptionCaught(ctx, new PeerException(PeerException.AbortCauseEnum.PeerAbort, msg2));
return;
}
if (responseMessage.IsRequest())
{
ctx.FireRead(responseMessage);
return;
}
if (!_sendMessageId.Equals(recvMessageId))
{
string msg2 =
String.Format(
"Response message [{0}] sent to the node is not the same as we expect. We sent request message [{1}].",
responseMessage, _message);
ExceptionCaught(ctx, new PeerException(PeerException.AbortCauseEnum.PeerAbort, msg2));
return;
}
// We need to exclude RCON messages from the sanity check because we
// use this RequestHandler for sending a Type.REQUEST_1,
// RPC.Commands.RCON message on top of it. Therefore the response
// type will never be the same Type as the one the user initially
// used (e.g. DIRECT_DATA).
if (responseMessage.Command != Rpc.Rpc.Commands.Rcon.GetNr() &&
_message.Recipient.IsRelayed != responseMessage.Sender.IsRelayed)
{
string msg2 =
String.Format(
"Response message [{0}] sent has a different relay flag than we sent with request message [{1}]. Recipient ({2}) / Sender ({3}).",
responseMessage, _message, _message.Recipient.IsRelayed, responseMessage.Sender.IsRelayed);
ExceptionCaught(ctx, new PeerException(PeerException.AbortCauseEnum.PeerAbort, msg2));
return;
}
// we got a good answer, let's mark the sender as alive
if (responseMessage.IsOk() || responseMessage.IsNotOk())
{
lock (PeerBean.PeerStatusListeners)
{
if (responseMessage.Sender.IsRelayed && responseMessage.PeerSocketAddresses.Count != 0)
{
// use the response message as we have up-to-date content for the relays
PeerAddress remotePeer =
responseMessage.Sender.ChangePeerSocketAddresses(responseMessage.PeerSocketAddresses);
responseMessage.SetSender(remotePeer);
}
foreach (IPeerStatusListener listener in PeerBean.PeerStatusListeners)
{
listener.PeerFound(responseMessage.Sender, null, null);
}
}
}
// call this for streaming support
if (!responseMessage.IsDone)
{
Logger.Debug("Good message is streaming. {0}", responseMessage);
return;
}
if (!_message.IsKeepAlive())
{
Logger.Debug("Good message {0}. Close channel {1}.", responseMessage, ctx.Channel);
// .NET-specific:
// set the result now, but trigger the notify when the channel is closed
_tcsResponse.ResponseLater(responseMessage, ctx);
// in Java, the channel creator adds a listener that sets the
// future response result when the channel is closed
ctx.Close(); // TODO needed?
}
else
{
Logger.Debug("Good message {0}. Leave channel {1} open.", responseMessage, ctx.Channel);
_tcsResponse.SetResult(responseMessage);
}
}
