Something something rack
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Rack is a Ruby web server interface specification that provides a minimal abstraction between web servers and web applications. It standardizes how web requests and responses are handled, allowing applications to ignore differences between web servers and focus on the application code. Rack allows web applications to be run on many different web servers without changing code. Developers can also add middleware between the web server and application code to modify requests and responses.
![HOW DO YOU USE IT?
How to call it?
lambda { |env|
[
200,
{
‘Content-Type’ => ‘text/plain’,
‘Content-Lenght’ => ‘5’,
},
[‘Hello’]
]
}](https://image.slidesharecdn.com/somethingsomethingrack-100501113316-phpapp01/85/Something-something-rack-9-320.jpg)
![HOW DO YOU USE IT?
How to call it?
lambda { |env|
[
200,
{
‘Content-Type’ => ‘text/plain’,
‘Content-Lenght’ => ‘5’,
},
[‘Hello’]
]
}](https://image.slidesharecdn.com/somethingsomethingrack-100501113316-phpapp01/85/Something-something-rack-11-320.jpg)
![HOW DO YOU USE IT?
How to call it?
lambda { |env|
[
200,
{
‘Content-Type’ => ‘text/plain’,
‘Content-Lenght’ => ‘5’,
},
[‘Hello’]
]
}](https://image.slidesharecdn.com/somethingsomethingrack-100501113316-phpapp01/85/Something-something-rack-12-320.jpg)
![HOW DO YOU USE IT?
How to call it?
lambda { |env|
[
200,
{
‘Content-Type’ => ‘text/plain’,
‘Content-Lenght’ => ‘5’,
},
[‘Hello’]
]
}](https://image.slidesharecdn.com/somethingsomethingrack-100501113316-phpapp01/85/Something-something-rack-13-320.jpg)
![HOW DO YOU USE IT?
How to call it?
lambda { |env|
[
200,
{
‘Content-Type’ => ‘text/plain’,
‘Content-Lenght’ => ‘5’,
},
[‘Hello’]
]
}](https://image.slidesharecdn.com/somethingsomethingrack-100501113316-phpapp01/85/Something-something-rack-14-320.jpg)
![HOW DO YOU USE IT?
How to call it?
lambda { |env|
[
200,
{
‘Content-Type’ => ‘text/plain’,
‘Content-Lenght’ => ‘5’,
},
[‘Hello’]
]
}](https://image.slidesharecdn.com/somethingsomethingrack-100501113316-phpapp01/85/Something-something-rack-15-320.jpg)
![HOW DO YOU USE IT?
How to call it?
lambda { |env|
[
200,
{
‘Content-Type’ => ‘text/plain’,
‘Content-Lenght’ => ‘5’,
},
[‘Hello’]
]
}](https://image.slidesharecdn.com/somethingsomethingrack-100501113316-phpapp01/85/Something-something-rack-16-320.jpg)
![HOW DO YOU USE IT?
How to call it?
run lambda { |env|
[
200,
{
‘Content-Type’ => ‘text/plain’,
‘Content-Lenght’ => ‘5’,
},
[‘Hello’]
]
}](https://image.slidesharecdn.com/somethingsomethingrack-100501113316-phpapp01/85/Something-something-rack-17-320.jpg)
![HOW DO YOU USE IT?
class HelloWorld
def call(env)
[200, {"Content-Type" => "text/plain"}, ["Hello World!"]]
end
end](https://image.slidesharecdn.com/somethingsomethingrack-100501113316-phpapp01/85/Something-something-rack-22-320.jpg)
![env[‘REQUEST_METHOD’]](https://image.slidesharecdn.com/somethingsomethingrack-100501113316-phpapp01/85/Something-something-rack-25-320.jpg)
Something something rack
- 2. OH, HI! • Joren • Openminds • @joren • tech.jorendegroof.be
- 3. OVERVIEW • Rack what? • Why Rack? • How do you use it? • Middleware
- 4. RACK WHAT?
