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
Domains in node 0.8
Search
Felix Geisendörfer
June 29, 2012
Technology
8
5.5k
Domains in node 0.8
A quick presentation I gave at HolidayExtras on using the new domain feature in node.js 0.8.
Felix Geisendörfer
June 29, 2012
Tweet
Share
More Decks by Felix Geisendörfer
See All by Felix Geisendörfer
tus.io - Resumable File Uploads (Lightning Talk)
felixge
2
780
Programming flying robots with JavaScript
felixge
2
960
Programming flying robots with JavaScript
felixge
0
600
Programming an AR Drone Firmware with JS (de)
felixge
1
620
Faster than C?
felixge
1
1.2k
Flying robots over a 10.000 mile distance with JavaScript.
felixge
0
490
Faster than C?
felixge
1
650
The power of node.js (with quadcopters)
felixge
0
500
Faster than C?
felixge
0
420
Other Decks in Technology
See All in Technology
AIエージェントの開発に必須な「コンテキスト・エンジニアリング」とは何か──プロンプト・エンジニアリングとの違いを手がかりに考える
masayamoriofficial
0
330
Goss: Faiss向けの新しい本番環境対応 Goバインディング #coefl_go_jp
bengo4com
0
1.1k
人を動かすことについて考える
ichimichi
2
310
GitHub Copilot coding agent を推したい / AIDD Nagoya #1
tnir
2
4.4k
ECS モニタリング手法大整理
yendoooo
1
120
DeNA での思い出 / Memories at DeNA
orgachem
PRO
2
690
知られざるprops命名の慣習 アクション編
uhyo
10
2.1k
そのコンポーネント、サーバー?クライアント?App Router開発のモヤモヤを可視化する補助輪
makotot
3
260
Understanding Go GC #coefl_go_jp
bengo4com
0
1.1k
自治体職員がガバクラの AWS 閉域ネットワークを理解するのにやって良かった個人検証環境
takeda_h
2
380
マイクロモビリティシェアサービスを支える プラットフォームアーキテクチャ
grimoh
1
190
AWSの最新サービスでAIエージェント構築に楽しく入門しよう
minorun365
PRO
10
610
Featured
See All Featured
Done Done
chrislema
185
16k
Facilitating Awesome Meetings
lara
55
6.5k
The Invisible Side of Design
smashingmag
301
51k
Building a Modern Day E-commerce SEO Strategy
aleyda
43
7.5k
I Don’t Have Time: Getting Over the Fear to Launch Your Podcast
jcasabona
33
2.4k
Balancing Empowerment & Direction
lara
2
580
実際に使うSQLの書き方 徹底解説 / pgcon21j-tutorial
soudai
PRO
183
54k
Performance Is Good for Brains [We Love Speed 2024]
tammyeverts
10
1k
Designing for Performance
lara
610
69k
Building Applications with DynamoDB
mza
96
6.6k
ReactJS: Keep Simple. Everything can be a component!
pedronauck
667
120k
Creating an realtime collaboration tool: Agile Flush - .NET Oxford
marcduiker
31
2.2k
Transcript
Domains in node 0.8 A quick introduction Freitag, 29. Juni
12
1 var app = require('express')(); 2 3 app.get('/search', function(req, res,
next) { 4 doSearch(req.params, function(err, result) { 5 if (err) return next(err); 6 7 // trying to access non-existing property 8 if (result.foo.bar) { 9 console.log('does not work'); 10 } 11 }); 12 }); 13 14 app.listen(8080); Freitag, 29. Juni 12
/Users/Felix/Desktop/domains/example.js:14 if (result.foo.bar) { ^ TypeError: Cannot read property 'bar'
of undefined at /Users/Felix/Desktop/domains/example.js:14:19 at doSearch (/Users/Felix/Desktop/domains/example.js:3:5) at process.startup.processNextTick.process._tickCallback (node.js:244:9) Freitag, 29. Juni 12
1 process.on('uncaughtException', function(err) { 2 // Keeps the process from
crashing 3 // But does not let you find out which `req` 4 // was causing the `err` 5 }); Freitag, 29. Juni 12
Domains to the rescue! Freitag, 29. Juni 12
1 var createDomain = require('domain').create; 2 3 app.use(function(req, res, next)
{ 4 var domain = createDomain(); 5 6 domain.on('error', function(err) { 7 // alternative: next(err) 8 res.statusCode = 500; 9 res.end(err.message + '\n'); 10 11 domain.dispose(); 12 }); 13 14 domain.enter(); 15 next(); 16 }); Freitag, 29. Juni 12
$ curl -i localhost:8080/search HTTP/1.1 500 Internal Server Error X-Powered-By:
Express Date: Fri, 29 Jun 2012 10:50:18 GMT Connection: keep-alive Transfer-Encoding: chunked Cannot read property 'bar' of undefined Freitag, 29. Juni 12
Questions? Freitag, 29. Juni 12
Hiring node.js developers @ marcgreenstock @dan_jenkins Freitag, 29. Juni 12