BFFs For Swift

Many modern apps need to make 10s or even 100s or network calls just to populate the home screen. And they'll likely be calling multiple different APIs, all requiring different authentication methods, JSON parsing and aggregation. Not only does this increase battery drain and frustration for users on slow and unreliable networks, it places a huge burden on the developer that isn't easy to update or iterate on quickly.

In this talk we'll look at the Backend for Frontend pattern and see how we can leverage Swift in both our iOS applications and server applications to share code and make development faster. We'll show clear examples of how BFFs can dramatically simplify your networking code and how a BFF in Swift can help you develop iOS applications quicker by reducing context switching and being able to share code.

Transcript

1. BFFs For Swift Tim Condon @0xTim
2. BFFs For Swift @0xTim The Backend Problem General Purpose API Web Client
3. BFFs For Swift @0xTim The Backend Problem General Purpose API Web Client iOS App Android App
4. BFFs For Swift @0xTim The Backend Problem General Purpose API Web Client iOS App Android App Mobile Web Client TV Client
5. BFFs For Swift @0xTim The Backend Problem General Purpose API Web Client iOS App Android App Mobile Web Client 3rd Party Service 3rd Party Service TV Client
7. BFFs For Swift @0xTim The Backend Problem iOS App Monolith
8. BFFs For Swift @0xTim The Backend Problem iOS App Monolith Microservice
9. BFFs For Swift @0xTim The Backend Problem iOS App Microservice Microservice Microservice Microservice Microservice
10. BFFs For Swift @0xTim The Backend Problem iOS App Microservice Google API AWS API Microservice Microservice Microservice Microservice
12. BFFs For Swift @0xTim The Homescreen Problem Events Location Schedule Speakers
13. BFFs For Swift @0xTim The Homescreen Problem Events Location Schedule Speakers GET /api/events/coming-up { "page": { "totalPages": 11, "nextPage": "/api/events/coming-up?page=2&count=100" }, "events": [ { "id": "5212187e-e431-46eb-aebd-be0fccd9a2fb", "name": "dotSwift", "start": "2020-02-03T09:30:00+01:00", "end": "2020-02-03T18:30:00+01:00", "speakers": [ "e6adf697-4c6b-48e8-b5c0-27a0b305ce09", ... "fb9989a4-97b3-472e-93b5-efaf8d207dfe" ], "emcee": "9ef5e988-18cd-438b-a61b-7334986c67ec", "location": { "latitude": 48.878765, "longitude": 2.330944, "id": "a1a02cd0-2a94-425d-bd04-c2d054ce254a" } } ], ... }
14. BFFs For Swift @0xTim The Homescreen Problem Events Location Schedule Speakers GET /api/locations/a1a02cd0-2a94-425d-bd04-c2d054ce254a { "latitude": 48.878765, "longitude" 2.330944, "name": "Théâtre de Paris", "address": "15 Rue Blanche, 75009 Paris", "nearest-stations": [ { "line": "Green 12", "name": "Trinité" }, ... ] ... }
15. BFFs For Swift @0xTim The Homescreen Problem Events Location Schedule Speakers GET /api/events/5212187e-e431-46eb-aebd-be0fccd9a2fb/schedule { "talks": [ ... { "title": "BFFs For Swift", "speaker": "e6adf697-4c6b-48e8-b5c0-27a0b305ce09", "start-time": "2020-02-03T14:30:00+01:00", "end-time": "2020-02-03T14:50:00+01:00", "room": "f5536b5a-223b-4a1a-b050-836bd4e924fa" }, { "title": "Property Wrappers or How Swift decided to become Java", "speaker": "fb9989a4-97b3-472e-93b5-efaf8d207dfe", "start-time": "2020-02-03T15:30:00+01:00", "end-time": "2020-02-03T15:50:00+01:00", "room": "9a1a7f2d-230e-40e0-8757-dc80ec4aa25d" }, ... ], "breaks": { ... } }
16. BFFs For Swift @0xTim The Homescreen Problem Events Location Schedule Speakers GET /api/speakers/e6adf697-4c6b-48e8-b5c0-27a0b305ce09/ { "name": "Tim Condon", "profile-image": "https://s3-eu-central-1.amazonaws.com/ static-dotconferences-com/speakers_images/tim-condon.png", "talk": "c3d5735e-f8a3-4ca4-94c7-802c8f4306db", "bio": "Tim is the server-side Swift team lead at raywenderlich.com and has written the unofficial-official book on Vapor with the founders of the framework. He founded Broken Hands and delivers talks and workshops on Vapor and server-side Swift around the world. He also co-organises the ServerSide.swift conference.", "github": "0xTim", "twitter": "0xTim" }
