Joseph Doherty
568 lines
24 KiB
C#
568 lines
24 KiB
C#
using Akka.Actor;
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using Akka.TestKit;
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using Akka.TestKit.Xunit2;
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using Microsoft.Extensions.Logging.Abstractions;
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using ZB.MOM.WW.ScadaBridge.Commons.Interfaces.Protocol;
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using ZB.MOM.WW.ScadaBridge.Commons.Messages.DataConnection;
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using ZB.MOM.WW.ScadaBridge.Commons.Messages.Instance;
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using ZB.MOM.WW.ScadaBridge.Commons.Messages.Streaming;
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using ZB.MOM.WW.ScadaBridge.Commons.Types.Flattening;
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using ZB.MOM.WW.ScadaBridge.SiteRuntime.Actors;
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using ZB.MOM.WW.ScadaBridge.SiteRuntime.Persistence;
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using ZB.MOM.WW.ScadaBridge.SiteRuntime.Scripts;
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using System.Text.Json;
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namespace ZB.MOM.WW.ScadaBridge.SiteRuntime.Tests.Actors;
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/// <summary>
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/// Tests for the event-driven <c>WaitForAttribute</c> one-shot waiter registry in
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/// <see cref="InstanceActor"/> (Attributes.WaitAsync spec §3-§5). Covers the
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/// fast-path, change-match, timeout, no-leak (timeout-canceled-on-match), and
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/// predicate-overload acceptance criteria.
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/// </summary>
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public class InstanceActorWaitForAttributeTests : TestKit, IDisposable
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{
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private readonly SiteStorageService _storage;
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private readonly ScriptCompilationService _compilationService;
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private readonly SharedScriptLibrary _sharedScriptLibrary;
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private readonly SiteRuntimeOptions _options;
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private readonly string _dbFile;
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public InstanceActorWaitForAttributeTests()
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{
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_dbFile = Path.Combine(Path.GetTempPath(), $"instance-waitfor-test-{Guid.NewGuid():N}.db");
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_storage = new SiteStorageService(
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$"Data Source={_dbFile}",
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NullLogger<SiteStorageService>.Instance);
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_storage.InitializeAsync().GetAwaiter().GetResult();
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_compilationService = new ScriptCompilationService(
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NullLogger<ScriptCompilationService>.Instance);
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_sharedScriptLibrary = new SharedScriptLibrary(
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_compilationService, NullLogger<SharedScriptLibrary>.Instance);
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_options = new SiteRuntimeOptions();
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}
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private IActorRef CreateInstanceActor(string instanceName, FlattenedConfiguration config)
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{
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return ActorOf(Props.Create(() => new InstanceActor(
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instanceName,
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JsonSerializer.Serialize(config),
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_storage,
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_compilationService,
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_sharedScriptLibrary,
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null, // no stream manager in tests
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_options,
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NullLogger<InstanceActor>.Instance)));
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}
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void IDisposable.Dispose()
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{
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Shutdown();
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try { File.Delete(_dbFile); } catch { /* cleanup */ }
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}
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// ── 1. Fast-path: attribute already at target ────────────────────────────
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/// <summary>
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/// Acceptance §7.1: when the attribute already equals the target at the time
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/// the waiter registers, the actor must reply immediately with Matched=true
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/// (carrying the current value), without scheduling a timeout.
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/// </summary>
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[Fact]
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public void WaitForAttribute_FastPath_AlreadyAtTarget_RepliesMatchedImmediately()
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{
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var config = new FlattenedConfiguration
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{
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InstanceUniqueName = "Pump1",
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Attributes =
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[
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new ResolvedAttribute { CanonicalName = "Flag", Value = "true", DataType = "Boolean" }
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]
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};
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var actor = CreateInstanceActor("Pump1", config);
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actor.Tell(new WaitForAttributeRequest(
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"wfa-fast", "Pump1", "Flag",
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"true", null, TimeSpan.FromSeconds(30), DateTimeOffset.UtcNow));
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var response = ExpectMsg<WaitForAttributeResponse>(TimeSpan.FromSeconds(5));
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Assert.True(response.Matched);
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Assert.False(response.TimedOut);
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Assert.Equal("wfa-fast", response.CorrelationId);
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Assert.Equal("true", response.Value?.ToString());
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}
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// ── 2. Change-match: register first, then drive a value change ───────────
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/// <summary>
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/// Acceptance §7.1/§7.4: registering when the value does NOT match, then
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/// driving the attribute to the target value (via a DCL TagValueUpdate) must
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/// produce a single Matched=true reply carrying the new value.
