SingnalR with Redis Send Msg to Specific ConnectionID

Question

I am using SingalR for my Chat Application. Wanted to play with Redis and SignalR but I cannot find an working example where i can send msg to specific connectionId. Below Code that works for a single server instance. But when i make it a Web Garden with 3 process it stops working as my server instance that gets the message cannot find the connectionId for that destination UserId to send the message.

private readonly static ConnectionMapping<string> _connections = new ConnectionMapping<string>();
        public void Send(string sendTo, string message, string from)
        {
            string fromclientid = Context.QueryString["clientid"];

            foreach (var connectionId in _connections.GetConnections(sendTo))
            {
                Clients.Client(connectionId).send(fromclientid, message);

            }

            Clients.Caller.send(sendTo, "me: " + message);

        }

            public override Task OnConnected()
            {
            int clientid = Convert.ToInt32(Context.QueryString["clientid"]);

            _connections.Add(clientid.ToString(), Context.ConnectionId);

            }

I have used the example below to setup my box and code but none of them have examples for sending from one client to specific client or group of specific clients.

http://www.asp.net/signalr/overview/performance-and-scaling/scaleout-with-redis
https://github.com/mickdelaney/SignalR.Redis/tree/master/Redis.Sample

score 0 · Accepted Answer · answered Jul 29 '13 at 04:35

The ConnectionMapping instance in your Hub class will not synced across different SignalR server instances. You need to use permanent external storage such as a database or a Windows Azure table. Refer to this link for more details:

http://www.asp.net/signalr/overview/hubs-api/mapping-users-to-connections

SingnalR with Redis Send Msg to Specific ConnectionID

1 Answers1