| /* |
| * 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.driver.handler; |
| |
| import io.netty.buffer.ByteBuf; |
| import io.netty.channel.ChannelHandler; |
| import io.netty.channel.ChannelHandlerContext; |
| import io.netty.handler.codec.MessageToMessageEncoder; |
| import io.netty.handler.codec.http.DefaultFullHttpRequest; |
| import io.netty.handler.codec.http.FullHttpRequest; |
| import io.netty.handler.codec.http.HttpHeaderNames; |
| import io.netty.handler.codec.http.HttpMethod; |
| import io.netty.handler.codec.http.HttpVersion; |
| import org.apache.tinkerpop.gremlin.driver.MessageSerializer; |
| import org.apache.tinkerpop.gremlin.driver.UserAgent; |
| import org.apache.tinkerpop.gremlin.driver.exception.ResponseException; |
| import org.apache.tinkerpop.gremlin.driver.message.RequestMessage; |
| import org.apache.tinkerpop.gremlin.driver.message.ResponseStatusCode; |
| import org.apache.tinkerpop.gremlin.driver.ser.SerTokens; |
| import org.apache.tinkerpop.gremlin.process.traversal.Bytecode; |
| |
| import java.util.List; |
| import java.util.function.UnaryOperator; |
| |
| /** |
| * Converts {@link RequestMessage} to a {@code HttpRequest}. |
| */ |
| @ChannelHandler.Sharable |
| public final class HttpGremlinRequestEncoder extends MessageToMessageEncoder<RequestMessage> { |
| private final MessageSerializer<?> serializer; |
| private final boolean userAgentEnabled; |
| private final UnaryOperator<FullHttpRequest> interceptor; |
| |
| @Deprecated |
| public HttpGremlinRequestEncoder(final MessageSerializer<?> serializer, final UnaryOperator<FullHttpRequest> interceptor) { |
| this.serializer = serializer; |
| this.interceptor = interceptor; |
| this.userAgentEnabled = true; |
| } |
| |
| public HttpGremlinRequestEncoder(final MessageSerializer<?> serializer, final UnaryOperator<FullHttpRequest> interceptor, boolean userAgentEnabled) { |
| this.serializer = serializer; |
| this.interceptor = interceptor; |
| this.userAgentEnabled = userAgentEnabled; |
| } |
| |
| @Override |
| protected void encode(final ChannelHandlerContext channelHandlerContext, final RequestMessage requestMessage, final List<Object> objects) throws Exception { |
| final String mimeType = serializer.mimeTypesSupported()[0]; |
| // only GraphSON3 and GraphBinary recommended for serialization of Bytecode requests |
| if (requestMessage.getArg("gremlin") instanceof Bytecode && |
| !mimeType.equals(SerTokens.MIME_GRAPHSON_V3D0) && |
| !mimeType.equals(SerTokens.MIME_GRAPHBINARY_V1D0)) { |
| throw new ResponseException(ResponseStatusCode.REQUEST_ERROR_SERIALIZATION, String.format( |
| "An error occurred during serialization of this request [%s] - it could not be sent to the server - Reason: only GraphSON3 and GraphBinary recommended for serialization of Bytecode requests, but used %s", |
| requestMessage, serializer.getClass().getName())); |
| } |
| |
| try { |
| final ByteBuf buffer = serializer.serializeRequestAsBinary(requestMessage, channelHandlerContext.alloc()); |
| final FullHttpRequest request = new DefaultFullHttpRequest(HttpVersion.HTTP_1_1, HttpMethod.POST, "/", buffer); |
| request.headers().add(HttpHeaderNames.CONTENT_TYPE, mimeType); |
| request.headers().add(HttpHeaderNames.CONTENT_LENGTH, buffer.readableBytes()); |
| request.headers().add(HttpHeaderNames.ACCEPT, mimeType); |
| if (userAgentEnabled) { |
| request.headers().add(HttpHeaderNames.USER_AGENT, UserAgent.USER_AGENT); |
| } |
| objects.add(interceptor.apply(request)); |
| } catch (Exception ex) { |
| throw new ResponseException(ResponseStatusCode.REQUEST_ERROR_SERIALIZATION, String.format( |
| "An error occurred during serialization of this request [%s] - it could not be sent to the server - Reason: %s", |
| requestMessage, ex)); |
| } |
| } |
| } |