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

   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 org.onap.ves.VesEventV5.VesEvent.CommonEventHeader.Domain.forNumber
  29 import reactor.core.publisher.Flux
  30 import reactor.core.publisher.Mono
  31 import reactor.retry.Jitter
  32 import reactor.retry.Retry
  33 import java.io.StringReader
  34 import java.time.Duration
  35 import java.util.*
  36 import java.util.concurrent.atomic.AtomicReference
  37 import javax.json.Json
  38 import javax.json.JsonObject
  39
  40
  41 /**
  42  * @author Jakub Dudycz <jakub.dudycz@nokia.com>
  43  * @since May 2018
  44  */
  45 internal class ConsulConfigurationProvider(private val http: HttpAdapter,
  46                                            private val url: String,
  47                                            private val firstRequestDelay: Duration,
  48                                            private val requestInterval: Duration,
  49                                            private val healthState: HealthState,
  50                                            retrySpec: Retry<Any>
  51
  52 ) : ConfigurationProvider {
  53
  54     private val lastConfigurationHash: AtomicReference<Int> = AtomicReference(0)
  55     private val retry = retrySpec
  56             .doOnRetry {
  57                 logger.warn("Could not get fresh configuration", it.exception())
  58                 healthState.changeState(HealthDescription.RETRYING_FOR_CONSUL_CONFIGURATION)
  59             }
  60
  61     constructor(http: HttpAdapter,
  62                 params: ConfigurationProviderParams) : this(
  63             http,
  64             params.configurationUrl,
  65             params.firstRequestDelay,
  66             params.requestInterval,
  67             HealthState.INSTANCE,
  68             Retry.any<Any>()
  69                     .retryMax(MAX_RETRIES)
  70                     .fixedBackoff(params.requestInterval.dividedBy(BACKOFF_INTERVAL_FACTOR))
  71                     .jitter(Jitter.random())
  72     )
  73
  74     override fun invoke(): Flux<CollectorConfiguration> =
  75             Flux.interval(firstRequestDelay, requestInterval)
  76                     .flatMap { askForConfig() }
  77                     .map(::parseJsonResponse)
  78                     .map(::extractEncodedConfiguration)
  79                     .flatMap(::filterDifferentValues)
  80                     .map(::decodeConfiguration)
  81                     .map(::createCollectorConfiguration)
  82                     .retryWhen(retry)
  83
  84     private fun askForConfig(): Mono<String> = http.get(url)
  85
  86     private fun parseJsonResponse(responseString: String): JsonObject =
  87             Json.createReader(StringReader(responseString)).readArray().first().asJsonObject()
  88
  89     private fun extractEncodedConfiguration(response: JsonObject): String =
  90             response.getString("Value")
  91
  92     private fun filterDifferentValues(base64Value: String): Mono<String> {
  93         val newHash = hashOf(base64Value)
  94         return if (newHash == lastConfigurationHash.get()) {
  95             Mono.empty()
  96         } else {
  97             lastConfigurationHash.set(newHash)
  98             Mono.just(base64Value)
  99         }
 100     }
 101
 102     private fun hashOf(str: String) = str.hashCode()
 103
 104     private fun decodeConfiguration(encodedConfiguration: String): JsonObject {
 105         val decodedValue = String(Base64.getDecoder().decode(encodedConfiguration))
 106         logger.info("Obtained new configuration from consul:\n$decodedValue")
 107         return Json.createReader(StringReader(decodedValue)).readObject()
 108     }
 109
 110     private fun createCollectorConfiguration(configuration: JsonObject): CollectorConfiguration {
 111         val routing = configuration.getJsonArray("collector.routing")
 112
 113         return CollectorConfiguration(
 114                 kafkaBootstrapServers = configuration.getString("dmaap.kafkaBootstrapServers"),
 115                 routing = org.onap.dcae.collectors.veshv.model.routing {
 116                     for (route in routing) {
 117                         val routeObj = route.asJsonObject()
 118                         defineRoute {
 119                             fromDomain(forNumber(routeObj.getInt("fromDomain")))
 120                             toTopic(routeObj.getString("toTopic"))
 121                             withFixedPartitioning()
 122                         }
 123                     }
 124                 }.build()
 125         )
 126     }
 127
 128     companion object {
 129         private const val MAX_RETRIES = 5
 130         private const val BACKOFF_INTERVAL_FACTOR = 30L
 131         private val logger = Logger(ConsulConfigurationProvider::class)
 132     }
 133 }
 134