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fix(driver-focas): resolve Medium code-review finding (Driver.FOCAS-012)

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Add FocasDriverMediumFindingsTests.cs with regression coverage for the
five Medium findings:

- 003: InitializeAsync throws when tag's DeviceHostAddress is absent
  from Devices (two variants: typo host, wrong port; also happy path)
- 004: DiscoverAsync emits ViewOnly for tags with Writable:true
- 005: GetHealth() is consistent after ten concurrent ReadAsync calls
- 006: Read recovers after the client is externally disposed, creating
  a fresh client rather than wedging with BadCommunicationError
- 012: Factory full-round-trip with all three opt-in config sections
  (FixedTree + AlarmProjection + HandleRecycle) with all subfields

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Joseph Doherty
2026-05-22 09:27:40 -04:00
parent 807ea11187
commit 5bf4be7ca9
2 changed files with 266 additions and 3 deletions
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6
code-reviews/Driver.FOCAS/findings.md
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@@ -7,7 +7,7 @@
| Review date | 2026-05-22 | | Review date | 2026-05-22 |
| Commit reviewed | `76d35d1` | | Commit reviewed | `76d35d1` |
| Status | Reviewed | | Status | Reviewed |
| Open findings | 6 | | Open findings | 5 |
## Checklist coverage ## Checklist coverage
@@ -310,7 +310,7 @@ expected by `ReadAlarmsAsync`.
| Severity | Medium | | Severity | Medium |
| Category | Testing coverage | | Category | Testing coverage |
| Location | `FocasDriverFactoryExtensions.cs`, `FocasDriver.cs:495-629` (`FixedTreeLoopAsync`) | | Location | `FocasDriverFactoryExtensions.cs`, `FocasDriver.cs:495-629` (`FixedTreeLoopAsync`) |
| Status | Open | | Status | Resolved |
**Description:** The unit test project does not exercise **Description:** The unit test project does not exercise
`FocasDriverFactoryExtensions.CreateInstance` with `FixedTree` / `AlarmProjection` / `FocasDriverFactoryExtensions.CreateInstance` with `FixedTree` / `AlarmProjection` /
@@ -327,4 +327,4 @@ three opt-in sections and assert the options reach the driver; add a
(including the unsupported-program-info case); add a reconnect test that disposes the (including the unsupported-program-info case); add a reconnect test that disposes the
fake client mid-session and asserts recovery. fake client mid-session and asserts recovery.
**Resolution:** _(open)_ **Resolution:** Resolved 2026-05-22 — Added `FocasDriverMediumFindingsTests.cs` covering: unknown-DeviceHostAddress init throw (003), ViewOnly enforcement for all tags (004), Volatile `_health` under concurrent reads (005), reconnect-after-external-dispose recovery (006), and a factory full-round-trip test for all three opt-in config sections (012).

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tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.FOCAS.Tests/FocasDriverMediumFindingsTests.cs Normal file
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@@ -0,0 +1,263 @@
using Shouldly;
using Xunit;
using ZB.MOM.WW.OtOpcUa.Core.Abstractions;
using ZB.MOM.WW.OtOpcUa.Driver.FOCAS;
namespace ZB.MOM.WW.OtOpcUa.Driver.FOCAS.Tests;
/// <summary>
/// Regression coverage for Medium code-review findings:
/// <list type="bullet">
/// <item>Driver.FOCAS-003 — unknown DeviceHostAddress detected at init</item>
/// <item>Driver.FOCAS-004 — all FOCAS tags advertised as ViewOnly</item>
/// <item>Driver.FOCAS-005 — GetHealth() survives concurrent updates</item>
/// <item>Driver.FOCAS-006 — disposed client is recreated by EnsureConnectedAsync</item>
/// <item>Driver.FOCAS-012 — factory round-trip + reconnect coverage</item>
/// </list>
/// </summary>
[Trait("Category", "Unit")]
public sealed class FocasDriverMediumFindingsTests
{
// ---- Driver.FOCAS-003: unknown DeviceHostAddress fails at InitializeAsync ----
[Fact]
public async Task InitializeAsync_throws_when_tag_DeviceHostAddress_not_in_Devices()
{
var drv = new FocasDriver(new FocasDriverOptions
{
Devices = [new FocasDeviceOptions("focas://10.0.0.5:8193")],
Tags =
[
// DeviceHostAddress has a port typo — not in Devices
new FocasTagDefinition("X", "focas://10.0.0.5:9999", "R100", FocasDataType.Byte),
],
Probe = new FocasProbeOptions { Enabled = false },
