| /* |
| * 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.tinkerpop.gremlin.server.handler; |
| |
| import io.netty.handler.codec.ReplayingDecoder; |
| import io.netty.util.CharsetUtil; |
| import org.apache.tinkerpop.gremlin.driver.MessageSerializer; |
| import org.apache.tinkerpop.gremlin.driver.message.RequestMessage; |
| import org.apache.tinkerpop.gremlin.driver.ser.SerializationException; |
| import io.netty.buffer.ByteBuf; |
| import io.netty.channel.ChannelHandlerContext; |
| import org.apache.tinkerpop.gremlin.driver.simple.WebSocketClient; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.List; |
| import java.util.Map; |
| |
| /** |
| * @author Stephen Mallette (http://stephen.genoprime.com) |
| * |
| * @deprecated As of release 3.3.10, not replaced, use {@link WebSocketClient}. |
| */ |
| @Deprecated |
| public class NioGremlinBinaryRequestDecoder extends ReplayingDecoder<NioGremlinBinaryRequestDecoder.DecoderState> { |
| private static final Logger logger = LoggerFactory.getLogger(NioGremlinBinaryRequestDecoder.class); |
| private final Map<String, MessageSerializer> serializers; |
| private int messageLength; |
| |
| public NioGremlinBinaryRequestDecoder(final Map<String, MessageSerializer> serializers) { |
| super(DecoderState.MESSAGE_LENGTH); |
| this.serializers = serializers; |
| } |
| |
| @Override |
| protected void decode(final ChannelHandlerContext channelHandlerContext, final ByteBuf byteBuf, final List<Object> objects) throws Exception { |
| switch (state()) { |
| case MESSAGE_LENGTH: |
| messageLength = byteBuf.readInt(); |
| checkpoint(DecoderState.MESSAGE); |
| case MESSAGE: |
| try { |
| final ByteBuf messageFrame = byteBuf.readBytes(messageLength); |
| final int contentTypeLength = messageFrame.readByte(); |
| final ByteBuf contentTypeFrame = messageFrame.readBytes(contentTypeLength); |
| final String contentType = contentTypeFrame.toString(CharsetUtil.UTF_8); |
| |
| // the default serializer to use has been GraphSON 1.0 to this point (which was probably bad), |
| // so maintain that for 3.3.x |
| final MessageSerializer serializer = select(contentType, ServerSerializers.DEFAULT_SERIALIZER); |
| |
| // it's important to re-initialize these channel attributes as they apply globally to the channel. in |
| // other words, the next request to this channel might not come with the same configuration and mixed |
| // state can carry through from one request to the next |
| channelHandlerContext.channel().attr(StateKey.SESSION).set(null); |
| channelHandlerContext.channel().attr(StateKey.SERIALIZER).set(serializer); |
| channelHandlerContext.channel().attr(StateKey.USE_BINARY).set(true); |
| |
| // subtract the contentTypeLength and the byte that held it from the full message length to |
| // figure out how long the rest of the message is |
| final int payloadLength = messageLength - 1 - contentTypeLength; |
| objects.add(serializer.deserializeRequest(messageFrame.readBytes(payloadLength))); |
| } catch (SerializationException se) { |
| objects.add(RequestMessage.INVALID); |
| } |
| |
| checkpoint(DecoderState.MESSAGE_LENGTH); |
| break; |
| default: |
| throw new Error("Invalid message sent to Gremlin Server"); |
| } |
| } |
| |
| public MessageSerializer select(final String mimeType, final MessageSerializer defaultSerializer) { |
| if (logger.isWarnEnabled() && !serializers.containsKey(mimeType)) |
| logger.warn("Gremlin Server is not configured with a serializer for the requested mime type [{}] - using {} by default", |
| mimeType, defaultSerializer.getClass().getName()); |
| |
| return serializers.getOrDefault(mimeType, defaultSerializer); |
| } |
| |
| public enum DecoderState { |
| MESSAGE_LENGTH, |
| MESSAGE |
| } |
| } |