# Galaxy parity rig — runbook

> ✅ **Completed 2026-04-30 — historical record.** This runbook is the
> recipe that produced the green parity matrix that gated PR 7.2
> (retire legacy Galaxy projects, merged at commit `ae7106d`). The
> matrix it produced is captured in
> [`Galaxy.ParityMatrix.md`](Galaxy.ParityMatrix.md), also marked
> historical. The test project this doc drove
> (`Driver.Galaxy.ParityTests`) was deleted in PR 7.2, along with
> `Driver.Galaxy.{Host,Proxy,Shared}` and the `OtOpcUaGalaxyHost`
> Windows service. **You cannot re-run this rig today.** Current
> Galaxy testing flows through the gateway's own test suite in the
> sibling `mxaccessgw` repo.
>
> The text below is preserved as-written so the migration trail (what
> was tested, against what shape, with what env vars) stays auditable.

Brings up both Galaxy backends side-by-side against a single live Galaxy
so the parity matrix in `docs/v2/Galaxy.ParityMatrix.md` and the soak
scenario in `tests/ZB.MOM.WW.OtOpcUa.Driver.Galaxy.ParityTests/SoakScenarioTests.cs`
can run for real. Closing the parity matrix was the gate for PR 7.2
(retire legacy Galaxy projects).

## Conceptual layout

```
Galaxy ZB SQL  ──┬──  OtOpcUaGalaxyHost (NSSM service, net48 x86)   [DELETED in PR 7.2]
                 │       └── MxAccess COM, ClientName "OtOpcUa-Galaxy.Host"
                 │       └── named pipe "OtOpcUaGalaxy"
                 │              ▲
                 │              │ pipe IPC
                 │              │
                 │       GalaxyProxyDriver  ◄── parity test (legacy half)
                 │
                 └──  mxaccessgw service
                         └── MxAccess COM, ClientName "OtOpcUa-Parity"
                         └── gRPC on http://localhost:5120
                                ▲
                                │ gRPC
                                │
                         GalaxyDriver (in-process)  ◄── parity test (mxgw half)
```

Both halves talk to the **same Galaxy** through **two distinct MxAccess
sessions** (different ClientNames so they don't evict each other).

## What was on the dev box at the time

Per `~/.claude/projects/.../memory/` *as of the rig run*:

- **AVEVA System Platform + Galaxy + MXAccess runtime** — `project_aveva_platform_installed.md`.
- **`OtOpcUaGalaxyHost`** Windows service running as `dohertj2`, NSSM-wrapped,
  binary at `C:\publish\OtOpcUaGalaxyHost\OtOpcUa.Driver.Galaxy.Host.exe`,
  shared secret at `.local/galaxy-host-secret.txt`, ZB SQL on `localhost:1433`
  — `project_galaxy_host_installed.md`. **(Service uninstalled and binary
  retired as part of PR 7.2; the host source project no longer exists in
  this repo.)**
- **Parity test project** (`Driver.Galaxy.ParityTests`) — committed and
  skip-clean at the time of the rig run. **Deleted in PR 7.2.**

## Setup steps (one-time)

### 1. Build + run mxaccessgw

The gateway source is at `c:\Users\dohertj2\Desktop\mxaccessgw\`.
Build both halves — the worker has to be x86 net48 (MxAccess COM
bitness), the server is .NET 10:

```powershell
cd C:\Users\dohertj2\Desktop\mxaccessgw
dotnet build src\MxGateway.Worker -c Release   # produces bin\x86\Release\net48\MxGateway.Worker.exe
dotnet build src\MxGateway.Server -c Release   # produces bin\Release\net10.0\MxGateway.Server.dll
```

Initialize the auth database and mint an API key. The CLI mode is
gated by an `apikey` first-arg prefix:

```powershell
$env:MxGateway__ApiKeyPepper = "parity-rig-dev-pepper"   # any stable string for dev
$srv = "C:\Users\dohertj2\Desktop\mxaccessgw\src\MxGateway.Server\bin\Release\net10.0\MxGateway.Server.dll"

dotnet $srv apikey init-db                                # → "init-db: initialized"

dotnet $srv apikey create-key `
  --key-id parity-rig `
  --display-name "OtOpcUa-Parity" `
  --scopes "session:open,session:close,invoke:read,invoke:write,invoke:secure,events:read,metadata:read"
# → "API key: mxgw_parity-rig_<base64suffix>"   ← capture this; you can't list secrets later
```

Save that exact key string for `OTOPCUA_PARITY_GW_API_KEY` in step 2.

