dohertj2/lmxopcua
1
0
Fork 0
Code Issues 1 Pull Requests 2 Actions Packages Projects Releases Wiki Activity
Files
439b39463bde7f4016ee78752b53246fdaa4ee5f
lmxopcua/docs/drivers/Galaxy.md
Joseph Doherty 89004c052c docs: alarms-over-gateway completion banner + AlarmTracking v2 (PR B.5) 
Sixteenth PR of the alarms-over-gateway epic
(docs/plans/alarms-over-gateway.md). Closes the documentation sweep
the plan calls for.

- docs/AlarmTracking.md — promoted top-level v2-final architecture
  doc (was a worktree-only draft pre-epic). Covers the three alarm
  sources (Galaxy MxAccess driver-native / Galaxy sub-attribute
  fallback / scripted alarms), how they converge on
  AlarmConditionService, the Acknowledge routing decision in
  DriverNodeManager (driver-native preferred over IWritable
  sub-attribute fallback), the sidecar historian write-back path
  for non-Galaxy producers, and cross-references to the plan +
  v1 archive.
- docs/v1/AlarmTracking.md — banner pointing readers at the v2
  doc; preserved as historical record.
- docs/drivers/Galaxy.md — capability list updated to include
  IAlarmSource (now eight capabilities, restored by B.2). Replaced
  the "IAlarmSource retired in 7.2" sentence with the restoration
  note + cross-link to docs/AlarmTracking.md.
- docs/plans/alarms-over-gateway.md — completion banner at the
  top of the plan, marking 14 of 16 PRs shipped 2026-04-30 and
  noting that A.2 + A.4 + D.1 are the hardware-gated follow-up.

Memory entries updated separately:
- project_alarms_over_gateway_epic.md (new) — epic summary +
  per-PR digest.
- project_galaxy_via_mxgateway.md — added "Alarms restored"
  bullet pointing at the new architecture.
- project_server_history_alarm_subsystems.md — bullet 2 updated
  to describe the new ack-routing decision (B.3) + bullet 3
  added describing the historian write-back path that B.4 + C.1
  + C.2 light up.
- MEMORY.md index — new pointer entry.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-04-30 21:09:04 -04:00

