Implemented HistorianWcfRevisionOrchestrator that talks WCF directly
to /Trx, bypassing the native wrapper entirely. Probes
AddNonStreamValuesBegin2 against the live local Historian and surfaces
what the server returns. Internal-only API; no public surface added —
the path isn't viable yet.
Findings (live test against localhost):
- ✅ The wire path is reachable. After moving from V1 (uint handle, no
errorBuffer) to V2 (string handle GUID, out errorBuffer), the server
recognizes the call (no ContractFilter mismatch, no exception).
- ✅ Server processes the call and returns a structured 5-byte error
buffer: 04 33 00 00 00 = type 4 (CustomError) + code 51
(UnknownClient).
- ❌ Tried four handle formats (contextKey upper/lower, storageSessionId
upper, ClientHandle as decimal string) — all return the same
UnknownClient.
- ❌ Adding the full priming chain (Stat.GetV ×2, Stat.GETHI ×2, UpdC3,
6× Stat.GetSystemParameter, AllowRenameTags, Trx.GetV, Stat.GetV,
Retr.GetV) — same result.
ITransactionServiceContract2 has no Validate/Register/Open op of its
own. The client-with-Trx registration must happen via some cross-
service side effect we haven't isolated.
Important takeaway: the wire-format mismatch is solved (contract method
names + parameter shapes match what the server expects). The remaining
gap is a single missing initialization step. Documented in
docs/plans/revision-write-path.md as concrete next-session steps.
178/178 tests pass (one new probe test added). Probe is gated on
HISTORIAN_HOST=localhost.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Joseph Doherty
b40e6948e2