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sttp.client3.HttpClientAsyncBackend.scala Maven / Gradle / Ivy
package sttp.client3
import sttp.client3.HttpClientBackend.EncodingHandler
import sttp.client3.internal.SttpToJavaConverters.{toJavaBiConsumer, toJavaFunction}
import sttp.client3.internal.httpclient.{AddToQueueListener, DelegatingWebSocketListener, Sequencer, WebSocketImpl}
import sttp.client3.internal.ws.{SimpleQueue, WebSocketEvent}
import sttp.model.{HeaderNames, StatusCode}
import sttp.monad.syntax._
import sttp.monad.{Canceler, MonadAsyncError, MonadError}
import java.net.http._
import java.time.Duration
import java.util.concurrent.CompletionException
import java.util.concurrent.atomic.AtomicBoolean
/** @tparam F
* The effect type
* @tparam S
* Type of supported byte streams, `Nothing` if none
* @tparam P
* Capabilities supported by the backend. See [[SttpBackend]].
* @tparam BH
* The low-level type of the body, read using a [[HttpResponse.BodyHandler]] read by [[HttpClient]].
* @tparam B
* The higher-level body to which `BH` is transformed (e.g. a backend-native stream representation), which then is
* used to read the body as described by `responseAs`.
*/
abstract class HttpClientAsyncBackend[F[_], S, P, BH, B](
client: HttpClient,
private implicit val monad: MonadAsyncError[F],
closeClient: Boolean,
customizeRequest: HttpRequest => HttpRequest,
customEncodingHandler: EncodingHandler[B]
) extends HttpClientBackend[F, S, P, B](client, closeClient, customEncodingHandler) {
override def send[T, R >: PE](request: Request[T, R]): F[Response[T]] =
adjustExceptions(request) {
if (request.isWebSocket) sendWebSocket(request) else sendRegular(request)
}
protected def createBodyHandler: HttpResponse.BodyHandler[BH]
protected def createSimpleQueue[T]: F[SimpleQueue[F, T]]
protected def createSequencer: F[Sequencer[F]]
protected def bodyHandlerBodyToBody(p: BH): B
protected def emptyBody(): B
private def sendRegular[T, R >: PE](request: Request[T, R]): F[Response[T]] = {
monad.flatMap(convertRequest(request)) { convertedRequest =>
val jRequest = customizeRequest(convertedRequest)
monad.flatten(monad.async[F[Response[T]]] { cb =>
def success(r: F[Response[T]]): Unit = cb(Right(r))
def error(t: Throwable): Unit = cb(Left(t))
var cf = client.sendAsync(jRequest, createBodyHandler)
val consumer = toJavaBiConsumer((t: HttpResponse[BH], u: Throwable) => {
if (t != null) {
// sometimes body returned by HttpClient can be null, we handle this by returning empty body to prevent NPE
val body = Option(t.body())
.map(bodyHandlerBodyToBody)
.getOrElse(emptyBody())
try success(readResponse(t, Left(body), request))
catch {
case e: Exception => error(e)
}
}
if (u != null) {
error(u)
}
})
cf = client.executor().orElse(null) match {
case null => cf.whenComplete(consumer)
case e => cf.whenCompleteAsync(consumer, e) // using the provided executor to further process the body
}
Canceler(() => cf.cancel(true))
})
}
}
private def sendWebSocket[T, R >: PE](request: Request[T, R]): F[Response[T]] = {
(for {
queue <- createSimpleQueue[WebSocketEvent]
sequencer <- createSequencer
ws <- sendWebSocket(request, queue, sequencer)
} yield ws).handleError {
case e: CompletionException if e.getCause.isInstanceOf[WebSocketHandshakeException] =>
readResponse(
e.getCause.asInstanceOf[WebSocketHandshakeException].getResponse,
Left(emptyBody()),
request
)
}
}
private def sendWebSocket[T, R >: PE](
request: Request[T, R],
queue: SimpleQueue[F, WebSocketEvent],
sequencer: Sequencer[F]
): F[Response[T]] = {
val isOpen: AtomicBoolean = new AtomicBoolean(false)
monad.flatten(monad.async[F[Response[T]]] { cb =>
def success(r: F[Response[T]]): Unit = cb(Right(r))
def error(t: Throwable): Unit = cb(Left(t))
val listener = new DelegatingWebSocketListener(
new AddToQueueListener(queue, isOpen),
ws => {
val webSocket = new WebSocketImpl[F](ws, queue, isOpen, monad, sequencer)
val baseResponse = Response((), StatusCode.SwitchingProtocols, "", Nil, Nil, request.onlyMetadata)
val body = bodyFromHttpClient(
Right(webSocket),
request.response,
baseResponse
)
success(body.map(b => baseResponse.copy(body = b)))
},
error
)
val wsSubProtocols = request.headers
.find(_.is(HeaderNames.SecWebSocketProtocol))
.map(_.value)
.toSeq
.flatMap(_.split(","))
.map(_.trim)
.toList
val wsBuilder = wsSubProtocols match {
case Nil => client.newWebSocketBuilder()
case head :: Nil => client.newWebSocketBuilder().subprotocols(head)
case head :: tail => client.newWebSocketBuilder().subprotocols(head, tail: _*)
}
client
.connectTimeout()
.map[java.net.http.WebSocket.Builder](toJavaFunction((d: Duration) => wsBuilder.connectTimeout(d)))
filterIllegalWsHeaders(request).headers.foreach(h => wsBuilder.header(h.name, h.value))
val cf = wsBuilder
.buildAsync(request.uri.toJavaUri, listener)
.thenApply[Unit](toJavaFunction((_: WebSocket) => ()))
.exceptionally(toJavaFunction((t: Throwable) => cb(Left(t))))
Canceler(() => cf.cancel(true))
})
}
private def filterIllegalWsHeaders[T, R](request: Request[T, R]): RequestT[Identity, T, R] = {
request.copy(headers = request.headers.filter(h => !wsIllegalHeaders.contains(h.name.toLowerCase)))
}
private def adjustExceptions[T](request: Request[_, _])(t: => F[T]): F[T] =
SttpClientException.adjustExceptions(responseMonad)(t)(
SttpClientException.defaultExceptionToSttpClientException(request, _)
)
override def responseMonad: MonadError[F] = monad
// these headers can't be sent using HttpClient; the SecWebSocketProtocol is supported through a builder method,
// the resit is ignored
private val wsIllegalHeaders: Set[String] = {
import HeaderNames._
Set(SecWebSocketAccept, SecWebSocketExtensions, SecWebSocketKey, SecWebSocketVersion, SecWebSocketProtocol).map(
_.toLowerCase
)
}
}
