private async void RttRoutine()
{
while (Running && !RttToken.IsCancellationRequested)
{
try {
await Task.Delay(RttInterval, RttToken.Token);
} catch (Exception) { }
if (!RttToken.IsCancellationRequested)
{
foreach (var keypair in Users)
{
WebSocketUser user = keypair.Value;
if (user.RTT.Sending)
{
user.RTT.Last = RttInterval;
if (user.RTT.Max < RttInterval)
{
user.RTT.Max = RttInterval;
OnRTT?.Invoke(this, new RttEventArgs(user));
}
}
user.RTT.Sending = true;
user.RTT.Sent = DateTime.UtcNow;
await user.Writer.WriteCustomPing();
}
}
}
}
private async Task <(bool, string)> InterpretHeader(WebSocketUser user, Stream ns)
{
string header = await HttpUtils.ReadHeader(ns);
Regex getRegex = new Regex(@"^GET(.*)HTTP\/1\.1", RegexOptions.IgnoreCase);
Match getRegexMatch = getRegex.Match(header);
if (getRegexMatch.Success)
{
string[] lines = header.Split('\n');
foreach (string line in lines)
{
if (line.ToLower().StartsWith("user-agent:"))
{
int index = line.IndexOf(':') + 1;
if (index >= line.Length)
{
break;
}
user.Meta.UserAgent = line.Substring(index, line.Length - index).Trim();
break;
}
}
await DoHandshake(ns, header);
return(true, header);
}
return(false, header);
}
public void RemoveClient(WebSocketUser user, WebSocketDisconnection reason)
{
try {
if (user == null)
{
return;
}
user.Disconnected = true;
WebSocketUser outer;
if (Users.ContainsKey(user.UID))
{
Users.TryRemove(user.UID, out outer);
}
if (user.ListenToken != null)
{
user.ListenToken.Cancel();
}
if (user.Socket != null)
{
user.Socket.Shutdown(SocketShutdown.Both);
}
} catch (Exception) { }
Logger.DebugWrite("INFO", $"Socket got removed. UID: {user.UID}, Reason: {reason}");
OnDisconnect?.Invoke(this, new DisconnectEventArgs(user, reason));
}
private void OnPongReceived(WebSocketUser user)
{
if (user.RTT.Sending)
{
user.RTT.Sending = false;
var span = DateTime.UtcNow - user.RTT.Sent;
var ms = user.RTT.Last = span.TotalMilliseconds;
if (ms < user.RTT.Min || user.RTT.Min == -1)
{
user.RTT.Min = ms;
}
if (ms > user.RTT.Max)
{
user.RTT.Max = ms;
}
OnRTT?.Invoke(this, new RttEventArgs(user));
//Logger.DebugWrite("INFO", $"RTT Last {user.RTT.Last} / {user.RTT.Min} / {user.RTT.Max}");
}
}
public WebSocketWriter(WebSocketUser user)
{
User = user;
Stream = user.Stream;
}
private async Task ListenClient(WebSocketUser user)
{
using (Stream ns = user.Stream) {
WebSocketReader reader = new WebSocketReader();
var res = await InterpretHeader(user, ns);
if (!(res.Item1))
{
RemoveClient(user, WebSocketDisconnection.NoHeader);
return;
}
Logger.DebugWrite("INFO", $"Socket successfully handshaked the update. UID: {user.UID}");
OnHandshake?.Invoke(this, new HandshakeEventArgs(user, res.Item2));
while (Running && !user.ListenToken.IsCancellationRequested)
{
WebSocketFrame frame = await reader.Read(ns, user);
if (frame == null || frame.Opcode == WebSocketOpcode.ConnectionCloseFrame)
{
RemoveClient(user, WebSocketDisconnection.Disconnect);
break;
}
switch (frame.Opcode)
{
case WebSocketOpcode.PingFrame:
if (frame.Data.Length <= 125)
{
await user.Writer.WritePong(frame);
OnPing?.Invoke(this, new PingEventArgs(frame.Data));
}
break;
case WebSocketOpcode.PongFrame:
OnPong?.Invoke(this, new PongEventArgs(frame.Data));
break;
