| /* |
| * 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.drill.exec.store.druid.rest; |
| |
| import com.fasterxml.jackson.databind.ObjectMapper; |
| import com.fasterxml.jackson.databind.node.ArrayNode; |
| import com.fasterxml.jackson.databind.node.ObjectNode; |
| import org.apache.drill.common.exceptions.UserException; |
| import org.apache.drill.common.util.JacksonUtils; |
| import org.apache.drill.exec.store.druid.druid.DruidScanResponse; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import okhttp3.Response; |
| |
| import java.io.InputStream; |
| import java.util.ArrayList; |
| |
| public class DruidQueryClient { |
| |
| private static final Logger logger = LoggerFactory.getLogger(DruidQueryClient.class); |
| |
| private static final String QUERY_BASE_URI = "/druid/v2"; |
| private static final ObjectMapper mapper = JacksonUtils.createObjectMapper(); |
| |
| private final RestClient restClient; |
| private final String queryUrl; |
| |
| public DruidQueryClient(String brokerURI, RestClient restClient) { |
| queryUrl = brokerURI + QUERY_BASE_URI; |
| this.restClient = restClient; |
| logger.debug("Initialized DruidQueryClient with druidURL - {}", this.queryUrl); |
| } |
| |
| public DruidScanResponse executeQuery(String query) throws Exception { |
| logger.debug("Executing Query - {}", query); |
| |
| try (Response response = restClient.post(queryUrl, query)) { |
| if (!response.isSuccessful()) { |
| // TODO: Add a CustomErrorContext when this plugin is converted to EVF. |
| throw UserException |
| .dataReadError() |
| .message("Error executing druid query. HTTP request failed") |
| .addContext("Response code", response.code()) |
| .addContext("Response message", response.message()) |
| .build(logger); |
| } |
| |
| InputStream responseStream = response.body().byteStream(); |
| ArrayNode responses = mapper.readValue(responseStream, ArrayNode.class); |
| return parseResponse(responses); |
| } |
| } |
| |
| private DruidScanResponse parseResponse(ArrayNode responses) { |
| String segmentId = "empty"; |
| ArrayList<ObjectNode> events = new ArrayList<>(); |
| ArrayList<String> columns = new ArrayList<>(); |
| |
| if (responses.size() > 0) { |
| ObjectNode firstNode = (ObjectNode) responses.get(0); |
| segmentId = firstNode.get("segmentId").textValue(); |
| ArrayNode columnsNode = (ArrayNode) firstNode.get("columns"); |
| ArrayNode eventsNode = (ArrayNode) firstNode.get("events"); |
| for(int i=0;i < columnsNode.size(); i++) { |
| String column = columnsNode.get(i).textValue(); |
| columns.add(column); |
| } |
| for(int i=0;i < eventsNode.size(); i++) { |
| ObjectNode eventNode = (ObjectNode) eventsNode.get(i); |
| events.add(eventNode); |
| } |
| } |
| return new DruidScanResponse(segmentId, columns, events); |
| } |
| } |