koa introduction (Node.js Web Framework)

koa is a Node.js Web Framework. I've demonstrated some examples and also introduced some basic concepts in this internal sharing.

Transcript

1. Andre Lee next generation web framework for node.js koa
2. agenda • What is koa • Before Diving in koa • Hello koa • Running koa in Production?
3. agenda • What is koa • Before Diving in koa • Hello koa • Running koa in Production?
4. Node.js Web Frameworks
5. Node.js Web Frameworks • Express • Minimal, Muture, Ecosystem
6. Node.js Web Frameworks • Express • Minimal, Muture, Ecosystem
7. Node.js Web Frameworks • Express • Minimal, Muture, Ecosystem • hapi • Rich Framework
8. Node.js Web Frameworks • Express • Minimal, Muture, Ecosystem • hapi • Rich Framework
9. Node.js Web Frameworks • Express • Minimal, Muture, Ecosystem • hapi • Rich Framework • LoopBack • For creating APIs
10. Node.js Web Frameworks • Express • Minimal, Muture, Ecosystem • hapi • Rich Framework • LoopBack • For creating APIs
11. Node.js Web Frameworks • Express • Minimal, Muture, Ecosystem • hapi • Rich Framework • LoopBack • For creating APIs
12. Node.js Web Frameworks • Express • Minimal, Muture, Ecosystem • hapi • Rich Framework • LoopBack • For creating APIs
13. • Generator based control flow goodness co
14. • Generator based control flow goodness co
15. • Generator based control flow goodness co
16. • Generator based control flow goodness co
17. • Generator based control flow goodness co Node.js: co: yield Yieldable
18. • Generator based control flow goodness co Python: Tornado: yield Future Node.js: co: yield Yieldable
19. What is koa
20. What is koa • Node.js Web Framework
21. What is koa • Node.js Web Framework • Developed by Part of Express Team
22. What is koa • Node.js Web Framework • Developed by Part of Express Team • Generators via co
23. What is koa • Node.js Web Framework • Developed by Part of Express Team • Generators via co
24. What is koa • Node.js Web Framework • Developed by Part of Express Team • Generators via co
25. What is koa • Node.js Web Framework • Developed by Part of Express Team • Generators via co • Minimal Core
26. agenda • What is koa • Before Diving in koa • Hello koa • Running koa in Production?
27. Before Diving in koa
28. Before Diving in koa • Callback Hell
29. Callback Hell from http://callbackhell.com/
30. Before Diving in koa • Callback Hell
31. Before Diving in koa • Callback Hell • Promise/Deferred
32. Promise/Deferred • Promise/Deferred • .then() • Resolve • Reject
33. Promise/Deferred (Cont’d) AngularJS’s promise/deferred implementation inspired by Kris Kowal's Q.
34. Before Diving in koa • Callback Hell • Promise/Deferred
35. Before Diving in koa • Callback Hell • Promise/Deferred • Generators
36. Generators
37. Generators • ECMAScript Harmony (6th Edition)
38. Generators • ECMAScript Harmony (6th Edition) • Chrome: about:flags ➛ Enable Experimental JavaScript
39. Generators • ECMAScript Harmony (6th Edition) • Chrome: about:flags ➛ Enable Experimental JavaScript • Firefox 33.0
40. Generators • ECMAScript Harmony (6th Edition) • Chrome: about:flags ➛ Enable Experimental JavaScript • Firefox 33.0 • Iterator
41. Generators • ECMAScript Harmony (6th Edition) • Chrome: about:flags ➛ Enable Experimental JavaScript • Firefox 33.0 • Iterator • next()
42. Generators • ECMAScript Harmony (6th Edition) • Chrome: about:flags ➛ Enable Experimental JavaScript • Firefox 33.0 • Iterator • next() • throw StopIteration
43. Generators • ECMAScript Harmony (6th Edition) • Chrome: about:flags ➛ Enable Experimental JavaScript • Firefox 33.0 • Iterator • next() • throw StopIteration https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Iterators_and_Generators
44. Generators • ECMAScript Harmony (6th Edition) • Chrome: about:flags ➛ Enable Experimental JavaScript • Firefox 33.0 • Iterator • next() • throw StopIteration • yield
45. Generators • ECMAScript Harmony (6th Edition) • Chrome: about:flags ➛ Enable Experimental JavaScript • Firefox 33.0 • Iterator • next() • throw StopIteration • yield https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Iterators_and_Generators
46. Andre Lee next generation web framework for node.js koa
47. Andre Lee next generation web framework for node.js koa
48. Before Diving in koa • Callback Hell • Promise/Deferred • Generators
49. Before Diving in koa • Callback Hell • Promise/Deferred • Generators • thunkify
50. thunkify http://jsbin.com/jayup/edit https://github.com/tj/node-thunkify/blob/master/index.js
51. thunkify https://github.com/tj/node-thunkify/blob/master/index.js
