【发布时间】:2023-06-08 19:49:01
【问题描述】:
我有一个功能分支,我从休息服务加载数据。对于两个请求,这绝对按预期工作,但对于一个请求,我总是得到一个 NoTransformationFoundException。
我正在像这样创建 http 客户端:
private val httpClient =
HttpClient(OkHttp) {
install(JsonFeature) {
serializer = GsonSerializer()
}
}
在上面你看到我正在使用带有 gson 的 okhttp。只是为了让问题更容易调试,这里是我的 ktor 依赖项:
compile "io.ktor:ktor-client-okhttp:1.2.6"
compile "io.ktor:ktor-client-json:1.2.6"
compile "io.ktor:ktor-client-gson:1.2.6"
下面的请求对我来说很好。 Here is the relevant documentation(包括响应 JSON):
data class Vendors(val vendors: List<Vendor>)
data class Vendor(
val id: String,
val name: String,
val roles: List<String>
)
fun fetchVendors() = runBlocking {
httpClient.get<Vendors>("https://api.amazonalexa.com/v1/vendors") {
headers.append("Authorization", "Bearer $accessToken")
}?.vendors
}
更新:我知道一定有区别:上面的内容类型是application/json
但是这个调用(获取技能,使用documentation here)一直失败:
data class Skills(
val isTruncated: Boolean,
val skills: List<Skill>
)
data class Skill(
val apis: List<String>,
val asin: String,
val lastUpdated: String,
val nameByLocale: Map<String, String>,
val publicationStatus: String,
val skillId: String,
val stage: String
)
fun fetchSkills(vendor: String) = runBlocking {
httpClient.get<Skills>("https://api.amazonalexa.com/v1/skills?vendorId=$vendor") {
headers.append("Authorization", "Bearer $accessToken")
}.skills
}
更新:这是响应内容类型:application/json+hal
我不明白为什么一个工作,而另一个失败,这个例外:
Exception in thread "main" io.ktor.client.call.NoTransformationFoundException: No transformation found: class kotlinx.coroutines.io.ByteBufferChannel -> class my.package.name.Skills
at io.ktor.client.call.HttpClientCall.receive(HttpClientCall.kt:88)
at my.package.name.AmazonApi$fetchSkills$1.invokeSuspend(AmazonApi.kt:200)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
at io.ktor.util.pipeline.SuspendFunctionGun.resumeRootWith(PipelineContext.kt:215)
at io.ktor.util.pipeline.SuspendFunctionGun.loop(PipelineContext.kt:172)
at io.ktor.util.pipeline.SuspendFunctionGun.access$loop(PipelineContext.kt:67)
at io.ktor.util.pipeline.SuspendFunctionGun$continuation$1.resumeWith(PipelineContext.kt:122)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:46)
at io.ktor.util.pipeline.SuspendFunctionGun.resumeRootWith(PipelineContext.kt:215)
at io.ktor.util.pipeline.SuspendFunctionGun.loop(PipelineContext.kt:172)
at io.ktor.util.pipeline.SuspendFunctionGun.access$loop(PipelineContext.kt:67)
at io.ktor.util.pipeline.SuspendFunctionGun$continuation$1.resumeWith(PipelineContext.kt:122)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:46)
at io.ktor.util.pipeline.SuspendFunctionGun.resumeRootWith(PipelineContext.kt:215)
at io.ktor.util.pipeline.SuspendFunctionGun.loop(PipelineContext.kt:172)
at io.ktor.util.pipeline.SuspendFunctionGun.access$loop(PipelineContext.kt:67)
at io.ktor.util.pipeline.SuspendFunctionGun$continuation$1.resumeWith(PipelineContext.kt:122)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:46)
at kotlinx.coroutines.DispatchedTask.run(Dispatched.kt:241)
at kotlinx.coroutines.EventLoopImplBase.processNextEvent(EventLoop.common.kt:270)
at kotlinx.coroutines.BlockingCoroutine.joinBlocking(Builders.kt:79)
at kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking(Builders.kt:54)
at kotlinx.coroutines.BuildersKt.runBlocking(Unknown Source)
at kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking$default(Builders.kt:36)
at kotlinx.coroutines.BuildersKt.runBlocking$default(Unknown Source)
at my.package.name.AmazonApi.fetchSkills(AmazonApi.kt:131)
at my.package.name.Cli.createProject(Cli.kt:305)
at my.package.name.Cli.parseArgs(Cli.kt:208)
at my.package.name.Cli$Companion.main(Cli.kt:508)
at my.package.name.Cli.main(Cli.kt)
请给我一些提示如何解决这个问题,或者至少我可以如何调试它。顺便说一句,当我使用 String 而不是 Skill 时,我看到了预期的响应 JSON。
【问题讨论】:
-
我猜这是我在此期间发现的bug。仍然欢迎解决方法和提示。