Joseph Doherty
1367 lines
74 KiB
C#
1367 lines
74 KiB
C#
using Microsoft.Extensions.Logging;
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using Microsoft.Extensions.Logging.Abstractions;
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using ZB.MOM.WW.OtOpcUa.Core.Abstractions;
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using ZB.MOM.WW.OtOpcUa.Driver.AbCip.PlcFamilies;
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namespace ZB.MOM.WW.OtOpcUa.Driver.AbCip;
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/// <summary>
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/// Allen-Bradley CIP / EtherNet-IP driver for ControlLogix / CompactLogix / Micro800 /
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/// GuardLogix families. Implements all read/write/subscribe/discover/probe/alarm
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/// capabilities via the libplctag.NET wrapper.
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/// </summary>
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/// <remarks>
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/// <para>Wire layer is libplctag 1.6.x (plan decision #11). Per-device host addresses use
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/// the <c>ab://gateway[:port]/cip-path</c> canonical form parsed via
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/// <see cref="AbCipHostAddress.TryParse"/>; those strings become the <c>hostName</c> key
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/// for Polly bulkhead + circuit-breaker isolation per plan decision #144.</para>
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///
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/// <para>Tier A per plan decisions #143–145 — in-process, shares server lifetime, no
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/// sidecar. <see cref="ReinitializeAsync"/> is the Tier-B escape hatch for recovering
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/// from native-heap growth that the CLR allocator can't see; it tears down the
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/// libplctag.NET <c>Tag</c> instances held in <c>DeviceState.Runtimes</c> and reconnects
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/// each device. Native tag lifetime is owned by the libplctag.NET <c>Tag.Dispose()</c>
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/// (called in <see cref="DeviceState.DisposeHandles"/>); the library's own finalizer
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/// handles GC-collected tags.</para>
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/// </remarks>
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public sealed class AbCipDriver : IDriver, IReadable, IWritable, ITagDiscovery, ISubscribable,
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IHostConnectivityProbe, IPerCallHostResolver, IAlarmSource, IDisposable, IAsyncDisposable
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{
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private AbCipDriverOptions _options;
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private readonly string _driverInstanceId;
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private readonly IAbCipTagFactory _tagFactory;
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private readonly IAbCipTagEnumeratorFactory _enumeratorFactory;
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private readonly IAbCipTemplateReaderFactory _templateReaderFactory;
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private readonly AbCipTemplateCache _templateCache = new();
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/// <summary>
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/// Maximum nesting depth the controller-discovered UDT fan-out recurses through. A member
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/// whose path would sit deeper than this (a struct-of-struct chain longer than the cap) is
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/// dropped rather than emitted, bounding both browse-tree breadth and the recursion. Depth
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/// is counted in dotted segments below the discovered parent (the parent's direct atomic
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/// members sit at depth 1).
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/// </summary>
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public const int MaxUdtDepth = 8;
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// Name-keyed UDT shapes consulted by the controller-discovered fan-out, keyed on
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// (deviceHostAddress, structTypeOrMemberName). PRODUCTION REALITY of the two population paths:
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// * TOP-LEVEL discovered UDT — FUNCTIONAL in production. The Symbol Object decoder surfaces the
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// discovered tag's CIP template instance id (AbCipDiscoveredTag.TemplateInstanceId), which
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// DiscoverAsync threads into ResolveDiscoveredUdtShapeAsync -> FetchUdtShapeAsync to read the
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// Template Object off the controller and cache it in the id-keyed _templateCache. No seed
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// needed.
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// * NESTED struct members — FUNCTIONAL in production. A decoded Template Object member block carries
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// the nested UDT's template instance id (low 12 bits of the member info, captured by
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// CipTemplateObjectDecoder onto AbCipUdtMember.NestedTemplateId), which the fan-out threads into
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// ResolveDiscoveredUdtShapeAsync -> FetchUdtShapeAsync to read the nested Template Object off the
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// controller. The name-keyed seed (SeedDiscoveredUdtShapeForTest) still wins first for tests; a
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// nested member whose id can't be resolved is dropped (the top-level UDT still expands).
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private readonly Dictionary<string, AbCipUdtShape> _discoveredUdtShapes =
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new(StringComparer.OrdinalIgnoreCase);
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// Composite key for _discoveredUdtShapes: device + struct/member name joined by a NUL ('\0').
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// A NUL appears in neither a canonical ab:// host address nor a Logix symbol name, so the
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// separator is unambiguous regardless of what either part contains.
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private static string UdtShapeKey(string deviceHostAddress, string structName) =>
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$"{deviceHostAddress}\0{structName}";
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/// <summary>
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/// Test seam — seed a discovered-UDT shape under <paramref name="structName"/> for
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/// <paramref name="deviceHostAddress"/>, consulted by name before any id-keyed fetch. Lets a
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/// fan-out test link a nested sub-shape by member name without a live Template Object read.
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/// Neither the TOP-LEVEL discovered UDT nor a NESTED-struct member needs a seed in production:
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/// both carry a template instance id (the top level on
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/// <see cref="AbCipDiscoveredTag.TemplateInstanceId"/>, a nested member on
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/// <see cref="AbCipUdtMember.NestedTemplateId"/>) that the fan-out fetches via
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/// <see cref="FetchUdtShapeAsync"/>.
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/// </summary>
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/// <param name="deviceHostAddress">The device the struct lives on.</param>
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/// <param name="structName">The discovered struct type or nested-member name.</param>
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/// <param name="shape">The shape to associate with that name.</param>
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internal void SeedDiscoveredUdtShapeForTest(string deviceHostAddress, string structName, AbCipUdtShape shape) =>
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_discoveredUdtShapes[UdtShapeKey(deviceHostAddress, structName)] = shape;
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private readonly PollGroupEngine _poll;
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private readonly Dictionary<string, DeviceState> _devices = new(StringComparer.OrdinalIgnoreCase);
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private readonly Dictionary<string, AbCipTagDefinition> _tagsByName = new(StringComparer.OrdinalIgnoreCase);
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// Resolves a read/write/subscribe fullReference to a tag definition, bridging the two
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// authoring models: an authored tag-table entry (by name) OR an equipment tag whose
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// reference is its raw TagConfig JSON (parsed once via AbCipEquipmentTagParser, cached).
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private readonly EquipmentTagRefResolver<AbCipTagDefinition> _resolver;
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private readonly ILogger<AbCipDriver> _logger;
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private AbCipAlarmProjection _alarmProjection;
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private DriverHealth _health = new(DriverState.Unknown, null, null);
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/// <summary>Occurs when a subscribed tag's value changes.</summary>
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public event EventHandler<DataChangeEventArgs>? OnDataChange;
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/// <summary>Occurs when a device's host connectivity status changes.</summary>
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public event EventHandler<HostStatusChangedEventArgs>? OnHostStatusChanged;
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/// <summary>Occurs when an alarm event is raised.</summary>
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public event EventHandler<AlarmEventArgs>? OnAlarmEvent;
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/// <summary>Internal seam for the alarm projection to raise events through the driver.</summary>
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/// <param name="args">The alarm event arguments.</param>
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internal void InvokeAlarmEvent(AlarmEventArgs args) => OnAlarmEvent?.Invoke(this, args);
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/// <summary>Initializes a new instance of the <see cref="AbCipDriver"/> class.</summary>
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/// <param name="options">The driver configuration options.</param>
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/// <param name="driverInstanceId">A unique identifier for this driver instance.</param>
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/// <param name="tagFactory">Optional factory for creating tag runtimes; uses libplctag default if null.</param>
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/// <param name="enumeratorFactory">Optional factory for enumerating tags; uses libplctag default if null.</param>
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/// <param name="templateReaderFactory">Optional factory for reading UDT templates; uses libplctag default if null.</param>
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/// <param name="logger">Optional logger; uses null logger if not provided.</param>
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public AbCipDriver(AbCipDriverOptions options, string driverInstanceId,
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IAbCipTagFactory? tagFactory = null,
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IAbCipTagEnumeratorFactory? enumeratorFactory = null,
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IAbCipTemplateReaderFactory? templateReaderFactory = null,
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ILogger<AbCipDriver>? logger = null)
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{
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ArgumentNullException.ThrowIfNull(options);
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_options = options;
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_driverInstanceId = driverInstanceId;
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_tagFactory = tagFactory ?? new LibplctagTagFactory();
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_enumeratorFactory = enumeratorFactory ?? new LibplctagTagEnumeratorFactory();
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_templateReaderFactory = templateReaderFactory ?? new LibplctagTemplateReaderFactory();
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_logger = logger ?? NullLogger<AbCipDriver>.Instance;
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_resolver = new EquipmentTagRefResolver<AbCipTagDefinition>(
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r => _tagsByName.TryGetValue(r, out var t) ? t : null,
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r => AbCipEquipmentTagParser.TryParse(r, out var d) ? d : null);
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_poll = new PollGroupEngine(
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reader: ReadAsync,
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onChange: (handle, tagRef, snapshot) =>
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OnDataChange?.Invoke(this, new DataChangeEventArgs(handle, tagRef, snapshot)));
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_alarmProjection = new AbCipAlarmProjection(this, _options.AlarmPollInterval, _logger);
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}
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/// <summary>
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/// Fetch + cache the shape of a Logix UDT by template instance id. First call reads
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/// the Template Object off the controller; subsequent calls for the same
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/// <c>(deviceHostAddress, templateInstanceId)</c> return the cached shape without
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/// additional network traffic. <c>null</c> on template-not-found / decode failure so
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/// callers can fall back to declaration-driven UDT fan-out.
