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package com.softwaremill.sttp.asynchttpclient.monix
import java.nio.ByteBuffer
import com.softwaremill.sttp.{
FollowRedirectsBackend,
MonadAsyncError,
SttpBackend,
SttpBackendOptions,
Utf8,
concatByteBuffers
}
import com.softwaremill.sttp.asynchttpclient.AsyncHttpClientBackend
import monix.eval.Task
import monix.execution.{Cancelable, Scheduler}
import monix.reactive.Observable
import org.asynchttpclient.{
AsyncHttpClient,
AsyncHttpClientConfig,
DefaultAsyncHttpClient
}
import org.reactivestreams.Publisher
import scala.util.{Failure, Success}
class AsyncHttpClientMonixBackend private (
asyncHttpClient: AsyncHttpClient,
closeClient: Boolean)(implicit scheduler: Scheduler)
extends AsyncHttpClientBackend[Task, Observable[ByteBuffer]](
asyncHttpClient,
TaskMonad,
closeClient) {
override protected def streamBodyToPublisher(
s: Observable[ByteBuffer]): Publisher[ByteBuffer] =
s.toReactivePublisher
override protected def publisherToStreamBody(
p: Publisher[ByteBuffer]): Observable[ByteBuffer] =
Observable.fromReactivePublisher(p)
override protected def publisherToString(
p: Publisher[ByteBuffer]): Task[String] = {
val bytes = Observable
.fromReactivePublisher(p)
.foldLeftL(ByteBuffer.allocate(0))(concatByteBuffers)
bytes.map(bb => new String(bb.array(), Utf8))
}
}
object AsyncHttpClientMonixBackend {
private def apply(asyncHttpClient: AsyncHttpClient, closeClient: Boolean)(
implicit scheduler: Scheduler)
: SttpBackend[Task, Observable[ByteBuffer]] =
new FollowRedirectsBackend(
new AsyncHttpClientMonixBackend(asyncHttpClient, closeClient))
/**
* @param s The scheduler used for streaming request bodies. Defaults to the
* global scheduler.
*/
def apply(options: SttpBackendOptions = SttpBackendOptions.Default)(
implicit s: Scheduler = Scheduler.Implicits.global)
: SttpBackend[Task, Observable[ByteBuffer]] =
AsyncHttpClientMonixBackend(AsyncHttpClientBackend.defaultClient(options),
closeClient = true)
/**
* @param s The scheduler used for streaming request bodies. Defaults to the
* global scheduler.
*/
def usingConfig(cfg: AsyncHttpClientConfig)(implicit s: Scheduler =
Scheduler.Implicits.global)
: SttpBackend[Task, Observable[ByteBuffer]] =
AsyncHttpClientMonixBackend(new DefaultAsyncHttpClient(cfg),
closeClient = true)
/**
* @param s The scheduler used for streaming request bodies. Defaults to the
* global scheduler.
*/
def usingClient(client: AsyncHttpClient)(implicit s: Scheduler =
Scheduler.Implicits.global)
: SttpBackend[Task, Observable[ByteBuffer]] =
AsyncHttpClientMonixBackend(client, closeClient = false)
}
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(h)
}
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