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Program.cs
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usingSystem.Net.WebSockets;
usingSystem.Text;
usingSystem.Collections.Concurrent;
varbuilder=WebApplication.CreateBuilder();
varapp=builder.Build();
app.UseWebSockets();
varcm=newConnectionManager();
intcount=0;
app.Use(async(context,next)=>
{
if(!context.WebSockets.IsWebSocketRequest)
{
awaitnext();
return;
}
varlog=context.RequestServices.GetService<ILoggerFactory>().CreateLogger("app");
varsocket=awaitcontext.WebSockets.AcceptWebSocketAsync();
varsocketId=cm.AddSocket(socket);
awaitReceiveAsync(cm,log,socket,socketId,async(connectionManager,clientRequest)=>
{
varserverReply=Encoding.UTF8.GetBytes($"Echo {++count}{clientRequest}");
varreplyBuffer=newArraySegment<byte>(serverReply);
awaitsocket.SendAsync(replyBuffer,WebSocketMessageType.Text,true,CancellationToken.None);
varbroadcastReply=Encoding.UTF8.GetBytes($"Broadcast {count}{clientRequest}");
varbroadcastBuffer=newArraySegment<byte>(broadcastReply);
varsocketTasks=newList<Task>();
foreach(var(s,sid)inconnectionManager.Other(socketId))
{
socketTasks.Add(s.SendAsync(broadcastBuffer,WebSocketMessageType.Text,true,CancellationToken.None));
log.LogDebug($"Broadcasting to : {sid}");
}
awaitTask.WhenAll(socketTasks);
});
if(socket.State!=WebSocketState.Open)
{
log.LogDebug($"Socket Id {socketId} with status {socket.State}");
}
});
app.Run(async context =>
{
context.Response.Headers.Append("content-type","text/html");
awaitcontext.Response.WriteAsync(@"
<html>
<head>
<script src=""https://code.jquery.com/jquery-3.2.1.min.js"" integrity=""sha256-hwg4gsxgFZhOsEEamdOYGBf13FyQuiTwlAQgxVSNgt4="" crossorigin=""anonymous""></script>
</head>
<body>
<h1>Web Socket (please open this page at 2 tabs at least)</h1>
<input type=""text"" length=""50"" id=""msg"" value=""hello world""/>
<button type=""button"" id=""send"">Send</button>
<button type=""button"" id=""close"">Close</button>
<br/>
<ul id=""responses""></ul>
<script>
$(function(){
var url = ""ws://localhost:5000"";
var socket = new WebSocket(url);
var send = $(""#send"");
var close = $(""#close"");
var msg = $(""#msg"");
var responses = $(""#responses"");
socket.onopen = function(e){
responses.append(`<li>Socket opened</li>`);
send.click(function(){
if (socket.readyState !== WebSocket.OPEN){
alert('Socket is closed. Cannot send message.');
return;
}
socket.send(msg.val());
});
};
close.click(function(){
if (socket.readyState !== WebSocket.OPEN){
alert('You cannot close this connection because it is already closed');
return;
}
socket.close();
});
socket.onmessage = function(e){
var response = e.data;
responses.append(`<li>${e.data.trim()}</li>`);
};
socket.onclose = function(e){
responses.append(`<li>Socket closed</li>`);
};
});
</script>
</body>
</html>");
});
app.Run();
asyncTaskReceiveAsync(ConnectionManagercm,ILoggerlog,WebSocketsocket,stringsocketId,Func<ConnectionManager,string,Task>responseHandlerAsync)
{
varbufferSize=newbyte[4];//This is especially small just to exercise the code that handles data that is larger than buffer
varreceiveBuffer=newArraySegment<byte>(bufferSize);
WebSocketReceiveResultresult;
while(socket.State==WebSocketState.Open)
{
using(varms=newMemoryStream())
{
do
{
result=awaitsocket.ReceiveAsync(receiveBuffer,CancellationToken.None);
if(result.MessageType==WebSocketMessageType.Close)
{
log.LogDebug($"Socket Id {socketId} : Receive closing message.");
varremovalStatus=cm.RemoveSocket(socketId);
log.LogDebug($"Socket Id {socketId} removal status {removalStatus}.");
break;
}
if(result.MessageType!=WebSocketMessageType.Text)
thrownewException("Unexpected Message");
ms.Write(receiveBuffer.Array,receiveBuffer.Offset,result.Count);
}
while(!result.EndOfMessage&&!result.CloseStatus.HasValue);
if(result.MessageType==WebSocketMessageType.Text)
{
ms.Seek(0,SeekOrigin.Begin);
stringclientRequest=string.Empty;
using(varreader=newStreamReader(ms,Encoding.UTF8))
{
clientRequest=reader.ReadToEnd();
}
log.LogDebug($"Socket Id {socketId} : Receive: {clientRequest}");
awaitresponseHandlerAsync(cm,clientRequest);
}
if(result.CloseStatus.HasValue)
break;
}
}
}
publicclassConnectionManager
{
ConcurrentDictionary<string,WebSocket>_sockets=newConcurrentDictionary<string,WebSocket>();
publicstringAddSocket(WebSocketsocket)
{
varid=Guid.NewGuid().ToString();
if(!_sockets.TryAdd(id,socket))
thrownewException($"Problem in adding socket with Id {id}");
returnid;
}
publicboolRemoveSocket(stringid)=>_sockets.TryRemove(id,outWebSocketsocket);
publicList<(WebSocketsocket,stringid)>Other(stringid)=>_sockets.Where(x =>x.Key!=id).Select(x =>(socket:x.Value,id:x.Key)).ToList();
}
