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    • io.netty.handler.codec.redis.RedisEncoder Maven / Gradle / Ivy

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    This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

    There is a newer version: 35.0.0.Beta1
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    /*
 * Copyright 2016 The Netty Project
 *
 * The Netty Project 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 io.netty.handler.codec.redis;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import io.netty.buffer.ByteBufUtil;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.CodecException;
import io.netty.handler.codec.MessageToMessageEncoder;
import io.netty.util.internal.ObjectUtil;
import io.netty.util.internal.UnstableApi;

import java.util.List;

/**
 * Encodes {@link RedisMessage} into bytes following
 * RESP (REdis Serialization Protocol).
 */
@UnstableApi
public class RedisEncoder extends MessageToMessageEncoder {

    private final RedisMessagePool messagePool;

    /**
     * Creates a new instance with default {@code messagePool}.
     */
    public RedisEncoder() {
        this(FixedRedisMessagePool.INSTANCE);
    }

    /**
     * Creates a new instance.
     * @param messagePool the predefined message pool.
     */
    public RedisEncoder(RedisMessagePool messagePool) {
        this.messagePool = ObjectUtil.checkNotNull(messagePool, "messagePool");
    }

    @Override
    protected void encode(ChannelHandlerContext ctx, RedisMessage msg, List out) throws Exception {
        try {
            writeRedisMessage(ctx.alloc(), msg, out);
        } catch (CodecException e) {
            throw e;
        } catch (Exception e) {
            throw new CodecException(e);
        }
    }

    private void writeRedisMessage(ByteBufAllocator allocator, RedisMessage msg, List out) {
        if (msg instanceof InlineCommandRedisMessage) {
            writeInlineCommandMessage(allocator, (InlineCommandRedisMessage) msg, out);
        } else if (msg instanceof SimpleStringRedisMessage) {
            writeSimpleStringMessage(allocator, (SimpleStringRedisMessage) msg, out);
        } else if (msg instanceof ErrorRedisMessage) {
            writeErrorMessage(allocator, (ErrorRedisMessage) msg, out);
        } else if (msg instanceof IntegerRedisMessage) {
            writeIntegerMessage(allocator, (IntegerRedisMessage) msg, out);
        } else if (msg instanceof FullBulkStringRedisMessage) {
            writeFullBulkStringMessage(allocator, (FullBulkStringRedisMessage) msg, out);
        } else if (msg instanceof BulkStringRedisContent) {
            writeBulkStringContent(allocator, (BulkStringRedisContent) msg, out);
        } else if (msg instanceof BulkStringHeaderRedisMessage) {
            writeBulkStringHeader(allocator, (BulkStringHeaderRedisMessage) msg, out);
        } else if (msg instanceof ArrayHeaderRedisMessage) {
            writeArrayHeader(allocator, (ArrayHeaderRedisMessage) msg, out);
        } else if (msg instanceof ArrayRedisMessage) {
            writeArrayMessage(allocator, (ArrayRedisMessage) msg, out);
        } else {
            throw new CodecException("unknown message type: " + msg);
        }
    }

    private static void writeInlineCommandMessage(ByteBufAllocator allocator, InlineCommandRedisMessage msg,
                                                 List out) {
        writeString(allocator, RedisMessageType.INLINE_COMMAND, msg.content(), out);
    }

    private static void writeSimpleStringMessage(ByteBufAllocator allocator, SimpleStringRedisMessage msg,
                                                 List out) {
        writeString(allocator, RedisMessageType.SIMPLE_STRING, msg.content(), out);
    }

    private static void writeErrorMessage(ByteBufAllocator allocator, ErrorRedisMessage msg, List out) {
        writeString(allocator, RedisMessageType.ERROR, msg.content(), out);
    }

    private static void writeString(ByteBufAllocator allocator, RedisMessageType type, String content,
                                    List out) {
        ByteBuf buf = allocator.ioBuffer(type.length() + ByteBufUtil.utf8MaxBytes(content) +
                                         RedisConstants.EOL_LENGTH);
        type.writeTo(buf);
        ByteBufUtil.writeUtf8(buf, content);
        buf.writeShort(RedisConstants.EOL_SHORT);
        out.add(buf);
    }

    private void writeIntegerMessage(ByteBufAllocator allocator, IntegerRedisMessage msg, List out) {
        ByteBuf buf = allocator.ioBuffer(RedisConstants.TYPE_LENGTH + RedisConstants.LONG_MAX_LENGTH +
                                         RedisConstants.EOL_LENGTH);
        RedisMessageType.INTEGER.writeTo(buf);
        buf.writeBytes(numberToBytes(msg.value()));
        buf.writeShort(RedisConstants.EOL_SHORT);
        out.add(buf);
    }

