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/*
* ============LICENSE_START=======================================================
* dcaegen2-collectors-veshv
* ================================================================================
* Copyright (C) 2018-2019 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.impl
import arrow.core.Option
import arrow.core.getOrElse
import io.netty.handler.ssl.SslContext
import org.onap.dcae.collectors.veshv.api.Server
import org.onap.dcae.collectors.veshv.boundary.Collector
import org.onap.dcae.collectors.veshv.boundary.CollectorFactory
import org.onap.dcae.collectors.veshv.boundary.Metrics
import org.onap.dcae.collectors.veshv.config.api.model.ServerConfiguration
import org.onap.dcae.collectors.veshv.domain.logging.ClientContext
import org.onap.dcae.collectors.veshv.domain.logging.ServiceContext
import org.onap.dcae.collectors.veshv.utils.NettyServerHandle
import org.onap.dcae.collectors.veshv.utils.ServerHandle
import org.onap.dcae.collectors.veshv.utils.logging.Logger
import org.onap.dcae.collectors.veshv.domain.logging.Marker
import org.onap.dcae.collectors.veshv.domain.logging.MarkerLogging.debug
import org.onap.dcae.collectors.veshv.domain.logging.MarkerLogging.info
import org.onap.dcae.collectors.veshv.domain.logging.MarkerLogging.warn
import org.onap.dcae.collectors.veshv.domain.logging.ClientContextLogging.debug
import org.onap.dcae.collectors.veshv.domain.logging.ClientContextLogging.info
import reactor.core.publisher.Mono
import reactor.netty.Connection
import reactor.netty.NettyInbound
import reactor.netty.NettyOutbound
import reactor.netty.tcp.TcpServer
import java.net.InetAddress
import java.net.InetSocketAddress
import java.time.Duration
/**
* @author Piotr Jaszczyk <piotr.jaszczyk@nokia.com>
* @since May 2018
*/
internal class NettyTcpServer(private val serverConfiguration: ServerConfiguration,
private val sslContext: Option<SslContext>,
private val collectorFactory: CollectorFactory,
private val metrics: Metrics) : Server {
override fun start(): Mono<ServerHandle> =
Mono.defer {
TcpServer.create()
.addressSupplier { InetSocketAddress(serverConfiguration.listenPort) }
.configureSsl()
.handle(this::handleConnection)
.bind()
.map {
NettyServerHandle(it, closeAction())
}
}
private fun closeAction(): Mono<Void> =
collectorFactory.close().doOnSuccess {
logger.info(ServiceContext::mdc) { "Netty TCP Server closed" }
}
private fun TcpServer.configureSsl() =
sslContext
.map { serverContext ->
logger.info { "Collector configured with SSL enabled" }
this.secure { it.sslContext(serverContext) }
}.getOrElse {
logger.info { "Collector configured with SSL disabled" }
this
}
private fun handleConnection(nettyInbound: NettyInbound, nettyOutbound: NettyOutbound): Mono<Void> =
messageHandlingStream(nettyInbound, nettyOutbound).run {
subscribe()
nettyOutbound.neverComplete()
}
private fun messageHandlingStream(nettyInbound: NettyInbound, nettyOutbound: NettyOutbound): Mono<Void> =
withNewClientContextFrom(nettyInbound, nettyOutbound)
{ clientContext ->
logger.debug(clientContext::fullMdc) { "Client connection request received" }
clientContext.clientAddress
.map { acceptIfNotLocalConnection(it, clientContext, nettyInbound) }
.getOrElse {
logger.warn(clientContext::fullMdc) {
"Client address could not be resolved. Discarding connection"
}
nettyInbound.closeConnectionAndReturn(Mono.empty())
}
}
private fun acceptIfNotLocalConnection(address: InetAddress,
clientContext: ClientContext,
nettyInbound: NettyInbound): Mono<Void> =
if (address.isLocalClientAddress()) {
logger.debug(clientContext) {
"Client address resolved to localhost. Discarding connection as suspected healthcheck"
}
nettyInbound.closeConnectionAndReturn(Mono.empty<Void>())
} else {
acceptClientConnection(clientContext, nettyInbound)
}
private fun acceptClientConnection(clientContext: ClientContext, nettyInbound: NettyInbound): Mono<Void> {
metrics.notifyClientConnected()
logger.info(clientContext::fullMdc, Marker.Entry) { "Handling new client connection" }
val collector = collectorFactory(clientContext)
return collector.handleClient(clientContext, nettyInbound)
}
private fun Collector.handleClient(clientContext: ClientContext,
nettyInbound: NettyInbound) =
withConnectionFrom(nettyInbound) { connection ->
connection
.configureIdleTimeout(clientContext, serverConfiguration.idleTimeout)
.logConnectionClosed(clientContext)
}.run {
handleConnection(nettyInbound.createDataStream())
}
private fun Connection.configureIdleTimeout(ctx: ClientContext, timeout: Duration): Connection =
onReadIdle(timeout.toMillis()) {
logger.info(ctx) {
"Idle timeout of ${timeout.seconds} s reached. Closing connection from ${address()}..."
}
disconnectClient(ctx)
}
private fun Connection.disconnectClient(ctx: ClientContext) =
closeChannelAndThen {
if (it.isSuccess)
logger.debug(ctx::fullMdc, Marker.Exit) { "Channel closed successfully." }
else
logger.warn(ctx::fullMdc, Marker.Exit, { "Channel close failed" }, it.cause())
}
private fun Connection.logConnectionClosed(ctx: ClientContext): Connection =
onDispose {
metrics.notifyClientDisconnected()
logger.info(ctx::fullMdc, Marker.Exit) { "Connection has been closed" }
}
companion object {
private val logger = Logger(NettyTcpServer::class)
}
}
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