Run the server with three env-var overrides — the defaults don't
quite match what gRPC + the parity test need:

```powershell
$env:MxGateway__ApiKeyPepper = "parity-rig-dev-pepper"   # MUST match the create-key invocation
$env:Kestrel__Endpoints__Http__Url = "http://localhost:5120"
$env:Kestrel__Endpoints__Http__Protocols = "Http2"        # gRPC needs h2c on plain HTTP
$env:MxGateway__Worker__ExecutablePath = `
  "C:\Users\dohertj2\Desktop\mxaccessgw\src\MxGateway.Worker\bin\x86\Release\net48\MxGateway.Worker.exe"
  # appsettings.json's relative path is missing the \net48 segment; absolute path sidesteps that

dotnet $srv
# → "Now listening on: http://localhost:5120"
```

The worker spawns lazily on the first OpenSession RPC — there's no
worker process visible in Task Manager until the first session. If
the worker can't spawn, the server returns `Failed to open session
session-…` with a `WorkerProcessLaunchException` in the server log.

NSSM-wrap it later if the rig becomes long-lived; for first-pass
provisioning a console window is easier to inspect.

### 2. Set the parity env vars

In the test-runner shell:

```powershell
$env:OTOPCUA_PARITY_GW_ENDPOINT  = "http://localhost:5120"
$env:OTOPCUA_PARITY_GW_API_KEY   = "parity-suite-key"   # match the gw config
$env:OTOPCUA_PARITY_CLIENT_NAME  = "OtOpcUa-Parity"
```

Elevation status doesn't matter — the legacy Galaxy.Host pipe ACL accepts
elevated and non-elevated `dohertj2` shells alike (the Administrators deny
ACE was removed 2026-04-24; see `project_galaxy_host_installed.md`).

### 3. Verify both halves resolve

```powershell
cd C:\Users\dohertj2\Desktop\lmxopcua
dotnet test tests\ZB.MOM.WW.OtOpcUa.Driver.Galaxy.ParityTests\ `
  --filter "FullyQualifiedName~HarnessShapeTests"
```

`Harness_records_a_skip_reason_for_each_unavailable_backend` is the
two-line truth-teller:

- Both `LegacyDriver` non-null + both `MxGatewayDriver` non-null → rig is up.
- One side null → read its `LegacySkipReason` / `MxGatewaySkipReason` and fix.

## Running the matrix

Once both halves resolve:

```powershell
dotnet test tests\ZB.MOM.WW.OtOpcUa.Driver.Galaxy.ParityTests\ `
  --filter "Category=ParityE2E"
```

This runs all 17 scenario tests across the seven scenario classes
(BrowseAndRead / Subscribe / Write / Alarm / History / Reconnect /
ScanState). Each scenario class is independent — failures in one don't
block the rest.

Track the result against `docs/v2/Galaxy.ParityMatrix.md`. Update each
row to:

- **green** if the scenario passes
- **yellow** if it skipped because the dev Galaxy doesn't have the right
  shape (see coverage matrix below)
- **red** if it asserted a real delta — those are the deltas that block
  PR 7.2; chase each before retiring the legacy backend

## Galaxy shape needed for full coverage

Skip-on-empty-shape scenarios fail-soft today. To turn a skip into a
real result, the dev Galaxy needs the shape in the right column:

| Scenario | Needs | Local rig |
|---|---|---|
| `BrowseAndReadParityTests` (3 tests) | Any deployed objects with attributes | ✅ existing seed |
| `SubscribeAndEventRateParityTests` event-rate | ≥5 attributes whose values *change* in 3s | ⚙ scriptable via graccess-cli |
| `WriteByClassificationParityTests` (FreeAccess/Operate) | A FreeAccess/Operate numeric attribute | ⚙ scriptable via graccess-cli |
| `WriteByClassificationParityTests` (Configure/Tune) | A Configure/Tune attribute | ⚙ scriptable via graccess-cli |
| `AlarmTransitionParityTests` (2 tests) | Attributes with the `$Alarm*` extension | ⚙ scriptable via graccess-cli |
| `HistoryReadParityTests` (historized set) | Attributes with the History extension | ⚙ scriptable via graccess-cli |
| `ScanStateProbeParityTests` (2 tests) | Multiple `$WinPlatform` / `$AppEngine` objects | ❌ **deferred to customer rig** — this dev box is provisioned for one platform only |

### The single-platform constraint

The dev box at `DESKTOP-6JL3KKO` is licensed / configured for a single
deployed `$WinPlatform`. Adding a second platform isn't feasible here,
so `ScanStateProbeParityTests` will skip in a "no overlap" branch on
this rig. Both of its scenarios already handle that case gracefully
(`Assert.Skip("no overlapping platform hosts between backends — likely
the transport names differ but no $WinPlatform was discovered")`), so
the matrix reports them as **n/a (deferred)** rather than red.