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/// </summary>
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/// <param name="deviceHostAddress">The host address of the device to read the template from.</param>
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/// <param name="templateInstanceId">The instance ID of the UDT template to fetch.</param>
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/// <param name="cancellationToken">Cancellation token for the operation.</param>
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/// <returns>The UDT shape if found and decoded successfully; null otherwise.</returns>
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internal async Task<AbCipUdtShape?> FetchUdtShapeAsync(
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string deviceHostAddress, uint templateInstanceId, CancellationToken cancellationToken)
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{
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var cached = _templateCache.TryGet(deviceHostAddress, templateInstanceId);
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if (cached is not null) return cached;
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if (!_devices.TryGetValue(deviceHostAddress, out var device)) return null;
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var deviceParams = device.BuildCreateParams($"@udt/{templateInstanceId}", _options.Timeout);
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try
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{
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using var reader = _templateReaderFactory.Create();
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var buffer = await reader.ReadAsync(deviceParams, templateInstanceId, cancellationToken).ConfigureAwait(false);
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var shape = CipTemplateObjectDecoder.Decode(buffer);
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if (shape is not null)
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_templateCache.Put(deviceHostAddress, templateInstanceId, shape);
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return shape;
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}
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catch (OperationCanceledException) { throw; }
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catch (Exception ex)
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{
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// Template read failure — surface via the driver's health surface AND a warning
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// log so operators see it; don't propagate since callers should fall back to
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// declaration-driven UDT semantics rather than failing the whole discovery run.
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_logger.LogWarning(ex,
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"AbCip driver {DriverInstanceId} failed to read UDT template {TemplateInstanceId} from device {Device}; " +
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"falling back to declaration-driven UDT semantics",
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_driverInstanceId, templateInstanceId, deviceHostAddress);
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return null;
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}
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}
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/// <summary>
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/// Resolve the shape of a controller-discovered struct/UDT (or a nested-struct member) by
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/// name. Consults the name-keyed <see cref="_discoveredUdtShapes"/> first (the source for
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/// nested-struct sub-shapes + the test seam), then — for the top level only — the id-keyed
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/// template cache via <see cref="FetchUdtShapeAsync"/> when a template instance id is
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/// available. Returns <c>null</c> when no shape can be resolved so the caller degrades to a
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/// single Variable rather than emitting a broken fan-out.
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/// </summary>
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/// <param name="deviceHostAddress">The device the struct lives on.</param>
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/// <param name="structName">The discovered struct type name or a nested-member name.</param>
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/// <param name="templateInstanceId">Top-level template instance id when known; <c>null</c> for a
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/// nested-struct member (which has no fetchable id in the decoded parent shape).</param>
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/// <param name="cancellationToken">Cancellation token for any live template read.</param>
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private async Task<AbCipUdtShape?> ResolveDiscoveredUdtShapeAsync(
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string deviceHostAddress, string structName, uint? templateInstanceId, CancellationToken cancellationToken)
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{
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if (_discoveredUdtShapes.TryGetValue(UdtShapeKey(deviceHostAddress, structName), out var seeded))
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return seeded;
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if (templateInstanceId is { } id)
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return await FetchUdtShapeAsync(deviceHostAddress, id, cancellationToken).ConfigureAwait(false);
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return null;
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}
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/// <summary>
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/// Shared UDT template cache populated by <see cref="FetchUdtShapeAsync"/>. Exposed
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/// internally so tests + diagnostics can inspect cached shapes.
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/// </summary>
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internal AbCipTemplateCache TemplateCache => _templateCache;
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/// <summary>Gets the unique identifier for this driver instance.</summary>
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public string DriverInstanceId => _driverInstanceId;
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/// <summary>Gets the driver type identifier.</summary>
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public string DriverType => "AbCip";
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/// <summary>
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/// Initialize the driver from its <c>DriverConfig</c> JSON. When
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/// <paramref name="driverConfigJson"/> carries a real configuration (any device or tag),
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/// it is parsed via <see cref="AbCipDriverFactoryExtensions.ParseOptions"/> and the
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/// parsed options REPLACE the construction-time options — this is what makes
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/// <see cref="ReinitializeAsync"/> pick up a changed config (new device, new tag,
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/// changed timeout). A blank or empty-object JSON (<c>"{}"</c>) is treated as "no
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/// override" so callers that constructed the driver with explicit options — chiefly
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/// unit tests — keep those options. The driver's address-space + runtime state is then
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/// built from the effective <see cref="_options"/>.
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/// </summary>
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/// <param name="driverConfigJson">The driver configuration as JSON; empty or "{}" means no override.</param>
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/// <param name="cancellationToken">Cancellation token for the operation.</param>
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/// <returns>A task representing the asynchronous initialization.</returns>
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public Task InitializeAsync(string driverConfigJson, CancellationToken cancellationToken)
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{
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_health = new DriverHealth(DriverState.Initializing, null, null);
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try
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{
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if (!string.IsNullOrWhiteSpace(driverConfigJson))
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{
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var parsed = AbCipDriverFactoryExtensions.ParseOptions(_driverInstanceId, driverConfigJson);
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if (parsed.Devices.Count > 0 || parsed.Tags.Count > 0)
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{
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_options = parsed;
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_alarmProjection = new AbCipAlarmProjection(this, _options.AlarmPollInterval, _logger);
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}
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}
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foreach (var device in _options.Devices)
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{
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var addr = AbCipHostAddress.TryParse(device.HostAddress)
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?? throw new InvalidOperationException(
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$"AbCip device has invalid HostAddress '{device.HostAddress}' — expected 'ab://gateway[:port]/cip-path'.");
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var profile = AbCipPlcFamilyProfile.ForFamily(device.PlcFamily);
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_devices[device.HostAddress] = new DeviceState(addr, device, profile);
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}
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foreach (var tag in _options.Tags)
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{
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// Duplicate-key check: a collision means two configured tags have the same name.
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// Fail fast at init time with a diagnostic rather than silently clobbering.
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// (Driver.AbCip-005)
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if (_tagsByName.TryGetValue(tag.Name, out var existingTag))
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throw new InvalidOperationException(
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$"AbCip tag name collision: '{tag.Name}' is declared more than once. " +
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$"Existing entry DeviceHostAddress='{existingTag.DeviceHostAddress}', " +
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$"TagPath='{existingTag.TagPath}'. Rename or remove the duplicate.");
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_tagsByName[tag.Name] = tag;
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if (tag.DataType == AbCipDataType.Structure && tag.Members is { Count: > 0 })
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{
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foreach (var member in tag.Members)
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{
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var memberTag = new AbCipTagDefinition(
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Name: $"{tag.Name}.{member.Name}",
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DeviceHostAddress: tag.DeviceHostAddress,
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TagPath: $"{tag.TagPath}.{member.Name}",
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DataType: member.DataType,
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Writable: member.Writable,
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WriteIdempotent: member.WriteIdempotent);
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// Member fan-out duplicate check: a member-path collision means two
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// configured structure tags produce the same member path, or a member
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// name collides with an independently-declared tag.
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if (_tagsByName.TryGetValue(memberTag.Name, out var existingMember))
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throw new InvalidOperationException(
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$"AbCip tag name collision: '{memberTag.Name}' is produced by both " +
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$"'{tag.Name}.{member.Name}' (member fan-out) and an existing tag " +
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$"'{existingMember.Name}'. Rename one of the configured tags to resolve.");
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_tagsByName[memberTag.Name] = memberTag;
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}
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}
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}
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// Probe loops — one per device when enabled + a ProbeTagPath is configured.
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if (_options.Probe.Enabled && !string.IsNullOrWhiteSpace(_options.Probe.ProbeTagPath))
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{
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foreach (var state in _devices.Values)
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{
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state.ProbeCts = new CancellationTokenSource();
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var ct = state.ProbeCts.Token;
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// Keep the loop Task so ShutdownAsync can await its clean exit before
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// disposing the CTS / handles the loop is still using (Driver.AbCip-008).
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state.ProbeTask = Task.Run(() => ProbeLoopAsync(state, ct), ct);
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}
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}
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else if (_options.Probe.Enabled && _devices.Count > 0)
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{
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// Driver.AbCip-011: probe is Enabled but no ProbeTagPath is configured. Without a
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// tag path the loop has nothing to read, so HostState would stay Unknown forever
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// and GetHostStatuses() would report every device as Unknown with no warning.
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// Log a warning so the misconfiguration is visible in the rolling Serilog file.
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_logger.LogWarning(
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"AbCip probe is enabled but no ProbeTagPath is configured for driver {DriverInstanceId} — " +
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"host connectivity probe loops were NOT started; GetHostStatuses() will report every device " +
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"as Unknown until a ProbeTagPath is set or Probe.Enabled is set to false.",
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_driverInstanceId);
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}
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_health = new DriverHealth(DriverState.Healthy, DateTime.UtcNow, null);
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}
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catch (Exception ex)
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{
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_health = new DriverHealth(DriverState.Faulted, null, ex.Message);
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_logger.LogError(ex, "AbCip driver {DriverInstanceId} failed to initialize", _driverInstanceId);
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throw;
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}
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return Task.CompletedTask;
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}
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/// <summary>Reinitialize the driver by shutting down and reinitializing with new configuration.</summary>
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/// <param name="driverConfigJson">The new driver configuration as JSON.</param>
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/// <param name="cancellationToken">Cancellation token for the operation.</param>
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/// <returns>A task representing the asynchronous reinitialization.</returns>
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public async Task ReinitializeAsync(string driverConfigJson, CancellationToken cancellationToken)
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{
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await ShutdownAsync(cancellationToken).ConfigureAwait(false);
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await InitializeAsync(driverConfigJson, cancellationToken).ConfigureAwait(false);
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}
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/// <summary>
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/// Tear the driver down: stop the alarm projection + poll engine, then for each device
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/// cancel its probe loop, <em>await the loop's clean exit</em>, and only then dispose
|
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/// the probe CTS + runtime handles. Awaiting the probe Task before disposing closes the
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/// race where a still-running loop touches a disposed CTS or a cleared runtime
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/// dictionary (Driver.AbCip-008). Idempotent — safe to call twice (e.g. ShutdownAsync
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/// from ReinitializeAsync followed by DisposeAsync).
