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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.wire
import io.netty.buffer.ByteBuf
import org.onap.dcae.collectors.veshv.domain.InvalidWireFrame
import org.onap.dcae.collectors.veshv.domain.MissingWireFrameBytes
import org.onap.dcae.collectors.veshv.domain.WireFrameDecoder
import org.onap.dcae.collectors.veshv.domain.WireFrameDecodingError
import org.onap.dcae.collectors.veshv.domain.WireFrameMessage
import org.onap.dcae.collectors.veshv.impl.adapters.ClientContextLogging.handleReactiveStreamError
import org.onap.dcae.collectors.veshv.impl.adapters.ClientContextLogging.trace
import org.onap.dcae.collectors.veshv.model.ClientContext
import org.onap.dcae.collectors.veshv.utils.logging.Logger
import reactor.core.publisher.Flux
import reactor.core.publisher.Flux.defer
import reactor.core.publisher.SynchronousSink
/**
* @author Piotr Jaszczyk <piotr.jaszczyk@nokia.com>
* @since May 2018
*/
internal class WireChunkDecoder(
private val decoder: WireFrameDecoder,
private val ctx: ClientContext) {
private val streamBuffer = ctx.alloc.compositeBuffer()
fun release() {
streamBuffer.release()
}
fun decode(byteBuf: ByteBuf): Flux<WireFrameMessage> = defer {
logIncomingMessage(byteBuf)
if (byteBuf.readableBytes() == 0) {
byteBuf.release()
Flux.empty()
} else {
streamBuffer.addComponent(true, byteBuf)
generateFrames()
.onErrorResume { logger.handleReactiveStreamError(ctx, it, Flux.error(it)) }
.doFinally { streamBuffer.discardReadComponents() }
}
}
private fun generateFrames(): Flux<WireFrameMessage> = Flux.generate { next ->
decoder.decodeFirst(streamBuffer)
.fold(onError(next), onSuccess(next))
}
private fun onError(next: SynchronousSink<WireFrameMessage>): (WireFrameDecodingError) -> Unit = { err ->
when (err) {
is InvalidWireFrame ->
next.error(WireFrameException(err))
is MissingWireFrameBytes -> {
logEndOfData()
next.complete()
}
}
}
private fun onSuccess(next: SynchronousSink<WireFrameMessage>): (WireFrameMessage) -> Unit = { frame ->
logDecodedWireMessage(frame)
next.next(frame)
}
private fun logIncomingMessage(wire: ByteBuf) {
logger.trace(ctx) { "Got message with total size of ${wire.readableBytes()} B" }
}
private fun logDecodedWireMessage(wire: WireFrameMessage) {
logger.trace(ctx) { "Wire payload size: ${wire.payloadSize} B" }
}
private fun logEndOfData() {
logger.trace(ctx) { "End of data in current TCP buffer" }
}
companion object {
val logger = Logger(WireChunkDecoder::class)
}
}
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