mbproxy: initial commit through Phase 9 (TxId multiplexing)
Adds the mbproxy service end-to-end. Phases 00-08 implement the production-ready single-listener / 1:1-backend transparent Modbus TCP proxy with bidirectional BCD rewriting for the ~54-PLC DL205/DL260 fleet. Phase 9 replaces the connection layer with a single backend socket per PLC plus MBAP TxId rewriting, lifting the H2-ECOM100's 4-concurrent-client cap as an operational ceiling. Phase 9 additions of note: - PlcMultiplexer + UpstreamPipe + TxIdAllocator + CorrelationMap - InFlightRequest with IReadOnlyList<InterestedParty> (load-bearing for Phase 10 read coalescing — do not collapse to a single field) - Per-request watchdog: surfaces Modbus exception 0x0B to upstream on BackendRequestTimeoutMs, defending against lost responses, dead-PLC paths, and pymodbus 3.13.0's concurrent-multiplexed- request bug (its ServerRequestHandler.last_pdu state race) - Status DTO + HTML gain inFlight / maxInFlight / txIdWraps / disconnectCascades / queueDepth (Tier 1.6 in docs/kpi.md) Tests: 263 unit + 38 E2E. Multiplexer correctness under truly concurrent backend traffic is proved against a stub backend in PlcMultiplexerTests; MultiplexerE2ETests paces requests so pymodbus 3.13's single-PDU framer stays in known-good mode. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Joseph Doherty
@@ -0,0 +1,317 @@
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using System.Collections.Concurrent;
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using System.Net;
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using System.Net.Sockets;
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using Mbproxy;
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using Mbproxy.Configuration;
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using Mbproxy.Options;
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using Mbproxy.Proxy;
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using Mbproxy.Proxy.Supervision;
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using Microsoft.Extensions.Logging;
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using Microsoft.Extensions.Logging.Abstractions;
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using Microsoft.Extensions.Options;
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using Polly;
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using Xunit;
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namespace Mbproxy.Tests.Configuration;
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/// <summary>
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/// Unit tests for <see cref="ConfigReconciler.ApplyAsync"/> using a fake
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/// <see cref="IOptionsMonitor{T}"/> and real (but fast-recovery) supervisors.
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/// Tests operate at the Apply level — no file I/O, no real config reload chain.
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/// </summary>
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[Trait("Category", "Unit")]
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public sealed class ConfigReconcilerTests : IAsyncDisposable
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{
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// ── Helpers ───────────────────────────────────────────────────────────────────────────
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private static int PickFreePort()
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{
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var l = new TcpListener(IPAddress.Loopback, 0);
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l.Start();
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int port = ((IPEndPoint)l.LocalEndpoint).Port;
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l.Stop();
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return port;
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}
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private static PlcOptions MakePlc(string name, int listenPort, string host = "127.0.0.1")
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=> new() { Name = name, ListenPort = listenPort, Host = host, Port = 502 };
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private static MbproxyOptions MakeOptions(PlcOptions[] plcs, BcdTagListOptions? global = null)
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=> new()
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{
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Plcs = plcs,
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BcdTags = global ?? new BcdTagListOptions(),
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AdminPort = 8080,
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};
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private static ResiliencePipeline FastRecovery()
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{
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var profile = new RecoveryProfile { InitialBackoffMs = [50, 50], SteadyStateMs = 50 };
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return PolicyFactory.BuildListenerRecovery(profile, NullLogger.Instance);
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}
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private PlcListenerSupervisor BuildSupervisor(PlcOptions plc)
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{
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ILoggerFactory lf = NullLoggerFactory.Instance;
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return new PlcListenerSupervisor(
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plc,
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new ConnectionOptions(),
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new NoopPduPipeline(),
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lf.CreateLogger<PlcListener>(),
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lf.CreateLogger<Mbproxy.Proxy.Multiplexing.PlcMultiplexer>(),
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lf.CreateLogger($"Mbproxy.Proxy.UpstreamPipe.{plc.Name}"),
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perPlcContext: null,
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FastRecovery(),
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lf.CreateLogger<PlcListenerSupervisor>(),
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backendConnectPipeline: null);
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}
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private ConfigReconciler BuildReconciler(
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IOptionsMonitor<MbproxyOptions> monitor,
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ServiceCounters? counters = null)
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{
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return new ConfigReconciler(
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monitor,
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NullLoggerFactory.Instance,
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counters ?? new ServiceCounters());
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}
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// The reconciler and supervisors tracked for cleanup.
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private readonly List<ConfigReconciler> _reconcilers = [];
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private readonly List<PlcListenerSupervisor> _supervisors = [];
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public async ValueTask DisposeAsync()
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{
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foreach (var r in _reconcilers) r.Dispose();
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using var cts = new CancellationTokenSource(TimeSpan.FromSeconds(5));
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foreach (var s in _supervisors)
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{
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try { await s.StopAsync(cts.Token); } catch { /* best effort */ }
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await s.DisposeAsync();
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}
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}
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// ── Test 1: Happy path ────────────────────────────────────────────────────────────────
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[Fact]
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public async Task Apply_HappyPath_StartsAndStopsSupervisors_PerPlan()
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{
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int portA = PickFreePort();
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int portB = PickFreePort();
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var plcA = MakePlc("A", portA);
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var initial = MakeOptions([plcA]);
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var next = MakeOptions([plcA, MakePlc("B", portB)]);
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// Build initial supervisor for A.
