private void Signaler_MessageFromPeer(object sender, Peer peer)
{
var message = peer.Message;
if (message.Contains("OpenDataChannel"))
{
// A peer has let us know that they have begun initiating a data channel. In this scenario,
// we are the "remote" peer so make sure _isInitiator is false. Begin gathering ice candidates.
_isInitiator = false;
RemotePeer = peer;
OpenDataChannel(peer); // TODO: This is incorrect - message is definitely not the peer's name.
return;
}
if (message.Contains("IceCandidate"))
{
var remoteCandidate = RTCIceCandidate.FromJsonString(message);
_ice.AddRemoteCandidate(remoteCandidate);
// TODO: Notify the ice transport when gathering is complete via the line below so it can change state.
//_ice.AddRemoteCandidate(new RTCIceCandidateComplete());
return;
}
if (message.Contains("IceParameters"))
{
var iceParameters = RTCIceParameters.FromJsonString(message);
// Start the ice transport with the appropriate role based on whether this is the initiator of the call.
var role = _isInitiator ? RTCIceRole.Controlling : RTCIceRole.Controlled;
_ice.Start(_gatherer, iceParameters, role);
return;
}
if (message.Contains("DtlsParameters"))
{
var dtlsParameters = RTCDtlsParameters.FromJsonString(message);
_dtls.Start(dtlsParameters);
Debug.WriteLine("Dtls start called.");
return;
}
// this order guarantees:
if (message.Contains("SctpCapabilities"))
{
// Message ordering: alice -> bob; bob.start(); bob -> alice; alice.start(); alice -> datachannel -> bob
var sctpCaps = RTCSctpCapabilities.FromJsonString(message);
if (!_isInitiator)
{
Debug.WriteLine("Receiver: Waiting for OnDataChannel event and starting sctp.");
// The remote side will receive notification when the data channel is opened.
_sctp.OnDataChannel += Sctp_OnDataChannel;
_sctp.OnStateChange += Sctp_OnStateChange;
_sctp.Start(sctpCaps);
var caps = RTCSctpTransport.GetCapabilities();
_signaler.SendToPeer(RemotePeer.Id, caps.ToJsonString());
}
else
{
// The initiator has received sctp caps back from the remote peer, which means the remote peer
// has already called sctp.start(). It's now safe to open a data channel, which will fire the
// Sctp_OnDataChannel event on the remote side.
Debug.WriteLine("Initiator: Creating the data channel and starting sctp.");
_sctp.OnStateChange += Sctp_OnStateChange;
_sctp.Start(sctpCaps);
_dataChannel = new RTCDataChannel(_sctp, _dataChannelParams);
_dataChannel.OnMessage += DataChannel_OnMessage;
_dataChannel.OnError += DataChannel_OnError;
_dataChannel.OnStateChange += DataChannel_OnStateChange;
Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
{
IsSendEnabled = true;
});
}
}
}
public void HandleMessageFromPeer(string message)
{
if (message.StartsWith("{\"candidate"))
{
Debug.WriteLine("contains IceCandidate (or IceCandidateComplete)");
Json jsonMessage = new Json(message);
RTCIceGathererCandidate remoteCandidate = RTCIceGathererCandidate.Create(jsonMessage);
_ice.AddRemoteCandidate(remoteCandidate);
return;
}
if (message.StartsWith("{\"RTCIceParameters\":"))
{
Debug.WriteLine("contains IceParameters");
Json jsonMessage = new Json(message);
RTCIceParameters iceParameters = new RTCIceParameters(jsonMessage);
// Start the ice transport with the appropriate role based on whether this is the initiator of the call.
var role = _isInitiator ? RTCIceRole.Controlling : RTCIceRole.Controlled;
_ice.Start(_gatherer, iceParameters, role);
return;
}
if (message.StartsWith("{\"RTCDtlsParameters\":"))
{
Debug.WriteLine("contains DtlsParameters");
Json jsonMessage = new Json(message);
RTCDtlsParameters dtlsParameters = new RTCDtlsParameters(jsonMessage);
_dtls.Start(dtlsParameters);
Debug.WriteLine("Dtls start called.");
return;
}
// this order guarantees:
if (message.StartsWith("{\"RTCSctpCapabilities\":"))
{
Debug.WriteLine("contains SctpCapabilities");
Json jsonMessage = new Json(message);
// Message ordering: alice -> bob; bob.start(); bob -> alice; alice.start(); alice -> datachannel -> bob
RTCSctpCapabilities sctpCaps = new RTCSctpCapabilities(jsonMessage);
if (!_isInitiator)
{
Debug.WriteLine("Receiver: Waiting for OnDataChannel event and starting sctp.");
// The remote side will receive notification when the data channel is opened.
_sctp.OnDataChannel += Sctp_OnDataChannel;
_sctp.OnStateChange += Sctp_OnStateChange;
_sctp.Start(sctpCaps);
RTCSctpCapabilities caps = RTCSctpTransport.GetCapabilities();
OnSignalMessageToPeer(caps.ToJson().ToString());
}
else
{
// The initiator has received sctp caps back from the remote peer,
// which means the remote peer has already called sctp.start().
// It's now safe to open a data channel, which will fire the
// Sctp_OnDataChannel event on the remote side.
Debug.WriteLine("Initiator: Creating the data channel and starting sctp.");
_sctp.OnStateChange += Sctp_OnStateChange;
_sctp.Start(sctpCaps);
RTCDataTransport data = RTCDataTransport.Cast(_sctp);
_dataChannel = new RTCDataChannel(data, _dataChannelParams);
_dataChannel.OnMessage += DataChannel_OnMessage;
_dataChannel.OnError += DataChannel_OnError;
_dataChannel.OnOpen += DataChannel_OnOpen;
_dataChannel.OnClose += DataChannel_OnClose;
}
}
}
