Auto: opcuaclient-8 — type definition mirroring
Adds an opt-in pass-3 walk of the upstream TypesFolder (i=86) so the OPC UA Client driver can mirror upstream type definitions into the local address space. Honours the curation rules from PR-7 (#359). Structural mirror only — binary-encoding priming via LoadDataTypeSystem is tracked as a follow-up because that helper was removed from the public ISession surface in OPCFoundation.NetStandard 1.5.378+. - IAddressSpaceBuilder.RegisterTypeNode (default no-op for back-compat) - MirroredTypeNodeInfo + MirroredTypeKind in Core.Abstractions - OpcUaClientDriverOptions.MirrorTypeDefinitions (default false) - DiscoverAsync pass-3: FetchTypeTreeAsync + recursive HasSubtype walk per branch (ObjectTypes/VariableTypes/DataTypes/ReferenceTypes), best-effort IsAbstract read, IncludePaths/ExcludePaths still applied - 6 new unit tests; all 153 OpcUaClient unit tests pass Closes #280
This commit is contained in:
Joseph Doherty
@@ -1038,10 +1038,237 @@ public sealed class OpcUaClientDriver(OpcUaClientDriverOptions options, string d
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// still a couple of hundred ms total since the SDK chunks ReadAsync automatically.
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await EnrichAndRegisterVariablesAsync(session, pendingVariables, cancellationToken)
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.ConfigureAwait(false);
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// Pass 3 (opt-in): mirror upstream type definitions under the four standard type
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// sub-folders (ObjectTypes / VariableTypes / DataTypes / ReferenceTypes). Off by
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// default so existing deployments don't suddenly see a flood of type nodes; enable
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// via OpcUaClientDriverOptions.MirrorTypeDefinitions when downstream clients need
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// the upstream type system to render structured values or decode custom events.
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if (_options.MirrorTypeDefinitions)
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{
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await MirrorTypeDefinitionsAsync(session, builder, includeRegex, excludeRegex,
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cancellationToken).ConfigureAwait(false);
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}
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}
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finally { _gate.Release(); }
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}
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/// <summary>
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/// Pass 3 of discovery: walk the upstream <c>TypesFolder</c> (<c>i=86</c>) and project
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/// the four standard type sub-folders into the local address space via
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/// <see cref="IAddressSpaceBuilder.RegisterTypeNode"/>. Honours the same curation rules
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/// as pass-1 — paths are slash-joined under each type-folder root (e.g.
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/// <c>"ObjectTypes/BaseObjectType/MyType"</c>).
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/// </summary>
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/// <remarks>
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/// <para>
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/// Uses <c>Session.FetchTypeTreeAsync</c> on each of the four root type nodes so the
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/// SDK's TypeTree cache is populated in one batched call per root rather than
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/// per-node round trips during the recursion. This PR ships the structural mirror
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/// only — binary-encoding priming via <c>LoadDataTypeSystem</c> is tracked as a
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/// follow-up because the public SDK surface for that helper was removed in
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/// OPCFoundation.NetStandard 1.5.378+.
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/// </para>
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/// <para>
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/// <c>RegisterTypeNode</c> has a default no-op implementation on the interface so
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/// most builders (Galaxy, Modbus, FOCAS, S7, TwinCAT, AB-CIP) ignore the projection
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/// entirely — only the OPC UA server-side <c>DriverNodeManager</c> needs to override
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/// it for the client driver's mirror pass to surface in the OPC UA server's address
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/// space.
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/// </para>
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/// </remarks>
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private async Task MirrorTypeDefinitionsAsync(
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ISession session, IAddressSpaceBuilder builder,
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Regex? includeRegex, Regex? excludeRegex, CancellationToken ct)
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{
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// FetchTypeTreeAsync populates the SDK-side TypeTree cache rooted at the four standard
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// type folders. This isn't free (it's a hierarchical browse) but it's the canonical way
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// to prime the cache so subsequent NodeCache.FetchNode calls hit memory rather than the
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// wire on every type. Failures are caught + logged-via-health-surface — the structural
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// mirror still proceeds with an empty cache.
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try
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{
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var typeRoots = new ExpandedNodeIdCollection
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{
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new ExpandedNodeId(ObjectIds.ObjectTypesFolder),
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new ExpandedNodeId(ObjectIds.VariableTypesFolder),
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new ExpandedNodeId(ObjectIds.DataTypesFolder),
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new ExpandedNodeId(ObjectIds.ReferenceTypesFolder),
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};
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await session.FetchTypeTreeAsync(typeRoots, ct).ConfigureAwait(false);
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}
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catch
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{
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// Non-fatal — the structural mirror still works without a primed TypeTree cache;
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// we just don't get the in-memory super-type chain shortcuts.
