Replaces M1's NotSupportedException stub with the production drop-DROP-INDEX
→ CREATE-staging → SWITCH PARTITION → DROP-staging → CREATE-INDEX dance
documented in alog.md §4. UX_AuditLog_EventId is intentionally non-aligned
with ps_AuditLog_Month so single-column EventId uniqueness can be enforced
cheaply for InsertIfNotExistsAsync; SQL Server rejects ALTER TABLE SWITCH
while a non-aligned unique index is present, so the implementation drops
it, switches the partition data into a GUID-suffixed staging table on
[PRIMARY], drops staging (discarding the rows), and rebuilds the unique
index — all inside an explicit transaction with a CATCH that guarantees
the unique index is rebuilt regardless of failure point.
Also adds GetPartitionBoundariesOlderThanAsync to IAuditLogRepository: a
CROSS APPLY over sys.partition_range_values + per-partition MAX(OccurredAtUtc)
to enumerate retention-eligible months for the M6 purge actor (next commit).
Tests verify:
* Old partition's rows are removed; other months untouched
* UX_AuditLog_EventId is rebuilt after a successful switch
* InsertIfNotExistsAsync's first-write-wins idempotency still holds after switch
* On engineered SWITCH failure (inbound FK from a probe table), SqlException
propagates AND UX_AuditLog_EventId is still present (CATCH branch ran)
* GetPartitionBoundariesOlderThanAsync returns only boundaries whose partition's
MAX(OccurredAtUtc) is strictly older than the threshold; empty partitions
excluded
Bundle C task M5-T7 — surface DefaultAuditPayloadFilter redactor
over-redactions as a Site Health metric so a misconfigured /
catastrophic regex shows up on /monitoring/health rather than
disappearing into a NoOp sink.
- SiteHealthReport: new 'AuditRedactionFailure' int field
(defaulted to 0 for back-compat with existing producers/tests).
- ISiteHealthCollector / SiteHealthCollector:
new IncrementAuditRedactionFailure() — per-interval atomic
counter with Interlocked, reset on CollectReport, mirroring
the M2 Bundle G SiteAuditWriteFailures pattern.
- HealthMetricsAuditRedactionFailureCounter: new bridge in
ScadaLink.AuditLog.Site that forwards IAuditRedactionFailureCounter
increments to ISiteHealthCollector — mirrors
HealthMetricsAuditWriteFailureCounter one-for-one.
- AddAuditLogHealthMetricsBridge: now ALSO Replaces the
NoOpAuditRedactionFailureCounter binding with the health-metrics
bridge, so a single AddAuditLogHealthMetricsBridge() call wires
both the M2 Bundle G write-failure counter and the M5 Bundle C
redaction-failure counter into the health report.
Site-side only for M5 — the filter also runs on CentralAuditWriter
and AuditLogIngestActor (where it just keeps the NoOp default), but
a central-side health-metric surface for AuditRedactionFailure is
deferred to M6 alongside the rest of the central health collector
work.
Tests:
- AuditRedactionFailureMetricTests (HealthMonitoring) covers the
SiteHealthCollector increment/report/reset shape (3 tests).
- HealthMetricsAuditRedactionFailureCounterTests (AuditLog) covers
the AuditLog → HealthMonitoring bridge (3 tests).
- Existing CountCapturingHealthCollector stub in
DeploymentManagerRedeployTests extended with the new no-op
interface method.
Verified: dotnet build clean, all 24 test projects green
(the only Failed at first ScadaLink.SiteRuntime.Tests run was the
known-flaky InstanceActorChildAttributeRaceTests; passes on re-run
in isolation and full suite, unrelated to these changes).
Bundle C task M5-T6 — plugs the IAuditPayloadFilter singleton into the
three audit writer entry points so every event is truncated + redacted
before persistence, regardless of which path it took to disk:
- FallbackAuditWriter (site hot path): filter runs before the primary
SQLite write AND the ring-buffer enqueue, so a recovery drain replays
rows that are already capped/redacted.
- CentralAuditWriter (central direct-write): filter runs before the
per-call IAuditLogRepository.InsertIfNotExistsAsync.
- AuditLogIngestActor (site→central telemetry):
- OnIngestAsync resolves the filter from the per-message scope and
applies it to each row before IngestedAtUtc stamping.
