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.config.impl
  21
  22 import arrow.core.None
  23 import arrow.core.Option
  24 import arrow.core.Some
  25 import com.google.gson.JsonObject
  26 import org.onap.dcae.collectors.veshv.config.api.ConfigurationStateListener
  27 import org.onap.dcae.collectors.veshv.config.api.model.CbsConfiguration
  28 import org.onap.dcae.collectors.veshv.config.api.model.Route
  29 import org.onap.dcae.collectors.veshv.config.api.model.Routing
  30 import org.onap.dcae.collectors.veshv.utils.logging.Logger
  31 import org.onap.dcae.collectors.veshv.utils.logging.MappedDiagnosticContext
  32 import org.onap.dcae.collectors.veshv.utils.logging.onErrorLog
  33 import org.onap.dcaegen2.services.sdk.model.streams.StreamType.KAFKA
  34 import org.onap.dcaegen2.services.sdk.model.streams.dmaap.KafkaSink
  35 import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.CbsClient
  36 import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.CbsRequests
  37 import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.streams.DataStreams
  38 import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.streams.StreamFromGsonParser
  39 import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.streams.StreamFromGsonParsers
  40 import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.streams.StreamPredicates.streamOfType
  41 import org.onap.dcaegen2.services.sdk.rest.services.model.logging.RequestDiagnosticContext
  42 import reactor.core.publisher.Flux
  43 import reactor.core.publisher.Mono
  44 import reactor.retry.Jitter
  45 import reactor.retry.Retry
  46
  47 /**
  48  * @author Jakub Dudycz <jakub.dudycz@nokia.com>
  49  * @since May 2018
  50  */
  51 internal class CbsConfigurationProvider(private val cbsClientMono: Mono<CbsClient>,
  52                                         private val cbsConfiguration: CbsConfiguration,
  53                                         private val streamParser: StreamFromGsonParser<KafkaSink>,
  54                                         private val configurationStateListener: ConfigurationStateListener,
  55                                         retrySpec: Retry<Any>,
  56                                         private val mdc: MappedDiagnosticContext
  57
  58 ) {
  59     constructor(cbsClientMono: Mono<CbsClient>,
  60                 cbsConfig: CbsConfiguration,
  61                 configurationStateListener: ConfigurationStateListener,
  62                 mdc: MappedDiagnosticContext) :
  63             this(
  64                     cbsClientMono,
  65                     cbsConfig,
  66                     StreamFromGsonParsers.kafkaSinkParser(),
  67                     configurationStateListener,
  68                     Retry.any<Any>()
  69                             .retryMax(MAX_RETRIES)
  70                             .fixedBackoff(cbsConfig.requestInterval)
  71                             .jitter(Jitter.random()),
  72                     mdc
  73             )
  74
  75     private val retry = retrySpec.doOnRetry {
  76         logger.withWarn(mdc) {
  77             log("Exception from configuration provider client, retrying subscription", it.exception())
  78         }
  79         configurationStateListener.retrying()
  80     }
  81
  82     operator fun invoke(): Flux<PartialConfiguration> =
  83             cbsClientMono
  84                     .doOnNext { logger.info(mdc) { "CBS client successfully created" } }
  85                     .onErrorLog(logger, mdc) { "Failed to retrieve CBS client" }
  86                     .retryWhen(retry)
  87                     .doFinally { logger.trace(mdc) { "CBS client subscription finished" } }
  88                     .flatMapMany(::handleUpdates)
  89
  90     private fun handleUpdates(cbsClient: CbsClient) = cbsClient
  91             .updates(CbsRequests.getConfiguration(RequestDiagnosticContext.create()),
  92                     cbsConfiguration.firstRequestDelay,
  93                     cbsConfiguration.requestInterval)
  94             .doOnNext { logger.info(mdc) { "Received new configuration:\n$it" } }
  95             .map(::createRoutingDescription)
  96             .onErrorLog(logger, mdc) { "Error while creating configuration" }
  97             .retryWhen(retry)
  98             .map { PartialConfiguration(routing = it) }
  99
 100     private fun createRoutingDescription(configuration: JsonObject): Option<Routing> = try {
 101         val routes = DataStreams.namedSinks(configuration)
 102                 .filter(streamOfType(KAFKA))
 103                 .map(streamParser::unsafeParse)
 104                 .map { Route(it.name(), it) }
 105                 .asIterable()
 106                 .toList()
 107         Some(routes)
 108     } catch (e: NullPointerException) {
 109         logger.withWarn(mdc) {
 110             log("Invalid streams configuration", e)
 111         }
 112         None
 113     }
 114
 115     companion object {
 116         private const val MAX_RETRIES = 5L
 117         private val logger = Logger(CbsConfigurationProvider::class)
 118     }
 119 }