Plan: defer the two ScanState scenarios to a customer rig with multiple
platforms. The PR 7.2 gate accepts "n/a, deferred" on these rows
provided the legacy `GalaxyRuntimeProbeManager` and the in-process
`PerPlatformProbeWatcher` have matching unit-test coverage of the
state-decoder + member-tracking logic — which they do (PR 4.7's tests).
Treat the runtime parity check as a customer-rig acceptance gate before
that customer goes live, not a precondition for retiring the legacy
projects on this dev box.

### Provisioning the rest via graccess-cli

`C:\Users\dohertj2\Desktop\graccess\graccess_cli\` is a .NET Framework
4.8 console app over the ArchestrA GRAccess COM API. It can configure
templates, instances, attributes, UDAs, extensions, and attribute
security — i.e. every row above marked ⚙ scriptable. Full surface in
`graccess/graccess_cli/docs/usage.md` and per-area workflow guides
(`attribute-editing.md`, `template-editing.md`,
`template-instance-editing.md`).

Reserve a sandbox UDO (e.g. `OtOpcUaParityTest`) to avoid mutating
attributes on plant-relevant objects. Concrete commands per requirement:

**A FreeAccess/Operate numeric attribute** (covers WriteByClassification
FreeAccess/Operate scenario):

```powershell
graccess object uda add `
  --galaxy ZB --name OtOpcUaParityTest --type template `
  --uda OperateValue --data-type MxFloat `
  --category MxCategoryWriteable_C --security MxSecurityOperate `
  --confirm --confirm-target OtOpcUaParityTest
```

**A Configure / Tune attribute** (covers WriteByClassification
Configure/Tune scenario):

```powershell
# Tune
graccess object uda add `
  --galaxy ZB --name OtOpcUaParityTest --type template `
  --uda TuneValue --data-type MxFloat `
  --category MxCategoryWriteable_T --security MxSecurityTune `
  --confirm --confirm-target OtOpcUaParityTest

# Configure
graccess object uda add `
  --galaxy ZB --name OtOpcUaParityTest --type template `
  --uda ConfigValue --data-type MxFloat `
  --category MxCategoryWriteable_C --security MxSecurityConfigure `
  --confirm --confirm-target OtOpcUaParityTest
```

**A changing-value attribute** (covers Subscribe event-rate scenario).
Two ways:

1. *On-scan increment* — bind a script extension that bumps a counter
   each scan. Simplest to author with `object extension add` against
   `ScriptExtension` plus `object attribute set` for the script body
   (see `attribute-editing.md` §"Edit Extensions" for the pattern).
2. *External writer loop* — leave the attribute as plain Float and run
   a one-liner that writes incrementing values from the parity-test
   shell. Uses the legacy backend path so it's available before the
   mxgw subscriber is up. This keeps the Galaxy template clean.

For first-pass validation pick #2 — no template surgery needed, and the
write loop runs only during `dotnet test`.

**Attributes with the `$Alarm*` extension** (covers AlarmTransition
scenario). Per `attribute-editing.md` §"Edit Alarm Settings" the
likely-named attributes vary by extension type
(`Limit`, `RateOfChange`, etc.). Add the extension via:

```powershell
graccess object extension add `
  --galaxy ZB --name OtOpcUaParityTest --type template `
  --extension-type AnalogLimitAlarm --primitive AlarmInput `
  --object-extension `
  --confirm --confirm-target OtOpcUaParityTest
```

Then set HiHi/Hi/Lo/LoLo limit values + priority on the resulting
attributes via `object attribute set`. Inspect first via
`object attributes` to see the names the extension introduces — they
differ across Aveva versions.

