/// <summary>
/// Decodes a message object.
/// The format looks as follows: 28 bit P2P version, 4 bit message type, 32 bit message ID, 8 bit message command,
/// 160 bit senderSocket ID, 16 bit senderSocket TCP port, 16 bit senderSocket UDP port, 160 bit recipientSocket ID, 32 bit content types, 8 bit options.
/// In total, the header is of size 58 bytes.
/// </summary>
/// <param name="buffer">The buffer to decode from.</param>
/// <param name="recipientSocket">The recipientSocket of the message.</param>
/// <param name="senderSocket">The senderSocket of the packet, which has been set in the socket class.</param> // TODO check if true
/// <returns>The partial message where only the header fields are set.</returns>
public static Message DecodeHeader(AlternativeCompositeByteBuf buffer, IPEndPoint recipientSocket, IPEndPoint senderSocket)
{
Logger.Debug("Decode message. Recipient: {0}, Sender: {1}", recipientSocket, senderSocket);
var message = new Message();
int versionAndType = buffer.ReadInt(); // 4
message.SetVersion(versionAndType >> 4);
message.SetType((Message.MessageType)(versionAndType & Utils.Utils.Mask0F)); // TODO does this work? (2x)
message.SetMessageId(buffer.ReadInt()); // 8
message.SetCommand(buffer.ReadByte()); // 9 // TODO check conversion with Java version
var senderId = ReadId(buffer); // 29
int tcpPort = buffer.ReadUShort(); // 31 // TODO check if should be read as short (same as encode)
int udpPort = buffer.ReadUShort(); // 33
var recipientId = ReadId(buffer); // 53
int contentTypes = buffer.ReadInt(); // 57
int options = buffer.ReadUByte(); // 58 // TODO check if should be read as unsigned/signed
message.SetRecipient(new PeerAddress(recipientId, recipientSocket));
message.HasContent(contentTypes != 0);
message.SetContentType(DecodeContentTypes(contentTypes, message));
message.SetOptions(options & Utils.Utils.Mask0F);
// set the address as we see it, important for port forwarding identification
int senderOptions = options >> 4;
var pa = new PeerAddress(senderId, senderSocket.Address, tcpPort, udpPort, senderOptions);
message.SetSender(pa);
message.SetSenderSocket(senderSocket);
message.SetRecipientSocket(recipientSocket);
return message;
}
/// <summary>
/// Encodes a message object.
/// The format looks as follows: 28 bit P2P version, 4 bit message type, 32 bit message ID, 8 bit message command,
/// 160 bit senderSocket ID, 16 bit senderSocket TCP port, 16 bit senderSocket UDP port, 160 bit recipientSocket ID, 32 bit content types, 8 bit options.
/// In total, the header is of size 58 bytes.
/// </summary>
/// <param name="buffer">The buffer to encode to.</param>
/// <param name="message">The message with the header that will be encoded.</param>
public static void EncodeHeader(AlternativeCompositeByteBuf buffer, Message message)
{
// TODO add log statemet, also in Java version
int versionAndType = message.Version << 4 | ((int)message.Type & Utils.Utils.Mask0F); // TODO check if ordinal works
buffer.WriteInt(versionAndType); // 4
buffer.WriteInt(message.MessageId); // 8
buffer.WriteByte(message.Command); // 9
buffer.WriteBytes(message.Sender.PeerId.ToByteArray()); // 29
buffer.WriteShort((short) message.Sender.TcpPort); // 31
buffer.WriteShort((short) message.Sender.UdpPort); // 33
buffer.WriteBytes(message.Recipient.PeerId.ToByteArray()); // 53
buffer.WriteInt(EncodeContentTypes(message.ContentTypes)); // 57
buffer.WriteByte((sbyte) (message.Sender.Options << 4 | message.Options)); // 58 // TODO check if works
}
public static Message CreateDummyMessage(Number160 idSender, String inetSender, int tcpPortSendor,
int udpPortSender, Number160 idRecipient, String inetRecipient, int tcpPortRecipient,
int udpPortRecipient, sbyte command, Message.MessageType type, bool firewallUdp, bool firewallTcp)
{
var message = new Message();
PeerAddress n1 = CreateAddress(idSender, inetSender, tcpPortSendor, udpPortSender, firewallUdp, firewallTcp);
message.SetSender(n1);
//
PeerAddress n2 = CreateAddress(idRecipient, inetRecipient, tcpPortRecipient, udpPortRecipient, firewallUdp, firewallTcp);
message.SetRecipient(n2);
message.SetType(type);
message.SetCommand(command);
return message;
}
public override void HandleResponse(Message.Message requestMessage, PeerConnection peerConnection, bool sign, IResponder responder)
{
if (!(requestMessage.Type == Message.Message.MessageType.RequestFf1
&& requestMessage.Command == Rpc.Commands.Broadcast.GetNr()))
{
throw new ArgumentException("Message content is wrong for this handler.");
}
Logger.Debug("Received BROADCAST message: {0}.", requestMessage);
BroadcastHandler.Receive(requestMessage);
if (requestMessage.IsUdp)
{
responder.ResponseFireAndForget();
}
else
{
responder.Response(CreateResponseMessage(requestMessage, Message.Message.MessageType.Ok));
}
}
/// <summary>
/// .NET-specific: Used for DistributedRouting only.
