3d982d9a65
Five doc-content updates after this session's code-review resolution sweep. No code touched; pure documentation drift correction. 1. docs/reqs/HighLevelReqs.md (HLR-007 — Service Hosting): Refreshed the deployment description from "three cooperating processes (Server, Admin, Galaxy.Host)" to "two cooperating Windows services (Server, Admin)". The legacy x86 TopShelf Galaxy.Host process was retired in PR 7.2 (2026-04-30); Galaxy access now flows through the in-process Tier-A GalaxyDriver talking gRPC to the sibling mxaccessgw gateway. Also called out decision #30 (AddWindowsService replacing TopShelf) inline. 2. docs/VirtualTags.md: - Line 9: "compiled via Microsoft.CodeAnalysis.CSharp.Scripting" replaced with the current pipeline (Microsoft.CodeAnalysis.CSharp regular compiler — Core.Scripting-008 / -016 retired the CSharpScript/ScriptRunner path). - Line 39: orphan-thread leak description rewritten. The CSharp.Scripting-era "underlying ScriptRunner keeps running on its thread-pool thread until the Roslyn runtime returns" is no longer accurate — the new pipeline binds the script as a regular C# Func<> delegate, so the leak is now "synchronous CPU-bound work on a pool thread" (same operator-visible effect, different mechanism). 3. docs/v2/plan.md decision #29 ("Galaxy Host is a separate Windows service"): Annotated both the decision body and the decision-log table row with "Reversed PR 7.2, 2026-04-30" + a one-line summary of the replacement architecture. The original reasoning is preserved as audit trail per the decision-log convention. 4. docs/v2/implementation/phase-7-scripting-and-alarming.md A.1: Added an Implementation note describing the Core.Scripting-008 / -016 supersession of the original CSharpScript pipeline. The historical record stays; the note points future readers at docs/VirtualTags.md "Compile cache" for the current contract. 5. docs/plans/alarms-over-gateway.md "Files" section under client regeneration: Updated the .NET regeneration instructions to point at the new ZB.MOM.WW.MxGateway.Contracts.csproj path. The old clients/dotnet/MxGateway.Client.csproj no longer exists in the sibling repo (restructure after this plan was written) and the vendored-binaries situation in src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Galaxy/libs/ is called out so a reader following the plan won't chase a deleted path. Verification: grep against docs/ for the pre-fix wordings ("three cooperating processes", "Galaxy.Host (TopShelf)", "ScriptRunner", the wrong BadDeviceFailure hex code 0x80550000) returns no hits. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
OtOpcUa documentation
Two tiers of documentation live here:
- Current reference at the top level (
docs/*.md) — describes what's shipped today. Start here for operator + integrator reference. - Implementation history + design notes at
docs/v2/*.md— the authoritative plan + decision log the current reference is built from. Start here when you need the why behind an architectural choice, or when a top-level doc says "see plan.md § X".
The project was originally called LmxOpcUa (a single-driver Galaxy/MXAccess OPC UA server) and has since become OtOpcUa, a multi-driver OPC UA server platform. Any lingering LmxOpcUa-string in a path you see in docs is a deliberate residual (executable name lmxopcua-cli, client PKI folder {LocalAppData}/LmxOpcUaClient/) — fixing those requires migration shims + is tracked as follow-ups.
Platform overview
- Core owns the OPC UA stack, address space, session/security/subscription machinery.
- Drivers plug in via capability interfaces in
ZB.MOM.WW.OtOpcUa.Core.Abstractions:IDriver,IReadable,IWritable,ITagDiscovery,ISubscribable,IHostConnectivityProbe,IAlarmSource,IHistoryProvider,IPerCallHostResolver. Each driver opts into whichever it supports. - Server is the OPC UA endpoint process (net10, AnyCPU). Hosts every driver in-process. The Galaxy driver reaches MXAccess via gRPC to a separately-installed mxaccessgw sidecar (sibling repo); it is no longer hosted from this repo.
- Admin is the Blazor Server operator UI (net10, x64). Owns the Config DB draft/publish flow, ACL + role-grant authoring, fleet status +
/metricsscrape endpoint.
