HOW TO READ HUGE OPEN SOURCE CODE EASILY

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