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/// </summary>
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/// <param name="cancellationToken">Cancellation token for the operation.</param>
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/// <returns>A task representing the asynchronous shutdown.</returns>
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public async Task ShutdownAsync(CancellationToken cancellationToken)
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{
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await _alarmProjection.DisposeAsync().ConfigureAwait(false);
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await _poll.DisposeAsync().ConfigureAwait(false);
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// Phase 1: signal every probe loop to stop.
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foreach (var state in _devices.Values)
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{
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try { state.ProbeCts?.Cancel(); } catch (ObjectDisposedException) { }
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}
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// Phase 2: wait for each probe loop to observe cancellation and exit. The loop never
|
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// throws on cancellation (it catches OperationCanceledException internally), but guard
|
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// anyway so one slow device can't wedge the whole shutdown.
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foreach (var state in _devices.Values)
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{
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var probeTask = state.ProbeTask;
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if (probeTask is null) continue;
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try
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{
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await probeTask.WaitAsync(TimeSpan.FromSeconds(10), cancellationToken).ConfigureAwait(false);
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}
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catch (TimeoutException) { }
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catch (OperationCanceledException) { }
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}
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// Phase 3: now the loops are gone, dispose the CTS + native handles with no live reader.
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foreach (var state in _devices.Values)
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{
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state.ProbeCts?.Dispose();
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state.ProbeCts = null;
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state.ProbeTask = null;
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state.DisposeHandles();
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}
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_devices.Clear();
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_tagsByName.Clear();
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_resolver.Clear(); // drop transient equipment-tag parses so a config change re-parses
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_health = new DriverHealth(DriverState.Unknown, _health.LastSuccessfulRead, null);
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}
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// ---- ISubscribable (polling overlay via shared engine) ----
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/// <summary>Subscribe to value changes for the specified tag references.</summary>
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/// <param name="fullReferences">The tag references to subscribe to.</param>
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/// <param name="publishingInterval">The interval at which to publish changes.</param>
|
||
/// <param name="cancellationToken">Cancellation token for the operation.</param>
|
||
/// <returns>A handle representing the subscription.</returns>
|
||
public Task<ISubscriptionHandle> SubscribeAsync(
|
||
IReadOnlyList<string> fullReferences, TimeSpan publishingInterval, CancellationToken cancellationToken) =>
|
||
Task.FromResult(_poll.Subscribe(fullReferences, publishingInterval));
|
||
|
||
/// <summary>Unsubscribe from value changes using a subscription handle.</summary>
|
||
/// <param name="handle">The subscription handle to unsubscribe.</param>
|
||
/// <param name="cancellationToken">Cancellation token for the operation.</param>
|
||
/// <returns>A completed task.</returns>
|
||
public Task UnsubscribeAsync(ISubscriptionHandle handle, CancellationToken cancellationToken)
|
||
{
|
||
_poll.Unsubscribe(handle);
|
||
return Task.CompletedTask;
|
||
}
|
||
|
||
// ---- IAlarmSource (ALMD projection, #177) ----
|
||
|
||
/// <summary>
|
||
/// Subscribe to ALMD alarm transitions on <paramref name="sourceNodeIds"/>. Each id
|
||
/// names a declared ALMD UDT tag; the projection polls the tag's <c>InFaulted</c> +
|
||
/// <c>Severity</c> members at <see cref="AbCipDriverOptions.AlarmPollInterval"/> and
|
||
/// fires <see cref="OnAlarmEvent"/> on 0→1 (raise) + 1→0 (clear) transitions.
|
||
/// Feature-gated — when <see cref="AbCipDriverOptions.EnableAlarmProjection"/> is
|
||
/// <c>false</c> (the default), returns a handle wrapping a no-op subscription so
|
||
/// capability negotiation still works; <see cref="OnAlarmEvent"/> never fires.
|
||
/// </summary>
|
||
/// <param name="sourceNodeIds">The node IDs of alarm sources to subscribe to.</param>
|
||
/// <param name="cancellationToken">Cancellation token for the operation.</param>
|
||
/// <returns>A handle representing the alarm subscription.</returns>
|
||
public Task<IAlarmSubscriptionHandle> SubscribeAlarmsAsync(
|
||
IReadOnlyList<string> sourceNodeIds, CancellationToken cancellationToken)
|
||
{
|
||
if (!_options.EnableAlarmProjection)
|
||
{
|
||
var disabled = new AbCipAlarmSubscriptionHandle(0);
|
||
return Task.FromResult<IAlarmSubscriptionHandle>(disabled);
|
||
}
|
||
return _alarmProjection.SubscribeAsync(sourceNodeIds, cancellationToken);
|
||
}
|
||
|
||
/// <summary>Unsubscribe from alarm events.</summary>
|
||
/// <param name="handle">The alarm subscription handle.</param>
|
||
/// <param name="cancellationToken">Cancellation token for the operation.</param>
|
||
/// <returns>A completed task.</returns>
|
||
public Task UnsubscribeAlarmsAsync(IAlarmSubscriptionHandle handle, CancellationToken cancellationToken) =>
|
||
_options.EnableAlarmProjection
|
||
? _alarmProjection.UnsubscribeAsync(handle, cancellationToken)
|
||
: Task.CompletedTask;
|
||
|
||
/// <summary>Acknowledge alarms.</summary>
|
||
/// <param name="acknowledgements">The alarm acknowledgements to process.</param>
|
||
/// <param name="cancellationToken">Cancellation token for the operation.</param>
|
||
/// <returns>A completed task.</returns>
|
||
public Task AcknowledgeAsync(
|
||
IReadOnlyList<AlarmAcknowledgeRequest> acknowledgements, CancellationToken cancellationToken) =>
|
||
_options.EnableAlarmProjection
|
||
? _alarmProjection.AcknowledgeAsync(acknowledgements, cancellationToken)
|
||
: Task.CompletedTask;
|
||
|
||
// ---- IHostConnectivityProbe ----
|
||
|
||
/// <summary>Gets the connectivity status of all configured devices.</summary>
|
||
/// <returns>A read-only list of host connectivity statuses.</returns>
|
||
public IReadOnlyList<HostConnectivityStatus> GetHostStatuses() =>
|
||
[.. _devices.Values.Select(s => new HostConnectivityStatus(s.Options.HostAddress, s.HostState, s.HostStateChangedUtc))];
|
||
|
||
private async Task ProbeLoopAsync(DeviceState state, CancellationToken ct)
|
||
{
|
||
var probeParams = state.BuildCreateParams(_options.Probe.ProbeTagPath!, _options.Probe.Timeout);
|
||
|
||
IAbCipTagRuntime? probeRuntime = null;
|
||
while (!ct.IsCancellationRequested)
|
||
{
|
||
var success = false;
|
||
try
|
||
{
|
||
probeRuntime ??= _tagFactory.Create(probeParams);
|
||
// Lazy-init on first attempt; re-init after a transport failure has caused the
|
||
// native handle to be destroyed.
|
||
if (!state.ProbeInitialized)
|
||
{
|
||
await probeRuntime.InitializeAsync(ct).ConfigureAwait(false);
|
||
state.ProbeInitialized = true;
|
||
}
|
||
await probeRuntime.ReadAsync(ct).ConfigureAwait(false);
|
||
success = probeRuntime.GetStatus() == 0;
|
||
}
|
||
catch (OperationCanceledException) when (ct.IsCancellationRequested)
|
||
{
|
||
break;
|
||
}
|
||
catch (Exception ex)
|
||
{
|
||
// Wire / init error — tear down the probe runtime so the next tick re-creates it.
|
||
// Log at debug because a wedged device produces one per tick; the
|
||
// OnHostStatusChanged event is the persistent record once the state transitions.
|
||
_logger.LogDebug(ex,
|
||
"AbCip probe tick failed for driver {DriverInstanceId} device {Device}",
|
||
_driverInstanceId, state.Options.HostAddress);
|
||
try { probeRuntime?.Dispose(); } catch { }
|
||
probeRuntime = null;
|
||
state.ProbeInitialized = false;
|
||
}
|
||
|
||
TransitionDeviceState(state, success ? HostState.Running : HostState.Stopped);
|
||
|
||
try { await Task.Delay(_options.Probe.Interval, ct).ConfigureAwait(false); }
|
||
catch (OperationCanceledException) { break; }
|
||
}
|
||
|
||
try { probeRuntime?.Dispose(); } catch { }
|
||
}
|
||
|
||
private void TransitionDeviceState(DeviceState state, HostState newState)
|
||
{
|
||
HostState old;
|
||
lock (state.ProbeLock)
|
||
{
|
||
old = state.HostState;
|
||
if (old == newState) return;
|
||
state.HostState = newState;
|
||
state.HostStateChangedUtc = DateTime.UtcNow;
|
||
}
|
||
OnHostStatusChanged?.Invoke(this,
|
||
new HostStatusChangedEventArgs(state.Options.HostAddress, old, newState));
|
||
}
|
||
|
||
// ---- IPerCallHostResolver ----
|
||
|
||
/// <summary>
|
||
/// Resolve the device host address for a given tag full-reference. Per plan decision #144
|
||
/// the Phase 6.1 resilience pipeline keys its bulkhead + breaker on
|
||
/// <c>(DriverInstanceId, hostName)</c> so multi-PLC drivers get per-device isolation —
|
||
/// one dead PLC trips only its own breaker. Unknown references fall back to the
|
||
/// first configured device's host address rather than throwing — the invoker handles the
|
||
/// mislookup at the capability level when the actual read returns BadNodeIdUnknown.
