/*
* 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.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.UnknownHostException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.CharacterCodingException;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CoderResult;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.util.CharsetUtil;
import org.apache.cassandra.db.ConsistencyLevel;
import org.apache.cassandra.db.TypeSizes;
import org.apache.cassandra.utils.UUIDGen;
import org.apache.cassandra.utils.ByteBufferUtil;
/**
* ChannelBuffer utility methods.
* Note that contrarily to ByteBufferUtil, these method do "read" the
* ChannelBuffer advancing it's (read) position. They also write by
* advancing the write position. Functions are also provided to create
* ChannelBuffer while avoiding copies.
*/
public abstract class CBUtil
{
private CBUtil() {}
private final static ThreadLocal<CharsetDecoder> decoder = new ThreadLocal<CharsetDecoder>()
{
@Override
protected CharsetDecoder initialValue()
{
return Charset.forName("UTF-8").newDecoder();
}
};
private static String readString(ChannelBuffer cb, int length)
{
if (length == 0)
return "";
ByteBuffer buffer = cb.toByteBuffer(cb.readerIndex(), length);
try
{
String str = decodeString(buffer);
cb.readerIndex(cb.readerIndex() + length);
return str;
}
catch (IllegalStateException | CharacterCodingException e)
{
throw new ProtocolException("Cannot decode string as UTF8: '" + ByteBufferUtil.bytesToHex(buffer) + "'; " + e);
}
}
public static String readString(ChannelBuffer cb)
{
try
{
int length = cb.readUnsignedShort();
return readString(cb, length);
}
catch (IndexOutOfBoundsException e)
{
throw new ProtocolException("Not enough bytes to read an UTF8 serialized string preceded by it's 2 bytes length");
}
}
// Taken from Netty's ChannelBuffers.decodeString(). We need to use our own decoder to properly handle invalid
// UTF-8 sequences. See CASSANDRA-8101 for more details. This can be removed once https://github.com/netty/netty/pull/2999
// is resolved in a release used by Cassandra.
private static String decodeString(ByteBuffer src) throws CharacterCodingException
{
// the decoder needs to be reset every time we use it, hence the copy per thread
CharsetDecoder theDecoder = decoder.get();
theDecoder.reset();
final CharBuffer dst = CharBuffer.allocate(
(int) ((double) src.remaining() * theDecoder.maxCharsPerByte()));
CoderResult cr = theDecoder.decode(src, dst, true);
if (!cr.isUnderflow())
cr.throwException();
cr = theDecoder.flush(dst);
if (!cr.isUnderflow())
cr.throwException();
return dst.flip().toString();
}
public static void writeString(String str, ChannelBuffer cb)
{
byte[] bytes = str.getBytes(CharsetUtil.UTF_8);
cb.writeShort(bytes.length);
cb.writeBytes(bytes);
}
public static int sizeOfString(String str)
{
return 2 + TypeSizes.encodedUTF8Length(str);
}
public static String readLongString(ChannelBuffer cb)
{
try
{
int length = cb.readInt();
return readString(cb, length);
}
catch (IndexOutOfBoundsException e)
{
throw new ProtocolException("Not enough bytes to read an UTF8 serialized string preceded by it's 4 bytes length");
}
}
public static void writeLongString(String str, ChannelBuffer cb)
{
byte[] bytes = str.getBytes(CharsetUtil.UTF_8);
cb.writeInt(bytes.length);
cb.writeBytes(bytes);
}
public static int sizeOfLongString(String str)
{
return 4 + str.getBytes(CharsetUtil.UTF_8).length;
}
public static byte[] readBytes(ChannelBuffer cb)
{
try
{
int length = cb.readUnsignedShort();
byte[] bytes = new byte[length];
cb.readBytes(bytes);
return bytes;
}
catch (IndexOutOfBoundsException e)
{
throw new ProtocolException("Not enough bytes to read a byte array preceded by it's 2 bytes length");
}
}
public static void writeBytes(byte[] bytes, ChannelBuffer cb)
{
cb.writeShort(bytes.length);
cb.writeBytes(bytes);
}
public static int sizeOfBytes(byte[] bytes)
{
return 2 + bytes.length;
}
public static ConsistencyLevel readConsistencyLevel(ChannelBuffer cb)
{
return ConsistencyLevel.fromCode(cb.readUnsignedShort());
}
public static void writeConsistencyLevel(ConsistencyLevel consistency, ChannelBuffer cb)
{
cb.writeShort(consistency.code);
}
public static int sizeOfConsistencyLevel(ConsistencyLevel consistency)
{
return 2;
}
public static <T extends Enum<T>> T readEnumValue(Class<T> enumType, ChannelBuffer cb)
{
String value = CBUtil.readString(cb);
try
{
return Enum.valueOf(enumType, value.toUpperCase());
}
catch (IllegalArgumentException e)
{
throw new ProtocolException(String.format("Invalid value '%s' for %s", value, enumType.getSimpleName()));
}
}
public static <T extends Enum<T>> void writeEnumValue(T enumValue, ChannelBuffer cb)
{
writeString(enumValue.toString(), cb);
}
public static <T extends Enum<T>> int sizeOfEnumValue(T enumValue)
{
return sizeOfString(enumValue.toString());
}
public static UUID readUUID(ChannelBuffer cb)
{
byte[] bytes = new byte[16];
cb.readBytes(bytes);
