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R1.4 GetHistorianInfo: bounded out on 2020 WCF (named-value-only, no struct)

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Captured the native HistorianAccess.GetHistorianInfo(out HistorianInfo, out err)
and decoded the wire: over 2020 WCF, GETHI is a named-value query whose only
working key is "HistorianVersion" (response ~30 bytes = the version string).
Probed 7 storage-mode key names -> all ok=False/err. The 518-byte HISTORIAN_INFO
struct + EventStorageMode@514 is the 2023R2 HCAL-native/gRPC model (confirmed
from the decompiled 2023R2 source); on 2020 the native client derives the mode
outside the WCF wire.

Version is already exposed (ProbeAsync/GetRuntimeParameterAsync), so no hollow
GetHistorianInfoAsync is shipped (same disposition as R1.3 timezone). This
completes the reachable 2020-WCF M1 read surface; remaining M1 = config writes
(gated on explicit request) or gRPC/2023R2-only items.

RE aids kept: harness `historian-info` scenario, Capture-HistorianInfo.ps1,
decode-historian-info-capture.py, and StringHandleProbeDiagnosticTests
.GETHI_CandidateInfoNames (asserts the named-value-only finding; gated).
Docs: wcf-historian-info.md (new) + roadmap/matrix/wall-doc updates. 230 tests green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01B6mcaT2PjRFKcogzp9UkfC
This commit is contained in:
Joseph Doherty
2026-06-20 23:42:27 -04:00
parent 1a539882d0
commit fbd839077b
8 changed files with 441 additions and 7 deletions
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docs/plans/hcal-capability-matrix.md
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@@ -99,7 +99,7 @@ blob needs RE).
|---|---|---|---|---|---|
| System parameter | `GetSystemParameter` | `Status.GetSystemParameter` | ✅ | DONE | |
| Runtime parameter | `GetRuntimeParameter` | `Status.GetRuntimeParameter` | ⬜ | TRIVIAL | same shape as GetSystemParameter |
| Historian info | `GetHistorianInfo` | `Status.GetHistorianInfo` | 🟗 | BOUNDED | GETHI buffer; partially decoded (incl. EventStorageMode @ offset 514) |
| Historian info | `GetHistorianInfo` | `Status.GetHistorianInfo` | 🟗 | BOUNDED | **2020 WCF = version-only** (GETHI is a named-value query; `EventStorageMode` not on the wire). 518-byte struct + `EventStorageMode`@514 is gRPC/2023R2-only. See `wcf-historian-info.md` |
| Server timezone | `GetSystemTimeZoneInfo` | `Status.GetSystemTimeZoneName` | ⬜ | TRIVIAL | |
| Historization status | `GetHistorizationStatus` | `Status` op | ⬜ | BOUNDED | |
| Store-and-forward status | `GetStoreForwardStatus` | (push events / pull GETHI) | 🟗 | HARD | currently synthesized; real read needs duplex push or a decoded pull endpoint — see store-forward plan |
docs/plans/hcal-roadmap.md
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@@ -41,10 +41,14 @@ HCAL replacement, built on the **2023 R2 gRPC transport**. Derived from
> (✅ 2026-06-20 — `ReadEventsAsync(…, HistorianEventFilter)`, live-honored). M2 event send is
> also done (✅ WCF `AddS2`). **R1.2 `GetRuntimeParameterAsync` is also done** (✅ 2026-06-20,
> `aa/Stat/GETRP`, live-verified) — notably a *string-handle* op that punches through the wall
> using the Open2 storage-session GUID as an **uppercase** string handle, which is a strong lead
> that the GETHI/ExeC failures are (at least partly) a handle-*format* issue rather than only a
> missing native registration. **Cheap high-value follow-up: retry GETHI/ExeC with the uppercased
> storage GUID** before assuming the registration wall (see `wcf-string-handle-wall.md` §Update).
> using the Open2 storage-session GUID as an **uppercase** string handle, which proved the
