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/*
* Copyright 2014 http4s.org
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.http4s
package client
import cats.data._
import cats.effect.Ref
import cats.effect._
import cats.effect.kernel.CancelScope
import cats.effect.kernel.Poll
import cats.syntax.all._
import cats.~>
import fs2._
import org.http4s.headers.Host
import java.io.IOException
import scala.util.control.NoStackTrace
/** A [[Client]] submits [[Request]]s to a server and processes the [[Response]].
*
* When a connection is "released" and the HTTP semantics of the
* request and response permit, the connection may be kept alive by
* the backend and used for a subsequent request. When HTTP
* semantics require it, or at the backend's discretion, a released
* connection may also be closed.
*/
trait Client[F[_]] {
def run(req: Request[F]): Resource[F, Response[F]]
/** Submits a request, and provides a callback to process the response.
*
* @param req The request to submit
* @param f A callback for the response to req. The underlying HTTP connection
* is released when the returned task completes. Attempts to read the
* response body afterward will result in an error.
* @return The result of applying f to the response to req
*/
@deprecated("Use run(req).use(f)", "0.21.5")
def fetch[A](req: Request[F])(f: Response[F] => F[A]): F[A]
/** Submits a request, and provides a callback to process the response.
*
* @param req An effect of the request to submit
* @param f A callback for the response to req. The underlying HTTP connection
* is released when the returned task completes. Attempts to read the
* response body afterward will result in an error.
* @return The result of applying f to the response to req
*/
@deprecated("Use req.flatMap(run(_).use(f))", "0.21.5")
def fetch[A](req: F[Request[F]])(f: Response[F] => F[A]): F[A]
/** Returns this client as a [[cats.data.Kleisli]]. All connections created
* by this service are released on completion of callback task f.
*
* This method effectively reverses the arguments to `run` followed by `use`, and is
* preferred when an HTTP client is composed into a larger Kleisli function,
* or when a common response callback is used by many call sites.
*/
def toKleisli[A](f: Response[F] => F[A]): Kleisli[F, Request[F], A]
/** Returns this client as an [[HttpApp]]. It is the responsibility
* of callers of this service to run the response body to release
* the underlying HTTP connection.
*
* This is intended for use in proxy servers. [[run]], [[fetchAs[A](req:org\.http4s\.Request[F])*]],
* [[toKleisli]], and [[stream]] are safer alternatives, as their
* signatures guarantee release of the HTTP connection.
*/
def toHttpApp: HttpApp[F]
/** Run the request as a stream. The response lifecycle is equivalent
* to the returned Stream's.
*/
def stream(req: Request[F]): Stream[F, Response[F]]
def expectOr[A](req: Request[F])(onError: Response[F] => F[Throwable])(implicit
d: EntityDecoder[F, A]
): F[A]
/** Submits a request and decodes the response on success. On failure, the
* status code is returned. The underlying HTTP connection is released at the
* completion of the decoding.
*/
def expect[A](req: Request[F])(implicit d: EntityDecoder[F, A]): F[A]
def expectOr[A](req: F[Request[F]])(onError: Response[F] => F[Throwable])(implicit
d: EntityDecoder[F, A]
): F[A]
@deprecated("Use req.flatMap(expect(_))", "0.23.16")
def expect[A](req: F[Request[F]])(implicit d: EntityDecoder[F, A]): F[A]
def expectOr[A](uri: Uri)(onError: Response[F] => F[Throwable])(implicit
d: EntityDecoder[F, A]
): F[A]
/** Submits a GET request to the specified URI and decodes the response on
* success. On failure, the status code is returned. The underlying HTTP
* connection is released at the completion of the decoding.
*/
def expect[A](uri: Uri)(implicit d: EntityDecoder[F, A]): F[A]
def expectOr[A](s: String)(onError: Response[F] => F[Throwable])(implicit
d: EntityDecoder[F, A]
): F[A]
/** Submits a GET request to the URI specified by the String and decodes the
* response on success. On failure, the status code is returned. The
* underlying HTTP connection is released at the completion of the decoding.
