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<?php declare(strict_types=1);
/*
* This file is part of the Monolog package.
*
* (c) Jordi Boggiano <j.boggiano@seld.be>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Monolog\Formatter;
use Monolog\Logger;
use Gelf\Message;
use Monolog\Utils;
/**
* Serializes a log message to GELF
* @see http://docs.graylog.org/en/latest/pages/gelf.html
*
* @author Matt Lehner <mlehner@gmail.com>
*/
class GelfMessageFormatter extends NormalizerFormatter
{
protected const DEFAULT_MAX_LENGTH = 32766;
/**
* @var string the name of the system for the Gelf log message
*/
protected $systemName;
/**
* @var string a prefix for 'extra' fields from the Monolog record (optional)
*/
protected $extraPrefix;
/**
* @var string a prefix for 'context' fields from the Monolog record (optional)
*/
protected $contextPrefix;
/**
* @var int max length per field
*/
protected $maxLength;
/**
* Translates Monolog log levels to Graylog2 log priorities.
*/
private $logLevels = [
Logger::DEBUG => 7,
Logger::INFO => 6,
Logger::NOTICE => 5,
Logger::WARNING => 4,
Logger::ERROR => 3,
Logger::CRITICAL => 2,
Logger::ALERT => 1,
Logger::EMERGENCY => 0,
];
public function __construct(?string $systemName = null, ?string $extraPrefix = null, string $contextPrefix = 'ctxt_', ?int $maxLength = null)
{
parent::__construct('U.u');
$this->systemName = (is_null($systemName) || $systemName === '') ? gethostname() : $systemName;
$this->extraPrefix = is_null($extraPrefix) ? '' : $extraPrefix;
$this->contextPrefix = $contextPrefix;
$this->maxLength = is_null($maxLength) ? self::DEFAULT_MAX_LENGTH : $maxLength;
}
/**
* {@inheritdoc}
*/
public function format(array $record): Message
{
if (isset($record['context'])) {
$record['context'] = parent::format($record['context']);
}
if (isset($record['extra'])) {
$record['extra'] = parent::format($record['extra']);
}
if (!isset($record['datetime'], $record['message'], $record['level'])) {
throw new \InvalidArgumentException('The record should at least contain datetime, message and level keys, '.var_export($record, true).' given');
}
$message = new Message();
$message
->setTimestamp($record['datetime'])
->setShortMessage((string) $record['message'])
->setHost($this->systemName)
->setLevel($this->logLevels[$record['level']]);
// message length + system name length + 200 for padding / metadata
$len = 200 + strlen((string) $record['message']) + strlen($this->systemName);
if ($len > $this->maxLength) {
$message->setShortMessage(Utils::substr($record['message'], 0, $this->maxLength));
}
if (isset($record['channel'])) {
$message->setFacility($record['channel']);
}
if (isset($record['extra']['line'])) {
$message->setLine($record['extra']['line']);
unset($record['extra']['line']);
}
if (isset($record['extra']['file'])) {
$message->setFile($record['extra']['file']);
unset($record['extra']['file']);
}
foreach ($record['extra'] as $key => $val) {
$val = is_scalar($val) || null === $val ? $val : $this->toJson($val);
$len = strlen($this->extraPrefix . $key . $val);
if ($len > $this->maxLength) {
$message->setAdditional($this->extraPrefix . $key, Utils::substr($val, 0, $this->maxLength));
continue;
}
$message->setAdditional($this->extraPrefix . $key, $val);
}
foreach ($record['context'] as $key => $val) {
$val = is_scalar($val) || null === $val ? $val : $this->toJson($val);
$len = strlen($this->contextPrefix . $key . $val);
if ($len > $this->maxLength) {
$message->setAdditional($this->contextPrefix . $key, Utils::substr($val, 0, $this->maxLength));
continue;
}
$message->setAdditional($this->contextPrefix . $key, $val);
}
/** @phpstan-ignore-next-line */
if (null === $message->getFile() && isset($record['context']['exception']['file'])) {
if (preg_match("/^(.+):([0-9]+)$/", $record['context']['exception']['file'], $matches)) {
$message->setFile($matches[1]);
$message->setLine($matches[2]);
}
}
return $message;
}
}