herddb.network.netty.NettyConnector.java Source code

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Here is the source code for herddb.network.netty.NettyConnector.java

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/*
 Licensed to Diennea S.r.l. under one
 or more contributor license agreements. See the NOTICE file
 distributed with this work for additional information
 regarding copyright ownership. Diennea S.r.l. 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 herddb.network.netty;

import herddb.network.ChannelEventListener;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.DefaultEventLoopGroup;
import io.netty.channel.MultithreadEventLoopGroup;
import io.netty.channel.epoll.EpollEventLoopGroup;
import io.netty.channel.epoll.EpollSocketChannel;
import io.netty.channel.local.LocalAddress;
import io.netty.channel.local.LocalChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.LengthFieldBasedFrameDecoder;
import io.netty.handler.codec.LengthFieldPrepender;
import io.netty.handler.ssl.SslContext;
import io.netty.handler.ssl.SslContextBuilder;
import io.netty.handler.ssl.util.InsecureTrustManagerFactory;
import io.netty.handler.timeout.ReadTimeoutHandler;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.util.concurrent.ExecutorService;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.concurrent.atomic.AtomicReference;

/**
 * Worker-side connector
 *
 * @author enrico.olivelli
 */
public class NettyConnector {

    private static final Logger LOGGER = Logger.getLogger(NettyConnector.class.getName());

    public static NettyChannel connect(String host, int port, boolean ssl, int connectTimeout, int socketTimeout,
            ChannelEventListener receiver, final ExecutorService callbackExecutor,
            final MultithreadEventLoopGroup networkGroup, final DefaultEventLoopGroup localEventsGroup)
            throws IOException {
        try {
            final SslContext sslCtx = !ssl ? null
                    : SslContextBuilder.forClient().trustManager(InsecureTrustManagerFactory.INSTANCE).build();

            Class<? extends Channel> channelType;

            InetSocketAddress inet = new InetSocketAddress(host, port);
            SocketAddress address;
            String hostAddress = NetworkUtils.getAddress(inet);

            MultithreadEventLoopGroup group;
            if (LocalServerRegistry.isLocalServer(hostAddress, port, ssl)) {
                channelType = LocalChannel.class;
                address = new LocalAddress(hostAddress + ":" + port + ":" + ssl);
                group = localEventsGroup;
            } else {
                channelType = networkGroup instanceof EpollEventLoopGroup ? EpollSocketChannel.class
                        : NioSocketChannel.class;
                address = inet;
                group = networkGroup;
            }
            Bootstrap b = new Bootstrap();
            AtomicReference<NettyChannel> result = new AtomicReference<>();

            b.group(group).channel(channelType).option(ChannelOption.CONNECT_TIMEOUT_MILLIS, connectTimeout)
                    .handler(new ChannelInitializer<Channel>() {
                        @Override
                        public void initChannel(Channel ch) throws Exception {
                            try {
                                NettyChannel channel = new NettyChannel(host + ":" + port, ch, callbackExecutor);
                                result.set(channel);
                                channel.setMessagesReceiver(receiver);
                                if (ssl) {
                                    ch.pipeline().addLast(sslCtx.newHandler(ch.alloc(), host, port));
                                }
                                if (socketTimeout > 0) {
                                    ch.pipeline().addLast("readTimeoutHandler",
                                            new ReadTimeoutHandler(socketTimeout));
                                }
                                ch.pipeline().addLast("lengthprepender", new LengthFieldPrepender(4));
                                ch.pipeline().addLast("lengthbaseddecoder",
                                        new LengthFieldBasedFrameDecoder(Integer.MAX_VALUE, 0, 4, 0, 4));
                                //
                                ch.pipeline().addLast("messagedecoder", new ProtocolMessageDecoder());
                                ch.pipeline().addLast(new ClientInboundMessageHandler(channel));
                            } catch (Throwable t) {
                                LOGGER.log(Level.SEVERE, "error connecting", t);
                                ch.close();
                            }
                        }
                    });

            LOGGER.log(Level.FINE, "connecting to {0}:{1} ssl={2} address={3}",
                    new Object[] { host, port, ssl, address });
            b.connect(address).sync();
            NettyChannel nettyChannel = result.get();
            if (!nettyChannel.isValid()) {
                throw new IOException("returned channel is not valid");
            }
            return nettyChannel;
        } catch (InterruptedException ex) {
            throw new IOException(ex);
        }

    }

}