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.model.CollectorConfiguration
  24 import org.onap.dcae.collectors.veshv.model.routing
  25 import org.onap.ves.VesEventV5.VesEvent.CommonEventHeader.Domain.HVRANMEAS
  26 import org.onap.ves.VesEventV5.VesEvent.CommonEventHeader.Domain.forNumber
  27 import org.slf4j.LoggerFactory
  28 import reactor.core.publisher.Flux
  29 import reactor.core.publisher.Mono
  30 import java.io.StringReader
  31 import java.time.Duration
  32 import java.util.*
  33 import java.util.concurrent.atomic.AtomicReference
  34 import javax.json.Json
  35 import javax.json.JsonObject
  36
  37
  38 /**
  39  * @author Jakub Dudycz <jakub.dudycz@nokia.com>
  40  * @since May 2018
  41  */
  42 internal class ConsulConfigurationProvider(private val url: String,
  43                                            private val http: HttpAdapter,
  44                                            private val firstRequestDelay: Duration
  45 ) : ConfigurationProvider {
  46
  47     private val lastModifyIndex: AtomicReference<Int> = AtomicReference(0)
  48     private val lastConfigurationHash: AtomicReference<Int> = AtomicReference(0)
  49
  50     override fun invoke(): Flux<CollectorConfiguration> =
  51             Flux.concat(createDefaultConfigurationFlux(), createConsulFlux())
  52
  53     private fun createDefaultConfigurationFlux(): Mono<CollectorConfiguration> = Mono.just(
  54             CollectorConfiguration(
  55                     kafkaBootstrapServers = "kafka:9092",
  56                     routing = routing {
  57                         defineRoute {
  58                             fromDomain(HVRANMEAS)
  59                             toTopic("ves_hvRanMeas")
  60                             withFixedPartitioning()
  61                         }
  62                     }.build())
  63     ).doOnNext { logger.info("Applied default configuration") }
  64
  65     private fun createConsulFlux(): Flux<CollectorConfiguration> =
  66             http.get(url, mapOf(Pair("index", lastModifyIndex.get())))
  67                     .doOnError {
  68                         logger.error("Encountered an error " +
  69                                 "when trying to acquire configuration from consul. Shutting down..")
  70                     }
  71                     .map(::parseJsonResponse)
  72                     .doOnNext(::updateModifyIndex)
  73                     .map(::extractEncodedConfiguration)
  74                     .flatMap(::filterDifferentValues)
  75                     .map(::decodeConfiguration)
  76                     .map(::createCollectorConfiguration)
  77                     .repeat()
  78                     .delaySubscription(firstRequestDelay)
  79
  80     private fun parseJsonResponse(responseString: String): JsonObject =
  81             Json.createReader(StringReader(responseString)).readArray().first().asJsonObject()
  82
  83     private fun updateModifyIndex(response: JsonObject) =
  84             lastModifyIndex.set(response.getInt("ModifyIndex"))
  85
  86     private fun extractEncodedConfiguration(response: JsonObject): String =
  87             response.getString("Value")
  88
  89     private fun filterDifferentValues(base64Value: String): Mono<String> {
  90         val newHash = hashOf(base64Value)
  91         return if (newHash == lastConfigurationHash.get()) {
  92             Mono.empty()
  93         } else {
  94             lastConfigurationHash.set(newHash)
  95             Mono.just(base64Value)
  96         }
  97     }
  98
  99     private fun hashOf(str: String) = str.hashCode()
 100
 101     private fun decodeConfiguration(encodedConfiguration: String): JsonObject {
 102         val decodedValue = String(Base64.getDecoder().decode(encodedConfiguration))
 103         logger.info("Obtained new configuration from consul:\n$decodedValue")
 104         return Json.createReader(StringReader(decodedValue)).readObject()
 105     }
 106
 107     private fun createCollectorConfiguration(configuration: JsonObject): CollectorConfiguration {
 108         val routing = configuration.getJsonArray("routing")
 109
 110         return CollectorConfiguration(
 111                 kafkaBootstrapServers = configuration.getString("kafkaBootstrapServers"),
 112                 routing = org.onap.dcae.collectors.veshv.model.routing {
 113                     for (route in routing) {
 114                         val routeObj = route.asJsonObject()
 115                         defineRoute {
 116                             fromDomain(forNumber(routeObj.getInt("fromDomain")))
 117                             toTopic(routeObj.getString("toTopic"))
 118                             withFixedPartitioning()
 119                         }
 120                     }
 121                 }.build()
 122         )
 123     }
 124
 125     companion object {
 126         private val logger = LoggerFactory.getLogger(ConsulConfigurationProvider::class.java)
 127     }
 128 }
 129