Joseph Doherty
82a0c298ce
In T21 press pass 1, two REAL tags diverged only because their live values moved between the sequential libplctag and native phases (WW_M4ActualTemp 384.887 -> 385.138). The libplctag phase now reads every selected tag a second time, paced, before native starts (TransportObservations.ProbeReads). A tag whose two libplctag reads both succeed and differ is classed live. For a live tag, parity still requires: - the same status (and the native-TypeMismatch rule); - no decode error; - the same raw length; - the same CIP type code when both sides expose one (native records it now; libplctag.NET 1.5.2 does not); - the same decoded shape. Value equality is not required. Live tags get their own list and a "libplctag probe" table column, and are counted as neither expected nor unexpected divergences. A tag that reads stable on libplctag but differs on native is still an unexpected divergence, and a missing or failed probe never makes a tag live. The offline pin A_live_value_is_compared_structurally_and_a_stable_one_by_value goes red with the live branch disabled. Claude-Session: https://claude.ai/code/session_01Ef2ozxS7QPanGT8uoATbTe
400 lines
22 KiB
C#
400 lines
22 KiB
C#
using System.Buffers.Binary;
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using System.Globalization;
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using System.Reflection;
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using System.Runtime.CompilerServices;
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using Shouldly;
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using Xunit;
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using ZB.MOM.WW.OtOpcUa.Driver.Ab.Transport;
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namespace ZB.MOM.WW.OtOpcUa.Driver.AbCip.IntegrationTests.Differential;
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/// <summary>Runs the differential alone: no other suite may hold a session to the target meanwhile.</summary>
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[CollectionDefinition(Name, DisableParallelization = true)]
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public sealed class DifferentialCollection : ICollectionFixture<DifferentialRunFixture>
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{
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public const string Name = "AbCip transport differential";
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}
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/// <summary>Performs the one run all differential tests read from, on first use.</summary>
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public sealed class DifferentialRunFixture
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{
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private static readonly TimeSpan RunBudget = TimeSpan.FromMinutes(15);
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private readonly Lazy<Task<DifferentialResult>> _run = new(RunAsync);
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internal Task<DifferentialResult> GetAsync() => _run.Value;
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private static async Task<DifferentialResult> RunAsync()
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{
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var target = DifferentialTarget.FromEnvironment()
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?? throw new InvalidOperationException(DifferentialTarget.SkipReason);
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using var cts = new CancellationTokenSource(RunBudget);
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return await DifferentialRun.ExecuteAsync(target, cts.Token).ConfigureAwait(false);
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}
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}
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/// <summary>
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/// Read-only differential (Task 18): the same tags through libplctag and the native transport against one
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/// endpoint — browse listings, UDT templates and tag reads must agree byte for byte and value for value.
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/// Task 21 runs this against a production press, so the suite is read-only by construction (see
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/// <see cref="The_harness_is_read_only_by_construction"/>), libplctag and native are never connected at the
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/// same time, and the native side runs on one connection held open by an anchor lease.
