Examples of com.alibaba.otter.canal.parse.driver.mysql.packets.HeaderPacket

Package com.alibaba.otter.canal.parse.driver.mysql.packets

Examples of com.alibaba.otter.canal.parse.driver.mysql.packets.HeaderPacket

com.alibaba.otter.canal.parse.driver.mysql.packets.HeaderPacket

 Offset  Length     Description 0       3        Packet body length stored with the low byte first. 3       1        Packet sequence number. The sequence numbers are reset with each new command.  While the correct packet sequencing is ensured by the underlying transmission protocol, this field is used for the sanity checks of the application logic.

The Packet Header will not be shown in the descriptions of packets that follow this section. Think of it as always there. But logically, it "precedes the packet" rather than "is included in the packet".
@author fujohnwang

import com.alibaba.otter.canal.parse.driver.mysql.packets.HeaderPacket;


public abstract class PacketManager {


    public static HeaderPacket readHeader(SocketChannel ch, int len) throws IOException {
        HeaderPacket header = new HeaderPacket();
        header.fromBytes(readBytesAsBuffer(ch, len).array());
        return header;
    }

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    public static void write(SocketChannel ch, byte[] body) throws IOException {
        write(ch, body, (byte) 0);
    }


    public static void write(SocketChannel ch, byte[] body, byte packetSeqNumber) throws IOException {
        HeaderPacket header = new HeaderPacket();
        header.setPacketBodyLength(body.length);
        header.setPacketSequenceNumber(packetSeqNumber);
        write(ch, new ByteBuffer[] { ByteBuffer.wrap(header.toBytes()), ByteBuffer.wrap(body) });
    }

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public class ChannelBufferHelper {


    protected transient final Logger logger = LoggerFactory.getLogger(ChannelBufferHelper.class);


    public final HeaderPacket assembleHeaderPacket(ChannelBuffer buffer) {
        HeaderPacket header = new HeaderPacket();
        byte[] headerBytes = new byte[MSC.HEADER_PACKET_LENGTH];
        buffer.readBytes(headerBytes);
        header.fromBytes(headerBytes);
        return header;
    }

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        logger.debug("body packet: {}", body);
        return body;
    }


    public final ChannelBuffer createHeaderWithPacketNumberPlusOne(int bodyLength, byte packetNumber) {
        HeaderPacket header = new HeaderPacket();
        header.setPacketBodyLength(bodyLength);
        header.setPacketSequenceNumber((byte) (packetNumber + 1));
        return ChannelBuffers.wrappedBuffer(header.toBytes());
    }

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        header.setPacketSequenceNumber((byte) (packetNumber + 1));
        return ChannelBuffers.wrappedBuffer(header.toBytes());
    }


    public final ChannelBuffer createHeader(int bodyLength, byte packetNumber) {
        HeaderPacket header = new HeaderPacket();
        header.setPacketBodyLength(bodyLength);
        header.setPacketSequenceNumber(packetNumber);
        return ChannelBuffers.wrappedBuffer(header.toBytes());
    }

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            throw new IOException("EOF Packet is expected, but packet with field_count=" + eofBody[0] + " is found.");
        }
    }


    protected byte[] readNextPacket() throws IOException {
        HeaderPacket h = PacketManager.readHeader(channel, 4);
        return PacketManager.readBytes(channel, h.getPacketBodyLength());
    }

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        channel.socket().setReceiveBufferSize(receiveBufferSize);
        channel.socket().setSendBufferSize(sendBufferSize);
    }


    private void negotiate(SocketChannel channel) throws IOException {
        HeaderPacket header = PacketManager.readHeader(channel, 4);
        byte[] body = PacketManager.readBytes(channel, header.getPacketBodyLength());
        if (body[0] < 0) {// check field_count
            if (body[0] == -1) {
                ErrorPacket error = new ErrorPacket();
                error.fromBytes(body);
                throw new IOException("handshake exception:\n" + error.toString());
            } else if (body[0] == -2) {
                throw new IOException("Unexpected EOF packet at handshake phase.");
            } else {
                throw new IOException("unpexpected packet with field_count=" + body[0]);
            }
        }
        HandshakeInitializationPacket handshakePacket = new HandshakeInitializationPacket();
        handshakePacket.fromBytes(body);


        logger.info("handshake initialization packet received, prepare the client authentication packet to send");


