sources/hv-collector-dcae-app-simulator/src/main/kotlin/org/onap/dcae/collectors/veshv/simulators/dcaeapp/impl/adapters/KafkaSource.kt

   1 /*
   2  * ============LICENSE_START=======================================================
   3  * dcaegen2-collectors-veshv
   4  * ================================================================================
   5  * Copyright (C) 2018 NOKIA
   6  * ================================================================================
   7  * Licensed under the Apache License, Version 2.0 (the "License");
   8  * you may not use this file except in compliance with the License.
   9  * You may obtain a copy of the License at
  10  *
  11  *      http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  * Unless required by applicable law or agreed to in writing, software
  14  * distributed under the License is distributed on an "AS IS" BASIS,
  15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  * See the License for the specific language governing permissions and
  17  * limitations under the License.
  18  * ============LICENSE_END=========================================================
  19  */
  20 package org.onap.dcae.collectors.veshv.simulators.dcaeapp.impl.adapters
  21
  22 import org.apache.kafka.clients.CommonClientConfigs
  23 import org.apache.kafka.clients.consumer.ConsumerConfig
  24 import org.apache.kafka.common.config.SaslConfigs
  25 import org.apache.kafka.common.security.auth.SecurityProtocol
  26 import org.apache.kafka.common.security.plain.internals.PlainSaslServer.PLAIN_MECHANISM
  27 import org.apache.kafka.common.serialization.ByteArrayDeserializer
  28 import org.onap.dcae.collectors.veshv.utils.logging.Logger
  29 import reactor.core.publisher.Flux
  30 import reactor.kafka.receiver.KafkaReceiver
  31 import reactor.kafka.receiver.ReceiverOptions
  32 import reactor.kafka.receiver.ReceiverRecord
  33
  34 /**
  35  * @author Piotr Jaszczyk <piotr.jaszczyk@nokia.com>
  36  * @since May 2018
  37  */
  38 internal class KafkaSource(private val receiver: KafkaReceiver<ByteArray, ByteArray>) {
  39
  40     fun start(): Flux<ReceiverRecord<ByteArray, ByteArray>> =
  41             receiver.receive()
  42                     .also { logger.info { "Started Kafka source" } }
  43
  44     companion object {
  45         private val logger = Logger(KafkaSource::class)
  46
  47         private const val LOGIN_MODULE_CLASS = "org.apache.kafka.common.security.plain.PlainLoginModule"
  48         private const val USERNAME = "admin"
  49         private const val PASSWORD = "admin_secret"
  50         private const val JAAS_CONFIG = "$LOGIN_MODULE_CLASS required username=$USERNAME password=$PASSWORD;"
  51         private val SASL_PLAINTEXT = (SecurityProtocol.SASL_PLAINTEXT as Enum<SecurityProtocol>).name
  52
  53         fun create(bootstrapServers: String, topics: Set<String>): KafkaSource {
  54             return KafkaSource(KafkaReceiver.create(createReceiverOptions(bootstrapServers, topics)))
  55         }
  56
  57
  58         fun createReceiverOptions(bootstrapServers: String,
  59                                   topics: Set<String>): ReceiverOptions<ByteArray, ByteArray>? {
  60             val props = mapOf<String, Any>(
  61                     ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG to bootstrapServers,
  62                     ConsumerConfig.CLIENT_ID_CONFIG to "hv-collector-dcae-app-simulator",
  63                     ConsumerConfig.GROUP_ID_CONFIG to "hv-collector-simulators",
  64                     ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG to ByteArrayDeserializer::class.java,
  65                     ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG to ByteArrayDeserializer::class.java,
  66                     ConsumerConfig.AUTO_OFFSET_RESET_CONFIG to "earliest",
  67
  68                     CommonClientConfigs.SECURITY_PROTOCOL_CONFIG to SASL_PLAINTEXT,
  69                     SaslConfigs.SASL_MECHANISM to PLAIN_MECHANISM,
  70                     SaslConfigs.SASL_JAAS_CONFIG to JAAS_CONFIG
  71             )
  72             return ReceiverOptions.create<ByteArray, ByteArray>(props)
  73                     .addAssignListener { partitions -> logger.debug { "Partitions assigned $partitions" } }
  74                     .addRevokeListener { partitions -> logger.debug { "Partitions revoked $partitions" } }
  75                     .subscription(topics)
  76         }
  77     }
  78 }