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/// </summary>
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[Collection(DifferentialCollection.Name)]
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[Trait("Category", "LiveIntegration")]
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public sealed class TransportDifferentialTests(DifferentialRunFixture fixture)
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{
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[Fact]
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public async Task Browse_listings_decode_to_identical_tag_sets_through_both_enumerators()
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{
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var r = await RunOrSkipAsync();
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Log($"## Browse — {r.Target}");
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Log($"libplctag: {r.Libplctag.Browse.Count} tag(s){ErrorSuffix(r.Libplctag.BrowseError)}; " +
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$"native: {r.Native.Browse.Count} tag(s){ErrorSuffix(r.Native.BrowseError)}");
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var onlyLib = DifferentialRun.Missing(r.Libplctag.Browse, r.Native.Browse);
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var onlyNative = DifferentialRun.Missing(r.Native.Browse, r.Libplctag.Browse);
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foreach (var t in onlyLib) Log($"- only libplctag: {t}");
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foreach (var t in onlyNative) Log($"- only native: {t}");
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r.Libplctag.BrowseError.ShouldBeNull();
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r.Native.BrowseError.ShouldBeNull();
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r.Libplctag.Browse.ShouldNotBeEmpty("a browse that returns nothing proves nothing");
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onlyLib.ShouldBeEmpty();
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onlyNative.ShouldBeEmpty();
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}
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[Fact]
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public async Task Every_template_decodes_to_an_identical_shape_through_both_readers()
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{
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var r = await RunOrSkipAsync();
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var ids = r.Libplctag.Shapes.Keys.Concat(r.Libplctag.TemplateErrors.Keys)
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.Concat(r.Native.Shapes.Keys).Concat(r.Native.TemplateErrors.Keys)
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.Distinct().Order().ToList();
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Log($"## Templates — {ids.Count} id(s); truncated by {DifferentialTarget.MaxTemplatesVar}: " +
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$"libplctag {r.Libplctag.TemplatesTruncated}, native {r.Native.TemplatesTruncated}");
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if (ids.Count > 0)
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{
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Log("| Template | libplctag | native | Equal? |");
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Log("|---|---|---|---|");
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}
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foreach (var id in ids)
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{
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var equal = DifferentialRun.ShapesEqual(r.Libplctag.Shapes.GetValueOrDefault(id), r.Native.Shapes.GetValueOrDefault(id));
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Log($"| {id} | {Shape(r.Libplctag, id)} | {Shape(r.Native, id)} | {(equal ? "yes" : "**NO**")} |");
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}
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var problems = DifferentialRun.TemplateProblems(r.Libplctag, r.Native);
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foreach (var p in problems) Log($"- PROBLEM: {p}");
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problems.ShouldBeEmpty();
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}
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[Fact]
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public async Task Every_selected_tag_reads_identically_through_both_transports()
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{
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var r = await RunOrSkipAsync();
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Log($"## Reads — {r.Selection.Count} tag(s), {r.Target}");
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Log("Selection by origin: " + string.Join(", ",
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r.Selection.GroupBy(t => t.Origin).Select(g => $"{g.Key} {g.Count()}")));
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Log("| Tag | Type | libplctag status | native status | libplctag probe | Equal? |");
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Log("|---|---|---|---|---|---|");
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var unexpected = new List<string>();
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var expected = new List<string>();
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var live = new List<string>();
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foreach (var tag in r.Selection)
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{
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var lib = r.Libplctag.Reads[tag.Name];
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var nat = r.Native.Reads[tag.Name];
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var probe = r.Libplctag.ProbeReads.GetValueOrDefault(tag.Name);
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var verdict = Compare(tag, lib, nat, probe);
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switch (Classify(verdict))
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{
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case Verdict.Expected: expected.Add($"{tag.Name}: {verdict}"); break;
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case Verdict.Live: live.Add($"{tag.Name} (lib {Detail(lib)}; lib probe {Detail(probe!)}; native {Detail(nat)})"); break;
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case Verdict.Unexpected: unexpected.Add($"{tag.Name}: {verdict} (lib {Detail(lib)}; native {Detail(nat)})"); break;
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}
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Log($"| `{tag.Name}` | {tag.Type?.ToString() ?? "?"}{(tag.IsArray ? $"[{tag.ElementCount}]" : "")} | " +
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$"{StatusName(lib.Status)} | {StatusName(nat.Status)} | {ProbeColumn(lib, probe)} | {verdict} |");
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}
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Log("");
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Log($"Unexpected divergences: {unexpected.Count}; expected divergences: {expected.Count}; " +
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$"live tags (value moved between the two libplctag reads; compared by status, length, type code and shape): {live.Count}.");
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foreach (var e in expected) Log($"- expected: {e}");
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foreach (var l in live) Log($"- live: {l}");
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foreach (var u in unexpected) Log($"- UNEXPECTED: {u}");
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var coverage = DifferentialRun.SelectionCoverageProblems(r.Target, r.Libplctag, r.Selection);
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foreach (var c in coverage) Log($"- COVERAGE: {c}");
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r.Selection.ShouldNotBeEmpty("a run that reads nothing proves nothing");
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unexpected.ShouldBeEmpty();
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coverage.ShouldBeEmpty();
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}
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[Fact]
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public async Task Libplctag_and_native_are_never_connected_at_the_same_time()
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{
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var r = await RunOrSkipAsync();
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Log($"TCP connections to the target: baseline {r.ConnectionsBaseline?.ToString(CultureInfo.InvariantCulture) ?? "unobservable"}, " +
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$"before native {r.ConnectionsBeforeNative?.ToString(CultureInfo.InvariantCulture) ?? "unobservable"}, " +
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$"libplctag drain wait {r.LibplctagDrainWait.TotalMilliseconds:0} ms.");
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if (r.ConnectionsBaseline is null)
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Assert.Skip("This OS cannot enumerate TCP connections; the run fell back to a fixed settle before the native phase.");
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// The run itself refuses to start the native phase while libplctag's session is open; this pins it.
