private void ReceiveCallBack(IAsyncResult Asr)
{
if (_udpClient == null)
{
return;
}
byte[] dat = null;
try
{
dat = _udpClient.EndReceive(Asr, ref _receivedEp);
}
catch (SocketException ex)
{
return;
}
catch (ObjectDisposedException ex)
{
return;
}
OnBytesReceived?.Invoke(dat);
if (OnBytesReceived == null)
{
// store the data if callback is not set
_mutex.WaitOne();
_receivedPackets.AddLast(dat);
_mutex.ReleaseMutex();
}
// 今一度非同期受信を開始
_udpClient.BeginReceive(ReceiveCallBack, this);
}
private async Task StartHandlingClientRequestAsync()
{
while (_disposeToken.IsCancellationRequested == false)
{
_log.Info(() => LogEvent.Create("FAKE Server: Accepting clients."));
_client = await _listener.AcceptTcpClientAsync();
_log.Info(() => LogEvent.Create("FAKE Server: Connected client"));
OnClientConnected?.Invoke();
_semaphoreSlim.Release();
try {
using (_client) {
var buffer = new byte[4096];
var stream = _client.GetStream();
while (!_disposeToken.IsCancellationRequested)
{
var bytesReceived = await stream.ReadAsync(buffer, 0, buffer.Length, _disposeToken.Token);
if (bytesReceived > 0)
{
OnBytesReceived?.Invoke(buffer.Take(bytesReceived).ToArray());
}
}
}
} catch (Exception ex) {
_log.Error(LogEvent.Create(ex, "FAKE Server: Client exception..."));
}
_log.Error(LogEvent.Create("FAKE Server: Client Disconnected."));
await _semaphoreSlim.WaitAsync(); //remove the one client
OnClientDisconnected?.Invoke();
}
}
internal void InvokeBytesReceived(byte[] bytes)
{
OnBytesReceived?.Invoke(this, bytes);
}
/// <summary>
/// Sends a byte array to several recipient peers
/// </summary>
/// <param name="recipients">A list of the recipient peer IDs</param>
/// <param name="bytes">The byte array to send</param>
/// <param name="reliable">Whether data is sent UDP/TCP style</param>
public void SendRaw
(List <short> recipients, byte[] bytes, bool reliable = false)
{
if (recipients == null || recipients.Count == 0)
{
recipients = new List <short> {
1
}
}
;
var message = new Message {
sender = ID,
recipients = recipients.ToArray(),
bytes = bytes
};
var bytesToSend = message.Serialize();
// If we're a client, we only send to the server.
// The server will pass on the message to clients in recipient list
if (CurrentMode == Mode.Client)
{
network.SendData(
id: serverCID,
data: bytesToSend,
offset: 0,
len: bytesToSend.Length,
reliable: reliable
);
}
// If we're the server, we send to all the recipients
else if (CurrentMode == Mode.Server)
{
foreach (var recipient in recipients)
{
if (recipient != ID)
{
network.SendData(
id: new ConnectionId(recipient),
data: bytesToSend,
offset: 0,
len: bytesToSend.Length,
reliable: reliable
);
}
}
}
}
// ================================================
// NETWORK HANDLERS
// ================================================
void Network_OnServerStartSuccess(NetworkEvent e)
{
ID = 0; // server ID is 0
CurrentMode = Mode.Server;
Address = tmpAddress;
OnServerStartSuccess?.Invoke();
OnReceiveID?.Invoke(ID);
}
void Network_OnServerStartFailure(NetworkEvent e)
{
Reset();
OnServerStartFailure?.Invoke(
new Exception(e.GetDataAsString() + e.Info)
);
}
// This is called only on the server, not on the client side
void Network_OnServerStopped(NetworkEvent e)
{
// Using a reserved packet tag,
// we let all the clients know that we have closed the server
if (CurrentMode == Mode.Server)
{
SendPacket(
Peers,
new Packet().WithTag(Packet.ReservedTags.ServerClosed),
true
);
