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Home php教程 PHP源碼 用PHP構(gòu)建一個(gè)簡(jiǎn)易監(jiān)視引擎(三)

用PHP構(gòu)建一個(gè)簡(jiǎn)易監(jiān)視引擎(三)

Jun 08, 2016 pm 05:33 PM
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五. 示例ServiceLogger進(jìn)程

  下面是一個(gè)示例ServiceLogger進(jìn)程。當(dāng)一個(gè)服務(wù)停用時(shí),它負(fù)責(zé)把一個(gè)電子郵件發(fā)送給一個(gè)待命人員:

class EmailMe_ServiceLogger implements ServiceLogger {
 public function log_service_event(ServiceCheck$service)
 {
  if($service->current_status ==ServiceCheck::FAILURE) {
   $message = "Problem with{$service->description()}rn";
   mail('oncall@example.com', 'Service Event',$message);
   if($service->consecutive_failures() > 5) {
    mail('oncall_backup@example.com', 'Service Event', $message);
   }
  }
 }
 public function log_current_status(ServiceCheck$service){
  return;
 }
}

  假如連續(xù)失敗五次,那么該進(jìn)程還把一個(gè)消息發(fā)送到一個(gè)備份地址。注重,它并沒(méi)有實(shí)現(xiàn)一個(gè)有意義的log_current_status()方法。

  無(wú)論何時(shí)象如下這樣改變一個(gè)服務(wù)的狀態(tài),你都應(yīng)該實(shí)現(xiàn)一個(gè)寫向PHP錯(cuò)誤日志的ServiceLogger進(jìn)程:

class ErrorLog_ServiceLogger implements ServiceLogger {
 public function log_service_event(ServiceCheck$service)
 {
  if($service->current_status() !==$service->previous_status()) {
   if($service->current_status() ===ServiceCheck::FAILURE) {
    $status = 'DOWN';
   }
   else {
    $status = 'UP';
   }
   error_log("{$service->description()} changed status to $status");
  }
 }
 public function log_current_status(ServiceCheck$service)
 {
  error_log("{$service->description()}: $status");
 }
}

  該log_current_status()方法意味著,假如進(jìn)程發(fā)送一個(gè)SIGUSR1信號(hào),它將把其完整的當(dāng)前狀態(tài)復(fù)制到你的PHP錯(cuò)誤日志中。
  
  該引擎使用如下的一個(gè)配置文件:


 
  
   errorlog
   ErrorLog_ServiceLogger
  

  
   emailme
   EmailMe_ServiceLogger
  

 

 
  
   HTTP_ServiceCheck
   
    OmniTI HTTP Check
    http://www.omniti.com
    30
    900
   

   
    errorlog
    emailme

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