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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.domain
import io.netty.buffer.ByteBuf
import io.netty.buffer.ByteBufAllocator
import org.onap.dcae.collectors.veshv.domain.exceptions.EmptyWireFrameException
import org.onap.dcae.collectors.veshv.domain.exceptions.InvalidWireFrameMarkerException
import org.onap.dcae.collectors.veshv.domain.exceptions.MissingWireFrameBytesException
/**
* @author Piotr Jaszczyk <piotr.jaszczyk@nokia.com>
* @since June 2018
*/
class WireFrameEncoder(val allocator: ByteBufAllocator) {
fun encode(frame: WireFrame): ByteBuf {
val bb = allocator.buffer(WireFrame.HEADER_SIZE + frame.payload.size())
bb.writeByte(WireFrame.MARKER_BYTE.toInt())
bb.writeByte(frame.majorVersion.toInt())
bb.writeByte(frame.minorVersion.toInt())
bb.writeInt(frame.payloadSize)
frame.payload.writeTo(bb)
return bb
}
}
/**
* @author Piotr Jaszczyk <piotr.jaszczyk@nokia.com>
* @since June 2018
*/
class WireFrameDecoder {
fun decodeFirst(byteBuf: ByteBuf): WireFrame {
verifyNotEmpty(byteBuf)
byteBuf.markReaderIndex()
verifyMarker(byteBuf)
verifyMinimumSize(byteBuf)
val majorVersion = byteBuf.readUnsignedByte()
val minorVersion = byteBuf.readUnsignedByte()
val payloadSize = verifyPayloadSize(byteBuf)
val payload = ByteData.readFrom(byteBuf, payloadSize)
return WireFrame(payload, majorVersion, minorVersion, payloadSize)
}
private fun verifyPayloadSize(byteBuf: ByteBuf): Int =
byteBuf.readInt().let { payloadSize ->
if (byteBuf.readableBytes() < payloadSize) {
byteBuf.resetReaderIndex()
throw MissingWireFrameBytesException("readable bytes < payload size")
} else {
payloadSize
}
}
private fun verifyMinimumSize(byteBuf: ByteBuf) {
if (byteBuf.readableBytes() < WireFrame.HEADER_SIZE) {
byteBuf.resetReaderIndex()
throw MissingWireFrameBytesException("readable bytes < header size")
}
}
private fun verifyMarker(byteBuf: ByteBuf) {
val mark = byteBuf.readUnsignedByte()
if (mark != WireFrame.MARKER_BYTE) {
byteBuf.resetReaderIndex()
throw InvalidWireFrameMarkerException(mark)
}
}
private fun verifyNotEmpty(byteBuf: ByteBuf) {
if (byteBuf.readableBytes() < 1) {
throw EmptyWireFrameException()
}
}
}
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