|
||
/// </summary>
|
||
/// <param name="fullReference">The full tag reference to resolve.</param>
|
||
/// <returns>The device host address for the tag.</returns>
|
||
public string ResolveHost(string fullReference)
|
||
{
|
||
if (_tagsByName.TryGetValue(fullReference, out var def))
|
||
return def.DeviceHostAddress;
|
||
return _options.Devices.FirstOrDefault()?.HostAddress ?? DriverInstanceId;
|
||
}
|
||
|
||
// ---- IReadable ----
|
||
|
||
/// <summary>
|
||
/// Read each <c>fullReference</c> in order. Unknown tags surface as
|
||
/// <c>BadNodeIdUnknown</c>; libplctag-layer failures map through
|
||
/// <see cref="AbCipStatusMapper.MapLibplctagStatus(int)"/>; any other exception becomes
|
||
/// <c>BadCommunicationError</c>. The driver health surface is updated per-call so the
|
||
/// Admin UI sees a tight feedback loop between read failures + the driver's state.
|
||
/// </summary>
|
||
/// <param name="fullReferences">The tag references to read.</param>
|
||
/// <param name="cancellationToken">Cancellation token for the operation.</param>
|
||
/// <returns>A read-only list of data value snapshots.</returns>
|
||
public async Task<IReadOnlyList<DataValueSnapshot>> ReadAsync(
|
||
IReadOnlyList<string> fullReferences, CancellationToken cancellationToken)
|
||
{
|
||
ArgumentNullException.ThrowIfNull(fullReferences);
|
||
var now = DateTime.UtcNow;
|
||
var results = new DataValueSnapshot[fullReferences.Count];
|
||
|
||
// Task #194 — plan the batch: members of the same parent UDT get collapsed into one
|
||
// whole-UDT read + in-memory member decode; every other reference falls back to the
|
||
// per-tag read path. Planner is a pure function over the
|
||
// current tag map; BOOL/String/Structure members stay on the fallback path because
|
||
// declaration-only offsets can't place them under Logix alignment rules. Whole-UDT
|
||
// grouping is itself gated behind EnableDeclarationOnlyUdtGrouping — Studio 5000 may
|
||
// reorder UDT members vs declaration order, so the fast path is opt-in only (see
|
||
// Driver.AbCip-003 / AbCipUdtMemberLayout remarks).
|
||
var plan = AbCipUdtReadPlanner.Build(
|
||
fullReferences, _tagsByName, _options.EnableDeclarationOnlyUdtGrouping);
|
||
|
||
foreach (var group in plan.Groups)
|
||
await ReadGroupAsync(group, results, now, cancellationToken).ConfigureAwait(false);
|
||
|
||
foreach (var fb in plan.Fallbacks)
|
||
await ReadSingleAsync(fb, fullReferences[fb.OriginalIndex], results, now, cancellationToken).ConfigureAwait(false);
|
||
|
||
return results;
|
||
}
|
||
|
||
private async Task ReadSingleAsync(
|
||
AbCipUdtReadFallback fb, string reference, DataValueSnapshot[] results, DateTime now, CancellationToken ct)
|
||
{
|
||
if (!_resolver.TryResolve(reference, out var def))
|
||
{
|
||
results[fb.OriginalIndex] = new DataValueSnapshot(null, AbCipStatusMapper.BadNodeIdUnknown, null, now);
|
||
return;
|
||
}
|
||
// Driver.AbCip-005: a Structure tag whose Members are declared is a container —
|
||
// its bare name is readable via the whole-UDT grouping path (ReadGroupAsync), not the
|
||
// per-tag path. Reading it here returns BadNotSupported rather than Good/null so the
|
||
// caller knows to address individual member paths (e.g. "Motor.Speed").
|
||
if (def.DataType == AbCipDataType.Structure && def.Members is { Count: > 0 })
|
||
{
|
||
results[fb.OriginalIndex] = new DataValueSnapshot(null, AbCipStatusMapper.BadNotSupported, null, now);
|
||
return;
|
||
}
|
||
if (!_devices.TryGetValue(def.DeviceHostAddress, out var device))
|
||
{
|
||
results[fb.OriginalIndex] = new DataValueSnapshot(null, AbCipStatusMapper.BadNodeIdUnknown, null, now);
|
||
return;
|
||
}
|
||
|
||
try
|
||
{
|
||
var runtime = await EnsureTagRuntimeAsync(device, def, ct).ConfigureAwait(false);
|
||
await runtime.ReadAsync(ct).ConfigureAwait(false);
|
||
|
||
var status = runtime.GetStatus();
|
||
if (status != 0)
|
||
{
|
||
// Evict the stale handle so the next call re-creates it (Driver.AbCip-010).
|
||
// A non-zero status can mean the controller dropped the connection or the tag
|
||
// handle became permanently invalid (e.g. after a PLC download). Evicting
|
||
// mirrors the probe loop's recreate-on-failure behaviour.
|
||
EvictRuntime(device, def.Name);
|
||
results[fb.OriginalIndex] = new DataValueSnapshot(null,
|
||
AbCipStatusMapper.MapLibplctagStatus(status), null, now);
|
||
_health = new DriverHealth(DriverState.Degraded, _health.LastSuccessfulRead,
|
||
$"libplctag status {status} reading {reference}");
|
||
_logger.LogWarning(
|
||
"AbCip read returned non-zero libplctag status {LibplctagStatus} for tag {Tag} on device {Device}; " +
|
||
"evicting cached runtime so next call re-creates it",
|
||
status, reference, def.DeviceHostAddress);
|
||
return;
|
||
}
|
||
|
||
var tagPath = AbCipTagPath.TryParse(def.TagPath);
|
||
var bitIndex = tagPath?.BitIndex;
|
||
// Review I-1 — an array tag (the EXPLICIT IsArray flag) decodes the whole buffer into an
|
||
// element-typed CLR array (int[]/float[]/bool[]/string[]…), INCLUDING a 1-element array
|
||
// (ElementCount 1). Scalar tags keep the single-value path.
|
||
var value = IsArrayTag(def)
|
||
? runtime.DecodeArray(def.DataType, Math.Max(1, def.ElementCount))
|
||
: runtime.DecodeValue(def.DataType, bitIndex);
|
||
results[fb.OriginalIndex] = new DataValueSnapshot(value, AbCipStatusMapper.Good, now, now);
|
||
_health = new DriverHealth(DriverState.Healthy, now, null);
|
||
}
|
||
catch (OperationCanceledException)
|
||
{
|
||
throw;
|
||
}
|
||
catch (Exception ex)
|
||
{
|
||
// Transport exception — evict so the next read creates a fresh handle.
|
||
EvictRuntime(device, def.Name);
|
||
results[fb.OriginalIndex] = new DataValueSnapshot(null,
|
||
AbCipStatusMapper.BadCommunicationError, null, now);
|
||
_health = new DriverHealth(DriverState.Degraded, _health.LastSuccessfulRead, ex.Message);
|
||
_logger.LogWarning(ex,
|
||
"AbCip read transport exception for tag {Tag} on device {Device}",
|
||
reference, def.DeviceHostAddress);
|
||
}
|
||
}
|
||
|
||
/// <summary>
|
||
/// Task #194 — perform one whole-UDT read on the parent tag, then decode each
|
||
/// grouped member from the runtime's buffer at its computed byte offset. A per-group
|
||
/// failure (parent read raised, non-zero libplctag status, or missing device) stamps
|
||
/// the mapped fault across every grouped member only — sibling groups + the
|
||
/// per-tag fallback list are unaffected.
