Retrofit to Ktor

ktor을 써야하는 이유 💡

• KMM을 사용해서 앱을 만든다고 생각해보자. ios에서는 java/android 기반인 Retrofit을 사용할 수 없다 .근데 ktor은 되는 모양…?

• 아래와 같이 종속성을 추가해줍시다

plugins {
    ...
    kotlin("plugin.serialization") version "1.7.10"
    ...
}

dependencies {
    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.3.2")
    implementation("io.ktor:ktor-client-core:$ktorVersion")
    // CIO - for JVM and Android
    implementation("io.ktor:ktor-client-cio:$ktorVersion")
    implementation("io.ktor:ktor-client-content-negotiation:$ktorVersion")
    implementation("io.ktor:ktor-serialization-kotlinx-json:$ktorVersion")
}

• 모든 데이터 클래스에 @SerialName & key_name 추가

@Serializable
data class Result(
    @SerialName(value = "address_components")
    val addressComponents: List? = null,
    @SerialName(value = "adr_address")
    val adrAddress: String? = null,
    @SerialName(value = "formatted_address")
    val formattedAddress: String,
    @SerialName(value = "formatted_phone_number")
    val formattedPhoneNumber: String? = null,
    val geometry: Geometry
)

• call interface 변경

interface RetrofitPlaceDetailService {
    @GET("/maps/api/place/details/json")
    suspend fun getMapsApiPlaceDetails(
        @Query("place_id") placeId: String,
        @Query("key") key: String,
        @Nullable @Query("language") language: String? = null
    ): Response

to

object HttpRoutes {
    private const val BASE_URL = "https://maps.googleapis.com"
    const val PLACE_DETAILS = "$BASE_URL/maps/api/place/details/json"
}

try {
    val response: PlaceDetails? =
        ktorClient.get(HttpRoutes.PLACE_DETAILS) {
            parameter("place_id", placeId)
            parameter("key", apiKey)
            parameter("language", language)
        }.body()
} catch (redirectResponseException: RedirectResponseException) {
} catch (clientRequestException: ClientRequestException) {
} catch (serverResponseException: ServerResponseException) {
}
...

• http client 객체 변경

val ktorClient = HttpClient(CIO) {
        install(ContentNegotiation) {
            json(Json {
                ignoreUnknownKeys = true
                prettyPrint = true
                isLenient = true
            })
        }
    }

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