Socket.IO for Haskell Folks --by banacorn --on Functional Thursday Meetup 8

1. Socket.IO
for Haskell Folks

5. Real-time Applications

6. Regular HTTP

7. Polling

8. Long-Polling

9. EventSource

10. WebSocket

11. WebSocket

12. “TCP for the web”

13. PROS
Bi-directional + Full-duplex
!
Lower overhead
!
Port 80

14. CONS
Not widely supported
!
Still a draft*

15. Socket.IO

16. asdf

17. “The cross-browser
cross-device WebSocket”

18. Browser
Support
IE 5.5+
Safari 2+
Google Chrome 4+
Firefox 3+
Opera 10.61+

19. Transport
Support
WebSocket
Flash Socket
AJAX long polling
AJAX multipart
Forever iframe
JSONP Polling

20. socket.emit(‘news’, ‘hey!’);
!
!
!
Server

21. socket.on(‘news’, function (data) {
console.log(data); // hey!
});
!
Client

22. socket.emit(‘news’, ‘hey!’);
!
socket.on(‘ping’, function () {
socket.emit(‘pong’);
});
Server

23. socket.on(‘news’, function (data) {
console.log(data); // hey!
});
!
socket.emit(‘ping’);
Client

24. Originated from Node.js

25. Now also available
in many other languages
Erlang
Java
Lua
Python
Perl
Go
C++
C
Objective-C
Haxe
Ruby
PHP

26. Except for Haskell

28. socketio-0.1.0

30. socket.emit(‘news’, ‘hey!’);
!
socket.on(‘ping’, function () {
socket.emit(‘pong’);
});

31. emit “news” [“hey!”]
!
on “ping” $ emit “pong” []

32. Transport
Support
WebSocket (80%)
Flash Socket
AJAX long polling
AJAX multipart
Forever iframe
JSONP Polling

33. Difficulties

34. Transport Support
ಠ~ಠ

35. Transport
Support
WebSocket
Flash Socket
AJAX long polling
AJAX multipart
Forever iframe
JSONP Polling

36. Transport
Support
WebSocket
Flash Socket
AJAX long polling
AJAX multipart
Forever iframe
JSONP Polling

37. “Premature optimization is
the root of all evil”

38. Monad Transformers
ಠ~ಠ

41. !
KEEP
CALM
AND
JUST
USE IT

43. Iteratee I/O
ಠ~ಠ

48. String/Text/ByteString
ಠ~ಠ

50. {-# LANGUAGE OverloadedStrings #-}

51. Open Source Community
ಠ~ಠ

54. Originated from Node.js

55. Cabal Hell
ಠ~ಠ

56. > cabal uninstall
cabal: unrecognised command: uninstall (try --help)

58. cabal-dev?

59. LIVE DEMO

61. http://banacorn.org:3000

63. TODO

64. cabal-dev?

65. banacorn/socket.io-haskell
!
!
!
ALL CONTRIBUTIONS ARE WELCOME!

66. THANKS!
Questions?