*/
def expect[A](s: String)(implicit d: EntityDecoder[F, A]): F[A]
def expectOptionOr[A](req: Request[F])(onError: Response[F] => F[Throwable])(implicit
d: EntityDecoder[F, A]
): F[Option[A]]
def expectOption[A](req: Request[F])(implicit d: EntityDecoder[F, A]): F[Option[A]]
/** Submits a request and decodes the response, regardless of the status code.
* The underlying HTTP connection is released at the completion of the
* decoding.
*/
def fetchAs[A](req: Request[F])(implicit d: EntityDecoder[F, A]): F[A]
/** Submits a request and decodes the response, regardless of the status code.
* The underlying HTTP connection is released at the completion of the
* decoding.
*/
@deprecated("Use req.flatMap(fetchAs(_))", "0.23.16")
def fetchAs[A](req: F[Request[F]])(implicit d: EntityDecoder[F, A]): F[A]
/** Submits a request and returns the response status */
def status(req: Request[F]): F[Status]
/** Submits a request and returns the response status */
@deprecated("Use req.flatMap(status(_))", "0.23.16")
def status(req: F[Request[F]]): F[Status]
/** Submits a GET request to the URI and returns the response status */
def statusFromUri(uri: Uri): F[Status]
/** Submits a GET request to the URI and returns the response status */
def statusFromString(s: String): F[Status]
/** Submits a request and returns true if and only if the response status is
* successful
*/
def successful(req: Request[F]): F[Boolean]
/** Submits a request and returns true if and only if the response status is
* successful
*/
@deprecated("Use req.flatMap(successful(_))", "0.23.16")
def successful(req: F[Request[F]]): F[Boolean]
/** Submits a GET request, and provides a callback to process the response.
*
* @param uri The URI to GET
* @param f A callback for the response to a GET on uri. The underlying HTTP connection
* is released when the returned task completes. Attempts to read the
* response body afterward will result in an error.
* @return The result of applying f to the response to req
*/
def get[A](uri: Uri)(f: Response[F] => F[A]): F[A]
/** Submits a request and decodes the response on success. On failure, the
* status code is returned. The underlying HTTP connection is released at the
* completion of the decoding.
*/
def get[A](s: String)(f: Response[F] => F[A]): F[A]
/** As [[#expectOptionOr]], but defined in terms of [[cats.data.OptionT]]. */
final def expectOptionOrT[A](req: Request[F])(onError: Response[F] => F[Throwable])(implicit
d: EntityDecoder[F, A]
): OptionT[F, A] =
OptionT(expectOptionOr(req)(onError)(d))
/** As [[#expectOption]], but defined in terms of [[cats.data.OptionT]]. */
final def expectOptionT[A](req: Request[F])(implicit d: EntityDecoder[F, A]): OptionT[F, A] =
OptionT(expectOption[A](req)(d))
@deprecated("use public method with MonadCancelThrow instead", since = "0.23.7")
private[client] def translate[G[_]: Async](
fk: F ~> G
)(gK: G ~> F)(implicit F: MonadCancelThrow[F]): Client[G] = translateImpl(fk)(gK)
/** Translates the effect type of this client from F to G
*/
@deprecated("use public method without MonadCancelThrow[G] constraint instead", since = "0.23.12")
private[client] def translate[G[_]: MonadCancelThrow](
fk: F ~> G
)(gK: G ~> F)(implicit F: MonadCancelThrow[F]): Client[G] = translateImpl(fk)(gK)
/** Translates the effect type of this client from F to G
*/
def translate[G[_]](
fk: F ~> G
)(gK: G ~> F)(implicit F: MonadCancelThrow[F]): Client[G] = translateImpl(fk)(gK)
private[client] def translateImpl[G[_]](
