private async Task RemovePeer(MapPeer peer) {
this.ClosePeer(peer);
if (this._peers.Contains(peer)) {
this._peers.Remove(peer);
}
//
await ProximityMapEnvironment.Default.Log("Search for peers...", true);
}
private void ClosePeer(MapPeer peer) {
if (peer.StreamSocket != null) {
peer.StreamSocket.Dispose();
peer.StreamSocket = null;
}
if (peer.DataWriter != null) {
peer.DataWriter.Dispose();
peer.DataWriter = null;
}
if (peer.DataReader != null) {
peer.DataReader.Dispose();
peer.DataReader = null;
}
}
private async Task PeerReceive(MapPeer peer) {
try {
// Get body size
uint bytesRead = await peer.DataReader.LoadAsync(sizeof(uint));
if (bytesRead == 0) {
await this.RemovePeer(peer);
return;
}
uint length = peer.DataReader.ReadUInt32();
// Get message type
uint bytesRead1 = await peer.DataReader.LoadAsync(sizeof(uint));
if (bytesRead1 == 0) {
await this.RemovePeer(peer);
return;
}
uint type = peer.DataReader.ReadUInt32();
MessageType messageType = (MessageType)Enum.Parse(typeof(MessageType), type.ToString());
// Get body
uint bytesRead2 = await peer.DataReader.LoadAsync(length);
if (bytesRead2 == 0) {
await this.RemovePeer(peer);
return;
}
// Get message
string message = peer.DataReader.ReadString(length);
// Process message
switch (messageType) {
case MessageType.PanningExtent:
await this.Dispatcher.RunAsync(
CoreDispatcherPriority.Normal,
() => {
Envelope env = (Envelope)Envelope.FromJson(message);
this.ProcessExtent(env);
}
);
break;
case MessageType.Ink:
await this.Dispatcher.RunAsync(
CoreDispatcherPriority.Normal,
() => {
MapInkLine line = MapInkLine.FromJson(message);
this.ProcessInk(line);
}
);
break;
}
// Wait for next message
await this.PeerReceive(peer);
}
catch (Exception ex) {
Debug.WriteLine("Reading from socket failed: " + Environment.NewLine + ex.Message + Environment.NewLine + ex.StackTrace);
//this.RemovePeer(peer);
}
}
private async Task PeerSend(MapPeer peer, MessageType messagetype, string text) {
if (peer.StreamSocket == null) { return; }
if (peer.DataWriter == null) { return; }
if (string.IsNullOrWhiteSpace(text)) { return; }
uint length = peer.DataWriter.MeasureString(text);
uint type = (uint)messagetype;
peer.DataWriter.WriteUInt32(length);
peer.DataWriter.WriteUInt32(type);
peer.DataWriter.WriteString(text);
uint numBytesWritten = await peer.DataWriter.StoreAsync();
if (numBytesWritten == 0) {
// Socket error when sending
await this.RemovePeer(peer);
}
}
private async Task PeerConnect(PeerInformation peer, StreamSocket socket) {
// Store socket
DataWriter writer = new DataWriter(socket.OutputStream);
DataReader reader = new DataReader(socket.InputStream);
MapPeer mapPeer = new MapPeer() {
PeerInformation = peer,
StreamSocket = socket,
DataReader = reader,
DataWriter = writer
};
this._peers.Add(mapPeer);
// Listening
await ProximityMapEnvironment.Default.Log("Listening...", true);
// Commence send/recieve loop
await this.PeerReceive(mapPeer);
}