|
||
/// </summary>
|
||
private async Task ReadGroupAsync(
|
||
AbCipUdtReadGroup group, DataValueSnapshot[] results, DateTime now, CancellationToken ct)
|
||
{
|
||
var parent = group.ParentDefinition;
|
||
|
||
if (!_devices.TryGetValue(parent.DeviceHostAddress, out var device))
|
||
{
|
||
StampGroupStatus(group, results, now, AbCipStatusMapper.BadNodeIdUnknown);
|
||
return;
|
||
}
|
||
|
||
try
|
||
{
|
||
var runtime = await EnsureTagRuntimeAsync(device, parent, ct).ConfigureAwait(false);
|
||
await runtime.ReadAsync(ct).ConfigureAwait(false);
|
||
|
||
var status = runtime.GetStatus();
|
||
if (status != 0)
|
||
{
|
||
EvictRuntime(device, parent.Name); // Driver.AbCip-010
|
||
var mapped = AbCipStatusMapper.MapLibplctagStatus(status);
|
||
StampGroupStatus(group, results, now, mapped);
|
||
_health = new DriverHealth(DriverState.Degraded, _health.LastSuccessfulRead,
|
||
$"libplctag status {status} reading UDT {group.ParentName}");
|
||
_logger.LogWarning(
|
||
"AbCip whole-UDT read returned non-zero libplctag status {LibplctagStatus} for parent {Parent} " +
|
||
"on device {Device}; {MemberCount} member values stamped with mapped status",
|
||
status, group.ParentName, parent.DeviceHostAddress, group.Members.Count);
|
||
return;
|
||
}
|
||
|
||
foreach (var member in group.Members)
|
||
{
|
||
var value = runtime.DecodeValueAt(member.Definition.DataType, member.Offset, bitIndex: null);
|
||
results[member.OriginalIndex] = new DataValueSnapshot(value, AbCipStatusMapper.Good, now, now);
|
||
}
|
||
_health = new DriverHealth(DriverState.Healthy, now, null);
|
||
}
|
||
catch (OperationCanceledException)
|
||
{
|
||
throw;
|
||
}
|
||
catch (Exception ex)
|
||
{
|
||
EvictRuntime(device, parent.Name); // Driver.AbCip-010
|
||
StampGroupStatus(group, results, now, AbCipStatusMapper.BadCommunicationError);
|
||
_health = new DriverHealth(DriverState.Degraded, _health.LastSuccessfulRead, ex.Message);
|
||
_logger.LogWarning(ex,
|
||
"AbCip whole-UDT read transport exception for parent {Parent} on device {Device}",
|
||
group.ParentName, parent.DeviceHostAddress);
|
||
}
|
||
}
|
||
|
||
private static void StampGroupStatus(
|
||
AbCipUdtReadGroup group, DataValueSnapshot[] results, DateTime now, uint statusCode)
|
||
{
|
||
foreach (var member in group.Members)
|
||
results[member.OriginalIndex] = new DataValueSnapshot(null, statusCode, null, now);
|
||
}
|
||
|
||
// ---- IWritable ----
|
||
|
||
/// <summary>
|
||
/// Write each request in order. Writes are NOT auto-retried by the driver — per plan
|
||
/// decisions #44, #45, #143 the caller opts in via <see cref="AbCipTagDefinition.WriteIdempotent"/>
|
||
/// and the resilience pipeline (layered above the driver) decides whether to replay.
|
||
/// Non-writable configurations surface as <c>BadNotWritable</c>; type-conversion failures
|
||
/// as <c>BadTypeMismatch</c>; transport errors as <c>BadCommunicationError</c>.
|
||
/// </summary>
|
||
/// <param name="writes">The write requests to execute.</param>
|
||
/// <param name="cancellationToken">Cancellation token for the operation.</param>
|
||
/// <returns>A read-only list of write results.</returns>
|
||
public async Task<IReadOnlyList<WriteResult>> WriteAsync(
|
||
IReadOnlyList<WriteRequest> writes, CancellationToken cancellationToken)
|
||
{
|
||
ArgumentNullException.ThrowIfNull(writes);
|
||
var results = new WriteResult[writes.Count];
|
||
var now = DateTime.UtcNow;
|
||
|
||
for (var i = 0; i < writes.Count; i++)
|
||
{
|
||
var w = writes[i];
|
||
if (!_resolver.TryResolve(w.FullReference, out var def))
|
||
{
|
||
results[i] = new WriteResult(AbCipStatusMapper.BadNodeIdUnknown);
|
||
continue;
|
||
}
|
||
if (!def.Writable || def.SafetyTag)
|
||
{
|
||
results[i] = new WriteResult(AbCipStatusMapper.BadNotWritable);
|
||
continue;
|
||
}
|
||
if (!_devices.TryGetValue(def.DeviceHostAddress, out var device))
|
||
{
|
||
results[i] = new WriteResult(AbCipStatusMapper.BadNodeIdUnknown);
|
||
continue;
|
||
}
|
||
|
||
try
|
||
{
|
||
var parsedPath = AbCipTagPath.TryParse(def.TagPath);
|
||
|
||
// BOOL-within-DINT writes — per task #181, RMW against a parallel parent-DINT
|
||
// runtime. Dispatching here keeps the normal EncodeValue path clean; the
|
||
// per-parent lock prevents two concurrent bit writes to the same DINT from
|
||
// losing one another's update.
|
||
if (def.DataType == AbCipDataType.Bool && parsedPath?.BitIndex is int bit)
|
||
{
|
||
results[i] = new WriteResult(
|
||
await WriteBitInDIntAsync(device, parsedPath, bit, w.Value, cancellationToken)
|
||
.ConfigureAwait(false));
|
||
if (results[i].StatusCode == AbCipStatusMapper.Good)
|
||
_health = new DriverHealth(DriverState.Healthy, now, null);
|
||
continue;
|
||
}
|
||
|
||
var runtime = await EnsureTagRuntimeAsync(device, def, cancellationToken).ConfigureAwait(false);
|
||
runtime.EncodeValue(def.DataType, parsedPath?.BitIndex, w.Value);
|
||
await runtime.WriteAsync(cancellationToken).ConfigureAwait(false);
|
||
|
||
var status = runtime.GetStatus();
|
||
if (status != 0)
|
||
{
|
||
EvictRuntime(device, def.Name); // Driver.AbCip-010
|
||
results[i] = new WriteResult(AbCipStatusMapper.MapLibplctagStatus(status));
|
||
_logger.LogWarning(
|
||
"AbCip write returned non-zero libplctag status {LibplctagStatus} for tag {Tag} on device {Device}; " +
|
||
"evicting cached runtime so next call re-creates it",
|
||
status, w.FullReference, def.DeviceHostAddress);
|
||
}
|
||
else
|
||
{
|
||
results[i] = new WriteResult(AbCipStatusMapper.Good);
|
||
_health = new DriverHealth(DriverState.Healthy, now, null);
|
||
}
|
||
}
|
||
catch (OperationCanceledException)
|
||
{
|
||
throw;
|
||
}
|
||
catch (NotSupportedException nse)
|
||
{
|
||
// Type/protocol error — not a transport fault; don't evict the handle.
|
||
results[i] = new WriteResult(AbCipStatusMapper.BadNotSupported);
|
||
_health = new DriverHealth(DriverState.Degraded, _health.LastSuccessfulRead, nse.Message);
|
||
_logger.LogWarning(nse,
|
||
"AbCip write not supported for tag {Tag} on device {Device}",
|
||
w.FullReference, def.DeviceHostAddress);
|
||
}
|
||
catch (FormatException fe)
|
||
{
|
||
// Value conversion error — not a transport fault; don't evict.
|
||
results[i] = new WriteResult(AbCipStatusMapper.BadTypeMismatch);
|
||
_health = new DriverHealth(DriverState.Degraded, _health.LastSuccessfulRead, fe.Message);
|
||
_logger.LogWarning(fe,
|
||
"AbCip write value-conversion error for tag {Tag} on device {Device}",
|
||
w.FullReference, def.DeviceHostAddress);
|
||
}
|
||
catch (InvalidCastException ice)
|
||
{
|
||
results[i] = new WriteResult(AbCipStatusMapper.BadTypeMismatch);
|
||
_health = new DriverHealth(DriverState.Degraded, _health.LastSuccessfulRead, ice.Message);
|
||
_logger.LogWarning(ice,
|
||
"AbCip write type-cast error for tag {Tag} on device {Device}",
|
||
w.FullReference, def.DeviceHostAddress);
|
||
}
|
||
catch (OverflowException oe)
|
||
{
|
||
results[i] = new WriteResult(AbCipStatusMapper.BadOutOfRange);
|
||
_health = new DriverHealth(DriverState.Degraded, _health.LastSuccessfulRead, oe.Message);
|
||
_logger.LogWarning(oe,
|
||
"AbCip write value out of range for tag {Tag} on device {Device}",
|
||
w.FullReference, def.DeviceHostAddress);
|
||
}
|
||
catch (Exception ex)
|
||
{
|
||
// Transport / wire error — evict so the next write creates a fresh handle.
|
||
EvictRuntime(device, def.Name); // Driver.AbCip-010
|
||
results[i] = new WriteResult(AbCipStatusMapper.BadCommunicationError);
|
||
_health = new DriverHealth(DriverState.Degraded, _health.LastSuccessfulRead, ex.Message);
|
||
_logger.LogWarning(ex,
|
||
"AbCip write transport exception for tag {Tag} on device {Device}",
|
||
w.FullReference, def.DeviceHostAddress);
|
||
}
|
||
}
|
||
|
||
return results;
|
||
}
|
||
|
||
/// <summary>
|
||
/// Read-modify-write one bit within a DINT parent. Creates / reuses a parallel
|
||
/// parent-DINT runtime (distinct from the bit-selector handle) + serialises concurrent
|
||
/// writers against the same parent via a per-parent <see cref="SemaphoreSlim"/>.
|
||
/// Matches the Modbus BitInRegister + FOCAS PMC Bit pattern shipped in pass 1 of task #181.
|
||
/// </summary>
|
||
private async Task<uint> WriteBitInDIntAsync(
|
||
DeviceState device, AbCipTagPath bitPath, int bit, object? value, CancellationToken ct)
|
||
{
|
||
var parentPath = bitPath with { BitIndex = null };
|
||
var parentName = parentPath.ToLibplctagName();
|
||
|
||
var rmwLock = device.GetRmwLock(parentName);
|
||
await rmwLock.WaitAsync(ct).ConfigureAwait(false);
|
||
try
|
||
{
|
||
var parentRuntime = await EnsureParentRuntimeAsync(device, parentName, ct).ConfigureAwait(false);
|
||
await parentRuntime.ReadAsync(ct).ConfigureAwait(false);
|
||
var readStatus = parentRuntime.GetStatus();
|
||
if (readStatus != 0) return AbCipStatusMapper.MapLibplctagStatus(readStatus);
|
||
|
||
var current = Convert.ToInt32(parentRuntime.DecodeValue(AbCipDataType.DInt, bitIndex: null) ?? 0);
|
||
var updated = Convert.ToBoolean(value)
|
||
? current | (1 << bit)
|
||
: current & ~(1 << bit);
|
||
|
||
parentRuntime.EncodeValue(AbCipDataType.DInt, bitIndex: null, updated);
|
||
await parentRuntime.WriteAsync(ct).ConfigureAwait(false);
|
||
var writeStatus = parentRuntime.GetStatus();
|
||
return writeStatus == 0
|
||
? AbCipStatusMapper.Good
|
||
: AbCipStatusMapper.MapLibplctagStatus(writeStatus);
|
||
}
|
||
finally
|
||
{
|
||
rmwLock.Release();
|
||
}
|
||
}
|
||
|
||
/// <summary>
|
||
/// Get or lazily create a parent-DINT runtime for a parent tag path, cached per-device
|
||
/// so repeated bit writes against the same DINT share one handle.
