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feat(grpc): route ReadEvents over gRPC + extract shared CM_EVENT registration

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Adds HistorianGrpcEventOrchestrator: opens a read-only gRPC session, replays the
CM_EVENT registration (UpdateClientStatus -> 6 GetSystemParameter -> RegisterTags
-> cross-service version probes -> EnsureTags), then StartEventQuery -> loop
GetNextEventQueryResultBuffer -> EndEventQuery, reusing the WCF query builder and
row parser verbatim. Routed in Historian2020ProtocolDialect on UseGrpc.

The captured registration buffers (CmEventTagId, UpdC3 blob, RTag2 buffer, GETHI
builder, pre-register param list, native-error decode) are extracted into a shared
HistorianEventRegistrationProtocol so the WCF and gRPC paths can't drift; the WCF
orchestrator is refactored onto it with no behavior change.

Live finding (2026-06-22): the chain runs and StartEventQuery succeeds, but the
gRPC server long-polls GetNextEventQueryResultBuffer on no data (it blocks to the
deadline instead of returning the synchronous 5-byte code-85 terminal the WCF op
returns). Per-call gRPC-Web deadlines proved unreliable over a tunnel, so the read
is hard-bounded by an overall linked-CTS budget (<=30s; gRPC honors token
cancellation). On the no-row path it throws ProtocolEvidenceMissingException rather
than assert a false-empty list. Row-level retrieval awaits an event-bearing 2023 R2
server (the dev box holds no events).

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
2026-06-22 04:58:25 -04:00
parent 2d69f2860e
commit f1fd3691ba
4 changed files with 497 additions and 87 deletions
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src/AVEVA.Historian.Client/Protocol/Historian2020ProtocolDialect.cs
+3 -2
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@@ -44,8 +44,9 @@ internal sealed class Historian2020ProtocolDialect
public IAsyncEnumerable<HistorianEvent> ReadEventsAsync(DateTime startUtc, DateTime endUtc, HistorianEventFilter? filter, CancellationToken cancellationToken)
{
HistorianWcfEventOrchestrator orchestrator = new(_options);
return orchestrator.ReadEventsAsync(startUtc, endUtc, filter, cancellationToken);
return UseGrpc
? new HistorianGrpcEventOrchestrator(_options).ReadEventsAsync(startUtc, endUtc, filter, cancellationToken)
: new HistorianWcfEventOrchestrator(_options).ReadEventsAsync(startUtc, endUtc, filter, cancellationToken);
}
public Task<HistorianConnectionStatus> GetConnectionStatusAsync(CancellationToken cancellationToken)