新通讯图像协议对接成功

SHH.CameraService/GrpcImpls/Handlers/GatewayService.cs

@@ -0,0 +1,102 @@
+using Grpc.Core;
+using Grpc.Net.Client;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+using Newtonsoft.Json.Linq;
+using SHH.CameraSdk;
+using SHH.Contracts.Grpc; // 引用 Proto 生成的命名空间
+
+namespace SHH.CameraService
+{
+    /// <summary>
+    /// gRPC 指令接收后台服务
+    /// 职责：
+    /// 1. 维护与 AiVideo 的 gRPC 长连接。
+    /// 2. 完成节点逻辑注册。
+    /// 3. 监听 Server Streaming 指令流并移交给 Dispatcher。
+    /// </summary>
+    public class GatewayService : BackgroundService
+    {
+        private readonly ILogger<GatewayService> _logger;
+        private readonly ServiceConfig _config;
+        private readonly CommandDispatcher _dispatcher;
+
+        public GatewayService(
+            ILogger<GatewayService> logger,
+            ServiceConfig config,
+            CommandDispatcher dispatcher)
+        {
+            _logger = logger;
+            _config = config;
+            _dispatcher = dispatcher;
+        }
+
+        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+        {
+            // 预留系统启动缓冲时间，确保数据库和 SDK 已就绪
+            _logger.LogInformation("[gRPC Bus] 指令接收服务启动，等待环境预热...");
+            await Task.Delay(3000, stoppingToken);
+
+            while (!stoppingToken.IsCancellationRequested)
+            {
+                try
+                {
+                    // 1. 地址适配：将 tcp 转换为 http，并将 127.0.0.1 修正为 localhost 解决 Unimplemented 异常
+                    var ep = _config.CommandEndpoints.First();
+                    string targetUrl = ep.Uri.Replace("tcp://", "http://").Replace("127.0.0.1", "localhost");
+
+                    using var channel = GrpcChannel.ForAddress(targetUrl);
+                    var client = new GatewayProvider.GatewayProviderClient(channel);
+
+                    // --- 第一步：发起节点逻辑注册 (Unary) ---
+                    _logger.LogInformation("[gRPC Bus] 正在发起逻辑注册: {Url}", targetUrl);
+                    var regResp = await client.RegisterInstanceAsync(new RegisterRequest
+                    {
+                        InstanceId = _config.AppId,
+                        Version = "2.0.0-grpc",
+                        ServerIp = "127.0.0.1",
+                        StartTimeTicks = DateTime.Now.Ticks
+                    }, cancellationToken: stoppingToken);
+
+                    if (regResp.Success)
+                    {
+                        _logger.LogInformation("[gRPC Bus] 注册成功。正在建立双向指令通道...");
+
+                        // --- 第二步：开启 Server Streaming 指令流 ---
+                        using var call = client.OpenCommandChannel(new CommandStreamRequest
+                        {
+                            InstanceId = _config.AppId
+                        }, cancellationToken: stoppingToken);
+
+                        // --- 第三步：循环读取服务端推送的指令 ---
+                        // 只要服务端流未断开，此处会一直阻塞等待新消息
+                        while (await call.ResponseStream.MoveNext(stoppingToken))
+                        {
+                            var protoMsg = call.ResponseStream.Current;
+
+                            // 核心变更：不再直接处理业务，而是通过分发器进行路由
+                            // 使用 _ = 异步处理，避免某个 Handler 执行过慢导致指令流阻塞
+                            _ = _dispatcher.DispatchAsync(protoMsg);
+                        }
+                    }
+                }
+                catch (OperationCanceledException)
+                {
+                    // 响应系统正常退出信号
+                    break;
+                }
+                catch (RpcException ex)
+                {
+                    _logger.LogError("[gRPC Bus] RPC 异常 (Status: {Code}): {Msg}", ex.StatusCode, ex.Message);
+                    // 链路异常，进入重连等待阶段
+                    await Task.Delay(5000, stoppingToken);
+                }
+                catch (Exception ex)
+                {
+                    _logger.LogError("[gRPC Bus] 非预期链路异常: {Msg}，5秒后尝试重连", ex.Message);
+                    await Task.Delay(5000, stoppingToken);
+                }
+            }
+        }
+    }
+}