Websocket handling

[mika76]

Would be great to be able to handle web sockets in a carter way, or is this possible already?

[jchannon]

Not tried but it might just work if you have a route for /ws for example and use signalr

On Sat, 7 Mar 2020 at 08:33, Mladen Mihajlović notifications@github.com wrote:

Would be great to be able to handle web sockets in a carter way, or is this possible already?

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[mika76]

I will give it a try, but I meant websockets directly, not signalR - sometimes just the basics are required :)

[davidfowl]

You can do Websockets with Carter like you would with any ASP.NET Core application.

public class WebSocketModule : CarterModule
{
    public WebSocketModule()
    {
        Get("/ws", async http =>
        {
            if (!http.WebSockets.IsWebSocketRequest)
            {
                http.Response.StatusCode = 400;
                return;
            }

            var websocket = await http.WebSockets.AcceptWebSocketAsync();
            await Echo(websocket);

        });

        static async Task Echo(WebSocket webSocket)
        {
            var buffer = new byte[1024 * 4];
            WebSocketReceiveResult result = await webSocket.ReceiveAsync(buffer, CancellationToken.None);
            while (!result.CloseStatus.HasValue)
            {
                await webSocket.SendAsync(buffer.AsMemory(0, result.Count), result.MessageType, result.EndOfMessage, CancellationToken.None);

                result = await webSocket.ReceiveAsync(buffer, CancellationToken.None);
            }
            await webSocket.CloseAsync(result.CloseStatus.Value, result.CloseStatusDescription, CancellationToken.None);
        }
    }
}

See https://docs.microsoft.com/en-us/aspnet/core/fundamentals/websockets?view=aspnetcore-3.1 for more information.

[jchannon]

Awesome. Thanks. Might be worth adding to the sample project

On Sat, 14 Mar 2020 at 23:18, David Fowler notifications@github.com wrote:

You can do Websockets with Carter like you would with any ASP.NET Core application.

public class WebSocketModule : CarterModule { public WebSocketModule() { Get("/ws", async http => { if (!http.WebSockets.IsWebSocketRequest) { http.Response.StatusCode = 400; return; }

        var websocket = await http.WebSockets.AcceptWebSocketAsync();
        await Echo(websocket);

    });

    static async Task Echo(WebSocket webSocket)
    {
        var buffer = new byte[1024 * 4];
        WebSocketReceiveResult result = await webSocket.ReceiveAsync(buffer, CancellationToken.None);
        while (!result.CloseStatus.HasValue)
        {
            await webSocket.SendAsync(buffer.AsMemory(0, result.Count), result.MessageType, result.EndOfMessage, CancellationToken.None);

            result = await webSocket.ReceiveAsync(buffer, CancellationToken.None);
        }
        await webSocket.CloseAsync(result.CloseStatus.Value, result.CloseStatusDescription, CancellationToken.None);
    }
}

}

See https://docs.microsoft.com/en-us/aspnet/core/fundamentals/websockets?view=aspnetcore-3.1 for more information.

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[mika76]

Brilliant thanks @davidfowl - @jchannon this issue could be closed unless you wanna keep it open for the sample docs?

[jchannon]

We can keep it open until someone ( 😉 ) adds it to the sample app