/*
* 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.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.Executors;
import java.util.concurrent.SynchronousQueue;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLEngine;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.db.ConsistencyLevel;
import org.apache.cassandra.security.SSLFactory;
import org.apache.cassandra.transport.messages.CredentialsMessage;
import org.apache.cassandra.transport.messages.ErrorMessage;
import org.apache.cassandra.transport.messages.ExecuteMessage;
import org.apache.cassandra.transport.messages.PrepareMessage;
import org.apache.cassandra.transport.messages.QueryMessage;
import org.apache.cassandra.transport.messages.ResultMessage;
import org.apache.cassandra.transport.messages.StartupMessage;
import org.jboss.netty.bootstrap.ClientBootstrap;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelFuture;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.channel.ChannelPipelineFactory;
import org.jboss.netty.channel.ChannelStateEvent;
import org.jboss.netty.channel.Channels;
import org.jboss.netty.channel.ExceptionEvent;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.channel.SimpleChannelUpstreamHandler;
import org.jboss.netty.channel.socket.nio.NioClientSocketChannelFactory;
import org.jboss.netty.handler.logging.LoggingHandler;
import org.jboss.netty.handler.ssl.SslHandler;
import org.jboss.netty.logging.InternalLoggerFactory;
import org.jboss.netty.logging.Slf4JLoggerFactory;
import static org.apache.cassandra.config.EncryptionOptions.ClientEncryptionOptions;
public class SimpleClient
{
static
{
InternalLoggerFactory.setDefaultFactory(new Slf4JLoggerFactory());
}
private static final Logger logger = LoggerFactory.getLogger(SimpleClient.class);
public final String host;
public final int port;
private final ClientEncryptionOptions encryptionOptions;
protected final ResponseHandler responseHandler = new ResponseHandler();
protected final Connection.Tracker tracker = new ConnectionTracker();
protected final Connection connection = new Connection(tracker);
protected ClientBootstrap bootstrap;
protected Channel channel;
protected ChannelFuture lastWriteFuture;
private final Connection.Factory connectionFactory = new Connection.Factory()
{
public Connection newConnection(Connection.Tracker tracker)
{
return connection;
}
};
public SimpleClient(String host, int port, ClientEncryptionOptions encryptionOptions)
{
this.host = host;
this.port = port;
this.encryptionOptions = encryptionOptions;
}
public SimpleClient(String host, int port)
{
this(host, port, new ClientEncryptionOptions());
}
public void connect(boolean useCompression) throws IOException
{
establishConnection();
Map<String, String> options = new HashMap<String, String>();
options.put(StartupMessage.CQL_VERSION, "3.0.0");
if (useCompression)
{
options.put(StartupMessage.COMPRESSION, "snappy");
connection.setCompressor(FrameCompressor.SnappyCompressor.instance);
}
execute(new StartupMessage(options));
}
protected void establishConnection() throws IOException
{
// Configure the client.
bootstrap = new ClientBootstrap(
new NioClientSocketChannelFactory(
Executors.newCachedThreadPool(),
Executors.newCachedThreadPool()));
bootstrap.setOption("tcpNoDelay", true);
// Configure the pipeline factory.
if(encryptionOptions.enabled)
{
bootstrap.setPipelineFactory(new SecurePipelineFactory());
}
else
{
bootstrap.setPipelineFactory(new PipelineFactory());
}
ChannelFuture future = bootstrap.connect(new InetSocketAddress(host, port));
// Wait until the connection attempt succeeds or fails.
