1 files changed, 114 insertions, 0 deletions
diff --git a/sources/hv-collector-core/src/main/kotlin/org/onap/dcae/collectors/veshv/impl/socket/NettyTcpServer.kt b/sources/hv-collector-core/src/main/kotlin/org/onap/dcae/collectors/veshv/impl/socket/NettyTcpServer.kt
new file mode 100644
index 00000000..e535300a
--- /dev/null
+++ b/sources/hv-collector-core/src/main/kotlin/org/onap/dcae/collectors/veshv/impl/socket/NettyTcpServer.kt
@@ -0,0 +1,114 @@
+/*
+ * ============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.getOrElse
+import arrow.effects.IO
+import org.onap.dcae.collectors.veshv.boundary.CollectorProvider
+import org.onap.dcae.collectors.veshv.boundary.Server
+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 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.time.Duration
+
+/**
+ * @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) : Server {
+
+    override fun start(): IO<ServerHandle> = IO {
+        val tcpServer = TcpServer.create()
+                .addressSupplier { serverConfig.serverListenAddress }
+                .configureSsl()
+                .handle(this::handleConnection)
+
+        NettyServerHandle(tcpServer.bindNow())
+    }
+
+    private fun TcpServer.configureSsl() =
+            sslContextFactory
+                    .createSslContext(serverConfig.securityConfiguration)
+                    .map { sslContext ->
+                        this.secure { b -> b.sslContext(sslContext) }
+                    }.getOrElse { this }
+
+    private fun handleConnection(nettyInbound: NettyInbound, nettyOutbound: NettyOutbound): Mono<Void> =
+            collectorProvider().fold(
+                    {
+                        nettyInbound.withConnection { conn ->
+                            logger.warn { "Collector not ready. Closing connection from ${conn.address()}..." }
+                        }
+                        Mono.empty()
+                    },
+                    {
+                        nettyInbound.withConnection { conn ->
+                            logger.info { "Handling connection from ${conn.address()}" }
+                            conn.configureIdleTimeout(serverConfig.idleTimeout)
+                                    .logConnectionClosed()
+                        }
+                        it.handleConnection(nettyOutbound.alloc(), createDataStream(nettyInbound))
+                    }
+            )
+
+    private fun createDataStream(nettyInbound: NettyInbound): ByteBufFlux = nettyInbound
+            .receive()
+            .retain()
+
+    private fun Connection.configureIdleTimeout(timeout: Duration): Connection {
+        onReadIdle(timeout.toMillis()) {
+            logger.info {
+                "Idle timeout of ${timeout.seconds} s reached. Closing connection from ${address()}..."
+            }
+            disconnectClient()
+        }
+        return this
+    }
+
+    private fun Connection.disconnectClient() {
+        channel().close().addListener {
+            if (it.isSuccess)
+                logger.debug { "Channel (${address()}) closed successfully." }
+            else
+                logger.warn("Channel close failed", it.cause())
+        }
+    }
+
+    private fun Connection.logConnectionClosed(): Connection {
+        onTerminate().subscribe {
+            logger.info("Connection from ${address()} has been closed")
+        }
+        return this
+    }
+
+    companion object {
+        private val logger = Logger(NettyTcpServer::class)
+    }
+}