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package com.softwaremill.sttp.asynchttpclient.cats
import java.nio.ByteBuffer
import cats.effect._
import com.softwaremill.sttp.asynchttpclient.AsyncHttpClientBackend
import com.softwaremill.sttp.{FollowRedirectsBackend, MonadAsyncError, SttpBackend, SttpBackendOptions}
import org.asynchttpclient.{AsyncHttpClient, AsyncHttpClientConfig, DefaultAsyncHttpClient}
import org.reactivestreams.Publisher
import scala.language.higherKinds
class AsyncHttpClientCatsBackend[F[_]: Async] private (
asyncHttpClient: AsyncHttpClient,
closeClient: Boolean
) extends AsyncHttpClientBackend[F, Nothing](
asyncHttpClient,
new AsyncMonad,
closeClient
) {
override protected def streamBodyToPublisher(s: Nothing): Publisher[ByteBuffer] = s // nothing is everything
override protected def publisherToStreamBody(p: Publisher[ByteBuffer]): Nothing =
throw new IllegalStateException("This backend does not support streaming")
override protected def publisherToString(p: Publisher[ByteBuffer]): F[String] =
throw new IllegalStateException("This backend does not support streaming")
}
object AsyncHttpClientCatsBackend {
private def apply[F[_]: Async](asyncHttpClient: AsyncHttpClient, closeClient: Boolean): SttpBackend[F, Nothing] =
new FollowRedirectsBackend[F, Nothing](new AsyncHttpClientCatsBackend(asyncHttpClient, closeClient))
def apply[F[_]: Async](options: SttpBackendOptions = SttpBackendOptions.Default): SttpBackend[F, Nothing] =
AsyncHttpClientCatsBackend(AsyncHttpClientBackend.defaultClient(options), closeClient = true)
def usingConfig[F[_]: Async](cfg: AsyncHttpClientConfig): SttpBackend[F, Nothing] =
AsyncHttpClientCatsBackend(new DefaultAsyncHttpClient(cfg), closeClient = true)
def usingClient[F[_]: Async](client: AsyncHttpClient): SttpBackend[F, Nothing] =
AsyncHttpClientCatsBackend(client, closeClient = false)
}
private[cats] class AsyncMonad[F[_]](implicit F: Async[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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