feat(sessions): route event streaming through SessionEventDistributor

src/ZB.MOM.WW.MxGateway.Server/Sessions/SessionManager.cs

@@ -25,6 +25,8 @@ public sealed class SessionManager : ISessionManager
     private readonly ILogger<SessionManager> _logger;
     private readonly GatewayOptions _options;
     private readonly SemaphoreSlim _sessionSlots;
+    private readonly Grpc.MxAccessGrpcMapper _eventMapper;
+    private readonly ILogger<SessionEventDistributor> _distributorLogger;
 
     /// <summary>
     /// Initializes a new instance of <see cref="SessionManager"/>.
@@ -35,13 +37,17 @@ public sealed class SessionManager : ISessionManager
     /// <param name="metrics">Gateway metrics.</param>
     /// <param name="timeProvider">Time provider for timestamps.</param>
     /// <param name="logger">Logger.</param>
+    /// <param name="eventMapper">Mapper used by each session's event distributor to map worker events to public events.</param>
+    /// <param name="distributorLogger">Logger passed to each session's event distributor pump.</param>
     public SessionManager(
         ISessionRegistry registry,
         ISessionWorkerClientFactory workerClientFactory,
         IOptions<GatewayOptions> options,
         GatewayMetrics metrics,
         TimeProvider? timeProvider = null,
-        ILogger<SessionManager>? logger = null)
+        ILogger<SessionManager>? logger = null,
+        Grpc.MxAccessGrpcMapper? eventMapper = null,
+        ILogger<SessionEventDistributor>? distributorLogger = null)
     {
         _registry = registry ?? throw new ArgumentNullException(nameof(registry));
         _workerClientFactory = workerClientFactory ?? throw new ArgumentNullException(nameof(workerClientFactory));
@@ -49,6 +55,8 @@ public sealed class SessionManager : ISessionManager
         _metrics = metrics ?? throw new ArgumentNullException(nameof(metrics));
         _timeProvider = timeProvider ?? TimeProvider.System;
         _logger = logger ?? NullLogger<SessionManager>.Instance;
+        _eventMapper = eventMapper ?? new Grpc.MxAccessGrpcMapper();
+        _distributorLogger = distributorLogger ?? NullLogger<SessionEventDistributor>.Instance;
         _options = options.Value;
         _sessionSlots = new SemaphoreSlim(_options.Sessions.MaxSessions, _options.Sessions.MaxSessions);
     }
@@ -438,6 +446,12 @@ public sealed class SessionManager : ISessionManager
         DateTimeOffset openedAt = _timeProvider.GetUtcNow();
         string clientCorrelationId = CreateClientCorrelationId(request.ClientSessionName, sessionId);
 
+        SessionEventStreaming eventStreaming = new(
+            _eventMapper,
+            _options.Events,
+            _distributorLogger,
+            _timeProvider);
+
         return new GatewaySession(
             sessionId,
             backendName,
@@ -451,7 +465,8 @@ public sealed class SessionManager : ISessionManager
             startupTimeout,
             shutdownTimeout,
             leaseDuration,
-            openedAt);
+            openedAt,
+            eventStreaming);
     }
 
     private static string CreateClientCorrelationId(