Du GraphQL 100% Kotlin avec Apollo-Android

Transcript

1. Du GraphQL 100% Kotlin Avec Apollo-Android Talking.kt - 2020 1
2. Du GraphQL 100% Kotlin avec Apollo-Android @martinbonnin 2
3. Kotlin 3 Graphql Moderne Typage fort Null safe Des outils Moderne Typage fort Null safe Des outils ❤
4. Moderne 4 • Query Language • 2012: Facebook • 2015: Release publique • 2018: Linux Foundation • https://github.com/graphql/graphql-spec
5. • Objets • Scalaires ◦ Boolean ◦ Int ◦ Float ◦ String Typage fort 5 type User { login: String bio: String isBountyHunter: Boolean status: UserStatus issueComments: List<IssueComment> } User Github
6. • Objets • Scalaires ◦ Boolean ◦ Int ◦ Float ◦ String Typage fort 6 type User { login: String bio: String isBountyHunter: Boolean status: UserStatus issueComments: List<IssueComment> } User Github
7. • Objets • Scalaires ◦ Boolean ◦ Int ◦ Float ◦ String Typage fort 7 type User { login: String bio: String isBountyHunter: Boolean status: UserStatus issueComments: List<IssueComment> } User Github
8. • Objets • Scalaires ◦ Boolean ◦ Int ◦ Float ◦ String Typage fort 8 type User { login: String bio: String isBountyHunter: Boolean status: UserStatus issueComments: List<IssueComment> } User Github
9. • Objets • Scalaires ◦ Boolean ◦ Int ◦ Float ◦ String Typage fort 9 type User { login: String bio: String isBountyHunter: Boolean status: UserStatus issueComments: List<IssueComment> } User Github
10. • Mais aussi: ◦ Interfaces ◦ Listes ◦ Enums ◦ Unions Typage fort 10 type User implements Node { id: ID! login: String bio: String [...] } User Github
11. Null safety ❗ 11 type User { login: String❗ bio: String isBountyHunter: Boolean❗ status: UserStatus issueComments: List<IssueComment>❗ }
12. Schema 12 { "data" { "__schema": { "types": [ { "kind": "OBJECT", "name": "User", "description": "A user is an individual..", "fields": [...], "interfaces": [...], }, [...] ] } }
13. 13 OUTILS https://apis.guru/graphql-voyager/ https://developer.github.com/v4/explorer/
14. En pratique... 14
15. • Générateur automatique Apollo-Android 15 user.graphql Schema.json UserQuery.kt
16. Apollo-Android 16 query { viewer { login bio status { emoji message } } } data class Viewer( val __typename: String = "User", /** * The username used to login. */ val login: String, /** * The user's public profile bio. */ val bio: String?, /** * The user's description of what they're currently doing. */ val status: UserQuery.Status? )
17. Depreciation 17 query { pinnedRepositories { nodes { id } } } /** * A list of repositories this user has pinned to their profile */ @Deprecated(message = "pinnedRepositories will be removed Use ProfileOwner.pinnedItems instead. Removal on 2019-10-01 UTC.") val pinnedRepositories: PinnedRepositories
18. Runtime 18 val client = ApolloClient.builder() .serverUrl("https://api.github.com/graphql") .build() val viewer = runBlocking { client.query(UserQuery()) .toDeferred() .await() .data() .viewer() }
19. • Parsing Json • Requête HTTP • Coroutines • Cache Runtime 19 • Android/JVM • MPP ?
20. • Rajout d’une dépendance • https://github.com/square/okhttp/issu es/4723 Java -> Kotlin MPP 20
21. • Compatibilité source/binaire ◦ Checked exception ◦ Methodes et classes finales ◦ Optionel par defaut ◦ Les data class explosent la surface d’API ◦ @JvmField • Japicmp Java -> Kotlin MPP 21
22. • Modèles + Parsing ✅ • Runtime + Cache ❌ Java -> Kotlin MPP 22
23. Kotlin + Graphql = ❤ Typage fort du backend au frontend Bientôt MPP 23
24. Merci ! @martinbonnin 24
25. • Graphql-kotlin (Expedia) • https://github.com/ExpediaGroup/graphql-kotlin • https://www.youtube.com/watch?v=7YJyPXjLdug Server side 25
26. • HTTP cache • Normalized cache ◦ In Memory ◦ SQLLite Cache 26
27. runBlocking { client.subscribe(UserSubscription()) .toFlow() .collect { // do something with data } } Subscriptions 27