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/// </summary>
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[Fact]
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public void WaitForAttribute_ChangeMatch_RepliesMatchedWithNewValue()
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{
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const string tag = "ns=3;s=Recipe.Processed";
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var config = new FlattenedConfiguration
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{
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InstanceUniqueName = "Pump1",
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Attributes =
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[
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new ResolvedAttribute
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{
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CanonicalName = "Processed", Value = "false", DataType = "Boolean",
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DataSourceReference = tag, BoundDataConnectionName = "PLC"
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}
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]
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};
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var dcl = CreateTestProbe();
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var actor = ActorOf(Props.Create(() => new InstanceActor(
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"Pump1",
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JsonSerializer.Serialize(config),
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_storage,
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_compilationService,
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_sharedScriptLibrary,
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null,
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_options,
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NullLogger<InstanceActor>.Instance,
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dcl.Ref)));
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dcl.ExpectMsg<SubscribeTagsRequest>(TimeSpan.FromSeconds(5));
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// Register: current value "false" does not match the target. The value
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// arrives from the DCL as a boolean true, whose codec-encoded form is
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// "True" — so the target must be encoded the same way the accessor would
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// (AttributeValueCodec.Encode(true)), NOT the literal string "true".
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var target = ZB.MOM.WW.ScadaBridge.Commons.Types.AttributeValueCodec.Encode(true);
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actor.Tell(new WaitForAttributeRequest(
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"wfa-change", "Pump1", "Processed",
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target, null, TimeSpan.FromSeconds(30), DateTimeOffset.UtcNow));
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// No reply yet — the value has not changed to the target.
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ExpectNoMsg(TimeSpan.FromMilliseconds(300));
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// Drive the value to the target through the DCL ingest path.
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actor.Tell(new TagValueUpdate("PLC", tag, true, QualityCode.Good, DateTimeOffset.UtcNow));
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var response = ExpectMsg<WaitForAttributeResponse>(TimeSpan.FromSeconds(5));
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Assert.True(response.Matched);
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Assert.False(response.TimedOut);
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Assert.Equal("wfa-change", response.CorrelationId);
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Assert.Equal(true, response.Value);
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Assert.Equal("Good", response.Quality);
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}
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// ── 3. Timeout: value never matches ──────────────────────────────────────
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/// <summary>
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/// Acceptance §7.2: when the attribute never reaches the target within the
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/// timeout, the actor replies Matched=false, TimedOut=true (no throw).
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/// </summary>
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[Fact]
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public void WaitForAttribute_Timeout_RepliesNotMatchedTimedOut()
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{
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var config = new FlattenedConfiguration
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{
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InstanceUniqueName = "Pump1",
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Attributes =
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[
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new ResolvedAttribute { CanonicalName = "Flag", Value = "false", DataType = "Boolean" }
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]
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};
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var actor = CreateInstanceActor("Pump1", config);
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actor.Tell(new WaitForAttributeRequest(
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"wfa-timeout", "Pump1", "Flag",
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"true", null, TimeSpan.FromMilliseconds(300), DateTimeOffset.UtcNow));
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// The scheduled timeout fires; allow a tolerant deadline.
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var response = ExpectMsg<WaitForAttributeResponse>(TimeSpan.FromSeconds(3));
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Assert.False(response.Matched);
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Assert.True(response.TimedOut);
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Assert.Equal("wfa-timeout", response.CorrelationId);
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}
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// ── 4. No-leak: timeout canceled on match (no second reply) ──────────────
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/// <summary>
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/// Acceptance §7.5: after a successful change-match, the scheduled timeout
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/// must have been canceled and the waiter removed — so NO second (timeout)
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/// response arrives after the match.
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/// </summary>
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[Fact]
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public void WaitForAttribute_Match_CancelsTimeout_NoSecondReply()
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{
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var config = new FlattenedConfiguration
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{
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InstanceUniqueName = "Pump1",
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Attributes =
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[
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new ResolvedAttribute { CanonicalName = "Flag", Value = "false", DataType = "Boolean" }
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]
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};
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var actor = CreateInstanceActor("Pump1", config);
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// Register with a short timeout, then match BEFORE it would fire.