/// </summary>
internal TaskCompletionSource<Message.Message> CloseNeighborsTcs(PeerAddress remotePeer, SearchValues searchValues, Message.Message.MessageType type,
ChannelCreator channelCreator, IConnectionConfiguration configuration)
{
var message = CreateRequestMessage(remotePeer, Rpc.Commands.Neighbor.GetNr(), type);
if (!message.IsRequest())
{
throw new ArgumentException("The type must be a request.");
}
message.SetKey(searchValues.LocationKey);
message.SetKey(searchValues.DomainKey ?? Number160.Zero);
if (searchValues.From != null && searchValues.To != null)
{
ICollection<Number640> collection = new List<Number640>();
collection.Add(searchValues.From);
collection.Add(searchValues.To);
var keyCollection = new KeyCollection(collection);
message.SetKeyCollection(keyCollection);
}
else
{
if (searchValues.ContentKey != null)
{
message.SetKey(searchValues.ContentKey);
}
if (searchValues.KeyBloomFilter != null)
{
message.SetBloomFilter(searchValues.KeyBloomFilter);
}
if (searchValues.ContentBloomFilter != null)
{
message.SetBloomFilter(searchValues.ContentBloomFilter);
}
}
return Send(message, configuration, channelCreator);
}
private void RemovePeerIfFailed(TaskCompletionSource<Message.Message> tcs, Message.Message message)
{
// execute the following delegate only if TCS task failed
tcs.Task.ContinueWith(delegate(Task task)
{
if (message.Recipient.IsRelayed)
{
// TODO: Java, make the relay go away if failed
}
else
{
lock (_peerStatusListeners)
{
foreach (var listener in _peerStatusListeners)
{
listener.PeerFailed(message.Recipient, new PeerException(tcs));
}
}
}
}, TaskContinuationOptions.OnlyOnFaulted);
}
private async Task AfterConnectAsync(TaskCompletionSource<Message.Message> tcsResponse, Message.Message message,
IClientChannel channel, bool isFireAndForget)
{
// TODO use for UDP connections, too
// TODO find clean-mechanism to show the channel-creation fails (UDP uses try/catch)
// check if channel could be created (due to shutdown)
if (channel == null)
{
string msg = String.Format("Could not create a {0} socket. (Due to shutdown.)", message.IsUdp ? "UDP" : "TCP");
Logger.Warn(msg);
tcsResponse.SetException(new TaskFailedException(msg));
return;
}
Logger.Debug("About to connect to {0} with channel {1}, ff = {2}.", message.Recipient, channel, isFireAndForget);
// sending
var sendTask = channel.SendMessageAsync(message);
await AfterSendAsync(sendTask, tcsResponse, isFireAndForget, channel);
}
private async Task ConnectAndSendAsync(IInboundHandler handler, TaskCompletionSource<Message.Message> tcsResponse, ChannelCreator channelCreator, int connectTimeoutMillis, PeerConnection peerConnection, TimeoutFactory timeoutHandler, Message.Message message)
{
var recipient = message.Recipient.CreateSocketTcp();
var channel = SendTcpCreateChannel(recipient, channelCreator, peerConnection, handler, timeoutHandler,
connectTimeoutMillis);
await AfterConnectAsync(tcsResponse, message, channel, handler == null);
}
/// <summary>
/// // TODO document
/// </summary>
/// <param name="handler"></param>
/// <param name="tcsResponse"></param>
/// <param name="message"></param>
/// <param name="channelCreator"></param>
/// <param name="idleTcpSeconds"></param>