case WebSocketOpcode.BinaryFrame:
user.Meta.LastTime.Binary = DateTime.UtcNow;
if (RttEnabled && frame.Data.Length == 4 && frame.Data[0] == 26 &&
frame.Data[1] == 27 && frame.Data[2] == 28 && frame.Data[3] == 29)
{
OnPongReceived(user);
}
OnMessage?.Invoke(this, new MessageEventArgs(user, frame));
break;
case WebSocketOpcode.TextFrame:
user.Meta.LastTime.Text = DateTime.UtcNow;
OnMessage?.Invoke(this, new MessageEventArgs(user, frame));
break;
}
}
}
}
private async void Listen()
{
Socket = new Socket(AddressFamily.InterNetworkV6, SocketType.Stream, ProtocolType.Tcp);
Socket.SetSocketOption(SocketOptionLevel.IPv6, SocketOptionName.IPv6Only, false);
Socket.Bind(new IPEndPoint(Address, Port));
Socket.Listen(Backlog);
Logger.DebugWrite("INFO", $"WebSocket Server is now listening to new connections.");
while (Running && !ListenToken.IsCancellationRequested)
{
Socket socket = null;
try {
socket = await Socket.AcceptAsync();
} catch (Exception) {
continue;
}
WebSocketUser user = new WebSocketUser()
{
Socket = socket,
Stream = await GetStream(socket),
UID = RandomGen.GenRandomUID(Users, 128),
Server = this
};
if (user.Stream == null)
{
try {
user.Socket.Shutdown(SocketShutdown.Both);
} catch (Exception) { }
continue;
}
while (!Users.TryAdd(user.UID, user))
{
user.UID = RandomGen.GenRandomUID(Users, 12);
}
user.Writer = new WebSocketWriter(user);
Logger.DebugWrite("INFO", $"New Socket connected to the WebSocket Server. {(user.Socket.RemoteEndPoint as IPEndPoint).Address}, UID: {user.UID}");
OnConnect?.Invoke(this, new ConnectEventArgs(user));
CancellationTokenSource cancel = new CancellationTokenSource();
Task task = new Task(async() => {
try {
await ListenClient(user);
} catch (Exception er) {
Logger.DebugWrite("FAILED", "Listen Error: ", er);
RemoveClient(user, WebSocketDisconnection.Disconnect);
}
}, cancel.Token, TaskCreationOptions.LongRunning);
task.Start();
user.ListenTask = task;
user.ListenToken = cancel;
}
}
public async Task <WebSocketFrame> Read(Stream stream, WebSocketUser user)
{
byte first;
try {
byte[] firstData = new byte[1];
await stream.ReadAsync(firstData, 0, firstData.Length);
first = firstData[0];
} catch (Exception) {
return(null);
}
//if (user != null && !WebSocketUtils.IsClientConnected(user)) {
// return null;
//}
try {
byte bitFinFlag = 0x80;
byte opcodeFlag = 0x0F;
bool bitFinSet = (first & bitFinFlag) == bitFinFlag;
WebSocketOpcode opcode = (WebSocketOpcode)(first & opcodeFlag);
byte bitMaskFlag = 0x80;
byte[] secData = new byte[1];
await stream.ReadAsync(secData, 0, secData.Length);
byte second = secData[0];
bool bitMaskSet = (second & bitMaskFlag) == bitMaskFlag;
ulong length = await ReadLength(stream, second);
if (length != 0)
{
byte[] decoded;
if (bitMaskSet)
{
byte[] key = await WebSocketReaderWriter.Read(stream, 4);
byte[] encoded = await WebSocketReaderWriter.Read(stream, length);
decoded = new byte[length];
for (int i = 0; i < encoded.Length; i++)
{
decoded[i] = (byte)(encoded[i] ^ key[i % 4]);
}
}
else
{
decoded = await WebSocketReaderWriter.Read(stream, length);
}
WebSocketFrame frame = new WebSocketFrame(opcode, decoded);
return(frame);
}
}
catch (Exception er) {
Logger.DebugWrite("FAILED", "Error read bytes: ", er);
return(null);
}
return(null);
}
