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A driver for Apache Cassandra 1.2+ that works exclusively with the Cassandra Query Language version 3
(CQL3) and Cassandra's binary protocol.
/*
* Copyright (C) 2012-2015 DataStax Inc.
*
* Licensed 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 com.datastax.driver.core;
import com.datastax.driver.core.exceptions.DriverInternalError;
import com.google.common.collect.ImmutableMap;
import io.netty.buffer.ByteBuf;
import io.netty.util.CharsetUtil;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.UnknownHostException;
import java.nio.ByteBuffer;
import java.nio.charset.CharacterCodingException;
import java.util.*;
/**
* ByteBuf utility methods.
*/
abstract class CBUtil { // TODO rename
private CBUtil() {
}
private static String readString(ByteBuf cb, int length) {
try {
String str = cb.toString(cb.readerIndex(), length, CharsetUtil.UTF_8);
cb.readerIndex(cb.readerIndex() + length);
return str;
} catch (IllegalStateException e) {
// That's the way netty encapsulate a CCE
if (e.getCause() instanceof CharacterCodingException)
throw new DriverInternalError("Cannot decode string as UTF8");
else
throw e;
}
}
public static String readString(ByteBuf cb) {
try {
int length = cb.readUnsignedShort();
return readString(cb, length);
} catch (IndexOutOfBoundsException e) {
throw new DriverInternalError("Not enough bytes to read an UTF8 serialized string preceded by it's 2 bytes length");
}
}
public static void writeString(String str, ByteBuf cb) {
byte[] bytes = str.getBytes(CharsetUtil.UTF_8);
cb.writeShort(bytes.length);
cb.writeBytes(bytes);
}
public static int sizeOfString(String str) {
return 2 + encodedUTF8Length(str);
}
private static int encodedUTF8Length(String st) {
int strlen = st.length();
int utflen = 0;
for (int i = 0; i < strlen; i++) {
int c = st.charAt(i);
if ((c >= 0x0001) && (c <= 0x007F))
utflen++;
else if (c > 0x07FF)
utflen += 3;
else
utflen += 2;
}
return utflen;
}
public static String readLongString(ByteBuf cb) {
try {
int length = cb.readInt();
return readString(cb, length);
} catch (IndexOutOfBoundsException e) {
throw new DriverInternalError("Not enough bytes to read an UTF8 serialized string preceded by it's 4 bytes length");
}
}
public static void writeLongString(String str, ByteBuf 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(ByteBuf cb) {
try {
int length = cb.readUnsignedShort();
byte[] bytes = new byte[length];
cb.readBytes(bytes);
return bytes;
} catch (IndexOutOfBoundsException e) {
throw new DriverInternalError("Not enough bytes to read a byte array preceded by it's 2 bytes length");
}
}
public static void writeBytes(byte[] bytes, ByteBuf cb) {
cb.writeShort(bytes.length);
cb.writeBytes(bytes);
}
public static void writeBytes(ByteBuffer bytes, ByteBuf cb) {
cb.writeShort(bytes.remaining());
cb.writeBytes(bytes.duplicate());
}
public static int sizeOfBytes(byte[] bytes) {
return 2 + bytes.length;
}
public static int sizeOfBytes(ByteBuffer bytes) {
return 2 + bytes.remaining();
}
public static Map readBytesMap(ByteBuf cb) {
int length = cb.readUnsignedShort();
ImmutableMap.Builder builder = ImmutableMap.builder();
for (int i = 0; i < length; i++) {
String key = readString(cb);
ByteBuffer value = readValue(cb);
if (value == null)
value = Statement.NULL_PAYLOAD_VALUE;
builder.put(key, value);
}
return builder.build();
}
public static void writeBytesMap(Map m, ByteBuf cb) {
cb.writeShort(m.size());
for (Map.Entry entry : m.entrySet()) {
writeString(entry.getKey(), cb);
ByteBuffer value = entry.getValue();
if (value == Statement.NULL_PAYLOAD_VALUE)
value = null;
writeValue(value, cb);
}
}
public static int sizeOfBytesMap(Map m) {
int size = 2;
for (Map.Entry entry : m.entrySet()) {
size += sizeOfString(entry.getKey());
size += sizeOfBytes(entry.getValue());
}
return size;
}
public static ConsistencyLevel readConsistencyLevel(ByteBuf cb) {
return ConsistencyLevel.fromCode(cb.readUnsignedShort());
}
public static void writeConsistencyLevel(ConsistencyLevel consistency, ByteBuf cb) {
cb.writeShort(consistency.code);
}
public static int sizeOfConsistencyLevel(ConsistencyLevel consistency) {
return 2;
}
public static > T readEnumValue(Class enumType, ByteBuf cb) {
String value = CBUtil.readString(cb);
try {
return Enum.valueOf(enumType, value.toUpperCase());
} catch (IllegalArgumentException e) {
