sources/hv-collector-core/src/main/kotlin/org/onap/dcae/collectors/veshv/impl/socket/NettyTcpServer.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.impl.socket
  21
  22 import arrow.core.getOrElse
  23 import arrow.effects.IO
  24 import org.onap.dcae.collectors.veshv.boundary.CollectorProvider
  25 import org.onap.dcae.collectors.veshv.boundary.Server
  26 import org.onap.dcae.collectors.veshv.model.ServerConfiguration
  27 import org.onap.dcae.collectors.veshv.ssl.boundary.ServerSslContextFactory
  28 import org.onap.dcae.collectors.veshv.utils.NettyServerHandle
  29 import org.onap.dcae.collectors.veshv.utils.ServerHandle
  30 import org.onap.dcae.collectors.veshv.utils.logging.Logger
  31 import reactor.core.publisher.Mono
  32 import reactor.netty.ByteBufFlux
  33 import reactor.netty.Connection
  34 import reactor.netty.NettyInbound
  35 import reactor.netty.NettyOutbound
  36 import reactor.netty.tcp.TcpServer
  37 import java.time.Duration
  38
  39 /**
  40  * @author Piotr Jaszczyk <piotr.jaszczyk@nokia.com>
  41  * @since May 2018
  42  */
  43 internal class NettyTcpServer(private val serverConfig: ServerConfiguration,
  44                               private val sslContextFactory: ServerSslContextFactory,
  45                               private val collectorProvider: CollectorProvider) : Server {
  46
  47     override fun start(): IO<ServerHandle> = IO {
  48         val tcpServer = TcpServer.create()
  49                 .addressSupplier { serverConfig.serverListenAddress }
  50                 .configureSsl()
  51                 .handle(this::handleConnection)
  52
  53         NettyServerHandle(tcpServer.bindNow())
  54     }
  55
  56     private fun TcpServer.configureSsl() =
  57             sslContextFactory
  58                     .createSslContext(serverConfig.securityConfiguration)
  59                     .map { sslContext ->
  60                         logger.info("Collector configured with SSL enabled")
  61                         this.secure { b -> b.sslContext(sslContext) }
  62                     }.getOrElse {
  63                         logger.info("Collector configured with SSL disabled")
  64                         this
  65                     }
  66
  67     private fun handleConnection(nettyInbound: NettyInbound, nettyOutbound: NettyOutbound): Mono<Void> =
  68             collectorProvider().fold(
  69                     {
  70                         nettyInbound.withConnection { conn ->
  71                             logger.warn { "Collector not ready. Closing connection from ${conn.address()}..." }
  72                         }
  73                         Mono.empty()
  74                     },
  75                     {
  76                         nettyInbound.withConnection { conn ->
  77                             logger.info { "Handling connection from ${conn.address()}" }
  78                             conn.configureIdleTimeout(serverConfig.idleTimeout)
  79                                     .logConnectionClosed()
  80                         }
  81                         it.handleConnection(nettyOutbound.alloc(), createDataStream(nettyInbound))
  82                     }
  83             )
  84
  85     private fun createDataStream(nettyInbound: NettyInbound): ByteBufFlux = nettyInbound
  86             .receive()
  87             .retain()
  88
  89     private fun Connection.configureIdleTimeout(timeout: Duration): Connection {
  90         onReadIdle(timeout.toMillis()) {
  91             logger.info {
  92                 "Idle timeout of ${timeout.seconds} s reached. Closing connection from ${address()}..."
  93             }
  94             disconnectClient()
  95         }
  96         return this
  97     }
  98
  99     private fun Connection.disconnectClient() {
 100         channel().close().addListener {
 101             if (it.isSuccess)
 102                 logger.debug { "Channel (${address()}) closed successfully." }
 103             else
 104                 logger.warn("Channel close failed", it.cause())
 105         }
 106     }
 107
 108     private fun Connection.logConnectionClosed(): Connection {
 109         onTerminate().subscribe {
 110             logger.info("Connection from ${address()} has been closed")
 111         }
 112         return this
 113     }
 114
 115     companion object {
 116         private val logger = Logger(NettyTcpServer::class)
 117     }
 118 }