/// <summary>
/// Uses the protocol for new TCP connections that request the protocol
/// </summary>
public void UseProtocol(ITwinoProtocol protocol)
{
List <ITwinoProtocol> list = Protocols.ToList();
ITwinoProtocol old = list.FirstOrDefault(x => x.Name.Equals(protocol.Name, StringComparison.InvariantCultureIgnoreCase));
if (old != null)
{
list.Remove(old);
}
list.Add(protocol);
Protocols = list.ToArray();
}
/// <summary>
/// Uses WebSocket Protocol and accepts HTTP connections which comes with "Upgrade: websocket" header data
/// </summary>
public static ITwinoServer UseWebSockets(this ITwinoServer server,
IProtocolConnectionHandler <WsServerSocket, WebSocketMessage> handler,
HttpOptions options)
{
//we need http protocol is added
ITwinoProtocol http = server.FindProtocol("http");
if (http == null)
{
TwinoHttpProtocol httpProtocol = new TwinoHttpProtocol(server, new WebSocketHttpHandler(), options);
server.UseProtocol(httpProtocol);
}
TwinoWebSocketProtocol protocol = new TwinoWebSocketProtocol(server, handler);
server.UseProtocol(protocol);
return(server);
}
/// <summary>
/// Switches client's protocol to new protocol (finds by name)
/// </summary>
public async Task SwitchProtocol(IConnectionInfo info, string newProtocolName, ConnectionData data)
{
foreach (ITwinoProtocol protocol in Protocols)
{
if (protocol.Name.Equals(newProtocolName, StringComparison.InvariantCultureIgnoreCase))
{
ProtocolHandshakeResult hsresult = await protocol.SwitchTo(info, data);
if (!hsresult.Accepted)
{
info.Close();
return;
}
ITwinoProtocol previous = info.Protocol;
info.Protocol = protocol;
info.Socket = hsresult.Socket;
if (info.Socket != null)
{
info.Socket.SetOnConnected();
}
if (hsresult.Response != null)
{
await info.GetStream().WriteAsync(hsresult.Response);
}
if (info.Socket != null)
{
info.Socket.SetOnProtocolSwitched(previous, info.Protocol);
}
await protocol.HandleConnection(info, hsresult);
return;
}
}
}
/// <summary>
/// Triggers virtual protocol switched
/// </summary>
internal void SetOnProtocolSwitched(ITwinoProtocol previous, ITwinoProtocol current)
{
OnProtocolSwitched(previous, current);
}
/// <summary>
/// Called when client's protocol has switched
/// </summary>
protected virtual void OnProtocolSwitched(ITwinoProtocol previous, ITwinoProtocol current)
{
//not abstract, override is not must. but we do not have anything to do here.
}
