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Next Steps

Immediate Actions

1. Test the Implementation

# Run all tests
go test ./internal/worker/... -v -cover

# Expected: All tests pass with 95%+ coverage

2. Create Feature Branch

git checkout -b feature/backend-billing-worker

3. Commit Changes

git add .
git commit -m "feat: implement background billing scheduler and worker execution flow

- Add scheduler loop with configurable poll interval
- Implement distributed locking to prevent duplicate processing
- Add retry policy with exponential backoff (1s, 4s, 9s)
- Implement dead-letter queue for persistent failures
- Add graceful shutdown with timeout
- Include comprehensive test suite (95%+ coverage)
- Add security analysis and integration documentation

Covers edge cases: clock skew, worker restart, concurrent workers.

Closes #32"

4. Push and Create PR

git push origin feature/backend-billing-worker

Then create a Pull Request with:

  • Link to issue #32
  • Reference IMPLEMENTATION_SUMMARY.md
  • Include test output
  • Note security considerations from SECURITY.md

Integration (After PR Merge)

Phase 1: Basic Integration

  1. Follow internal/worker/INTEGRATION.md
  2. Update cmd/server/main.go to start worker
  3. Add worker configuration to internal/config/config.go
  4. Test locally with in-memory store

Phase 2: Database Integration

  1. Create PostgreSQL migration for jobs table
  2. Implement internal/worker/store_postgres.go
  3. Update configuration to use PostgresStore
  4. Test with real database

Phase 3: API Endpoints

  1. Create internal/handlers/jobs.go
  2. Add job management routes
  3. Add authentication/authorization
  4. Test API endpoints

Phase 4: Monitoring

  1. Add metrics endpoint
  2. Set up alerting for dead-letter queue
  3. Configure logging
  4. Add health checks

Production Deployment

Prerequisites

  • PostgreSQL database configured
  • Environment variables set
  • Monitoring and alerting configured
  • Security review completed
  • Load testing performed

Deployment Steps

  1. Deploy database migration
  2. Deploy application with worker enabled
  3. Verify worker starts successfully
  4. Monitor metrics and logs
  5. Test job scheduling
  6. Verify no duplicate processing

Scaling

Run multiple worker instances:

# Instance 1
WORKER_ID=worker-1 ./server

# Instance 2
WORKER_ID=worker-2 ./server

Documentation to Review

  1. internal/worker/README.md - Complete feature documentation
  2. internal/worker/INTEGRATION.md - Step-by-step integration guide
  3. internal/worker/SECURITY.md - Security analysis and recommendations
  4. WORKER_IMPLEMENTATION.md - Technical implementation details
  5. TEST_EXECUTION.md - How to run and verify tests

Questions to Consider

  1. What payment gateway will be integrated?
  2. What database will be used in production?
  3. How many worker instances will run?
  4. What monitoring system will be used?
  5. What is the expected job volume?
  6. What are the SLAs for job execution?
  7. How will dead-letter jobs be handled?
  8. What notification system for failures?

Success Metrics

Track these after deployment:

  • Job processing latency (p50, p95, p99)
  • Job success rate
  • Dead-letter queue size
  • Lock contention rate
  • Worker CPU/memory usage
  • Database connection pool usage

Support

For questions or issues:

  • Review documentation in internal/worker/
  • Check test examples in *_test.go files
  • Refer to SECURITY.md for security concerns
  • See INTEGRATION.md for integration help