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r.ConnectionsBeforeNative.ShouldNotBeNull();
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r.ConnectionsBeforeNative.Value.ShouldBeLessThanOrEqualTo(r.ConnectionsBaseline.Value);
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}
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/// <summary>
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/// T21 press pass 1 ended in "A callback was made on a garbage collected delegate": libplctag tags whose
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/// initialisation failed (NotFound tags, refused latency setups) were left native-side with a live callback.
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/// Every libplctag tag this harness creates goes through the driver's adapters, which now destroy such a tag
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/// (<see cref="LibplctagOrphanRelease"/>); this pins that none had to fall back to being rooted instead.
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/// </summary>
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[Fact]
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public async Task No_failed_libplctag_tag_is_left_with_a_live_native_callback()
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{
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await RunOrSkipAsync();
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Log($"libplctag orphans destroyed so far: {LibplctagOrphanRelease.Released}; rooted (unreleasable): {LibplctagOrphanRelease.RootedCount}.");
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LibplctagOrphanRelease.CanReadHandles.ShouldBeTrue();
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LibplctagOrphanRelease.RootedCount.ShouldBe(0);
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}
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[Fact]
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public async Task The_native_side_makes_exactly_one_forward_open_over_the_whole_run()
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{
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var r = await RunOrSkipAsync();
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if (!r.Target.CountOpens)
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Assert.Skip($"{DifferentialTarget.CountOpensVar} is not 1 — the process-wide Forward Open counter is only " +
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"trusted when the differential runs alone.");
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Log($"Native Forward Opens over the run: {r.NativeForwardOpens}.");
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r.NativeForwardOpens.ShouldBe(1);
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}
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/// <summary>
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/// Offline guard — deliberately NOT gated on the endpoint, so it runs in every build. Fails if any
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/// source file of this harness names a write-capable member, and, independently of the source text,
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/// if any compiled method of a harness type calls one.
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/// </summary>
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[Fact]
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public void The_harness_is_read_only_by_construction()
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{
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// Built by concatenation so this file's own text never matches itself.
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string[] forbidden =
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[
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"Write" + "Async", "Encode" + "Value", "WriteBit" + "InDInt", "Send" + "Async", "AbCip" + "Driver",
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];
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// IL half (review r1 M1): method names match by prefix; the driver type matches by declaring type,
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// since the driver type's own members are named .ctor / ReadAsync / ..., never the type name.
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var forbiddenType = "AbCip" + "Driver";
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var dir = Path.GetDirectoryName(ThisFile())!;
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var sources = Directory.GetFiles(dir, "*.cs");
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sources.ShouldContain(f => Path.GetFileName(f) == nameof(TransportDifferentialTests) + ".cs");
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// Task 21's latency comparison and its run helper are part of the harness the press sees: pinned in scope,
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// so moving either out of this folder (or namespace) fails the guard instead of silently escaping it.
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sources.ShouldContain(f => Path.GetFileName(f) == nameof(PollLatencyComparisonTests) + ".cs");
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sources.ShouldContain(f => Path.GetFileName(f) == nameof(PollLatencyRun) + ".cs");
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var textHits = (from f in sources
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let text = File.ReadAllText(f)
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from token in forbidden
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where text.Contains(token, StringComparison.Ordinal)
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select $"{Path.GetFileName(f)} names {token}").ToList();
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textHits.ShouldBeEmpty();
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var harnessTypes = typeof(TransportDifferentialTests).Assembly.GetTypes()
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.Where(t => t.Namespace == typeof(TransportDifferentialTests).Namespace).ToList();
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harnessTypes.ShouldContain(typeof(TransportDifferentialTests));
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harnessTypes.ShouldContain(typeof(PollLatencyComparisonTests));
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harnessTypes.ShouldContain(typeof(PollLatencyRun));
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var callHits = (from t in harnessTypes
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from m in MethodsOf(t)
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from callee in CalleesOf(m)
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where forbidden.Any(f => callee.Name.StartsWith(f, StringComparison.Ordinal))
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|| callee.DeclaringType?.Name.StartsWith(forbiddenType, StringComparison.Ordinal) == true
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select $"{t.Name}.{m.Name} calls {callee.DeclaringType?.Name}.{callee.Name}").ToList();
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callHits.ShouldBeEmpty();
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}
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/// <summary>
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/// Offline falsifiability check of the verdicts: a harness whose comparison could never say NO would
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/// pass every live run vacuously.
