Upgrading the Networking Stack of LINE iOS

Chao Gu
LINE App Dev Team2 Senior Software Engineer
https://linedevday.linecorp.com/2020/ja/sessions/9858
https://linedevday.linecorp.com/2020/en/sessions/9858

Transcript

2. Background › Refactoring in a large project › LINT (LINE Improvement for Next Ten years) from last year https://linedevday.linecorp.com/jp/2019/sessions/A1-2 › Push optimization not covered
3. Agenda › Reason for Upgrading › Upgrade Process › Lessons Learned
4. As Is Deprecated / Customized SPDY Objective- C / C Widely Adopted
5. To Be HTTP3 HTTP2 Swift Smooth Transition
6. Process Create an Abstraction Layer Legacy Networking Features
7. Process Create an Abstraction Layer Legacy Networking Features
8. Process Create an Abstraction Layer Legacy Networking Features Abstraction Layer
9. Process Create an Abstraction Layer Legacy Networking Features Abstraction Layer
10. Abstraction Layer Collecting Request Information Request › Host › Path › Method › Headers › Data Serialization
11. Abstraction Layer Plugin Request Will Send Request Response Networking Abstraction Layer Abstraction Layer Networking Layer Did Receive Response
12. Abstraction Layer Plugin Request Turn On Network Activity Indicator Response Networking Abstraction Layer Abstraction Layer Networking Layer Turn Off Network Activity Indicator
13. Abstraction Layer Plugin Request Log Request Response Networking Abstraction Layer Abstraction Layer Networking Layer Log Response
14. Abstraction Layer Plugin Request Response Networking Abstraction Layer Abstraction Layer Networking Layer Check for a special header Modify headers
15. Abstraction Layer Plugin › Business logic separated from actual networking implementation › Business logic packed in a modularized way (in a single plugin)
16. Feature Feature Abstraction Layer Migration Abstraction Layer Legacy Networking Feature Feature Feature Feature
17. Abstraction Layer Migration › 70+ Tasks › 500+ Calls › Progressively
18. HTTP2 Implementation Legacy Networking Features Abstraction Layer Switcher HTTP2 Networking
19. HTTP2 Implementation SwiftNIOHTTP2 Simple wrapper over URLSession
20. Switching to HTTP2 HTTP2 Networking Features Abstraction Layer Switcher Legacy Networking
21. Switching to HTTP2 HTTP2 Networking Features Abstraction Layer Switcher Legacy Networking
22. Switching to HTTP2 HTTP2 Networking Features Abstraction Layer Switcher Legacy Networking Server-Controlled Flag
23. Switching to HTTP2 HTTP2 Networking Features Abstraction Layer Switcher Legacy Networking Server-Controlled Flag
24. Switching to HTTP2 HTTP2 Networking Features Abstraction Layer Switcher Legacy Networking Server-Controlled Flag
25. Switching to HTTP2 Phases Progressive roll out QA Real Dev
26. Lessons Learned › Have a clear separation of different abstraction levels › Use an abstraction layer to isolate the legacy code and upgrade to new code
27. References › https://davedelong.com/blog/2020/06/27/http-in-swift-part-1/ › https://github.com/Moya/Moya › https://github.com/apple?q=swift-nio
28. Thank you