Joseph Doherty
87 lines
3.6 KiB
C#
87 lines
3.6 KiB
C#
using Shouldly;
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using Xunit;
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using ZB.MOM.WW.OtOpcUa.Core.Abstractions;
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using ZB.MOM.WW.OtOpcUa.Driver.FOCAS;
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namespace ZB.MOM.WW.OtOpcUa.Driver.FOCAS.Tests;
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/// <summary>
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/// 05/STAB-8 — a dead FOCAS CNC must not pay a full two-socket reconnect on every tick of each
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/// read / probe / fixed-tree / recycle loop. The per-device <see cref="ConnectionBackoff"/>
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/// gates the connect path; the probe bypasses it and a successful connect resets it. No FOCAS
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/// fixture exists — the fake-client suite is authoritative.
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/// </summary>
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[Trait("Category", "Unit")]
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public sealed class FocasConnectBackoffTests
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{
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private static FocasDriverOptions Options(bool probeEnabled) => new()
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{
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Devices = [new FocasDeviceOptions("focas://10.0.0.5:8193")],
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Tags = [new FocasTagDefinition("R", "focas://10.0.0.5:8193", "R100", FocasDataType.Byte)],
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Probe = new FocasProbeOptions
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{
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Enabled = probeEnabled,
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Interval = TimeSpan.FromMilliseconds(50),
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Timeout = TimeSpan.FromMilliseconds(250),
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},
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// FixedTree / HandleRecycle / AlarmProjection default off — keep only the data path (+ probe).
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};
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/// <summary>Rapid data calls against a dead CNC attempt a single connect, then fail fast inside the backoff window.</summary>
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[Fact]
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public async Task DeadDevice_ConnectAttemptsFollowBackoffSchedule()
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{
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var factory = new FakeFocasClientFactory
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{
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Customise = () => new FakeFocasClient
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{
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ThrowOnConnect = true,
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Exception = new InvalidOperationException("cnc down"),
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},
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};
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var drv = new FocasDriver(Options(probeEnabled: false), "focas-1", factory);
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await drv.InitializeAsync("{}", CancellationToken.None);
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for (var i = 0; i < 6; i++)
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await drv.ReadAsync(["R"], CancellationToken.None);
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// One real connect attempt; the remaining five fail fast inside the window — no new socket
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// is created (the fake factory records one client per attempted connect).
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factory.Clients.Count.ShouldBe(1);
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}
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/// <summary>The probe bypasses the backoff window and a successful connect resets it so the next data call succeeds immediately.</summary>
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[Fact]
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public async Task ProbeBypassesBackoff_AndSuccessResets()
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{
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var fail = true;
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var factory = new FakeFocasClientFactory
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{
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Customise = () => new FakeFocasClient
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{
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ThrowOnConnect = fail,
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Exception = new InvalidOperationException("cnc down"),
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},
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};
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var drv = new FocasDriver(Options(probeEnabled: true), "focas-1", factory);
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await drv.InitializeAsync("{}", CancellationToken.None);
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var down = await drv.ReadAsync(["R"], CancellationToken.None);
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down[0].StatusCode.ShouldBe(FocasStatusMapper.BadCommunicationError);
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// Device recovers. The probe bypasses the still-open window, reconnects, and resets it so
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// the following data read succeeds with no residual delay.
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fail = false;
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var deadline = DateTime.UtcNow + TimeSpan.FromSeconds(3);
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DataValueSnapshot? good = null;
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while (DateTime.UtcNow < deadline)
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{
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var r = await drv.ReadAsync(["R"], CancellationToken.None);
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if (r[0].StatusCode == FocasStatusMapper.Good) { good = r[0]; break; }
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await Task.Delay(25, CancellationToken.None);
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}
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good.ShouldNotBeNull("probe-driven reconnect must reset the backoff so data reads recover");
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}
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}
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