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
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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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