**Attributes with the History extension** (covers HistoryRead routing
scenario). History settings are usually attribute or extension
attributes; `attribute-editing.md` §"Edit History Settings" covers the
discovery flow. Quick start:

```powershell
graccess object extension add `
  --galaxy ZB --name OtOpcUaParityTest --type template `
  --extension-type HistoryExtension --primitive HistoryRecord `
  --object-extension `
  --confirm --confirm-target OtOpcUaParityTest

# Then enable history on whichever attribute the extension points at
graccess object attribute set `
  --galaxy ZB --name OtOpcUaParityTest --type template `
  --attribute HistoryEnabled --value true --data-type bool `
  --confirm --confirm-target OtOpcUaParityTest
```

**Deploy + restart Galaxy.Host after any of the above** so MxAccess
sees the change:

```powershell
graccess object deploy --galaxy ZB --name OtOpcUaParityTest_001 `
  --confirm --confirm-target OtOpcUaParityTest_001
sc.exe restart OtOpcUaGalaxyHost   # service no longer exists post-PR-7.2; in the modern shape, restart mxaccessgw instead
```

Then re-run the parity matrix. The previously-skipped scenarios should
now find a sandbox attribute matching their selector and assert.

## Soak run

The 24h × 50k soak gates the production confidence half of PR 7.2.

```powershell
$env:OTOPCUA_SOAK_RUN      = "1"
$env:OTOPCUA_SOAK_TAGS     = "<actual tag count if Galaxy < 50k>"
$env:OTOPCUA_SOAK_MINUTES  = "1440"   # default 24h; compress for first runs
$env:OTOPCUA_SOAK_DROP_PCT = "0.5"

dotnet test tests\ZB.MOM.WW.OtOpcUa.Driver.Galaxy.ParityTests\ `
  --filter "Category=Soak"
```

The test logs a per-minute CSV-style line to stdout:

```
soak,1.0,received=51234,dispatched=51234,dropped=0,ws_mb=412
soak,2.0,received=102468,dispatched=102468,dropped=0,ws_mb=415
...
```

Capture stdout to a file for post-run analysis. The three guards
(`received` growing, `dropped/received` ratio, working-set delta) all
fire mid-run rather than at end-of-test, so a failure surfaces within
the first few minutes if the architecture is wrong.

## Compressed-tag soak (when Galaxy isn't 50k tags)

A first-pass validation is fine with the override:

```powershell
$env:OTOPCUA_SOAK_RUN      = "1"
$env:OTOPCUA_SOAK_TAGS     = "500"      # whatever the dev Galaxy has
$env:OTOPCUA_SOAK_MINUTES  = "60"       # one hour is enough to surface plumbing bugs
$env:OTOPCUA_SOAK_DROP_PCT = "1.0"
```

This validates the *plumbing* (bounded channel, pump invariants, leak
guard) but doesn't pin the 50k-tag scaling assertion. Defer the full
50k validation to a customer rig with that scale, or build a synthetic
Galaxy with a script that imports 50k attributes onto a generated UDO
(~2 hours of one-off work).

## Troubleshooting

- **`MxGatewaySkipReason` says "mxaccessgw not reachable"** — the gw
  isn't listening, or it's on a different port. `Test-NetConnection
  localhost -Port 5120` is the quick check.
- **`MxGatewaySkipReason` says "mxgateway backend boot failed:
  RpcException: Unauthenticated"** — API key mismatch. Verify the
  `OTOPCUA_PARITY_GW_API_KEY` env var matches the gw's configured key.
- **`LegacySkipReason` says "Galaxy ZB SQL not reachable on
  localhost:1433"** — SQL Server isn't running, or its TCP listener is
  off. Check `services.msc` for the SQL Server (default) instance.
- **`LegacySkipReason` says "Galaxy.Host EXE not built"** — at rig time
  the parity harness looked under
  `src/ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Host/bin/Debug/net48/` for the
  EXE it spawned as a subprocess, separate from the published copy at
  `C:\publish\OtOpcUaGalaxyHost\` used by the Windows service. **Both
  the source project and the published binary were removed in PR 7.2,
  so this troubleshooting branch no longer applies — the legacy half
  cannot be brought up at all.**
- **Both halves resolve but parity scenarios assert deltas** — that's
  the expected outcome the rig exists to surface. Review each delta
  against `docs/v2/Galaxy.ParityMatrix.md`'s "Accepted deltas" section
  to decide whether it's a real bug or a pre-accepted divergence.

## After the rig is green

When the matrix is fully green or carries documented accepted-deltas,
PR 7.2 (legacy project deletion) is unblocked. The only follow-up is
to promote any newly-discovered accepted-delta to the matrix doc with
the why so the matrix history stays auditable.