/// <param name="connectTimeoutMillis"></param>
/// <param name="peerConnection"></param>
/// <param name="timeoutHandler"></param>
private async Task HandleRelayAsync(IInboundHandler handler, TaskCompletionSource<Message.Message> tcsResponse,
Message.Message message, ChannelCreator channelCreator, int idleTcpSeconds, int connectTimeoutMillis,
PeerConnection peerConnection, TimeoutFactory timeoutHandler)
{
var taskPingDone = PingFirst(message.Recipient.PeerSocketAddresses);
await taskPingDone;
if (!taskPingDone.IsFaulted)
{
var recipient = PeerSocketAddress.CreateSocketTcp(taskPingDone.Result);
var channel = SendTcpCreateChannel(recipient, channelCreator, peerConnection, handler,
timeoutHandler, connectTimeoutMillis);
await AfterConnectAsync(tcsResponse, message, channel, handler == null);
// TODO add this before AfterConnect?
var taskResponse = tcsResponse.Task;
await taskResponse;
if (taskResponse.IsFaulted)
{
if (taskResponse.Result != null &&
taskResponse.Result.Type != Message.Message.MessageType.User1)
{
// "clearInactivePeerSocketAddress"
var tmp = new List<PeerSocketAddress>();
foreach (var psa in message.Recipient.PeerSocketAddresses)
{
if (psa != null)
{
if (!psa.Equals(taskPingDone.Result))
{
tmp.Add(psa);
}
}
}
message.SetPeerSocketAddresses(tmp);
await SendTcpAsync(handler, tcsResponse, message, channelCreator, idleTcpSeconds,
connectTimeoutMillis, peerConnection);
}
}
}
else
{
// .NET-specific:
tcsResponse.SetException(new TaskFailedException("No relay could be contacted. <-> " + taskPingDone.Exception));
}
}
/// <summary>
/// This method makes a copy of the original message and prepares it for
/// sending it to the relay.
/// </summary>
/// <param name="message"></param>
/// <returns></returns>
private static Message.Message CreateRconMessage(Message.Message message)
{
// get relay address from the unreachable peer
var relayAddresses = message.Recipient.PeerSocketAddresses.ToArray();
PeerSocketAddress socketAddress;
if (relayAddresses.Length > 0)
{
// we should be fair and choose one of the relays randomly
socketAddress = relayAddresses[Utils.Utils.RandomPositiveInt(relayAddresses.Length)];
}
else
{
throw new ArgumentException("There are no PeerSocketAddresses available for this relayed peer. This should not be possible!");
}
// we need to make a copy of the original message
var rconMessage = new Message.Message();
rconMessage.SetSender(message.Sender);
rconMessage.SetVersion(message.Version);
rconMessage.SetIntValue(message.MessageId);
// make the message ready to send
PeerAddress recipient =
message.Recipient
.ChangeAddress(socketAddress.InetAddress)
.ChangePorts(socketAddress.TcpPort, socketAddress.UdpPort)
.ChangeIsRelayed(false);
rconMessage.SetRecipient(recipient);
rconMessage.SetCommand(Rpc.Rpc.Commands.Rcon.GetNr());
rconMessage.SetType(Message.Message.MessageType.Request1);
return rconMessage;
}
/// <summary>
/// This method initiates the reverse connection setup.
/// It creates a new message and sends it via relay to the unreachable peer
/// which then connects to this peer again. After the connect message from the
/// unreachable peer, this peer will send the original message and its content
/// directly.