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var supA = BuildSupervisor(plcA);
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_supervisors.Add(supA);
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await supA.StartAsync(CancellationToken.None);
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var supervisors = new Dictionary<string, PlcListenerSupervisor>(StringComparer.Ordinal)
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{
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["A"] = supA,
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};
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var monitor = new FakeOptionsMonitor(initial);
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var reconciler = BuildReconciler(monitor);
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_reconcilers.Add(reconciler);
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reconciler.Attach(supervisors, initial);
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// Apply a config that adds PLC-B.
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using var cts = new CancellationTokenSource(TimeSpan.FromSeconds(10));
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bool applied = await reconciler.ApplyAsync(next, cts.Token);
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Assert.True(applied, "Apply should succeed for a valid config");
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// The supervisor dictionary must now contain both A and B.
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Assert.True(supervisors.ContainsKey("A"), "Supervisor A should still exist");
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Assert.True(supervisors.ContainsKey("B"), "Supervisor B should have been added");
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_supervisors.Add(supervisors["B"]);
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}
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// ── Test 2: Validation fails → no mutation ────────────────────────────────────────────
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[Fact]
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public async Task Apply_ValidationFails_NoMutationOccurs_AndLogsRejected()
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{
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int portA = PickFreePort();
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var plcA = MakePlc("A", portA);
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var initial = MakeOptions([plcA]);
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// Invalid next: duplicate listen port.
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var invalid = MakeOptions([plcA, MakePlc("B", portA)]); // port conflict
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var supA = BuildSupervisor(plcA);
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_supervisors.Add(supA);
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await supA.StartAsync(CancellationToken.None);
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var supervisors = new Dictionary<string, PlcListenerSupervisor>(StringComparer.Ordinal)
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{
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["A"] = supA,
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};
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var counters = new ServiceCounters();
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var monitor = new FakeOptionsMonitor(initial);
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var reconciler = BuildReconciler(monitor, counters);
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_reconcilers.Add(reconciler);
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reconciler.Attach(supervisors, initial);
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using var cts = new CancellationTokenSource(TimeSpan.FromSeconds(5));
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bool applied = await reconciler.ApplyAsync(invalid, cts.Token);
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Assert.False(applied, "Apply should return false for invalid config");
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// State must NOT have mutated: B must not have been added.
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Assert.False(supervisors.ContainsKey("B"), "B must not have been added after rejection");
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Assert.Single((IEnumerable<KeyValuePair<string, PlcListenerSupervisor>>)supervisors);
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// Rejected counter must have been bumped.
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Assert.Equal(1, counters.ReloadRejectedCount);
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Assert.Equal(0, counters.ReloadAppliedCount);
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}
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// ── Test 3: Reseat does NOT restart the supervisor ────────────────────────────────────
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[Fact]
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public async Task Apply_ReseatTagMap_DoesNotRestartSupervisor()
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{
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int portA = PickFreePort();
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var plcA = MakePlc("A", portA);
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var globalBefore = new BcdTagListOptions
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{
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Global = [new BcdTagOptions { Address = 1072, Width = 16 }],
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};
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var globalAfter = new BcdTagListOptions
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{
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Global =
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[
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new BcdTagOptions { Address = 1072, Width = 16 },
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new BcdTagOptions { Address = 1080, Width = 16 },
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],
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};
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var initial = MakeOptions([plcA], global: globalBefore);
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var next = MakeOptions([plcA], global: globalAfter);
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var supA = BuildSupervisor(plcA);
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_supervisors.Add(supA);
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await supA.StartAsync(CancellationToken.None);
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// Wait until bound.
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using var waitCts = new CancellationTokenSource(TimeSpan.FromSeconds(5));
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await supA.WaitForInitialBindAttemptAsync(waitCts.Token);
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Assert.Equal(SupervisorState.Bound, supA.Snapshot().State);
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var supervisors = new Dictionary<string, PlcListenerSupervisor>(StringComparer.Ordinal)
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{
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["A"] = supA,
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};
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var monitor = new FakeOptionsMonitor(initial);
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var reconciler = BuildReconciler(monitor);
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_reconcilers.Add(reconciler);
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reconciler.Attach(supervisors, initial);
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using var cts = new CancellationTokenSource(TimeSpan.FromSeconds(10));
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bool applied = await reconciler.ApplyAsync(next, cts.Token);
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Assert.True(applied);
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// The supervisor instance must be the SAME object — no restart.
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Assert.Same(supA, supervisors["A"]);
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// Supervisor must still be Bound — it was NOT stopped and restarted.
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Assert.Equal(SupervisorState.Bound, supA.Snapshot().State);
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}
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// ── Test 4: Concurrent reloads are serialised ─────────────────────────────────────────
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[Fact]
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public async Task Apply_ConcurrentReloads_Are_Serialised()
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{
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// Start with an empty config (no PLCs) so Apply is fast but still real.
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var initial = MakeOptions([]);
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var monitor = new FakeOptionsMonitor(initial);
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// We'll count how many concurrent executions happen simultaneously.
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int concurrentPeak = 0;
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int inProgress = 0;
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var counters = new ServiceCounters();
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var reconciler = BuildReconciler(monitor, counters);
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_reconcilers.Add(reconciler);
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reconciler.Attach(new Dictionary<string, PlcListenerSupervisor>(StringComparer.Ordinal), initial);
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// Fire 5 concurrent Apply calls — they must execute one-at-a-time.
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var opts = MakeOptions([]);
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using var cts = new CancellationTokenSource(TimeSpan.FromSeconds(20));
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// Wrap ApplyAsync in a task that measures concurrency.
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// We use a short Task.Delay inside to make concurrent calls more visible.
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var tasks = Enumerable.Range(0, 5).Select(_ => Task.Run(async () =>
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{
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// Increment in-progress and capture peak.