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/// </summary>
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[Fact]
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public void The_comparison_flags_every_divergence_and_excuses_only_a_native_type_mismatch()
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{
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var dint = new SelectedTag("T", AbCipDataType.DInt, 1, false, "scalar");
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var ok = new ReadObservation((int)AbStatus.Ok, null, [1, 0, 0, 0], 1);
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Compare(dint, ok, ok with { }).ShouldBe("yes");
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Compare(dint, ok, ok with { Raw = [2, 0, 0, 0] }).ShouldBe("**NO: raw**");
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Compare(dint, ok, ok with { Raw = null }).ShouldBe("**NO: raw**");
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Compare(dint, ok, ok with { Decoded = 2 }).ShouldBe("**NO: value**");
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Compare(dint, ok, new ReadObservation((int)AbStatus.NotFound, "NotFound", null, null)).ShouldBe("**NO: status**");
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Compare(dint, ok, ok with { Error = "boom" }).ShouldBe("**NO: error**");
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var notFound = new ReadObservation((int)AbStatus.NotFound, "NotFound", null, null);
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Compare(dint, notFound, notFound with { }).ShouldBe("yes");
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Compare(dint, ok, new ReadObservation((int)AbStatus.TypeMismatch, null, [1, 0, 0, 0], null))
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.ShouldStartWith("expected");
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// Only that direction is excused: libplctag refusing what native accepts is a real divergence.
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Compare(dint, new ReadObservation((int)AbStatus.TypeMismatch, null, [1, 0, 0, 0], null), ok)
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.ShouldBe("**NO: status**");
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var array = new SelectedTag("A", AbCipDataType.Real, 2, true, "array");
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var arr = new ReadObservation((int)AbStatus.Ok, null, new byte[8], new[] { float.NaN, 1f });
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Compare(array, arr, arr with { Decoded = new[] { float.NaN, 1f } }).ShouldBe("yes");
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Compare(array, arr, arr with { Decoded = new[] { float.NaN, 2f } }).ShouldBe("**NO: value**");
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}
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/// <summary>
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/// Offline pin of the live-drift handling (T21 press pass 1): a value that moved between the two libplctag
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/// reads is compared structurally, while a value libplctag read stably and native read differently is still
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/// an unexpected divergence. Removing the live handling turns the first assertion into "**NO: raw**".
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/// </summary>
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[Fact]
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public void A_live_value_is_compared_structurally_and_a_stable_one_by_value()
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{
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var real = new SelectedTag("WW_M4ActualTemp", AbCipDataType.Real, 1, false, "scalar");
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ReadObservation Obs(float v) => new((int)AbStatus.Ok, null, BitConverter.GetBytes(v), v);
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var lib = Obs(384.88684f);
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var probe = Obs(384.95f);
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var nat = Obs(385.13782f) with { TypeCode = 0xCA };
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// Live: the libplctag value moved by itself, so a different native value is not a divergence.
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DifferentialRun.IsLive(lib, probe).ShouldBeTrue();
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Compare(real, lib, nat, probe).ShouldBe("live");
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Classify(Compare(real, lib, nat, probe)).ShouldBe(Verdict.Live);
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// ...but everything structural still has to match.