- OnCachedTelemetryAsync (M3 dual-write) applies the filter to the
audit half of every CachedTelemetryEntry before the audit-insert
+ site-call-upsert transaction.
Filter parameter is optional (nullable) on each constructor so the
existing test composition roots that don't pass one keep working unchanged
— production DI wiring in AddAuditLog always passes the real filter
through. ICentralAuditWriter registration switched from the open-ctor
form to a factory so the filter flows through it.
Tests: FilterIntegrationTests covers all three writer paths end-to-end
(4 tests). Full ScadaLink.AuditLog.Tests suite: 146 passed, 0 failed,
0 skipped.
M4 Bundle B (B1) — add the central-only ICentralAuditWriter implementation
and inject it into NotificationOutboxActor so subsequent tasks (B2/B3) can
route attempt + terminal lifecycle events through the direct-write audit path.
- CentralAuditWriter: thin wrapper around IAuditLogRepository.InsertIfNotExistsAsync;
scope-per-call (matches AuditLogIngestActor / NotificationOutboxActor pattern);
stamps IngestedAtUtc; swallows all internal failures (alog.md §13).
- Registered as a singleton in AddAuditLog.
- NotificationOutboxActor ctor takes ICentralAuditWriter (validated non-null).
- Host wiring resolves the writer once from the root provider and passes it
into the singleton's Props.Create call.
- Existing TestKit fixtures updated with a NoOpCentralAuditWriter helper so
tests that don't exercise audit emission still compile and pass.
Wire the M3 cached-call audit pipeline end-to-end for the database
channel and close the loop between the S&F lifecycle observer and the
site-side dual emitter.
* DatabaseCachedWriteEmissionTests covers Database.CachedWrite (set up
in Bundle E3): mints a TrackedOperationId, emits one CachedSubmit
packet on DbOutbound, threads the id into IDatabaseGateway, and is
best-effort on a thrown forwarder. Mirrors ExternalSystem.CachedCall
coverage from E3.
* CachedCallLifecycleBridge (new) implements ICachedCallLifecycleObserver
and lives alongside CachedCallTelemetryForwarder. The bridge ingests
per-attempt notifications from the S&F retry loop and fans them out
to the forwarder:
- TransientFailure -> 1 Attempted row
- Delivered -> Attempted + CachedResolve(Delivered)
- PermanentFailure -> Attempted + CachedResolve(Parked)
- ParkedMaxRetries -> Attempted + CachedResolve(Parked)
Channel string -> AuditKind mapping (ApiOutbound->ApiCallCached,
DbOutbound->DbWriteCached). Best-effort top-level catch swallows any
unexpected throw so the S&F retry bookkeeping is never disturbed.
* Bridge tests (7) cover all four outcomes, channel mapping, provenance
propagation, and the no-throw-on-forwarder-failure contract.
Bundle F (Host registration) will instantiate the bridge and inject it
into StoreAndForwardService.cachedCallObserver, closing the wiring path
end-to-end.
Bundle E task E6.
Sister to SiteAuditTelemetryActor: takes a combined CachedCallTelemetry
packet and fans it out to the two site-local stores.
* AuditEvent half writes through IAuditWriter (the M2 FallbackAuditWriter
+ SqliteAuditWriter chain — same site SQLite hot-path as sync calls).
* SiteCallOperational half maps Audit.Kind to the matching
IOperationTrackingStore method:
- CachedSubmit -> RecordEnqueueAsync (insert-if-not-exists)
- ApiCallCached / DbWriteCached -> RecordAttemptAsync (monotonic)
- CachedResolve -> RecordTerminalAsync (first-write-wins)
Best-effort contract (alog.md §7): independent try/catch per half so a
thrown writer cannot starve the tracking row (and vice-versa); both
failures are logged at warning level and swallowed — the calling script
never sees them.
Wire push deferred to M6 — the NoOp ISiteStreamAuditClient binding stays
in effect; the forwarder writes only to the local stores in M3. The
existing SiteAuditTelemetryActor drain loop will sweep the audit rows
once a real gRPC client lands.
Bundle E task E2.
