Validation runs on the actor thread (not off-thread as the plan sketched): piping
the verdict back to self reorders concurrent deploys relative to each other and to
delete/disable, breaking the redeploy-supersede FIFO ordering (SR020/SR029). A deploy
is an infrequent admin command, so a brief synchronous Roslyn compile is acceptable.
RouteDebugSnapshot and RouteDebugViewSubscribe on DeploymentManagerActor
previously returned an empty DebugViewSnapshot for unknown instances,
indistinguishable from a deployed-but-empty instance. Callers had no way
to differentiate "not deployed here" from "deployed, no data yet."
Approach — additive field on existing message contract:
Added `bool InstanceNotFound = false` as an optional trailing parameter
to DebugViewSnapshot (Commons). All existing positional constructor calls
and serialized wire frames are unaffected (default = false). A dedicated
new message type was considered but rejected: the ClusterClient channel
and DebugStreamService TCS are already typed on DebugViewSnapshot, and a
second reply union would require wider changes for zero additive-safety
gain.
Changes:
- Commons/DebugViewSnapshot: add InstanceNotFound = false (additive)
- DeploymentManagerActor: set InstanceNotFound=true in both unknown-
instance branches (RouteDebugViewSubscribe, RouteDebugSnapshot)
- DebugStreamBridgeActor: when snapshot.InstanceNotFound, forward it to
_onEvent (resolves the TCS) then stop cleanly; no gRPC stream opened
- DebugView.razor: check session.InitialSnapshot.InstanceNotFound after
connect and show a clear "not deployed on this site" error toast
- 3 new tests in DeploymentManagerActorTests covering: unknown→snapshot,
unknown→subscribe, known-empty→InstanceNotFound stays false
DeploymentManagerActor now fire-and-forgets a 'deployment' site operational
event on deploy/enable/disable/delete outcomes (Info on success, Error on
failure), source 'DeploymentManagerActor'. The disable/delete events are emitted
from the existing PipeTo continuations (safe: reads only the immutable
_serviceProvider and fire-and-forgets).
InstanceActor now emits an 'instance_lifecycle' Info event in PreStart (started)
and a new PostStop (stopped) — covering start/stop/enable/disable/redeploy/
failover transitions from the instance's own vantage point. Both actors already
hold _serviceProvider; no ctor change.
Resolution is optional and LogEventAsync is fire-and-forget so a logging failure
never affects the deployment pipeline or instance lifecycle.
Joseph Doherty