52. thunkify https://github.com/tj/node-thunkify/blob/master/index.js
53. thunkify http://jsbin.com/xubajo/edit // 3 // 4 https://github.com/tj/node-thunkify/blob/master/index.js
54. thunkify http://jsbin.com/xubajo/edit // 3 // 4 // 3 https://github.com/tj/node-thunkify/blob/master/index.js
55. thunkify co will execute next() when callback http://jsbin.com/xubajo/edit // 3 // 4 // 3 https://github.com/tj/node-thunkify/blob/master/index.js
56. Before Diving in koa • Callback Hell • Promise/Deferred • Generators • thunkify
57. Before Diving in koa • Callback Hell • Promise/Deferred • Generators • thunkify • Yieldables
58. Yieldables • promises • thunks (functions) • array (parallel execution) • objects (parallel execution) • generators (delegation) • generator functions (delegation)
59. agenda • What is koa • Before Diving in koa • Hello koa • Running koa in Production?
60. Hello koa
61. Hello koa • Requires node 0.11.x for the --harmony flag
62. Hello koa • Requires node 0.11.x for the --harmony flag • Application
63. Hello koa • Requires node 0.11.x for the --harmony flag • Application • To provide high level "sugar" at the otherwise low-level middleware layer
64. Hello koa • Requires node 0.11.x for the --harmony flag • Application • To provide high level "sugar" at the otherwise low-level middleware layer • Cascading
65. Hello koa • Requires node 0.11.x for the --harmony flag • Application • To provide high level "sugar" at the otherwise low-level middleware layer • Cascading • Settings
66. Hello koa • Requires node 0.11.x for the --harmony flag • Application • To provide high level "sugar" at the otherwise low-level middleware layer • Cascading • Settings
67. Hello koa • Requires node 0.11.x for the --harmony flag • Application • To provide high level "sugar" at the otherwise low-level middleware layer • Cascading • Settings • app.listen(...)
68. Hello koa • Requires node 0.11.x for the --harmony flag • Application • To provide high level "sugar" at the otherwise low-level middleware layer • Cascading • Settings • app.listen(...) • app.callback()
69. Hello koa • Requires node 0.11.x for the --harmony flag • Application • To provide high level "sugar" at the otherwise low-level middleware layer • Cascading • Settings • app.listen(...) • app.callback() • app.use(function)
70. Hello koa • Requires node 0.11.x for the --harmony flag • Application • To provide high level "sugar" at the otherwise low-level middleware layer • Cascading • Settings • app.listen(...) • app.callback() • app.use(function) • app.keys=
71. Hello koa • Requires node 0.11.x for the --harmony flag • Application • To provide high level "sugar" at the otherwise low-level middleware layer • Cascading • Settings • app.listen(...) • app.callback() • app.use(function) • app.keys= • Error Handling
72. Hello koa (Cont’d)
73. Hello koa (Cont’d) • Context
74. Hello koa (Cont’d) • Context
75. Hello koa (Cont’d) • Context ctx.req ➛ node’s request ctx.res ➛ node’s response ctx.request ➛ koa’s request ctx.response ➛ koa’s response
76. Hello koa (Cont’d) • Context • MVC
77. Hello koa (Cont’d) • Context • MVC • koa-* wiki
78. Hello koa (Demo) • 00_hello_world.js • 01_cascading.js • 02_thunkify.js • 03_routing.js • 04_error_handling.js • 05_request.js • 06_mongo.js • 07_redis.js • 08_ejs.js
79. agenda • What is koa • Before Diving in koa • Hello koa • Running koa in Production?
80. Running koa in Production?
81. Running koa in Production? • TJ for GO lang, Express to Strongloop
82. Running koa in Production? • TJ for GO lang, Express to Strongloop • Using co’s ecosystem
83. Running koa in Production? • TJ for GO lang, Express to Strongloop • Using co’s ecosystem • Node.js v0.11.x is unstable
84. Running koa in Production? • TJ for GO lang, Express to Strongloop • Using co’s ecosystem • Node.js v0.11.x is unstable • Generators
85. Running koa in Production? • TJ for GO lang, Express to Strongloop • Using co’s ecosystem • Node.js v0.11.x is unstable • Generators • Better Performance?
86. Running koa in Production? • TJ for GO lang, Express to Strongloop • Using co’s ecosystem • Node.js v0.11.x is unstable • Generators • Better Performance? from https://medium.com/javascript-and-the-server
87. Running koa in Production? • TJ for GO lang, Express to Strongloop • Using co’s ecosystem • Node.js v0.11.x is unstable • Generators • Better Performance?
88. References • http://callbackhell.com/ • http://www.html-js.com/article/1752 • https://medium.com/javascript-and-the-server/ trying-out-node-0-11-in-production-3d8135e0f3da
89. Andre Lee ?