在 AiVideo 中能看到图像

增加了在线状态同步逻辑

SHH.CameraDashboard/Invokes/Interceptors/InterceptorPipeline.cs

@@ -0,0 +1,47 @@
+namespace SHH.CameraDashboard
+{
+    // 简单的上下文定义
+    public class ProtocolContext
+    {
+        public string Protocol { get; set; }
+        public byte[] Data { get; set; }
+        public bool IsBlocked { get; set; } = false;
+        public ProtocolContext(string p, byte[] d) { Protocol = p; Data = d; }
+    }
+
+    public interface IProtocolInterceptor
+    {
+        Task OnSendingAsync(ProtocolContext context);
+        Task OnReceivedAsync(ProtocolContext context);
+    }
+
+    public class InterceptorPipeline
+    {
+        // 因为 Dashboard 可能没有复杂的 DI，这里支持手动添加列表
+        private readonly List<IProtocolInterceptor> _interceptors = new List<IProtocolInterceptor>();
+
+        public void Add(IProtocolInterceptor interceptor) => _interceptors.Add(interceptor);
+
+        public async Task<ProtocolContext?> ExecuteSendAsync(string protocol, byte[] data)
+        {
+            var ctx = new ProtocolContext(protocol, data);
+            foreach (var i in _interceptors)
+            {
+                await i.OnSendingAsync(ctx);
+                if (ctx.IsBlocked) return null;
+            }
+            return ctx;
+        }
+
+        public async Task<ProtocolContext?> ExecuteReceiveAsync(string protocol, byte[] data)
+        {
+            var ctx = new ProtocolContext(protocol, data);
+            foreach (var i in _interceptors)
+            {
+                await i.OnReceivedAsync(ctx);
+                if (ctx.IsBlocked) return null;
+            }
+            return ctx;
+        }
+    }
+}