My challenge, new middleware everyday. Here is my lightning talk about writing weird Rack Middlewares

1. Stupid Rack
Middleware
Tricks
josh@aiderss.com
@joshbuddy
http://github.com/joshbuddy

2. What is Rack?

3. What is Rack?
Standard interface for HTTP servers and application.

4. What is Rack?
Standard interface for HTTP servers and application.
CGI, FastCGI,
Mongrel, Thin,
WEBrick
and many more!

5. What is Rack?
Standard interface for HTTP servers and application.
CGI, FastCGI, Rails, Merb,
Mongrel, Thin, Sinatra, Ramaze,
WEBrick a proc
and many more! your next great
framework

6. What is Rack
Middleware?

7. What is Rack
Middleware?
HTTP Server

8. What is Rack
Middleware?
HTTP Server Application

9. What is Rack
Middleware?
HTTP Server Application

10. What is Rack
Middleware?
Transparent
Intercepting
Caching
Content filtering

11. What is Rack
Middleware?
Transparent
Intercepting
Caching
Content filtering
(insert your thingy here)

12. My Challenge

13. My Challenge
I'm going to write a
new Rack
Middleware
everyday of
RailsConf.

14. My Challenge
I'm going to write a
new Rack
Middleware
everyday of
RailsConf.
(with tests)

15. #1 Rack::Rewrite
http://github.com/joshbuddy/rack-rewrite

16. #1 Rack::Rewrite
http://github.com/joshbuddy/rack-rewrite
Get a request, rewrite it!

17. #1 Rack::Rewrite
http://github.com/joshbuddy/rack-rewrite
Get a request, rewrite it!
I hates this

18. #1 Rack::Rewrite
http://github.com/joshbuddy/rack-rewrite
use Rack::Rewrite do
on :method => 'get' do
# If the request has a has a param of kitten=cute or
# kitten=happy, lets log it and pass it on!
#
on :params => {:kitten => /cute|happy/} do
act { log('what a nice cat') }
pass
end
fail
end
end

19. #2 Rack::Regenerate
http://github.com/joshbuddy/rack-regenerate

20. #2 Rack::Regenerate
http://github.com/joshbuddy/rack-regenerate
No idea.
But say you had a request. And it was something you
wanted to get hit every five minutes.

21. #2 Rack::Regenerate
http://github.com/joshbuddy/rack-regenerate
X-Cache-Regenerate: [interval in seconds] [number of times to call]

22. #2 Rack::Regenerate
http://github.com/joshbuddy/rack-regenerate
X-Cache-Regenerate: [interval in seconds] [number of times to call]
X-Cache-Regenerate: 2 5
Request

23. #2 Rack::Regenerate
http://github.com/joshbuddy/rack-regenerate
X-Cache-Regenerate: [interval in seconds] [number of times to call]
X-Cache-Regenerate: 2 5
Request Response

24. #2 Rack::Regenerate
http://github.com/joshbuddy/rack-regenerate
X-Cache-Regenerate: [interval in seconds] [number of times to call]
X-Cache-Regenerate: 2 5
Request Response
Intercept

25. #2 Rack::Regenerate
http://github.com/joshbuddy/rack-regenerate
X-Cache-Regenerate: [interval in seconds] [number of times to call]
X-Cache-Regenerate: 2 5
Request Response
Intercept
2 seconds

26. #2 Rack::Regenerate
http://github.com/joshbuddy/rack-regenerate
X-Cache-Regenerate: [interval in seconds] [number of times to call]
X-Cache-Regenerate: 2 5
Request Response
Intercept
2 seconds
2 seconds

27. #2 Rack::Regenerate
http://github.com/joshbuddy/rack-regenerate
X-Cache-Regenerate: [interval in seconds] [number of times to call]
X-Cache-Regenerate: 2 5
Request Response
Intercept
2 seconds
2 seconds
5.times!

28. #3 Rack::Capabilities
http://github.com/joshbuddy/rack-capabilities

29. #3 Rack::Capabilities
http://github.com/joshbuddy/rack-capabilities
Middleware

30. #3 Rack::Capabilities
http://github.com/joshbuddy/rack-capabilities
Middleware
Middleware

31. #3 Rack::Capabilities
http://github.com/joshbuddy/rack-capabilities
Middleware
Middleware
Middleware

32. #3 Rack::Capabilities
http://github.com/joshbuddy/rack-capabilities
Middleware
Middleware
Middleware
Middleware

33. #3 Rack::Capabilities
http://github.com/joshbuddy/rack-capabilities
Middleware
Who’s that
Middleware
middleware
Middleware
?
Middleware

34. #3 Rack::Capabilities
http://github.com/joshbuddy/rack-capabilities
# who is before me?
Rack::Capabilities.before(self)
# who is after me?
Rack::Capabilities.after(self)
# where can I go find AGoodTime?
Rack::Capabilities.find(AGoodTime)
# ==> nil

35. #4 Rack::CacheWhileRevalidate
http://github.com/joshbuddy/rack-cache-while-revalidate

36. #4 Rack::CacheWhileRevalidate
http://github.com/joshbuddy/rack-cache-while-revalidate
Request

37. #4 Rack::CacheWhileRevalidate
http://github.com/joshbuddy/rack-cache-while-revalidate
Request Cache

38. #4 Rack::CacheWhileRevalidate
http://github.com/joshbuddy/rack-cache-while-revalidate
STALE!
Request Cache

39. #4 Rack::CacheWhileRevalidate
http://github.com/joshbuddy/rack-cache-while-revalidate
Request Cache Application
Revalidate
Serve stale data

40. The End?