API 통신, Retrofit 대신 Ktor 어떠신가요

GDG Korea Android super.init(version=4) 발표 자료 입니다.

Transcript

1. @ @kisa002 @holykisa
19. • • •
25. implementation("com.google.code.gson:gson:2.10.1") implementation("com.squareup.retrofit2:retrofit:2.9.0") implementation("com.squareup.retrofit2:converter-gson:2.6.0")
29. object KtorClient { val client = HttpClient(CIO) }
31. KtorClient.client .get("https://haeyum.dev/articles") .body<String>() // or bodyAsText()
36. implementation("io.ktor:ktor-serialization- kotlinx-json:2.2.4") implementation("io.ktor:ktor-client-content- negotiation:2.2.4") plugins { // skip... id("org.jetbrains.kotlin.plugin.serialization") version "1.8.10" }
37. @Serializable data class Article( val id: String, val title: String, val content: String )
38. object KtorClient { val client = HttpClient(CIO) { install(ContentNegotiation) { json() } } } object KtorClient { val client = HttpClient(CIO) { install(ContentNegotiation) { json() // for json xml() // for xml cbor() // for cbor protobuf() // for protobuf } } }
40. RetrofitClient.service.getArticles().enqueue(object : Callback<List<Article>> { override fun onResponse(call: Call<List<Article>>, response: Response<List<Article>>) { println("onResponse: ${response.body()}") } override fun onFailure(call: Call<List<Article>>, t: Throwable) { println("onFailure: $t") } })
45. suspend fun fetchArticlesKtor(): List<Article> = KtorClient .client .get("https://haeyum.dev/articles") .body() suspend fun fetchArticlesKtor(): List<Article> = runCatching { KtorClient .client .get("https://haeyum.dev/articles") .body<List<Article>>() }.getOrDefault(emptyList())
53. Caused by: kotlinx.serialization.MissingFieldException: Field 'id' is required for type with serial name 'com.haeyum.ktorretrofit.Article', but it was missing at path: $[0] at path: $[0] at kotlinx.serialization.json.internal.StreamingJsonDeco der.decodeSerializableValue(StreamingJsonDecoder.kt:9 0)
54. @Serializable data class Article( val title: String, val content: String )
57. • • •
58. object KtorClient { val client = HttpClient(CIO) { install(ContentNegotiation) { json(Json { ignoreUnknownKeys = true coerceInputValues = true prettyPrint = true isLenient = true // ... }) } } }
59. • • • • • • • •
63. class VersionInterceptor(private val versionName: String, private val versionCode: String) : Interceptor { override fun intercept(chain: Interceptor.Chain): Response = chain.proceed( chain .request() .newBuilder() .addHeader("versionName", versionName) .addHeader("versionCode", versionCode) .build() ) }
64. val retrofit = Retrofit.Builder() .baseUrl(BASE_URL) .client(provideOkHttpClient(BuildConfig.VERSION_NAME, BuildConfig.VERSION_CODE)) .addConverterFactory(GsonConverterFactory.create()) .build() val service = retrofit.create(RetrofitService::class.java) private fun provideOkHttpClient(versionName: String, versionCode: String): OkHttpClient { return OkHttpClient.Builder() .addInterceptor(VersionInterceptor(versionName, versionCode)) .build() }
66. object KtorClient { val client = HttpClient(CIO) { install(ContentNegotiation) { json() } } } object KtorClient { val client = HttpClient(CIO) { install(ContentNegotiation) { json() } defaultRequest { header("versionName", BuildConfig.VERSION_NAME) header("versionCode", BuildConfig.VERSION_CODE) } } }
68. • • •
69. implementation("io.ktor:ktor-client-mock:2.2.4") testImplementation("io.ktor:ktor-client-mock:2.2.4")
70. val mockEngine = MockEngine { request -> val articles = listOf( Article("First", "First article"), Article("Second", "This is Mock!"), Article("GDG Korea Android!", "Ktor is awesome!"), ) val headers = headersOf("Content-Type" to listOf(ContentType.Application.Json.toString())) when (request.url.encodedPath) { "/articles" -> respond(Json.encodeToString(articles), headers = headers) else -> respond("Not Found", HttpStatusCode.NotFound) } }
71. val client = HttpClient(CIO) { install(ContentNegotiation) { json() } defaultRequest { header("versionName", BuildConfig.VERSION_NAME) header("versionCode", BuildConfig.VERSION_CODE) } } 실제 서버 사용 시
72. val client = HttpClient(mockEngine) { install(ContentNegotiation) { json() } defaultRequest { header("versionName", BuildConfig.VERSION_NAME) header("versionCode", BuildConfig.VERSION_CODE) } } Mock 사용 시
73. suspend fun fetchArticlesKtor(): List<Article> = runCatching { KtorClient .client .get("https://haeyum.dev/articles") .body<List<Article>>() }.getOrDefault(emptyList())
75. when (request.url.encodedPath) { "/articles" -> respond(Json.encodeToString(articles), headers = headers) "/article" -> { request.url.parameters["id"]?.toIntOrNull()?.let { id -> articles.getOrNull(id)?.let { respond(Json.encodeToString(it), headers = headers) } ?: respond("Not Found", HttpStatusCode.NotFound) } ?: respond("Bad Request", HttpStatusCode.BadRequest) } else -> respond("Not Found", HttpStatusCode.NotFound) } val article = kotlin.runCatching { KtorClient .client .get("/article") { parameter("id", 2) } .body<Article>() }.getOrNull()
83. vnycall74@naver.com @ @kisa002 @holykisa