Reacting to Change - API Days 2014

Transcript

1. REACTING TO CHANGE ! KYLE FULLER

2. BUILDING better API CLIENTS

3. None
4. None

5. DOZENS of APPS

6. HTTP / APIS

7. THERE’S AN API

8. COMPONENTS OF AN API CLIENT

9. perform(.RetrieveArticles) { result in switch result { case .Success(let representor):

   /* We've got some articles */ case .Error(let error): /* We hit an error */ } }

10. FOUNDATION

11. NSURLSession OR NSURLConnection

12. NSURLRequest

13. NSURLHTTPResponse

14. SIMPLE...

15. HTTP SEMANTICS

16. SERIALISATION (JSON)

17. CONVERT to VALUE-MODELS

18. struct Article { let title:String let body:String let author:Author let

    image:[NSURL] } struct Author { let name:String let twitter:String }

19. articles[0]["author"]["name"]

20. "/articles"

21. "name"

22. "nme"

23. - age + birthday

24. None
25. None

26. MAPPING

27. HTTP JSON MODEL MAPPING TESTS (STUBS & FIXTURES) DOMAIN LOGIC?

28. $ cloc **Model**.{h,m} **API**.{h,m} 95 text files. 83 unique files.

    0 files ignored. ------------------------------------------------------------------------------- Language files blank comment code ------------------------------------------------------------------------------- Objective C 51 1420 499 5598 C/C++ Header 32 258 480 479 ------------------------------------------------------------------------------- SUM: 83 1678 979 6077 -------------------------------------------------------------------------------

29. 6077 LINES OF CODE

30. ANDROID

31. 15,000 LINES OF CODE

32. WINDOWS PHONE

33. 20,000 LINES OF CODE

34. ...

35. 30,000 LINES OF CODE

36. BUILDING an API CLIENT

37. DOMAIN-SPECIFIC

38. INTEGRATED

39. MIXING PROTOCOL SEMANTICS

40. WHAT DOES THE API LOOK LIKE?

41. None
42. None
43. None

44. GETTING STARTED

45. TESTS

46. MOCK

47. [OHHTTPStubs stubRequestsPassingTest:^BOOL(NSURLRequest *request) { return ([request.URL.host isEqualToString:@"trunk.cocoapods.org"] && [request.URL.path isEqualToString:@"/api/v1/sessions"]);

    } withStubResponse:^ OHHTTPStubsResponse *(NSURLRequest *request) { NSString *fixture = OHPathForFileInBundle(@"sessions.json", nil); NSDictionary *headers = @{ @"Content-Type": @"application/json" }; return [OHHTTPStubsResponse responseWithFileAtPath:fixture statusCode:200 headers:headers]; }];

48. { "created_at": "2014-04-21 23:08:00 +0200", "email": "kyle@cocoapods.org", "name": "Kyle Fuller",

    "sessions": [ { "created_at": "2014-05-04 15:20:19 +0200", "valid_until": "2014-09-09 15:20:19 +0200", "verified": false }, { "created_at": "2014-05-04 15:20:20 +0200", "valid_until": "2014-09-09 15:20:20 +0200", "verified": true } ] }

49. AND REPEAT

50. None

51. CAN’T WE USE THIS?

52. UNDERSTANDABLE by machines

53. POWERING YOUR TESTS with API BLUEPRINT

54. pod `CCLRequestReplay`

55. [OHHTTPStubs stubRequestsPassingTest:^BOOL(NSURLRequest *request) { return ([request.URL.host isEqualToString:@"trunk.cocoapods.org"] && [request.URL.path isEqualToString:@"/api/v1/sessions"]);

    } withStubResponse:^ OHHTTPStubsResponse *(NSURLRequest *request) { NSString *fixture = OHPathForFileInBundle(@"sessions.json", nil); NSDictionary *headers = @{ @"Content-Type": @"application/json" }; return [OHHTTPStubsResponse responseWithFileAtPath:fixture statusCode:200 headers:headers]; }]; [OHHTTPStubs stubRequestsPassingTest:^BOOL(NSURLRequest *request) { return ([request.URL.host isEqualToString:@"trunk.cocoapods.org"] && [request.URL.path isEqualToString:@"/api/v1/pods"]); } withStubResponse:^ OHHTTPStubsResponse *(NSURLRequest *request) { NSString *fixture = OHPathForFileInBundle(@"pods.json", nil); NSDictionary *headers = @{ @"Content-Type": @"application/json" }; return [OHHTTPStubsResponse responseWithFileAtPath:fixture statusCode:200 headers:headers]; }]; [OHHTTPStubs stubRequestsPassingTest:^BOOL(NSURLRequest *request) { return ([request.URL.host isEqualToString:@"trunk.cocoapods.org"] && [request.URL.path isEqualToString:@"/api/v1/pod/../owners"]); } withStubResponse:^ OHHTTPStubsResponse *(NSURLRequest *request) { NSString *fixture = OHPathForFileInBundle(@"pod-querykit-owners.json", nil); NSDictionary *headers = @{ @"Content-Type": @"application/json" }; return [OHHTTPStubsResponse responseWithFileAtPath:fixture statusCode:200 headers:headers]; }]; ...

56. { "created_at": "2014-04-21 23:08:00 +0200", "email": "kyle@cocoapods.org", "name": "Kyle Fuller",

    "sessions": [ { "created_at": "2014-05-04 15:20:19 +0200", "valid_until": "2014-09-09 15:20:19 +0200", "verified": false }, { "created_at": "2014-05-04 15:20:20 +0200", "valid_until": "2014-09-09 15:20:20 +0200", "verified": true } ] } { "name": "QueryKit", "version": "0.8.3", "authors": { "Kyle Fuller": "inbox@kylefuller.co.uk" }, "social_media_url": "http://twitter.com/kylefuller", "source": { "git": "https://github.com/QueryKit/QueryKit.git", "tag": "0.8.3" }, "source_files": [ "QueryKit/*.{h}", "QueryKit/ObjectiveC/*.{h,m}" ], "requires_arc": true } ...

57. let URL = NSBundle.mainBundle().URIForResource("palaver", withExtension:"apib.json") requestReplayManager.addRecordings(fromBlueprintURL:URL, error:nil)

58. GET /sessions

59. None

60. EMBRACE CHANGE

61. None

62. WE MADE A MISTAKE.

63. WE WANT TO CHANGE... ENDPOINT URI.

64. NEGOTIATE AT RUN-TIME

65. WE WANT TO CHANGE... PAGINATION LOGIC.

66. FOLLOWING LINKS

67. TRANSITION BETWEEN STATES

68. "Paging is achieved with the published_before parameter."

69. published_before

70. [ { "published_date": "2013-04-30T16:05:45+00:00", ... } ]

71. GET /articles?published_before=2013-04-30T16:05:45+00:00

72. SERVER LOGIC

73. Next Page = <some URI>

74. Prevent BREAKING CHANGES

75. BUILDING BETTER CLIENTS from THE API

76. FLEXIBILITY

77. CASCADED REQUESTS

78. GET /categories GET /authors GET /articles

79. BANDWIDTH

80. LARGE DATA

81. $ curl -I http://api.something.com/articles HTTP/1.1 200 OK Content-Type: application/json Content-Length:

    12524998

82. BREAK IT UP

83. PAGINATION

84. /list VS /list/detail

85. USE Last-Modified

86. USE Cache-Control

87. USE STANDARDS

88. LET’S BUILD BETTER APIS TOGETHER

89. KYLE FULLER