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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
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/*
 * 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.messages;

import java.util.HashMap;
import java.util.Map;

import io.netty.buffer.ByteBuf;

import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.service.ClientState;
import org.apache.cassandra.service.QueryState;
import org.apache.cassandra.transport.*;
import org.apache.cassandra.utils.CassandraVersion;

/**
 * The initial message of the protocol.
 * Sets up a number of connection options.
 */
public class StartupMessage extends Message.Request
{
    public static final String CQL_VERSION = "CQL_VERSION";
    public static final String COMPRESSION = "COMPRESSION";
    public static final String PROTOCOL_VERSIONS = "PROTOCOL_VERSIONS";
    public static final String DRIVER_NAME = "DRIVER_NAME";
    public static final String DRIVER_VERSION = "DRIVER_VERSION";
    public static final String THROW_ON_OVERLOAD = "THROW_ON_OVERLOAD";

    public static final Message.Codec codec = new Message.Codec()
    {
        public StartupMessage decode(ByteBuf body, ProtocolVersion version)
        {
            return new StartupMessage(upperCaseKeys(CBUtil.readStringMap(body)));
        }

        public void encode(StartupMessage msg, ByteBuf dest, ProtocolVersion version)
        {
            CBUtil.writeStringMap(msg.options, dest);
        }

        public int encodedSize(StartupMessage msg, ProtocolVersion version)
        {
            return CBUtil.sizeOfStringMap(msg.options);
        }
    };

    public final Map options;

    public StartupMessage(Map options)
    {
        super(Message.Type.STARTUP);
        this.options = options;
    }

    @Override
    protected Message.Response execute(QueryState state, long queryStartNanoTime, boolean traceRequest)
    {
        String cqlVersion = options.get(CQL_VERSION);
        if (cqlVersion == null)
            throw new ProtocolException("Missing value CQL_VERSION in STARTUP message");

        try
        {
            if (new CassandraVersion(cqlVersion).compareTo(new CassandraVersion("2.99.0")) < 0)
                throw new ProtocolException(String.format("CQL version %s is not supported by the binary protocol (supported version are >= 3.0.0)", cqlVersion));
        }
        catch (IllegalArgumentException e)
        {
            throw new ProtocolException(e.getMessage());
        }

        if (options.containsKey(COMPRESSION))
        {
            String compression = options.get(COMPRESSION).toLowerCase();
            if (compression.equals("snappy"))
            {
                if (Compressor.SnappyCompressor.instance == null)
                    throw new ProtocolException("This instance does not support Snappy compression");

                if (getSource().header.version.isGreaterOrEqualTo(ProtocolVersion.V5))
                    throw new ProtocolException("Snappy compression is not supported in protocol V5");

                connection.setCompressor(Compressor.SnappyCompressor.instance);
            }
            else if (compression.equals("lz4"))
            {
                connection.setCompressor(Compressor.LZ4Compressor.instance);
            }
            else
            {
                throw new ProtocolException(String.format("Unknown compression algorithm: %s", compression));
            }
        }

        connection.setThrowOnOverload("1".equals(options.get(THROW_ON_OVERLOAD)));

        ClientState clientState = state.getClientState();
        String driverName = options.get(DRIVER_NAME);
        if (null != driverName)
        {
            clientState.setDriverName(driverName);
            clientState.setDriverVersion(options.get(DRIVER_VERSION));
        }

        if (DatabaseDescriptor.getAuthenticator().requireAuthentication())
            return new AuthenticateMessage(DatabaseDescriptor.getAuthenticator().getClass().getName());
        else
            return new ReadyMessage();
    }

    private static Map upperCaseKeys(Map options)
    {
        Map newMap = new HashMap(options.size());
        for (Map.Entry entry : options.entrySet())
            newMap.put(entry.getKey().toUpperCase(), entry.getValue());
        return newMap;
    }

    @Override
    public String toString()
    {
        return "STARTUP " + options;
    }
}