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88d6acd Mar 8, 2015
@sirthias @jrudolph @jtescher @dpratt
122 lines (101 sloc) 4.35 KB
/*
* Copyright © 2011-2015 the spray project <http://spray.io>
*
* 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 spray.httpx.marshalling
import scala.concurrent.{ ExecutionContext, Future }
import scala.util.{ Failure, Success, Try }
import akka.actor.{ ActorRef, Actor, Props, ActorRefFactory }
import akka.io.Tcp
import spray.http._
trait MetaMarshallers extends LowerPriorityImplicitMetaMarshallers {
implicit def optionMarshaller[T](implicit m: Marshaller[T]) =
Marshaller[Option[T]] { (value, ctx)
value match {
case Some(v) m(v, ctx)
case None ctx.marshalTo(HttpEntity.Empty)
}
}
implicit def eitherMarshaller[A, B](implicit ma: Marshaller[A], mb: Marshaller[B]) =
Marshaller[Either[A, B]] { (value, ctx)
value match {
case Left(a) ma(a, ctx)
case Right(b) mb(b, ctx)
}
}
implicit def futureMarshaller[T](implicit m: Marshaller[T], ec: ExecutionContext) =
Marshaller[Future[T]] { (value, ctx)
value.onComplete {
case Success(v) m(v, ctx)
case Failure(error) ctx.handleError(error)
}
}
implicit def tryMarshaller[T](implicit m: Marshaller[T]) =
Marshaller[Try[T]] { (value, ctx)
value match {
case Success(v) m(v, ctx)
case Failure(t) ctx.handleError(t)
}
}
implicit def streamMarshaller[T](implicit marshaller: Marshaller[T], refFactory: ActorRefFactory) =
Marshaller[Stream[T]] { (value, ctx)
if (value.isEmpty) ctx.marshalTo(HttpEntity.Empty)
else refFactory.actorOf(Props(new MetaMarshallers.ChunkingActor(marshaller, ctx))) ! value
}
}
object MetaMarshallers extends MetaMarshallers {
private case class SentOk(remaining: Stream[_])
class ChunkingActor[T](marshaller: Marshaller[T], ctx: MarshallingContext) extends Actor {
var connectionActor: ActorRef = _
def receive = {
case current #:: rest
val chunkingCtx = new DelegatingMarshallingContext(ctx) {
override def marshalTo(entity: HttpEntity, headers: HttpHeader*): Unit =
if (connectionActor == null) connectionActor = ctx.startChunkedMessage(entity, Some(SentOk(rest)), headers)
else connectionActor ! MessageChunk(entity.data).withAck(SentOk(rest))
override def handleError(error: Throwable): Unit = {
context.stop(self)
ctx.handleError(error)
}
override def startChunkedMessage(entity: HttpEntity, sentAck: Option[Any], headers: Seq[HttpHeader])(implicit sender: ActorRef) =
sys.error("Cannot marshal a stream of streams")
}
marshaller(current.asInstanceOf[T], chunkingCtx)
case SentOk(remaining)
if (remaining.isEmpty) {
connectionActor ! ChunkedMessageEnd
context.stop(self)
} else self ! remaining
case _: Tcp.ConnectionClosed
context.stop(self)
}
}
}
trait LowerPriorityImplicitMetaMarshallers {
implicit def mMarshaller[M[_], T](implicit mm: MarshallerM[M], mt: Marshaller[T]): Marshaller[M[T]] =
mm.marshaller
}
trait MarshallerM[M[_]] {
def marshaller[T: Marshaller]: Marshaller[M[T]]
}
object MarshallerM {
implicit val optionMarshallerM: MarshallerM[Option] =
new MarshallerM[Option] { def marshaller[T: Marshaller] = implicitly[Marshaller[Option[T]]] }
implicit def futureMarshallerM(implicit ec: ExecutionContext): MarshallerM[Future] =
new MarshallerM[Future] { def marshaller[T: Marshaller] = implicitly[Marshaller[Future[T]]] }
implicit val tryMarshallerM: MarshallerM[Try] =
new MarshallerM[Try] { def marshaller[T: Marshaller] = implicitly[Marshaller[Try[T]]] }
implicit def streamMarshallerM(implicit refFactory: ActorRefFactory): MarshallerM[Stream] =
new MarshallerM[Stream] { def marshaller[T: Marshaller] = implicitly[Marshaller[Stream[T]]] }
}
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