72728a5d45
Add `EvictRuntime` helper that removes + disposes a stale `ConcurrentDictionary` entry. Call it from `ReadSingleAsync`, `ReadGroupAsync`, and `WriteAsync` on non-zero libplctag status and transport exceptions so the next call for the same tag re-creates a fresh handle — mirroring the probe loop's recreate-on-failure pattern. Value-conversion exceptions (NotSupportedException, FormatException, InvalidCastException, OverflowException) are not transport faults and do not evict the handle. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
975 lines
46 KiB
C#
975 lines
46 KiB
C#
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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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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private AbCipAlarmProjection _alarmProjection;
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private DriverHealth _health = new(DriverState.Unknown, null, null);
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public event EventHandler<DataChangeEventArgs>? OnDataChange;
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public event EventHandler<HostStatusChangedEventArgs>? OnHostStatusChanged;
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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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internal void InvokeAlarmEvent(AlarmEventArgs args) => OnAlarmEvent?.Invoke(this, args);
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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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{
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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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_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);
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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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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 = new AbCipTagCreateParams(
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Gateway: device.ParsedAddress.Gateway,
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Port: device.ParsedAddress.Port,
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CipPath: device.ParsedAddress.CipPath,
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LibplctagPlcAttribute: device.Profile.LibplctagPlcAttribute,
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TagName: $"@udt/{templateInstanceId}",
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Timeout: _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
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{
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// Template read failure — log via the driver's health surface so operators see it,
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// but don't propagate since callers should fall back to declaration-driven UDT
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// semantics rather than failing the whole discovery run.
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return null;
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}
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}
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/// <summary>Shared UDT template cache. Exposed for PR 6 (UDT reader) + diagnostics.</summary>
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internal AbCipTemplateCache TemplateCache => _templateCache;
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public string DriverInstanceId => _driverInstanceId;
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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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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);
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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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// Driver.AbCip-005: Structure tags whose Members are declared fan out to per-member
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// entries only. The bare parent name is deliberately NOT registered as a readable
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// tag — reading it would return Good/null (DecodeValue for Structure returns null),
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// which is misleading. Clients read the individual member paths instead.
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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: $"{tag.TagPath}.{member.Name}",
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DataType: member.DataType,
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Writable: member.Writable,
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WriteIdempotent: member.WriteIdempotent);
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// Duplicate-key check: a collision means two configured tags produce the
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// same readable path (e.g. two structure parents with the same member name,
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// or a member name that matches an independently-declared tag). Fail fast
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// at init time with a diagnostic rather than silently clobbering.
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if (_tagsByName.TryGetValue(memberTag.Name, out var existing))
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throw new InvalidOperationException(
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$"AbCip tag name collision: '{memberTag.Name}' is produced by both " +
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$"'{tag.Name}.{member.Name}' (member fan-out) and an existing tag " +
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$"'{existing.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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else
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{
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// Non-structure tag (or Structure with no declared members — kept readable
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// so the whole-UDT path or declaration-only grouping can serve it).
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if (_tagsByName.TryGetValue(tag.Name, out var existing))
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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='{existing.DeviceHostAddress}', " +
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$"TagPath='{existing.TagPath}'. Rename or remove the duplicate.");
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_tagsByName[tag.Name] = tag;
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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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_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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throw;
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}
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return Task.CompletedTask;
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}
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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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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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_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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public Task<ISubscriptionHandle> SubscribeAsync(
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IReadOnlyList<string> fullReferences, TimeSpan publishingInterval, CancellationToken cancellationToken) =>
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Task.FromResult(_poll.Subscribe(fullReferences, publishingInterval));
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public Task UnsubscribeAsync(ISubscriptionHandle handle, CancellationToken cancellationToken)
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{
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_poll.Unsubscribe(handle);
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return Task.CompletedTask;
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}
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// ---- IAlarmSource (ALMD projection, #177) ----
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/// <summary>
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/// Subscribe to ALMD alarm transitions on <paramref name="sourceNodeIds"/>. Each id
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/// names a declared ALMD UDT tag; the projection polls the tag's <c>InFaulted</c> +
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/// <c>Severity</c> members at <see cref="AbCipDriverOptions.AlarmPollInterval"/> and
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/// fires <see cref="OnAlarmEvent"/> on 0→1 (raise) + 1→0 (clear) transitions.