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actor.Tell(new WaitForAttributeRequest(
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"wfa-noleak", "Pump1", "Flag",
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"true", null, TimeSpan.FromMilliseconds(500), DateTimeOffset.UtcNow));
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// Drive the static value to the target; the actor publishes via
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// HandleAttributeValueChanged, satisfying the waiter.
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actor.Tell(new SetStaticAttributeCommand(
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"set-flag", "Pump1", "Flag", "true", DateTimeOffset.UtcNow));
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// First reply: the match. (A SetStaticAttributeResponse also arrives for
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// the set command — filter for the WaitForAttributeResponse.)
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var matched = ExpectMsg<WaitForAttributeResponse>(TimeSpan.FromSeconds(5));
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Assert.True(matched.Matched);
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Assert.False(matched.TimedOut);
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// The set command's own ack — drain it so the no-msg assert below is clean.
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ExpectMsg<SetStaticAttributeResponse>(TimeSpan.FromSeconds(5));
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// No second WaitForAttributeResponse (the timeout was canceled) for longer
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// than the original 500ms timeout window.
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ExpectNoMsg(TimeSpan.FromSeconds(1));
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}
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// ── 5. Predicate overload ────────────────────────────────────────────────
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/// <summary>
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/// Acceptance §7 (predicate form): registering with a site-local predicate and
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/// then flipping the value so the predicate passes must produce Matched=true.
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/// </summary>
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[Fact]
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public void WaitForAttribute_PredicateOverload_MatchesOnPredicatePass()
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{
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const string tag = "ns=3;s=Level";
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var config = new FlattenedConfiguration
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{
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InstanceUniqueName = "Pump1",
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Attributes =
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[
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new ResolvedAttribute
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{
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CanonicalName = "Level", Value = "0", DataType = "Int32",
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DataSourceReference = tag, BoundDataConnectionName = "PLC"
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}
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]
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};
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var dcl = CreateTestProbe();
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var actor = ActorOf(Props.Create(() => new InstanceActor(
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"Pump1",
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JsonSerializer.Serialize(config),
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_storage,
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_compilationService,
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_sharedScriptLibrary,
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null,
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_options,
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NullLogger<InstanceActor>.Instance,
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dcl.Ref)));
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dcl.ExpectMsg<SubscribeTagsRequest>(TimeSpan.FromSeconds(5));
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// Predicate: value > 50 (current is 0, so no immediate match).
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Func<object?, bool> predicate = v =>
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v is not null && int.TryParse(v.ToString(), out var n) && n > 50;
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actor.Tell(new WaitForAttributeRequest(
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"wfa-pred", "Pump1", "Level",
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null, predicate, TimeSpan.FromSeconds(30), DateTimeOffset.UtcNow));
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ExpectNoMsg(TimeSpan.FromMilliseconds(300));
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// A value below the threshold must NOT satisfy the predicate.
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actor.Tell(new TagValueUpdate("PLC", tag, 25, QualityCode.Good, DateTimeOffset.UtcNow));
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ExpectNoMsg(TimeSpan.FromMilliseconds(300));
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// A value above the threshold satisfies it.
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actor.Tell(new TagValueUpdate("PLC", tag, 75, QualityCode.Good, DateTimeOffset.UtcNow));
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var response = ExpectMsg<WaitForAttributeResponse>(TimeSpan.FromSeconds(5));
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Assert.True(response.Matched);
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Assert.False(response.TimedOut);
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Assert.Equal(75, response.Value);
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}
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// ── 6. "any change" (null target + null predicate) ───────────────────────
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/// <summary>
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/// Spec §4.1: a null TargetValueEncoded + null Predicate means "wait for any
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/// change" (test <c>_ => true</c>). When the attribute ALREADY holds a value at
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/// registration, the fast-path matches IMMEDIATELY — there is no need to wait for
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/// a subsequent update. (A separate test covers the absent-at-registration case.)