- 5. RACK WHAT? Rack is a specification (and implementation) of a minimal abstract Ruby API that models HTTP
- 6. WHY RACK? • Stop writing handlers for every webserver • Keep the request and response simple
- 7. WHY RACK? Supported web servers
- 8. WHY RACK? Supported web frameworks
- 9. HOW DO YOU USE IT? How to call it? lambda { |env| [ 200, { ‘Content-Type’ => ‘text/plain’, ‘Content-Lenght’ => ‘5’, }, [‘Hello’] ] }
- 10. HOW DO YOU USE IT?
- 11. HOW DO YOU USE IT? How to call it? lambda { |env| [ 200, { ‘Content-Type’ => ‘text/plain’, ‘Content-Lenght’ => ‘5’, }, [‘Hello’] ] }
- 12. HOW DO YOU USE IT? How to call it? lambda { |env| [ 200, { ‘Content-Type’ => ‘text/plain’, ‘Content-Lenght’ => ‘5’, }, [‘Hello’] ] }
- 13. HOW DO YOU USE IT? How to call it? lambda { |env| [ 200, { ‘Content-Type’ => ‘text/plain’, ‘Content-Lenght’ => ‘5’, }, [‘Hello’] ] }
- 14. HOW DO YOU USE IT? How to call it? lambda { |env| [ 200, { ‘Content-Type’ => ‘text/plain’, ‘Content-Lenght’ => ‘5’, }, [‘Hello’] ] }
- 15. HOW DO YOU USE IT? How to call it? lambda { |env| [ 200, { ‘Content-Type’ => ‘text/plain’, ‘Content-Lenght’ => ‘5’, }, [‘Hello’] ] }
- 16. HOW DO YOU USE IT? How to call it? lambda { |env| [ 200, { ‘Content-Type’ => ‘text/plain’, ‘Content-Lenght’ => ‘5’, }, [‘Hello’] ] }
- 17. HOW DO YOU USE IT? How to call it? run lambda { |env| [ 200, { ‘Content-Type’ => ‘text/plain’, ‘Content-Lenght’ => ‘5’, }, [‘Hello’] ] }
- 18. config.ru
- 21. Hello
- 22. HOW DO YOU USE IT? class HelloWorld def call(env) [200, {"Content-Type" => "text/plain"}, ["Hello World!"]] end end
- 23. env
- 24. REQUEST_METHOD
- 27. PATH_INFO
- 28. /items/123
- 29. HTTP_*
- 30. HTTP_ACCEPT
- 31. rack.*
- 32. yournamespace.*
- 34. request.post?
- 35. HOW DO YOU USE IT? Example
- 36. MIDDLEWARE Middleware App HTTP
- 37. use Middleware A use Middleware B use Middleware C run app
- 38. class GoSlower def initialize(app) @app = app end def call(env) sleep(1) @app.call(env) end end
- 39. class GoSlower def initialize(app) @app = app end def call(env) sleep(1) @app.call(env) end end
- 40. class GoSlower def initialize(app) @app = app end def call(env) sleep(1) @app.call(env) end end
- 41. class GoSlower def initialize(app) @app = app end def call(env) sleep(1) @app.call(env) end end
- 42. 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'
- 43. EXAMPLES
- 46. WARDEN + DEVISE http://github.com/hassox/warden http://github.com/plataformatec/devise
- 53. QUESTIONS?
Editor's Notes
- #6: wrapping HTTP requests and responses in the simplest way possible
- #8: rack includes several handlers for the first web servers, the other distributions have included rack handlers on their own
- #9: 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
- #10: accepts basic ruby object like a lambda
- #11: accepts basic ruby object like a lambda
- #12: basic ruby object respond to call like a lambda
- #13: take 1 argument the environment
- #14: accepts basic ruby object like a lambda
- #15: accepts basic ruby object like a lambda
- #16: hash key value pairs for header
- #17: body must respond to each now just a string in an Array
- #23: don’t need to use lambda’s
- #30: http style header params
- #31: like http accept
- #32: rack namespaced protected keys in the environment
- #33: your own environment namespace
- #34: wrap it in a request object
- #36: normal builder toto
- #37: everytinh in front of our app
- #42: call down the next thing down stream this is the power of the middleware returning the result