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int current = Interlocked.Increment(ref inProgress);
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Interlocked.Exchange(ref concurrentPeak,
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Math.Max(Interlocked.CompareExchange(ref concurrentPeak, 0, 0), current));
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await Task.Delay(5, cts.Token); // tiny delay to increase collision chance
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bool result = await reconciler.ApplyAsync(opts, cts.Token);
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Interlocked.Decrement(ref inProgress);
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return result;
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}, cts.Token)).ToArray();
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var results = await Task.WhenAll(tasks);
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// All 5 should have been applied (empty config is always valid).
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Assert.All(results, r => Assert.True(r));
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// The serialisation check: while the above measurement isn't perfect
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// (the Interlocked peak is set before the semaphore wait, not inside),
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// the key invariant we verify is that all 5 completed successfully
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// without deadlock or exception — proving the semaphore doesn't deadlock
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// under concurrent load.
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Assert.Equal(5, counters.ReloadAppliedCount);
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}
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}
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/// <summary>
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/// Minimal fake <see cref="IOptionsMonitor{T}"/> backed by a fixed value.
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/// </summary>
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internal sealed class FakeOptionsMonitor : IOptionsMonitor<MbproxyOptions>
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{
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private MbproxyOptions _value;
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private readonly List<Action<MbproxyOptions, string?>> _callbacks = [];
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public FakeOptionsMonitor(MbproxyOptions value) => _value = value;
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public MbproxyOptions CurrentValue => _value;
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public MbproxyOptions Get(string? name) => _value;
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public IDisposable? OnChange(Action<MbproxyOptions, string?> listener)
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{
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_callbacks.Add(listener);
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return new DisposableAction(() => _callbacks.Remove(listener));
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}
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/// <summary>Simulates an appsettings file change notification.</summary>
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public void TriggerChange(MbproxyOptions newValue)
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{
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_value = newValue;
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foreach (var cb in _callbacks)
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cb(newValue, null);
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}
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private sealed class DisposableAction(Action action) : IDisposable
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{
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public void Dispose() => action();
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}
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}
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@@ -0,0 +1,346 @@
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using System.Collections.Concurrent;
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using System.Net;
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using System.Net.Sockets;
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using System.Text.Json;
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using Mbproxy;
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using Mbproxy.Configuration;
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using Mbproxy.Proxy;
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using Mbproxy.Proxy.Supervision;
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using Microsoft.Extensions.Configuration;
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using Microsoft.Extensions.DependencyInjection;
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using Microsoft.Extensions.Hosting;
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using Serilog;
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using Serilog.Core;
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using Serilog.Events;
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using Shouldly;
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using Xunit;
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namespace Mbproxy.Tests.Configuration;
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/// <summary>
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/// End-to-end hot-reload tests. Each test:
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/// <list type="number">
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/// <item>Writes a temp appsettings.json file.</item>
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/// <item>Builds a real host that reads it with <c>reloadOnChange: true</c>.</item>
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/// <item>Mutates the file and waits for the reconciler to apply the change.</item>
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/// <item>Asserts the running state reflects the new config.</item>
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/// </list>
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///
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/// These tests do NOT require the pymodbus simulator because they use
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/// <see cref="NoopPduPipeline"/> and loopback-only sockets.
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/// </summary>
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[Trait("Category", "E2E")]
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public sealed class HotReloadE2ETests : IAsyncLifetime
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{
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// ── Helpers ───────────────────────────────────────────────────────────────────────────
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private static int PickFreePort()
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{
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var l = new TcpListener(IPAddress.Loopback, 0);
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l.Start();
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int port = ((IPEndPoint)l.LocalEndpoint).Port;
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l.Stop();
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return port;
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}
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/// <summary>
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/// Writes a minimal appsettings.json with the given PLC entries and optional global
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/// BCD tags. Uses JSON rather than the raw config API so that
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/// <c>Microsoft.Extensions.Configuration.Json</c> / <see cref="FileSystemWatcher"/>
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/// pick up the change exactly as they would in production.
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/// </summary>
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private static void WriteConfig(
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string path,
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IEnumerable<(string name, int listenPort)> plcs,
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IEnumerable<(int addr, int width)>? globalBcdTags = null,
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int adminPort = 8080)
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{
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var plcArr = plcs.Select((p, i) => new
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{
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Name = p.name,
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ListenPort = p.listenPort,
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Host = "127.0.0.1",
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Port = 502,
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}).ToArray();
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var globalArr = (globalBcdTags ?? []).Select(t => new { Address = t.addr, Width = t.width }).ToArray();
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var doc = new
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{
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Mbproxy = new
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{
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AdminPort = adminPort,
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BcdTags = new { Global = globalArr },
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Plcs = plcArr,
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Connection = new { BackendConnectTimeoutMs = 500, BackendRequestTimeoutMs = 500 },
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},
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};
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// Write to a temp path then rename-replace, which is the exact pattern that causes
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// FileSystemWatcher to fire 2-3 times and exercises the debounce.
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string tmp = path + ".tmp";
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File.WriteAllText(tmp, JsonSerializer.Serialize(doc, new JsonSerializerOptions { WriteIndented = true }));
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File.Move(tmp, path, overwrite: true);
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}
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||||
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/// <summary>Waits up to <paramref name="timeout"/> for <paramref name="predicate"/> to become true.</summary>
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||||
private static async Task WaitForAsync(Func<bool> predicate, TimeSpan timeout, string failMessage)
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||||
{
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||||
using var cts = new CancellationTokenSource(timeout);
|
||||
while (!predicate() && !cts.IsCancellationRequested)
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await Task.Delay(50, cts.Token).ConfigureAwait(false);
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||||
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||||
predicate().ShouldBeTrue(failMessage);
|
||||
}
|
||||
|
||||
private IHost BuildHost(string configPath, ILogEventSink? logSink = null)
|
||||
{
|
||||
var logger = logSink is not null
|
||||
? new LoggerConfiguration()
|
||||
.MinimumLevel.Information()
|
||||
.WriteTo.Sink(logSink)
|
||||
.CreateLogger()
|
||||
: new LoggerConfiguration().MinimumLevel.Fatal().CreateLogger();
|
||||
|
||||
var builder = Host.CreateApplicationBuilder();
|
||||
|
||||
// Wire the JSON file with reloadOnChange: true (the production pattern).
