Using Ktor results in CallNotFoundException due to work on wrong thread

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Valutazione

Difficoltà
4/5
Tempo stimato
3-5 giorni
Idoneità per principianti
30/100
Tipo di issue
Bug
Chiarezza
Da chiarire
Stato di attività
Ferma
Stack tecnologico
java, kotlin
Ambito
api, backend

Direzione di ricerca

Il report riproduce PlacesApi.placeAutocomplete(...).await() all'interno di withContext(Dispatchers.IO) e indica GaePendingResult.await nello stack trace. Inizia riproducendo la richiesta Ktor/App Engine e tracciando il modo in cui il dispatcher delle coroutine interagisce con la gestione delle richieste della libreria. Il lavoro è completato quando il problema correlato ai thread è confermato e il repository contiene una correzione supportata o indicazioni di compatibilità chiaramente documentate.

Scritto dal modello di indicizzazione a partire dal testo della issue.

Descrizione

triage me type: bug

I'm using Ktor, which is based on coroutines. This seems to be conflicting with the thread manager that the Google Maps Platform Java library uses. It keeps giving me an Unexpected exception from com.google.apphosting.api.ApiProxy$CallNotFoundException: Can't make API call urlfetch.Fetch in a thread that is neither the original request thread nor a thread created by ThreadManager error.

Environment details
  1. Specify the API at the beginning of the title (for example, "Places: ...")
  2. OS type and version
  3. Library version and other environment information

Places Autocomplete
Kotlin 1.4
0.11.0

Steps to reproduce
  1. Make a request to PlacesApi.placeAutocomplete(context, query, null).await()
Code example
fun Application.placesAutocomplete() {
    routing {
        get("/v1/places/autocomplete") {
            val parameters = call.request.queryParameters
            val query: String? = parameters["query"]
            val type: String? = parameters["type"]

            if (query == null) {
                call.respondParameterRequired("query")
                return@get
            }

            if (query.isBlank()) {
                call.respond(AutocompleteResponse(emptyList()))
                return@get
            }

            val PLACES_KEY = System.getenv("PLACES_KEY")

            val placeAutocompleteTypes = try {
                type?.let { PlaceAutocompleteType.valueOf(type) }
            } catch (e: IllegalArgumentException) {
                call.respond(HttpStatusCode.BadRequest, "Invalid place type")
                return@get
            }

            val context = GeoApiContext.Builder(GaeRequestHandler.Builder()).apiKey(PLACES_KEY).build()

            val placeAutocompleteRequest = PlacesApi.placeAutocomplete(context, query, null)
            placeAutocompleteTypes?.let { types ->
                placeAutocompleteRequest.types(types)
            }

            try {
                val placeAutocompleteResponse = withContext(Dispatchers.IO) { placeAutocompleteRequest.await() }
                val places = placeAutocompleteResponse.map {
                    val formatting = it.structuredFormatting
                    Place(
                        placeId = it.placeId, mainText = formatting.mainText
                            ?: "", secondaryText = formatting.secondaryText
                            ?: ""
                    )
                }

                val autocompleteResponse = AutocompleteResponse(places)
                call.respond(autocompleteResponse)
            } catch (e: Exception) {
                call.respond(HttpStatusCode.InternalServerError, e)
            }
        }
    }
}
Stack trace
com.google.maps.errors.UnknownErrorException: Unexpected exception from com.google.apphosting.api.ApiProxy$CallNotFoundException: Can't make API call urlfetch.Fetch in a thread that is neither the original request thread nor a thread created by ThreadManager
	at com.google.maps.internal.GaePendingResult.await(GaePendingResult.java:121)
	at com.google.maps.PendingResultBase.await(PendingResultBase.java:58)
	at appengine.PlacesAutocompleteKt$placesAutocomplete$1$1$placeAutocompleteResponse$1.invokeSuspend(PlacesAutocomplete.kt:74)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:56)
	at kotlinx.coroutines.EventLoopImplBase.processNextEvent(EventLoop.common.kt:272)
	at kotlinx.coroutines.BlockingCoroutine.joinBlocking(Builders.kt:79)
	at kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking(Builders.kt:54)
	at kotlinx.coroutines.BuildersKt.runBlocking(Unknown Source)
	at kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking$default(Builders.kt:36)
	at kotlinx.coroutines.BuildersKt.runBlocking$default(Unknown Source)
	at appengine.PlacesAutocompleteKt$placesAutocomplete$1$1.invokeSuspend(PlacesAutocomplete.kt:74)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
	at kotlinx.coroutines.DispatchedTaskKt.resume(DispatchedTask.kt:175)
	at kotlinx.coroutines.DispatchedTaskKt.resumeUnconfined(DispatchedTask.kt:137)
	at kotlinx.coroutines.DispatchedTaskKt.dispatch(DispatchedTask.kt:108)
	at kotlinx.coroutines.CancellableContinuationImpl.dispatchResume(CancellableContinuationImpl.kt:307)
	at kotlinx.coroutines.CancellableContinuationImpl.resumeImpl(CancellableContinuationImpl.kt:317)
	at kotlinx.coroutines.CancellableContinuationImpl.resumeWith(CancellableContinuationImpl.kt:249)
	at retrofit2.KotlinExtensions$awaitResponse$2$2.onResponse(KotlinExtensions.kt:93)
	at retrofit2.OkHttpCall$1.onResponse(OkHttpCall.java:129)
	at okhttp3.RealCall$AsyncCall.execute(RealCall.java:174)
	at okhttp3.internal.NamedRunnable.run(NamedRunnable.java:32)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
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