|
||
/// </summary>
|
||
private async Task<IAbCipTagRuntime> EnsureParentRuntimeAsync(
|
||
DeviceState device, string parentTagName, CancellationToken ct)
|
||
{
|
||
if (device.ParentRuntimes.TryGetValue(parentTagName, out var existing)) return existing;
|
||
|
||
var runtime = _tagFactory.Create(device.BuildCreateParams(parentTagName, _options.Timeout));
|
||
try
|
||
{
|
||
await runtime.InitializeAsync(ct).ConfigureAwait(false);
|
||
}
|
||
catch
|
||
{
|
||
runtime.Dispose();
|
||
throw;
|
||
}
|
||
// Two concurrent callers can both miss the cache + both initialize a runtime; only the
|
||
// first TryAdd wins. Dispose the loser so it doesn't leak a native tag handle.
|
||
if (device.ParentRuntimes.TryAdd(parentTagName, runtime))
|
||
return runtime;
|
||
runtime.Dispose();
|
||
return device.ParentRuntimes[parentTagName];
|
||
}
|
||
|
||
/// <summary>
|
||
/// Idempotently materialise the runtime handle for a tag definition. First call creates
|
||
/// + initialises the libplctag Tag; subsequent calls reuse the cached handle for the
|
||
/// lifetime of the device.
|
||
/// </summary>
|
||
private async Task<IAbCipTagRuntime> EnsureTagRuntimeAsync(
|
||
DeviceState device, AbCipTagDefinition def, CancellationToken ct)
|
||
{
|
||
if (device.Runtimes.TryGetValue(def.Name, out var existing)) return existing;
|
||
|
||
var parsed = AbCipTagPath.TryParse(def.TagPath)
|
||
?? throw new InvalidOperationException(
|
||
$"AbCip tag '{def.Name}' has malformed TagPath '{def.TagPath}'.");
|
||
|
||
// Review I-1 — an array tag (the EXPLICIT IsArray flag, incl. a 1-element array) sets
|
||
// libplctag's elem_count so the read pulls every element in one CIP transaction; the read
|
||
// path then boxes them into a typed CLR array. Scalar tags pass count 1 + IsArray false.
|
||
var runtime = _tagFactory.Create(
|
||
device.BuildCreateParams(
|
||
parsed.ToLibplctagName(), _options.Timeout, def.ElementCount, IsArrayTag(def)));
|
||
try
|
||
{
|
||
await runtime.InitializeAsync(ct).ConfigureAwait(false);
|
||
}
|
||
catch
|
||
{
|
||
runtime.Dispose();
|
||
throw;
|
||
}
|
||
// Two concurrent callers can both miss the cache + both initialize a runtime; only the
|
||
// first TryAdd wins. Dispose the loser so it doesn't leak a native tag handle.
|
||
if (device.Runtimes.TryAdd(def.Name, runtime))
|
||
return runtime;
|
||
runtime.Dispose();
|
||
return device.Runtimes[def.Name];
|
||
}
|
||
|
||
/// <summary>
|
||
/// Evict the runtime for <paramref name="tagName"/> from the device's cache and dispose
|
||
/// it so the next read/write call re-creates and re-initializes a fresh handle.
|
||
/// Called from <see cref="ReadSingleAsync"/>, <see cref="ReadGroupAsync"/>, and
|
||
/// <see cref="WriteAsync"/> after a non-zero libplctag status or transport exception —
|
||
/// mirroring the probe loop's recreate-on-failure behaviour (Driver.AbCip-010).
|
||
/// </summary>
|
||
private static void EvictRuntime(DeviceState device, string tagName)
|
||
{
|
||
if (device.Runtimes.TryRemove(tagName, out var stale))
|
||
{
|
||
try { stale.Dispose(); } catch { }
|
||
}
|
||
}
|
||
|
||
/// <summary>Gets the current health status of the driver.</summary>
|
||
/// <returns>The driver health information.</returns>
|
||
public DriverHealth GetHealth() => _health;
|
||
|
||
/// <summary>
|
||
/// CLR-visible allocation footprint only — libplctag's native heap is invisible to the
|
||
/// GC. driver-specs.md §3 flags this: operators must watch whole-process RSS for the
|
||
/// full picture, and <see cref="ReinitializeAsync"/> is the Tier-B remediation.
|
||
/// </summary>
|
||
/// <returns>The memory footprint in bytes.</returns>
|
||
public long GetMemoryFootprint() => 0;
|
||
|
||
/// <summary>Flushes optional caches to free memory.</summary>
|
||
/// <param name="cancellationToken">Cancellation token for the operation.</param>
|
||
/// <returns>A completed task.</returns>
|
||
public Task FlushOptionalCachesAsync(CancellationToken cancellationToken)
|
||
{
|
||
_templateCache.Clear();
|
||
return Task.CompletedTask;
|
||
}
|
||
|
||
// ---- ITagDiscovery ----
|
||
|
||
/// <summary>
|
||
/// Stream the driver's tag set into the builder. Pre-declared tags from
|
||
/// <see cref="AbCipDriverOptions.Tags"/> emit first; optionally, the
|
||
/// <see cref="IAbCipTagEnumerator"/> walks each device's symbol table and adds
|
||
/// controller-discovered tags under a <c>Discovered/</c> sub-folder. System / module /
|
||
/// routine / task tags are hidden via <see cref="AbCipSystemTagFilter"/>.
|
||
/// </summary>
|
||
/// <param name="builder">The address space builder to populate with discovered tags.</param>
|
||
/// <param name="cancellationToken">Cancellation token for the operation.</param>
|
||
/// <returns>A task representing the asynchronous discovery.</returns>
|
||
public async Task DiscoverAsync(IAddressSpaceBuilder builder, CancellationToken cancellationToken)
|
||
{
|
||
ArgumentNullException.ThrowIfNull(builder);
|
||
var root = builder.Folder("AbCip", "AbCip");
|
||
|
||
foreach (var device in _options.Devices)
|
||
{
|
||
var deviceLabel = device.DeviceName ?? device.HostAddress;
|
||
var deviceFolder = root.Folder(device.HostAddress, deviceLabel);
|
||
|
||
// Pre-declared tags — always emitted; the primary config path. UDT tags with declared
|
||
// Members fan out into a sub-folder + one Variable per member instead of a single
|
||
// Structure Variable (Structure has no useful scalar value + member-addressable paths
|
||
// are what downstream consumers actually want).
|
||
var preDeclared = _options.Tags.Where(t =>
|
||
string.Equals(t.DeviceHostAddress, device.HostAddress, StringComparison.OrdinalIgnoreCase));
|
||
foreach (var tag in preDeclared)
|
||
{
|
||
if (AbCipSystemTagFilter.IsSystemTag(tag.Name)) continue;
|
||
|
||
if (tag.DataType == AbCipDataType.Structure && tag.Members is { Count: > 0 })
|
||
{
|
||
var udtFolder = deviceFolder.Folder(tag.Name, tag.Name);
|
||
foreach (var member in tag.Members)
|
||
{
|
||
var memberFullName = $"{tag.Name}.{member.Name}";
|
||
// Review I-1 — array-ness is the EXPLICIT IsArray flag (a 1-element array is
|
||
// still an array); a legacy member with ElementCount > 1 but the flag unset
|
||
// remains an array for back-compat.
|
||
var memberIsArray = member.IsArray || member.ElementCount > 1;
|
||
udtFolder.Variable(member.Name, member.Name, new DriverAttributeInfo(
|
||
FullName: memberFullName,
|
||
DriverDataType: member.DataType.ToDriverDataType(),
|
||
IsArray: memberIsArray,
|
||
ArrayDim: memberIsArray ? (uint)Math.Max(1, member.ElementCount) : null,
|
||
SecurityClass: member.Writable
|
||
? SecurityClassification.Operate
|
||
: SecurityClassification.ViewOnly,
|
||
IsHistorized: false,
|
||
IsAlarm: false,
|
||
WriteIdempotent: member.WriteIdempotent));
|
||
}
|
||
continue;
|
||
}
|
||
|
||
deviceFolder.Variable(tag.Name, tag.Name, ToAttributeInfo(tag));
|
||
}
|
||
|
||
// Controller-discovered tags — opt-in via EnableControllerBrowse. The real @tags
|
||
// walker (LibplctagTagEnumerator) is the factory default since task #178 shipped,
|
||
// so leaving the flag off keeps the strict-config path for deployments where only
|
||
// declared tags should appear.
|
||
if (_options.EnableControllerBrowse && _devices.TryGetValue(device.HostAddress, out var state))
|
||
{
|
||
using var enumerator = _enumeratorFactory.Create();
|
||
var deviceParams = state.BuildCreateParams("@tags", _options.Timeout);
|
||
|
||
IAddressSpaceBuilder? discoveredFolder = null;
|
||
// Dedup discovered member full-names within this device's Discovered folder.
