hv-collector-xnf-simulator/src/main/kotlin/org/onap/dcae/collectors/veshv/simulators/xnf/impl/adapters/VesHvClient.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.simulators.xnf.impl.adapters
  21
  22 import arrow.core.Option
  23 import arrow.core.getOrElse
  24 import io.netty.handler.ssl.SslContext
  25 import org.onap.dcae.collectors.veshv.domain.WireFrameMessage
  26 import org.onap.dcae.collectors.veshv.domain.SecurityConfiguration
  27 import org.onap.dcae.collectors.veshv.domain.WireFrameEncoder
  28 import org.onap.dcae.collectors.veshv.simulators.xnf.impl.config.SimulatorConfiguration
  29 import org.onap.dcae.collectors.veshv.ssl.boundary.ClientSslContextFactory
  30 import org.onap.dcae.collectors.veshv.utils.arrow.asIo
  31 import org.onap.dcae.collectors.veshv.utils.logging.Logger
  32 import org.reactivestreams.Publisher
  33 import reactor.core.publisher.Flux
  34 import reactor.core.publisher.Mono
  35 import reactor.core.publisher.ReplayProcessor
  36 import reactor.netty.NettyOutbound
  37 import reactor.netty.tcp.TcpClient
  38
  39 /**
  40  * @author Jakub Dudycz <jakub.dudycz@nokia.com>
  41  * @since June 2018
  42  */
  43 class VesHvClient(private val configuration: SimulatorConfiguration) {
  44
  45     private val client: TcpClient = TcpClient.create()
  46             .host(configuration.vesHost)
  47             .port(configuration.vesPort)
  48             .configureSsl()
  49
  50     private fun TcpClient.configureSsl() =
  51             createSslContext(configuration.security)
  52                     .map { sslContext -> this.secure(sslContext) }
  53                     .getOrElse { this }
  54
  55     fun sendIo(messages: Flux<WireFrameMessage>) =
  56             sendRx(messages).then(Mono.just(Unit)).asIo()
  57
  58     private fun sendRx(messages: Flux<WireFrameMessage>): Mono<Void> {
  59         val complete = ReplayProcessor.create<Void>(1)
  60         client
  61                 .handle { _, output -> handler(complete, messages, output) }
  62                 .connect()
  63                 .doOnError {
  64                     logger.info("Failed to connect to VesHvCollector on " +
  65                             "${configuration.vesHost}:${configuration.vesPort}")
  66                 }
  67                 .subscribe {
  68                     logger.info("Connected to VesHvCollector on " +
  69                             "${configuration.vesHost}:${configuration.vesPort}")
  70                 }
  71         return complete.then()
  72     }
  73
  74     private fun handler(complete: ReplayProcessor<Void>,
  75                         messages: Flux<WireFrameMessage>,
  76                         nettyOutbound: NettyOutbound): Publisher<Void> {
  77
  78         val allocator = nettyOutbound.alloc()
  79         val encoder = WireFrameEncoder(allocator)
  80         val frames = messages
  81                 .map(encoder::encode)
  82                 .window(MAX_BATCH_SIZE)
  83
  84         return nettyOutbound
  85                 .logConnectionClosed()
  86                 .options { it.flushOnBoundary() }
  87                 .sendGroups(frames)
  88                 .then {
  89                     logger.info("Messages have been sent")
  90                     complete.onComplete()
  91                 }
  92                 .then()
  93     }
  94
  95     private fun createSslContext(config: SecurityConfiguration): Option<SslContext> =
  96             ClientSslContextFactory().createSslContext(config)
  97
  98     private fun NettyOutbound.logConnectionClosed() =
  99             withConnection { conn ->
 100                 conn.onTerminate().subscribe {
 101                     logger.info { "Connection to ${conn.address()} has been closed" }
 102                 }
 103             }
 104
 105     companion object {
 106         private val logger = Logger(VesHvClient::class)
 107         private const val MAX_BATCH_SIZE = 128
 108     }
 109 }