Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
HOW TO READ HUGE OPEN SOURCE CODE EASILY
Search
yhirano55
May 01, 2019
Technology
3
810
HOW TO READ HUGE OPEN SOURCE CODE EASILY
for RailsConf 2019 LT
yhirano55
May 01, 2019
Tweet
Share
More Decks by yhirano55
See All by yhirano55
カンファレンス型 技術イベントの作り方 〜Rails Developers Meetup の辿った道〜 / How to Organize a Tech Conference
yhirano55
27
6.2k
Other Decks in Technology
See All in Technology
AI エンジニアの立場からみた、AI コーディング時代の開発の品質向上の取り組みと妄想
soh9834
8
630
MCPと認可まわりの話 / mcp_and_authorization
convto
2
350
【2025 Japan AWS Jr. Champions Ignition】点から線、線から面へ〜僕たちが起こすコラボレーション・ムーブメント〜
amixedcolor
1
110
恐怖!テストコードなき夜
tsukuboshi
2
110
ファインディにおける Dataform ブランチ戦略
hiracky16
0
240
【CEDEC2025】現場を理解して実現!ゲーム開発を効率化するWebサービスの開発と、利用促進のための継続的な改善
cygames
PRO
0
550
[TechNight #91] Oracle Database 最新パフォーマンス分析手法
oracle4engineer
PRO
4
300
Perlアプリケーションで トレースを実装するまでの 工夫と苦労話
masayoshi
0
280
Kiroでインフラ要件定義~テスト を実施してみた
nagisa53
1
130
大規模イベントを支える ABEMA の アーキテクチャ 変遷 2025
nagapad
5
580
alecthomas/kong はいいぞ
fujiwara3
6
1.3k
【Λ(らむだ)】最近のアプデ情報 / RPALT20250729
lambda
0
190
Featured
See All Featured
Six Lessons from altMBA
skipperchong
28
3.9k
Imperfection Machines: The Place of Print at Facebook
scottboms
267
13k
The Illustrated Children's Guide to Kubernetes
chrisshort
48
50k
Building Adaptive Systems
keathley
43
2.7k
How to Ace a Technical Interview
jacobian
278
23k
Put a Button on it: Removing Barriers to Going Fast.
kastner
60
3.9k
Statistics for Hackers
jakevdp
799
220k
Become a Pro
speakerdeck
PRO
29
5.5k
実際に使うSQLの書き方 徹底解説 / pgcon21j-tutorial
soudai
PRO
182
54k
The Art of Programming - Codeland 2020
erikaheidi
54
13k
KATA
mclloyd
31
14k
How to train your dragon (web standard)
notwaldorf
96
6.1k
Transcript
HOW TO READ HUGE OPEN SOURCE CODE EASILY @yhirano55 at
RailsConf 2019
self.inspect ➤Yoshiyuki Hirano from JAPAN ➤GitHub: @yhirano55 ➤Twitter: @yoshi_hirano ➤Rails
Contributors #62 ➤I’m chief organizer of “Railsdm” ➤I love Rails community
Have you ever read Ruby on Rails source code?
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?
I do not think many of them actually do
To tell the truth,
I have not, too
I guess we don't have much time and patience
Yesterday, I was impressed by Skylight’s sponsor talk. The design
of the rack application is really elegant
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?
Finally, I've shipped a new RubyGem this morning
yhirano55/trace_location
DEMO
At first, boot rails console, and set request env
And execute `Rails.application.call(env)` inside `TraceLocation.trace` block
Then it generates a log file
It’s traced locations about `Rails.application.call(env)`
It’s traced locations about `Rails.application.call(env)` CALL on rails/engine.rb:522 #call
It’s traced locations about `Rails.application.call(env)` CALL on rails/application.rb:607 #build_request
It helps you can get tracing the processing of the
Lifecycle of Rails application easily!!
HOW IT WORK? ➤Use TracePoint that is a Ruby standard
API ➤TracePoint API is one of the BLACK MAGIC in Ruby
IMPLEMENTATION This is TracePoint
IMPLEMENTATION Collect logs
IMPLEMENTATION Trace events while block call And disable when it
finished
In making this gem, I used TracePoint for the first
time. It makes me really feel so good!!
It helps you get deeply understanding Ruby on Rails
It's my pleasure to help you enjoy Ruby on Rails
self.inspect ➤Yoshiyuki Hirano from JAPAN ➤GitHub: @yhirano55 ➤Twitter: @yoshi_hirano ➤Rails
Contributors #62 ➤I’m chief organizer of “Railsdm” ➤I love Rails community
We’re going to have a new Ruby on Rails conference
The name is…
RailsKaigi 2020
We hope you join RailsKaigi 2020 in Japan
yhirano55/trace_location Thank you so much