Added cache evict for delete Domains, incl. major improvements

[petruki]

This pull request significantly enhances the cache system to support automatic cache invalidation when domains are deleted and improves the cache-worker communication protocol. It also expands the test suite to verify cache updates for domain creation and deletion scenarios. The changes ensure the cache stays in sync with the database, not just for updates but also for removals, and refactor the worker logic for clarity and extensibility.

Cache invalidation and update improvements:

• Added support for cache deletions: when a domain is removed from the database, the cache is now notified and deletes the corresponding entry (src/helpers/cache/index.js, src/helpers/cache/worker-manager.js, src/helpers/cache/worker.js). [1] [2] [3] [4] [5]
• Implemented a protocol for the worker to request and receive the list of cached domain IDs, enabling detection of deletions (src/helpers/cache/worker-manager.js, src/helpers/cache/worker.js). [1] [2] [3] [4] [5]

Refactoring and code quality:

• Refactored worker logic: renamed checkForUpdates to refreshCache, split out logic for checking deletions and updates, and improved error handling and documentation (src/helpers/cache/worker.js). [1] [2] [3] [4]

Test suite enhancements:

• Added tests to verify that the cache is updated when a new domain is created and that cache entries are removed when a domain is deleted (tests/unit-test/cache.test.js).
• Improved the domain update waiting helper to be more robust and general (tests/unit-test/cache.test.js).

Minor improvements:

• Simplified code by removing unused lastUpdate fields from cache entries, focusing on version numbers for cache validation (src/helpers/cache/index.js, src/helpers/cache/worker.js). [1] [2] [3]
• Used optional chaining and improved null checks for worker shutdown (src/helpers/cache/index.js).

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
81.1% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud