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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.
/*
* 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;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.util.*;
import com.google.common.base.Splitter;
import org.apache.cassandra.auth.PasswordAuthenticator;
import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.cql3.QueryOptions;
import org.apache.cassandra.db.ConsistencyLevel;
import org.apache.cassandra.db.marshal.Int32Type;
import org.apache.cassandra.db.marshal.UTF8Type;
import org.apache.cassandra.transport.messages.*;
import org.apache.cassandra.utils.Hex;
import org.apache.cassandra.utils.JVMStabilityInspector;
import org.apache.cassandra.utils.MD5Digest;
import static org.apache.cassandra.config.EncryptionOptions.ClientEncryptionOptions;
public class Client extends SimpleClient
{
private final SimpleEventHandler eventHandler = new SimpleEventHandler();
public Client(String host, int port, ProtocolVersion version, ClientEncryptionOptions encryptionOptions)
{
super(host, port, version, encryptionOptions);
setEventHandler(eventHandler);
}
public void run() throws IOException
{
// Start the connection attempt.
System.out.print("Connecting...");
establishConnection();
System.out.println();
// Read commands from the stdin.
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
for (;;)
{
Event event;
while ((event = eventHandler.queue.poll()) != null)
{
System.out.println("<< " + event);
}
System.out.print(">> ");
System.out.flush();
String line = in.readLine();
if (line == null)
{
break;
}
Message.Request req = parseLine(line.trim());
if (req == null)
{
System.out.println("! Error parsing line.");
continue;
}
try
{
Message.Response resp = execute(req);
System.out.println("-> " + resp);
}
catch (Exception e)
{
JVMStabilityInspector.inspectThrowable(e);
System.err.println("ERROR: " + e.getMessage());
}
}
close();
}
private Message.Request parseLine(String line)
{
Splitter splitter = Splitter.on(' ').trimResults().omitEmptyStrings();
Iterator iter = splitter.split(line).iterator();
if (!iter.hasNext())
return null;
String msgType = iter.next().toUpperCase();
if (msgType.equals("STARTUP"))
{
Map options = new HashMap();
options.put(StartupMessage.CQL_VERSION, "3.0.0");
while (iter.hasNext())
{
String next = iter.next();
if (next.toLowerCase().equals("snappy"))
{
options.put(StartupMessage.COMPRESSION, "snappy");
connection.setCompressor(FrameCompressor.SnappyCompressor.instance);
}
}
return new StartupMessage(options);
}
else if (msgType.equals("QUERY"))
{
line = line.substring(6);
// Ugly hack to allow setting a page size, but that's playground code anyway
String query = line;
int pageSize = -1;
if (line.matches(".+ !\\d+$"))
{
int idx = line.lastIndexOf('!');
query = line.substring(0, idx-1);
try
{
pageSize = Integer.parseInt(line.substring(idx+1, line.length()));
}
catch (NumberFormatException e)
{
return null;
}
}
return new QueryMessage(query, QueryOptions.create(ConsistencyLevel.ONE, Collections.emptyList(), false, pageSize, null, null, version));
}
else if (msgType.equals("PREPARE"))
{
String query = line.substring(8);
return new PrepareMessage(query);
}
else if (msgType.equals("EXECUTE"))
{
try
{
byte[] id = Hex.hexToBytes(iter.next());
List values = new ArrayList();
while(iter.hasNext())
{
String next = iter.next();
ByteBuffer bb;
try
{
int v = Integer.parseInt(next);
bb = Int32Type.instance.decompose(v);
}
catch (NumberFormatException e)
{
bb = UTF8Type.instance.decompose(next);
}
values.add(bb);
}
return new ExecuteMessage(MD5Digest.wrap(id), QueryOptions.forInternalCalls(ConsistencyLevel.ONE, values));
}
catch (Exception e)
{
return null;
}
}
else if (msgType.equals("OPTIONS"))
{
return new OptionsMessage();
}
else if (msgType.equals("CREDENTIALS"))
{
System.err.println("[WARN] CREDENTIALS command is deprecated, use AUTHENTICATE instead");
CredentialsMessage msg = new CredentialsMessage();
msg.credentials.putAll(readCredentials(iter));
return msg;
}
else if (msgType.equals("AUTHENTICATE"))
{
Map credentials = readCredentials(iter);
if(!credentials.containsKey(PasswordAuthenticator.USERNAME_KEY) || !credentials.containsKey(PasswordAuthenticator.PASSWORD_KEY))
{
System.err.println("[ERROR] Authentication requires both 'username' and 'password'");
return null;
}
return new AuthResponse(encodeCredentialsForSasl(credentials));
}
else if (msgType.equals("REGISTER"))
{
String type = line.substring(9).toUpperCase();
try
{
return new RegisterMessage(Collections.singletonList(Enum.valueOf(Event.Type.class, type)));
}
catch (IllegalArgumentException e)
{
System.err.println("[ERROR] Unknown event type: " + type);
return null;
}
}
return null;
}
private Map readCredentials(Iterator iter)
{
final Map credentials = new HashMap();
while (iter.hasNext())
{
String next = iter.next();
String[] kv = next.split("=");
if (kv.length != 2)
{
System.err.println("[ERROR] Default authentication requires username & password");
return null;
}
credentials.put(kv[0], kv[1]);
}
return credentials;
}
private byte[] encodeCredentialsForSasl(Map credentials)
{
byte[] username = credentials.get(PasswordAuthenticator.USERNAME_KEY).getBytes(StandardCharsets.UTF_8);
byte[] password = credentials.get(PasswordAuthenticator.PASSWORD_KEY).getBytes(StandardCharsets.UTF_8);
byte[] initialResponse = new byte[username.length + password.length + 2];
initialResponse[0] = 0;
System.arraycopy(username, 0, initialResponse, 1, username.length);
initialResponse[username.length + 1] = 0;
System.arraycopy(password, 0, initialResponse, username.length + 2, password.length);
return initialResponse;
}
public static void main(String[] args) throws Exception
{
DatabaseDescriptor.clientInitialization();
// Print usage if no argument is specified.
if (args.length < 2 || args.length > 3)
{
System.err.println("Usage: " + Client.class.getSimpleName() + " []");
return;
}
// Parse options.
String host = args[0];
int port = Integer.parseInt(args[1]);
ProtocolVersion version = args.length == 3 ? ProtocolVersion.decode(Integer.parseInt(args[2]), ProtocolVersionLimit.SERVER_DEFAULT) : ProtocolVersion.CURRENT;
ClientEncryptionOptions encryptionOptions = new ClientEncryptionOptions();
System.out.println("CQL binary protocol console " + host + "@" + port + " using native protocol version " + version);
new Client(host, port, version, encryptionOptions).run();
System.exit(0);
}
}