Initial commit.

Shared/SignalR/TunnelHub.cs

@@ -0,0 +1,20 @@
+using Microsoft.AspNetCore.SignalR;
+
+namespace ClientApiPoC.Shared.SignalR {
+    public sealed class TunnelHub : Hub {
+        private ClientTracker _clientTracker;
+
+        public TunnelHub(ClientTracker clientTracker) : base() {
+            if (clientTracker == null) throw new ArgumentNullException(nameof(clientTracker));
+            _clientTracker = clientTracker;
+        }
+
+        public override sealed async Task OnConnectedAsync() {
+            _ = _clientTracker.TryAddClientId(this.Context.ConnectionId);
+        }
+
+        public override sealed async Task OnDisconnectedAsync(Exception exception) {
+            _ = _clientTracker.TryRemoveClientId(this.Context.ConnectionId);
+        }
+    }
+}