> GETHI/ExeC failures were a handle-*format* issue rather than a missing native registration.
> **Follow-up done:** R1.1 `ExecuteSqlCommandAsync` shipped; R1.5 extended-property read shipped
> (R1.6 collapsed into it — no distinct localized op). **R1.4 `GetHistorianInfo` bounded out on
> 2020 WCF** — GETHI there is a named-value query (only `HistorianVersion`); `EventStorageMode` is
> 2023R2-gRPC-only (see `wcf-historian-info.md`). Net: the **reachable 2020-WCF M1 read surface is
> complete**; what remains is config *writes* (M1c — gated on an explicit user request) and the
> gRPC/2023R2-only items (R1.3 timezone, R1.4 EventStorageMode — need a live 2023 R2 server).
## Guiding principles
@@ -106,7 +110,7 @@ read/browse/status surface is Windows-free and the gRPC stack is the default pat
### 1b. Bounded (decode one `bytes` payload; S–M each)
| ID | Capability | gRPC op | Payload to decode | Depends |
|---|---|---|---|---|
| R1.4 | `GetHistorianInfoAsync` | `Status.GetHistorianInfo` (`GETHI`) | ✅ **REACHABLE (2026-06-20, live-probed)** via the uppercase storage GUID — `GETHI` returns data (`StringHandleProbeDiagnosticTests`). The version-keyed request returns `uint charCount + UTF-16`; the full info struct (incl. `EventStorageMode`@514) needs its own request capture. **Public API not yet shipped.** | uppercase string handle |
| R1.4 | `GetHistorianInfoAsync` | `Status.GetHistorianInfo` (`GETHI`) | ⚠ **Bounded out on 2020 WCF (2026-06-20) — `EventStorageMode` not on the wire; version-only.** Captured the native `GetHistorianInfo(out HistorianInfo, out err)`: over 2020 WCF, `GETHI` is a **named-value query** whose only working key is `HistorianVersion` (returns `uint charCount + UTF-16` version, ~30 bytes). Probed 7 storage-mode key names → all `ok=False`/err. The 518-byte `HISTORIAN_INFO` struct + `EventStorageMode`@514 is the **2023R2 HCAL-native/gRPC** model (confirmed from the decompiled 2023R2 source); on 2020 the native client derives `EventStorageMode` **outside the WCF wire**. Version is already exposed (`ProbeAsync`/`GetRuntimeParameterAsync`), so **not shipped** here — same status as R1.3. Ship `HistorianInfo`/`HistorianEventStorageMode` on the gRPC path against a live 2023 R2 server. RE aids: `scripts/Capture-HistorianInfo.ps1`, `scripts/decode-historian-info-capture.py`, harness `historian-info` scenario, `StringHandleProbeDiagnosticTests.GETHI_CandidateInfoNames`. See `docs/reverse-engineering/wcf-historian-info.md`. | gRPC/2023R2 |
| R1.5 | Extended-property **read** | `Retrieval.GetTagExtendedPropertiesFromName` | 🟡 **Likely reachable** via uppercase string handle (GetTepByNm family) — not yet individually re-probed. TEP result buffer. | uppercase string handle |
| R1.6 | Localized-property **read** | `Retrieval.GetTagLocalizedPropertiesFromName` | 🟡 **Likely reachable** (same family) — not yet re-probed. | uppercase string handle |
| ~~R1.7~~ | Event **filters** | filter bytes in `Retrieval.StartEventQuery` | ✅ **DONE (2026-06-20), live-honored.** `ReadEventsAsync(start, end, HistorianEventFilter)`. The filter rides `StartEventQuery`'s `pRequestBuff` (captured via `EventQuery.AddEventFilter` + instrument-wcf-writemessage; Equal vs Contains diffed to isolate the op). Filter block: `ushort 0 + uint filterCount + uint condCount + uint nameLen + name(UTF-16) + uint 1 + ushort op + uint 1 + value(0x09-len-0x00 compact-ASCII) + byte 0`. **REAL, not inert** (a non-matching predicate returns 0 events; matching returns the subset). Single string-valued predicate only; multi-filter (OR) / multi-condition (AND via `AddEventFilterCondition`) framing not yet fully captured. See `HistorianEventFilter`, golden `WcfEventQueryProtocolTests`. | — |