|
||
var emitted = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
|
||
await foreach (var discovered in enumerator.EnumerateAsync(deviceParams, cancellationToken)
|
||
.ConfigureAwait(false))
|
||
{
|
||
if (discovered.IsSystemTag) continue;
|
||
if (AbCipSystemTagFilter.IsSystemTag(discovered.Name)) continue;
|
||
|
||
discoveredFolder ??= deviceFolder.Folder("Discovered", "Discovered");
|
||
var fullName = discovered.ProgramScope is null
|
||
? discovered.Name
|
||
: $"Program:{discovered.ProgramScope}.{discovered.Name}";
|
||
|
||
// A discovered UDT/struct is expanded into a member sub-folder with one Variable
|
||
// per ATOMIC leaf (mirroring the pre-declared fan-out above), rather than the
|
||
// bogus single Structure → String placeholder Variable. When the shape can't be
|
||
// resolved (or yields no emittable leaf) we fall through to the legacy single
|
||
// Variable so nothing regresses.
|
||
if (discovered.DataType == AbCipDataType.Structure)
|
||
{
|
||
// Pass the discovered tag's CIP template instance id (surfaced by the Symbol
|
||
// Object decoder) so ResolveDiscoveredUdtShapeAsync can fetch the Template Object
|
||
// off the controller via FetchUdtShapeAsync — this is what makes the production
|
||
// top-level UDT fan-out functional (rather than degrading to a placeholder).
|
||
var shape = await ResolveDiscoveredUdtShapeAsync(
|
||
device.HostAddress, discovered.Name, discovered.TemplateInstanceId, cancellationToken)
|
||
.ConfigureAwait(false);
|
||
if (shape is not null)
|
||
{
|
||
// Materialise the member sub-folder LAZILY — only once a leaf is actually
|
||
// about to be emitted into it. A shape that yields no usable atomic leaf
|
||
// then leaves no empty sub-folder behind, and we fall through to the legacy
|
||
// single Variable below.
|
||
var capturedDiscoveredFolder = discoveredFolder;
|
||
var udtFolder = new Lazy<IAddressSpaceBuilder>(
|
||
() => capturedDiscoveredFolder.Folder(fullName, discovered.Name));
|
||
var anyEmitted = await FanOutDiscoveredUdtMembersAsync(
|
||
udtFolder, device.HostAddress, fullName, shape, discovered.ReadOnly,
|
||
depth: 1, emitted, visited: [discovered.Name], cancellationToken)
|
||
.ConfigureAwait(false);
|
||
if (anyEmitted) continue; // expanded — don't emit the placeholder Variable
|
||
// Empty shape (no usable atomic leaf): degrade to a single Variable below.
|
||
}
|
||
}
|
||
|
||
if (!emitted.Add(fullName)) continue;
|
||
// Review I-1 — a discovered array of length 1 is still an array; honour the
|
||
// explicit IsArray flag (legacy ElementCount > 1 still surfaces as an array).
|
||
var discoveredIsArray = discovered.IsArray || discovered.ElementCount > 1;
|
||
discoveredFolder.Variable(fullName, discovered.Name, new DriverAttributeInfo(
|
||
FullName: fullName,
|
||
DriverDataType: discovered.DataType.ToDriverDataType(),
|
||
IsArray: discoveredIsArray,
|
||
ArrayDim: discoveredIsArray ? (uint)Math.Max(1, discovered.ElementCount) : null,
|
||
SecurityClass: discovered.ReadOnly
|
||
? SecurityClassification.ViewOnly
|
||
: SecurityClassification.Operate,
|
||
IsHistorized: false,
|
||
IsAlarm: false,
|
||
WriteIdempotent: false));
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/// <summary>
|
||
/// Recursively fan a controller-discovered UDT shape out into Variable nodes — one per
|
||
/// ATOMIC leaf — under the folder produced by <paramref name="folder"/>. Mirrors the
|
||
/// pre-declared UDT fan-out (member full-name = <c>Parent.Member</c>, dot-joined for nested
|
||
/// structs; atomic <c>DriverDataType</c>; SecurityClass from writability;
|
||
/// <c>IsHistorized:false</c>, <c>IsAlarm:false</c>). Atomic members emit directly; a
|
||
/// nested-struct member recurses into ITS members. Bounded by <see cref="MaxUdtDepth"/>
|
||
/// (deeper members are dropped) and a per-path <paramref name="visited"/> set (cyclic struct
|
||
/// references can't loop). A nested struct whose sub-shape can't be resolved is dropped —
|
||
/// never mis-emitted as a placeholder.
|
||
/// </summary>
|
||
/// <remarks>
|
||
/// The <paramref name="folder"/> is a <see cref="Lazy{T}"/> so the sub-folder node is
|
||
/// materialised only once a leaf is actually about to be emitted into it. A shape (or nested
|
||
/// sub-shape) that yields no emittable leaf therefore never leaves an empty sub-folder in the
|
||
/// browse tree.
|
||
/// </remarks>
|
||
/// <param name="folder">Lazy producer of the address-space sub-folder the member Variables are
|
||
/// emitted under; only forced when the first leaf is emitted.</param>
|
||
/// <param name="deviceHostAddress">The device the UDT lives on (for nested sub-shape lookup).</param>
|
||
/// <param name="parentFullName">Dotted full-name prefix of the parent (e.g. <c>Motor1</c> or
|
||
/// <c>Motor1.Status</c>).</param>
|
||
/// <param name="shape">The resolved shape whose members are fanned out.</param>
|
||
/// <param name="parentReadOnly">Whether the discovered parent tag was read-only (propagated to
|
||
/// members — the Symbol Object carries no per-member access bits).</param>
|
||
/// <param name="depth">Current recursion depth (the parent's direct members are depth 1).</param>
|
||
/// <param name="emitted">Dedup set of member full-names already emitted in this Discovered folder.</param>
|
||
/// <param name="visited">Struct names on the current recursion path (cycle guard).</param>
|
||
/// <param name="cancellationToken">Cancellation token for any nested sub-shape read.</param>
|
||
/// <returns><c>true</c> when at least one atomic leaf was emitted.</returns>
|
||
private async Task<bool> FanOutDiscoveredUdtMembersAsync(
|
||
Lazy<IAddressSpaceBuilder> folder,
|
||
string deviceHostAddress,
|
||
string parentFullName,
|
||
AbCipUdtShape shape,
|
||
bool parentReadOnly,
|
||
int depth,
|
||
HashSet<string> emitted,
|
||
HashSet<string> visited,
|
||
CancellationToken cancellationToken)
|
||
{
|
||
// Defensive: the only caller already gates each descent on depth + 1 <= MaxUdtDepth, so a
|
||
// depth past the cap can't be reached here — kept as a belt-and-suspenders guard.
|
||
if (depth > MaxUdtDepth) return false;
|
||
|
||
var anyEmitted = false;
|
||
foreach (var member in shape.Members)
|
||
{
|
||
var memberFullName = $"{parentFullName}.{member.Name}";
|
||
|
||
if (member.DataType == AbCipDataType.Structure)
|
||
{
|
||
// Nested struct: recurse into its sub-shape if it resolves, the depth cap allows it,
|
||
// and we're not re-entering a struct already on this path (cycle guard). The nested
|
||
// members live a level deeper, so the cap is checked against depth + 1.
|
||
if (depth + 1 > MaxUdtDepth) continue;
|
||
if (!visited.Add(member.Name)) continue; // cyclic UDT reference — stop here
|
||
// The decoded parent shape carries the nested UDT's template instance id (low 12 bits of the
|
||
// member info, captured by CipTemplateObjectDecoder) — thread it so the nested shape is fetched
|
||
// off the controller via FetchUdtShapeAsync, making nested-struct members addressable in
|
||
// production (name-keyed seeded shapes still win first, for the test seam).
|
||
var nested = await ResolveDiscoveredUdtShapeAsync(
|
||
deviceHostAddress, member.Name, templateInstanceId: member.NestedTemplateId, cancellationToken)
|
||
.ConfigureAwait(false);
|
||
if (nested is not null)
|
||
{
|
||
// Materialise the nested sub-folder lazily under the parent folder (itself lazy),
|
||
// so a nested struct that yields no leaf leaves no empty sub-folder behind.
|
||
var parentFolder = folder;
|
||
var nestedFolder = new Lazy<IAddressSpaceBuilder>(
|
||
() => parentFolder.Value.Folder(memberFullName, member.Name));
|
||
var nestedEmitted = await FanOutDiscoveredUdtMembersAsync(
|
||
nestedFolder, deviceHostAddress, memberFullName, nested, parentReadOnly,
|
||
depth + 1, emitted, visited, cancellationToken)
|
||
.ConfigureAwait(false);
|
||
anyEmitted |= nestedEmitted;
|
||
}
|
||
visited.Remove(member.Name);
|
||
continue;
|
||
}
|
||
|
||
// Atomic leaf — emit one Variable. Dedup by full-name within the Discovered folder.
|
||
// Forcing folder.Value here is what materialises the sub-folder on the first real leaf.
|
||
if (!emitted.Add(memberFullName)) continue;
|
||
var memberIsArray = member.ArrayLength > 1;
|
||
folder.Value.Variable(member.Name, member.Name, new DriverAttributeInfo(
|
||
FullName: memberFullName,
|
||
DriverDataType: member.DataType.ToDriverDataType(),
|
||
IsArray: memberIsArray,
|
||
ArrayDim: memberIsArray ? (uint)Math.Max(1, member.ArrayLength) : null,
|
||
// The Symbol Object carries no per-member ExternalAccess bits, so members inherit the
|
||
// parent tag's read-only state (a safety/read-only UDT keeps all its members ViewOnly).
