content: /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * 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.alibaba.nacos.prometheus.utils;
  
  import com.alibaba.nacos.api.naming.pojo.Instance;
  import com.alibaba.nacos.common.utils.JacksonUtils;
  import com.fasterxml.jackson.databind.node.ArrayNode;
  import com.fasterxml.jackson.databind.node.ObjectNode;
  
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  import java.util.stream.Collectors;
  
  import static java.util.stream.Collectors.groupingBy;
  
  /**
   * prometheus common utils.
   *
   * @author Joey777210
   */
  public class PrometheusUtils {
      
      /**
       * Assemble arrayNodes for prometheus sd api.
       */
      public static void assembleArrayNodes(Set<Instance> targetSet, ArrayNode arrayNode) {
          Map<String, List<Instance>> groupingInsMap = targetSet.stream().collect(groupingBy(Instance::getClusterName));
          groupingInsMap.forEach((key, value) -> {
              for (Instance instance : value) {
                  ObjectNode jsonNode = assembleInstanceToArrayNode(key, instance);
                  arrayNode.add(jsonNode);
              }
          });
      }
      
      /**
       * assemble instance to json node, and export metadata to label.
       *
       * @param clusterName the cluster name
       * @param instance    instance info
       */
      private static ObjectNode assembleInstanceToArrayNode(String clusterName, Instance instance) {
          
          ArrayNode targetsNode = JacksonUtils.createEmptyArrayNode();
          targetsNode.add(instance.getIp() + ":" + instance.getPort());
          ObjectNode labelNode = JacksonUtils.createEmptyJsonNode();
          //mark cluster name
          labelNode.put("__meta_clusterName", clusterName);
          //export metadata
          Map<String, String> metadata = instance.getMetadata();
          // auto convert label names contain with "." and "-" to "_"
          metadata = metadata.entrySet().stream().collect(Collectors.toMap(e -> e.getKey().replace(".", "_").replace("-", "_"), e -> e.getValue()));
          
          metadata.forEach(labelNode::put);
          ObjectNode jsonNode = JacksonUtils.createEmptyJsonNode();
          jsonNode.replace("targets", targetsNode);
          jsonNode.replace("labels", labelNode);
          return jsonNode;
      }
  }
  