GraphQL 💙 Kotlin, 2024 edition

Transcript

1. GraphQL 💙 Kotlin LAUG - Feb 2024
2. apollographql/apollo-kotlin Hi 👋
3. The beginnings of GraphQL 3 2012: Facebook
4. GraphQL describes your product Graph 4 Feed Post Post Ad Title Text XL Thumbnail S Thumbnail
5. 5 Feed Post Post Ad Title Text XL Thumbnail S Thumbnail GraphQL
6. 6 Feed Post Post Ad Title Text XL Thumbnail S Thumbnail GraphQL
7. 7 Feed Post Post Ad Title Text XL Thumbnail S Thumbnail GraphQL
8. Le client récupère uniquement les données nécessaires No overfetching
9. Le schema décrit le type des données Strongly typed
10. Type system 10 type User { login: String bio: String isBountyHunter: Boolean status: UserStatus issueComments: List<IssueComment> }
11. • Objects Type system 11 type User { login: String bio: String isBountyHunter: Boolean status: UserStatus issueComments: List<IssueComment> }
12. • Objects • Scalars ◦ Boolean Type system 12 type User { login: String bio: String isBountyHunter: Boolean status: UserStatus issueComments: List<IssueComment> }
13. • Objects • Scalars ◦ Boolean ◦ Int ◦ Float ◦ String Type system 13 type User { login: String bio: String isBountyHunter: Boolean status: UserStatus issueComments: List<IssueComment> }
14. • Objects • Scalars ◦ Boolean ◦ Int ◦ Float ◦ String Type system 14 type User { login: String bio: String isBountyHunter: Boolean status: UserStatus issueComments: List<IssueComment> }
15. • Objects • Scalars ◦ Boolean ◦ Int ◦ Float ◦ String • Lists Type system 15 type User { login: String bio: String isBountyHunter: Boolean status: UserStatus issueComments: List<IssueComment> }
16. • Interfaces • Unions Polymorphisme 16 interface Node { id: String } type User implements Node { id: String login: String bio: String [...] }
17. Nullability! 17 type User { login: String❗ bio: String isBountyHunter: Boolean❗ status: UserStatus issueComments: List<IssueComment>❗ }
18. ❤
19. Autres propriétés de GraphQL 19 • No overfetching • Strongly typed • Introspection • No versioning • Transport agnostic
20. Mise en pratique 1 https://confetti-app.dev/sandbox/
21. apollographql/apollo-kotlin
22. Automatic code generation 22 user.graphql schema.sdl Swift, Kotlin, Golang, JS, Rust, etc...
23. Codegen 23 { sessions { nodes { language title startsAt speakers { name } } } } class Session(val nodes: List<Node>) class Node( val language: String, val title: String, val startsAt: DateTime, val speakers: List<Speaker> ) class Speaker(val name: String)
24. Depreciation 24 class Node( @Deprecated("startsAt uses non ISO 8601 format, use startDateTime instead") val startsAt: String, ) type Conference { startsAt: String @deprecated(reason: "startsAt uses non ISO 8601 format, use startDateTime instead") startDateTime: DateTime }
25. Le schema évolue progressivement et utilise les mêmes règles de depreciations que Kotlin No versioning
26. ❤
28. Mise en pratique 2
29. GraphQL vs REST REST GraphQL resources graph multiple routes single endpoint swagger/open API builtin tooling versioning continuous evolution static queries dynamic queries
30. What if GraphQL is REST?
31. Persisted queries { sessions { nodes { language title startsAt speakers { name } } } } 57e2978c855b25cf5de4ba4a0160cf7402b3f393 Enregistrement des queries pendant le build
32. Persisted queries GET confetti-app.dev/graphql?operationId=57e2978c855b25cf5de4ba4a0160cf7402b3f393 { "data": { "sessions": { "nodes": [ { "language": "en-US", "title": "Android Graphics: the Path to [UI] Riches", "startsAt": "2023-04-27T09:15", "speakers": [ { "name": "Chet Haase" }, { "name": "Romain Guy" } ] }
33. Le futur
34. A brief history of 2012 Inception at meta 2015 Open source 2018 GraphQL Foundation SDL 2021 Last spec version You are here Nullability 2024 Draft Deprecated input values Full unicode
35. Non-Null String String! Nullable String? String 🤔
36. Merci 💙 apollographql/apollo-kotlin martinbonnin https://openfeedback.io/zezxF16ZYW2DQCjMZDoj