/*
 * 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.
 */
#pragma once

#include <string>

#include "rocketmq/RocketMQ.h"

ROCKETMQ_NAMESPACE_BEGIN
struct HostInfo {
  std::string site_;
  std::string unit_;
  std::string app_;
  std::string stage_;

  explicit HostInfo();

  bool hasHostInfo() const;

  std::string queryString() const;

  static const char* ENV_LABEL_SITE;
  static const char* ENV_LABEL_UNIT;
  static const char* ENV_LABEL_APP;
  static const char* ENV_LABEL_STAGE;

private:
  static void getEnv(const char* env, std::string& holder);

  static void appendLabel(std::string& query_string, const char* key, const std::string& value);
};

ROCKETMQ_NAMESPACE_END