/// </summary>
/// <param name="handler"></param>
/// <param name="tcsResponse"></param>
/// <param name="message"></param>
/// <param name="channelCreator"></param>
/// <param name="connectTimeoutMillis"></param>
/// <param name="peerConnection"></param>
/// <param name="timeoutHandler"></param>
private async Task HandleRconAsync(IInboundHandler handler, TaskCompletionSource<Message.Message> tcsResponse,
Message.Message message, ChannelCreator channelCreator, int connectTimeoutMillis,
PeerConnection peerConnection, TimeoutFactory timeoutHandler)
{
message.SetKeepAlive(true);
Logger.Debug("Initiate reverse connection setup to peer with address {0}.", message.Recipient);
var rconMessage = CreateRconMessage(message);
// TODO works?
// cache the original message until the connection is established
_cachedRequests.AddOrUpdate(message.MessageId, tcsResponse, (i, source) => tcsResponse);
// wait for response (whether the reverse connection setup was successful)
var tcsRconResponse = new TaskCompletionSource<Message.Message>(rconMessage);
// .NET-specific: specify and use a RconInboundHandler class
var rconInboundHandler = new RconInboundHandler(tcsRconResponse, tcsResponse);
// send reverse connection request instead of normal message
await SendTcpAsync(rconInboundHandler, tcsRconResponse, rconMessage, channelCreator, connectTimeoutMillis,
connectTimeoutMillis, peerConnection);
}
/// <summary>
/// Requests close neighbors from the remote peer. The remote peer may indicate if the
/// data is present on that peer. This is an RPC.
/// </summary>
/// <param name="remotePeer">The remote peer to send this request to.</param>
/// <param name="searchValues">The values to search for in the storage.</param>
/// <param name="type">The type of the neighbor request:
/// - Request1 for Neighbors means check for Put (no digest) for tracker and storage.
/// - Request2 for Neighbors means check for Get (with digest) for storage.
/// - Request3 for Neighbors means check for Get (with digest) for tracker.
/// - Request4 for Neighbors means check for Put (with digest) for task.</param>
/// <param name="channelCreator">The channel creator that creates connections.</param>
/// <param name="configuration">The client-side connection configuration.</param>
/// <returns>The future response message.</returns>
public Task<Message.Message> CloseNeighborsAsync(PeerAddress remotePeer, SearchValues searchValues, Message.Message.MessageType type,
ChannelCreator channelCreator, IConnectionConfiguration configuration)
{
var tcsResponse = CloseNeighborsTcs(remotePeer, searchValues, type, channelCreator, configuration);
return tcsResponse.Task;
}
public override void HandleResponse(Message.Message requestMessage, PeerConnection peerConnection, bool sign, IResponder responder)
{
if (requestMessage.KeyList.Count < 2)
{
throw new ArgumentException("At least location and domain keys are needed.");
}
if (!(requestMessage.Type == Message.Message.MessageType.Request1
|| requestMessage.Type == Message.Message.MessageType.Request2
|| requestMessage.Type == Message.Message.MessageType.Request3
|| requestMessage.Type == Message.Message.MessageType.Request4)
&& (requestMessage.Command == Rpc.Commands.Neighbor.GetNr()))
{
throw new ArgumentException("Message content is wrong for this handler.");
}
Number160 locationKey = requestMessage.Key(0);
Number160 domainKey = requestMessage.Key(1);
var neighbors = GetNeighbors(locationKey, NeighborSize);
if (neighbors == null)
{
// return empty neighbor set
var response = CreateResponseMessage(requestMessage, Message.Message.MessageType.NotFound);
response.SetNeighborSet(new NeighborSet(-1, new Collection<PeerAddress>()));
responder.Response(response);
return;
}
// create response message and set neighbors
var responseMessage = CreateResponseMessage(requestMessage, Message.Message.MessageType.Ok);
Logger.Debug("Found the following neighbors: {0}.", Convenient.ToString(neighbors));
var neighborSet = new NeighborSet(NeighborLimit, neighbors);
