friendica/src/Util/Logger/SyslogLogger.php
2019-03-22 23:13:25 -04:00

176 lines
4.7 KiB
PHP

<?php
namespace Friendica\Util\Logger;
use Friendica\Network\HTTPException\InternalServerErrorException;
use Friendica\Util\Introspection;
use Psr\Log\InvalidArgumentException;
use Psr\Log\LogLevel;
/**
* A Logger instance for syslogging (fast, but simple)
* @see http://php.net/manual/en/function.syslog.php
*/
class SyslogLogger extends AbstractLogger
{
const IDENT = 'Friendica';
/**
* Translates LogLevel log levels to syslog log priorities.
* @var array
*/
private $logLevels = [
LogLevel::DEBUG => LOG_DEBUG,
LogLevel::INFO => LOG_INFO,
LogLevel::NOTICE => LOG_NOTICE,
LogLevel::WARNING => LOG_WARNING,
LogLevel::ERROR => LOG_ERR,
LogLevel::CRITICAL => LOG_CRIT,
LogLevel::ALERT => LOG_ALERT,
LogLevel::EMERGENCY => LOG_EMERG,
];
/**
* Translates log priorities to string outputs
* @var array
*/
private $logToString = [
LOG_DEBUG => 'DEBUG',
LOG_INFO => 'INFO',
LOG_NOTICE => 'NOTICE',
LOG_WARNING => 'WARNING',
LOG_ERR => 'ERROR',
LOG_CRIT => 'CRITICAL',
LOG_ALERT => 'ALERT',
LOG_EMERG => 'EMERGENCY'
];
/**
* Indicates what logging options will be used when generating a log message
* @see http://php.net/manual/en/function.openlog.php#refsect1-function.openlog-parameters
*
* @var int
*/
private $logOpts;
/**
* Used to specify what type of program is logging the message
* @see http://php.net/manual/en/function.openlog.php#refsect1-function.openlog-parameters
*
* @var int
*/
private $logFacility;
/**
* The minimum loglevel at which this logger will be triggered
* @var int
*/
private $logLevel;
/**
* {@inheritdoc}
* @param string $level The minimum loglevel at which this logger will be triggered
* @param int $logOpts Indicates what logging options will be used when generating a log message
* @param int $logFacility Used to specify what type of program is logging the message
*
* @throws \Exception
*/
public function __construct($channel, Introspection $introspection, $level = LogLevel::NOTICE, $logOpts = LOG_PID, $logFacility = LOG_USER)
{
parent::__construct($channel, $introspection);
$this->logOpts = $logOpts;
$this->logFacility = $logFacility;
$this->logLevel = $this->mapLevelToPriority($level);
$this->introspection->addClasses(array(self::class));
}
/**
* Adds a new entry to the syslog
*
* @param int $level
* @param string $message
* @param array $context
*
* @throws InternalServerErrorException if the syslog isn't available
*/
protected function addEntry($level, $message, $context = [])
{
$logLevel = $this->mapLevelToPriority($level);
if ($logLevel > $this->logLevel) {
return;
}
$formattedLog = $this->formatLog($logLevel, $message, $context);
$this->write($logLevel, $formattedLog);
}
/**
* Maps the LogLevel (@see LogLevel ) to a SysLog priority (@see http://php.net/manual/en/function.syslog.php#refsect1-function.syslog-parameters )
*
* @param string $level A LogLevel
*
* @return int The SysLog priority
*
* @throws \Psr\Log\InvalidArgumentException If the loglevel isn't valid
*/
public function mapLevelToPriority($level)
{
if (!array_key_exists($level, $this->logLevels)) {
throw new InvalidArgumentException('LogLevel \'' . $level . '\' isn\'t valid.');
}
return $this->logLevels[$level];
}
/**
* Closes the Syslog
*/
public function close()
{
closelog();
}
/**
* Writes a message to the syslog
* @see http://php.net/manual/en/function.syslog.php#refsect1-function.syslog-parameters
*
* @param int $priority The Priority
* @param string $message The message of the log
*
* @throws InternalServerErrorException if syslog cannot be used
*/
private function write($priority, $message)
{
if (!openlog(self::IDENT, $this->logOpts, $this->logFacility)) {
throw new InternalServerErrorException('Can\'t open syslog for ident "' . $this->channel . '" and facility "' . $this->logFacility . '""');
}
syslog($priority, $message);
}
/**
* Formats a log record for the syslog output
*
* @param int $level The loglevel/priority
* @param string $message The message
* @param array $context The context of this call
*
* @return string the formatted syslog output
*/
private function formatLog($level, $message, $context = [])
{
$record = $this->introspection->getRecord();
$record = array_merge($record, ['uid' => $this->logUid]);
$logMessage = '';
$logMessage .= $this->channel . ' ';
$logMessage .= '[' . $this->logToString[$level] . ']: ';
$logMessage .= $this->psrInterpolate($message, $context) . ' ';
$logMessage .= @json_encode($context) . ' - ';
$logMessage .= @json_encode($record);
return $logMessage;
}
}