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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
import arrow.core.Option
import io.netty.buffer.ByteBuf
import io.netty.buffer.ByteBufAllocator
import org.onap.dcae.collectors.veshv.boundary.Collector
import org.onap.dcae.collectors.veshv.boundary.Metrics
import org.onap.dcae.collectors.veshv.boundary.Sink
import org.onap.dcae.collectors.veshv.domain.WireFrameMessage
import org.onap.dcae.collectors.veshv.impl.wire.WireChunkDecoder
import org.onap.dcae.collectors.veshv.model.RoutedMessage
import org.onap.dcae.collectors.veshv.model.VesMessage
import org.onap.dcae.collectors.veshv.utils.logging.Logger
import org.onap.dcae.collectors.veshv.utils.logging.handleReactiveStreamError
import reactor.core.publisher.Flux
import reactor.core.publisher.Mono
/**
* @author Piotr Jaszczyk <piotr.jaszczyk@nokia.com>
* @since May 2018
*/
internal class VesHvCollector(
private val wireChunkDecoderSupplier: (ByteBufAllocator) -> WireChunkDecoder,
private val protobufDecoder: VesDecoder,
private val router: Router,
private val sink: Sink,
private val metrics: Metrics) : Collector {
override fun handleConnection(alloc: ByteBufAllocator, dataStream: Flux<ByteBuf>): Mono<Void> =
wireChunkDecoderSupplier(alloc).let { wireDecoder ->
dataStream
.transform { decodeWireFrame(it, wireDecoder) }
.filter(WireFrameMessage::isValid)
.transform(::decodePayload)
.filter(VesMessage::isValid)
.transform(::routeMessage)
.onErrorResume { logger.handleReactiveStreamError(it) }
.doFinally { releaseBuffersMemory(wireDecoder) }
.then()
}
private fun decodeWireFrame(flux: Flux<ByteBuf>, decoder: WireChunkDecoder): Flux<WireFrameMessage> = flux
.doOnNext { metrics.notifyBytesReceived(it.readableBytes()) }
.concatMap(decoder::decode)
.doOnNext { metrics.notifyMessageReceived(it.payloadSize) }
private fun decodePayload(flux: Flux<WireFrameMessage>): Flux<VesMessage> = flux
.map(WireFrameMessage::payload)
.map(protobufDecoder::decode)
.flatMap { omitWhenNone(it) }
private fun routeMessage(flux: Flux<VesMessage>): Flux<RoutedMessage> = flux
.flatMap(this::findRoute)
.compose(sink::send)
.doOnNext { metrics.notifyMessageSent(it.topic) }
private fun findRoute(msg: VesMessage): Mono<RoutedMessage> = omitWhenNone((router::findDestination)(msg))
private fun <V> omitWhenNone(it: Option<V>): Mono<V> = it.fold(
{ Mono.empty() },
{ Mono.just(it) })
private fun releaseBuffersMemory(wireChunkDecoder: WireChunkDecoder) = wireChunkDecoder.release()
companion object {
private val logger = Logger(VesHvCollector::class)
}
}
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