org.l2junity.gameserver.network.telnet.TelnetServer.java Source code

Introduction

Here is the source code for org.l2junity.gameserver.network.telnet.TelnetServer.java

Source

/*
 * Copyright (C) 2004-2015 L2J Unity
 * 
 * This file is part of L2J Unity.
 * 
 * L2J Unity is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * L2J Unity is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
package org.l2junity.gameserver.network.telnet;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;

import java.net.InetSocketAddress;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.Map;

import org.l2junity.Config;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author UnAfraid
 */
public class TelnetServer {
    private static final Logger LOGGER = LoggerFactory.getLogger(TelnetServer.class);
    private final Map<String, ITelnetCommand> _commands = new LinkedHashMap<>();
    private final EventLoopGroup _workerGroup = new NioEventLoopGroup(1);

    protected TelnetServer() {
        if (Config.TELNET_ENABLED) {
            init();
        } else {
            LOGGER.info("Telnet server is currently disabled.");
        }
    }

    public void init() {
        addHandler(new ITelnetCommand() {
            @Override
            public String getCommand() {
                return "help";
            }

            @Override
            public String getUsage() {
                return "help [command]";
            }

            @Override
            public String handle(ChannelHandlerContext ctx, String[] args) {
                if (args.length == 0) {
                    final StringBuilder sb = new StringBuilder("Available commands:" + System.lineSeparator());
                    for (ITelnetCommand cmd : TelnetServer.getInstance().getCommands()) {
                        sb.append(cmd.getCommand() + System.lineSeparator());
                    }
                    return sb.toString();
                }
                final ITelnetCommand cmd = TelnetServer.getInstance().getCommand(args[0]);
                if (cmd == null) {
                    return "Unknown command." + System.lineSeparator();
                }
                return "Usage:" + System.lineSeparator() + cmd.getUsage() + System.lineSeparator();
            }
        });

        try {
            final InetSocketAddress socket = Config.TELNET_HOSTNAME.equals("*")
                    ? new InetSocketAddress(Config.TELNET_PORT)
                    : new InetSocketAddress(Config.TELNET_HOSTNAME, Config.TELNET_PORT);
            //@formatter:off
            new ServerBootstrap().group(_workerGroup).channel(NioServerSocketChannel.class)
                    .option(ChannelOption.SO_KEEPALIVE, true).childHandler(new TelnetServerInitializer())
                    .bind(socket);
            //@formatter:on
            LOGGER.info("Listening on " + Config.TELNET_HOSTNAME + ":" + Config.TELNET_PORT);
        } catch (Exception e) {
            LOGGER.warn(e.getMessage(), e);
        }
    }

    public void addHandler(ITelnetCommand handler) {
        _commands.put(handler.getCommand(), handler);
    }

    public ITelnetCommand getCommand(String command) {
        return _commands.get(command);
    }

    public Collection<ITelnetCommand> getCommands() {
        return _commands.values();
    }

    public void shutdown() {
        _workerGroup.shutdownGracefully();
        LOGGER.info("Shutting down..");
    }

    public static TelnetServer getInstance() {
        return SingletonHolder._instance;
    }

    private static class SingletonHolder {
        protected static final TelnetServer _instance = new TelnetServer();
    }
}