【Ambari2.7.3源码分析】Agent警报状态上报器AlertStatusReporter

1、初始化AlertStatusReporter（每5s上报一次）

AlertStatusReporter.init

2、查询要上报的alert

  def run(self):
    """
    Run an endless loop which reports all the alert statuses got from collector
    """
    if self.alert_reports_interval == 0:
      logger.warn("AlertStatusReporter is turned off. Some functionality might not work correctly.")
      return
    logger.info('=====gaofeng=====AlertStatusReporter===alert_definitions_cache=%s',self.alert_definitions_cache)
    logger.info('=====gaofeng=====AlertStatusReporter===reported_alerts=%s',self.reported_alerts)
    logger.info('=====gaofeng=====AlertStatusReporter===send_alert_changes_only=%s',self.send_alert_changes_only)

    while not self.stop_event.is_set():
      try:
        logger.info('=====gaofeng=====AlertStatusReporter===initializer_module.is_registered=%s', self.initializer_module.is_registered)

        if self.initializer_module.is_registered:
          # 需要这样做来删除删除的集群信息(例如ambaria -server reset)
          self.clean_not_existing_clusters_info()
          #获取自上次使用此方法以来收集的所有警报
          #调用。此方法将清除收集的警报。
          alerts = self.collector.alerts()
          logger.info('=====gaofeng=====AlertStatusReporter===alerts=%s', alerts)
          # 保存通过的所有警报的最后运行时间
          self.stale_alerts_monitor.save_executed_alerts(alerts)
          #get_changed_alerts：获取自上次成功向服务器报告后更改的警告报告
          #三目运算符
          alerts_to_send = self.get_changed_alerts(alerts) if self.send_alert_changes_only else alerts
          logger.info('=====gaofeng=====AlertStatusReporter===alerts_to_send=%s', alerts_to_send)

          if alerts_to_send and self.initializer_module.is_registered:
            #ALERTS_STATUS_REPORTS_ENDPOINT=/reports/alerts_status
            correlation_id = self.initializer_module.connection.send(message=alerts_to_send, destination=Constants.ALERTS_STATUS_REPORTS_ENDPOINT, log_message_function=AlertStatusReporter.log_sending)
            self.server_responses_listener.listener_functions_on_success[correlation_id] = lambda headers, message: self.save_results(alerts_to_send)

      except ConnectionIsAlreadyClosed: # server and agent disconnected during sending data. Not an issue
        pass
      except:
        logger.exception("Exception in AlertStatusReporter. Re-running it")

      self.stop_event.wait(self.alert_reports_interval)

    logger.info("AlertStatusReporter has successfully finished")

其中

2.1、获取alerts

获取自上次使用此方法以来收集的所有警报

 alerts = self.collector.alerts()

2.2、决定alerts_to_send

获取自上次成功向服务器报告后更改的警告报告get_changed_alerts，如果没有则就拿alert作为要上报的alerts_to_send

alerts_to_send = self.get_changed_alerts(alerts) if self.send_alert_changes_only else alerts

3、发送给ambari-server

对应的代码在ambari-server的/reports/alerts_status目录下（依据注解去寻找）

#ALERTS_STATUS_REPORTS_ENDPOINT=/reports/alerts_status
 orrelation_id = self.initializer_module.connection.send(message=alerts_to_send, destination=Constants.ALERTS_STATUS_REPORTS_ENDPOINT, log_message_function=AlertStatusReporter.log_sending)