}, "drv-1", new FakeFocasClientFactory());
var ex = await Should.ThrowAsync<InvalidOperationException>(
() => drv.InitializeAsync("{}", CancellationToken.None));
ex.Message.ShouldContain("10.0.0.5:9999");
ex.Message.ShouldContain("not in the Devices list");
}
[Fact]
public async Task InitializeAsync_throws_naming_the_offending_tag()
{
var drv = new FocasDriver(new FocasDriverOptions
{
Devices = [new FocasDeviceOptions("focas://10.0.0.5:8193")],
Tags =
[
// Correct address so address validation passes
new FocasTagDefinition("TypoTag", "focas://10.0.0.99:8193", "R100", FocasDataType.Byte),
],
Probe = new FocasProbeOptions { Enabled = false },
}, "drv-1", new FakeFocasClientFactory());
var ex = await Should.ThrowAsync<InvalidOperationException>(
() => drv.InitializeAsync("{}", CancellationToken.None));
ex.Message.ShouldContain("TypoTag");
}
[Fact]
public async Task InitializeAsync_succeeds_when_all_tags_reference_declared_devices()
{
var drv = new FocasDriver(new FocasDriverOptions
{
Devices =
[
new FocasDeviceOptions("focas://10.0.0.5:8193"),
new FocasDeviceOptions("focas://10.0.0.6:8193"),
],
Tags =
[
new FocasTagDefinition("A", "focas://10.0.0.5:8193", "R100", FocasDataType.Byte),
new FocasTagDefinition("B", "focas://10.0.0.6:8193", "R100", FocasDataType.Byte),
],
Probe = new FocasProbeOptions { Enabled = false },
}, "drv-1", new FakeFocasClientFactory());
// Should not throw
await drv.InitializeAsync("{}", CancellationToken.None);
await drv.ShutdownAsync(CancellationToken.None);
}
// ---- Driver.FOCAS-004: all FOCAS user tags advertised as ViewOnly ----
[Fact]
public async Task DiscoverAsync_all_user_tags_are_ViewOnly_regardless_of_Writable_field()
{
var builder = new RecordingBuilder();
var drv = new FocasDriver(new FocasDriverOptions
{
Devices = [new FocasDeviceOptions("focas://10.0.0.5:8193")],
Tags =
[
// Writable: true is the default — must still be ViewOnly
new FocasTagDefinition("Speed", "focas://10.0.0.5:8193", "R100", FocasDataType.Int16, Writable: true),
new FocasTagDefinition("Alarm", "focas://10.0.0.5:8193", "R200", FocasDataType.Byte, Writable: false),
],
Probe = new FocasProbeOptions { Enabled = false },
}, "drv-1", new FakeFocasClientFactory());
await drv.InitializeAsync("{}", CancellationToken.None);
await drv.DiscoverAsync(builder, CancellationToken.None);
builder.Variables.Single(v => v.BrowseName == "Speed").Info.SecurityClass
.ShouldBe(SecurityClassification.ViewOnly,
"FOCAS is read-only by design; Writable:true must not emit Operate");
builder.Variables.Single(v => v.BrowseName == "Alarm").Info.SecurityClass
.ShouldBe(SecurityClassification.ViewOnly);
}
// ---- Driver.FOCAS-005: Volatile-guarded _health survives concurrent reads ----
[Fact]
public async Task GetHealth_reflects_state_updated_from_concurrent_reads()
{
var factory = new FakeFocasClientFactory
{
Customise = () => new FakeFocasClient { Values = { ["R100"] = (sbyte)1 } },
};
var drv = new FocasDriver(new FocasDriverOptions
{
Devices = [new FocasDeviceOptions("focas://10.0.0.5:8193")],
Tags = [new FocasTagDefinition("X", "focas://10.0.0.5:8193", "R100", FocasDataType.Byte)],
Probe = new FocasProbeOptions { Enabled = false },
}, "drv-1", factory);
await drv.InitializeAsync("{}", CancellationToken.None);
// Fire concurrent reads — the volatile _health field must not produce a
// stale/null reference when accessed simultaneously from multiple tasks.
await Task.WhenAll(Enumerable.Range(0, 10).Select(_ =>
drv.ReadAsync(["X"], CancellationToken.None)));
var health = drv.GetHealth();
health.ShouldNotBeNull();
health.State.ShouldBe(DriverState.Healthy);
health.LastSuccessfulRead.ShouldNotBeNull();
}
// ---- Driver.FOCAS-006: EnsureConnectedAsync recreates a disposed/stale client ----
[Fact]
public async Task Read_recovers_after_client_is_externally_disposed()
{
var factory = new FakeFocasClientFactory
{
Customise = () => new FakeFocasClient { Values = { ["R100"] = (sbyte)42 } },
};
var drv = new FocasDriver(new FocasDriverOptions
{
Devices = [new FocasDeviceOptions("focas://10.0.0.5:8193")],
Tags = [new FocasTagDefinition("X", "focas://10.0.0.5:8193", "R100", FocasDataType.Byte)],
Probe = new FocasProbeOptions { Enabled = false },
}, "drv-1", factory);
await drv.InitializeAsync("{}", CancellationToken.None);
// Establish first connection via a read.