fk: F ~> G
)(gK: G ~> F)(implicit F: MonadCancelThrow[F]): Client[G] = {
implicit val G: MonadCancelThrow[G] = liftMonadCancel(F)(fk)(gK)
Client[G]((req: Request[G]) =>
run(
req.mapK(gK)
).mapK(fk)
.map(_.mapK(fk))
)
}
private[this] def liftMonadCancel[G[_]](
F: MonadCancelThrow[F]
)(fk: F ~> G)(gk: G ~> F): MonadCancelThrow[G] =
new MonadCancelThrow[G] {
def pure[A](x: A): G[A] = fk(F.pure(x))
// Members declared in cats.ApplicativeError
def handleErrorWith[A](ga: G[A])(f: Throwable => G[A]): G[A] =
fk(F.handleErrorWith(gk(ga))(ex => gk(f(ex))))
def raiseError[A](e: Throwable): G[A] = fk(F.raiseError[A](e))
// Members declared in cats.FlatMap
def flatMap[A, B](ga: G[A])(f: A => G[B]): G[B] =
fk(F.flatMap(gk(ga))(a => gk(f(a))))
def tailRecM[A, B](a: A)(f: A => G[Either[A, B]]): G[B] =
fk(F.tailRecM(a)(a => gk(f(a))))
// Members declared in cats.effect.kernel.MonadCancel
def canceled: G[Unit] = fk(F.canceled)
def forceR[A, B](ga: G[A])(gb: G[B]): G[B] =
fk(F.forceR(gk(ga))(gk(gb)))
def onCancel[A](ga: G[A], fin: G[Unit]): G[A] =
fk(F.onCancel(gk(ga), gk(fin)))
def rootCancelScope: CancelScope = F.rootCancelScope
def uncancelable[A](body: Poll[G] => G[A]): G[A] =
fk(F.uncancelable { pollF =>
gk(body(new Poll[G] {
def apply[B](gb: G[B]): G[B] = fk(pollF(gk(gb)))
}))
})
}
}
object Client {
def apply[F[_]](
f: Request[F] => Resource[F, Response[F]]
)(implicit F: MonadCancelThrow[F]): Client[F] =
new DefaultClient[F] {
def run(req: Request[F]): Resource[F, Response[F]] = f(req)
}
/** Creates a client from the specified [[HttpApp]]. Useful for
* generating pre-determined responses for requests in testing.
*
* @param app the [[HttpApp]] to respond to requests to this client
*/
def fromHttpApp[F[_]](app: HttpApp[F])(implicit F: Async[F]): Client[F] = {
def until[A](disposed: Ref[F, Boolean])(source: Stream[F, A]): Stream[F, A] = {
def go(stream: Stream[F, A]): Pull[F, A, Unit] =
stream.pull.uncons.flatMap {
case Some((chunk, stream)) =>
Pull.eval(disposed.get).flatMap {
case true => Pull.raiseError[F](new IOException("response was disposed"))
case false => Pull.output(chunk) >> go(stream)
}
case None => Pull.done
}
go(source).stream
}
def runOrDispose(req: Request[F]): F[Resource[F, Response[F]]] =
Ref[F].of(false).map { disposed =>
val req0 = addHostHeaderIfUriIsAbsolute(req.pipeBodyThrough(until(disposed)))
Resource
.eval(app(req0))
.onFinalize(disposed.set(true))
.map(_.pipeBodyThrough(until(disposed)))
}
Client((req: Request[F]) => Resource.suspend(runOrDispose(req)))
}
/** This method introduces an important way for the effectful backends to allow tracing. As Kleisli types
* form the backend of tracing and these transformations are non-trivial.
*/
def liftKleisli[F[_]: MonadCancelThrow, A](client: Client[F]): Client[Kleisli[F, A, *]] =
Client { (req: Request[Kleisli[F, A, *]]) =>
Resource.eval(Kleisli.ask[F, A]).flatMap { a =>
client
.run(req.mapK(Kleisli.applyK(a)))
.mapK(Kleisli.liftK[F, A])
.map(_.mapK(Kleisli.liftK))
}
}
private def addHostHeaderIfUriIsAbsolute[F[_]](req: Request[F]): Request[F] =
req.uri.host match {
case Some(host) if !req.headers.contains[Host] =>
req.withHeaders(req.headers.put(Host(host.value, req.uri.port)))
case _ => req
}
}
final case class UnexpectedStatus(status: Status, requestMethod: Method, requestUri: Uri)
extends RuntimeException
with NoStackTrace {
override def getMessage: String =
s"unexpected HTTP status: $status for request $requestMethod $requestUri"
}
