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Merge #568/#569/#580/#585: shared AB status map + orphan release, confinement guard tokeniser, adapter + DefaultTransport tests

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Claude-Session: https://claude.ai/code/session_01Ef2ozxS7QPanGT8uoATbTe
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Joseph Doherty
2026-10-07 22:59:30 -04:00
parent 13a6727033 341417f193
commit 29cd25dec8
25 changed files with 430 additions and 310 deletions
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docs/drivers/AbCip.md
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@@ -20,6 +20,7 @@ coverage map, see [AbServer-Test-Fixture.md](AbServer-Test-Fixture.md).
| Project | Role |
|---------|------|
| `src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.AbCip/` | The driver — `AbCipDriver`, the libplctag runtime/enumerator/template-reader wrappers, the UDT read planner + template decoders, the host-address parser, and the ALMD alarm projection. |
| `src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Ab.LibplctagShared/` | Project-less shared source (`LibplctagOrphanRelease.cs`, #578/#580) compiled into both `Driver.AbCip` and `Driver.AbLegacy`. The `AbStatus` → OPC UA table is shared in `Driver.Ab.Transport` (`AbOpcUaStatusMap`). |
| `src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.AbCip.Contracts/` | `AbCipDriverOptions`, `AbCipDeviceOptions`, `AbCipTagDefinition` / `AbCipStructureMember`, and the `AbCipDataType` / `AbCipPlcFamily` enums bound from the driver's `DriverConfig` JSON. |
Per family the `AbCipPlcFamilyProfile` (`PlcFamilies/AbCipPlcFamilyProfile.cs`)
@@ -325,7 +326,7 @@ UDT-typed tags found in the walk.
- **Native heap is invisible to the GC.** libplctag's native `Tag` heap does not show up in CLR allocation figures. Watch whole-process RSS, and use `ReinitializeAsync` (tears down + re-creates every device's libplctag handles) as the remediation for native-heap growth. (There is no per-driver footprint number to consult: `IDriver.GetMemoryFootprint()` was deleted as unconsumed in Gitea #525.)
- **Handle eviction on failure** — a non-zero libplctag status or a transport exception evicts the cached tag runtime so the next read/write re-creates a fresh handle, mirroring the probe loop's recreate-on-failure behaviour.
- **Read statuses carry the libplctag cause** — a tag the controller does not have reads `BadNodeIdUnknown` (not `BadCommunicationError`), and it does **not** open the device's connect-backoff window (the controller answered; before this, one typo throttled every sibling tag on the device). A genuine connection failure still opens it.
- **Width check on scalar reads** — libplctag never checks the CIP type the controller returns. A scalar atomic read whose buffer is not the authored type's width (e.g. a REAL authored as INT — the legacy Kepware export does exactly this for some press tags) reads `BadTypeMismatch` instead of Good garbage. Same-width mistakes (DINT vs REAL) are undetectable under libplctag; the `Native` transport reports them as `BadTypeMismatch` (see [Native transport behaviour](#native-transport-behaviour)).
- **Width check on scalar reads** — libplctag never checks the CIP type the controller returns. A scalar atomic read whose buffer is not the authored type's width (e.g. a REAL authored as INT — the legacy Kepware export does exactly this for some press tags) reads `BadTypeMismatch` instead of Good garbage. Same-width mistakes (DINT vs REAL) are undetectable under libplctag; the `Native` transport reports them as `BadTypeMismatch` (see [Native transport behaviour](#native-transport-behaviour)). The width-mismatch refusal is pinned by `AbCipTypeMismatchTests.A_width_mismatched_read_keeps_the_handle_leaves_health_alone_and_warns_once`: `BadTypeMismatch`, handle kept, no `Degraded`, one Warning per tag. *Benign edge (#585):* a driver left `Degraded` by an earlier outage whose only remaining tags are mis-typed gets one extra comms-loss-watchdog reconnect ~90 s later before settling, because a type refusal deliberately writes no health and so never clears the stale `Degraded`.
- **Module-defined I/O tags** — `Local:1:I.Data`, `ABB_OmniCore:I.ConnectionFaulted` and similar colon-bearing base names are valid tag paths (controller scope only).
- **User string arrays** — `STR0016[N]` and similar arrays stride by the actual element size (read buffer ÷ count); libplctag.NET 1.5.2 leaves `ElementSize` unset after a read.
- **Declaration-only UDT grouping is a footgun unless verified** — only enable `EnableDeclarationOnlyUdtGrouping` when every UDT's member declaration order has been hand-verified against the controller's compiled layout.