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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;
/**
* Serializes a log message to Logstash Event Format
*
* @see https://www.elastic.co/products/logstash
* @see https://github.com/elastic/logstash/blob/master/logstash-core/src/main/java/org/logstash/Event.java
*
* @author Tim Mower <timothy.mower@gmail.com>
*/
class LogstashFormatter extends NormalizerFormatter
{
/**
* @var string the name of the system for the Logstash log message, used to fill the @source field
*/
protected $systemName;
/**
* @var string an application name for the Logstash log message, used to fill the @type field
*/
protected $applicationName;
/**
* @var string the key for 'extra' fields from the Monolog record
*/
protected $extraKey;
/**
* @var string the key for 'context' fields from the Monolog record
*/
protected $contextKey;
/**
* @param string $applicationName The application that sends the data, used as the "type" field of logstash
* @param string|null $systemName The system/machine name, used as the "source" field of logstash, defaults to the hostname of the machine
* @param string $extraKey The key for extra keys inside logstash "fields", defaults to extra
* @param string $contextKey The key for context keys inside logstash "fields", defaults to context
*/
public function __construct(string $applicationName, ?string $systemName = null, string $extraKey = 'extra', string $contextKey = 'context')
{
// logstash requires a ISO 8601 format date with optional millisecond precision.
parent::__construct('Y-m-d\TH:i:s.uP');
$this->systemName = $systemName === null ? gethostname() : $systemName;
$this->applicationName = $applicationName;
$this->extraKey = $extraKey;
$this->contextKey = $contextKey;
}
/**
* {@inheritdoc}
*/
public function format(array $record): string
{
$record = parent::format($record);
if (empty($record['datetime'])) {
$record['datetime'] = gmdate('c');
}
$message = [
'@timestamp' => $record['datetime'],
'@version' => 1,
'host' => $this->systemName,
];
if (isset($record['message'])) {
$message['message'] = $record['message'];
}
if (isset($record['channel'])) {
$message['type'] = $record['channel'];
$message['channel'] = $record['channel'];
}
if (isset($record['level_name'])) {
$message['level'] = $record['level_name'];
}
if (isset($record['level'])) {
$message['monolog_level'] = $record['level'];
}
if ($this->applicationName) {
$message['type'] = $this->applicationName;
}
if (!empty($record['extra'])) {
$message[$this->extraKey] = $record['extra'];
}
if (!empty($record['context'])) {
$message[$this->contextKey] = $record['context'];
}
return $this->toJson($message) . "\n";
}
}