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.toOption
  23 import com.google.gson.JsonObject
  24 import org.onap.dcae.collectors.veshv.config.api.ConfigurationStateListener
  25 import org.onap.dcae.collectors.veshv.config.api.model.CbsConfiguration
  26 import org.onap.dcae.collectors.veshv.utils.logging.Logger
  27 import org.onap.dcae.collectors.veshv.utils.logging.MappedDiagnosticContext
  28 import org.onap.dcae.collectors.veshv.utils.logging.onErrorLog
  29 import org.onap.dcae.collectors.veshv.utils.reader
  30 import org.onap.dcaegen2.services.sdk.model.streams.StreamType.KAFKA
  31 import org.onap.dcaegen2.services.sdk.model.streams.dmaap.KafkaSink
  32 import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.CbsClient
  33 import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.CbsRequests
  34 import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.streams.DataStreams
  35 import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.streams.StreamFromGsonParser
  36 import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.streams.StreamFromGsonParsers
  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
  44 /**
  45  * @author Jakub Dudycz <jakub.dudycz@nokia.com>
  46  * @since May 2018
  47  */
  48 internal class CbsConfigurationProvider(private val cbsClientMono: Mono<CbsClient>,
  49                                         private val cbsConfiguration: CbsConfiguration,
  50                                         private val configParser: JsonConfigurationParser,
  51                                         private val streamParser: StreamFromGsonParser<KafkaSink>,
  52                                         private val configurationStateListener: ConfigurationStateListener,
  53                                         private val mdc: MappedDiagnosticContext,
  54                                         retrySpec: Retry<Any>
  55
  56 ) {
  57     constructor(cbsClientMono: Mono<CbsClient>,
  58                 cbsConfig: CbsConfiguration,
  59                 configParser: JsonConfigurationParser,
  60                 configurationStateListener: ConfigurationStateListener,
  61                 mdc: MappedDiagnosticContext) :
  62             this(
  63                     cbsClientMono,
  64                     cbsConfig,
  65                     configParser,
  66                     StreamFromGsonParsers.kafkaSinkParser(),
  67                     configurationStateListener,
  68                     mdc,
  69                     Retry.any<Any>()
  70                             .retryMax(MAX_RETRIES)
  71                             .fixedBackoff(cbsConfig.requestInterval)
  72                             .jitter(Jitter.random())
  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$it" } }
  95             .map(::parseConfiguration)
  96             .doOnNext { logger.info(mdc) { "Successfully parsed configuration json to:\n$it" } }
  97             .onErrorLog(logger, mdc) { "Error while creating configuration" }
  98             .retryWhen(retry)
  99
 100     private fun parseConfiguration(json: JsonObject) =
 101             configParser
 102                     .parse(json.reader())
 103                     .apply { streamPublishers = extractStreamDefinitions(json).toOption() }
 104
 105     private fun extractStreamDefinitions(configuration: JsonObject): List<KafkaSink> =
 106             DataStreams.namedSinks(configuration)
 107                     .filter(streamOfType(KAFKA))
 108                     .map(streamParser::unsafeParse)
 109                     .asIterable()
 110                     .toList()
 111
 112     companion object {
 113         private const val MAX_RETRIES = 5L
 114         private val logger = Logger(CbsConfigurationProvider::class)
 115     }
 116 }