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Compare(real, lib, nat with { Status = (int)AbStatus.NotFound, Error = "NotFound" }, probe).ShouldBe("**NO: status**");
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Compare(real, lib, nat with { Raw = new byte[8] }, probe).ShouldBe("**NO: raw length**");
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Compare(real, lib, nat with { Raw = null }, probe).ShouldBe("**NO: raw length**");
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Compare(real, lib with { TypeCode = 0xC4 }, nat, probe).ShouldBe("**NO: type code**");
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Compare(real, lib, nat with { Decoded = 385 }, probe).ShouldBe("**NO: shape**");
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Compare(real, lib, nat with { Decoded = new[] { 385f } }, probe).ShouldBe("**NO: shape**");
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Compare(real, lib, nat with { DecodeError = "boom" }, probe).ShouldBe("**NO: decode**");
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Classify("**NO: raw length**").ShouldBe(Verdict.Unexpected);
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var array = new SelectedTag("A", AbCipDataType.Real, 2, true, "array");
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var arrLib = new ReadObservation((int)AbStatus.Ok, null, new byte[8], new[] { 1f, 2f });
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var arrProbe = arrLib with { Raw = [1, 0, 0, 0, 0, 0, 0, 0], Decoded = new[] { 1.1f, 2f } };
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Compare(array, arrLib, arrLib with { Raw = [2, 0, 0, 0, 0, 0, 0, 0], Decoded = new[] { 3f, 4f } }, arrProbe).ShouldBe("live");
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Compare(array, arrLib, arrLib with { Decoded = new[] { 1f, 2f, 3f } }, arrProbe).ShouldBe("**NO: shape**");
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// Stable: the two libplctag reads agree, so native reading anything else is a real decoding divergence.
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var stableProbe = lib with { };
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DifferentialRun.IsLive(lib, stableProbe).ShouldBeFalse();
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Compare(real, lib, nat, stableProbe).ShouldBe("**NO: raw**");
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Classify(Compare(real, lib, nat, stableProbe)).ShouldBe(Verdict.Unexpected);
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Compare(real, lib, lib with { Decoded = 1f }, stableProbe).ShouldBe("**NO: value**");
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Compare(real, lib, lib with { }, stableProbe).ShouldBe("yes");
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Classify("yes").ShouldBe(Verdict.Equal);
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// A missing or failed probe is never live: the full value comparison applies.
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Compare(real, lib, nat, null).ShouldBe("**NO: raw**");
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Compare(real, lib, nat, new ReadObservation((int)AbStatus.Timeout, "Timeout", null, null)).ShouldBe("**NO: raw**");
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}
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private async Task<DifferentialResult> RunOrSkipAsync()
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{
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if (DifferentialTarget.FromEnvironment() is null) Assert.Skip(DifferentialTarget.SkipReason);
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return await fixture.GetAsync();
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}
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internal enum Verdict { Equal, Expected, Live, Unexpected }
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/// <summary>Which list a verdict string belongs to. Live tags are neither expected nor unexpected divergences.</summary>
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internal static Verdict Classify(string verdict) =>
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verdict == "yes" ? Verdict.Equal
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: verdict == "live" ? Verdict.Live
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: verdict.StartsWith("expected", StringComparison.Ordinal) ? Verdict.Expected
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: Verdict.Unexpected;
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/// <param name="libProbe">libplctag's second (volatility-probe) read of the tag; null ⇒ treated as stable.</param>
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internal static string Compare(SelectedTag tag, ReadObservation lib, ReadObservation nat, ReadObservation? libProbe = null)
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{
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// Spec §5: native refuses a returned type that disagrees with the authored one; libplctag decodes it anyway.
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if (nat.Status == (int)AbStatus.TypeMismatch && lib.Status == (int)AbStatus.Ok)
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return "expected (native TypeMismatch, libplctag Ok)";
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if (lib.Status != nat.Status) return "**NO: status**";
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if (!lib.Succeeded || !nat.Succeeded)
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return lib.Succeeded == nat.Succeeded ? "yes" : "**NO: error**";
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if (lib.DecodeError is not null || nat.DecodeError is not null) return "**NO: decode**";
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if (DifferentialRun.IsLive(lib, libProbe))
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{
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// The value moved between libplctag's own two reads, so native reading a third value proves nothing.
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// Everything that does not depend on the value must still agree.
