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
Defly
Search
Andrew Liu
August 27, 2011
Programming
0
340
Defly
A debug tool for Ruby
Andrew Liu
August 27, 2011
Tweet
Share
More Decks by Andrew Liu
See All by Andrew Liu
Facebook Graph API
eggegg
7
640
HTTP
eggegg
17
1.5k
Version Control System - Git
eggegg
4
670
Introduction to Ruby
eggegg
3
580
Other Decks in Programming
See All in Programming
MDN Web Docs に日本語翻訳でコントリビュートしたくなる
ohmori_yusuke
1
130
Team operations that are not burdened by SRE
kazatohiei
1
310
Node-RED を(HTTP で)つなげる MCP サーバーを作ってみた
highu
0
120
NPOでのDevinの活用
codeforeveryone
0
840
dbt民主化とLLMによる開発ブースト ~ AI Readyな分析サイクルを目指して ~
yoshyum
3
1k
AIともっと楽するE2Eテスト
myohei
7
2.7k
ISUCON研修おかわり会 講義スライド
arfes0e2b3c
1
450
プロダクト志向なエンジニアがもう一歩先の価値を目指すために意識したこと
nealle
0
130
設計やレビューに悩んでいるPHPerに贈る、クリーンなオブジェクト設計の指針たち
panda_program
6
2.2k
たった 1 枚の PHP ファイルで実装する MCP サーバ / MCP Server with Vanilla PHP
okashoi
1
260
Discover Metal 4
rei315
2
140
RailsGirls IZUMO スポンサーLT
16bitidol
0
190
Featured
See All Featured
Practical Orchestrator
shlominoach
189
11k
Statistics for Hackers
jakevdp
799
220k
Become a Pro
speakerdeck
PRO
29
5.4k
I Don’t Have Time: Getting Over the Fear to Launch Your Podcast
jcasabona
32
2.4k
Reflections from 52 weeks, 52 projects
jeffersonlam
351
20k
XXLCSS - How to scale CSS and keep your sanity
sugarenia
248
1.3M
Six Lessons from altMBA
skipperchong
28
3.9k
Designing Experiences People Love
moore
142
24k
Sharpening the Axe: The Primacy of Toolmaking
bcantrill
44
2.4k
Let's Do A Bunch of Simple Stuff to Make Websites Faster
chriscoyier
507
140k
Creating an realtime collaboration tool: Agile Flush - .NET Oxford
marcduiker
30
2.1k
Done Done
chrislema
184
16k
Transcript
Defly Debugging and Tracing Tool for Ruby http://github.com/eggegg/defly
Andrew Liu 劉彥廷 • College Student • Intern @ Cardinalblue
• eggegg @ github • Ruby, iOS, Android •
[email protected]
gem install defly
Defly is for... • Trace method calls • Trace instance
variables • Better error messages • Inspect the point of error
class Warrior attr_accessor :hp, :mp def sleep self.hp += 10
self.mp += 2 end end
class Warrior attr_accessor :hp, :mp def sleep puts "BEFORE: #{@hp},
#{@mp}" self.hp += 10 puts "AFTER ADDING HP: #{@hp}, #{@mp}" self.mp += 2 puts "AFTER ADDING MP: #{@hp}, #{@mp}" end end
class Warrior attr_accessor :hp, :mp def sleep self.hp += 10
self.mp += 2 end end require 'defly' Warrior.debug! Warrior.new.trace([:hp, :hp=, :mp, :mp=, :sleep], [:@hp, :@mp]) do |warrior| warrior.hp = 10 warrior.mp = 20 warrior.sleep end
Tracing hp, hp=, mp, mp=, sleep on Warrior instance Tracing
@hp, @mp on Warrior instance <<<<< Warrior#hp=(10) # (irb):14:in `block in irb_binding' @hp = 10 # undefined @mp = nil # undefined >>>>> 10 <<<<< Warrior#mp=(20) # (irb):15:in `block in irb_binding' @mp = 20 # undefined >>>>> 20 <<<<< Warrior#sleep() # (irb):16:in `block in irb_binding' <<<<< Warrior#hp() # (irb):7:in `sleep' >>>>> 10 <<<<< Warrior#hp=(20) # (irb):7:in `sleep' @hp = 20 # 10 -> 20 >>>>> 20 <<<<< Warrior#mp() # (irb):8:in `sleep' >>>>> 20 <<<<< Warrior#mp=(22) # (irb):8:in `sleep' @mp = 22 # 20 -> 22 >>>>> 22 >>>>> 22
NoMethodError debugging = nil debugging.is_annoying irb(main):001:0> require 'bug' NoMethodError: undefined
method `is_annoying' for nil:NilClass from /Users/eggegg/bug.rb:2:in `<top (required)>' ... bug.rb irb Where is the bug???
irb(main):003:0> require 'defly' => true irb(main):004:0> require 'bug' NoMethodError: undefined
method `is_annoying' for nil:NilClass bug.rb:2> debugging.<<is_annoying>> from /Users/andrewliu/bug.rb:2:in `<top (required)>'
Inspecting Errors class Rocket def launch! @reason = "Bugs invasion"
raise "Engine Fail" end end Rocket.debug! rocket = Rocket.new rocket.watch_error "Engine Fail" rocket.launch!
>>>>> Error received: "Engine Fail" >>>>> #<Rocket:0(0)>> @reason => "Bugs
invasion" #<Rocket:0(0)>> Ruby shell (Rib by godfat) to inspect errors!
Thanks! Any Question?