HOW TO READ HUGE OPEN SOURCE CODE EASILY

for RailsConf 2019 LT

Transcript

1. HOW TO READ HUGE OPEN SOURCE CODE EASILY @yhirano55 at RailsConf 2019
2. self.inspect ➤Yoshiyuki Hirano from JAPAN ➤GitHub: @yhirano55 ➤Twitter: @yoshi_hirano ➤Rails Contributors #62 ➤I’m chief organizer of “Railsdm” ➤I love Rails community
3. Have you ever read Ruby on Rails source code?
4. MORE QUESTIONS ➤Do you know the request/response Lifecycle of Rails application? ➤Do you know the steps of Active Record's create, update, validate, and destroy? ➤Do you know the processing of initialization of Rails application?
5. I do not think many of them actually do
6. To tell the truth,
7. I have not, too
8. I guess we don't have much time and patience
9. Yesterday, I was impressed by Skylight’s sponsor talk. The design of the rack application is really elegant
10. AND.. ➤I want to read the code of its lifecycle of Rails application ➤But I don't want to spend much time to trace the code ➤I want to read source code easily. What would you do?
11. Finally, I've shipped a new RubyGem this morning
12. yhirano55/trace_location
13. DEMO
14. At first, boot rails console, and set request env
15. And execute `Rails.application.call(env)` inside `TraceLocation.trace` block
16. Then it generates a log file
17. It’s traced locations about `Rails.application.call(env)`
18. It’s traced locations about `Rails.application.call(env)` CALL on rails/engine.rb:522 #call
19. It’s traced locations about `Rails.application.call(env)` CALL on rails/application.rb:607 #build_request
20. It helps you can get tracing the processing of the Lifecycle of Rails application easily!!
21. HOW IT WORK? ➤Use TracePoint that is a Ruby standard API ➤TracePoint API is one of the BLACK MAGIC in Ruby
22. IMPLEMENTATION This is TracePoint
23. IMPLEMENTATION Collect logs
24. IMPLEMENTATION Trace events while block call And disable when it finished
25. In making this gem, I used TracePoint for the first time. It makes me really feel so good!!
26. It helps you get deeply understanding Ruby on Rails
27. It's my pleasure to help you enjoy Ruby on Rails
28. self.inspect ➤Yoshiyuki Hirano from JAPAN ➤GitHub: @yhirano55 ➤Twitter: @yoshi_hirano ➤Rails Contributors #62 ➤I’m chief organizer of “Railsdm” ➤I love Rails community
29. We’re going to have a new Ruby on Rails conference The name is…
30. RailsKaigi 2020
31. We hope you join RailsKaigi 2020 in Japan
32. yhirano55/trace_location Thank you so much