使用 Retrofit、Moshi 和 Kotlin 展开封装响应

Question

我正在使用一个 API 的 returns 回复，看起来像：

{
  "irrelevantStuff": {},
  "data": [] 
}

我想遵循 this presentation from Jake 中演示的方法，他在其中创建了一个 Retrofit 转换器工厂来处理和解包信封类型。唯一的问题是显示的方法使用 Gson 和 Java，而我正在尝试使用 Moshi 和 Kotlin。

我已将我的信封类型声明为：

data class Envelope<T>(val data: T)

任何我的转换器工厂为：

object EnvelopeConverter : Converter.Factory() {

  override fun responseBodyConverter(
      type: Type,
      annotations: Array<Annotation>,
      retrofit: Retrofit
  ): Converter<ResponseBody, *>? {

    val envelopedType = Types.newParameterizedType(Envelope::class.java, type)
    val delegate: Converter<ResponseBody, Envelope<Any>>? =
        retrofit.nextResponseBodyConverter(this, envelopedType, annotations)

    return Unwrapper(delegate)
  }

  private class Unwrapper<T>(
      private val delegate: Converter<ResponseBody, Envelope<T>>?
  ) : Converter<ResponseBody, T> {

    override fun convert(value: ResponseBody): T? {
      return delegate?.convert(value)?.data
    }
  }
}

Retrofit 已配置为：

val retrofit: Retrofit = Retrofit.Builder()
    .baseUrl(currentEndpoint.url)
    .addConverterFactory(EnvelopeConverter)
    .addConverterFactory(MoshiConverterFactory.create(Moshi.Builder().add(KotlinJsonAdapterFactory()).build()))
    .build()

但是当执行请求时，我收到如下所示的异常。值得注意的是，此转换器 在使用 moshi-kotlin-codegen 依赖项 时工作正常。它只是 moshi-kotlin 基于反射的库有问题。这是什么原因？

