io.gatling.http.resolver.SharedAsyncDnsNameResolverFactory.scala Maven / Gradle / Ivy
/*
* Copyright 2011-2021 GatlingCorp (https://gatling.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 io.gatling.http.resolver
import java.{ util => ju }
import java.net.{ InetAddress, InetSocketAddress }
import java.util.concurrent.ConcurrentHashMap
import io.gatling.http.client.HttpListener
import io.gatling.http.client.resolver.InetAddressNameResolver
import io.gatling.http.engine.HttpEngine
import akka.actor.ActorSystem
import io.netty.channel.EventLoop
import io.netty.resolver.dns.{ DefaultDnsCache, DnsCache }
import io.netty.util.concurrent.{ Future, Promise }
object SharedAsyncDnsNameResolverFactory {
def apply(httpEngine: HttpEngine, dnsServers: Array[InetSocketAddress], actorSystem: ActorSystem): EventLoop => InetAddressNameResolver = {
// create shared name resolvers for all the users with this protocol
val sharedResolverCache = new ConcurrentHashMap[EventLoop, InetAddressNameResolver]
// perform close on system shutdown instead of virtual user termination as it's shared
actorSystem.registerOnTermination(() => sharedResolverCache.values().forEach(_.close()))
val inProgressResolutions = new ConcurrentHashMap[String, Promise[ju.List[InetAddress]]]
val sharedCache: DnsCache = new DefaultDnsCache
val computer: ju.function.Function[EventLoop, InetAddressNameResolver] =
el => {
val actualResolver = httpEngine.newAsyncDnsNameResolver(el, dnsServers, sharedCache)
new InflightInetAddressNameResolver(actualResolver, inProgressResolutions)
}
eventLoop => sharedResolverCache.computeIfAbsent(eventLoop, computer)
}
}
class InflightInetAddressNameResolver(wrapped: InetAddressNameResolver, inProgressResolutions: ConcurrentHashMap[String, Promise[ju.List[InetAddress]]])
extends InetAddressNameResolver {
override def resolveAll(inetHost: String, promise: Promise[ju.List[InetAddress]], listener: HttpListener): Future[ju.List[InetAddress]] = {
val earlyPromise = inProgressResolutions.putIfAbsent(inetHost, promise)
if (earlyPromise != null) {
// name resolution for the specified inetHost is already in progress
if (earlyPromise.isDone) {
transferResult(earlyPromise, promise)
} else {
earlyPromise.addListener(transferResult(_, promise))
}
} else {
try {
wrapped.resolveAll(inetHost, promise, listener)
} finally {
if (promise.isDone) {
inProgressResolutions.remove(inetHost)
} else {
promise.addListener((_: Future[ju.List[InetAddress]]) => inProgressResolutions.remove(inetHost))
}
}
}
promise
}
private def transferResult(src: Future[ju.List[InetAddress]], dst: Promise[ju.List[InetAddress]]): Unit = {
if (src.isSuccess) {
dst.trySuccess(src.getNow)
} else {
dst.tryFailure(src.cause)
}
}
// noop as shared
override def close(): Unit = {}
}