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Something something rack

by joren de groof on May 01, 2010

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My introduction talk to Rack at ArrrrCamp (http://arrrrcamp.be)

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My introduction talk to Rack at ArrrrCamp (http://arrrrcamp.be)

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wrapping HTTP requests and responses in the simplest way possible
rack includes several handlers for the first web servers, the other distributions have included rack handlers on their own
this means, you can run any of these frameworks on any of the previous web servers! without any changes

Camping support is included in rack
accepts basic ruby object
like a lambda
accepts basic ruby object
like a lambda
basic ruby object respond to call
like a lambda
take 1 argument
the environment
accepts basic ruby object
like a lambda
accepts basic ruby object
like a lambda
hash
key value pairs for header
body
must respond to each
now just a string in an Array
don’t need to use lambda’s
http style header params
like http accept
rack namespaced protected keys in the environment
your own environment namespace
wrap it in a request object
normal
builder
toto
everytinh in front of our app
call down the next thing down stream
this is the power of the middleware
returning the result

3 Favorites

Kevin Stewart , Software Developer/Manager at Adobe 1 year ago
Xiaohong Zhao Tags rack 2 years ago
why 404 , Web & Mobile Applications Developer at Private Tags rack 2 years ago

Something something rack — Presentation Transcript

SOMETHING SOMETHING RACK
OH, HI! • Joren • Openminds • @joren • tech.jorendegroof.be
OVERVIEW • Rack what? • Why Rack? • How do you use it? • Middleware
RACK WHAT?
RACK WHAT? Rack is a speciﬁcation (and implementation) of a minimal abstract Ruby API that models HTTP
WHY RACK? • Stop writing handlers for every webserver • Keep the request and response simple
WHY RACK? Supported web servers
WHY RACK? Supported web frameworks
HOW DO YOU USE IT? How to call it? lambda { |env| [ 200, { ‘Content-Type’ => ‘text/plain’, ‘Content-Lenght’ => ‘5’, }, [‘Hello’] ] }
HOW DO YOU USE IT?
HOW DO YOU USE IT? How to call it? lambda { |env| [ 200, { ‘Content-Type’ => ‘text/plain’, ‘Content-Lenght’ => ‘5’, }, [‘Hello’] ] }
HOW DO YOU USE IT? How to call it? lambda { |env| [ 200, { ‘Content-Type’ => ‘text/plain’, ‘Content-Lenght’ => ‘5’, }, [‘Hello’] ] }
HOW DO YOU USE IT? How to call it? lambda { |env| [ 200, { ‘Content-Type’ => ‘text/plain’, ‘Content-Lenght’ => ‘5’, }, [‘Hello’] ] }
HOW DO YOU USE IT? How to call it? lambda { |env| [ 200, { ‘Content-Type’ => ‘text/plain’, ‘Content-Lenght’ => ‘5’, }, [‘Hello’] ] }
HOW DO YOU USE IT? How to call it? lambda { |env| [ 200, { ‘Content-Type’ => ‘text/plain’, ‘Content-Lenght’ => ‘5’, }, [‘Hello’] ] }
HOW DO YOU USE IT? How to call it? lambda { |env| [ 200, { ‘Content-Type’ => ‘text/plain’, ‘Content-Lenght’ => ‘5’, }, [‘Hello’] ] }
HOW DO YOU USE IT? How to call it? run lambda { |env| [ 200, { ‘Content-Type’ => ‘text/plain’, ‘Content-Lenght’ => ‘5’, }, [‘Hello’] ] }
conﬁg.ru
$ rackup conﬁg.ru
$ curl http://localhost:9292
Hello
HOW DO YOU USE IT? class HelloWorld def call(env) [200, {"Content-Type" => "text/plain"}, ["Hello World!"]] end end
env
REQUEST_METHOD
env[‘REQUEST_METHOD’]
GET PUT POST DELETE HEAD OPTIONS TRACE
PATH_INFO
/items/123
HTTP_*
HTTP_ACCEPT
rack.*
yournamespace.*
request = Rack::Request.new(env)
request.post?
HOW DO YOU USE IT? Example
MIDDLEWARE Middleware App HTTP
use Middleware A use Middleware B use Middleware C run app
class GoSlower def initialize(app) @app = app end def call(env) sleep(1) @app.call(env) end end
class GoSlower def initialize(app) @app = app end def call(env) sleep(1) @app.call(env) end end
class GoSlower def initialize(app) @app = app end def call(env) sleep(1) @app.call(env) end end
class GoSlower def initialize(app) @app = app end def call(env) sleep(1) @app.call(env) end end
IN YOUR RAILS APP #environment.rb config.middleware.use “Rack::GoSlower” config.middleware.use “Rack::Cache”, :verbose => true, :metastrore => ‘file:/path/to/dir’, :entitystore => 'memcached://localhost:11211/body'
EXAMPLES
RACK::HONEYPOT http://github.com/sunlightlabs/rack-honeypot
RACK::CACHE http://github.com/rtomayko/rack-cache
WARDEN + DEVISE http://github.com/hassox/warden http://github.com/plataformatec/devise
RACK::DEBUG http://github.com/ddollar/rack-debug
RACK::GEOIP http://github.com/b/rack-geoip
RACK::GOOGLE-ANALYTICS http://github.com/leehambley/rack-google-analytics
RACK::REWRITE http://github.com/jtrupiano/rack-rewrite
RACK::MOBILE-DETECT http://github.com/talison/rack-mobile-detect
RACK::CONTRIB http://github.com/rack/rack-contrib
QUESTIONS?

Something something rack

by joren de groof on May 01, 2010

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Something something rack — Presentation Transcript