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/// Feature-gated — when <see cref="AbCipDriverOptions.EnableAlarmProjection"/> is
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/// <c>false</c> (the default), returns a handle wrapping a no-op subscription so
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/// capability negotiation still works; <see cref="OnAlarmEvent"/> never fires.
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/// </summary>
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public Task<IAlarmSubscriptionHandle> SubscribeAlarmsAsync(
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IReadOnlyList<string> sourceNodeIds, CancellationToken cancellationToken)
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{
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if (!_options.EnableAlarmProjection)
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{
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var disabled = new AbCipAlarmSubscriptionHandle(0);
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return Task.FromResult<IAlarmSubscriptionHandle>(disabled);
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}
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return _alarmProjection.SubscribeAsync(sourceNodeIds, cancellationToken);
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}
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public Task UnsubscribeAlarmsAsync(IAlarmSubscriptionHandle handle, CancellationToken cancellationToken) =>
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_options.EnableAlarmProjection
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? _alarmProjection.UnsubscribeAsync(handle, cancellationToken)
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: Task.CompletedTask;
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public Task AcknowledgeAsync(
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IReadOnlyList<AlarmAcknowledgeRequest> acknowledgements, CancellationToken cancellationToken) =>
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_options.EnableAlarmProjection
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? _alarmProjection.AcknowledgeAsync(acknowledgements, cancellationToken)
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: Task.CompletedTask;
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// ---- IHostConnectivityProbe ----
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public IReadOnlyList<HostConnectivityStatus> GetHostStatuses() =>
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[.. _devices.Values.Select(s => new HostConnectivityStatus(s.Options.HostAddress, s.HostState, s.HostStateChangedUtc))];
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private async Task ProbeLoopAsync(DeviceState state, CancellationToken ct)
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{
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var probeParams = new AbCipTagCreateParams(
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Gateway: state.ParsedAddress.Gateway,
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Port: state.ParsedAddress.Port,
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CipPath: state.ParsedAddress.CipPath,
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LibplctagPlcAttribute: state.Profile.LibplctagPlcAttribute,
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TagName: _options.Probe.ProbeTagPath!,
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Timeout: _options.Probe.Timeout);
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IAbCipTagRuntime? probeRuntime = null;
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while (!ct.IsCancellationRequested)
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{
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var success = false;
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try
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{
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probeRuntime ??= _tagFactory.Create(probeParams);
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// Lazy-init on first attempt; re-init after a transport failure has caused the
|
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// native handle to be destroyed.
|
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if (!state.ProbeInitialized)
|
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{
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await probeRuntime.InitializeAsync(ct).ConfigureAwait(false);
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state.ProbeInitialized = true;
|
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}
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await probeRuntime.ReadAsync(ct).ConfigureAwait(false);
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success = probeRuntime.GetStatus() == 0;
|
||
}
|
||
catch (OperationCanceledException) when (ct.IsCancellationRequested)
|
||
{
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||
break;
|
||
}
|
||
catch
|
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{
|
||
// Wire / init error — tear down the probe runtime so the next tick re-creates it.