Add the second site→central RPC seam alongside the existing M2
IngestAuditEventsAsync. The Bundle D proto already lit up
IngestCachedTelemetry (CachedTelemetryBatch / IngestAck) so this commit
just plumbs the client-side abstraction:
* ISiteStreamAuditClient gains IngestCachedTelemetryAsync(batch, ct).
* NoOpSiteStreamAuditClient implements it returning an empty IngestAck
(same shape as M2 — production gRPC client lands in M6).
* SyncCallEmissionEndToEndTests' DirectActorSiteStreamAuditClient stub
throws NotSupportedException from the new method so a regression that
accidentally routes a cached packet through the sync stub fails loudly.
* New NoOpSiteStreamAuditClientTests cover the null-guard + empty-ack
contract for both batch shapes.
Bundle E task E1.
Bundle G of Audit Log #23 M2. Bridges the FallbackAuditWriter primary-
failure counter into the Site Health Monitoring report payload so a
sustained audit-write outage surfaces on /monitoring/health instead of
disappearing into a NoOp sink.
- SiteHealthReport: add SiteAuditWriteFailures (defaulted, additive).
- ISiteHealthCollector + SiteHealthCollector: new
IncrementSiteAuditWriteFailures() counter, per-interval reset
semantics matching ScriptErrorCount / DeadLetterCount.
- HealthMetricsAuditWriteFailureCounter: adapter forwarding
IAuditWriteFailureCounter.Increment() to the collector.
- AddAuditLogHealthMetricsBridge(): swaps the NoOp default
registration for the real bridge; called from
SiteServiceRegistration after AddSiteHealthMonitoring + AddAuditLog.
- Existing host-wiring test updated: site composition now resolves
HealthMetricsAuditWriteFailureCounter (not NoOp).
Tests: HealthMonitoring 60 -> 63 (3 new), AuditLog 56 -> 59 (3 new),
full solution green.
Wires Bundle E of the M2 site-sync pipeline:
- AddAuditLog extended to register the site writer chain (SqliteAuditWriter
singleton + ISiteAuditQueue forward + RingBufferFallback + FallbackAuditWriter
composing them) and the telemetry collaborators (SiteAuditTelemetryOptions,
SqliteAuditWriterOptions, IAuditWriteFailureCounter NoOp default,
ISiteStreamAuditClient NoOp default).
- AkkaHostedService central role: AuditLogIngestActor as ClusterSingletonManager
(singleton name 'audit-log-ingest') + ClusterSingletonProxy, mirroring the
Notification Outbox pattern. Proxy is offered to SiteStreamGrpcServer if it
resolves (Site path only today; M6 reconciliation will host gRPC on central).
- AkkaHostedService site role: SiteAuditTelemetryActor (per-site, NOT a
singleton because each site is its own cluster), bound to a dedicated
audit-telemetry-dispatcher (ForkJoinDispatcher, 2 dedicated threads).
- Program.cs + SiteServiceRegistration.Configure call AddAuditLog on both roles.
- AuditLogIngestActor gains a second constructor that takes IServiceProvider so
the cluster singleton can create a fresh scope per message — IAuditLogRepository
is a scoped EF Core service and cannot be pre-resolved from the root. The
IAuditLogRepository constructor remains for Bundle D's MSSQL-fixture tests.
NoOp ISiteStreamAuditClient is deliberate: no site→central gRPC channel exists
in M2 (sites talk to central via Akka ClusterClient; gRPC SiteStreamService is
hosted on sites for central→site streaming). M6 reconciliation introduces the
real gRPC site→central client + central-hosted gRPC server. Bundle H's
integration test substitutes a stub client directly via the actor's Props.
Tests:
- tests/ScadaLink.AuditLog.Tests/AddAuditLogTests.cs — 11 tests (was 3): writer
singleton, IAuditWriter as FallbackAuditWriter, ISiteAuditQueue same-instance
as SqliteAuditWriter, options bind round-trip, NoOp default assertions.
- tests/ScadaLink.Host.Tests/AkkaHostedServiceAuditWiringTests.cs (new) — 13
tests: BuildHocon emits audit-telemetry-dispatcher block with the expected
type/throughput/thread-count; Central composition root resolves the writer
chain + options; Site composition root resolves the writer chain + options +
NoOp client.
Verified: dotnet build clean, 23 test suites green (Host 194 + AuditLog 54).