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}
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// Note: this PR ships the structural mirror only. A previous SDK version exposed
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// ISession.LoadDataTypeSystem(NodeId, CancellationToken) for priming structured-type
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// encodings; that method was removed from the public surface in OPCFoundation.NetStandard
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// 1.5.378+. Loading the binary type system now requires per-node walks of the encoding
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// dictionaries via NodeCache helpers, which is significant additional scope. Tracked as
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// a follow-up; existing deployments that need structured-type decoding can mirror the
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// raw type tree today and consume Variant<ExtensionObject> on the client side.
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await MirrorTypeBranchAsync(session, builder, ObjectIds.ObjectTypesFolder,
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MirroredTypeKind.ObjectType, "ObjectTypes", includeRegex, excludeRegex, ct)
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.ConfigureAwait(false);
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await MirrorTypeBranchAsync(session, builder, ObjectIds.VariableTypesFolder,
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MirroredTypeKind.VariableType, "VariableTypes", includeRegex, excludeRegex, ct)
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.ConfigureAwait(false);
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await MirrorTypeBranchAsync(session, builder, ObjectIds.DataTypesFolder,
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MirroredTypeKind.DataType, "DataTypes", includeRegex, excludeRegex, ct)
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.ConfigureAwait(false);
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await MirrorTypeBranchAsync(session, builder, ObjectIds.ReferenceTypesFolder,
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MirroredTypeKind.ReferenceType, "ReferenceTypes", includeRegex, excludeRegex, ct)
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.ConfigureAwait(false);
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}
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/// <summary>
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/// Recursive walk of a single type-folder branch (ObjectType / VariableType / DataType /
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/// ReferenceType). Uses HasSubtype reference walking (the canonical OPC UA way to
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/// enumerate type hierarchies) — IncludeSubtypes=false so the recursion controls depth
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/// itself rather than the server bulk-returning the full subtree at the root.
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/// </summary>
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private async Task MirrorTypeBranchAsync(
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ISession session, IAddressSpaceBuilder builder,
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NodeId rootNode, MirroredTypeKind kind, string rootSegmentName,
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Regex? includeRegex, Regex? excludeRegex, CancellationToken ct)
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{
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var visited = new HashSet<NodeId>();
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var discovered = 0;
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await WalkTypeNodeAsync(session, builder, rootNode, kind, rootSegmentName,
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superTypeNodeId: null, depth: 0, visited, includeRegex, excludeRegex,
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() => discovered, () => discovered++, ct).ConfigureAwait(false);
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}
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private async Task WalkTypeNodeAsync(
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ISession session, IAddressSpaceBuilder builder,
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NodeId node, MirroredTypeKind kind, string pathPrefix,
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string? superTypeNodeId, int depth,
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HashSet<NodeId> visited, Regex? includeRegex, Regex? excludeRegex,
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Func<int> discovered, Action increment, CancellationToken ct)
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{
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if (depth >= _options.MaxBrowseDepth) return;
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if (discovered() >= _options.MaxDiscoveredNodes) return;
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if (!visited.Add(node)) return;
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// Browse subtypes only (HasSubtype): for an Object/Variable/ReferenceType the children
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// we care about are subtypes. We don't need to enumerate property nodes / instance
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// children of types at this layer — RegisterTypeNode is purely for the type identity.
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var browseDescriptions = new BrowseDescriptionCollection
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{
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new()
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{
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NodeId = node,
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BrowseDirection = BrowseDirection.Forward,
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ReferenceTypeId = ReferenceTypeIds.HasSubtype,
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IncludeSubtypes = false,
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NodeClassMask = (uint)(NodeClass.ObjectType | NodeClass.VariableType
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| NodeClass.DataType | NodeClass.ReferenceType),
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ResultMask = (uint)(BrowseResultMask.BrowseName | BrowseResultMask.DisplayName
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| BrowseResultMask.NodeClass),
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}
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};
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BrowseResponse resp;
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try
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{
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resp = await session.BrowseAsync(
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requestHeader: null,
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view: null,
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requestedMaxReferencesPerNode: 0,
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nodesToBrowse: browseDescriptions,
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ct: ct).ConfigureAwait(false);
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}
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catch
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{
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// Transient browse failure — skip this branch, keep the rest of the mirror going.
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return;
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}
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if (resp.Results.Count == 0) return;
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var refs = resp.Results[0].References;
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foreach (var rf in refs)
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{
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if (discovered() >= _options.MaxDiscoveredNodes) break;
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var childId = ExpandedNodeId.ToNodeId(rf.NodeId, session.NamespaceUris);
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if (NodeId.IsNull(childId)) continue;
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var browseName = rf.BrowseName?.Name ?? childId.ToString();
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var displayName = rf.DisplayName?.Text ?? browseName;
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var childPath = pathPrefix + "/" + browseName;
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// Curation rules apply to the type walk too — operators with very tight servers
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// can scope the type mirror via "ObjectTypes/MyVendor/*" globs.