|
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try { probeRuntime?.Dispose(); } catch { }
|
||
probeRuntime = null;
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||
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>
|
||
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>
|
||
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 path that's been here since PR 3. 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 (!_tagsByName.TryGetValue(reference, out var def))
|
||
{
|
||
results[fb.OriginalIndex] = new DataValueSnapshot(null, AbCipStatusMapper.BadNodeIdUnknown, 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}");
|
||
return;
|
||
}
|
||
|
||
var tagPath = AbCipTagPath.TryParse(def.TagPath);
|
||
var bitIndex = tagPath?.BitIndex;
|
||
var value = 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);
|
||
}
|
||
}
|
||
|
||
/// <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}");
|
||
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);
|
||
}
|
||
}
|
||
|
||
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>
|
||
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 (!_tagsByName.TryGetValue(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));
|
||
}
|
||
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);
|
||
}
|
||
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);
|
||
}
|
||
catch (InvalidCastException ice)
|
||
{
|
||
results[i] = new WriteResult(AbCipStatusMapper.BadTypeMismatch);
|
||
_health = new DriverHealth(DriverState.Degraded, _health.LastSuccessfulRead, ice.Message);
|
||
}
|
||
catch (OverflowException oe)
|
||
{
|
||
results[i] = new WriteResult(AbCipStatusMapper.BadOutOfRange);
|
||
_health = new DriverHealth(DriverState.Degraded, _health.LastSuccessfulRead, oe.Message);
|
||
}
|
||
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);
|
||
}
|
||
}
|
||
|
||
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(new AbCipTagCreateParams(
|
||
Gateway: device.ParsedAddress.Gateway,
|
||
Port: device.ParsedAddress.Port,
|
||
CipPath: device.ParsedAddress.CipPath,
|
||
LibplctagPlcAttribute: device.Profile.LibplctagPlcAttribute,
|
||
TagName: parentTagName,
|
||
Timeout: _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}'.");
|
||
|
||
var runtime = _tagFactory.Create(new AbCipTagCreateParams(
|
||
Gateway: device.ParsedAddress.Gateway,
|
||
Port: device.ParsedAddress.Port,
|
||
CipPath: device.ParsedAddress.CipPath,
|
||
LibplctagPlcAttribute: device.Profile.LibplctagPlcAttribute,
|
||
TagName: parsed.ToLibplctagName(),
|
||
Timeout: _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.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 { }
|
||
}
|
||
}
|
||
|
||
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>
|
||
public long GetMemoryFootprint() => 0;
|
||
|
||
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>
|
||
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}";
|
||
udtFolder.Variable(member.Name, member.Name, new DriverAttributeInfo(
|
||
FullName: memberFullName,
|
||
DriverDataType: member.DataType.ToDriverDataType(),
|
||
IsArray: false,
|
||
ArrayDim: 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 = new AbCipTagCreateParams(
|
||
Gateway: state.ParsedAddress.Gateway,
|
||
Port: state.ParsedAddress.Port,
|
||
CipPath: state.ParsedAddress.CipPath,
|
||
LibplctagPlcAttribute: state.Profile.LibplctagPlcAttribute,
|
||
TagName: "@tags",
|
||
Timeout: _options.Timeout);
|
||
|
||
IAddressSpaceBuilder? discoveredFolder = null;
|
||
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}";
|
||
discoveredFolder.Variable(fullName, discovered.Name, new DriverAttributeInfo(
|
||
FullName: fullName,
|
||
DriverDataType: discovered.DataType.ToDriverDataType(),
|
||
IsArray: false,
|
||
ArrayDim: null,
|
||
SecurityClass: discovered.ReadOnly
|
||
? SecurityClassification.ViewOnly
|
||
: SecurityClassification.Operate,
|
||
IsHistorized: false,
|
||
IsAlarm: false,
|
||
WriteIdempotent: false));
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
private static DriverAttributeInfo ToAttributeInfo(AbCipTagDefinition tag) => new(
|
||
FullName: tag.Name,
|
||
DriverDataType: tag.DataType.ToDriverDataType(),
|
||
IsArray: false,
|
||
ArrayDim: 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>
|
||
internal DeviceState? GetDeviceState(string hostAddress) =>
|
||
_devices.TryGetValue(hostAddress, out var s) ? s : null;
|
||
|
||
public void Dispose() => DisposeAsync().AsTask().GetAwaiter().GetResult();
|
||
|
||
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)
|
||
{
|
||
public AbCipHostAddress ParsedAddress { get; } = parsedAddress;
|
||
public AbCipDeviceOptions Options { get; } = options;
|
||
public AbCipPlcFamilyProfile Profile { get; } = profile;
|
||
|
||
public object ProbeLock { get; } = new();
|
||
public HostState HostState { get; set; } = HostState.Unknown;
|
||
public DateTime HostStateChangedUtc { get; set; } = DateTime.UtcNow;
|
||
public CancellationTokenSource? ProbeCts { get; set; }
|
||
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();
|
||
|
||
public SemaphoreSlim GetRmwLock(string parentTagName) =>
|
||
_rmwLocks.GetOrAdd(parentTagName, _ => new SemaphoreSlim(1, 1));
|
||
|
||
public void DisposeHandles()
|
||
{
|
||
foreach (var r in Runtimes.Values) r.Dispose();
|
||
Runtimes.Clear();
|
||
foreach (var r in ParentRuntimes.Values) r.Dispose();
|
||
ParentRuntimes.Clear();
|
||
}
|
||
}
|
||
}
|