move more websocket logic into base classes

tanks-backend/TanksServer/Interactivity/WebsocketServerConnection.cs

@@ -0,0 +1,23 @@
+namespace TanksServer.Interactivity;
+
+internal abstract class WebsocketServerConnection(
+    ILogger logger,
+    ByteChannelWebSocket socket)
+{
+    protected readonly ByteChannelWebSocket Socket = socket;
+
+    public Task CloseAsync()
+    {
+        logger.LogDebug("closing connection");
+        return Socket.CloseAsync();
+    }
+
+    public async Task ReceiveAsync()
+    {
+        await foreach (var buffer in Socket.ReadAllAsync())
+            HandleMessage(buffer);
+        logger.LogTrace("done receiving");
+    }
+
+    protected abstract void HandleMessage(Memory<byte> buffer);
+}