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/*
* ============LICENSE_START=======================================================
* dcaegen2-collectors-veshv
* ================================================================================
* Copyright (C) 2018 NOKIA
* ================================================================================
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ============LICENSE_END=========================================================
*/
package org.onap.dcae.collectors.veshv.impl.adapters
import org.onap.dcae.collectors.veshv.boundary.ConfigurationProvider
import org.onap.dcae.collectors.veshv.healthcheck.api.HealthDescription
import org.onap.dcae.collectors.veshv.healthcheck.api.HealthState
import org.onap.dcae.collectors.veshv.model.CollectorConfiguration
import org.onap.dcae.collectors.veshv.model.ConfigurationProviderParams
import org.onap.dcae.collectors.veshv.utils.logging.Logger
import reactor.core.publisher.Flux
import reactor.core.publisher.Mono
import reactor.retry.Jitter
import reactor.retry.Retry
import java.io.StringReader
import java.time.Duration
import java.util.concurrent.atomic.AtomicReference
import javax.json.Json
import javax.json.JsonObject
/**
* @author Jakub Dudycz <jakub.dudycz@nokia.com>
* @since May 2018
*/
internal class ConsulConfigurationProvider(private val http: HttpAdapter,
private val url: String,
private val firstRequestDelay: Duration,
private val requestInterval: Duration,
private val healthState: HealthState,
retrySpec: Retry<Any>
) : ConfigurationProvider {
private val lastConfigurationHash: AtomicReference<Int> = AtomicReference(0)
private val retry = retrySpec
.doOnRetry {
logger.withWarn { log("Could not get fresh configuration", it.exception()) }
healthState.changeState(HealthDescription.RETRYING_FOR_CONSUL_CONFIGURATION)
}
constructor(http: HttpAdapter,
params: ConfigurationProviderParams) : this(
http,
params.configurationUrl,
params.firstRequestDelay,
params.requestInterval,
HealthState.INSTANCE,
Retry.any<Any>()
.retryMax(MAX_RETRIES)
.fixedBackoff(params.requestInterval.dividedBy(BACKOFF_INTERVAL_FACTOR))
.jitter(Jitter.random())
)
override fun invoke(): Flux<CollectorConfiguration> =
Flux.interval(firstRequestDelay, requestInterval)
.concatMap { askForConfig() }
.flatMap(::filterDifferentValues)
.map(::parseJsonResponse)
.map(::createCollectorConfiguration)
.retryWhen(retry)
private fun askForConfig(): Mono<String> = http.get(url)
private fun filterDifferentValues(configurationString: String) =
hashOf(configurationString).let {
if (it == lastConfigurationHash.get()) {
logger.trace { "No change detected in consul configuration" }
Mono.empty()
} else {
logger.info { "Obtained new configuration from consul:\n${configurationString}" }
lastConfigurationHash.set(it)
Mono.just(configurationString)
}
}
private fun hashOf(str: String) = str.hashCode()
private fun parseJsonResponse(responseString: String): JsonObject =
Json.createReader(StringReader(responseString)).readObject()
private fun createCollectorConfiguration(configuration: JsonObject): CollectorConfiguration {
val routing = configuration.getJsonArray("collector.routing")
return CollectorConfiguration(
kafkaBootstrapServers = configuration.getString("dmaap.kafkaBootstrapServers"),
routing = org.onap.dcae.collectors.veshv.model.routing {
for (route in routing) {
val routeObj = route.asJsonObject()
defineRoute {
fromDomain(routeObj.getString("fromDomain"))
toTopic(routeObj.getString("toTopic"))
withFixedPartitioning()
}
}
}.build()
)
}
companion object {
private const val MAX_RETRIES = 5L
private const val BACKOFF_INTERVAL_FACTOR = 30L
private val logger = Logger(ConsulConfigurationProvider::class)
}
}
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