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if (!ShouldInclude(childPath, includeRegex, excludeRegex))
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continue;
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// Read IsAbstract for the type. Treated as best-effort — if the upstream returns
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// Bad we default to false so the mirror still ships rather than dropping the node.
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var isAbstract = await TryReadIsAbstractAsync(session, childId, ct)
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.ConfigureAwait(false);
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var upstreamId = BuildRemappedFullName(childId, session.NamespaceUris,
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_options.Curation.NamespaceRemap);
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var parentId = BuildRemappedFullName(node, session.NamespaceUris,
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_options.Curation.NamespaceRemap);
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builder.RegisterTypeNode(new MirroredTypeNodeInfo(
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Kind: kind,
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UpstreamNodeId: upstreamId,
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BrowseName: browseName,
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DisplayName: displayName,
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SuperTypeNodeId: superTypeNodeId is null ? null : parentId,
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IsAbstract: isAbstract));
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increment();
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// Recurse — depth+1 because each level of HasSubtype is real depth in the type tree.
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// Pass childId-as-supertype string so descendants can record their super-type chain.
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await WalkTypeNodeAsync(session, builder, childId, kind, childPath,
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superTypeNodeId: upstreamId, depth + 1, visited,
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includeRegex, excludeRegex, discovered, increment, ct)
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.ConfigureAwait(false);
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}
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}
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/// <summary>
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/// Best-effort read of the <c>IsAbstract</c> attribute for a type node. Falls back to
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/// <c>false</c> on any read failure so a single bad upstream attribute doesn't drop the
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/// entire type from the mirror.
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/// </summary>
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private static async Task<bool> TryReadIsAbstractAsync(
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ISession session, NodeId node, CancellationToken ct)
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{
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try
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{
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var nodesToRead = new ReadValueIdCollection
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{
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new ReadValueId { NodeId = node, AttributeId = Attributes.IsAbstract },
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};
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var resp = await session.ReadAsync(
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requestHeader: null,
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maxAge: 0,
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timestampsToReturn: TimestampsToReturn.Neither,
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nodesToRead: nodesToRead,
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ct: ct).ConfigureAwait(false);
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if (resp.Results.Count > 0
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&& StatusCode.IsGood(resp.Results[0].StatusCode)
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&& resp.Results[0].Value is bool b)
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{
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return b;
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}
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return false;
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}
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catch
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{
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return false;
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}
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}
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/// <summary>
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/// Translate the curation glob list into a single regex that matches if any pattern
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/// matches. Returns null for null/empty input so the call site can short-circuit
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@@ -191,6 +191,40 @@ public sealed class OpcUaClientDriverOptions
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/// pre-curation behaviour exactly — empty include = include all.
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/// </summary>
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public OpcUaClientCurationOptions Curation { get; init; } = new();
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/// <summary>
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/// When <c>true</c>, <c>DiscoverAsync</c> runs an additional pass that walks the upstream
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/// <c>TypesFolder</c> (<c>i=86</c>) — ObjectTypes (<c>i=88</c>), VariableTypes
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/// (<c>i=89</c>), DataTypes (<c>i=90</c>), ReferenceTypes (<c>i=91</c>) — and projects the
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/// discovered type-definition nodes into the local address space via
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/// <c>IAddressSpaceBuilder.RegisterTypeNode</c>. Default <c>false</c> — opt-in so
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/// existing deployments don't suddenly see a flood of type nodes after upgrade. Enable
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/// when downstream clients need the upstream type system to render structured values or
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/// decode custom event fields.
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/// </summary>
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/// <remarks>
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/// <para>
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/// The type-mirror pass uses <c>Session.FetchTypeTreeAsync</c> on each of the four
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/// root type nodes so the SDK's local TypeTree cache is populated efficiently (one
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/// batched browse per root rather than per-node round trips). This PR ships the
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/// <i>structural</i> mirror only — every type node is registered with its identity,
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/// super-type chain, and IsAbstract flag, but structured-type binary encodings are
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/// NOT primed. (The OPCFoundation SDK removed
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/// <c>ISession.LoadDataTypeSystem(NodeId, CancellationToken)</c> from the public
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/// surface in 1.5.378+; loading binary encodings now requires per-node walks of
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/// <c>HasEncoding</c> + dictionary nodes which is tracked as a follow-up.) Clients
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/// that need structured-type decoding can still consume
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/// <c>Variant<ExtensionObject></c> on the wire.
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/// </para>
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/// <para>
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/// <see cref="OpcUaClientCurationOptions.IncludePaths"/> +
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/// <see cref="OpcUaClientCurationOptions.ExcludePaths"/> still apply to the type
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/// walk; paths are slash-joined under their root (e.g.
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/// <c>"ObjectTypes/BaseObjectType/SomeType"</c>). Most operators want all types so
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/// empty include = include all is the right default.
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/// </para>
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/// </remarks>
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public bool MirrorTypeDefinitions { get; init; } = false;
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}
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/// <summary>
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