Initial commit.

Shared/SignalR/TunnelServerBase.cs

@@ -0,0 +1,36 @@
+using Microsoft.AspNetCore.SignalR;
+
+namespace ClientApiPoC.Shared.SignalR {
+    public abstract class TunnelServerBase {
+        protected IHubContext<TunnelHub> HubContext { get; private set; }
+
+        protected ClientTracker Clients { get; private set; }
+
+        public TunnelServerBase(IHubContext<TunnelHub> hubContext, ClientTracker clientTracker) {
+            if (hubContext == null) throw new ArgumentNullException(nameof(hubContext));
+            if (clientTracker == null) throw new ArgumentNullException(nameof(clientTracker));
+            this.HubContext = hubContext;
+            this.Clients = clientTracker;
+        }
+
+        protected ISingleClientProxy? TryGetClient(string clientId) {
+            ISingleClientProxy? client;
+            try {
+                client = this.HubContext.Clients.Client(clientId);
+            } catch {
+                client = null;
+            }
+            return client;
+        }
+
+        protected IDictionary<string, ISingleClientProxy> GetAllClients() {
+            var results = new Dictionary<string, ISingleClientProxy>();
+            var allClientIds = this.Clients.CurrentClientIds;
+            foreach (var clientId in allClientIds) {
+                var client = TryGetClient(clientId);
+                if (client != null) results.Add(clientId, client);
+            }
+            return results;
+        }
+    }
+}