content: /*
   * 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.flink.streaming.connectors.pinot;
  
  import org.apache.flink.annotation.Internal;
  import org.apache.http.StatusLine;
  import org.apache.http.client.methods.*;
  import org.apache.http.entity.ContentType;
  import org.apache.http.entity.StringEntity;
  import org.apache.http.impl.client.CloseableHttpClient;
  import org.apache.http.impl.client.HttpClients;
  import org.apache.http.util.EntityUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.Closeable;
  import java.io.IOException;
  
  import static org.apache.flink.util.Preconditions.checkNotNull;
  
  /**
   * Helpers to interact with the Pinot controller via its public API.
   */
  @Internal
  public class PinotControllerHttpClient implements Closeable {
  
      private static final Logger LOG = LoggerFactory.getLogger(PinotControllerHttpClient.class);
      private final String controllerHostPort;
      private final CloseableHttpClient httpClient;
  
      /**
       * @param controllerHost Pinot controller's host
       * @param controllerPort Pinot controller's port
       */
      public PinotControllerHttpClient(String controllerHost, String controllerPort) {
          checkNotNull(controllerHost);
          checkNotNull(controllerPort);
          this.controllerHostPort = String.format("http://%s:%s", controllerHost, controllerPort);
          this.httpClient = HttpClients.createDefault();
      }
  
      /**
       * Issues a request to the Pinot controller API.
       *
       * @param request Request to issue
       * @return Api response
       * @throws IOException
       */
      private ApiResponse execute(HttpRequestBase request) throws IOException {
          ApiResponse result;
  
          try (CloseableHttpResponse response = httpClient.execute(request)) {
              String body = EntityUtils.toString(response.getEntity());
              result = new ApiResponse(response.getStatusLine(), body);
          }
  
          return result;
      }
  
      /**
       * Issues a POST request to the Pinot controller API.
       *
       * @param path Path to POST to
       * @param body Request's body
       * @return API response
       * @throws IOException
       */
      ApiResponse post(String path, String body) throws IOException {
          HttpPost httppost = new HttpPost(this.controllerHostPort + path);
          httppost.setEntity(new StringEntity(body, ContentType.APPLICATION_JSON));
          LOG.debug("Posting string entity {} to {}", body, path);
          return this.execute(httppost);
      }
  
      /**
       * Issues a GET request to the Pinot controller API.
       *
       * @param path Path to GET from
       * @return API response
       * @throws IOException
       */
      ApiResponse get(String path) throws IOException {
          HttpGet httpget = new HttpGet(this.controllerHostPort + path);
          LOG.debug("Sending GET request to {}", path);
          return this.execute(httpget);
      }
  
      /**
       * Issues a DELETE request to the Pinot controller API.
       *
       * @param path Path to issue DELETE request to
       * @return API response
       * @throws IOException
       */
      ApiResponse delete(String path) throws IOException {
          HttpDelete httpdelete = new HttpDelete(this.controllerHostPort + path);
          LOG.debug("Sending DELETE request to {}", path);
          return this.execute(httpdelete);
      }
  
      @Override
      public void close() throws IOException {
          httpClient.close();
      }
  
      /**
       * Helper class for wrapping Pinot controller API responses.
       */
      static class ApiResponse {
          public final StatusLine statusLine;
          public final String responseBody;
  
          ApiResponse(StatusLine statusLine, String responseBody) {
              this.statusLine = statusLine;
              this.responseBody = responseBody;
          }
      }
  }
  