Task 5 review follow-ups:
- New DebugViewInstancePickerTests.WhileConnected_ThePickerIsDisabled pins that
a live connection locks the picker: both the input and the chevron carry
`disabled`. It marks the page connected by reflection, the way the other
DebugView page tests do (DebugViewAlarmTableTests) — driving the real gRPC
stream is not available to a bUnit render.
- OnInstanceSelectionChanged() was already a no-op and its comment described the
@bind that the picker replaced; deleted, and OnInstancePicked now just records
the id (XML-documented).
- The ItemLabel lambda is hoisted to a private static InstanceLabel(Instance),
passed as a method group.
Claude-Session: https://claude.ai/code/session_01NcMG6xXdsJbmD2wYAgkK29
The flat instance <select> on Debug View is replaced by the shared
InstancePicker area-tree combobox (design 2026-09-08 §3): the page now loads
the site's areas alongside its Enabled instances in LoadInstancesForSite and
hands both lists to the picker with ItemLabel = "UniqueName (State)",
Disabled="@_connected" and DataTestPrefix="debug-instance".
Both lists are now REPLACED rather than cleared in place wherever the site
changes (LoadInstancesForSite, StartFresh) — the picker compares Areas and
Instances by reference and a new object is what tells it the site changed.
The ?siteId=/?instanceId= deep link and the localStorage reconnect keep
setting _selectedInstanceId directly; the picker reads it on parameter set,
so both paths are unchanged.
Claude-Session: https://claude.ai/code/session_01NcMG6xXdsJbmD2wYAgkK29
A debug-stream session created after the consumer had already gone away was
leaked permanently. Both consumers awaited StartStreamAsync (up to 30s) and only
then published the session; a circuit teardown / client disconnect inside that
window ran the release path first, found nothing registered and stopped nothing.
The session stayed registered in the singleton DebugStreamService, whose
keepalive renews registered sessions forever (the 5-minute orphan reaper only
collects UNregistered ones), pinning the site gRPC subscription, the
DebugStreamBridgeActor and the dead consumer's object graph until process
restart.
Both call sites now publish the session and re-check liveness under a single
monitor, so exactly one side tears it down and neither can miss it:
- DebugView.Connect/Dispose/Disconnect share a _sessionLock; Dispose sets
_disposed and takes the session in one step, Connect publishes only if not
disposed and otherwise stops the session it just created. Dispose can run off
the renderer's thread, so the Blazor sync context is not relied on. Disconnect
and the onTerminated callback go through the same take-once helper, which also
makes a repeated Dispose stop-once instead of stop-again.
- DebugStreamHub uses the per-connection Items monitor: OnDisconnectedAsync marks
the connection gone before releasing, SubscribeInstance publishes only if
neither that flag nor ConnectionAborted is set, and UnsubscribeInstance takes
the id atomically.
DebugStreamService.StartStreamAsync/StopStream become virtual purely as a test
seam (no behaviour change, keepalive/orphan contract untouched) so the race can
be driven deterministically by a gated stub.
Tests: DebugViewConnectDisposeRaceTests (3) + DebugStreamHubSubscribeRaceTests
(3). Verified fail-unfixed: with the two source fixes stashed, both
dispose-mid-start tests report zero StopStream calls and the DebugView
double-dispose test reports two.
Replace the two flat capped tables with a Bootstrap nav-tabs layout, each
tab hosting a TreeView<DebugTreeNode> built from the live latest-per-name
dictionaries via DebugTreeBuilder. Drop the MaxRows cap, auto-scroll locks,
and Clear buttons (change-feed affordances that don't fit a current-status
tree); HandleStreamEvent now does a plain dictionary upsert. Per-tab filters
ExpandAll on change so matches stay visible. Branch nodes surface roll-up
badges (active-count for alarms, bad-quality for attributes); native binding
nodes show active-count or 'no active conditions'. All existing badge helpers
and ValueFormatter reused. Marshalling/dispose/reconnect contract preserved
(SafeInvokeAsync/_disposed/Dispose unchanged; FilteredAttributeValues kept as
the render-thread dict reader the CentralUI-021 race test exercises).
Rework DebugViewAlarmTableTests for the tabbed-tree DOM: tab presence+default,
computed alarm grouped under its Motor1 branch with the active roll-up badge,
and a native condition nested under its source-binding node with the enriched
kind/severity/Unacked/Shelved badge set.
- Add DebugStreamBridgeActorTests: On_InstanceNotFound_Snapshot_Forwards_To_OnEvent_Does_Not_Open_Stream_And_Terminates — asserts _onEvent receives the not-found snapshot, SubscribeCalls remains empty, and the actor terminates cleanly via Watch/ExpectTerminated.
- Add comment in DebugStreamBridgeActor near Context.Stop(Self) explaining that the subsequent StopDebugStream Tell from DebugStreamService.StopStream produces a benign expected dead-letter.
- Reword not-found toast in DebugView.razor to "Instance not found on the selected site — check the deployment target." (accurate when the instance may be deployed to a different site).
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
Joseph Doherty