/**
* Copyright 2016 Nikita Koksharov
*
* 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 org.redisson.client.handler;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.redisson.client.codec.StringCodec;
import org.redisson.client.protocol.CommandData;
import org.redisson.client.protocol.DefaultParamsEncoder;
import org.redisson.client.protocol.Encoder;
import org.redisson.client.protocol.RedisCommand.ValueType;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPromise;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.handler.codec.MessageToByteEncoder;
import io.netty.util.CharsetUtil;
/**
* Redis protocol command encoder
*
* Code parts from Sam Pullara
*
* @author Nikita Koksharov
*
*/
@Sharable
public class CommandEncoder extends MessageToByteEncoder<CommandData<?, ?>> {
public static final CommandEncoder INSTANCE = new CommandEncoder();
private final Logger log = LoggerFactory.getLogger(getClass());
private final Encoder paramsEncoder = new DefaultParamsEncoder();
private static final char ARGS_PREFIX = '*';
private static final char BYTES_PREFIX = '$';
private static final byte[] CRLF = "\r\n".getBytes();
private static final Map<Long, byte[]> longCache = new HashMap<Long, byte[]>();
@Override
public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
try {
super.write(ctx, msg, promise);
} catch (Exception e) {
promise.tryFailure(e);
throw e;
}
}
@Override
protected void encode(ChannelHandlerContext ctx, CommandData<?, ?> msg, ByteBuf out) throws Exception {
try {
out.writeByte(ARGS_PREFIX);
int len = 1 + msg.getParams().length;
if (msg.getCommand().getSubName() != null) {
len++;
}
out.writeBytes(convert(len));
out.writeBytes(CRLF);
writeArgument(out, msg.getCommand().getName().getBytes("UTF-8"));
if (msg.getCommand().getSubName() != null) {
writeArgument(out, msg.getCommand().getSubName().getBytes("UTF-8"));
}
int i = 1;
for (Object param : msg.getParams()) {
Encoder encoder = paramsEncoder;
if (msg.getCommand().getInParamType().size() == 1) {
if (msg.getCommand().getInParamIndex() == i
&& msg.getCommand().getInParamType().get(0) == ValueType.OBJECT) {
encoder = msg.getCodec().getValueEncoder();
} else if (msg.getCommand().getInParamIndex() <= i
&& msg.getCommand().getInParamType().get(0) != ValueType.OBJECT) {
encoder = selectEncoder(msg, i - msg.getCommand().getInParamIndex());
}
} else {
if (msg.getCommand().getInParamIndex() <= i) {
int paramNum = i - msg.getCommand().getInParamIndex();
encoder = selectEncoder(msg, paramNum);
}
}
writeArgument(out, encoder.encode(param));
i++;
}
if (log.isTraceEnabled()) {
log.trace("channel: {} message: {}", ctx.channel(), out.toString(CharsetUtil.UTF_8));
}
} catch (Exception e) {
msg.getPromise().tryFailure(e);
throw e;
}
}
private Encoder selectEncoder(CommandData<?, ?> msg, int param) {
int typeIndex = 0;
List<ValueType> inParamType = msg.getCommand().getInParamType();
if (inParamType.size() > 1) {
typeIndex = param;
}
if (inParamType.get(typeIndex) == ValueType.MAP) {
if (param % 2 != 0) {
return msg.getCodec().getMapValueEncoder();
} else {
return msg.getCodec().getMapKeyEncoder();
}
}
if (inParamType.get(typeIndex) == ValueType.MAP_KEY) {
return msg.getCodec().getMapKeyEncoder();
}
if (inParamType.get(typeIndex) == ValueType.MAP_VALUE) {
return msg.getCodec().getMapValueEncoder();
}
if (inParamType.get(typeIndex) == ValueType.OBJECTS) {
return msg.getCodec().getValueEncoder();
}
if (inParamType.get(typeIndex) == ValueType.OBJECT) {
return msg.getCodec().getValueEncoder();
}
if (inParamType.get(typeIndex) == ValueType.STRING) {
return StringCodec.INSTANCE.getValueEncoder();
}
throw new IllegalStateException();
}
private void writeArgument(ByteBuf out, byte[] arg) {
out.writeByte(BYTES_PREFIX);
out.writeBytes(convert(arg.length));
out.writeBytes(CRLF);
out.writeBytes(arg);
out.writeBytes(CRLF);
}
static final char[] DIGITTENS = { '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '1', '1', '1', '1', '1', '1',
'1', '1', '1', '1', '2', '2', '2', '2', '2', '2', '2', '2', '2', '2', '3', '3', '3', '3', '3', '3', '3',
'3', '3', '3', '4', '4', '4', '4', '4', '4', '4', '4', '4', '4', '5', '5', '5', '5', '5', '5', '5', '5',
'5', '5', '6', '6', '6', '6', '6', '6', '6', '6', '6', '6', '7', '7', '7', '7', '7', '7', '7', '7', '7',
'7', '8', '8', '8', '8', '8', '8', '8', '8', '8', '8', '9', '9', '9', '9', '9', '9', '9', '9', '9', '9', };
static final char[] DIGITONES = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '1', '2', '3', '4', '5',
'6', '7', '8', '9', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '1', '2', '3', '4', '5', '6',
'7', '8', '9', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '1', '2', '3', '4', '5', '6', '7', '8',
'9', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', };
static final char[] DIGITS = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', 'g',
'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z' };
static final int[] SIZETABLE = { 9, 99, 999, 9999, 99999, 999999, 9999999, 99999999, 999999999, Integer.MAX_VALUE };
// Requires positive x
static int stringSize(long x) {
for (int i = 0;; i++)
if (x <= SIZETABLE[i])
return i + 1;
}
static void getChars(long i, int index, byte[] buf) {
long q, r;
int charPos = index;
byte sign = 0;
if (i < 0) {
sign = '-';
i = -i;
}
// Generate two digits per iteration
while (i >= 65536) {
q = i / 100;
// really: r = i - (q * 100);
r = i - ((q << 6) + (q << 5) + (q << 2));
i = q;
buf[--charPos] = (byte) DIGITONES[(int) r];
buf[--charPos] = (byte) DIGITTENS[(int) r];
}
// Fall thru to fast mode for smaller numbers
// assert(i <= 65536, i);
for (;;) {
q = (i * 52429) >>> (16 + 3);
r = i - ((q << 3) + (q << 1)); // r = i-(q*10) ...
buf[--charPos] = (byte) DIGITS[(int) r];
i = q;
if (i == 0)
break;
}
if (sign != 0) {
buf[--charPos] = sign;
}
}
public static byte[] convert(long i) {
if (i >= 0 && i <= 255) {
return longCache.get(i);
}
return toChars(i);
}
public static byte[] toChars(long i) {
int size = (i < 0) ? stringSize(-i) + 1 : stringSize(i);
byte[] buf = new byte[size];
getChars(i, size, buf);
return buf;
}
static {
for (long i = 0; i < 256; i++) {
byte[] value = toChars(i);
longCache.put(i, value);
}
}
}