gerrit.onap Code Review - dcaegen2/collectors/hv-ves.git/blob

   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.config.api.model.CbsConfiguration
  25 import org.onap.dcae.collectors.veshv.healthcheck.api.HealthDescription
  26 import org.onap.dcae.collectors.veshv.healthcheck.api.HealthState
  27 import org.onap.dcae.collectors.veshv.model.ServiceContext
  28 import org.onap.dcae.collectors.veshv.utils.logging.Logger
  29 import org.onap.dcae.collectors.veshv.utils.logging.onErrorLog
  30 import org.onap.dcaegen2.services.sdk.model.streams.StreamType.KAFKA
  31 import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.CbsClient
  32 import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.CbsRequests
  33 import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.streams.DataStreams
  34 import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.streams.StreamFromGsonParser
  35 import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.streams.StreamFromGsonParsers
  36 import org.onap.dcaegen2.services.sdk.model.streams.dmaap.KafkaSink
  37 import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.streams.StreamPredicates.streamOfType
  38 import org.onap.dcaegen2.services.sdk.rest.services.model.logging.RequestDiagnosticContext
  39 import reactor.core.publisher.Flux
  40 import reactor.core.publisher.Mono
  41 import reactor.retry.Jitter
  42 import reactor.retry.Retry
  43 import java.time.Duration
  44
  45 /**
  46  * @author Jakub Dudycz <jakub.dudycz@nokia.com>
  47  * @since May 2018
  48  */
  49 internal class ConfigurationProviderImpl(private val cbsClientMono: Mono<CbsClient>,
  50                                          private val firstRequestDelay: Duration,
  51                                          private val requestInterval: Duration,
  52                                          private val healthState: HealthState,
  53                                          private val streamParser: StreamFromGsonParser<KafkaSink>,
  54                                          retrySpec: Retry<Any>
  55
  56 ) : ConfigurationProvider {
  57     constructor(cbsClientMono: Mono<CbsClient>, params: CbsConfiguration) : this(
  58             cbsClientMono,
  59             params.firstRequestDelay,
  60             params.requestInterval,
  61             HealthState.INSTANCE,
  62             StreamFromGsonParsers.kafkaSinkParser(),
  63             Retry.any<Any>()
  64                     .retryMax(MAX_RETRIES)
  65                     .fixedBackoff(params.requestInterval)
  66                     .jitter(Jitter.random())
  67     )
  68
  69     private val retry = retrySpec.doOnRetry {
  70         logger.withWarn(ServiceContext::mdc) {
  71             log("Exception from configuration provider client, retrying subscription", it.exception())
  72         }
  73         healthState.changeState(HealthDescription.RETRYING_FOR_DYNAMIC_CONFIGURATION)
  74     }
  75
  76     override fun invoke(): Flux<Sequence<KafkaSink>> =
  77             cbsClientMono
  78                     .doOnNext { logger.info(ServiceContext::mdc) { "CBS client successfully created" } }
  79                     .onErrorLog(logger, ServiceContext::mdc) { "Failed to retrieve CBS client" }
  80                     .retryWhen(retry)
  81                     .doFinally { logger.trace(ServiceContext::mdc) { "CBS client subscription finished" } }
  82                     .flatMapMany(::handleUpdates)
  83
  84     private fun handleUpdates(cbsClient: CbsClient): Flux<Sequence<KafkaSink>> = cbsClient
  85             .updates(CbsRequests.getConfiguration(RequestDiagnosticContext.create()),
  86                     firstRequestDelay,
  87                     requestInterval)
  88             .doOnNext { logger.info(ServiceContext::mdc) { "Received new configuration:\n$it" } }
  89             .map(::createCollectorConfiguration)
  90             .onErrorLog(logger, ServiceContext::mdc) { "Error while creating configuration" }
  91             .retryWhen(retry)
  92
  93
  94     private fun createCollectorConfiguration(configuration: JsonObject): Sequence<KafkaSink> =
  95             try {
  96                 DataStreams.namedSinks(configuration)
  97                         .filter(streamOfType(KAFKA))
  98                         .map(streamParser::unsafeParse)
  99                         .asSequence()
 100             } catch (e: NullPointerException) {
 101                 throw ParsingException("Failed to parse configuration", e)
 102             }
 103
 104     companion object {
 105         private const val MAX_RETRIES = 5L
 106         private val logger = Logger(ConfigurationProviderImpl::class)
 107     }
 108 }