Woovi - Safe Coding Practices

Safe Coding Practices at Woovi

Transcript

1. Safe Coding Practices
2. Sibelius Seraphini @sseraphini in/sibeliusseraphin i sibelius
3. Overview - What is Safe Code? - Changing Production Code - Feature Flag - Online Migrations - Manual + Automated Tests - Performance - Monitoring - Going to Production
4. What is Safe Code ? - It won't break production - It won't mess with data - Proper error handling - Edge case handling - It works with existing production code - It is not a breaking change - It is backward compatible - It has performance in mind - Automated tests - Avoid regression - Without vulnerability - Security
5. Changing Production Code
6. What is hard about existing code in production? - You need to understand it - You don't know all the second order effects that your changes will cause it - You can't see underlying structure - You can make breaking changes
7. Feature Flag
8. Feature Flag
9. Feature Flag in Backend
10. Feature Flag in Frontend
11. Feature Flag - Enables you to test in production in a safe way - Enable you to test in production with one or more customers before releasing to everybody (rollout pattern) - Always test both branches of your feature flag.
12. Breaking Changes - It happens when you break the contract - It happens when you break the existing behavior
13. Breaking Changes
14. Online Migrations - Tick Tock
15. Online Migrations - Tick Tock
16. Manual + Automated Tests - Manual tests to learn about the product and business logic - You can only make automated tests after testing manually - Automated tests avoid regression and catch second order effects when changing codes in the future - Use test plan for pragmatic testing
17. How to find automated tests to run ? - Tests could not be colocated with the existing code in the monorepo - Moving more Woovi code to microservices would simplify this. - Mostly integration tests (endpoints, mutations, queries, jobs)
18. How to find automated tests to run ?
19. How to find automated tests to run ?
20. Validate Code Coverage
21. Performance
22. Performance
23. Performance - Check if your queries use Index - Optimize your aggregates - Reduce $lookup - Reduce number of requests to database - Add cache if needed
24. Monitoring
25. Going to Production - Test yourself in production - Use metabase to validate your data - Monitor using Kibana - Sentry - Notify CS/Sales if everything is correct
26. All my content
27. We are hiring!