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Add streaming JsonConverter for retrofit
This implements for Jake Wharton's converter as streaming variant (only one direction). For now that's all we need. JakeWharton/retrofit2-kotlinx-serialization-converter#43
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plugins { | ||
id("android-library-base") | ||
id("android-library-unit-test") | ||
id("android-library-release") | ||
alias(libs.plugins.kotlin.serialization.plugin) | ||
} | ||
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dependencies { | ||
implementation(libs.kotlinx.serialization) | ||
implementation(libs.retrofit.serialization) | ||
implementation(libs.okhttp) | ||
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testImplementation(libs.kotlinx.serialization) | ||
testImplementation(libs.okhttp.mockwebserver) | ||
} |
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...-retrofit/src/main/kotlin/de/sipgate/dachlatten/retrofit/StreamingJsonConverterFactory.kt
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package de.sipgate.dachlatten.retrofit | ||
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import kotlinx.serialization.ExperimentalSerializationApi | ||
import kotlinx.serialization.json.Json | ||
import kotlinx.serialization.json.decodeFromStream | ||
import kotlinx.serialization.json.encodeToStream | ||
import kotlinx.serialization.serializer | ||
import okhttp3.MediaType | ||
import okhttp3.RequestBody | ||
import okhttp3.RequestBody.Companion.toRequestBody | ||
import okhttp3.ResponseBody | ||
import retrofit2.Converter | ||
import retrofit2.Retrofit | ||
import java.io.ByteArrayOutputStream | ||
import java.lang.reflect.Type | ||
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@JvmName("convert") | ||
@ExperimentalSerializationApi | ||
fun Json.asConverterFactory(contentType: MediaType): Converter.Factory = | ||
object : Converter.Factory() { | ||
override fun responseBodyConverter( | ||
type: Type, | ||
annotations: Array<out Annotation>, | ||
retrofit: Retrofit, | ||
) = Converter<ResponseBody, Any> { value -> | ||
this@asConverterFactory.decodeFromStream( | ||
this@asConverterFactory.serializersModule.serializer(type), | ||
value.byteStream(), | ||
) | ||
} | ||
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override fun requestBodyConverter( | ||
type: Type, | ||
parameterAnnotations: Array<out Annotation>, | ||
methodAnnotations: Array<out Annotation>, | ||
retrofit: Retrofit, | ||
) = Converter<Any, RequestBody> { value -> | ||
val stream = ByteArrayOutputStream() | ||
this@asConverterFactory.encodeToStream( | ||
this@asConverterFactory.serializersModule.serializer(type), | ||
value, | ||
stream, | ||
) | ||
stream.toByteArray().toRequestBody( | ||
contentType, | ||
0, | ||
stream.size(), | ||
) | ||
} | ||
} |
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...st/kotlin/de/sipgate/dachlatten/retrofit/KotlinSerializationConverterFactoryStringTest.kt
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package de.sipgate.dachlatten.retrofit | ||
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import kotlinx.serialization.ExperimentalSerializationApi | ||
import kotlinx.serialization.Serializable | ||
import kotlinx.serialization.json.Json | ||
import mockwebserver3.MockResponse | ||
import mockwebserver3.MockWebServer | ||
import mockwebserver3.junit5.internal.MockWebServerExtension | ||
import okhttp3.MediaType.Companion.toMediaType | ||
import org.junit.jupiter.api.Assertions.assertEquals | ||
import org.junit.jupiter.api.BeforeEach | ||
import org.junit.jupiter.api.Test | ||
import org.junit.jupiter.api.extension.ExtendWith | ||
import retrofit2.Call | ||
import retrofit2.Retrofit | ||
import retrofit2.http.Body | ||
import retrofit2.http.GET | ||
import retrofit2.http.POST | ||
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@OptIn(ExperimentalSerializationApi::class) | ||
@ExtendWith(MockWebServerExtension::class) | ||
class KotlinSerializationConverterFactoryStringTest { | ||
private lateinit var service: Service | ||
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interface Service { | ||
@GET("/") | ||
fun deserialize(): Call<User> | ||
@POST("/") | ||
fun serialize(@Body user: User): Call<Void?> | ||
} | ||
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@Serializable | ||
data class User(val name: String) | ||
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@BeforeEach | ||
fun setUp(server: MockWebServer) { | ||
val contentType = "application/json; charset=utf-8".toMediaType() | ||
val retrofit = Retrofit.Builder() | ||
.baseUrl(server.url("/")) | ||
.addConverterFactory(Json.asConverterFactory(contentType)) | ||
.build() | ||
service = retrofit.create(Service::class.java) | ||
} | ||
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@Test | ||
fun deserialize(server: MockWebServer) { | ||
server.enqueue(MockResponse().newBuilder().body("""{"name":"Bob"}""").build()) | ||
val user = service.deserialize().execute().body()!! | ||
assertEquals(User("Bob"), user) | ||
} | ||
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@Test | ||
fun serialize(server: MockWebServer) { | ||
server.enqueue(MockResponse()) | ||
service.serialize(User("Bob")).execute() | ||
val request = server.takeRequest() | ||
assertEquals("""{"name":"Bob"}""", request.body.readUtf8()) | ||
assertEquals("application/json; charset=utf-8", request.headers["Content-Type"]) | ||
} | ||
} |
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