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
How Do I Contact Jetblue Airlines® Reservation Number: Fast Support Guide
thejetblueairhelpsupport
0
270
地図と生成AI
nakasho
0
560
Digitization部 紹介資料
sansan33
PRO
1
4.6k
AIでテストプロセス自動化に挑戦する
sakatakazunori
1
650
AI Ready API ─ AI時代に求められるAPI設計とは?/ AI-Ready API - Designing MCP and APIs in the AI Era
yokawasa
20
5.6k
DATA+AI SummitとSnowflake Summit: ユーザから見た共通点と相違点 / DATA+AI Summit and Snowflake Summit
nttcom
0
150
研究開発部メンバーの働き⽅ / Sansan R&D Profile
sansan33
PRO
3
18k
An introduction to Claude Code SDK
choplin
3
3.2k
QAを早期に巻き込む”って どうやるの? モヤモヤから抜け出す実践知
moritamasami
2
170
エンジニアリングマネージャー“お悩み相談”パネルセッション
ar_tama
1
560
MCP とマネージド PaaS で実現する大規模 AI アプリケーションの高速開発
nahokoxxx
1
1.3k
How do i Get in Touch With QuickBooks Payroll Support®️ USA Contact Numbers: Complete 2025 Support Guide
connectquickbooks
0
110
Featured
See All Featured
Designing Experiences People Love
moore
142
24k
A Modern Web Designer's Workflow
chriscoyier
695
190k
The Cult of Friendly URLs
andyhume
79
6.5k
Producing Creativity
orderedlist
PRO
346
40k
No one is an island. Learnings from fostering a developers community.
thoeni
21
3.4k
The Power of CSS Pseudo Elements
geoffreycrofte
77
5.9k
Visualization
eitanlees
146
16k
Building an army of robots
kneath
306
45k
Designing for Performance
lara
610
69k
Imperfection Machines: The Place of Print at Facebook
scottboms
267
13k
Rebuilding a faster, lazier Slack
samanthasiow
83
9.1k
Visualizing Your Data: Incorporating Mongo into Loggly Infrastructure
mongodb
47
9.6k
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