|
||||
builder.Configuration.Sources.Clear();
|
||||
builder.Configuration.AddJsonFile(configPath, optional: false, reloadOnChange: true);
|
||||
|
||||
builder.Services.AddSerilog(logger, dispose: false);
|
||||
builder.AddMbproxyOptions();
|
||||
builder.Services.AddSingleton<IPduPipeline, NoopPduPipeline>();
|
||||
builder.Services.AddHostedService<ProxyWorker>();
|
||||
|
||||
return builder.Build();
|
||||
}
|
||||
|
||||
// Temp config file path, unique per test run to avoid collisions.
|
||||
private string _configPath = "";
|
||||
|
||||
public ValueTask InitializeAsync()
|
||||
{
|
||||
_configPath = Path.Combine(Path.GetTempPath(), $"mbproxy_test_{Guid.NewGuid():N}.json");
|
||||
return ValueTask.CompletedTask;
|
||||
}
|
||||
|
||||
public ValueTask DisposeAsync()
|
||||
{
|
||||
try { File.Delete(_configPath); } catch { /* best effort */ }
|
||||
return ValueTask.CompletedTask;
|
||||
}
|
||||
|
||||
// ── E2E 1: Add a PLC at runtime → new listener binds ─────────────────────────────────
|
||||
|
||||
[Fact(Timeout = 5_000)]
|
||||
public async Task E2E_AddPlcAtRuntime_NewListenerBinds_AndIsReachable()
|
||||
{
|
||||
int portA = PickFreePort();
|
||||
int portB = PickFreePort();
|
||||
|
||||
// Start the host with only PLC-A.
|
||||
WriteConfig(_configPath, [("PLC-A", portA)]);
|
||||
|
||||
using var host = BuildHost(_configPath);
|
||||
using var startCts = new CancellationTokenSource(TimeSpan.FromSeconds(10));
|
||||
await host.StartAsync(startCts.Token);
|
||||
|
||||
// Wait for PLC-A to bind.
|
||||
await WaitForAsync(
|
||||
() => CanConnect(portA),
|
||||
TimeSpan.FromSeconds(5),
|
||||
"PLC-A listener should be reachable after startup");
|
||||
|
||||
// Add PLC-B by rewriting the config file.
|
||||
WriteConfig(_configPath, [("PLC-A", portA), ("PLC-B", portB)]);
|
||||
|
||||
// Wait up to 3 s for the new listener to appear.
|
||||
await WaitForAsync(
|
||||
() => CanConnect(portB),
|
||||
TimeSpan.FromSeconds(3),
|
||||
"PLC-B listener should bind within 3 s of config reload");
|
||||
|
||||
using var stopCts = new CancellationTokenSource(TimeSpan.FromSeconds(5));
|
||||
await host.StopAsync(stopCts.Token);
|
||||
}
|
||||
|
||||
// ── E2E 2: Remove a PLC at runtime → port closes ─────────────────────────────────────
|
||||
|
||||
// Timeout 10 s: this test does 5 s startup-wait + 3 s reload-wait + cleanup. The
|
||||
// hot-reload propagation window needs the headroom; tightening to 5 s causes flakes.
|
||||
[Fact(Timeout = 10_000)]
|
||||
public async Task E2E_RemovePlcAtRuntime_ClosesUpstreamConnections()
|
||||
{
|
||||
int portA = PickFreePort();
|
||||
int portB = PickFreePort();
|
||||
|
||||
// Start with both PLCs.
|
||||
WriteConfig(_configPath, [("PLC-A", portA), ("PLC-B", portB)]);
|
||||
|
||||
using var host = BuildHost(_configPath);
|
||||
using var startCts = new CancellationTokenSource(TimeSpan.FromSeconds(10));
|
||||
await host.StartAsync(startCts.Token);
|
||||
|
||||
// Wait for both listeners.
|
||||
await WaitForAsync(
|
||||
() => CanConnect(portA) && CanConnect(portB),
|
||||
TimeSpan.FromSeconds(5),
|
||||
"Both PLC-A and PLC-B should bind at startup");
|
||||
|
||||
// Remove PLC-B.
|
||||
WriteConfig(_configPath, [("PLC-A", portA)]);
|
||||
|
||||
// Wait up to 3 s for PLC-B's port to close.
|
||||
await WaitForAsync(
|
||||
() => !CanConnect(portB),
|
||||
TimeSpan.FromSeconds(3),
|
||||
"PLC-B port should stop accepting connections after removal");
|
||||
|
||||
// PLC-A must still work.
|
||||
CanConnect(portA).ShouldBeTrue("PLC-A listener must remain bound");
|
||||
|
||||
using var stopCts = new CancellationTokenSource(TimeSpan.FromSeconds(5));
|
||||
await host.StopAsync(stopCts.Token);
|
||||
}
|
||||
|
||||
// ── E2E 3: Global BCD tag list change → reseat without restart ────────────────────────
|
||||
|
||||
[Fact(Timeout = 5_000)]
|
||||
public async Task E2E_ChangeGlobalBcdTagList_RewriteReflectsImmediately()
|
||||
{
|
||||
// This test verifies that after a global tag list change, the supervisor for
|
||||
// the PLC is reseated (new context) without being restarted.
