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package com.softwaremill.sttp.asynchttpclient.fs2
import java.nio.ByteBuffer
import cats.effect._
import com.softwaremill.sttp.asynchttpclient.AsyncHttpClientBackend
import com.softwaremill.sttp.{FollowRedirectsBackend, MonadAsyncError, SttpBackend, SttpBackendOptions, Utf8, concatByteBuffers}
import fs2._
import fs2.interop.reactivestreams._
import org.asynchttpclient.{AsyncHttpClient, AsyncHttpClientConfig, DefaultAsyncHttpClient}
import org.reactivestreams.Publisher
import scala.concurrent.ExecutionContext
import scala.language.higherKinds
class AsyncHttpClientFs2Backend[F[_]: Effect] private (
asyncHttpClient: AsyncHttpClient,
closeClient: Boolean)(implicit ec: ExecutionContext)
extends AsyncHttpClientBackend[F, Stream[F, ByteBuffer]](
asyncHttpClient,
new EffectMonad,
closeClient
) {
override protected def streamBodyToPublisher(
s: Stream[F, ByteBuffer]): Publisher[ByteBuffer] =
s.toUnicastPublisher
override protected def publisherToStreamBody(
p: Publisher[ByteBuffer]): Stream[F, ByteBuffer] =
p.toStream[F]
override protected def publisherToString(
p: Publisher[ByteBuffer]): F[String] = {
val bytes = p
.toStream[F]
.compile
.fold(ByteBuffer.allocate(0))(concatByteBuffers)
implicitly[Effect[F]].map(bytes)(bb => new String(bb.array(), Utf8))
}
}
object AsyncHttpClientFs2Backend {
private def apply[F[_]: Effect](asyncHttpClient: AsyncHttpClient,
closeClient: Boolean)(
implicit ec: ExecutionContext): SttpBackend[F, Stream[F, ByteBuffer]] =
new FollowRedirectsBackend(
new AsyncHttpClientFs2Backend(asyncHttpClient, closeClient))
/**
* @param ec The execution context for running non-network related operations,
* e.g. mapping responses. Defaults to the global execution
* context.
*/
def apply[F[_]: Effect](options: SttpBackendOptions =
SttpBackendOptions.Default)(
implicit ec: ExecutionContext = ExecutionContext.Implicits.global)
: SttpBackend[F, Stream[F, ByteBuffer]] =
AsyncHttpClientFs2Backend[F](AsyncHttpClientBackend.defaultClient(options),
closeClient = true)
/**
* @param ec The execution context for running non-network related operations,
* e.g. mapping responses. Defaults to the global execution
* context.
*/
def usingConfig[F[_]: Effect](cfg: AsyncHttpClientConfig)(
implicit ec: ExecutionContext = ExecutionContext.Implicits.global)
: SttpBackend[F, Stream[F, ByteBuffer]] =
AsyncHttpClientFs2Backend[F](new DefaultAsyncHttpClient(cfg),
closeClient = true)
/**
* @param ec The execution context for running non-network related operations,
* e.g. mapping responses. Defaults to the global execution
* context.
*/
def usingClient[F[_]: Effect](client: AsyncHttpClient)(
implicit ec: ExecutionContext = ExecutionContext.Implicits.global)
: SttpBackend[F, Stream[F, ByteBuffer]] =
AsyncHttpClientFs2Backend[F](client, closeClient = false)
}
private[fs2] class EffectMonad[F[_]](implicit F: Effect[F])
extends MonadAsyncError[F] {
override def async[T](
register: ((Either[Throwable, T]) => Unit) => Unit): F[T] =
F.async(register)
override def unit[T](t: T): F[T] = F.pure(t)
override def map[T, T2](fa: F[T])(f: (T) => T2): F[T2] = F.map(fa)(f)
override def flatMap[T, T2](fa: F[T])(f: (T) => F[T2]): F[T2] =
F.flatMap(fa)(f)
override def error[T](t: Throwable): F[T] = F.raiseError(t)
override protected def handleWrappedError[T](rt: F[T])(
h: PartialFunction[Throwable, F[T]]): F[T] =
F.recoverWith(rt)(h)
}
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