Add Galaxy repository API and clients

src/MxGateway.Tests/Gateway/Grpc/MxAccessGatewayServiceTests.cs

@@ -1,3 +1,4 @@
+using System.Diagnostics.Metrics;
 using System.Runtime.CompilerServices;
 using Google.Protobuf.WellKnownTypes;
 using Grpc.Core;
@@ -5,6 +6,7 @@ using Microsoft.Extensions.Logging.Abstractions;
 using MxGateway.Contracts;
 using MxGateway.Contracts.Proto;
 using MxGateway.Server.Grpc;
+using MxGateway.Server.Metrics;
 using MxGateway.Server.Security.Authentication;
 using MxGateway.Server.Security.Authorization;
 using MxGateway.Server.Sessions;
@@ -163,6 +165,50 @@ public sealed class MxAccessGatewayServiceTests
         Assert.Equal("session-1", sessionManager.LastReadEventsSessionId);
     }
 
+    [Fact]
+    public async Task StreamEvents_WhenEventIsWritten_RecordsSendDuration()
+    {
+        using GatewayMetrics metrics = new();
+        using MeterListener listener = new();
+        List<string> families = [];
+        listener.InstrumentPublished = (instrument, meterListener) =>
+        {
+            if (instrument.Meter.Name == GatewayMetrics.MeterName
+                && instrument.Name == "mxgateway.events.stream_send.duration")
+            {
+                meterListener.EnableMeasurementEvents(instrument);
+            }
+        };
+        listener.SetMeasurementEventCallback<double>(
+            (instrument, measurement, tags, _) =>
+            {
+                if (instrument.Name != "mxgateway.events.stream_send.duration")
+                {
+                    return;
+                }
+
+                foreach (KeyValuePair<string, object?> tag in tags)
+                {
+                    if (tag.Key == "family" && tag.Value is string family)
+                    {
+                        families.Add(family);
+                    }
+                }
+            });
+        listener.Start();
+        FakeSessionManager sessionManager = new();
+        sessionManager.Events.Add(CreateWorkerEvent("session-1", workerSequence: 2));
+        MxAccessGatewayService service = CreateService(sessionManager, metrics: metrics);
+        TestServerStreamWriter<MxEvent> writer = new();
+
+        await service.StreamEvents(
+            new StreamEventsRequest { SessionId = "session-1" },
+            writer,
+            new TestServerCallContext());
+
+        Assert.Equal([MxEventFamily.OnDataChange.ToString()], families);
+    }
+
     [Fact]
     public async Task CloseSession_WithBlankSessionId_ThrowsInvalidArgument()
     {
@@ -178,7 +224,8 @@ public sealed class MxAccessGatewayServiceTests
 
     private static MxAccessGatewayService CreateService(
         FakeSessionManager sessionManager,
-        IGatewayRequestIdentityAccessor? identityAccessor = null)
+        IGatewayRequestIdentityAccessor? identityAccessor = null,
+        GatewayMetrics? metrics = null)
     {
         return new MxAccessGatewayService(
             sessionManager,
@@ -186,6 +233,7 @@ public sealed class MxAccessGatewayServiceTests
             new MxAccessGrpcRequestValidator(),
             new MxAccessGrpcMapper(),
             new FakeEventStreamService(sessionManager),
+            metrics ?? new GatewayMetrics(),
             NullLogger<MxAccessGatewayService>.Instance);
     }