Migrate QAB Buy Web Services to Serverless
Proposal to migrate legacy Qab buy web services to QabBuy serverless stack
Summary
Proposal to migrate legacy Qab buy web services to a modern serverless architecture using the QabBuy serverless stack.
Rationale
[To be filled in - reasons for migrating to serverless]
Key benefits expected:
- Modernize legacy infrastructure
- Improved scalability and reliability
- Reduced maintenance burden
- Cost optimization
- Enhanced deployment practices
- Better handling of peak purchase volumes
Affected Applications
- buying-service-al202339-live - REST based service for caravan buying
Impact
Services Affected
- QAB buy/purchase web services
- [List additional services and dependencies]
Technical Considerations
- Legacy code modernization requirements
- API compatibility with existing consumers
- Integration with payment systems
- Transaction handling in serverless environment
- Performance and response time requirements
- Error handling and retry logic
Data Considerations
- Purchase data storage and retrieval
- Transaction state management
- Database access patterns
- Data consistency requirements
- Audit logging
Implementation Plan
Phase 1: Assessment & Design
- Document current buy service functionality
- Identify all consumers and integration points
- Map payment and transaction flows
- Design serverless architecture for QabBuy
- Define migration strategy for legacy code
- Assess infrastructure and security requirements
- Create proof of concept
Phase 2: Development
- Set up QabBuy serverless infrastructure
- Migrate/refactor purchase logic
- Implement serverless endpoints
- Configure API Gateway and routing
- Implement authentication and authorization
- Set up transaction handling
- Implement monitoring, logging, and alerting
- Create comprehensive test suite including transaction scenarios
Phase 3: Migration
- Deploy to staging environment
- Integration testing with consumers
- Payment system integration testing
- Performance and load testing
- Transaction failure scenario testing
- User acceptance testing
- Security and compliance review
- Create rollback procedures
Phase 4: Cutover
- Gradual traffic migration to new stack
- Monitor service health and transaction success rates
- Update consumer configurations
- Validate payment processing
- Decommission legacy buy services
- Archive legacy code and documentation
Risks & Mitigation
| Risk | Impact | Mitigation |
|---|---|---|
| Transaction failures during migration | Critical | Robust rollback plan, gradual cutover with monitoring |
| Payment processing issues | Critical | Extensive testing with payment systems, parallel running |
| Service disruption | High | Blue-green deployment with quick rollback capability |
| Legacy code complexity | High | Thorough documentation and refactoring plan |
| Integration breakage | High | Extensive integration testing before cutover |
| Data inconsistency | High | Transaction integrity testing, audit logging |
| Performance degradation | Medium | Load testing and capacity planning |
| Compliance issues | High | Security review and compliance validation |
Timeline
[To be determined]
Status
Current Status: Draft
History:
- 2025-12-22: Proposal created