responseMessage.SetNeighborSet(neighborSet);
Number160 contentKey = requestMessage.Key(2);
var keyBloomFilter = requestMessage.BloomFilter(0);
var contentBloomFilter = requestMessage.BloomFilter(1);
var keyCollection = requestMessage.KeyCollection(0);
// it is important to set an integer if a value is present
bool isDigest = requestMessage.Type != Message.Message.MessageType.Request1;
if (isDigest)
{
if (requestMessage.Type == Message.Message.MessageType.Request2)
{
DigestInfo digestInfo;
if (PeerBean.DigestStorage == null)
{
// no storage to search
digestInfo = new DigestInfo();
}
else if (contentKey != null && locationKey != null && domainKey != null)
{
var locationAndDomainKey = new Number320(locationKey, domainKey);
var from = new Number640(locationAndDomainKey, contentKey, Number160.Zero);
var to = new Number640(locationAndDomainKey, contentKey, Number160.MaxValue);
digestInfo = PeerBean.DigestStorage.Digest(from, to, -1, true);
}
else if ((keyBloomFilter != null || contentBloomFilter != null) && locationKey != null && domainKey != null)
{
var locationAndDomainKey = new Number320(locationKey, domainKey);
digestInfo = PeerBean.DigestStorage.Digest(locationAndDomainKey, keyBloomFilter,
contentBloomFilter, -1, true, true);
}
else if (keyCollection != null && keyCollection.Keys.Count == 2)
{
var enumerator = keyCollection.Keys.GetEnumerator();
var from = enumerator.MoveNext() ? enumerator.Current : null; // TODO works correctly?
var to = enumerator.MoveNext() ? enumerator.Current : null;
digestInfo = PeerBean.DigestStorage.Digest(from, to, -1, true);
}
else if (locationKey != null && domainKey != null)
{
var locationAndDomainKey = new Number320(locationKey, domainKey);
var from = new Number640(locationAndDomainKey, Number160.Zero, Number160.Zero);
var to = new Number640(locationAndDomainKey, Number160.MaxValue, Number160.MaxValue);
digestInfo = PeerBean.DigestStorage.Digest(from, to, -1, true);
}
else
{
Logger.Warn("Did not search for anything.");
digestInfo = new DigestInfo();
}
responseMessage.SetIntValue(digestInfo.Size);
responseMessage.SetKey(digestInfo.KeyDigest);
responseMessage.SetKey(digestInfo.ContentDigest);
}
else if (requestMessage.Type == Message.Message.MessageType.Request3)
{
DigestInfo digestInfo;
if (PeerBean.DigestTracker == null)
{
// no tracker to search
digestInfo = new DigestInfo();
}
else
{
digestInfo = PeerBean.DigestTracker.Digest(locationKey, domainKey, contentKey);
if (digestInfo.Size == 0)
{
Logger.Debug("No entry found on peer {0}.", requestMessage.Recipient);
}
}
responseMessage.SetIntValue(digestInfo.Size);
}
else if (requestMessage.Type == Message.Message.MessageType.Request4)
{
lock (PeerBean.PeerStatusListeners)
{
foreach (var listener in PeerBean.PeerStatusListeners)
{
listener.PeerFailed(requestMessage.Sender,
new PeerException(PeerException.AbortCauseEnum.Shutdown, "shutdown"));
}
}
}
}
responder.Response(responseMessage);
}
private TaskCompletionSource<Message.Message> Send(Message.Message message, IConnectionConfiguration configuration,
ChannelCreator channelCreator)
{
var tcsResponse = new TaskCompletionSource<Message.Message>(message);
tcsResponse.Task.ContinueWith(taskResponse =>
{
if (!taskResponse.IsFaulted)
{
var response = taskResponse.Result;
if (response != null)
{
var neighborSet = response.NeighborsSet(0);
if (neighborSet != null)
{
foreach (var neighbor in neighborSet.Neighbors)
{
lock (PeerBean.PeerStatusListeners)
{
foreach (var listener in PeerBean.PeerStatusListeners)
{
listener.PeerFound(neighbor, response.Sender, null);
}
}
}
}
}
}
});
var requestHandler = new RequestHandler(tcsResponse, PeerBean, ConnectionBean, configuration);
if (!configuration.IsForceTcp)
{
requestHandler.SendUdpAsync(channelCreator);
}
else
{
requestHandler.SendTcpAsync(channelCreator);
}
// .NET-specific: Return TCS instead of Task. It's actually the same TCS that is provided with
// the RequestHandler c'tor
return tcsResponse;
}
/// <summary>
/// Encodes the 8 content types to an integer (32 bit).
