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Embedded Kafka support in OpenWhisk Standalone mode (apache#4628)
Enable support for Embedded Kafka to enable Kafka based feature development. It also support launching Kafdrop 3 based Ui for visualizing Kafka related metadata.
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core/standalone/src/main/scala/org/apache/openwhisk/standalone/KafkaLauncher.scala
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| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one or more | ||
| * contributor license agreements. See the NOTICE file distributed with | ||
| * this work for additional information regarding copyright ownership. | ||
| * The ASF licenses this file to You 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. | ||
| */ | ||
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| package org.apache.openwhisk.standalone | ||
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| import java.io.File | ||
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| import akka.actor.ActorSystem | ||
| import akka.stream.ActorMaterializer | ||
| import kafka.server.KafkaConfig | ||
| import net.manub.embeddedkafka.{EmbeddedKafka, EmbeddedKafkaConfig} | ||
| import org.apache.commons.io.FileUtils | ||
| import org.apache.openwhisk.common.{Logging, TransactionId} | ||
| import org.apache.openwhisk.core.WhiskConfig | ||
| import org.apache.openwhisk.core.WhiskConfig.kafkaHosts | ||
| import org.apache.openwhisk.core.entity.ControllerInstanceId | ||
| import org.apache.openwhisk.core.loadBalancer.{LeanBalancer, LoadBalancer, LoadBalancerProvider} | ||
| import org.apache.openwhisk.standalone.StandaloneDockerSupport.{checkOrAllocatePort, containerName, createRunCmd} | ||
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| import scala.concurrent.{ExecutionContext, Future} | ||
| import scala.reflect.io.Directory | ||
| import scala.util.Try | ||
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| class KafkaLauncher(docker: StandaloneDockerClient, | ||
| kafkaPort: Int, | ||
| kafkaDockerPort: Int, | ||
| zkPort: Int, | ||
| workDir: File, | ||
| kafkaUi: Boolean)(implicit logging: Logging, | ||
| ec: ExecutionContext, | ||
| actorSystem: ActorSystem, | ||
| materializer: ActorMaterializer, | ||
| tid: TransactionId) { | ||
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| def run(): Future[Seq[ServiceContainer]] = { | ||
| for { | ||
| kafkaSvcs <- runKafka() | ||
| uiSvcs <- if (kafkaUi) runKafkaUI() else Future.successful(Seq.empty[ServiceContainer]) | ||
| } yield kafkaSvcs ++ uiSvcs | ||
| } | ||
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| def runKafka(): Future[Seq[ServiceContainer]] = { | ||
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| //Below setting based on https://rmoff.net/2018/08/02/kafka-listeners-explained/ | ||
| // We configure two listeners where one is used for host based application and other is used for docker based application | ||
| // to connect to Kafka server running on host | ||
| // Here controller / invoker will use LISTENER_LOCAL since they run in the same JVM as the embedded Kafka | ||
| // and Kafka UI will run in a Docker container and use LISTENER_DOCKER | ||
| val brokerProps = Map( | ||
| KafkaConfig.ListenersProp -> s"LISTENER_LOCAL://localhost:$kafkaPort,LISTENER_DOCKER://localhost:$kafkaDockerPort", | ||
| KafkaConfig.AdvertisedListenersProp -> s"LISTENER_LOCAL://localhost:$kafkaPort,LISTENER_DOCKER://${StandaloneDockerSupport | ||
| .getLocalHostIp()}:$kafkaDockerPort", | ||
| KafkaConfig.ListenerSecurityProtocolMapProp -> "LISTENER_LOCAL:PLAINTEXT,LISTENER_DOCKER:PLAINTEXT", | ||
| KafkaConfig.InterBrokerListenerNameProp -> "LISTENER_LOCAL") | ||
| implicit val config: EmbeddedKafkaConfig = | ||
| EmbeddedKafkaConfig(kafkaPort = kafkaPort, zooKeeperPort = zkPort, customBrokerProperties = brokerProps) | ||
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| val t = Try { | ||
| EmbeddedKafka.startZooKeeper(createDir("zookeeper")) | ||
| EmbeddedKafka.startKafka(createDir("kafka")) | ||
| } | ||
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| Future | ||
| .fromTry(t) | ||
| .map( | ||
| _ => | ||
| Seq( | ||
| ServiceContainer(kafkaPort, s"localhost:$kafkaPort", "kafka"), | ||
| ServiceContainer( | ||
| kafkaDockerPort, | ||
| s"${StandaloneDockerSupport.getLocalHostIp()}:$kafkaDockerPort", | ||
| "kafka-docker"), | ||
| ServiceContainer(zkPort, "Zookeeper", "zookeeper"))) | ||
| } | ||
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| def runKafkaUI(): Future[Seq[ServiceContainer]] = { | ||
| val hostIp = StandaloneDockerSupport.getLocalHostIp() | ||
| val port = checkOrAllocatePort(9000) | ||
| val env = Map( | ||
| "ZOOKEEPER_CONNECT" -> s"$hostIp:$zkPort", | ||
| "KAFKA_BROKERCONNECT" -> s"$hostIp:$kafkaDockerPort", | ||
| "JVM_OPTS" -> "-Xms32M -Xmx64M", | ||
| "SERVER_SERVLET_CONTEXTPATH" -> "/") | ||
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| logging.info(this, s"Starting Kafka Drop UI port: $port") | ||
| val name = containerName("kafka-drop-ui") | ||
| val params = Map("-p" -> Set(s"$port:9000")) | ||
| val args = createRunCmd(name, env, params) | ||
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| val f = docker.runDetached("obsidiandynamics/kafdrop", args, true) | ||
| f.map(_ => Seq(ServiceContainer(port, s"http://localhost:$port", name))) | ||
| } | ||
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| private def createDir(name: String) = { | ||
| val dir = new File(workDir, name) | ||
| FileUtils.forceMkdir(dir) | ||
| Directory(dir) | ||
| } | ||
| } | ||
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| object KafkaAwareLeanBalancer extends LoadBalancerProvider { | ||
| override def requiredProperties: Map[String, String] = LeanBalancer.requiredProperties ++ kafkaHosts | ||
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| override def instance(whiskConfig: WhiskConfig, instance: ControllerInstanceId)( | ||
| implicit actorSystem: ActorSystem, | ||
| logging: Logging, | ||
| materializer: ActorMaterializer): LoadBalancer = LeanBalancer.instance(whiskConfig, instance) | ||
| } | ||
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| object KafkaLauncher { | ||
| val preferredKafkaPort = 9092 | ||
| val preferredKafkaDockerPort = preferredKafkaPort - 1 | ||
| val preferredZkPort = 2181 | ||
| } |
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