    private void writeBulkStringHeader(ByteBufAllocator allocator, BulkStringHeaderRedisMessage msg, List out) {
        final ByteBuf buf = allocator.ioBuffer(RedisConstants.TYPE_LENGTH +
                                        (msg.isNull() ? RedisConstants.NULL_LENGTH :
                                                        RedisConstants.LONG_MAX_LENGTH + RedisConstants.EOL_LENGTH));
        RedisMessageType.BULK_STRING.writeTo(buf);
        if (msg.isNull()) {
            buf.writeShort(RedisConstants.NULL_SHORT);
        } else {
            buf.writeBytes(numberToBytes(msg.bulkStringLength()));
            buf.writeShort(RedisConstants.EOL_SHORT);
        }
        out.add(buf);
    }

    private static void writeBulkStringContent(ByteBufAllocator allocator, BulkStringRedisContent msg,
                                               List out) {
        out.add(msg.content().retain());
        if (msg instanceof LastBulkStringRedisContent) {
            out.add(allocator.ioBuffer(RedisConstants.EOL_LENGTH).writeShort(RedisConstants.EOL_SHORT));
        }
    }

    private void writeFullBulkStringMessage(ByteBufAllocator allocator, FullBulkStringRedisMessage msg,
                                            List out) {
        if (msg.isNull()) {
            ByteBuf buf = allocator.ioBuffer(RedisConstants.TYPE_LENGTH + RedisConstants.NULL_LENGTH +
                                             RedisConstants.EOL_LENGTH);
            RedisMessageType.BULK_STRING.writeTo(buf);
            buf.writeShort(RedisConstants.NULL_SHORT);
            buf.writeShort(RedisConstants.EOL_SHORT);
            out.add(buf);
        } else {
            ByteBuf headerBuf = allocator.ioBuffer(RedisConstants.TYPE_LENGTH + RedisConstants.LONG_MAX_LENGTH +
                                                   RedisConstants.EOL_LENGTH);
            RedisMessageType.BULK_STRING.writeTo(headerBuf);
            headerBuf.writeBytes(numberToBytes(msg.content().readableBytes()));
            headerBuf.writeShort(RedisConstants.EOL_SHORT);
            out.add(headerBuf);
            out.add(msg.content().retain());
            out.add(allocator.ioBuffer(RedisConstants.EOL_LENGTH).writeShort(RedisConstants.EOL_SHORT));
        }
    }

    /**
     * Write array header only without body. Use this if you want to write arrays as streaming.
     */
    private void writeArrayHeader(ByteBufAllocator allocator, ArrayHeaderRedisMessage msg, List out) {
        writeArrayHeader(allocator, msg.isNull(), msg.length(), out);
    }

    /**
     * Write full constructed array message.
     */
    private void writeArrayMessage(ByteBufAllocator allocator, ArrayRedisMessage msg, List out) {
        if (msg.isNull()) {
            writeArrayHeader(allocator, msg.isNull(), RedisConstants.NULL_VALUE, out);
        } else {
            writeArrayHeader(allocator, msg.isNull(), msg.children().size(), out);
            for (RedisMessage child : msg.children()) {
                writeRedisMessage(allocator, child, out);
            }
        }
    }

    private void writeArrayHeader(ByteBufAllocator allocator, boolean isNull, long length, List out) {
        if (isNull) {
            final ByteBuf buf = allocator.ioBuffer(RedisConstants.TYPE_LENGTH + RedisConstants.NULL_LENGTH +
                                                   RedisConstants.EOL_LENGTH);
            RedisMessageType.ARRAY_HEADER.writeTo(buf);
            buf.writeShort(RedisConstants.NULL_SHORT);
            buf.writeShort(RedisConstants.EOL_SHORT);
            out.add(buf);
        } else {
            final ByteBuf buf = allocator.ioBuffer(RedisConstants.TYPE_LENGTH + RedisConstants.LONG_MAX_LENGTH +
                                                   RedisConstants.EOL_LENGTH);
            RedisMessageType.ARRAY_HEADER.writeTo(buf);
            buf.writeBytes(numberToBytes(length));
            buf.writeShort(RedisConstants.EOL_SHORT);
            out.add(buf);
        }
    }

    private byte[] numberToBytes(long value) {
        byte[] bytes = messagePool.getByteBufOfInteger(value);
        return bytes != null ? bytes : RedisCodecUtil.longToAsciiBytes(value);
    }
}
    
    
    
    

    




    
    
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