Adds the IAuditWriter composer that sits between the script-side
ScriptRuntimeContext audit emission (Bundle F) and the primary
SqliteAuditWriter. Honours the alog.md §7 guarantee that audit-write
failures NEVER abort the user-facing action:
- Primary throw -> log Warning, increment IAuditWriteFailureCounter
(Bundle G's health-metric sink), stash the event in the drop-oldest
RingBufferFallback, return success to the caller.
- Primary success -> opportunistically drain the ring back through the
primary in FIFO order, behind the triggering event. Drain is
serialised via a SemaphoreSlim gate so concurrent recoveries don't
double-replay; a drain-side re-throw re-enqueues at the tail and
breaks out (the next successful write retries).
Adds IAuditWriteFailureCounter as the lightweight DI seam (one void
Increment()), and a TryDequeue helper on RingBufferFallback that the
recovery path uses to pop one item without blocking.
Tests (4 new, total 26 -> 30):
- WriteAsync_PrimaryThrows_EventLandsInRing_CallReturnsSuccess
- WriteAsync_PrimaryRecovers_RingDrains_InFIFOOrder_OnNextWrite
(order: trigger first, then ring backlog in submission FIFO)
- WriteAsync_PrimaryAlwaysSucceeds_Ring_StaysEmpty
- WriteAsync_FailureCounter_Incremented_Per_PrimaryFailure
Adds RingBufferFallback — an in-memory drop-oldest ring buffer used by
the upcoming FallbackAuditWriter (Bundle B-T4) when the primary SQLite
writer is throwing. Backed by Channel<AuditEvent> with
BoundedChannelFullMode.DropOldest, fixed capacity (default 1024).
Channel.CreateBounded(DropOldest) does NOT natively signal a drop on
TryWrite, so overflow is detected by comparing Reader.Count before and
after the enqueue: when the buffer is already at capacity and a new
TryWrite succeeds while keeping the count at capacity, exactly one
event was displaced and RingBufferOverflowed is raised (one event per
drop).
Public surface:
- bool TryEnqueue(AuditEvent) — always succeeds unless completed.
- IAsyncEnumerable<AuditEvent> DrainAsync(CancellationToken) — FIFO.
- void Complete() — closes the channel so DrainAsync can finish.
- event Action? RingBufferOverflowed — health counter hook.
Tests (3 new, total 23 -> 26):
- Enqueue_1025_Into_1024Cap_Ring_DropsOldest_AndRaisesOverflowOnce
- DrainAsync_Yields_FIFO_Then_Completes_When_Empty
- TryEnqueue_AllSucceeds_ReturnsTrue
Replaces the B-T1 stub WriteAsync with the production hot-path:
- Bounded Channel<PendingAuditEvent> (BoundedChannelFullMode.Wait, capacity
from options) feeds a background ProcessWriteQueueAsync loop that drains
up to BatchSize events per transaction.
- The loop INSERTs each event with explicit parameter binding (enums and
DateTime stored as text); duplicate EventIds (SqliteException with
ErrorCode 19 SQLITE_CONSTRAINT) are swallowed as first-write-wins per
alog.md §11, and the pending TCS is still completed successfully so
callers see idempotent semantics.
- Site rows force ForwardState = Pending on enqueue when the inbound
event leaves it null — site-side default per the M2 design.
- ReadPendingAsync(limit) returns oldest-first pending rows for the
Bundle D telemetry actor; EventId is the deterministic tiebreaker on
identical OccurredAtUtc timestamps. MarkForwardedAsync(ids) flips a
batch to Forwarded in one UPDATE with a parameterised IN list.
- IAsyncDisposable graceful shutdown: TryComplete the writer, await the
drain (5s budget), then dispose the connection.
Tests (7 new, total 16 -> 23):
- WriteAsync_FreshEvent_PersistsWithForwardStatePending
- WriteAsync_Concurrent_1000Calls_All_Persist_NoExceptions
- WriteAsync_DuplicateEventId_FirstWriteWins_NoException
- WriteAsync_ForcesForwardStatePending_IfNull
- ReadPendingAsync_Returns_OldestFirst_LimitedToN
- MarkForwardedAsync_FlipsRowsToForwarded
- MarkForwardedAsync_NonExistentId_NoThrow
