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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.impl.socket
import arrow.core.None
import arrow.core.Option
import arrow.core.getOrElse
import arrow.effects.IO
import arrow.syntax.collections.firstOption
import io.netty.handler.ssl.SslHandler
import org.onap.dcae.collectors.veshv.boundary.CollectorProvider
import org.onap.dcae.collectors.veshv.boundary.Metrics
import org.onap.dcae.collectors.veshv.boundary.Server
import org.onap.dcae.collectors.veshv.impl.adapters.ClientContextLogging.debug
import org.onap.dcae.collectors.veshv.impl.adapters.ClientContextLogging.info
import org.onap.dcae.collectors.veshv.impl.adapters.ClientContextLogging.withWarn
import org.onap.dcae.collectors.veshv.model.ClientContext
import org.onap.dcae.collectors.veshv.model.ServerConfiguration
import org.onap.dcae.collectors.veshv.ssl.boundary.ServerSslContextFactory
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.utils.logging.Marker
import reactor.core.publisher.Mono
import reactor.netty.ByteBufFlux
import reactor.netty.Connection
import reactor.netty.NettyInbound
import reactor.netty.NettyOutbound
import reactor.netty.tcp.TcpServer
import java.security.cert.X509Certificate
import java.time.Duration
import javax.net.ssl.SSLSession
/**
* @author Piotr Jaszczyk <piotr.jaszczyk@nokia.com>
* @since May 2018
*/
internal class NettyTcpServer(private val serverConfig: ServerConfiguration,
private val sslContextFactory: ServerSslContextFactory,
private val collectorProvider: CollectorProvider,
private val metrics: Metrics) : Server {
override fun start(): IO<ServerHandle> = IO {
TcpServer.create()
.addressSupplier { serverConfig.serverListenAddress }
.configureSsl()
.handle(this::handleConnection)
.let { NettyServerHandle(it.bindNow()) }
}
private fun TcpServer.configureSsl() =
sslContextFactory
.createSslContext(serverConfig.securityConfiguration)
.map { sslContext ->
logger.info { "Collector configured with SSL enabled" }
this.secure { b -> b.sslContext(sslContext) }
}.getOrElse {
logger.info { "Collector configured with SSL disabled" }
this
}
private fun handleConnection(nettyInbound: NettyInbound, nettyOutbound: NettyOutbound): Mono<Void> {
metrics.notifyClientConnected()
val clientContext = ClientContext(nettyOutbound.alloc())
nettyInbound.withConnection {
populateClientContext(clientContext, it)
it.channel().pipeline().get(SslHandler::class.java)?.engine()?.session?.let { sslSession ->
sslSession.peerCertificates.firstOption().map { it as X509Certificate }.map { it.subjectDN.name }
}
}
logger.debug(clientContext::fullMdc, Marker.Entry) { "Client connection request received" }
return collectorProvider(clientContext).fold(
{
logger.warn(clientContext::fullMdc) { "Collector not ready. Closing connection..." }
Mono.empty()
},
{
logger.info(clientContext::fullMdc) { "Handling new connection" }
nettyInbound.withConnection { conn ->
conn
.configureIdleTimeout(clientContext, serverConfig.idleTimeout)
.logConnectionClosed(clientContext)
}
it.handleConnection(createDataStream(nettyInbound))
}
)
}
private fun populateClientContext(clientContext: ClientContext, connection: Connection) {
clientContext.clientAddress = try {
Option.fromNullable(connection.address().address)
} catch (ex: Exception) {
None
}
clientContext.clientCert = getSslSession(connection).flatMap(::findClientCert)
}
private fun getSslSession(connection: Connection) = Option.fromNullable(
connection
.channel()
.pipeline()
.get(SslHandler::class.java)
?.engine()
?.session)
private fun findClientCert(sslSession: SSLSession): Option<X509Certificate> =
sslSession
.peerCertificates
.firstOption()
.flatMap { Option.fromNullable(it as? X509Certificate) }
private fun createDataStream(nettyInbound: NettyInbound): ByteBufFlux = nettyInbound
.receive()
.retain()
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) {
channel().close().addListener {
logger.debug(ctx::fullMdc, Marker.Exit) { "Closing client channel." }
if (it.isSuccess)
logger.debug(ctx) { "Channel closed successfully." }
else
logger.withWarn(ctx) { log("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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