Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
API 통신, Retrofit 대신 Ktor 어떠신가요
Search
Pangmoo
April 03, 2023
Programming
2
900
API 통신, Retrofit 대신 Ktor 어떠신가요
GDG Korea Android super.init(version=4) 발표 자료 입니다.
Pangmoo
April 03, 2023
Tweet
Share
More Decks by Pangmoo
See All by Pangmoo
게임 개발하던 학생이이 세계에선 안드로이드 개발자?
pangmoo
0
300
Compose Web 개발하기
pangmoo
0
570
코틀린으로 멀티플랫폼 만들기
pangmoo
0
1.4k
Kotlin Multiplatform으로 Android/iOS/Desktop 번역기 만들기
pangmoo
0
610
MADC 2023 Kotlin Multiplatform (KMP)
pangmoo
0
140
안드로이드 UI 상태 저장 권장사항
pangmoo
1
840
Compose로 Android&Desktop 멀티플랫폼 만들기
pangmoo
0
520
Other Decks in Programming
See All in Programming
脱Riverpod?fqueryで考える、TanStack Queryライクなアーキテクチャの可能性
ostk0069
0
570
QA x AIエコシステム段階構築作戦
osu
0
200
DMMを支える決済基盤の技術的負債にどう立ち向かうか / Addressing Technical Debt in Payment Infrastructure
yoshiyoshifujii
4
630
CDK引数設計道場100本ノック
badmintoncryer
2
580
Git Sync を超える!OSS で実現する CDK Pull 型デプロイ / Deploying CDK with PipeCD in Pull-style
tkikuc
4
470
Understanding Kotlin Multiplatform
l2hyunwoo
0
220
新しいモバイルアプリ勉強会(仮)について
uetyo
1
130
階層化自動テストで開発に機動力を
ickx
1
430
テスターからテストエンジニアへ ~新米テストエンジニアが歩んだ9ヶ月振り返り~
non0113
2
240
What's new in AppKit on macOS 26
1024jp
0
180
What's new in Adaptive Android development
fornewid
0
110
MCPで実現できる、Webサービス利用体験について
syumai
7
2.1k
Featured
See All Featured
Measuring & Analyzing Core Web Vitals
bluesmoon
7
530
Automating Front-end Workflow
addyosmani
1370
200k
Six Lessons from altMBA
skipperchong
28
3.9k
Creating an realtime collaboration tool: Agile Flush - .NET Oxford
marcduiker
30
2.2k
jQuery: Nuts, Bolts and Bling
dougneiner
63
7.8k
Building a Scalable Design System with Sketch
lauravandoore
462
33k
Building Better People: How to give real-time feedback that sticks.
wjessup
367
19k
4 Signs Your Business is Dying
shpigford
184
22k
StorybookのUI Testing Handbookを読んだ
zakiyama
30
5.9k
Music & Morning Musume
bryan
46
6.7k
実際に使うSQLの書き方 徹底解説 / pgcon21j-tutorial
soudai
PRO
181
54k
Code Reviewing Like a Champion
maltzj
524
40k
Transcript
@ @kisa002 @holykisa
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
• • •
None
None
None
None
None
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")
None
None
None
object KtorClient { val client = HttpClient(CIO) }
None
KtorClient.client .get("https://haeyum.dev/articles") .body<String>() // or bodyAsText()
None
None
None
None
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" }
@Serializable data class Article( val id: String, val title: String,
val content: String )
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 } } }
None
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") } })
None
None
None
None
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())
None
None
None
None
None
None
None
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)
@Serializable data class Article( val title: String, val content: String
)
None
None
• • •
object KtorClient { val client = HttpClient(CIO) { install(ContentNegotiation) {
json(Json { ignoreUnknownKeys = true coerceInputValues = true prettyPrint = true isLenient = true // ... }) } } }
• • • • • • • •
None
None
None
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() ) }
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() }
None
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) } } }
None
• • •
implementation("io.ktor:ktor-client-mock:2.2.4") testImplementation("io.ktor:ktor-client-mock:2.2.4")
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) } }
val client = HttpClient(CIO) { install(ContentNegotiation) { json() } defaultRequest
{ header("versionName", BuildConfig.VERSION_NAME) header("versionCode", BuildConfig.VERSION_CODE) } } 실제 서버 사용 시
val client = HttpClient(mockEngine) { install(ContentNegotiation) { json() } defaultRequest
{ header("versionName", BuildConfig.VERSION_NAME) header("versionCode", BuildConfig.VERSION_CODE) } } Mock 사용 시
suspend fun fetchArticlesKtor(): List<Article> = runCatching { KtorClient .client .get("https://haeyum.dev/articles")
.body<List<Article>>() }.getOrDefault(emptyList())
None
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()
None
None
None
None
None
None
None
[email protected]
@ @kisa002 @holykisa