        ClientAuthenticationPacket clientAuth = new ClientAuthenticationPacket();
        clientAuth.setCharsetNumber(charsetNumber);


        clientAuth.setUsername(username);
        clientAuth.setPassword(password);
        clientAuth.setServerCapabilities(handshakePacket.serverCapabilities);
        clientAuth.setDatabaseName(defaultSchema);
        clientAuth.setScrumbleBuff(joinAndCreateScrumbleBuff(handshakePacket));


        byte[] clientAuthPkgBody = clientAuth.toBytes();
        HeaderPacket h = new HeaderPacket();
        h.setPacketBodyLength(clientAuthPkgBody.length);
        h.setPacketSequenceNumber((byte) (header.getPacketSequenceNumber() + 1));


        PacketManager.write(channel,
            new ByteBuffer[] { ByteBuffer.wrap(h.toBytes()), ByteBuffer.wrap(clientAuthPkgBody) });
        logger.info("client authentication packet is sent out.");


        // check auth result
        header = null;
        header = PacketManager.readHeader(channel, 4);

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        if (password != null && password.length() > 0) {
            r323.seed = MySQLPasswordEncrypter.scramble323(password, new String(seed)).getBytes();
        }
        byte[] b323Body = r323.toBytes();


        HeaderPacket h323 = new HeaderPacket();
        h323.setPacketBodyLength(b323Body.length);
        h323.setPacketSequenceNumber((byte) (packetSequenceNumber + 1));


        PacketManager.write(channel, new ByteBuffer[] { ByteBuffer.wrap(h323.toBytes()), ByteBuffer.wrap(b323Body) });
        logger.info("client 323 authentication packet is sent out.");
        // check auth result
        HeaderPacket header = PacketManager.readHeader(channel, 4);
        byte[] body = PacketManager.readBytes(channel, header.getPacketBodyLength());
        assert body != null;
        switch (body[0]) {
            case 0:
                break;
            case -1:

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        binlogDumpCmd.binlogPosition = binlogPosition;
        binlogDumpCmd.slaveServerId = this.slaveId;
        byte[] cmdBody = binlogDumpCmd.toBytes();


        logger.info("COM_BINLOG_DUMP with position:{}", binlogDumpCmd);
        HeaderPacket binlogDumpHeader = new HeaderPacket();
        binlogDumpHeader.setPacketBodyLength(cmdBody.length);
        binlogDumpHeader.setPacketSequenceNumber((byte) 0x00);
        PacketManager.write(connector.getChannel(), new ByteBuffer[] { ByteBuffer.wrap(binlogDumpHeader.toBytes()),
                ByteBuffer.wrap(cmdBody) });
    }

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        channel.socket().setReceiveBufferSize(receiveBufferSize);
        channel.socket().setSendBufferSize(sendBufferSize);
    }


    private void negotiate(SocketChannel channel) throws IOException {
        HeaderPacket header = PacketManager.readHeader(channel, 4);
        byte[] body = PacketManager.readBytes(channel, header.getPacketBodyLength());
        if (body[0] < 0) {// check field_count
            if (body[0] == -1) {
                ErrorPacket error = new ErrorPacket();
                error.fromBytes(body);
                throw new IOException("handshake exception:\n" + error.toString());
            } else if (body[0] == -2) {
                throw new IOException("Unexpected EOF packet at handshake phase.");
            } else {
                throw new IOException("unpexpected packet with field_count=" + body[0]);
            }
        }
        HandshakeInitializationPacket handshakePacket = new HandshakeInitializationPacket();
        handshakePacket.fromBytes(body);


        logger.info("handshake initialization packet received, prepare the client authentication packet to send");


        ClientAuthenticationPacket clientAuth = new ClientAuthenticationPacket();
        clientAuth.setCharsetNumber(charsetNumber);


        clientAuth.setUsername(username);
        clientAuth.setPassword(password);
        clientAuth.setServerCapabilities(handshakePacket.serverCapabilities);
        clientAuth.setDatabaseName(defaultSchema);
        clientAuth.setScrumbleBuff(joinAndCreateScrumbleBuff(handshakePacket));


        byte[] clientAuthPkgBody = clientAuth.toBytes();
        HeaderPacket h = new HeaderPacket();
        h.setPacketBodyLength(clientAuthPkgBody.length);
        h.setPacketSequenceNumber((byte) (header.getPacketSequenceNumber() + 1));


        PacketManager.write(channel, new ByteBuffer[] { ByteBuffer.wrap(h.toBytes()),
                ByteBuffer.wrap(clientAuthPkgBody) });
        logger.info("client authentication packet is sent out.");


        // check auth result
        header = null;

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