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/*
* ============LICENSE_START=======================================================
* dcaegen2-collectors-veshv
* ================================================================================
* Copyright (C) 2018-2019 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 com.google.gson.JsonObject
import org.onap.dcae.collectors.veshv.boundary.ConfigurationProvider
import org.onap.dcae.collectors.veshv.config.api.model.CbsConfiguration
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.ServiceContext
import org.onap.dcae.collectors.veshv.utils.logging.Logger
import org.onap.dcae.collectors.veshv.utils.logging.onErrorLog
import org.onap.dcaegen2.services.sdk.model.streams.StreamType
import org.onap.dcaegen2.services.sdk.model.streams.dmaap.KafkaSink
import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.CbsClient
import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.CbsRequests
import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.streams.DataStreams
import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.streams.StreamFromGsonParser
import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.streams.StreamFromGsonParsers
import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.streams.StreamPredicates
import org.onap.dcaegen2.services.sdk.rest.services.model.logging.RequestDiagnosticContext
import reactor.core.publisher.Flux
import reactor.core.publisher.Mono
import reactor.retry.Jitter
import reactor.retry.Retry
import java.time.Duration
/**
* @author Jakub Dudycz <jakub.dudycz@nokia.com>
* @since May 2018
*/
internal class ConfigurationProviderImpl(private val cbsClientMono: Mono<CbsClient>,
private val firstRequestDelay: Duration,
private val requestInterval: Duration,
private val healthState: HealthState,
private val streamParser: StreamFromGsonParser<KafkaSink>,
retrySpec: Retry<Any>
) : ConfigurationProvider {
constructor(cbsClientMono: Mono<CbsClient>, params: CbsConfiguration) : this(
cbsClientMono,
params.firstRequestDelay,
params.requestInterval,
HealthState.INSTANCE,
StreamFromGsonParsers.kafkaSinkParser(),
Retry.any<Any>()
.retryMax(MAX_RETRIES)
.fixedBackoff(params.requestInterval)
.jitter(Jitter.random())
)
private val retry = retrySpec.doOnRetry {
logger.withWarn(ServiceContext::mdc) {
log("Exception from configuration provider client, retrying subscription", it.exception())
}
healthState.changeState(HealthDescription.RETRYING_FOR_DYNAMIC_CONFIGURATION)
}
override fun invoke(): Flux<Sequence<KafkaSink>> =
cbsClientMono
.doOnNext { logger.info(ServiceContext::mdc) { "CBS client successfully created" } }
.onErrorLog(logger, ServiceContext::mdc) { "Failed to retrieve CBS client" }
.retryWhen(retry)
.doFinally { logger.trace(ServiceContext::mdc) { "CBS client subscription finished" } }
.flatMapMany(::handleUpdates)
private fun handleUpdates(cbsClient: CbsClient): Flux<Sequence<KafkaSink>> = cbsClient
.updates(CbsRequests.getConfiguration(RequestDiagnosticContext.create()),
firstRequestDelay,
requestInterval)
.doOnNext { logger.info(ServiceContext::mdc) { "Received new configuration:\n$it" } }
.map(::createCollectorConfiguration)
.onErrorLog(logger, ServiceContext::mdc) { "Error while creating configuration" }
.retryWhen(retry)
private fun createCollectorConfiguration(configuration: JsonObject): Sequence<KafkaSink> =
try {
DataStreams.namedSinks(configuration)
.filter(StreamPredicates.streamOfType(StreamType.KAFKA))
.map(streamParser::unsafeParse)
.asSequence()
} catch (e: NullPointerException) {
throw ParsingException("Failed to parse configuration", e)
}
companion object {
private const val MAX_RETRIES = 5L
private val logger = Logger(ConfigurationProviderImpl::class)
}
}
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