fix(audit-log): reconciliation pulls fail over to site NodeB when NodeA is unreachable

SiteEntry gains an additive FallbackGrpcEndpoint; SiteEnumerator now picks NodeA else NodeB as primary (a NodeB-only site is no longer skipped) and carries a distinct NodeB as the fallback. Both GrpcPull{AuditEvents,SiteCalls} clients dial the primary first and, on a transport fault (Unavailable/DeadlineExceeded/ Cancelled/HttpRequestException/SocketException/OperationCanceled), fail over to NodeB once before collapsing to empty — a mapping/unexpected fault does NOT fail over. Keeps the reconciliation loss-recovery net available during a NodeA outage.
2026-07-09 08:57:06 -04:00
parent 0385942c3f
commit bfd2cc7e6f
8 changed files with 382 additions and 100 deletions
@@ -76,6 +76,44 @@ public class SiteEnumeratorTests
        Assert.Empty(result);
    }

+    [Fact]
+    public async Task EnumerateAsync_BothAddresses_ProjectsNodeBAsFallback()
+    {
+        // Task 18: a site with both NodeA and a DISTINCT NodeB yields
+        // SiteEntry(primary=NodeA, FallbackGrpcEndpoint=NodeB).
+        var repository = Substitute.For<ISiteRepository>();
+        repository.GetAllSitesAsync(Arg.Any<CancellationToken>()).Returns(new List<SiteEntity>
+        {
+            SiteWith("site-ab", grpcNodeA: "http://site-a:8083", grpcNodeB: "http://site-b:8083"),
+        });
+
+        var enumerator = new SiteEnumerator(BuildProvider(repository));
+
+        var entry = Assert.Single(await enumerator.EnumerateAsync());
+        Assert.Equal("site-ab", entry.SiteId);
+        Assert.Equal("http://site-a:8083", entry.GrpcEndpoint);
+        Assert.Equal("http://site-b:8083", entry.FallbackGrpcEndpoint);
+    }
+
+    [Fact]
+    public async Task EnumerateAsync_OnlyNodeB_IsNotSkipped_AndHasNoFallback()
+    {
+        // Task 18: a site with a blank NodeA but a valid NodeB is no longer
+        // skipped — NodeB becomes the primary and there is no separate fallback.
+        var repository = Substitute.For<ISiteRepository>();
+        repository.GetAllSitesAsync(Arg.Any<CancellationToken>()).Returns(new List<SiteEntity>
+        {
+            SiteWith("site-bonly", grpcNodeA: "   ", grpcNodeB: "http://site-b:8083"),
+        });
+
+        var enumerator = new SiteEnumerator(BuildProvider(repository));
+
+        var entry = Assert.Single(await enumerator.EnumerateAsync());
+        Assert.Equal("site-bonly", entry.SiteId);
+        Assert.Equal("http://site-b:8083", entry.GrpcEndpoint);
+        Assert.Null(entry.FallbackGrpcEndpoint);
+    }
+
    [Fact]
    public async Task EnumerateAsync_ReturnsEmpty_WhenNoSites()
    {