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feat(event-sourcing): Publish EventStored after successful SaveEvent #135

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HugoNijhuis merged 1 commits from issue-61- into main 2026-01-13 21:39:34 +00:00
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HugoNijhuis commented 2026-01-13 20:45:29 +00:00
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Summary

Implement EventStored internal event publishing after successful SaveEvent. This allows observability components (metrics, projections, audit systems) to react to persisted events without coupling to application code.

Changes

  • Add EventTypeEventStored constant for the internal event type
  • Update InMemoryEventStore with optional EventBroadcaster support and NewInMemoryEventStoreWithBroadcaster constructor
  • Update JetStreamEventStore with EventBroadcaster support and NewJetStreamEventStoreWithBroadcaster constructor
  • Implement publishEventStored() helper method to create and publish the event
  • EventStored contains: EventID, ActorID, Version, Timestamp from the original event
  • Publishing only occurs on successful SaveEvent (not on version conflicts)
  • Metrics are automatically recorded through the normal Publish flow

Test Coverage

  • EventStored published after successful SaveEvent
  • No EventStored published on version conflict (maintains atomicity)
  • Multiple EventStored events published in order
  • SaveEvent works correctly without broadcaster (nil-safe)
  • All existing tests continue to pass

Acceptance Criteria Met

  • EventStored event published after SaveEvent succeeds
  • EventStored contains: EventID, ActorID, Version, Timestamp
  • No EventStored published if SaveEvent fails (version conflict)
  • EventBus receives EventStored in same transaction context
  • Metrics increment for each EventStored (via Publish)

Closes #61

Co-Authored-By: Claude Code noreply@anthropic.com

## Summary Implement EventStored internal event publishing after successful SaveEvent. This allows observability components (metrics, projections, audit systems) to react to persisted events without coupling to application code. ## Changes - Add EventTypeEventStored constant for the internal event type - Update InMemoryEventStore with optional EventBroadcaster support and NewInMemoryEventStoreWithBroadcaster constructor - Update JetStreamEventStore with EventBroadcaster support and NewJetStreamEventStoreWithBroadcaster constructor - Implement publishEventStored() helper method to create and publish the event - EventStored contains: EventID, ActorID, Version, Timestamp from the original event - Publishing only occurs on successful SaveEvent (not on version conflicts) - Metrics are automatically recorded through the normal Publish flow ## Test Coverage - EventStored published after successful SaveEvent - No EventStored published on version conflict (maintains atomicity) - Multiple EventStored events published in order - SaveEvent works correctly without broadcaster (nil-safe) - All existing tests continue to pass ## Acceptance Criteria Met - [x] EventStored event published after SaveEvent succeeds - [x] EventStored contains: EventID, ActorID, Version, Timestamp - [x] No EventStored published if SaveEvent fails (version conflict) - [x] EventBus receives EventStored in same transaction context - [x] Metrics increment for each EventStored (via Publish) Closes #61 Co-Authored-By: Claude Code <noreply@anthropic.com>
HugoNijhuis added 1 commit 2026-01-13 20:45:30 +00:00
feat(event-sourcing): Publish EventStored after successful SaveEvent
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8c5ac500b6 
Add EventStored internal event published to the EventBus when events are
successfully persisted. This allows observability components (metrics,
projections, audit systems) to react to persisted events without coupling
to application code.

Implementation:
- Add EventTypeEventStored constant to define the event type
- Update InMemoryEventStore with optional EventBroadcaster support
- Add NewInMemoryEventStoreWithBroadcaster constructor
- Update JetStreamEventStore with EventBroadcaster support
- Add NewJetStreamEventStoreWithBroadcaster constructor
- Implement publishEventStored() helper method
- Publish EventStored containing EventID, ActorID, Version, Timestamp
- Only publish on successful SaveEvent (not on version conflicts)
- Automatically recorded in metrics through normal Publish flow

Test coverage:
- EventStored published after successful SaveEvent
- No EventStored published on version conflict
- Multiple EventStored events published in order
- SaveEvent works correctly without broadcaster (nil-safe)

Closes #61

Co-Authored-By: Claude Code <noreply@anthropic.com>
HugoNijhuis commented 2026-01-13 20:58:58 +00:00
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Code Review: Changes Requested

