feat(pubsub): implement PubSubQueue for horizontal scaling#19
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Added detailed phase for PubSubQueue implementation: - Async bridge pattern (sync Pub/Sub callback → asyncio.Queue → async workers) - JSON serialization for simplicity and consistency - Dual DLQ (Pub/Sub DLQ + ErrorStore) - Resource management for dev/test environments - Complete code patterns and design decisions Estimated: 7-9 hours Dependencies: Phase 4 (Processor, EventQueue protocol)
- Add PubSubQueue implementing EventQueue protocol - Async bridge: Pub/Sub sync callbacks → asyncio processing pipeline - Configurable workers, topic/subscription management - DLQ support with max delivery attempts - Graceful shutdown with queue draining - 96% code coverage with comprehensive unit tests - Mocked PublisherClient/SubscriberClient for fast unit testing
- Update create_queue() to support PUBSUB mode - Export PubSubQueue from queues package - Update factory tests to verify PubSubQueue creation - All 25 queue tests passing
- Add pubsub-emulator service to docker-compose.yml - Create comprehensive integration tests for PubSubQueue: * End-to-end publish → subscribe → process * Multiple workers parallel processing * Graceful shutdown with queue draining * Message acknowledgment (no redelivery) * Resource creation (topics/subscriptions) - Update CI workflow to start Pub/Sub emulator - Add PUBSUB_EMULATOR_HOST to test environment - All 5 integration tests passing
- Update LOCAL_DEV.md: Add Pub/Sub emulator setup, queue mode options - Update CLAUDE.md: Add Pub/Sub async bridge pattern, command updates - Update tasks.md: Mark Task 16 (PubSubQueue) as complete - Document sync-to-async bridge using asyncio.run_coroutine_threadsafe - Add queue mode configuration examples for all three modes
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Summary
Implements to enable horizontal scaling of event processing using Google Cloud Pub/Sub.
Changes
Core Implementation (4 commits):
PubSubQueue Implementation: Full async queue with Pub/Sub integration
asyncio.run_coroutine_threadsafeFactory Integration: Updated
create_queue()to supportEVENTKIT_QUEUE_MODE=pubsubCI & Integration Tests:
Documentation:
LOCAL_DEV.mdwith Pub/Sub setup, queue modes, test isolationCLAUDE.mdwith async bridge patterntasks.mdTest Coverage
Configuration
New environment variables:
EVENTKIT_QUEUE_MODE=pubsub(enable Pub/Sub queue)EVENTKIT_PUBSUB_TOPIC(default: eventkit-events)EVENTKIT_PUBSUB_SUBSCRIPTION(default: eventkit-worker)EVENTKIT_PUBSUB_DLQ_TOPIC(default: eventkit-events-dlq)EVENTKIT_PUBSUB_WORKERS(default: 4)EVENTKIT_PUBSUB_MAX_DELIVERY_ATTEMPTS(default: 5)Closes #18