hv-collector-ves-message-generator/src/main/kotlin/org/onap/dcae/collectors/veshv/ves/message/generator/impl/MessageGeneratorImpl.kt

   1 /*
   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
  10  *
  11  *      http://www.apache.org/licenses/LICENSE-2.0
  12  *
  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=========================================================
  19  */
  20 package org.onap.dcae.collectors.veshv.ves.message.generator.impl
  21
  22 import com.google.protobuf.ByteString
  23 import org.onap.dcae.collectors.veshv.domain.ByteData
  24 import org.onap.dcae.collectors.veshv.domain.PayloadContentType
  25 import org.onap.dcae.collectors.veshv.domain.WireFrameMessage
  26 import org.onap.dcae.collectors.veshv.ves.message.generator.api.MessageGenerator
  27 import org.onap.dcae.collectors.veshv.ves.message.generator.api.MessageParameters
  28 import org.onap.dcae.collectors.veshv.ves.message.generator.api.MessageType
  29 import org.onap.dcae.collectors.veshv.ves.message.generator.api.MessageType.FIXED_PAYLOAD
  30 import org.onap.dcae.collectors.veshv.ves.message.generator.api.MessageType.INVALID_GPB_DATA
  31 import org.onap.dcae.collectors.veshv.ves.message.generator.api.MessageType.INVALID_WIRE_FRAME
  32 import org.onap.dcae.collectors.veshv.ves.message.generator.api.MessageType.TOO_BIG_PAYLOAD
  33 import org.onap.dcae.collectors.veshv.ves.message.generator.api.MessageType.VALID
  34 import org.onap.ves.VesEventOuterClass.CommonEventHeader
  35 import org.onap.ves.VesEventOuterClass.VesEvent
  36 import reactor.core.publisher.Flux
  37 import reactor.core.publisher.Mono
  38 import java.nio.charset.Charset
  39
  40 /**
  41  * @author Jakub Dudycz <jakub.dudycz@nokia.com>
  42  * @since June 2018
  43  */
  44 class MessageGeneratorImpl internal constructor(
  45         private val payloadGenerator: PayloadGenerator,
  46         private val maxPayloadSizeBytes: Int
  47 ) : MessageGenerator {
  48
  49     override fun createMessageFlux(messageParameters: List<MessageParameters>): Flux<WireFrameMessage> = Flux
  50             .fromIterable(messageParameters)
  51             .flatMap { createMessageFlux(it) }
  52
  53     private fun createMessageFlux(parameters: MessageParameters): Flux<WireFrameMessage> =
  54             Mono.fromCallable { createMessage(parameters.commonEventHeader, parameters.messageType) }
  55                     .let {
  56                         when {
  57                             parameters.amount < 0 ->
  58                                 // repeat forever
  59                                 it.repeat()
  60                             parameters.amount == 0L ->
  61                                 // do not generate any message
  62                                 Flux.empty()
  63                             else ->
  64                                 // send original message and additional amount-1 messages
  65                                 it.repeat(parameters.amount - 1)
  66                         }
  67                     }
  68
  69     private fun createMessage(commonEventHeader: CommonEventHeader, messageType: MessageType): WireFrameMessage =
  70             when (messageType) {
  71                 VALID ->
  72                     WireFrameMessage(vesEvent(commonEventHeader, payloadGenerator.generatePayload()))
  73                 TOO_BIG_PAYLOAD ->
  74                     WireFrameMessage(vesEvent(commonEventHeader, oversizedPayload()))
  75                 FIXED_PAYLOAD ->
  76                     WireFrameMessage(vesEvent(commonEventHeader, fixedPayload()))
  77                 INVALID_WIRE_FRAME -> {
  78                     val payload = ByteData(vesEvent(commonEventHeader, payloadGenerator.generatePayload()))
  79                     WireFrameMessage(
  80                             payload,
  81                             UNSUPPORTED_VERSION,
  82                             UNSUPPORTED_VERSION,
  83                             PayloadContentType.GOOGLE_PROTOCOL_BUFFER.hexValue,
  84                             payload.size())
  85                 }
  86                 INVALID_GPB_DATA ->
  87                     WireFrameMessage("invalid vesEvent".toByteArray(Charset.defaultCharset()))
  88             }
  89
  90     private fun vesEvent(commonEventHeader: CommonEventHeader, eventFields: ByteString): ByteArray {
  91         return createVesEvent(commonEventHeader, eventFields).toByteArray()
  92     }
  93
  94     private fun createVesEvent(commonEventHeader: CommonEventHeader, payload: ByteString): VesEvent =
  95             VesEvent.newBuilder()
  96                     .setCommonEventHeader(commonEventHeader)
  97                     .setEventFields(payload)
  98                     .build()
  99
 100     private fun oversizedPayload() =
 101             payloadGenerator.generateRawPayload(maxPayloadSizeBytes + 1)
 102
 103     private fun fixedPayload() =
 104             payloadGenerator.generateRawPayload(MessageGenerator.FIXED_PAYLOAD_SIZE)
 105
 106     companion object {
 107         private const val UNSUPPORTED_VERSION: Short = 2
 108     }
 109 }