| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| */ |
| package org.apache.cassandra.transport; |
| |
| |
| import io.netty.channel.ChannelHandler; |
| import io.netty.channel.ChannelHandlerContext; |
| import io.netty.channel.ChannelInboundHandlerAdapter; |
| import org.apache.cassandra.config.DatabaseDescriptor; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.net.InetAddress; |
| import java.net.InetSocketAddress; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.ConcurrentMap; |
| import java.util.concurrent.atomic.AtomicLong; |
| |
| |
| /** |
| * {@link ChannelInboundHandlerAdapter} implementation which allows to limit the number of concurrent |
| * connections to the Server. Be aware this <strong>MUST</strong> be shared between all child channels. |
| */ |
| @ChannelHandler.Sharable |
| final class ConnectionLimitHandler extends ChannelInboundHandlerAdapter |
| { |
| private static final Logger logger = LoggerFactory.getLogger(ConnectionLimitHandler.class); |
| private final ConcurrentMap<InetAddress, AtomicLong> connectionsPerClient = new ConcurrentHashMap<>(); |
| private final AtomicLong counter = new AtomicLong(0); |
| |
| @Override |
| public void channelActive(ChannelHandlerContext ctx) throws Exception |
| { |
| final long count = counter.incrementAndGet(); |
| long limit = DatabaseDescriptor.getNativeTransportMaxConcurrentConnections(); |
| // Setting the limit to -1 disables it. |
| if(limit < 0) |
| { |
| limit = Long.MAX_VALUE; |
| } |
| if (count > limit) |
| { |
| // The decrement will be done in channelClosed(...) |
| logger.warn("Exceeded maximum native connection limit of {} by using {} connections", limit, count); |
| ctx.close(); |
| } |
| else |
| { |
| long perIpLimit = DatabaseDescriptor.getNativeTransportMaxConcurrentConnectionsPerIp(); |
| if (perIpLimit > 0) |
| { |
| InetAddress address = ((InetSocketAddress) ctx.channel().remoteAddress()).getAddress(); |
| |
| AtomicLong perIpCount = connectionsPerClient.get(address); |
| if (perIpCount == null) |
| { |
| perIpCount = new AtomicLong(0); |
| |
| AtomicLong old = connectionsPerClient.putIfAbsent(address, perIpCount); |
| if (old != null) |
| { |
| perIpCount = old; |
| } |
| } |
| if (perIpCount.incrementAndGet() > perIpLimit) |
| { |
| // The decrement will be done in channelClosed(...) |
| logger.warn("Exceeded maximum native connection limit per ip of {} by using {} connections", perIpLimit, perIpCount); |
| ctx.close(); |
| return; |
| } |
| } |
| ctx.fireChannelActive(); |
| } |
| } |
| |
| @Override |
| public void channelInactive(ChannelHandlerContext ctx) throws Exception |
| { |
| counter.decrementAndGet(); |
| InetAddress address = ((InetSocketAddress) ctx.channel().remoteAddress()).getAddress(); |
| |
| AtomicLong count = connectionsPerClient.get(address); |
| if (count != null) |
| { |
| if (count.decrementAndGet() <= 0) |
| { |
| connectionsPerClient.remove(address); |
| } |
| } |
| ctx.fireChannelInactive(); |
| } |
| } |