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
820
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
6.3k
Other Decks in Technology
See All in Technology
Azure SynapseからAzure Databricksへ 移行してわかった新時代のコスト問題!?
databricksjapan
0
140
生成AIを活用したZennの取り組み事例
ryosukeigarashi
0
200
pprof vs runtime/trace (FlightRecorder)
task4233
0
160
about #74462 go/token#FileSet
tomtwinkle
1
290
ZOZOのAI活用実践〜社内基盤からサービス応用まで〜
zozotech
PRO
0
170
Escaping_the_Kraken_-_October_2025.pdf
mdalmijn
0
130
LLMアプリケーション開発におけるセキュリティリスクと対策 / LLM Application Security
flatt_security
7
1.8k
20201008_ファインディ_品質意識を育てる役目は人かAIか___2_.pdf
findy_eventslides
0
120
GA technologiesでのAI-Readyの取り組み@DataOps Night
yuto16
0
270
Exadata Database Service on Dedicated Infrastructure(ExaDB-D) UI スクリーン・キャプチャ集
oracle4engineer
PRO
2
5.4k
コンテキストエンジニアリングとは? 考え方と応用方法
findy_eventslides
4
890
Goにおける 生成AIによるコード生成の ベンチマーク評価入門
daisuketakeda
2
100
Featured
See All Featured
Imperfection Machines: The Place of Print at Facebook
scottboms
269
13k
Optimising Largest Contentful Paint
csswizardry
37
3.4k
How to Create Impact in a Changing Tech Landscape [PerfNow 2023]
tammyeverts
54
3k
Measuring & Analyzing Core Web Vitals
bluesmoon
9
610
[RailsConf 2023 Opening Keynote] The Magic of Rails
eileencodes
31
9.7k
StorybookのUI Testing Handbookを読んだ
zakiyama
31
6.2k
CoffeeScript is Beautiful & I Never Want to Write Plain JavaScript Again
sstephenson
162
15k
The MySQL Ecosystem @ GitHub 2015
samlambert
251
13k
What’s in a name? Adding method to the madness
productmarketing
PRO
23
3.7k
GraphQLの誤解/rethinking-graphql
sonatard
73
11k
The Web Performance Landscape in 2024 [PerfNow 2024]
tammyeverts
9
850
jQuery: Nuts, Bolts and Bling
dougneiner
64
7.9k
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