Implement worker heartbeat watchdog

src/MxGateway.Worker/Ipc/WorkerPipeClient.cs

@@ -1,4 +1,5 @@
 using System;
+using System.IO;
 using System.IO.Pipes;
 using System.Threading;
 using System.Threading.Tasks;
@@ -11,6 +12,7 @@ public sealed class WorkerPipeClient : IWorkerPipeClient
     public const int DefaultConnectTimeoutMilliseconds = 30000;
 
     private readonly int _connectTimeoutMilliseconds;
+    private readonly Func<Stream, WorkerFrameProtocolOptions, WorkerPipeSession> _sessionFactory;
 
     public WorkerPipeClient()
         : this(DefaultConnectTimeoutMilliseconds)
@@ -18,6 +20,15 @@ public sealed class WorkerPipeClient : IWorkerPipeClient
     }
 
     public WorkerPipeClient(int connectTimeoutMilliseconds)
+        : this(
+            connectTimeoutMilliseconds,
+            (stream, frameOptions) => new WorkerPipeSession(stream, frameOptions))
+    {
+    }
+
+    public WorkerPipeClient(
+        int connectTimeoutMilliseconds,
+        Func<Stream, WorkerFrameProtocolOptions, WorkerPipeSession> sessionFactory)
     {
         if (connectTimeoutMilliseconds <= 0)
         {
@@ -26,6 +37,7 @@ public sealed class WorkerPipeClient : IWorkerPipeClient
                 "Worker pipe connect timeout must be greater than zero.");
         }
 
+        _sessionFactory = sessionFactory ?? throw new ArgumentNullException(nameof(sessionFactory));
         _connectTimeoutMilliseconds = connectTimeoutMilliseconds;
     }
 
@@ -48,8 +60,8 @@ public sealed class WorkerPipeClient : IWorkerPipeClient
 
         await ConnectAsync(pipe, cancellationToken).ConfigureAwait(false);
 
-        WorkerPipeSession session = new(pipe, frameOptions);
-        await session.CompleteStartupHandshakeAsync(cancellationToken).ConfigureAwait(false);
+        WorkerPipeSession session = _sessionFactory(pipe, frameOptions);
+        await session.RunAsync(cancellationToken).ConfigureAwait(false);
     }
 
     private Task ConnectAsync(