refactor(localdb): one replication predicate shared by table registration and the alarm drain gate (#603)

The drain gate counted SyncListenPort; a port with no ApiKey shares nothing (fail-closed passive endpoint), and an ApiKey-only passive node shares its queue but was never gated. Claude-Session: https://claude.ai/code/session_01Ef2ozxS7QPanGT8uoATbTe
2026-10-08 06:56:00 -04:00
parent 1b37b2f2b0
commit 4f6231fa40
6 changed files with 94 additions and 18 deletions
@@ -0,0 +1,32 @@
+using Microsoft.Extensions.Configuration;
+using Shouldly;
+using Xunit;
+
+namespace ZB.MOM.WW.OtOpcUa.Runtime.Tests.Historian;
+
+/// <summary>#603: the single "is this node's LocalDb replicated" predicate shared by table registration and the alarm drain gate.</summary>
+public sealed class LocalDbReplicationPolicyTests
+{
+    private static IConfiguration Config(params (string Key, string? Value)[] pairs) =>
+        new ConfigurationBuilder()
+            .AddInMemoryCollection(pairs.Select(p => new KeyValuePair<string, string?>(p.Key, p.Value)))
+            .Build();
+
+    /// <summary>PeerAddress OR ApiKey counts; the listen port alone and blank values do not.</summary>
+    [Theory]
+    [InlineData("LocalDb:Replication:PeerAddress", "http://peer:9001", true)]
+    [InlineData("LocalDb:Replication:ApiKey", "k", true)]
+    [InlineData("LocalDb:SyncListenPort", "9001", false)]
+    [InlineData("LocalDb:Replication:ApiKey", "  ", false)]
+    public void IsConfigured_follows_the_PeerAddress_or_ApiKey_rule(string key, string value, bool expected)
+    {
+        LocalDbReplicationPolicy.IsConfigured(Config((key, value))).ShouldBe(expected);
+    }
+
+    /// <summary>No replication keys at all is an unpaired node.</summary>
+    [Fact]
+    public void IsConfigured_is_false_for_an_empty_configuration()
+    {
+        LocalDbReplicationPolicy.IsConfigured(Config()).ShouldBeFalse();
+    }
+}