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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
import io.netty.buffer.ByteBuf
import org.onap.dcae.collectors.veshv.boundary.Collector
import org.onap.dcae.collectors.veshv.boundary.Metrics
import org.onap.dcae.collectors.veshv.domain.WireFrameMessage
import org.onap.dcae.collectors.veshv.domain.logging.ClientContextLogging.handleReactiveStreamError
import org.onap.dcae.collectors.veshv.impl.wire.WireChunkDecoder
import org.onap.dcae.collectors.veshv.domain.logging.ClientContext
import org.onap.dcae.collectors.veshv.model.ClientRejectionCause
import org.onap.dcae.collectors.veshv.model.ConsumedMessage
import org.onap.dcae.collectors.veshv.model.FailedToConsumeMessage
import org.onap.dcae.collectors.veshv.model.MessageDropCause.INVALID_MESSAGE
import org.onap.dcae.collectors.veshv.model.SuccessfullyConsumedMessage
import org.onap.dcae.collectors.veshv.domain.VesMessage
import org.onap.dcae.collectors.veshv.utils.arrow.doOnFailure
import org.onap.dcae.collectors.veshv.utils.arrow.doOnLeft
import org.onap.dcae.collectors.veshv.utils.logging.Logger
import org.onap.dcae.collectors.veshv.utils.logging.MessageEither
import org.onap.dcae.collectors.veshv.utils.logging.filterFailedWithLog
import reactor.core.publisher.Flux
import reactor.core.publisher.Mono
/**
* @author Piotr Jaszczyk <piotr.jaszczyk@nokia.com>
* @since May 2018
*/
internal class HvVesCollector(
private val clientContext: ClientContext,
private val wireChunkDecoder: WireChunkDecoder,
private val protobufDecoder: VesDecoder,
private val router: Router,
private val metrics: Metrics) : Collector {
override fun handleConnection(dataStream: Flux<ByteBuf>): Mono<Void> =
dataStream
.transform { decodeWireFrame(it) }
.transform(::filterInvalidWireFrame)
.transform(::decodeProtobufPayload)
.transform(::filterInvalidProtobufMessages)
.transform(::route)
.handleErrors()
.doFinally { releaseBuffersMemory() }
.then()
private fun decodeWireFrame(flux: Flux<ByteBuf>): Flux<WireFrameMessage> = flux
.doOnNext { metrics.notifyBytesReceived(it.readableBytes()) }
.concatMap(wireChunkDecoder::decode)
.doOnNext(metrics::notifyMessageReceived)
private fun filterInvalidWireFrame(flux: Flux<WireFrameMessage>): Flux<WireFrameMessage> = flux
.filterFailedWithLog {
MessageValidator
.validateFrameMessage(it)
.doOnLeft { metrics.notifyMessageDropped(INVALID_MESSAGE) }
}
private fun decodeProtobufPayload(flux: Flux<WireFrameMessage>): Flux<VesMessage> = flux
.flatMap { frame ->
protobufDecoder
.decode(frame)
.doOnFailure { metrics.notifyMessageDropped(INVALID_MESSAGE) }
.filterFailedWithLog(logger, clientContext::fullMdc,
{ "Ves event header decoded successfully" },
{ "Failed to decode ves event header, reason: ${it.message}" })
}
private fun filterInvalidProtobufMessages(flux: Flux<VesMessage>): Flux<VesMessage> = flux
.filterFailedWithLog {
MessageValidator
.validateProtobufMessage(it)
.doOnLeft { metrics.notifyMessageDropped(INVALID_MESSAGE) }
}
private fun route(flux: Flux<VesMessage>) = flux
.flatMap(router::route)
.doOnNext(this::updateSinkMetrics)
private fun updateSinkMetrics(consumedMessage: ConsumedMessage) {
when (consumedMessage) {
is SuccessfullyConsumedMessage ->
metrics.notifyMessageSent(consumedMessage.message)
is FailedToConsumeMessage ->
metrics.notifyMessageDropped(consumedMessage.cause)
}
}
private fun releaseBuffersMemory() = wireChunkDecoder.release()
.also { logger.debug { "Released buffer memory after handling message stream" } }
private fun <T> Flux<T>.handleErrors(): Flux<T> = onErrorResume {
metrics.notifyClientRejected(ClientRejectionCause.fromThrowable(it))
logger.handleReactiveStreamError(clientContext, it)
}
private fun <T> Flux<T>.filterFailedWithLog(predicate: (T) -> MessageEither): Flux<T> =
filterFailedWithLog(logger, clientContext::fullMdc, predicate)
companion object {
private val logger = Logger(HvVesCollector::class)
}
}
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