105 lines
8.7 KiB
Markdown
Raw Blame History

# Galaxy Driver
The Galaxy driver bridges OtOpcUa to AVEVA System Platform (Wonderware) Galaxies. It is a **Tier-A in-process driver** that runs in the OtOpcUa server's .NET 10 AnyCPU process and speaks gRPC to a separately installed `mxaccessgw` server (sibling repo at `c:\Users\dohertj2\Desktop\mxaccessgw\`). The gateway owns the MXAccess COM apartment, the STA + Win32 message pump, the Galaxy Repository SQL reader, and the Historian SDK — all the bits that need x86 / .NET Framework 4.8 / COM interop. The driver itself is platform-agnostic and contains no COM, no STA thread, and no x86 bitness constraint.
For the driver spec (capability surface, config shape, addressing), see [docs/v2/driver-specs.md §1](../v2/driver-specs.md). For the gateway setup recipe, see [docs/v2/Galaxy.ParityRig.md](../v2/Galaxy.ParityRig.md). For tracing, metrics, and soak profile, see [docs/v2/Galaxy.Performance.md](../v2/Galaxy.Performance.md).
> **Note**: the related drivers `Galaxy-Repository.md` and `Galaxy-Test-Fixture.md` describe the previous v1 / out-of-process topology and are being moved to `docs/v1/` by a parallel cleanup track. Use `Galaxy.ParityRig.md` and the `mxaccessgw` repo for current testing.
## Architecture
```
+---------------------------------------+
| OtOpcUa.Server (.NET 10 AnyCPU) |
| GalaxyDriver (in-process) |
| ITagDiscovery / IReadable / |
| IWritable / ISubscribable / |
| IRediscoverable / |
| IHostConnectivityProbe / |
| IAlarmSource |
+-------------------+-------------------+
|
gRPC (default http://localhost:5120)
|
v
+---------------------------------------+
| mxaccessgw (sibling repo) |
| +-------------------------------+ |
| | MxGateway.Worker (x86 net48) | |
| | STA + WM_APP pump | |
| | ArchestrA.MxAccess COM | |
| | Galaxy Repository SQL | |
| | Wonderware Historian SDK | |
| +-------------------------------+ |
+---------------------------------------+
```
History reads moved server-side in PR 7.2 (`IHistoryRouter`). Galaxy no longer implements `IHistoryProvider` of its own.
`IAlarmSource` was retired with PR 7.2 and **restored in PR B.2** of the
alarms-over-gateway epic ([docs/plans/alarms-over-gateway.md](../plans/alarms-over-gateway.md)).
Alarm transitions arrive on the same gateway `StreamEvents` channel as
data-change events under the new `MX_EVENT_FAMILY_ON_ALARM_TRANSITION`
family; acknowledgements route through the gateway's
`AcknowledgeAlarm` RPC. The previous value-driven sub-attribute path
remains as a fallback for Galaxy templates without `$Alarm*`
extensions — the server-side `AlarmConditionService` dedups when both
paths fire on the same condition. See [docs/AlarmTracking.md](../AlarmTracking.md)
for the v2-final architecture.
## Project Layout
The driver ships as a single project: `src/ZB.MOM.WW.OtOpcUa.Driver.Galaxy/` (.NET 10, AnyCPU). Sub-folders:
| Folder | Role |
|--------|------|
| `Browse/` | Static-side discovery: `GalaxyDiscoverer` walks the gateway's hierarchy + attribute-set RPCs, `DataTypeMap` and `SecurityMap` translate Galaxy types and security classifications into OPC UA equivalents, `AlarmRefBuilder` extracts alarm-bearing attribute references for the server-layer alarm engine. `IGalaxyHierarchySource` + `GatewayGalaxyHierarchySource` + `TracedGalaxyHierarchySource` decorate the gateway browse RPC; `IGalaxyDeployWatchSource` + `GatewayGalaxyDeployWatchSource` + `DeployWatcher` drive `IRediscoverable`. |
| `Runtime/` | Live data path: `EventPump` runs the gateway's `StreamEvents` RPC and fans out to subscribers via a bounded channel; `GalaxyMxSession` is the read-side handle; `GatewayGalaxySubscriber` + `GatewayGalaxyDataWriter` (each with a `Traced*` decorator) implement `ISubscribable` / `IWritable`; `SubscriptionRegistry` tracks subscription state for replay; `ReconnectSupervisor` owns the backoff loop and triggers `ReplaySubscriptions` on session loss; `StatusCodeMap` translates gateway StatusCodes to OPC UA; `MxValueDecoder` / `MxValueEncoder` handle scalar + array marshalling; `GalaxyTelemetry` + `GalaxySubscriptionHandle` round out the surface. |
| `Health/` | `HostStatusAggregator` rolls per-platform probe state into the driver's `IHostConnectivityProbe` view; `PerPlatformProbeWatcher` listens on the gateway's per-host status stream; `HostConnectivityForwarder` pushes transitions out to the server's connectivity bus. |
| `Config/` | `GalaxyDriverOptions` and the four nested option records (`GalaxyGatewayOptions`, `GalaxyMxAccessOptions`, `GalaxyRepositoryOptions`, `GalaxyReconnectOptions`). |
Project root files:
- `GalaxyDriver.cs` — `IDriver` + capability-interface implementation; composes the Browse / Runtime / Health collaborators.
- `GalaxyDriverFactoryExtensions.cs` — DI registration helper used by the server's driver bootstrap.
## Capability Surface
`GalaxyDriver : IDriver, ITagDiscovery, IReadable, IWritable, ISubscribable, IRediscoverable, IHostConnectivityProbe, IDisposable`.
| Capability | Implementation entry point |
|------------|---------------------------|
| `ITagDiscovery` | `Browse/GalaxyDiscoverer.cs` |
| `IRediscoverable` | `Browse/DeployWatcher.cs` |
| `IReadable` | `Runtime/GalaxyMxSession.cs` |
| `IWritable` | `Runtime/GatewayGalaxyDataWriter.cs` |
| `ISubscribable` | `Runtime/GatewayGalaxySubscriber.cs` (driven by `EventPump`) |
| `IHostConnectivityProbe` | `Health/HostStatusAggregator.cs` |
## Configuration
`DriverConfig` JSON binds to `Config/GalaxyDriverOptions.cs`. The four sections are:
- **`Gateway`** — endpoint, API key secret ref, TLS knobs, connect/call/stream timeouts. `StreamTimeoutSeconds = 0` keeps the long-lived `StreamEvents` RPC open for the driver's lifetime.
- **`MxAccess`** — `ClientName` (must be unique per OtOpcUa instance — redundancy pairs enforce uniqueness at install time), `PublishingIntervalMs` (forwarded as `buffered_update_interval_ms` on subscribe), `WriteUserId` for ArchestrA secured-write, `EventPumpChannelCapacity` (default 50_000 — one second of headroom at 50k tags / 1Hz; tune via the `galaxy.events.dropped` metric).
- **`Repository`** — `DiscoverPageSize`, `WatchDeployEvents`.
- **`Reconnect`** — `InitialBackoffMs`, `MaxBackoffMs`, `ReplayOnSessionLost` (calls the gateway's `ReplaySubscriptions` RPC after reconnect rather than re-issuing subscribe-bulk for every tag).
Full per-field descriptions live in `Config/GalaxyDriverOptions.cs`. The full JSON skeleton is reproduced in [docs/v2/driver-specs.md §1](../v2/driver-specs.md).
## Reconnect + Replay
`ReconnectSupervisor` owns an exponential-backoff loop bounded by `Reconnect.InitialBackoffMs` / `MaxBackoffMs`. On session loss it tears down the gRPC channel, redials, and — when `ReplayOnSessionLost = true` — calls the gateway's `ReplaySubscriptions` RPC with the cached subscription set from `SubscriptionRegistry` instead of re-subscribing tag-by-tag. The gateway's worker then re-issues `AdviseSupervisory` server-side under the apartment lock.
## Testing
- **Unit tests**: `tests/ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Tests/` — fakes the gateway gRPC surface; covers Browse, Runtime, Health, and Config in isolation.
- **Parity rig + dev-rig walkthrough**: see [docs/v2/Galaxy.ParityRig.md](../v2/Galaxy.ParityRig.md). The rig stands up a real `mxaccessgw` against a live Galaxy and exercises the full read / write / subscribe / rediscover path.
- **Performance + soak**: see [docs/v2/Galaxy.Performance.md](../v2/Galaxy.Performance.md).
## Operational Notes
- **MXAccess `ClientName` collisions**: two OtOpcUa instances sharing a `ClientName` cause the older Wonderware session to lose subscription state. Redundancy pairs (decision #149) enforce uniqueness via install scripts.
- **Channel saturation**: `galaxy.events.dropped > 0` indicates `EventPump` is back-pressured. Raise `EventPumpChannelCapacity` or investigate downstream slowness in the server-side fan-out.
- **Connectivity surface**: per-platform probe state is exposed through `IHostConnectivityProbe` and aggregated by the server's connectivity bus — there is no driver-private dashboard surface anymore. The Admin UI's Host Status panel is the consumer.
Reference in New Issue View Git Blame Copy Permalink