17. BFFs For Swift @0xTim The Homescreen Problem Events Location Schedule Speakers GET /api/events/coming-up { "page": { "totalPages": 11, "nextPage": "/api/events/coming-up?page=2&count=10" }, "events": [ { "name": "dotSwift", "date": "2020-02-03T00:00:00+01:00", "location": { "name": "Théâtre de Paris", "address": "15 Rue Blanche, 75009 Paris", }, "onNow": { "title": "BFFs For Swift", "startTime": "2020-02-03T14:30:00+01:00", "endTime": "2020-02-03T14:50:00+01:00", "speakerName": "Tim Condon" } } ], ... }
18. BFFs For Swift @0xTim The Homescreen Problem Events Location Schedule Speakers
19. BFFs For Swift @0xTim The Homescreen Problem Events Location Schedule Speakers iOS Team API Team
21. BFFs For Swift @0xTim The Homescreen Problem Events Location Schedule Speakers
23. Backend For Frontend
24. BFFs For Swift @0xTim BFFs To The Rescue iOS App General Purpose API Weather API AWS Microservice Microservice
25. BFFs For Swift @0xTim BFF BFFs To The Rescue iOS App General Purpose API Weather API AWS Microservice Microservice
26. BFFs For Swift @0xTim BFFs To The Rescue BFF iOS App GET /api/events/coming-up { "page": { "totalPages": 11, "nextPage": "/api/events/coming-up?page=2&count=10" }, "events": [ { "name": "dotSwift", "date": "2020-02-03T00:00:00+01:00", "location": { "name": "Théâtre de Paris", "address": "15 Rue Blanche, 75009 Paris", }, "onNow": { "title": "BFFs For Swift", "startTime": "2020-02-03T14:30:00+01:00", "endTime": "2020-02-03T14:50:00+01:00", "speakerName": "Tim Condon" } } ], ... }
27. BFFs For Swift @0xTim BFF Ownership iOS App AWS API iOS BFF Microservice Microservice Microservice Android BFF Web BFF Android App Website Client
28. BFFs For Swift @0xTim BFF Ownership iOS App AWS API iOS BFF Microservice Microservice Microservice Android BFF Web BFF Android App Website Client API Team iOS Team Android Team Web Team
29. – Sam Newman, Thoughtworks “The BFF is tightly coupled to a specific user experience, and will typically be maintained by the same team as the user interface, thereby making it easier to define and adapt the API as the UI requires, while also simplifying process of lining up release of both the client and server components.”
30. BFFs For Swift @0xTim BFF Examples
31. BFFs in Swift
32. BFFs For Swift @0xTim Swift on the Server
33. BFFs For Swift @0xTim Is it ready for production?
35. BFFs For Swift @0xTim Swift in BFFs
36. BFFs For Swift @0xTim Sharing Code
37. BFFs For Swift @0xTim Sharing Code BFF Models Package BFF
38. BFFs For Swift @0xTim GET /api/events/coming-up { "page": { "totalPages": 11, "nextPage": "/api/events/coming-up?page=2&count=10" }, "events": [ { "name": "dotSwift", "date": "2020-02-03T00:00:00+01:00", "location": { "name": "Théâtre de Paris", "address": "15 Rue Blanche, 75009 Paris", }, "on-now": { “title": "BFFs For Swift", "startTime": "2020-02-03T14:30:00+01:00", "endTime": "2020-02-03T14:50:00+01:00", "speakerName": "Tim Condon" } } ], ... } struct ComingUpResponse: Codable { let page: PaginationInformation let events: [ComingUpEvent] } struct PaginationInformation: Codable { let totalPages: Int let nextPage: URL } Sharing Code
39. BFFs For Swift @0xTim Sharing Code GET /api/events/coming-up { "page": { "totalPages": 11, "nextPage": "/api/events/coming-up?page=2&count=10" }, "events": [ { "name": "dotSwift", "date": "2020-02-03T00:00:00+01:00", "location": { "name": "Théâtre de Paris", "address": "15 Rue Blanche, 75009 Paris", }, "on-now": { “title": "BFFs For Swift", "startTime": "2020-02-03T14:30:00+01:00", "endTime": "2020-02-03T14:50:00+01:00", "speakerName": "Tim Condon" } } ], ... } struct ComingUpEvent: Codable { let name: String let date: Date let location: ComingUpLocation let onNowInfo: ComingUpOnNowInfo } struct ComingUpLocation: Codable { let name: String let address: String } struct ComingUpOnNowInfo: Codable { let title: String let startTime: Date let endTime: Date let speakerName: String }
40. BFFs For Swift
41. Thank you! @0xTim