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

   1 /*
   2  * ============LICENSE_START=======================================================
   3  * dcaegen2-collectors-veshv
   4  * ================================================================================
   5  * Copyright (C) 2018 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 org.onap.dcae.collectors.veshv.boundary.ConfigurationProvider
  23 import org.onap.dcae.collectors.veshv.healthcheck.api.HealthDescription
  24 import org.onap.dcae.collectors.veshv.healthcheck.api.HealthState
  25 import org.onap.dcae.collectors.veshv.model.CollectorConfiguration
  26 import org.onap.dcae.collectors.veshv.model.ConfigurationProviderParams
  27 import org.onap.dcae.collectors.veshv.utils.logging.Logger
  28 import reactor.core.publisher.Flux
  29 import reactor.core.publisher.Mono
  30 import reactor.retry.Jitter
  31 import reactor.retry.Retry
  32 import java.io.StringReader
  33 import java.time.Duration
  34 import java.util.*
  35 import java.util.concurrent.atomic.AtomicReference
  36 import javax.json.Json
  37 import javax.json.JsonObject
  38
  39
  40 /**
  41  * @author Jakub Dudycz <jakub.dudycz@nokia.com>
  42  * @since May 2018
  43  */
  44 internal class ConsulConfigurationProvider(private val http: HttpAdapter,
  45                                            private val url: String,
  46                                            private val firstRequestDelay: Duration,
  47                                            private val requestInterval: Duration,
  48                                            private val healthState: HealthState,
  49                                            retrySpec: Retry<Any>
  50
  51 ) : ConfigurationProvider {
  52
  53     private val lastConfigurationHash: AtomicReference<Int> = AtomicReference(0)
  54     private val retry = retrySpec
  55             .doOnRetry {
  56                 logger.warn("Could not get fresh configuration", it.exception())
  57                 healthState.changeState(HealthDescription.RETRYING_FOR_CONSUL_CONFIGURATION)
  58             }
  59
  60     constructor(http: HttpAdapter,
  61                 params: ConfigurationProviderParams) : this(
  62             http,
  63             params.configurationUrl,
  64             params.firstRequestDelay,
  65             params.requestInterval,
  66             HealthState.INSTANCE,
  67             Retry.any<Any>()
  68                     .retryMax(MAX_RETRIES)
  69                     .fixedBackoff(params.requestInterval.dividedBy(BACKOFF_INTERVAL_FACTOR))
  70                     .jitter(Jitter.random())
  71     )
  72
  73     override fun invoke(): Flux<CollectorConfiguration> =
  74             Flux.interval(firstRequestDelay, requestInterval)
  75                     .flatMap { askForConfig() }
  76                     .map(::parseJsonResponse)
  77                     .map(::extractEncodedConfiguration)
  78                     .flatMap(::filterDifferentValues)
  79                     .map(::decodeConfiguration)
  80                     .map(::createCollectorConfiguration)
  81                     .retryWhen(retry)
  82
  83     private fun askForConfig(): Mono<String> = http.get(url)
  84
  85     private fun parseJsonResponse(responseString: String): JsonObject =
  86             Json.createReader(StringReader(responseString)).readArray().first().asJsonObject()
  87
  88     private fun extractEncodedConfiguration(response: JsonObject): String =
  89             response.getString("Value")
  90
  91     private fun filterDifferentValues(base64Value: String): Mono<String> {
  92         val newHash = hashOf(base64Value)
  93         return if (newHash == lastConfigurationHash.get()) {
  94             Mono.empty()
  95         } else {
  96             lastConfigurationHash.set(newHash)
  97             Mono.just(base64Value)
  98         }
  99     }
 100
 101     private fun hashOf(str: String) = str.hashCode()
 102
 103     private fun decodeConfiguration(encodedConfiguration: String): JsonObject {
 104         val decodedValue = String(Base64.getDecoder().decode(encodedConfiguration))
 105         logger.info("Obtained new configuration from consul:\n$decodedValue")
 106         return Json.createReader(StringReader(decodedValue)).readObject()
 107     }
 108
 109     private fun createCollectorConfiguration(configuration: JsonObject): CollectorConfiguration {
 110         val routing = configuration.getJsonArray("collector.routing")
 111
 112         return CollectorConfiguration(
 113                 kafkaBootstrapServers = configuration.getString("dmaap.kafkaBootstrapServers"),
 114                 routing = org.onap.dcae.collectors.veshv.model.routing {
 115                     for (route in routing) {
 116                         val routeObj = route.asJsonObject()
 117                         defineRoute {
 118                             fromDomain(routeObj.getString("fromDomain"))
 119                             toTopic(routeObj.getString("toTopic"))
 120                             withFixedPartitioning()
 121                         }
 122                     }
 123                 }.build()
 124         )
 125     }
 126
 127     companion object {
 128         private const val MAX_RETRIES = 5
 129         private const val BACKOFF_INTERVAL_FACTOR = 30L
 130         private val logger = Logger(ConsulConfigurationProvider::class)
 131     }
 132 }
 133