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DnsActor.scala
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DnsActor.scala
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/*
* Copyright 2015-2019 Michael Krolikowski
*
* 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 com.github.mkroli.dns4s.akka
import java.net.InetSocketAddress
import java.util.concurrent.TimeUnit
import akka.actor._
import akka.io.Udp.CommandFailed
import akka.io.{IO, Udp}
import akka.pattern.ask
import akka.util.{ByteString, Timeout}
import com.github.mkroli.dns4s.dsl.{Query, Response}
import com.github.mkroli.dns4s.{Message, MessageBuffer}
import com.google.common.cache.CacheBuilder
import scala.collection.JavaConverters._
import scala.language.{implicitConversions, postfixOps}
import scala.util.Try
class DnsActor(port: Int, requester: ActorRef, handler: ActorRef)(implicit timeout: Timeout) extends Actor {
import context.{dispatcher, system}
var nextFreeId = 0
val requests = CacheBuilder
.newBuilder()
.expireAfterWrite(5, TimeUnit.SECONDS)
.build[Integer, ActorRef]()
.asMap()
.asScala
override def preStart(): Unit = {
IO(Udp) ! Udp.Bind(self, new InetSocketAddress(port))
}
private object MessageInByteString {
def unapply(bs: ByteString): Option[Message] =
Try(Message(MessageBuffer(bs.asByteBuffer))).toOption
}
override def receive = {
case Udp.Bound(_) =>
requester ! Dns.Bound
context become bound(sender())
case CommandFailed(Udp.Bind(_, _, _)) =>
requester ! Dns.Unbound
context stop self
}
def bound(socket: ActorRef): Receive = {
case Dns.DnsPacket(Query(message), destination) =>
nextFreeId = (nextFreeId + 1) % 0x10000
requests.put(nextFreeId, sender())
socket ! Udp.Send(ByteString(message.copy(header = message.header.copy(id = nextFreeId))().flipped().buf), destination)
case Udp.Received(MessageInByteString(Query(message)), remote) =>
(handler ? message).foreach {
case Response(response) =>
socket ! Udp.Send(ByteString(response.copy(header = response.header.copy(id = message.header.id))().flipped().buf), remote)
}
case Udp.Received(MessageInByteString(Response(message)), remote) =>
requests.get(message.header.id).foreach { sender =>
sender ! message
}
case Dns.Unbind =>
val s = sender()
socket ! Udp.Unbind
context become {
case Udp.Unbound =>
s ! Dns.Unbound
context stop self
}
}
}