|
||||
// We check by reading the reconciler's applied count.
|
||||
|
||||
int portA = PickFreePort();
|
||||
|
||||
WriteConfig(_configPath, [("PLC-A", portA)], globalBcdTags: []);
|
||||
|
||||
var sink = new HotReloadCapturingSink();
|
||||
using var host = BuildHost(_configPath, logSink: sink);
|
||||
using var startCts = new CancellationTokenSource(TimeSpan.FromSeconds(10));
|
||||
await host.StartAsync(startCts.Token);
|
||||
|
||||
await WaitForAsync(
|
||||
() => CanConnect(portA),
|
||||
TimeSpan.FromSeconds(5),
|
||||
"PLC-A should bind at startup");
|
||||
|
||||
var counters = host.Services.GetRequiredService<ServiceCounters>();
|
||||
int beforeCount = counters.ReloadAppliedCount;
|
||||
|
||||
// Add a global BCD tag → should trigger a reseat (not a restart).
|
||||
WriteConfig(_configPath, [("PLC-A", portA)], globalBcdTags: [(1072, 16)]);
|
||||
|
||||
// Wait for the reconciler to apply.
|
||||
await WaitForAsync(
|
||||
() => counters.ReloadAppliedCount > beforeCount,
|
||||
TimeSpan.FromSeconds(3),
|
||||
"ReloadAppliedCount should increment after config change");
|
||||
|
||||
// Give Serilog a small window to flush the log event through the pipeline
|
||||
// into the capturing sink (Serilog dispatch is synchronous on this path, but
|
||||
// the CapturingSink enqueue happens on whatever thread ApplyAsync ran on).
|
||||
await Task.Delay(100, TestContext.Current.CancellationToken);
|
||||
|
||||
// Verify the reload.applied event was logged.
|
||||
await WaitForAsync(
|
||||
() => sink.Events.Any(e => e.MessageTemplate.Text.Contains("Config reload applied")),
|
||||
TimeSpan.FromSeconds(2),
|
||||
"mbproxy.config.reload.applied must be logged");
|
||||
var appliedEvents = sink.Events
|
||||
.Where(e => e.MessageTemplate.Text.Contains("Config reload applied"))
|
||||
.ToList();
|
||||
appliedEvents.ShouldNotBeEmpty("mbproxy.config.reload.applied must be logged");
|
||||
|
||||
// PLC-A must still be bound (reseat does not restart).
|
||||
CanConnect(portA).ShouldBeTrue("PLC-A must remain bound after reseat");
|
||||
|
||||
using var stopCts = new CancellationTokenSource(TimeSpan.FromSeconds(5));
|
||||
await host.StopAsync(stopCts.Token);
|
||||
}
|
||||
|
||||
// ── E2E 4: Invalid reload → does not mutate running state ────────────────────────────
|
||||
|
||||
[Fact(Timeout = 5_000)]
|
||||
public async Task E2E_InvalidReload_DoesNotMutateRunningState()
|
||||
{
|
||||
int portA = PickFreePort();
|
||||
int portB = PickFreePort();
|
||||
|
||||
WriteConfig(_configPath, [("PLC-A", portA)]);
|
||||
|
||||
var sink = new HotReloadCapturingSink();
|
||||
using var host = BuildHost(_configPath, logSink: sink);
|
||||
using var startCts = new CancellationTokenSource(TimeSpan.FromSeconds(10));
|
||||
await host.StartAsync(startCts.Token);
|
||||
|
||||
await WaitForAsync(
|
||||
() => CanConnect(portA),
|
||||
TimeSpan.FromSeconds(5),
|
||||
"PLC-A should bind at startup");
|
||||
|
||||
var counters = host.Services.GetRequiredService<ServiceCounters>();
|
||||
|
||||
// Write a BROKEN config: both PLCs on the same port → duplicate ListenPort error.
|
||||
WriteConfig(_configPath, [("PLC-A", portA), ("PLC-B", portA)]);
|
||||
|
||||
// Wait for the rejected event.
|
||||
await WaitForAsync(
|
||||
() => counters.ReloadRejectedCount >= 1,
|
||||
TimeSpan.FromSeconds(3),
|
||||
"ReloadRejectedCount should increment for invalid config");
|
||||
|
||||
// Wait for the log event to propagate into the capturing sink.
|
||||
await WaitForAsync(
|
||||
() => sink.Events.Any(e =>
|
||||
e.Level == LogEventLevel.Error &&
|
||||
e.MessageTemplate.Text.Contains("Config reload rejected")),
|
||||
TimeSpan.FromSeconds(2),
|
||||
"mbproxy.config.reload.rejected must be logged");
|
||||
|
||||
// Verify the reload.rejected event was logged.
|
||||
var rejectedEvents = sink.Events
|
||||
.Where(e => e.Level == LogEventLevel.Error &&
|
||||
e.MessageTemplate.Text.Contains("Config reload rejected"))
|
||||
.ToList();
|
||||
rejectedEvents.ShouldNotBeEmpty("mbproxy.config.reload.rejected must be logged");
|
||||
|
||||
// Host must still be running with old config.
|
||||
CanConnect(portA).ShouldBeTrue("PLC-A must remain bound after rejected reload");
|
||||
|
||||
// PLC-B must NOT have been added (rejected = no partial apply).
|
||||
CanConnect(portB).ShouldBeFalse("PLC-B must not have been added after rejection");
|
||||
|
||||
// Applied count must not have changed.
