sources/hv-collector-core/src/main/kotlin/org/onap/dcae/collectors/veshv/impl/adapters/ConfigurationProviderImpl.kt

   1 /*
   2  * ============LICENSE_START=======================================================
   3  * dcaegen2-collectors-veshv
   4  * ================================================================================
   5  * Copyright (C) 2018-2019 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.impl.adapters
  21
  22 import com.google.gson.JsonObject
  23 import org.onap.dcae.collectors.veshv.boundary.ConfigurationProvider
  24 import org.onap.dcae.collectors.veshv.healthcheck.api.HealthDescription
  25 import org.onap.dcae.collectors.veshv.healthcheck.api.HealthState
  26 import org.onap.dcae.collectors.veshv.model.CollectorConfiguration
  27 import org.onap.dcae.collectors.veshv.model.ConfigurationProviderParams
  28 import org.onap.dcae.collectors.veshv.model.ServiceContext
  29 import org.onap.dcae.collectors.veshv.model.routing
  30 import org.onap.dcae.collectors.veshv.utils.logging.Logger
  31 import org.onap.dcae.collectors.veshv.utils.logging.onErrorLog
  32 import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.CbsClient
  33 import org.onap.dcaegen2.services.sdk.rest.services.model.logging.RequestDiagnosticContext
  34 import reactor.core.publisher.Flux
  35 import reactor.core.publisher.Mono
  36 import reactor.retry.Jitter
  37 import reactor.retry.Retry
  38 import java.time.Duration
  39
  40
  41 /**
  42  * @author Jakub Dudycz <jakub.dudycz@nokia.com>
  43  * @since May 2018
  44  */
  45 internal class ConfigurationProviderImpl(private val cbsClientMono: Mono<CbsClient>,
  46                                          private val firstRequestDelay: Duration,
  47                                          private val requestInterval: Duration,
  48                                          private val healthState: HealthState,
  49                                          retrySpec: Retry<Any>
  50
  51 ) : ConfigurationProvider {
  52     constructor(cbsClientMono: Mono<CbsClient>, params: ConfigurationProviderParams) : this(
  53             cbsClientMono,
  54             params.firstRequestDelay,
  55             params.requestInterval,
  56             HealthState.INSTANCE,
  57             Retry.any<Any>()
  58                     .retryMax(MAX_RETRIES)
  59                     .fixedBackoff(params.requestInterval)
  60                     .jitter(Jitter.random())
  61     )
  62
  63     private val retry = retrySpec.doOnRetry {
  64         logger.withWarn(ServiceContext::mdc) {
  65             log("Exception from configuration provider client, retrying subscription", it.exception())
  66         }
  67         healthState.changeState(HealthDescription.RETRYING_FOR_DYNAMIC_CONFIGURATION)
  68     }
  69
  70     override fun invoke(): Flux<CollectorConfiguration> =
  71             cbsClientMono
  72                     .doOnNext { logger.info(ServiceContext::mdc) { "CBS client successfully created" } }
  73                     .onErrorLog(logger, ServiceContext::mdc) { "Failed to retrieve CBS client" }
  74                     .retryWhen(retry)
  75                     .doFinally { logger.trace(ServiceContext::mdc) { "CBS client subscription finished" } }
  76                     .flatMapMany(::handleUpdates)
  77
  78     private fun handleUpdates(cbsClient: CbsClient): Flux<CollectorConfiguration> = cbsClient
  79             .updates(RequestDiagnosticContext.create(),
  80                     firstRequestDelay,
  81                     requestInterval)
  82             .doOnNext { logger.info(ServiceContext::mdc) { "Received new configuration:\n$it" } }
  83             .map(::createCollectorConfiguration)
  84             .onErrorLog(logger, ServiceContext::mdc) { "Error while creating configuration" }
  85             .retryWhen(retry)
  86
  87
  88     private fun createCollectorConfiguration(configuration: JsonObject): CollectorConfiguration =
  89             try {
  90                 val routingArray = configuration.getAsJsonArray(ROUTING_CONFIGURATION_KEY)
  91                 CollectorConfiguration(
  92                         routing {
  93                             for (route in routingArray) {
  94                                 val routeObj = route.asJsonObject
  95                                 defineRoute {
  96                                     fromDomain(routeObj.getPrimitiveAsString(DOMAIN_CONFIGURATION_KEY))
  97                                     toTopic(routeObj.getPrimitiveAsString(TOPIC_CONFIGURATION_KEY))
  98                                     withFixedPartitioning()
  99                                 }
 100                             }
 101                         }.build()
 102                 )
 103             } catch (e: NullPointerException) {
 104                 throw ParsingException("Failed to parse configuration", e)
 105             }
 106
 107     private fun JsonObject.getPrimitiveAsString(memberName: String) = getAsJsonPrimitive(memberName).asString
 108
 109
 110     companion object {
 111         private const val ROUTING_CONFIGURATION_KEY = "collector.routing"
 112         private const val DOMAIN_CONFIGURATION_KEY = "fromDomain"
 113         private const val TOPIC_CONFIGURATION_KEY = "toTopic"
 114
 115         private const val MAX_RETRIES = 5L
 116         private val logger = Logger(ConfigurationProviderImpl::class)
 117     }
 118 }