/*
 * Copyright (c) 2013, OpenCloudDB/MyCAT and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software;Designed and Developed mainly by many Chinese 
 * opensource volunteers. you can redistribute it and/or modify it under the 
 * terms of the GNU General Public License version 2 only, as published by the
 * Free Software Foundation.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 * 
 * Any questions about this component can be directed to it's project Web address 
 * https://code.google.com/p/opencloudb/.
 *
 */
package org.opencloudb.heartbeat;

import org.opencloudb.mysql.CharsetUtil;
import org.opencloudb.net.NIOHandler;
import org.opencloudb.net.mysql.ErrorPacket;
import org.opencloudb.net.mysql.HandshakePacket;
import org.opencloudb.net.mysql.OkPacket;

/**
 * @author mycat
 */
public class MyCATDetectorAuthenticator implements NIOHandler {

    private final MyCATDetector source;

    public MyCATDetectorAuthenticator(MyCATDetector source) {
        this.source = source;
    }

    @Override
    public void handle(byte[] data) {
        MyCATDetector source = this.source;
        HandshakePacket hsp = source.getHandshake();
        if (hsp == null) {
            // 设置握手数据包
            hsp = new HandshakePacket();
            hsp.read(data);
            source.setHandshake(hsp);

            // 设置字符集编码
            int charsetIndex = (hsp.serverCharsetIndex & 0xff);
            String charset = CharsetUtil.getCharset(charsetIndex);
            if (charset != null) {
                source.setCharsetIndex(charsetIndex);
            } else {
                throw new RuntimeException("Unknown charsetIndex:" + charsetIndex);
            }

            // 发送认证数据包
            source.authenticate();
        } else { // 处理认证结果
            switch (data[4]) {
            case OkPacket.FIELD_COUNT:
                source.setHandler(new MyCATDetectorHandler(source));
                source.setAuthenticated(true);
                source.heartbeat();// 认证成功后，发起心跳。
                break;
            case ErrorPacket.FIELD_COUNT:
                ErrorPacket err = new ErrorPacket();
                err.read(data);
                throw new RuntimeException(new String(err.message));
            default:
                throw new RuntimeException("Unknown packet");
            }
        }
    }

}