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package com.softwaremill.sttp.okhttp.monix
import java.nio.ByteBuffer
import java.util.concurrent.ArrayBlockingQueue
import com.softwaremill.sttp.{SttpBackend, _}
import com.softwaremill.sttp.okhttp.{OkHttpAsyncBackend, OkHttpBackend}
import monix.eval.Task
import monix.execution.Ack.Continue
import monix.execution.{Ack, Cancelable, Scheduler}
import monix.reactive.Observable
import monix.reactive.observers.Subscriber
import okhttp3.{MediaType, OkHttpClient, RequestBody => OkHttpRequestBody}
import okio.BufferedSink
import scala.concurrent.Future
import scala.util.{Failure, Success, Try}
class OkHttpMonixBackend private (client: OkHttpClient, closeClient: Boolean)(
implicit s: Scheduler)
extends OkHttpAsyncBackend[Task, Observable[ByteBuffer]](client,
TaskMonad,
closeClient) {
override def streamToRequestBody(
stream: Observable[ByteBuffer]): Option[OkHttpRequestBody] =
Some(new OkHttpRequestBody() {
override def writeTo(sink: BufferedSink): Unit =
toIterable(stream) map (_.array()) foreach sink.write
override def contentType(): MediaType = null
})
override def responseBodyToStream(
res: okhttp3.Response): Try[Observable[ByteBuffer]] =
Success(
Observable
.fromInputStream(res.body().byteStream())
.map(ByteBuffer.wrap)
.doAfterTerminate(_ => res.close()))
private def toIterable[T](observable: Observable[T])(
implicit s: Scheduler): Iterable[T] =
new Iterable[T] {
override def iterator: Iterator[T] = new Iterator[T] {
case object Completed extends Exception
val blockingQueue = new ArrayBlockingQueue[Either[Throwable, T]](1)
observable.executeWithFork.subscribe(new Subscriber[T] {
override implicit def scheduler: Scheduler = s
override def onError(ex: Throwable): Unit = {
blockingQueue.put(Left(ex))
}
override def onComplete(): Unit = {
blockingQueue.put(Left(Completed))
}
override def onNext(elem: T): Future[Ack] = {
blockingQueue.put(Right(elem))
Continue
}
})
var value: T = _
override def hasNext: Boolean =
blockingQueue.take() match {
case Left(Completed) => false
case Right(elem) =>
value = elem
true
case Left(ex) => throw ex
}
override def next(): T = value
}
}
}
object OkHttpMonixBackend {
private def apply(client: OkHttpClient, closeClient: Boolean)(
implicit s: Scheduler): SttpBackend[Task, Observable[ByteBuffer]] =
new FollowRedirectsBackend(new OkHttpMonixBackend(client, closeClient)(s))
def apply(options: SttpBackendOptions = SttpBackendOptions.Default)(
implicit s: Scheduler = Scheduler.Implicits.global)
: SttpBackend[Task, Observable[ByteBuffer]] =
OkHttpMonixBackend(
OkHttpBackend.defaultClient(DefaultReadTimeout.toMillis, options),
closeClient = true)(s)
def usingClient(client: OkHttpClient)(implicit s: Scheduler =
Scheduler.Implicits.global)
: SttpBackend[Task, Observable[ByteBuffer]] =
OkHttpMonixBackend(client, closeClient = false)(s)
}
private[monix] object TaskMonad extends MonadAsyncError[Task] {
override def unit[T](t: T): Task[T] = Task.now(t)
override def map[T, T2](fa: Task[T])(f: (T) => T2): Task[T2] = fa.map(f)
override def flatMap[T, T2](fa: Task[T])(f: (T) => Task[T2]): Task[T2] =
fa.flatMap(f)
override def async[T](
register: ((Either[Throwable, T]) => Unit) => Unit): Task[T] =
Task.async { (_, cb) =>
register {
case Left(t) => cb(Failure(t))
case Right(t) => cb(Success(t))
}
Cancelable.empty
}
override def error[T](t: Throwable): Task[T] = Task.raiseError(t)
override protected def handleWrappedError[T](rt: Task[T])(
h: PartialFunction[Throwable, Task[T]]): Task[T] = rt.onErrorRecoverWith {
case t => h(t)
}
}
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