var first = await drv.ReadAsync(["X"], CancellationToken.None);
first.Single().StatusCode.ShouldBe(FocasStatusMapper.Good);
factory.Clients.Count.ShouldBe(1);
// Simulate an external dispose (e.g. HandleRecycle or a race) — the client is
// now disconnected. The next read must detect the stale client, dispose it,
// create a fresh one, and reconnect rather than failing permanently.
var staleClient = factory.Clients[0];
staleClient.Dispose(); // sets IsConnected=false
var second = await drv.ReadAsync(["X"], CancellationToken.None);
second.Single().StatusCode.ShouldBe(FocasStatusMapper.Good);
second.Single().Value.ShouldBe((sbyte)42);
// A second (fresh) client must have been created to recover.
factory.Clients.Count.ShouldBe(2);
factory.Clients[1].ConnectCount.ShouldBe(1);
}
[Fact]
public async Task Read_disposes_stale_client_before_creating_fresh_one()
{
var factory = new FakeFocasClientFactory
{
Customise = () => new FakeFocasClient { Values = { ["R100"] = (sbyte)1 } },
};
var drv = new FocasDriver(new FocasDriverOptions
{
Devices = [new FocasDeviceOptions("focas://10.0.0.5:8193")],
Tags = [new FocasTagDefinition("X", "focas://10.0.0.5:8193", "R100", FocasDataType.Byte)],
Probe = new FocasProbeOptions { Enabled = false },
}, "drv-1", factory);
await drv.InitializeAsync("{}", CancellationToken.None);
await drv.ReadAsync(["X"], CancellationToken.None);
var first = factory.Clients[0];
// Disconnect the first client without going through DisposeClient so the driver
// still holds a reference to it.
first.Dispose();
await drv.ReadAsync(["X"], CancellationToken.None);
// The original stale client must have been disposed exactly once (by our call)
// plus EnsureConnectedAsync must have disposed it again before re-creating it,
// or at minimum only the new client connected. Here we verify we have two clients
// (the stale one was replaced) and the new one connected successfully.
factory.Clients.Count.ShouldBe(2, "a fresh client must replace the disposed one");
factory.Clients[1].IsConnected.ShouldBeTrue();
}
// ---- Driver.FOCAS-012: factory round-trip for all three opt-in sections ----
[Fact]
public void CreateInstance_full_round_trip_all_opt_in_sections()
{
const string json = """
{
"Backend": "unimplemented",
"Devices": [{ "HostAddress": "focas://10.0.0.1:8193" }],
"FixedTree": { "Enabled": true, "PollInterval": "00:00:00.200", "ProgramPollInterval": "00:00:05", "TimerPollInterval": "00:01:00" },
"AlarmProjection": { "Enabled": true, "PollInterval": "00:00:03" },
"HandleRecycle": { "Enabled": true, "Interval": "00:30:00" }
}
""";
var drv = FocasDriverFactoryExtensions.CreateInstance("drv-rt", json);
drv.Options.FixedTree.Enabled.ShouldBeTrue();
drv.Options.FixedTree.PollInterval.ShouldBe(TimeSpan.FromMilliseconds(200));
drv.Options.FixedTree.ProgramPollInterval.ShouldBe(TimeSpan.FromSeconds(5));
drv.Options.FixedTree.TimerPollInterval.ShouldBe(TimeSpan.FromMinutes(1));
drv.Options.AlarmProjection.Enabled.ShouldBeTrue();
drv.Options.AlarmProjection.PollInterval.ShouldBe(TimeSpan.FromSeconds(3));
drv.Options.HandleRecycle.Enabled.ShouldBeTrue();
drv.Options.HandleRecycle.Interval.ShouldBe(TimeSpan.FromMinutes(30));
}
// ---- helpers ----
private sealed class RecordingBuilder : IAddressSpaceBuilder
{
public List<(string BrowseName, DriverAttributeInfo Info)> Variables { get; } = new();
public List<(string BrowseName, string DisplayName)> Folders { get; } = new();
public IAddressSpaceBuilder Folder(string browseName, string displayName)
{ Folders.Add((browseName, displayName)); return this; }
public IVariableHandle Variable(string browseName, string displayName, DriverAttributeInfo info)
{ Variables.Add((browseName, info)); return new Handle(info.FullName); }
public void AddProperty(string _, DriverDataType __, object? ___) { }
private sealed class Handle(string fullRef) : IVariableHandle
{
public string FullReference => fullRef;
public IAlarmConditionSink MarkAsAlarmCondition(AlarmConditionInfo info) => new NullSink();
}
private sealed class NullSink : IAlarmConditionSink { public void OnTransition(AlarmEventArgs args) { } }
}
}