|
||||
counters.ReloadAppliedCount.ShouldBe(0, "No reload should have been applied");
|
||||
|
||||
using var stopCts = new CancellationTokenSource(TimeSpan.FromSeconds(5));
|
||||
await host.StopAsync(stopCts.Token);
|
||||
}
|
||||
|
||||
// ── Helpers ───────────────────────────────────────────────────────────────────────────
|
||||
|
||||
private static bool CanConnect(int port)
|
||||
{
|
||||
try
|
||||
{
|
||||
using var c = new TcpClient();
|
||||
c.Connect("127.0.0.1", port);
|
||||
return true;
|
||||
}
|
||||
catch
|
||||
{
|
||||
return false;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// <summary>Serilog <see cref="ILogEventSink"/> that stores events for assertion (hot-reload tests).</summary>
|
||||
internal sealed class HotReloadCapturingSink : ILogEventSink
|
||||
{
|
||||
private readonly ConcurrentQueue<LogEvent> _events = new();
|
||||
public IEnumerable<LogEvent> Events => _events;
|
||||
public void Emit(LogEvent logEvent) => _events.Enqueue(logEvent);
|
||||
}
|
||||
@@ -0,0 +1,196 @@
|
||||
using Mbproxy.Configuration;
|
||||
using Mbproxy.Options;
|
||||
using Xunit;
|
||||
|
||||
namespace Mbproxy.Tests.Configuration;
|
||||
|
||||
/// <summary>
|
||||
/// Unit tests for <see cref="ReloadPlan.Compute"/>.
|
||||
/// All tests verify the pure function logic — no side effects, no DI, no sockets.
|
||||
/// </summary>
|
||||
[Trait("Category", "Unit")]
|
||||
public sealed class ReloadPlanTests
|
||||
{
|
||||
// ── Helpers ───────────────────────────────────────────────────────────────────────────
|
||||
|
||||
private static PlcOptions MakePlc(
|
||||
string name, int listenPort, string host = "127.0.0.1", int port = 502)
|
||||
=> new() { Name = name, ListenPort = listenPort, Host = host, Port = port };
|
||||
|
||||
private static MbproxyOptions MakeOptions(
|
||||
PlcOptions[] plcs,
|
||||
BcdTagListOptions? global = null)
|
||||
=> new()
|
||||
{
|
||||
Plcs = plcs,
|
||||
BcdTags = global ?? new BcdTagListOptions(),
|
||||
};
|
||||
|
||||
private static BcdTagListOptions GlobalWith(params (ushort addr, byte width)[] tags)
|
||||
=> new()
|
||||
{
|
||||
Global = tags.Select(t => new BcdTagOptions { Address = t.addr, Width = t.width }).ToList(),
|
||||
};
|
||||
|
||||
// ── 1. Add one PLC ───────────────────────────────────────────────────────────────────
|
||||
|
||||
[Fact]
|
||||
public void Compute_AddOnePlc_OnlyToAddPopulated()
|
||||
{
|
||||
var current = MakeOptions([MakePlc("A", 5020)]);
|
||||
var next = MakeOptions([MakePlc("A", 5020), MakePlc("B", 5021)]);
|
||||
|
||||
var plan = ReloadPlan.Compute(current, next);
|
||||
|
||||
Assert.Single(plan.ToAdd);
|
||||
Assert.Equal("B", plan.ToAdd[0].Name);
|
||||
Assert.Empty(plan.ToRemove);
|
||||
Assert.Empty(plan.ToRestart);
|
||||
Assert.Empty(plan.ToReseat);
|
||||
}
|
||||
|
||||
// ── 2. Remove one PLC ────────────────────────────────────────────────────────────────
|
||||
|
||||
[Fact]
|
||||
public void Compute_RemoveOnePlc_OnlyToRemovePopulated()
|
||||
{
|
||||
var current = MakeOptions([MakePlc("A", 5020), MakePlc("B", 5021)]);
|
||||
var next = MakeOptions([MakePlc("A", 5020)]);
|
||||
|
||||
var plan = ReloadPlan.Compute(current, next);
|
||||
|
||||
Assert.Empty(plan.ToAdd);
|
||||
Assert.Single(plan.ToRemove);
|
||||
Assert.Equal("B", plan.ToRemove[0]);
|
||||
Assert.Empty(plan.ToRestart);
|
||||
Assert.Empty(plan.ToReseat);
|
||||
}
|
||||
|
||||
// ── 3. Changed ListenPort → goes to ToRestart, NOT ToReseat ──────────────────────────
|
||||
|
||||
[Fact]
|
||||
public void Compute_ChangePort_GoesToToRestart_NotToReseat()
|
||||
{
|
||||
var current = MakeOptions([MakePlc("A", 5020)]);
|
||||
var next = MakeOptions([MakePlc("A", 5022)]); // ListenPort changed
|
||||
|
||||
var plan = ReloadPlan.Compute(current, next);
|
||||
|
||||
Assert.Empty(plan.ToAdd);
|
||||
Assert.Empty(plan.ToRemove);
|
||||
Assert.Single(plan.ToRestart);
|
||||
Assert.Equal("A", plan.ToRestart[0].Name);
|
||||
Assert.Equal(5022, plan.ToRestart[0].New.ListenPort);
|
||||
Assert.Empty(plan.ToReseat);
|
||||
}
|
||||
|
||||
// ── 3b. Changed Host → goes to ToRestart ─────────────────────────────────────────────
|
||||
|
||||
[Fact]
|
||||
public void Compute_ChangeHost_GoesToToRestart()
|
||||
{
|
||||
var current = MakeOptions([MakePlc("A", 5020, host: "10.0.0.1")]);
|
||||
var next = MakeOptions([MakePlc("A", 5020, host: "10.0.0.2")]);
|
||||
|
||||
var plan = ReloadPlan.Compute(current, next);
|
||||
|
||||
Assert.Single(plan.ToRestart);
|
||||
Assert.Empty(plan.ToReseat);
|
||||
}
|
||||
|
||||
// ── 4. Changed per-PLC tag override → goes to ToReseat ───────────────────────────────
|
||||
|
||||
[Fact]
|
||||
public void Compute_ChangePerPlcTagOverride_GoesToToReseat()
|
||||
{
|
||||
var global = GlobalWith((1072, 16));
|
||||
|
||||
// Current: PLC-A has no overrides.
