2 * ============LICENSE_START=======================================================
3 * dcaegen2-collectors-veshv
4 * ================================================================================
5 * Copyright (C) 2018 NOKIA
6 * ================================================================================
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 * ============LICENSE_END=========================================================
20 package org.onap.dcae.collectors.veshv.impl.wire
22 import arrow.effects.IO
23 import io.netty.buffer.ByteBuf
24 import io.netty.buffer.ByteBufAllocator
25 import org.onap.dcae.collectors.veshv.domain.WireFrameMessage
26 import org.onap.dcae.collectors.veshv.domain.WireFrameDecoder
27 import org.onap.dcae.collectors.veshv.domain.InvalidWireFrame
28 import org.onap.dcae.collectors.veshv.domain.WireFrameDecodingError
29 import org.onap.dcae.collectors.veshv.domain.MissingWireFrameBytes
30 import org.onap.dcae.collectors.veshv.utils.logging.Logger
31 import reactor.core.publisher.Flux
32 import reactor.core.publisher.SynchronousSink
35 * @author Piotr Jaszczyk <piotr.jaszczyk@nokia.com>
38 internal class WireChunkDecoder(
39 private val decoder: WireFrameDecoder,
40 alloc: ByteBufAllocator = ByteBufAllocator.DEFAULT) {
41 private val streamBuffer = alloc.compositeBuffer()
44 streamBuffer.release()
47 fun decode(byteBuf: ByteBuf): Flux<WireFrameMessage> = Flux.defer {
48 logIncomingMessage(byteBuf)
49 if (byteBuf.readableBytes() == 0) {
53 streamBuffer.addComponent(true, byteBuf)
54 generateFrames().doOnTerminate { streamBuffer.discardReadComponents() }
58 private fun generateFrames(): Flux<WireFrameMessage> = Flux.generate { next ->
59 decoder.decodeFirst(streamBuffer)
60 .fold(onError(next), onSuccess(next))
64 private fun onError(next: SynchronousSink<WireFrameMessage>): (WireFrameDecodingError) -> IO<Unit> = { err ->
66 is InvalidWireFrame -> IO {
67 next.error(WireFrameException(err))
69 is MissingWireFrameBytes -> IO {
76 private fun onSuccess(next: SynchronousSink<WireFrameMessage>): (WireFrameMessage) -> IO<Unit> = { frame ->
78 logDecodedWireMessage(frame)
83 private fun logIncomingMessage(wire: ByteBuf) {
84 logger.trace { "Got message with total size of ${wire.readableBytes()} B" }
87 private fun logDecodedWireMessage(wire: WireFrameMessage) {
88 logger.trace { "Wire payload size: ${wire.payloadSize} B" }
91 private fun logEndOfData() {
92 logger.trace { "End of data in current TCP buffer" }
96 val logger = Logger(WireChunkDecoder::class)