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if (nat.Raw is null || nat.Raw.Length != lib.Raw!.Length) return "**NO: raw length**";
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if (lib.TypeCode is { } lt && nat.TypeCode is { } nt && lt != nt) return "**NO: type code**";
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if (tag.Type is not null && !DifferentialRun.SameShape(lib.Decoded, nat.Decoded)) return "**NO: shape**";
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return "live";
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}
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if (lib.Raw is null || nat.Raw is null || !lib.Raw.AsSpan().SequenceEqual(nat.Raw)) return "**NO: raw**";
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if (tag.Type is not null && !DifferentialRun.ValuesEqual(lib.Decoded, nat.Decoded)) return "**NO: value**";
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return "yes";
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}
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private static string Detail(ReadObservation o) =>
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o.Error ?? o.DecodeError ?? $"{o.Raw?.Length.ToString(CultureInfo.InvariantCulture) ?? "-"} byte(s) {Hex(o.Raw)} = {Show(o.Decoded)}";
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private static string ProbeColumn(ReadObservation lib, ReadObservation? probe) =>
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probe is null ? "-"
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: DifferentialRun.IsLive(lib, probe) ? "**live**"
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: probe.Succeeded && lib.Succeeded ? "stable"
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: StatusName(probe.Status);
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private static string Hex(byte[]? raw) =>
|
|
raw is null ? "-" : Convert.ToHexString(raw.AsSpan(0, Math.Min(raw.Length, 32))) + (raw.Length > 32 ? "…" : "");
|
|
|
|
private static string Show(object? v) => v switch
|
|
{
|
|
null => "null",
|
|
Array a => "[" + string.Join(",", a.Cast<object?>().Take(8).Select(Show)) + (a.Length > 8 ? ",…" : "") + "]",
|
|
IFormattable f => f.ToString(null, CultureInfo.InvariantCulture),
|
|
_ => v.ToString() ?? "",
|
|
};
|
|
|
|
private static string Shape(TransportObservations o, uint id) =>
|
|
o.TemplateErrors.TryGetValue(id, out var err) ? $"error {err}"
|
|
: o.Shapes.TryGetValue(id, out var s) ? s is null ? "undecodable" : $"{s.TypeName} ({s.Members.Count} members, {s.TotalSize} B)"
|
|
: "not read";
|
|
|
|
private static string StatusName(int status) =>
|
|
Enum.IsDefined(typeof(AbStatus), status) ? ((AbStatus)status).ToString() : status.ToString(CultureInfo.InvariantCulture);
|
|
|
|
private static string ErrorSuffix(string? error) => error is null ? "" : $" (error: {error})";
|
|
|
|
private static void Log(string line) => TestContext.Current.TestOutputHelper?.WriteLine(line);
|
|
|
|
private static string ThisFile([CallerFilePath] string path = "") => path;
|
|
|
|
private static IEnumerable<MethodBase> MethodsOf(Type t)
|
|
{
|
|
const BindingFlags all = BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance
|
|
| BindingFlags.Static | BindingFlags.DeclaredOnly;
|
|
return t.GetMethods(all).Cast<MethodBase>().Concat(t.GetConstructors(all));
|
|
}
|
|
|
|
/// <summary>
|
|
/// Every method a body's IL references by token (call / callvirt / newobj / ldftn). Scans every offset
|
|
/// for a MethodDef / MemberRef / MethodSpec token — over-inclusive by design: a misaligned hit that
|
|
/// happens to resolve can only add a false alarm, never hide a real call.
|
|
/// </summary>
|
|
private static IEnumerable<MethodBase> CalleesOf(MethodBase m)
|
|
{
|
|
var il = m.GetMethodBody()?.GetILAsByteArray();
|
|
if (il is null) yield break;
|
|
var typeArgs = m.DeclaringType is { IsGenericType: true } dt ? dt.GetGenericArguments() : null;
|
|
var methodArgs = m.IsGenericMethod ? m.GetGenericArguments() : null;
|
|
for (var i = 0; i + 4 <= il.Length; i++)
|
|
{
|
|
var token = BinaryPrimitives.ReadInt32LittleEndian(il.AsSpan(i, 4));
|
|
if ((token >> 24) is not (0x06 or 0x0A or 0x2B)) continue;
|
|
MethodBase? callee;
|
|
try { callee = m.Module.ResolveMethod(token, typeArgs, methodArgs); }
|
|
catch (Exception) { continue; }
|
|
if (callee is not null) yield return callee;
|
|
}
|
|
}
|
|
}
|