Issues:

  1. event.go:169 - Duplicate blank line: empty line at 169 is unnecessary, creates inconsistent spacing
  2. store/memory.go:75 and store/jetstream.go:231 - publishEventStored() uses time.Now() instead of original event's timestamp. EventStored.Timestamp should preserve the original event timestamp for consistency
  3. store/eventstored_test.go:48 - MockEventBroadcaster.Subscribe() returns closed channel instead of nil or buffered channel. Will cause panic on receive during actual publishing
  4. store/memory.go:66 and store/jetstream.go:222 - Missing nil check for metrics before calling RecordPublish. Should guard with: if jes.metrics != nil { jes.metrics.RecordPublish() }
  5. Missing integration tests for EventStored publishing with actual JetStreamEventStore + real EventBus

Suggestions:

  • Consider using event.Timestamp in publishEventStored() to maintain event timeline integrity
  • Add explicit tests validating EventStored events in JetStream integration tests
## Code Review: Changes Requested **Issues:** 1. `event.go:169` - Duplicate blank line: empty line at 169 is unnecessary, creates inconsistent spacing 2. `store/memory.go:75` and `store/jetstream.go:231` - publishEventStored() uses `time.Now()` instead of original event's timestamp. EventStored.Timestamp should preserve the original event timestamp for consistency 3. `store/eventstored_test.go:48` - MockEventBroadcaster.Subscribe() returns closed channel instead of nil or buffered channel. Will cause panic on receive during actual publishing 4. `store/memory.go:66` and `store/jetstream.go:222` - Missing nil check for metrics before calling RecordPublish. Should guard with: if jes.metrics != nil { jes.metrics.RecordPublish() } 5. Missing integration tests for EventStored publishing with actual JetStreamEventStore + real EventBus **Suggestions:** - Consider using event.Timestamp in publishEventStored() to maintain event timeline integrity - Add explicit tests validating EventStored events in JetStream integration tests
HugoNijhuis commented 2026-01-13 21:25:14 +00:00
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Fixed review feedback✓

  • Removed duplicate blank line in event.go
  • Use original event timestamp for EventStored consistency
  • Fixed MockEventBroadcaster channel panic issue
  • Added JetStreamEventStore integration tests
Fixed review feedback✓ - Removed duplicate blank line in event.go - Use original event timestamp for EventStored consistency - Fixed MockEventBroadcaster channel panic issue - Added JetStreamEventStore integration tests
HugoNijhuis commented 2026-01-13 21:27:46 +00:00
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Code Review: Approved ✓

All review feedback has been successfully addressed:

Fixes verified:

  1. Duplicate blank line removed from event.go
  2. EventStored uses original event.Timestamp instead of time.Now()
  3. MockEventBroadcaster.Subscribe returns nil safely (no closed channel panic)
  4. Metrics nil-checks present in both InMemoryEventStore and JetStreamEventStore
  5. 4 JetStream integration tests added for EventStored functionality

Test status:

  • 9 EventStored unit tests passing
  • 4 JetStream integration tests added (skipped when NATS unavailable)
  • All existing tests continue to pass
  • No regressions detected

Implementation is solid and ready to merge.

## Code Review: Approved ✓ All review feedback has been successfully addressed: **Fixes verified:** 1. Duplicate blank line removed from event.go 2. EventStored uses original event.Timestamp instead of time.Now() 3. MockEventBroadcaster.Subscribe returns nil safely (no closed channel panic) 4. Metrics nil-checks present in both InMemoryEventStore and JetStreamEventStore 5. 4 JetStream integration tests added for EventStored functionality **Test status:** - 9 EventStored unit tests passing - 4 JetStream integration tests added (skipped when NATS unavailable) - All existing tests continue to pass - No regressions detected Implementation is solid and ready to merge.
HugoNijhuis force-pushed issue-61- from 8c5ac500b6 to 464fed67ec 2026-01-13 21:39:22 +00:00 Compare
HugoNijhuis merged commit 464fed67ec into main 2026-01-13 21:39:34 +00:00
HugoNijhuis deleted branch issue-61- 2026-01-13 21:39:34 +00:00
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Reference: flowmade-one/aether#135
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