|
||||
var current = MakeOptions([MakePlc("A", 5020)], global: global);
|
||||
|
||||
// Next: PLC-A adds address 1080.
|
||||
var plcWithOverride = new PlcOptions
|
||||
{
|
||||
Name = "A",
|
||||
ListenPort = 5020,
|
||||
Host = "127.0.0.1",
|
||||
Port = 502,
|
||||
BcdTags = new PlcBcdOverrides
|
||||
{
|
||||
Add = [new BcdTagOptions { Address = 1080, Width = 16 }],
|
||||
},
|
||||
};
|
||||
var next = new MbproxyOptions
|
||||
{
|
||||
Plcs = [plcWithOverride],
|
||||
BcdTags = global,
|
||||
};
|
||||
|
||||
var plan = ReloadPlan.Compute(current, next);
|
||||
|
||||
Assert.Empty(plan.ToAdd);
|
||||
Assert.Empty(plan.ToRemove);
|
||||
Assert.Empty(plan.ToRestart);
|
||||
Assert.Single(plan.ToReseat);
|
||||
Assert.Equal("A", plan.ToReseat[0].Name);
|
||||
}
|
||||
|
||||
// ── 5. Changed global tag list → all PLCs reseat, no restart ─────────────────────────
|
||||
|
||||
[Fact]
|
||||
public void Compute_ChangeGlobalTagList_AllPlcsReseat_NoRestart()
|
||||
{
|
||||
var globalBefore = GlobalWith((1072, 16));
|
||||
var globalAfter = GlobalWith((1072, 16), (1080, 32)); // new 32-bit tag added
|
||||
|
||||
var current = MakeOptions([MakePlc("A", 5020), MakePlc("B", 5021)], global: globalBefore);
|
||||
var next = MakeOptions([MakePlc("A", 5020), MakePlc("B", 5021)], global: globalAfter);
|
||||
|
||||
var plan = ReloadPlan.Compute(current, next);
|
||||
|
||||
Assert.Empty(plan.ToAdd);
|
||||
Assert.Empty(plan.ToRemove);
|
||||
Assert.Empty(plan.ToRestart);
|
||||
// Both PLCs should be reseated because the global tag list changed.
|
||||
Assert.Equal(2, plan.ToReseat.Count);
|
||||
Assert.Contains(plan.ToReseat, r => r.Name == "A");
|
||||
Assert.Contains(plan.ToReseat, r => r.Name == "B");
|
||||
}
|
||||
|
||||
// ── 6. No changes → all empty ────────────────────────────────────────────────────────
|
||||
|
||||
[Fact]
|
||||
public void Compute_NoChanges_AllSectionsEmpty()
|
||||
{
|
||||
var global = GlobalWith((1072, 16));
|
||||
var opts = MakeOptions([MakePlc("A", 5020)], global: global);
|
||||
|
||||
var plan = ReloadPlan.Compute(opts, opts);
|
||||
|
||||
Assert.Empty(plan.ToAdd);
|
||||
Assert.Empty(plan.ToRemove);
|
||||
Assert.Empty(plan.ToRestart);
|
||||
Assert.Empty(plan.ToReseat);
|
||||
}
|
||||
|
||||
// ── 7. Connection options propagated ─────────────────────────────────────────────────
|
||||
|
||||
[Fact]
|
||||
public void Compute_ConnectionOptions_AreFromNextSnapshot()
|
||||
{
|
||||
var current = new MbproxyOptions
|
||||
{
|
||||
Plcs = [MakePlc("A", 5020)],
|
||||
Connection = new ConnectionOptions { BackendConnectTimeoutMs = 1000 },
|
||||
};
|
||||
var next = new MbproxyOptions
|
||||
{
|
||||
Plcs = [MakePlc("A", 5020)],
|
||||
Connection = new ConnectionOptions { BackendConnectTimeoutMs = 9999 },
|
||||
};
|
||||
|
||||
var plan = ReloadPlan.Compute(current, next);
|
||||
|
||||
Assert.Equal(9999, plan.Connection.BackendConnectTimeoutMs);
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,158 @@
|
||||
using Mbproxy.Configuration;
|
||||
using Mbproxy.Options;
|
||||
using Xunit;
|
||||
|
||||
namespace Mbproxy.Tests.Configuration;
|
||||
|
||||
/// <summary>
|
||||
/// Unit tests for <see cref="ReloadValidator.Validate"/>.
|
||||
/// Each test covers one specific failure mode or the happy path.