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/// </summary>
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[Fact]
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public void WaitForAttribute_AnyChange_MatchesImmediatelyWhenAttributePresent()
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{
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const string tag = "ns=3;s=Speed";
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var config = new FlattenedConfiguration
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{
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InstanceUniqueName = "Pump1",
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Attributes =
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[
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new ResolvedAttribute
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{
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CanonicalName = "Speed", Value = "0", DataType = "Int32",
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DataSourceReference = tag, BoundDataConnectionName = "PLC"
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}
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]
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};
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var dcl = CreateTestProbe();
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var actor = ActorOf(Props.Create(() => new InstanceActor(
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"Pump1",
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JsonSerializer.Serialize(config),
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_storage,
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_compilationService,
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_sharedScriptLibrary,
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null,
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_options,
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NullLogger<InstanceActor>.Instance,
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dcl.Ref)));
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dcl.ExpectMsg<SubscribeTagsRequest>(TimeSpan.FromSeconds(5));
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// "any change" registers with a non-trivial timeout. The fast-path uses
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// `_ => true`, so a currently-present attribute matches immediately.
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actor.Tell(new WaitForAttributeRequest(
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"wfa-any", "Pump1", "Speed",
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null, null, TimeSpan.FromSeconds(30), DateTimeOffset.UtcNow));
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// Speed=0 is already present, so the "any change" test (_ => true) matches
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// immediately on the fast path.
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var response = ExpectMsg<WaitForAttributeResponse>(TimeSpan.FromSeconds(5));
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Assert.True(response.Matched);
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Assert.False(response.TimedOut);
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}
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/// <summary>
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/// Spec §4.1 (companion to the immediate-match case): when the attribute is
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/// ABSENT at registration (no entry in <c>_attributes</c>), the "any change"
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/// waiter does NOT fast-path — it registers, and a later value update on that
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/// attribute is the first thing that satisfies it.
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/// </summary>
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[Fact]
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public void WaitForAttribute_AnyChange_AttributeAbsent_MatchesOnLaterSet()
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{
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var config = new FlattenedConfiguration
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{
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InstanceUniqueName = "Pump1",
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Attributes =
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[
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new ResolvedAttribute { CanonicalName = "Known", Value = "x", DataType = "String" }
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]
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};
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var actor = CreateInstanceActor("Pump1", config);
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// "Ghost" is not a configured attribute, so _attributes has no entry — the
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// fast-path TryGetValue misses and the waiter registers rather than matching.
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actor.Tell(new WaitForAttributeRequest(
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"wfa-absent", "Pump1", "Ghost",
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null, null, TimeSpan.FromSeconds(30), DateTimeOffset.UtcNow));
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ExpectNoMsg(TimeSpan.FromMilliseconds(300));
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// A direct AttributeValueChanged for "Ghost" populates _attributes and
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// re-evaluates the waiter; the any-change test now matches the new value.
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actor.Tell(new AttributeValueChanged(
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"Pump1", "Ghost", "Ghost", "appeared", "Good", DateTimeOffset.UtcNow));
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var response = ExpectMsg<WaitForAttributeResponse>(TimeSpan.FromSeconds(5));
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Assert.True(response.Matched);
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Assert.False(response.TimedOut);
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Assert.Equal("wfa-absent", response.CorrelationId);
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Assert.Equal("appeared", response.Value);
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}
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// ── 7. CRITICAL 1: no spurious match on a quality-only republish ─────────
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/// <summary>
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/// CRITICAL 1 regression: the List-coerce-failure Bad-quality path republishes
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/// the OLD value (quality flipped to Bad) WITHOUT changing <c>_attributes</c>, so
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/// it passes <c>evaluateWaiters:false</c> — registered waiters are NOT re-evaluated
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/// on this non-change republish, must NOT spuriously fire, and must STILL resolve
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/// on the next genuine value change.
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///
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/// <para>
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/// We register an "any-change" waiter (which correctly fast-path matches the
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/// present value and is drained) plus a pending predicate waiter that does not yet
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/// match, then drive the Bad-quality republish and assert NO match is delivered for
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/// the pending waiter, and that a subsequent REAL change resolves it. (Note: the
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/// purest "any-change fires on a non-change republish" symptom is not directly
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/// reproducible — an any-change waiter against a present attribute always fast-path
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/// matches and so never stays pending across a republish; this test guards the
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/// republish path against double-firing / stranding waiters and against the
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/// predicate being re-evaluated on the non-change republish.)