channel = future.awaitUninterruptibly().getChannel();
if (!future.isSuccess())
{
bootstrap.releaseExternalResources();
throw new IOException("Connection Error", future.getCause());
}
}
public void login(Map<String, String> credentials)
{
CredentialsMessage msg = new CredentialsMessage();
msg.credentials.putAll(credentials);
execute(msg);
}
public ResultMessage execute(String query, ConsistencyLevel consistency)
{
Message.Response msg = execute(new QueryMessage(query, consistency));
assert msg instanceof ResultMessage;
return (ResultMessage)msg;
}
public ResultMessage.Prepared prepare(String query)
{
Message.Response msg = execute(new PrepareMessage(query));
assert msg instanceof ResultMessage.Prepared;
return (ResultMessage.Prepared)msg;
}
public ResultMessage executePrepared(byte[] statementId, List<ByteBuffer> values, ConsistencyLevel consistency)
{
Message.Response msg = execute(new ExecuteMessage(statementId, values, consistency));
assert msg instanceof ResultMessage;
return (ResultMessage)msg;
}
public void close()
{
// Wait until all messages are flushed before closing the channel.
if (lastWriteFuture != null)
lastWriteFuture.awaitUninterruptibly();
// Close the connection. Make sure the close operation ends because
// all I/O operations are asynchronous in Netty.
channel.close().awaitUninterruptibly();
// Shut down all thread pools to exit.
bootstrap.releaseExternalResources();
}
protected Message.Response execute(Message.Request request)
{
try
{
request.attach(connection);
lastWriteFuture = channel.write(request);
Message.Response msg = responseHandler.responses.take();
if (msg instanceof ErrorMessage)
throw new RuntimeException((Throwable)((ErrorMessage)msg).error);
return msg;
}
catch (InterruptedException e)
{
throw new RuntimeException(e);
}
}
// Stateless handlers
private static final Message.ProtocolDecoder messageDecoder = new Message.ProtocolDecoder();
private static final Message.ProtocolEncoder messageEncoder = new Message.ProtocolEncoder();
private static final Frame.Decompressor frameDecompressor = new Frame.Decompressor();
private static final Frame.Compressor frameCompressor = new Frame.Compressor();
private static final Frame.Encoder frameEncoder = new Frame.Encoder();
private static class ConnectionTracker implements Connection.Tracker
{
public void addConnection(Channel ch, Connection connection) {}
public void closeAll() {}
}
private class PipelineFactory implements ChannelPipelineFactory
{
public ChannelPipeline getPipeline() throws Exception
{
ChannelPipeline pipeline = Channels.pipeline();
//pipeline.addLast("debug", new LoggingHandler());
pipeline.addLast("frameDecoder", new Frame.Decoder(tracker, connectionFactory));
pipeline.addLast("frameEncoder", frameEncoder);
pipeline.addLast("frameDecompressor", frameDecompressor);
pipeline.addLast("frameCompressor", frameCompressor);
pipeline.addLast("messageDecoder", messageDecoder);
pipeline.addLast("messageEncoder", messageEncoder);
pipeline.addLast("handler", responseHandler);
return pipeline;
}
}
private class SecurePipelineFactory extends PipelineFactory
{
private final SSLContext sslContext;
public SecurePipelineFactory() throws IOException
{
this.sslContext = SSLFactory.createSSLContext(encryptionOptions, true);
}
public ChannelPipeline getPipeline() throws Exception
{
SSLEngine sslEngine = sslContext.createSSLEngine();
sslEngine.setUseClientMode(true);
sslEngine.setEnabledCipherSuites(encryptionOptions.cipher_suites);
ChannelPipeline pipeline = super.getPipeline();
pipeline.addFirst("ssl", new SslHandler(sslEngine));
return pipeline;
}
}
private static class ResponseHandler extends SimpleChannelUpstreamHandler
{
public final BlockingQueue<Message.Response> responses = new SynchronousQueue<Message.Response>(true);
@Override
public void messageReceived(ChannelHandlerContext ctx, MessageEvent e)
{
assert e.getMessage() instanceof Message.Response;
try
{
responses.put((Message.Response)e.getMessage());
}
catch (InterruptedException ie)
{
throw new RuntimeException(ie);
}
}
public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) throws Exception
{
if (this == ctx.getPipeline().getLast())
logger.error("Exception in response", e.getCause());
ctx.sendUpstream(e);
}
}
}