Mail.php

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<?php

namespace Rsi\Fred\Log\Handler;

class Mail extends Html{

  public $threshold = \Rsi\Fred\Log::ERROR;
  public $interval = 60; //!< Minimal mail interval (minutes).
  public $deadline = 24 * 60; //!< Maximum mail interval (minutes).
  public $from = null; //!< Sender (defaults to default From address).
  public $to = null; //!< Send mail to this address (or array for multiple; defaults to default From address).
  public $subject = 'Log *'; //!< Subject for the mail (an asterisk is replaced with the host name).
  public $templateSkipped = '
    <tr><td colspan="2"><hr></td></tr>
    <tr><td class="skipped" colspan="2">Skipped * bytes</td><tr>';
    //!< Template when skipping (an asterisk is replaced with the number of bytes skipped).
  public $templateFile = __DIR__ . '/mail.html'; //!< File with mail template ([time], [host], [ip] of server, [index] and
    // [log] are replaced; empty or non-existent defaults to log only).

  protected function format($prio,$context){
    if(strlen($result = parent::format($prio,$context)) > $this->maxSize){
      $result = substr($result,0,$this->maxSize);
      $result = substr($result,0,strrpos($result,"</tr>\n<tr>") + 5);
    }
    return $result;
  }

  public function send(){
    $result = null;
    if($size = filesize($this->filename)) try{
      \Rsi\File::write($this->timeFilename,date('c'),0666);
      //index
      fseek($f = fopen($this->indexFilename,'r'),$skipped = max(0,filesize($this->indexFilename) - $this->maxSize));
      $index = fread($f,$this->maxSize);
      fclose($f);
      file_put_contents($this->indexFilename,null);
      if($skipped) $index = substr($index,strpos($index,"\n<tr"));
      //log
      fseek($f = fopen($this->filename,'r'),$skipped = max(0,$size - $this->maxSize));
      $log = fread($f,$this->maxSize);
      fclose($f);
      file_put_contents($this->filename,null);
      if($skipped){
        $log = str_replace('*',$skipped,$this->templateSkipped) . substr($log,$extra = strpos($log,"\n<tr"));
        $skipped += $extra;
      }
      if($log) $result = $this->_log->component('mail')->send(
        $this->from,
        $this->to ?: ini_get('sendmail_from'),
        str_replace('*',$host = \Rsi\Http::host(),$this->subject),
        strtr(\Rsi\File::read($this->templateFile),[
          '[time]' => date('Y-m-d H:i:s'),
          '[host]' => $host,
          '[ip]' => $_SERVER['SERVER_ADDR'] ?? gethostbyname($host),
          '[index]' => $index,
          '[log]' => $log
        ]) ?: $log,
        true
      );
    }
    catch(\Rsi\Fred\Exception $e){
      if($this->_log->fred->debug) throw $e;
      $result = false;
    }
    return $result;
  }

  public function add($prio,$message,$context){
    parent::add($prio,$message,$context);
    $age = time() - $this->_log->filemtime($this->timeFilename);
    if(
      (($prio >= $this->threshold) && ($prio < \Rsi\Fred\Log::CUSTOM) && ($age >= $this->interval * 60)) ||
      ($age > $this->deadline * 60)
    ) $this->send();
  }

  protected function getFilename(){
    if(!parent::getFilename()) $this->_filename = \Rsi\File::tempDir() . "maillog-{$this->name}.tmp";
    return $this->_filename;
  }

  protected function getTimeFilename(){
    return $this->filename . '.time';
  }

}