friendica/src/Util/Logger/SyslogLogger.php
2021-03-29 08:45:21 +02:00

226 lines
6.3 KiB
PHP

<?php
/**
* @copyright Copyright (C) 2010-2021, the Friendica project
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
namespace Friendica\Util\Logger;
use Friendica\Network\HTTPException\InternalServerErrorException;
use Friendica\Util\Introspection;
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;
/**
* A error message of the current operation
* @var string
*/
private $errorMessage;
/**
* {@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(sprintf('The level "%s" is not valid.', $level));
}
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, $message)
{
set_error_handler([$this, 'customErrorHandler']);
$opened = openlog(self::IDENT, $this->logOpts, $this->logFacility);
restore_error_handler();
if (!$opened) {
throw new \UnexpectedValueException(sprintf('Can\'t open syslog for ident "%s" and facility "%s": ' . $this->errorMessage, $this->channel, $this->logFacility));
}
$this->syslogWrapper($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 .= $this->jsonEncodeArray($context) . ' - ';
$logMessage .= $this->jsonEncodeArray($record);
return $logMessage;
}
private function customErrorHandler($code, $msg)
{
$this->errorMessage = preg_replace('{^(fopen|mkdir)\(.*?\): }', '', $msg);
}
/**
* A syslog wrapper to make syslog functionality testable
*
* @param int $level The syslog priority
* @param string $entry The message to send to the syslog function
*/
protected function syslogWrapper($level, $entry)
{
set_error_handler([$this, 'customErrorHandler']);
$written = syslog($level, $entry);
restore_error_handler();
if (!$written) {
throw new \UnexpectedValueException(sprintf('Can\'t write into syslog for ident "%s" and facility "%s": ' . $this->errorMessage, $this->channel, $this->logFacility));
}
}
}