throw new DriverInternalError(String.format("Invalid value '%s' for %s", value, enumType.getSimpleName()));
}
}
public static > void writeEnumValue(T enumValue, ByteBuf cb) {
writeString(enumValue.toString(), cb);
}
public static > int sizeOfEnumValue(T enumValue) {
return sizeOfString(enumValue.toString());
}
public static UUID readUUID(ByteBuf cb) {
long msb = cb.readLong();
long lsb = cb.readLong();
return new UUID(msb, lsb);
}
public static void writeUUID(UUID uuid, ByteBuf cb) {
cb.writeLong(uuid.getMostSignificantBits());
cb.writeLong(uuid.getLeastSignificantBits());
}
public static int sizeOfUUID(UUID uuid) {
return 16;
}
public static List readStringList(ByteBuf cb) {
int length = cb.readUnsignedShort();
List l = new ArrayList(length);
for (int i = 0; i < length; i++)
l.add(readString(cb));
return l;
}
public static void writeStringList(List l, ByteBuf cb) {
cb.writeShort(l.size());
for (String str : l)
writeString(str, cb);
}
public static int sizeOfStringList(List l) {
int size = 2;
for (String str : l)
size += sizeOfString(str);
return size;
}
public static Map readStringMap(ByteBuf cb) {
int length = cb.readUnsignedShort();
Map m = new HashMap(length);
for (int i = 0; i < length; i++) {
String k = readString(cb).toUpperCase();
String v = readString(cb);
m.put(k, v);
}
return m;
}
public static void writeStringMap(Map m, ByteBuf cb) {
cb.writeShort(m.size());
for (Map.Entry entry : m.entrySet()) {
writeString(entry.getKey(), cb);
writeString(entry.getValue(), cb);
}
}
public static int sizeOfStringMap(Map m) {
int size = 2;
for (Map.Entry entry : m.entrySet()) {
size += sizeOfString(entry.getKey());
size += sizeOfString(entry.getValue());
}
return size;
}
public static Map> readStringToStringListMap(ByteBuf cb) {
int length = cb.readUnsignedShort();
Map> m = new HashMap>(length);
for (int i = 0; i < length; i++) {
String k = readString(cb).toUpperCase();
List v = readStringList(cb);
m.put(k, v);
}
return m;
}
public static void writeStringToStringListMap(Map> m, ByteBuf cb) {
cb.writeShort(m.size());
for (Map.Entry> entry : m.entrySet()) {
writeString(entry.getKey(), cb);
writeStringList(entry.getValue(), cb);
}
}
public static int sizeOfStringToStringListMap(Map> m) {
int size = 2;
for (Map.Entry> entry : m.entrySet()) {
size += sizeOfString(entry.getKey());
size += sizeOfStringList(entry.getValue());
}
return size;
}
public static ByteBuffer readValue(ByteBuf cb) {
int length = cb.readInt();
if (length < 0)
return null;
ByteBuf slice = cb.readSlice(length);
return ByteBuffer.wrap(readRawBytes(slice));
}
public static void writeValue(byte[] bytes, ByteBuf cb) {
if (bytes == null) {
cb.writeInt(-1);
return;
}
cb.writeInt(bytes.length);
cb.writeBytes(bytes);
}
public static void writeValue(ByteBuffer bytes, ByteBuf cb) {
if (bytes == null) {
cb.writeInt(-1);
return;
}
if (bytes == BoundStatement.UNSET) {
cb.writeInt(-2);
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 readValueList(ByteBuf cb) {
int size = cb.readUnsignedShort();
if (size == 0)
return Collections.emptyList();
List l = new ArrayList(size);
for (int i = 0; i < size; i++)
l.add(readValue(cb));
return l;
}
public static void writeValueList(List values, ByteBuf cb) {
cb.writeShort(values.size());
for (ByteBuffer value : values)
CBUtil.writeValue(value, cb);
}
public static int sizeOfValueList(List values) {
int size = 2;
for (ByteBuffer value : values)
size += CBUtil.sizeOfValue(value);
return size;
}
public static void writeNamedValueList(Map namedValues, ByteBuf cb) {
cb.writeShort(namedValues.size());
for (Map.Entry entry : namedValues.entrySet()) {
CBUtil.writeString(entry.getKey(), cb);
CBUtil.writeValue(entry.getValue(), cb);
}
}
public static int sizeOfNamedValueList(Map namedValues) {
int size = 2;
for (Map.Entry entry : namedValues.entrySet()) {
size += CBUtil.sizeOfString(entry.getKey());
size += CBUtil.sizeOfValue(entry.getValue());
}
return size;
}
public static InetSocketAddress readInet(ByteBuf 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 DriverInternalError(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, ByteBuf 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(ByteBuf cb) {
if (cb.hasArray() && cb.readableBytes() == cb.array().length) {
// Move the readerIndex just so we consistently 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;
}
}