| /* |
| * 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.ignite.internal.client.proto; |
| |
| import java.util.Arrays; |
| import io.netty.buffer.ByteBuf; |
| import io.netty.channel.ChannelHandlerContext; |
| import io.netty.handler.codec.LengthFieldBasedFrameDecoder; |
| import io.netty.util.CharsetUtil; |
| import org.apache.ignite.lang.IgniteException; |
| |
| import static org.apache.ignite.internal.client.proto.ClientMessageCommon.HEADER_SIZE; |
| import static org.apache.ignite.internal.client.proto.ClientMessageCommon.MAGIC_BYTES; |
| |
| /** |
| * Decodes full client messages: |
| * 1. MAGIC for first message. |
| * 2. Payload length (4 bytes). |
| * 3. Payload (N bytes). |
| */ |
| public class ClientMessageDecoder extends LengthFieldBasedFrameDecoder { |
| /** Magic decoded flag. */ |
| private boolean magicDecoded; |
| |
| /** Magic decoding failed flag. */ |
| private boolean magicFailed; |
| |
| /** |
| * Constructor. |
| */ |
| public ClientMessageDecoder() { |
| super(Integer.MAX_VALUE - HEADER_SIZE, 0, HEADER_SIZE, 0, HEADER_SIZE, true); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override protected Object decode(ChannelHandlerContext ctx, ByteBuf in) throws Exception { |
| if (!readMagic(in)) |
| return null; |
| |
| return super.decode(ctx, in); |
| } |
| |
| /** |
| * Checks the magic header for the first message. |
| * |
| * @param byteBuf Buffer. |
| * @return {@code true} when magic header has been received and is valid, {@code false} otherwise. |
| * @throws IgniteException When magic is invalid. |
| */ |
| private boolean readMagic(ByteBuf byteBuf) { |
| if (magicFailed) |
| return false; |
| |
| if (magicDecoded) |
| return true; |
| |
| if (byteBuf.readableBytes() < MAGIC_BYTES.length) |
| return false; |
| |
| var data = new byte[MAGIC_BYTES.length]; |
| byteBuf.readBytes(data); |
| |
| magicDecoded = true; |
| |
| if (Arrays.equals(data, MAGIC_BYTES)) |
| return true; |
| |
| magicFailed = true; |
| |
| throw new IgniteException("Invalid magic header in thin client connection. " + |
| "Expected 'IGNI', but was '" + new String(data, CharsetUtil.US_ASCII) + "'."); |
| } |
| } |