Joseph Doherty 9b21ca3554 A.3 (gateway dispatcher): WorkerAlarmRpcDispatcher routes alarm RPCs over the worker pipe
Replaces NotWiredAlarmRpcDispatcher in DI with a production
implementation that issues the new MxCommandKind.{AcknowledgeAlarm,
QueryActiveAlarms} commands across the IPC and unwraps the resulting
MxCommandReply into the public RPC types.

QueryActiveAlarms is fully wired: builds the QueryActiveAlarmsCommand
(forwarding alarm_filter_prefix), invokes it on the resolved
GatewaySession's worker client, and yields each ActiveAlarmSnapshot
from the QueryActiveAlarmsReplyPayload as the RPC stream. Worker
failures + missing sessions yield an empty stream — matches the
ConditionRefresh contract clients already speak to.

AcknowledgeAlarm is partially wired: the public RPC takes
AlarmFullReference (Provider!Group.Tag), but the worker's wnwrap
consumer acks by GUID. Strategy:
- If AlarmFullReference parses as a canonical GUID, forward it
  directly through MxCommandKind.AcknowledgeAlarm. Native status
  flows back via MxCommandReply.Hresult and the dedicated
  AcknowledgeAlarmReplyPayload.NativeStatus.
- Otherwise, return InvalidRequest with a clear diagnostic naming the
  follow-up — reference→GUID lookup needs a worker-side AlarmAckByName
  command wrapping wwAlarmConsumerClass.AlarmAckByName.

DI: SessionServiceCollectionExtensions registers WorkerAlarmRpcDispatcher
as the default IAlarmRpcDispatcher; MxAccessGatewayService picks it up
via constructor injection. NotWiredAlarmRpcDispatcher is retained for
test fixtures that want the no-side-effect fake.

Tests: 7 new unit tests cover session-not-found short-circuit, GUID-vs-
reference branching, native-status propagation, worker MxaccessFailure
diagnostic propagation, and snapshot-stream yielding. Server test
suite total: 288/0 fail. Solution builds clean.

End-to-end alarms-over-gateway pipeline status:
  consumer → sink → queue (A.2 + A.3 in-process slice)
  worker IPC commands (A.3 worker slice)
  gateway dispatcher (this slice)

Remaining for full E2E:
  - Auto-issue SubscribeAlarms on session open (or add a public
    SubscribeAlarms RPC). Without this trigger the consumer never
    starts and Acknowledge/Query return "not subscribed".
  - AlarmAckByName worker command for ack-by-reference.
  - End-to-end live test against the dev rig.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-01 10:58:40 -04:00
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