/**
 * Copyright 2019 Pinterest, Inc.
 *
 * Licensed 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 com.pinterest.singer.tools;

import java.util.Set;

import com.pinterest.singer.common.SingerSettings;
import com.pinterest.singer.kubernetes.KubeService;
import com.pinterest.singer.thrift.configuration.KubeConfig;
import com.pinterest.singer.thrift.configuration.SingerConfig;

/**
 * Simple command line tool for checking Pod IDs from kubernetes
 */
public class KubeServiceChecker {

  public static void main(String[] args) {
    if (args.length < 1) {
      System.out.println("Usage: KubeServiceChecker [singer_config_dir]");
    }
    SingerConfig singerConfig = new SingerConfig();
    singerConfig.setKubernetesEnabled(true);
    KubeConfig kubeConfig = new KubeConfig();
    kubeConfig.setPodLogDirectory(args[0]);
    singerConfig.setKubeConfig(kubeConfig);
    SingerSettings.setSingerConfig(singerConfig);

    KubeService service = KubeService.getInstance();
    try {
      Set<String> podUids = service.fetchPodNamesFromMetadata();
      for (String puid : podUids) {
        System.out.println(puid);
      }
    } catch (Exception e) {
      System.err.println("Failed to fetch Pod IDs. Reason:" + e.getMessage());
      e.printStackTrace();
      System.exit(-1);
    }
  }

}