ms/blueprintsprocessor/modules/inbounds/selfservice-api/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/selfservice/api/BluePrintProcessingKafkaConsumer.kt

   1 /*
   2  *  Copyright © 2019 IBM.
   3  *
   4  *  Licensed under the Apache License, Version 2.0 (the "License");
   5  *  you may not use this file except in compliance with the License.
   6  *  You may obtain a copy of the License at
   7  *
   8  *      http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  *  Unless required by applicable law or agreed to in writing, software
  11  *  distributed under the License is distributed on an "AS IS" BASIS,
  12  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  *  See the License for the specific language governing permissions and
  14  *  limitations under the License.
  15  */
  16
  17 package org.onap.ccsdk.cds.blueprintsprocessor.selfservice.api
  18
  19 import kotlinx.coroutines.channels.consumeEach
  20 import kotlinx.coroutines.launch
  21 import kotlinx.coroutines.runBlocking
  22 import org.onap.ccsdk.cds.blueprintsprocessor.core.api.data.ExecutionServiceInput
  23 import org.onap.ccsdk.cds.blueprintsprocessor.message.service.BluePrintMessageLibPropertyService
  24 import org.onap.ccsdk.cds.blueprintsprocessor.message.service.BlueprintMessageConsumerService
  25 import org.onap.ccsdk.cds.controllerblueprints.core.BluePrintProcessorException
  26 import org.onap.ccsdk.cds.controllerblueprints.core.jsonAsType
  27 import org.onap.ccsdk.cds.controllerblueprints.core.logger
  28 import org.onap.ccsdk.cds.controllerblueprints.core.updateErrorMessage
  29 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty
  30 import org.springframework.boot.context.event.ApplicationReadyEvent
  31 import org.springframework.context.event.EventListener
  32 import org.springframework.stereotype.Service
  33 import java.util.concurrent.Phaser
  34 import javax.annotation.PreDestroy
  35
  36 @ConditionalOnProperty(
  37     name = ["blueprintsprocessor.messageconsumer.self-service-api.kafkaEnable"],
  38     havingValue = "true"
  39 )
  40 @Service
  41 open class BluePrintProcessingKafkaConsumer(
  42     private val bluePrintMessageLibPropertyService: BluePrintMessageLibPropertyService,
  43     private val executionServiceHandler: ExecutionServiceHandler
  44 ) {
  45
  46     val log = logger(BluePrintProcessingKafkaConsumer::class)
  47
  48     private val ph = Phaser(1)
  49
  50     private lateinit var blueprintMessageConsumerService: BlueprintMessageConsumerService
  51
  52     companion object {
  53         const val CONSUMER_SELECTOR = "self-service-api"
  54         const val PRODUCER_SELECTOR = "self-service-api"
  55     }
  56
  57     @EventListener(ApplicationReadyEvent::class)
  58     fun setupMessageListener() = runBlocking {
  59         try {
  60             log.info(
  61                 "Setting up message consumer($CONSUMER_SELECTOR)" +
  62                         "message producer($PRODUCER_SELECTOR)..."
  63             )
  64
  65             /** Get the Message Consumer Service **/
  66             blueprintMessageConsumerService = try {
  67                 bluePrintMessageLibPropertyService
  68                     .blueprintMessageConsumerService(CONSUMER_SELECTOR)
  69             } catch (e: BluePrintProcessorException) {
  70                 val errorMsg = "Failed creating Kafka consumer message service."
  71                 throw e.updateErrorMessage(SelfServiceApiDomains.SELF_SERVICE_API, errorMsg,
  72                         "Wrong Kafka selector provided or internal error in Kafka service.")
  73             } catch (e: Exception) {
  74                 throw BluePrintProcessorException("failed to create consumer service ${e.message}")
  75             }
  76
  77             /** Get the Message Producer Service **/
  78             val blueprintMessageProducerService = try {
  79                 bluePrintMessageLibPropertyService
  80                         .blueprintMessageProducerService(PRODUCER_SELECTOR)
  81             } catch (e: BluePrintProcessorException) {
  82                 val errorMsg = "Failed creating Kafka producer message service."
  83                 throw e.updateErrorMessage(SelfServiceApiDomains.SELF_SERVICE_API, errorMsg,
  84                         "Wrong Kafka selector provided or internal error in Kafka service.")
  85             } catch (e: Exception) {
  86                 throw BluePrintProcessorException("failed to create producer service ${e.message}")
  87             }
  88
  89             launch {
  90                 /** Subscribe to the consumer topics */
  91                 val additionalConfig: MutableMap<String, Any> = hashMapOf()
  92                 val channel = blueprintMessageConsumerService.subscribe(additionalConfig)
  93                 channel.consumeEach { message ->
  94                     launch {
  95                         try {
  96                             ph.register()
  97                             log.trace("Consumed Message : $message")
  98                             val executionServiceInput = message.jsonAsType<ExecutionServiceInput>()
  99                             val executionServiceOutput = executionServiceHandler.doProcess(executionServiceInput)
 100                             blueprintMessageProducerService.sendMessage(executionServiceOutput)
 101                         } catch (e: Exception) {
 102                             log.error("failed in processing the consumed message : $message", e)
 103                         } finally {
 104                             ph.arriveAndDeregister()
 105                         }
 106                     }
 107                 }
 108             }
 109         } catch (e: Exception) {
 110             log.error(
 111                 "failed to start message consumer($CONSUMER_SELECTOR) " +
 112                         "message producer($PRODUCER_SELECTOR) ", e
 113             )
 114         }
 115     }
 116
 117     @PreDestroy
 118     fun shutdownMessageListener() = runBlocking {
 119         try {
 120             log.info(
 121                 "Shutting down message consumer($CONSUMER_SELECTOR)" +
 122                         "message producer($PRODUCER_SELECTOR)..."
 123             )
 124             blueprintMessageConsumerService.shutDown()
 125             ph.arriveAndAwaitAdvance()
 126         } catch (e: Exception) {
 127             log.error("failed to shutdown message listener($CONSUMER_SELECTOR)", e)
 128         }
 129     }
 130 }