java.lang.AssertionError: Built-in class kotlin.Any is not found
        at kotlin.reflect.jvm.internal.impl.builtins.KotlinBuiltIns.invoke(KotlinBuiltIns.java:113)
        at kotlin.reflect.jvm.internal.impl.builtins.KotlinBuiltIns.invoke(KotlinBuiltIns.java:108)
        at kotlin.reflect.jvm.internal.impl.storage.LockBasedStorageManager$MapBasedMemoizedFunction.invoke(LockBasedStorageManager.java:440)
        at kotlin.reflect.jvm.internal.impl.storage.LockBasedStorageManager$MapBasedMemoizedFunctionToNotNull.invoke(LockBasedStorageManager.java:515)
        at kotlin.reflect.jvm.internal.impl.builtins.KotlinBuiltIns.getBuiltInClassByName(KotlinBuiltIns.java:362)
        at kotlin.reflect.jvm.internal.impl.builtins.KotlinBuiltIns.getAny(KotlinBuiltIns.java:367)
        at kotlin.reflect.jvm.internal.impl.builtins.KotlinBuiltIns.getAnyType(KotlinBuiltIns.java:642)
        at kotlin.reflect.jvm.internal.impl.builtins.KotlinBuiltIns.getNullableAnyType(KotlinBuiltIns.java:647)
        at kotlin.reflect.jvm.internal.impl.builtins.KotlinBuiltIns.getDefaultBound(KotlinBuiltIns.java:652)
        at kotlin.reflect.jvm.internal.impl.serialization.deserialization.descriptors.DeserializedTypeParameterDescriptor.resolveUpperBounds(DeserializedTypeParameterDescriptor.kt:45)
        at kotlin.reflect.jvm.internal.impl.descriptors.impl.AbstractTypeParameterDescriptor$TypeParameterTypeConstructor.computeSupertypes(AbstractTypeParameterDescriptor.java:154)
        at kotlin.reflect.jvm.internal.impl.types.AbstractTypeConstructor$supertypes.invoke(AbstractTypeConstructor.kt:34)
        at kotlin.reflect.jvm.internal.impl.types.AbstractTypeConstructor$supertypes.invoke(AbstractTypeConstructor.kt:22)
        at kotlin.reflect.jvm.internal.impl.storage.LockBasedStorageManager$LockBasedLazyValue.invoke(LockBasedStorageManager.java:346)
        at kotlin.reflect.jvm.internal.impl.storage.LockBasedStorageManager$LockBasedNotNullLazyValue.invoke(LockBasedStorageManager.java:402)
        at kotlin.reflect.jvm.internal.impl.types.AbstractTypeConstructor.getSupertypes(AbstractTypeConstructor.kt:23)
        at kotlin.reflect.jvm.internal.impl.descriptors.impl.AbstractTypeParameterDescriptor.getUpperBounds(AbstractTypeParameterDescriptor.java:116)
        at kotlin.reflect.jvm.internal.impl.types.typeUtil.TypeUtilsKt.getRepresentativeUpperBound(TypeUtils.kt:237)
        at kotlin.reflect.jvm.internal.impl.resolve.jvm.InlineClassManglingRulesKt.isTypeParameterWithUpperBoundThatRequiresMangling(inlineClassManglingRules.kt:44)
        at kotlin.reflect.jvm.internal.impl.resolve.jvm.InlineClassManglingRulesKt.requiresFunctionNameMangling(inlineClassManglingRules.kt:37)
        at kotlin.reflect.jvm.internal.impl.resolve.jvm.InlineClassManglingRulesKt.shouldHideConstructorDueToInlineClassTypeValueParameters(inlineClassManglingRules.kt:23)
        at kotlin.reflect.jvm.internal.KFunctionImpl.createConstructorCaller(KFunctionImpl.kt:145)
        at kotlin.reflect.jvm.internal.KFunctionImpl.access$createConstructorCaller(KFunctionImpl.kt:36)
        at kotlin.reflect.jvm.internal.KFunctionImpl$caller.invoke(KFunctionImpl.kt:80)
        at kotlin.reflect.jvm.internal.KFunctionImpl$caller.invoke(KFunctionImpl.kt:36)
        at kotlin.reflect.jvm.internal.ReflectProperties$LazyVal.invoke(ReflectProperties.java:62)
        at kotlin.reflect.jvm.internal.ReflectProperties$Val.getValue(ReflectProperties.java:31)
        at kotlin.reflect.jvm.internal.KFunctionImpl.getCaller(Unknown Source:7)
        at kotlin.reflect.jvm.ReflectJvmMapping.getJavaMethod(ReflectJvmMapping.kt:62)
        at kotlin.reflect.jvm.KCallablesJvm.setAccessible(KCallablesJvm.kt:82)
        at com.squareup.moshi.kotlin.reflect.KotlinJsonAdapterFactory.create(KotlinJsonAdapter.kt:221)
        at com.squareup.moshi.Moshi.adapter(Moshi.java:138)
        at com.squareup.moshi.Moshi.adapter(Moshi.java:98)
        at retrofit2.converter.moshi.MoshiConverterFactory.responseBodyConverter(MoshiConverterFactory.java:91)
        at retrofit2.Retrofit.nextResponseBodyConverter(Retrofit.java:352)
E/AndroidRuntime:     at codes.chrishorner.socketweather.data.EnvelopeConverter.responseBodyConverter(EnvelopeConverter.kt:19)
        at retrofit2.Retrofit.nextResponseBodyConverter(Retrofit.java:352)
        at retrofit2.Retrofit.responseBodyConverter(Retrofit.java:335)
        at retrofit2.HttpServiceMethod.createResponseConverter(HttpServiceMethod.java:113)
        at retrofit2.HttpServiceMethod.parseAnnotations(HttpServiceMethod.java:82)
        at retrofit2.ServiceMethod.parseAnnotations(ServiceMethod.java:37)
        at retrofit2.Retrofit.loadServiceMethod(Retrofit.java:192)
        at retrofit2.Retrofit.invoke(Retrofit.java:149)
        at java.lang.reflect.Proxy.invoke(Proxy.java:1006)
        at $Proxy1.searchForLocation(Unknown Source)
        at codes.chrishorner.socketweather.MainActivity$onStart.invokeSuspend(MainActivity.kt:46)
        at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
        at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:56)
        at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:561)
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:727)
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:667)
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:655)

Answer 1

原来我被一些过度优化的复制粘贴诅咒了！

在我的应用程序模块的 build.gradle 文件中，我包含了：

packagingOptions {
  exclude 'kotlin/**'
  exclude '**/*.kotlin_metadata'
  exclude 'META-INF/*.kotlin_module'
  exclude 'META-INF/*.version'
}

exclude 'kotlin/**' 是罪魁祸首。

这个故事的寓意：小心复制和粘贴！

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