|
||
SecurityClass: parentReadOnly
|
||
? SecurityClassification.ViewOnly
|
||
: SecurityClassification.Operate,
|
||
IsHistorized: false,
|
||
IsAlarm: false,
|
||
WriteIdempotent: false));
|
||
anyEmitted = true;
|
||
}
|
||
|
||
return anyEmitted;
|
||
}
|
||
|
||
// Review I-1 — array-ness is the EXPLICIT IsArray flag (a 1-element array is still an array);
|
||
// a legacy definition carrying only ElementCount > 1 stays an array for back-compat.
|
||
private static bool IsArrayTag(AbCipTagDefinition tag) => tag.IsArray || tag.ElementCount > 1;
|
||
|
||
private static DriverAttributeInfo ToAttributeInfo(AbCipTagDefinition tag) => new(
|
||
FullName: tag.Name,
|
||
DriverDataType: tag.DataType.ToDriverDataType(),
|
||
IsArray: IsArrayTag(tag),
|
||
ArrayDim: IsArrayTag(tag) ? (uint)Math.Max(1, tag.ElementCount) : null,
|
||
SecurityClass: (tag.Writable && !tag.SafetyTag)
|
||
? SecurityClassification.Operate
|
||
: SecurityClassification.ViewOnly,
|
||
IsHistorized: false,
|
||
IsAlarm: false,
|
||
WriteIdempotent: tag.WriteIdempotent);
|
||
|
||
/// <summary>Count of registered devices — exposed for diagnostics + tests.</summary>
|
||
internal int DeviceCount => _devices.Count;
|
||
|
||
/// <summary>Looked-up device state for the given host address. Tests + later-PR capabilities hit this.</summary>
|
||
/// <param name="hostAddress">The host address of the device to look up.</param>
|
||
/// <returns>The device state if found; null otherwise.</returns>
|
||
internal DeviceState? GetDeviceState(string hostAddress) =>
|
||
_devices.TryGetValue(hostAddress, out var s) ? s : null;
|
||
|
||
/// <summary>Releases all resources used by the driver.</summary>
|
||
public void Dispose() => DisposeAsync().AsTask().GetAwaiter().GetResult();
|
||
|
||
/// <summary>Asynchronously releases all resources used by the driver.</summary>
|
||
/// <returns>A value task representing the asynchronous disposal.</returns>
|
||
public async ValueTask DisposeAsync()
|
||
{
|
||
await ShutdownAsync(CancellationToken.None).ConfigureAwait(false);
|
||
}
|
||
|
||
/// <summary>
|
||
/// Per-device runtime state. Holds the parsed host address, family profile, and the
|
||
/// live libplctag.NET <see cref="IAbCipTagRuntime"/> instances keyed by tag name.
|
||
/// Native tag lifetime is owned by the <c>Tag.Dispose()</c> inside each
|
||
/// <see cref="LibplctagTagRuntime"/>; libplctag.NET's own finalizer covers GC-collected
|
||
/// instances so no separate SafeHandle wrapper is needed here (Driver.AbCip-006).
|
||
/// </summary>
|
||
internal sealed class DeviceState(
|
||
AbCipHostAddress parsedAddress,
|
||
AbCipDeviceOptions options,
|
||
AbCipPlcFamilyProfile profile)
|
||
{
|
||
/// <summary>Gets the parsed host address for this device.</summary>
|
||
public AbCipHostAddress ParsedAddress { get; } = parsedAddress;
|
||
/// <summary>Gets the configuration options for this device.</summary>
|
||
public AbCipDeviceOptions Options { get; } = options;
|
||
/// <summary>Gets the PLC family profile for this device.</summary>
|
||
public AbCipPlcFamilyProfile Profile { get; } = profile;
|
||
|
||
/// <summary>Gets the lock object used for probe synchronization.</summary>
|
||
public object ProbeLock { get; } = new();
|
||
/// <summary>Gets or sets the current host state of this device.</summary>
|
||
public HostState HostState { get; set; } = HostState.Unknown;
|
||
/// <summary>Gets or sets the UTC timestamp when the host state was last changed.</summary>
|
||
public DateTime HostStateChangedUtc { get; set; } = DateTime.UtcNow;
|
||
/// <summary>Gets or sets the cancellation token source for the probe loop.</summary>
|
||
public CancellationTokenSource? ProbeCts { get; set; }
|
||
/// <summary>Gets or sets whether the probe has been initialized.</summary>
|
||
public bool ProbeInitialized { get; set; }
|
||
|
||
/// <summary>
|
||
/// The fire-and-forget probe loop's <see cref="Task"/>. Stored so
|
||
/// <see cref="AbCipDriver.ShutdownAsync"/> can await the loop's clean exit after
|
||
/// cancelling <see cref="ProbeCts"/> and BEFORE disposing the CTS or the runtime
|
||
/// handles — otherwise the still-running loop can touch a disposed CTS or a cleared
|
||
/// runtime dictionary (Driver.AbCip-008).
|
||
/// </summary>
|
||
public Task? ProbeTask { get; set; }
|
||
|
||
/// <summary>
|
||
/// Per-tag runtime handles owned by this device. One entry per configured tag is
|
||
/// created lazily on first read (see <see cref="AbCipDriver.EnsureTagRuntimeAsync"/>).
|
||
/// <see cref="System.Collections.Concurrent.ConcurrentDictionary{TKey,TValue}"/>
|
||
/// because <c>ReadAsync</c> is invoked concurrently by the server read path, every
|
||
/// polled subscription loop, and the alarm projection loop.
|
||
/// </summary>
|
||
public System.Collections.Concurrent.ConcurrentDictionary<string, IAbCipTagRuntime> Runtimes { get; } =
|
||
new(StringComparer.OrdinalIgnoreCase);
|
||
|
||
/// <summary>
|
||
/// Parent-DINT runtimes created on-demand by <see cref="AbCipDriver.EnsureParentRuntimeAsync"/>
|
||
/// for BOOL-within-DINT RMW writes. Separate from <see cref="Runtimes"/> because a
|
||
/// bit-selector tag name ("Motor.Flags.3") needs a distinct handle from the DINT
|
||
/// parent ("Motor.Flags") used to do the read + write.
|
||
/// </summary>
|
||
public System.Collections.Concurrent.ConcurrentDictionary<string, IAbCipTagRuntime> ParentRuntimes { get; } =
|
||
new(StringComparer.OrdinalIgnoreCase);
|
||
|
||
private readonly System.Collections.Concurrent.ConcurrentDictionary<string, SemaphoreSlim> _rmwLocks = new();
|
||
|
||
/// <summary>Gets or creates a semaphore for coordinating RMW (read-modify-write) operations on a parent tag.</summary>
|
||
/// <param name="parentTagName">The name of the parent tag.</param>
|
||
/// <returns>A semaphore for coordinating RMW operations.</returns>
|
||
public SemaphoreSlim GetRmwLock(string parentTagName) =>
|
||
_rmwLocks.GetOrAdd(parentTagName, _ => new SemaphoreSlim(1, 1));
|
||
|
||
/// <summary>
|
||
/// Driver.AbCip-013 — compute the effective <see cref="AbCipTagCreateParams"/> for a
|
||
/// tag on this device. Combines the per-device options
|
||
/// (<see cref="AbCipDeviceOptions.AllowPacking"/>,
|
||
/// <see cref="AbCipDeviceOptions.ConnectionSize"/>) with the family profile defaults
|
||
/// so the wire layer sees one place that resolves both.
|
||
/// </summary>
|
||
/// <param name="tagName">The name of the tag to create parameters for.</param>
|
||
/// <param name="timeout">The timeout for tag operations.</param>
|
||
/// <param name="elementCount">libplctag <c>elem_count</c> — 1 for a scalar tag, the array
|
||
/// length for a 1-D array tag (Phase 4c). Coerced to a minimum of 1.</param>
|
||
/// <param name="isArray">Review I-1 — the EXPLICIT array signal threaded through so a
|
||
/// 1-element array (<paramref name="elementCount"/> 1) is still read as an array.</param>
|
||
/// <returns>The computed tag creation parameters.</returns>
|
||
public AbCipTagCreateParams BuildCreateParams(
|
||
string tagName, TimeSpan timeout, int elementCount = 1, bool isArray = false) => new(
|
||
Gateway: ParsedAddress.Gateway,
|
||
Port: ParsedAddress.Port,
|
||
CipPath: ParsedAddress.CipPath,
|
||
LibplctagPlcAttribute: Profile.LibplctagPlcAttribute,
|
||
TagName: tagName,
|
||
Timeout: timeout,
|
||
AllowPacking: Options.AllowPacking ?? Profile.SupportsRequestPacking,
|
||
ConnectionSize: Options.ConnectionSize ?? Profile.DefaultConnectionSize,
|
||
ElementCount: elementCount < 1 ? 1 : elementCount,
|
||
IsArray: isArray);
|
||
|
||
/// <summary>Disposes all runtime tag handles and clears the caches.</summary>
|
||
public void DisposeHandles()
|
||
{
|
||
foreach (var r in Runtimes.Values) r.Dispose();
|
||
Runtimes.Clear();
|
||
foreach (var r in ParentRuntimes.Values) r.Dispose();
|
||
ParentRuntimes.Clear();
|
||
}
|
||
}
|
||
}
|