return UUIDGen.getUUID(ByteBuffer.wrap(bytes));
}
public static void writeUUID(UUID uuid, ChannelBuffer cb)
{
cb.writeBytes(UUIDGen.decompose(uuid));
}
public static int sizeOfUUID(UUID uuid)
{
return 16;
}
public static List<String> readStringList(ChannelBuffer cb)
{
int length = cb.readUnsignedShort();
List<String> l = new ArrayList<String>(length);
for (int i = 0; i < length; i++)
l.add(readString(cb));
return l;
}
public static void writeStringList(List<String> l, ChannelBuffer cb)
{
cb.writeShort(l.size());
for (String str : l)
writeString(str, cb);
}
public static int sizeOfStringList(List<String> l)
{
int size = 2;
for (String str : l)
size += sizeOfString(str);
return size;
}
public static Map<String, String> readStringMap(ChannelBuffer cb)
{
int length = cb.readUnsignedShort();
Map<String, String> m = new HashMap<String, String>(length);
for (int i = 0; i < length; i++)
{
String k = readString(cb);
String v = readString(cb);
m.put(k, v);
}
return m;
}
public static void writeStringMap(Map<String, String> m, ChannelBuffer cb)
{
cb.writeShort(m.size());
for (Map.Entry<String, String> entry : m.entrySet())
{
writeString(entry.getKey(), cb);
writeString(entry.getValue(), cb);
}
}
public static int sizeOfStringMap(Map<String, String> m)
{
int size = 2;
for (Map.Entry<String, String> entry : m.entrySet())
{
size += sizeOfString(entry.getKey());
size += sizeOfString(entry.getValue());
}
return size;
}
public static Map<String, List<String>> readStringToStringListMap(ChannelBuffer cb)
{
int length = cb.readUnsignedShort();
Map<String, List<String>> m = new HashMap<String, List<String>>(length);
for (int i = 0; i < length; i++)
{
String k = readString(cb).toUpperCase();
List<String> v = readStringList(cb);
m.put(k, v);
}
return m;
}
public static void writeStringToStringListMap(Map<String, List<String>> m, ChannelBuffer cb)
{
cb.writeShort(m.size());
for (Map.Entry<String, List<String>> entry : m.entrySet())
{
writeString(entry.getKey(), cb);
writeStringList(entry.getValue(), cb);
}
}
public static int sizeOfStringToStringListMap(Map<String, List<String>> m)
{
int size = 2;
for (Map.Entry<String, List<String>> entry : m.entrySet())
{
size += sizeOfString(entry.getKey());
size += sizeOfStringList(entry.getValue());
}
return size;
}
public static ByteBuffer readValue(ChannelBuffer cb)
{
int length = cb.readInt();
return length < 0 ? null : cb.readSlice(length).toByteBuffer();
}
public static void writeValue(byte[] bytes, ChannelBuffer cb)
{
if (bytes == null)
{
cb.writeInt(-1);
return;
}
cb.writeInt(bytes.length);
cb.writeBytes(bytes);
}
public static void writeValue(ByteBuffer bytes, ChannelBuffer cb)
{
if (bytes == null)
{
cb.writeInt(-1);
return;
}
cb.writeInt(bytes.remaining());
cb.writeBytes(bytes.duplicate());
}
public static int sizeOfValue(byte[] bytes)
{
return 4 + (bytes == null ? 0 : bytes.length);
}
public static int sizeOfValue(ByteBuffer bytes)
{
return 4 + (bytes == null ? 0 : bytes.remaining());
}
public static List<ByteBuffer> readValueList(ChannelBuffer cb)
{
int size = cb.readUnsignedShort();
if (size == 0)
return Collections.<ByteBuffer>emptyList();
List<ByteBuffer> l = new ArrayList<ByteBuffer>(size);
for (int i = 0; i < size; i++)
l.add(readValue(cb));
return l;
}
public static void writeValueList(List<ByteBuffer> values, ChannelBuffer cb)
{
cb.writeShort(values.size());
for (ByteBuffer value : values)
CBUtil.writeValue(value, cb);
}
public static int sizeOfValueList(List<ByteBuffer> values)
{
int size = 2;
for (ByteBuffer value : values)
size += CBUtil.sizeOfValue(value);
return size;
}
public static InetSocketAddress readInet(ChannelBuffer cb)
{
int addrSize = cb.readByte();
byte[] address = new byte[addrSize];
cb.readBytes(address);
int port = cb.readInt();
try
{
return new InetSocketAddress(InetAddress.getByAddress(address), port);
}
catch (UnknownHostException e)
{
throw new ProtocolException(String.format("Invalid IP address (%d.%d.%d.%d) while deserializing inet address", address[0], address[1], address[2], address[3]));
}
}
public static void writeInet(InetSocketAddress inet, ChannelBuffer cb)
{
byte[] address = inet.getAddress().getAddress();
cb.writeByte(address.length);
cb.writeBytes(address);
cb.writeInt(inet.getPort());
}
public static int sizeOfInet(InetSocketAddress inet)
{
byte[] address = inet.getAddress().getAddress();
return 1 + address.length + 4;
}
/*
* Reads *all* readable bytes from {@code cb} and return them.
* If {@code cb} is backed by an array, this will return the underlying array directly, without copy.
*/
public static byte[] readRawBytes(ChannelBuffer cb)
{
if (cb.hasArray() && cb.readableBytes() == cb.array().length)
{
// Move the readerIndex just so we consistenly consume the input
cb.readerIndex(cb.writerIndex());
return cb.array();
}
// Otherwise, just read the bytes in a new array
byte[] bytes = new byte[cb.readableBytes()];
cb.readBytes(bytes);
return bytes;
}
}