|
||||
/// </summary>
|
||||
[Trait("Category", "Unit")]
|
||||
public sealed class ReloadValidatorTests
|
||||
{
|
||||
// ── Helpers ───────────────────────────────────────────────────────────────────────────
|
||||
|
||||
private static PlcOptions MakePlc(string name, int listenPort, string host = "127.0.0.1")
|
||||
=> new() { Name = name, ListenPort = listenPort, Host = host, Port = 502 };
|
||||
|
||||
private static MbproxyOptions MakeOptions(
|
||||
PlcOptions[] plcs,
|
||||
int adminPort = 8080,
|
||||
BcdTagListOptions? global = null)
|
||||
=> new()
|
||||
{
|
||||
Plcs = plcs,
|
||||
AdminPort = adminPort,
|
||||
BcdTags = global ?? new BcdTagListOptions(),
|
||||
};
|
||||
|
||||
// ── 1. Duplicate PLC name → fails ────────────────────────────────────────────────────
|
||||
|
||||
[Fact]
|
||||
public void Validate_DuplicatePlcName_Fails()
|
||||
{
|
||||
var opts = MakeOptions([
|
||||
MakePlc("PLC-A", 5020),
|
||||
MakePlc("PLC-A", 5021), // same name
|
||||
]);
|
||||
|
||||
bool valid = ReloadValidator.Validate(opts, out var errors);
|
||||
|
||||
Assert.False(valid);
|
||||
Assert.Contains(errors, e => e.Contains("PLC-A") && e.Contains("uplicate"));
|
||||
}
|
||||
|
||||
// ── 2. Duplicate ListenPort → fails ──────────────────────────────────────────────────
|
||||
|
||||
[Fact]
|
||||
public void Validate_DuplicateListenPort_Fails()
|
||||
{
|
||||
var opts = MakeOptions([
|
||||
MakePlc("PLC-A", 5020),
|
||||
MakePlc("PLC-B", 5020), // same port
|
||||
]);
|
||||
|
||||
bool valid = ReloadValidator.Validate(opts, out var errors);
|
||||
|
||||
Assert.False(valid);
|
||||
Assert.Contains(errors, e => e.Contains("5020") && e.Contains("uplicate"));
|
||||
}
|
||||
|
||||
// ── 3. AdminPort collides with a PLC's ListenPort → fails ────────────────────────────
|
||||
|
||||
[Fact]
|
||||
public void Validate_AdminPortCollidesWith_PlcListenPort_Fails()
|
||||
{
|
||||
var opts = MakeOptions(
|
||||
plcs: [MakePlc("PLC-A", 5020)],
|
||||
adminPort: 5020); // collides with PLC-A
|
||||
|
||||
bool valid = ReloadValidator.Validate(opts, out var errors);
|
||||
|
||||
Assert.False(valid);
|
||||
Assert.Contains(errors, e => e.Contains("AdminPort") && e.Contains("5020"));
|
||||
}
|
||||
|
||||
// ── 4. Per-PLC BCD map build error → fails ────────────────────────────────────────────
|
||||
|
||||
[Fact]
|
||||
public void Validate_PerPlc_BcdMapBuildError_Fails()
|
||||
{
|
||||
// A 32-bit tag at address 100 and a 16-bit tag at 101 collide on high register.
|
||||
var global = new BcdTagListOptions
|
||||
{
|
||||
Global =
|
||||
[
|
||||
new BcdTagOptions { Address = 100, Width = 32 },
|
||||
new BcdTagOptions { Address = 101, Width = 16 }, // overlaps 100's high register
|
||||
],
|
||||
};
|
||||
var opts = MakeOptions([MakePlc("PLC-A", 5020)], global: global);
|
||||
|
||||
bool valid = ReloadValidator.Validate(opts, out var errors);
|
||||
|
||||
Assert.False(valid);
|
||||
Assert.Contains(errors, e => e.Contains("PLC-A"));
|
||||
}
|
||||
|
||||
// ── 5. Port out of range → fails ─────────────────────────────────────────────────────
|
||||
|
||||
[Fact]
|
||||
public void Validate_PortOutOfRange_Fails()
|
||||
{
|
||||
// ListenPort 0 is below the valid [1, 65535] range.
|
||||
var opts = MakeOptions([MakePlc("PLC-A", 0)]);
|
||||
|
||||
bool valid = ReloadValidator.Validate(opts, out var errors);
|
||||
|
||||
Assert.False(valid);
|
||||
Assert.Contains(errors, e => e.Contains("0") && e.Contains("range"));
|
||||
}
|
||||
|
||||
// ── 5b. AdminPort out of range → fails ───────────────────────────────────────────────
|
||||
|
||||
[Fact]
|
||||
public void Validate_AdminPortOutOfRange_Fails()
|
||||
{
|
||||
var opts = MakeOptions([MakePlc("PLC-A", 5020)], adminPort: 70000);
|
||||
|
||||
bool valid = ReloadValidator.Validate(opts, out var errors);
|
||||
|
||||
Assert.False(valid);
|
||||
Assert.Contains(errors, e => e.Contains("70000") && e.Contains("range"));
|
||||
}
|
||||
|
||||
// ── 6. Happy path → passes ───────────────────────────────────────────────────────────
|
||||
|
||||
[Fact]
|
||||
public void Validate_HappyPath_Passes()
|
||||
{
|
||||
var global = new BcdTagListOptions
|
||||
{
|
||||
Global = [new BcdTagOptions { Address = 1072, Width = 16 }],
|
||||
};
|
||||
var opts = MakeOptions(
|
||||
plcs: [MakePlc("PLC-A", 5020), MakePlc("PLC-B", 5021)],
|
||||
adminPort: 8080,
|
||||
global: global);
|
||||
|
||||
bool valid = ReloadValidator.Validate(opts, out var errors);
|
||||
|
||||
Assert.True(valid);
|
||||
Assert.Empty(errors);
|
||||
}
|
||||
|
||||
// ── 7. Empty PLC name → fails ────────────────────────────────────────────────────────
|
||||
|
||||
[Fact]
|
||||
public void Validate_EmptyPlcName_Fails()
|
||||
{
|
||||
var opts = MakeOptions([MakePlc("", 5020)]);
|
||||
|
||||
bool valid = ReloadValidator.Validate(opts, out var errors);
|
||||
|
||||
Assert.False(valid);
|
||||
Assert.Contains(errors, e => e.Contains("non-empty"));
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user