/// </summary>
/// <param name="contentTypes">The 8 content types to be encoded.</param>
/// <returns>The encoded 32 bit integer.</returns>
public static int EncodeContentTypes(Message.Content[] contentTypes)
{
int result = 0;
for (int i = 0; i < Message.ContentTypeLength/2; i++)
{
if (contentTypes[i*2] != Message.Content.Empty) // TODO check port
{
result |= ((int) contentTypes[i*2] << (i*8)); // TODO check ordinal
}
if (contentTypes[i*2 + 1] != Message.Content.Empty)
{
result |= ((int) contentTypes[i*2 + 1] << 4) << (i*8);
}
}
return result;
}
/// <summary>
/// Sends a message via UDP.
/// </summary>
/// <param name="handler">The handler to deal with the response message.</param>
/// <param name="tcsResponse">The TCS for the response message. (FutureResponse equivalent.)</param>
/// <param name="message">The message to send.</param>
/// <param name="channelCreator">The channel creator for the UDP channel.</param>
/// <param name="idleUdpSeconds">The idle time of a message until fail.</param>
/// <param name="broadcast">True, if the message is to be sent via layer 2 broadcast.</param>
/// <returns>The response message or null, if it is fire-and-forget or a failure occurred.</returns>
public async Task SendUdpAsync(IInboundHandler handler, TaskCompletionSource<Message.Message> tcsResponse, Message.Message message, ChannelCreator channelCreator, int idleUdpSeconds, bool broadcast)
{
// no need to continue if already finished
if (tcsResponse.Task.IsCompleted)
{
return;
}
RemovePeerIfFailed(tcsResponse, message);
bool isFireAndForget = handler == null;
// relay options
if (message.Sender.IsRelayed)
{
message.SetPeerSocketAddresses(message.Sender.PeerSocketAddresses);
IList<PeerSocketAddress> relayAddresses = new List<PeerSocketAddress>(message.Recipient.PeerSocketAddresses);
Logger.Debug("Send neighbor request to random relay peer {0}.", relayAddresses);
if (relayAddresses.Count > 0)
{
var relayAddress = relayAddresses[_random.NextInt(relayAddresses.Count)];
message.SetRecipientRelay(message.Recipient
.ChangePeerSocketAddress(relayAddress)
.ChangeIsRelayed(true));
}
else
{
const string msg = "Peer is relayed, but no relay is given.";
Logger.Error(msg);
tcsResponse.SetException(new TaskFailedException(msg));
return;
}
}
// check for invalid UDP connection to unreachable peers
if (message.Recipient.IsRelayed && message.Command != Rpc.Rpc.Commands.Neighbor.GetNr()
&& message.Command != Rpc.Rpc.Commands.Ping.GetNr())
{
string msg =
String.Format(
"Tried to send a UDP message to unreachable peers. Only TCP messages can be sent to unreachable peers: {0}.",
message);
Logger.Warn(msg);
tcsResponse.SetException(new TaskFailedException(msg));
return;
}
// pipeline handler setup
TimeoutFactory timeoutFactory = CreateTimeoutHandler(tcsResponse, idleUdpSeconds, isFireAndForget);
var handlers = new Dictionary<string, IChannelHandler>();
if (!isFireAndForget)
{
handlers.Add("timeout0", timeoutFactory.CreateIdleStateHandlerTomP2P());
handlers.Add("timeout1", timeoutFactory.CreateTimeHandler());
}
handlers.Add("decoder", new TomP2PSinglePacketUdp(ChannelClientConfiguration.SignatureFactory));
handlers.Add("encoder", new TomP2POutbound(false, ChannelClientConfiguration.SignatureFactory));
if (!isFireAndForget)
{
handlers.Add("handler", handler);
}
// create UDP channel
MyUdpClient udpClient = null;
try
{
udpClient = channelCreator.CreateUdp(broadcast, handlers);
}
catch (Exception ex)
{
string msg = "Channel creation failed. " + ex;
Logger.Debug(msg);
tcsResponse.SetException(ex);
// may have been closed by the other side
// or it may have been canceled from this side
}
// "afterConnect"
// check if channel could be created (due to shutdown)
if (udpClient == null)
{
const string msg = "Could not create a UDP socket. (Due to shutdown.)";
Logger.Warn(msg);
tcsResponse.SetException(new TaskFailedException(msg));
return;
}
Logger.Debug("About to connect to {0} with channel {1}, ff = {2}.", message.Recipient, udpClient, isFireAndForget);
// send request message
// processes client-side outbound pipeline
// (await for possible exception re-throw, does not block)
await udpClient.SendMessageAsync(message);
// if not fire-and-forget, receive response
if (isFireAndForget)
{
Logger.Debug("Fire and forget message {0} sent. Close channel {1} now.", message, udpClient);
tcsResponse.SetResult(null); // set FF result
}
else
{
// receive response message
// processes client-side inbound pipeline
await udpClient.ReceiveMessageAsync();
}
udpClient.Close();
}
/// <summary>
/// Sends a message via TCP.