Where to find what
Architecture + data-path reference
| Doc | Covers |
|---|---|
| OpcUaServer.md | Top-level server architecture — Core, driver dispatch, Config DB, generations |
| AddressSpace.md | GenericDriverNodeManager + ITagDiscovery + IAddressSpaceBuilder |
| ReadWriteOperations.md | OPC UA Read/Write → CapabilityInvoker → IReadable/IWritable |
| Subscriptions.md | Monitored items → ISubscribable + per-driver subscription refcount (v1 archive) |
| AlarmTracking.md | IAlarmSource + AlarmSurfaceInvoker + OPC UA alarm conditions (v1 archive) |
| DataTypeMapping.md | Per-driver DriverAttributeInfo → OPC UA variable types (v1 archive — live mapping is in src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Galaxy/Browse/DataTypeMap.cs) |
| IncrementalSync.md | Address-space rebuild on redeploy + sp_ComputeGenerationDiff |
| HistoricalDataAccess.md | IHistoryProvider as a per-driver optional capability (v1 archive) |
| VirtualTags.md | Core.Scripting + Core.VirtualTags — Roslyn script sandbox, engine, dispatch alongside driver tags |
| ScriptedAlarms.md | Core.ScriptedAlarms — script-predicate IAlarmSource + Part 9 state machine |
Two Core subsystems are shipped without a dedicated top-level doc; see the section in the linked doc:
| Project | See |
|---|---|
Core.AlarmHistorian |
AlarmTracking.md § Alarm historian sink (v1 archive) |
Analyzers (Roslyn OTOPCUA0001) |
security.md § OTOPCUA0001 Analyzer |
Drivers
| Doc | Covers |
|---|---|
| drivers/README.md | Index of the eight shipped drivers + capability matrix |
| drivers/Galaxy.md | Galaxy driver — in-process gRPC client to the mxaccessgw sidecar |
| v1/drivers/Galaxy-Repository.md | Galaxy-specific discovery via the ZB SQL database (v1 archive — the gateway owns this path now) |
For Modbus / S7 / AB CIP / AB Legacy / TwinCAT / FOCAS / OPC UA Client specifics, see v2/driver-specs.md.
Operational
| Doc | Covers |
|---|---|
| Configuration.md | appsettings bootstrap + Config DB + Admin UI draft/publish (v1 archive — OTOPCUA_GALAXY_* env vars now live in mxaccessgw config) |
| security.md | Transport security profiles, LDAP auth, ACL trie, role grants, OTOPCUA0001 analyzer |
| Redundancy.md | RedundancyCoordinator, ServiceLevelCalculator, apply-lease, Prometheus metrics |
| Reservations.md | Fleet-wide ZTag / SAPID external-ID reservations — publish-time claim, release flow |
| ServiceHosting.md | Two-process deploy (Server + Admin) install/uninstall, plus the optional OtOpcUaWonderwareHistorian sidecar |
| StatusDashboard.md | Pointer — superseded by v2/admin-ui.md |
Client tooling
| Doc | Covers |
|---|---|
| Client.CLI.md | otopcua-cli — OPC UA command-line client |
| Client.UI.md | Avalonia desktop client |
| DriverClis.md | Driver test-client CLIs — index + shared commands |
| Driver.Modbus.Cli.md | otopcua-modbus-cli — Modbus-TCP |
| Driver.AbCip.Cli.md | otopcua-abcip-cli — ControlLogix / CompactLogix / Micro800 / GuardLogix |
| Driver.AbLegacy.Cli.md | otopcua-ablegacy-cli — SLC / MicroLogix / PLC-5 (PCCC) |
| Driver.S7.Cli.md | otopcua-s7-cli — Siemens S7-300 / S7-400 / S7-1200 / S7-1500 |
| Driver.TwinCAT.Cli.md | otopcua-twincat-cli — Beckhoff TwinCAT 2/3 ADS |
| Driver.FOCAS.Cli.md | otopcua-focas-cli — Fanuc FOCAS/2 CNC |
Requirements
| Doc | Covers |
|---|---|
| reqs/HighLevelReqs.md | HLRs — numbered system-level requirements |
| reqs/OpcUaServerReqs.md | OPC UA server-layer reqs |
| v1/reqs/ServiceHostReqs.md | Per-process hosting reqs (v1 archive — only OtOpcUa server hosting remains in scope post-PR-7.2) |
| reqs/ClientRequirements.md | Client CLI + UI reqs |
| v1/reqs/GalaxyRepositoryReqs.md | Galaxy-scoped repository reqs (v1 archive — owned by mxaccessgw today) |
| v1/reqs/MxAccessClientReqs.md | Galaxy-scoped MXAccess reqs (v1 archive — owned by mxaccessgw today) |
| reqs/StatusDashboardReqs.md | Pointer — superseded by Admin UI |
Implementation history (docs/v2/)
Design decisions + phase plans + execution notes. Load-bearing cross-references from the top-level docs:
- v2/plan.md — authoritative v2 vision doc + numbered decision log (referenced as "decision #N" elsewhere)
- v2/admin-ui.md — Admin UI spec
- v2/acl-design.md — data-plane ACL + permission-trie design (Phase 6.2)
- v2/config-db-schema.md — Config DB schema reference
- v2/driver-specs.md — per-driver addressing + quirks for every shipped protocol
- v2/dev-environment.md — dev-box bootstrap
- v2/test-data-sources.md — integration-test simulator matrix (includes the pinned libplctag
ab_serverversion for AB CIP tests) - v2/multi-host-dispatch.md — per-PLC circuit breakers (Phase 6.1 decision #144)
- v2/v2-release-readiness.md — release-readiness tracker
- v2/phase-7-status.md — Phase 7 reconciliation: what shipped vs. the plan, and the five remaining gaps
- v2/implementation/phase--.md — per-phase execution plans with exit-gate evidence
v1 archive
The v1 in-process MXAccess architecture (Galaxy.Host + Galaxy.Proxy + Galaxy.Shared, .NET 4.8 x86 COM, the OtOpcUaGalaxyHost Windows service) was retired in PR 7.2 (2026-04-30, commit ae7106d). Docs that described that shape are kept under v1/ as historical record — see v1/README.md for the index.