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ALPNServerSelector.scala
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ALPNServerSelector.scala
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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.blaze.http
package http2.server
import java.nio.ByteBuffer
import javax.net.ssl.SSLEngine
import java.util
import org.http4s.blaze.internal.compat.CollectionConverters._
import org.http4s.blaze.pipeline.{LeafBuilder, TailStage, Command => Cmd}
import org.http4s.blaze.util.Execution.trampoline
import scala.util.{Failure, Success}
import scala.util.control.NonFatal
/** Dynamically inject an appropriate pipeline using ALPN negotiation.
*
* @param engine the `SSLEngine` in use for the connection
* @param selector selects the preferred protocol from the sequence of
* supported clients. May receive an empty sequence.
* @param builder builds the appropriate pipeline based on the negotiated
* protocol
*/
final class ALPNServerSelector(
engine: SSLEngine,
selector: Set[String] => String,
builder: String => LeafBuilder[ByteBuffer]
) extends TailStage[ByteBuffer] {
engine.setHandshakeApplicationProtocolSelector(
new util.function.BiFunction[SSLEngine, util.List[String], String] {
def apply(engine: SSLEngine, protocols: util.List[String]): String = {
val available = protocols.asScala.toList
logger.debug("Available protocols: " + available)
selector(available.toSet)
}
})
override def name: String = "PipelineSelector"
override protected def stageStartup(): Unit =
// This shouldn't complete until the handshake is done and ALPN has been run.
channelWrite(Nil).onComplete {
case Success(_) => selectPipeline()
case Failure(Cmd.EOF) => // NOOP
case Failure(t) =>
logger.error(t)(s"$name failed to startup")
closePipeline(Some(t))
}(trampoline)
private def selectPipeline(): Unit =
try {
val protocol = Option(engine.getApplicationProtocol()).getOrElse(selector(Set.empty))
val b = builder(protocol)
this.replaceTail(b, true)
()
} catch {
case NonFatal(t) =>
logger.error(t)("Failure building pipeline")
closePipeline(Some(t))
}
}