/// </summary>
/// <param name="handler">The handler to deal with the response message.</param>
/// <param name="tcsResponse">The TCS for the response message. (FutureResponse equivalent.)</param>
/// <param name="message">The message to send.</param>
/// <param name="channelCreator">The channel creator for the TCP channel.</param>
/// <param name="idleTcpSeconds">The idle time until message fail.</param>
/// <param name="connectTimeoutMillis">The idle time for the connection setup.</param>
/// <param name="peerConnection"></param>
/// <returns></returns>
public async Task SendTcpAsync(IInboundHandler handler, TaskCompletionSource<Message.Message> tcsResponse,
Message.Message message, ChannelCreator channelCreator, int idleTcpSeconds, int connectTimeoutMillis,
PeerConnection peerConnection)
{
// no need to continue if already finished
if (tcsResponse.Task.IsCompleted)
{
return;
}
RemovePeerIfFailed(tcsResponse, message);
bool isFireAndForget = handler == null;
// we need to set the neighbors if we use relays
if (message.Sender.IsRelayed && message.Sender.PeerSocketAddresses.Count != 0)
{
message.SetPeerSocketAddresses(message.Sender.PeerSocketAddresses);
}
if (peerConnection != null && peerConnection.Channel != null && peerConnection.Channel.IsOpen)
{
var channel = SendTcpPeerConnection(peerConnection, handler, channelCreator, tcsResponse);
await AfterConnectAsync(tcsResponse, message, channel, isFireAndForget);
}
else if (channelCreator != null)
{
var timeoutHandler = CreateTimeoutHandler(tcsResponse, idleTcpSeconds, handler == null);
// check relay
if (message.Recipient.IsRelayed)
{
// check if reverse connection is possible
if (!message.Sender.IsRelayed)
{
await HandleRconAsync(handler, tcsResponse, message, channelCreator, connectTimeoutMillis, peerConnection,
timeoutHandler);
}
else
{
await HandleRelayAsync(handler, tcsResponse, message, channelCreator, idleTcpSeconds, connectTimeoutMillis,
peerConnection, timeoutHandler);
}
}
// normal connection
else
{
await ConnectAndSendAsync(handler, tcsResponse, channelCreator, connectTimeoutMillis, peerConnection,
timeoutHandler, message);
}
}
}
/// <summary>
/// Decodes the 8 content types from an integer (32 bit).
/// </summary>
/// <param name="contentTypes">The 8 content types to be decoded.</param>
/// <param name="message">The decoded content types.</param>
/// <returns></returns>
public static Message.Content[] DecodeContentTypes(int contentTypes, Message message)
{
var result = new Message.Content[Message.ContentTypeLength];
for (int i = 0; i < Message.ContentTypeLength; i++)
{
var content = (Message.Content) (contentTypes & Utils.Utils.Mask0F);
result[i] = content;
if (content == Message.Content.PublicKeySignature)
{
message.SetHintSign();
}
contentTypes >>= 4;
}
return result;
}