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/// </para>
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/// </summary>
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[Fact]
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public void WaitForAttribute_BadQualityRepublish_NoValueChange_DoesNotMatch()
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{
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const string tag = "ns=3;s=Items";
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var config = new FlattenedConfiguration
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{
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InstanceUniqueName = "Pump1",
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Attributes =
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[
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new ResolvedAttribute
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{
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// Static default {1,2}: a real list value is present from
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// construction so the Bad-quality republish has an OLD value to
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// republish. The waiter below targets a DIFFERENT value so it is
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// genuinely pending (no fast-path match) when the republish fires.
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CanonicalName = "Items", Value = "[1,2]", DataType = "List",
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ElementDataType = "Int32",
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DataSourceReference = tag, BoundDataConnectionName = "PLC"
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}
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]
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};
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var dcl = CreateTestProbe();
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var actor = ActorOf(Props.Create(() => new InstanceActor(
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"Pump1",
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JsonSerializer.Serialize(config),
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_storage,
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_compilationService,
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_sharedScriptLibrary,
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null,
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_options,
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NullLogger<InstanceActor>.Instance,
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dcl.Ref)));
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dcl.ExpectMsg<SubscribeTagsRequest>(TimeSpan.FromSeconds(5));
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// A predicate waiter that matches a list of length >= 3. Current value is
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// {1,2} (length 2) so it does NOT fast-path match — it registers and stays
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// pending. Crucially, the Bad-quality republish below carries the SAME OLD
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// value {1,2} (length 2); with the bug (evaluateWaiters always true) the
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// predicate would be re-evaluated against {1,2} → still false, so this probe
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// also guards the predicate-isolation contract on the republish path.
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Func<object?, bool> lenAtLeast3 = v =>
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v is System.Collections.IList list && list.Count >= 3;
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actor.Tell(new WaitForAttributeRequest(
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"wfa-len3", "Pump1", "Items",
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null, lenAtLeast3, TimeSpan.FromSeconds(30), DateTimeOffset.UtcNow));
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// Also register an "any-change" waiter while the attribute is present — it
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// fast-path matches the current {1,2} immediately. Drain that correct match;
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// it is the documented immediate-match behaviour, not the bug under test.
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actor.Tell(new WaitForAttributeRequest(
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"wfa-any", "Pump1", "Items",
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null, null, TimeSpan.FromSeconds(30), DateTimeOffset.UtcNow));
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var immediate = ExpectMsg<WaitForAttributeResponse>(TimeSpan.FromSeconds(5));
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Assert.Equal("wfa-any", immediate.CorrelationId);
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Assert.True(immediate.Matched);
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// Drive the List-coerce-FAILURE Bad-quality republish: a scalar int cannot
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// coerce to List<Int32>, so the actor sets quality Bad and republishes the
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// OLD value {1,2} WITHOUT changing _attributes (evaluateWaiters:false).
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actor.Tell(new TagValueUpdate("PLC", tag, 999, QualityCode.Good, DateTimeOffset.UtcNow));
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// The pending length>=3 waiter must NOT fire on this non-change republish.
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ExpectNoMsg(TimeSpan.FromMilliseconds(500));
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// A REAL change to a length-3 list resolves the still-pending waiter.
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actor.Tell(new TagValueUpdate("PLC", tag, new[] { 7, 8, 9 }, QualityCode.Good, DateTimeOffset.UtcNow));
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|
var realChange = ExpectMsg<WaitForAttributeResponse>(TimeSpan.FromSeconds(5));
|
|
Assert.Equal("wfa-len3", realChange.CorrelationId);
|
|
Assert.True(realChange.Matched);
|
|
Assert.False(realChange.TimedOut);
|
|
}
|
|
|
|
// ── 8. CRITICAL 2: throwing predicate is isolated ────────────────────────
|
|
|
|
/// <summary>
|
|
/// CRITICAL 2 regression: two waiters on the SAME attribute — one with a
|
|
/// predicate that throws, one a normal value-equality. A single value change
|
|
/// must (a) NOT crash the actor, (b) evict the throwing waiter with a
|
|
/// non-matched error reply, and (c) STILL resolve the normal sibling. Finally
|
|
/// the actor must remain responsive to a subsequent request.