Reset();
OnServerStop?.Invoke();
}
}
void Network_OnNewConnection(NetworkEvent e)
{
if (CurrentMode == Mode.Server)
{
var theNewID = e.ConnectionId.id;
// Notify a new client of its ID is using a reserved tag packet
var tag = Packet.ReservedTags.ClientSetID;
var packet = new Packet().With(tag, theNewID.GetBytes());
SendPacket(theNewID, packet, true);
// Using reserved tag packets, let the new client know about
// all the old clients and the old clients about the new client
foreach (var anOldID in Peers)
{
tag = Packet.ReservedTags.ClientJoined;
packet = new Packet().With(tag, anOldID.GetBytes());
SendPacket(theNewID, packet, true);
tag = Packet.ReservedTags.ClientJoined;
packet = new Packet().With(tag, theNewID.GetBytes());
SendPacket(anOldID, packet, true);
}
Peers.Add(theNewID);
OnClientJoined?.Invoke(theNewID);
}
else if (CurrentMode == Mode.Idle)
{
serverCID = e.ConnectionId;
CurrentMode = Mode.Client;
// Add the server as a peer. To the client, server ID is 0
Peers.Add(0);
Address = tmpAddress;
OnConnected?.Invoke();
}
}
void Network_OnConnectionFailed(NetworkEvent e)
{
Reset();
var ex = new Exception(e.GetDataAsString() + e.Info);
OnConnectionFailed?.Invoke(ex);
}
void Network_OnDisconnection(NetworkEvent e)
{
if (CurrentMode == Mode.Server)
{
Peers.Remove(e.ConnectionId.id);
// Using a reserved tag, we let all the other clients know
// that a client has left
var tag = Packet.ReservedTags.ClientLeft;
var packet = new Packet().WithTag(tag)
.WithPayload(e.ConnectionId.id.GetBytes());
SendPacket(Peers, packet, true);
OnClientLeft?.Invoke(e.ConnectionId.id);
}
else if (CurrentMode == Mode.Client)
{
Reset();
OnDisconnected?.Invoke();
}
}
void Network_OnMessageReceived(NetworkEvent e, bool reliable)
{
var data = e.GetDataAsByteArray();
var message = Message.Deserialize(data);
var packet = Packet.Deserialize(message.bytes);
// Try to look for reserved keywords
if (packet != null && packet.Tag.StartsWith("reserved"))
{
switch (packet.Tag)
{
case Packet.ReservedTags.ClientJoined:
if (CurrentMode == Mode.Client)
{
var cid = packet.Payload.ToShort();
Peers.Add(cid);
OnClientJoined?.Invoke(cid);
}
break;
case Packet.ReservedTags.ClientLeft:
if (CurrentMode == Mode.Client)
{
var cid = packet.Payload.ToShort();
Peers.Remove(cid);
OnClientLeft?.Invoke(cid);
}
break;
case Packet.ReservedTags.ClientSetID:
if (CurrentMode == Mode.Client)
{
ID = packet.Payload.ToShort();
OnReceiveID?.Invoke(ID);
}
break;
case Packet.ReservedTags.ServerClosed:
Reset();
OnRemoteServerClosed?.Invoke();
break;
}
return;
}
// If we were an intended recipient
if (message.recipients.Contains(ID))
{
if (packet != null)
{
OnPacketReceived?.Invoke(message.sender, packet);
}
else
{
OnBytesReceived?.Invoke(message.sender, message.bytes);
}
}
// If we're a server, forward the message to the intended
// recipients, except ourselves
if (CurrentMode == Mode.Server)
{
foreach (var recipient in message.recipients)
{
if (recipient != 0)
{
if (packet == null)
{
packet = new Packet();
packet.WithPayload(message.bytes);
}
var m = new Message {
sender = message.sender,
recipients = new short[] { recipient },
bytes = packet.Serialize()
};
network.SendData(
id: new ConnectionId(recipient),
data: m.Serialize(),
offset: 0,
len: m.Serialize().Length,
reliable: reliable
);
}
}
}
}
void Reset()
{
ID = -1;
CurrentMode = Mode.Idle;
foreach (var peer in Peers)
{
OnClientLeft?.Invoke(peer);
}
Peers.Clear();
Address = null;
}