|
|
/// </summary>
|
|
[Fact]
|
|
public void WaitForAttribute_ThrowingPredicate_IsIsolated_SiblingStillMatches()
|
|
{
|
|
const string tag = "ns=3;s=State";
|
|
var config = new FlattenedConfiguration
|
|
{
|
|
InstanceUniqueName = "Pump1",
|
|
Attributes =
|
|
[
|
|
new ResolvedAttribute
|
|
{
|
|
CanonicalName = "State", Value = "init", DataType = "String",
|
|
DataSourceReference = tag, BoundDataConnectionName = "PLC"
|
|
}
|
|
]
|
|
};
|
|
|
|
var dcl = CreateTestProbe();
|
|
var actor = ActorOf(Props.Create(() => new InstanceActor(
|
|
"Pump1",
|
|
JsonSerializer.Serialize(config),
|
|
_storage,
|
|
_compilationService,
|
|
_sharedScriptLibrary,
|
|
null,
|
|
_options,
|
|
NullLogger<InstanceActor>.Instance,
|
|
dcl.Ref)));
|
|
|
|
dcl.ExpectMsg<SubscribeTagsRequest>(TimeSpan.FromSeconds(5));
|
|
|
|
// Waiter A: predicate that returns false for the CURRENT value ("init") so
|
|
// it clears the fast-path and registers, but THROWS once the value becomes
|
|
// "ready" — exercising the resolve-loop guard (not the fast-path guard).
|
|
Func<object?, bool> boom = v =>
|
|
v?.ToString() == "ready" ? throw new InvalidOperationException("kaboom") : false;
|
|
actor.Tell(new WaitForAttributeRequest(
|
|
"wfa-throw", "Pump1", "State",
|
|
null, boom, TimeSpan.FromSeconds(30), DateTimeOffset.UtcNow));
|
|
|
|
// Waiter B: normal value-equality waiting for "ready".
|
|
var target = ZB.MOM.WW.ScadaBridge.Commons.Types.AttributeValueCodec.Encode("ready");
|
|
actor.Tell(new WaitForAttributeRequest(
|
|
"wfa-normal", "Pump1", "State",
|
|
target, null, TimeSpan.FromSeconds(30), DateTimeOffset.UtcNow));
|
|
|
|
ExpectNoMsg(TimeSpan.FromMilliseconds(200));
|
|
|
|
// One change to "ready": evaluates BOTH waiters on this attribute. The
|
|
// throwing one must be evicted (error reply); the normal one must match.
|
|
actor.Tell(new TagValueUpdate("PLC", tag, "ready", QualityCode.Good, DateTimeOffset.UtcNow));
|
|
|
|
// Collect the two replies (order is registry-iteration dependent).
|
|
var r1 = ExpectMsg<WaitForAttributeResponse>(TimeSpan.FromSeconds(5));
|
|
var r2 = ExpectMsg<WaitForAttributeResponse>(TimeSpan.FromSeconds(5));
|
|
var byId = new[] { r1, r2 }.ToDictionary(r => r.CorrelationId);
|
|
|
|
var thrown = byId["wfa-throw"];
|
|
Assert.False(thrown.Matched);
|
|
Assert.False(thrown.TimedOut);
|
|
Assert.NotNull(thrown.ErrorMessage);
|
|
Assert.Contains("Wait predicate threw", thrown.ErrorMessage);
|
|
|
|
var normal = byId["wfa-normal"];
|
|
Assert.True(normal.Matched);
|
|
Assert.False(normal.TimedOut);
|
|
Assert.Equal("ready", normal.Value);
|
|
|
|
// The actor stayed alive and responsive: a follow-up request resolves.
|
|
actor.Tell(new GetAttributeRequest("get-after", "Pump1", "State", DateTimeOffset.UtcNow));
|
|
var get = ExpectMsg<GetAttributeResponse>(TimeSpan.FromSeconds(5));
|
|
Assert.Equal("ready", get.Value);
|
|
|
|
// And the throwing waiter was REMOVED (no longer in the registry): driving
|
|
// another change produces NO further reply for it.
|
|
actor.Tell(new TagValueUpdate("PLC", tag, "again", QualityCode.Good, DateTimeOffset.UtcNow));
|
|
ExpectNoMsg(TimeSpan.FromMilliseconds(500));
|
|
}
|
|
}
|