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LogstashFormatter.php
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LogstashFormatter.php
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<?php
namespace MediaWiki\Logger\Monolog;
/**
* Modified version of Monolog\Formatter\LogstashFormatter
*
* - Squash the base message array, the context and extra subarrays into one.
* This can result in unfortunately named context fields overwriting other data (T145133).
* - Improve exception JSON-ification, which is done poorly by the standard class.
*
* @since 1.29
* @ingroup Debug
*/
class LogstashFormatter extends \Monolog\Formatter\LogstashFormatter {
public const V0 = 0;
public const V1 = 1;
/** @var array Keys which should not be used in log context */
protected $reservedKeys = [
// from LogstashFormatter
'message', 'channel', 'level', 'type',
// from WebProcessor
'url', 'ip', 'http_method', 'server', 'referrer',
// from WikiProcessor
'host', 'wiki', 'reqId', 'mwversion',
// from config magic
'normalized_message',
];
/**
* @var int Logstash format version to use
*/
protected $version;
/**
* TODO: See T247675 for removing this override.
*
* @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 ''
* @param string $contextKey The key for context keys inside logstash "fields", defaults
* @param int $version The logstash format version to use, defaults to V0
* to ''
*/
public function __construct( string $applicationName, ?string $systemName = null,
string $extraKey = '', string $contextKey = 'ctxt_', $version = self::V0
) {
$this->version = $version;
parent::__construct( $applicationName, $systemName, $extraKey, $contextKey );
}
public function format( array $record ): string {
$record = \Monolog\Formatter\NormalizerFormatter::format( $record );
if ( $this->version === self::V1 ) {
$message = $this->formatV1( $record );
} elseif ( $this->version === self::V0 ) {
$message = $this->formatV0( $record );
} else {
$message = __METHOD__ . ' unknown version ' . $this->version;
}
return $this->toJson( $message ) . "\n";
}
/**
* Prevent key conflicts
* @param array $record
* @return array
*/
protected function formatV0( array $record ) {
if ( $this->contextKey !== '' ) {
return $this->formatMonologV0( $record );
}
$context = !empty( $record['context'] ) ? $record['context'] : [];
$record['context'] = [];
$formatted = $this->formatMonologV0( $record );
$formatted['@fields'] = $this->fixKeyConflicts( $formatted['@fields'], $context );
return $formatted;
}
/**
* Borrowed from monolog/monolog 1.25.3
* https://github.com/Seldaek/monolog/blob/1.x/src/Monolog/Formatter/LogstashFormatter.php#L87-L128
*
* @param array $record
* @return array
*/
protected function formatMonologV0( array $record ) {
if ( empty( $record['datetime'] ) ) {
$record['datetime'] = gmdate( 'c' );
}
$message = [
'@timestamp' => $record['datetime'],
'@source' => $this->systemName,
'@fields' => [],
];
if ( isset( $record['message'] ) ) {
$message['@message'] = $record['message'];
}
if ( isset( $record['channel'] ) ) {
$message['@tags'] = [ $record['channel'] ];
$message['@fields']['channel'] = $record['channel'];
}
if ( isset( $record['level'] ) ) {
$message['@fields']['level'] = $record['level'];
}
if ( $this->applicationName ) {
$message['@type'] = $this->applicationName;
}
if ( isset( $record['extra']['server'] ) ) {
$message['@source_host'] = $record['extra']['server'];
}
if ( isset( $record['extra']['url'] ) ) {
$message['@source_path'] = $record['extra']['url'];
}
if ( !empty( $record['extra'] ) ) {
foreach ( $record['extra'] as $key => $val ) {
$message['@fields'][$this->extraKey . $key] = $val;
}
}
if ( !empty( $record['context'] ) ) {
foreach ( $record['context'] as $key => $val ) {
$message['@fields'][$this->contextKey . $key] = $val;
}
}
return $message;
}
/**
* Prevent key conflicts
* @param array $record
* @return array
*/
protected function formatV1( array $record ) {
if ( $this->contextKey ) {
return $this->formatMonologV1( $record );
}
$context = !empty( $record['context'] ) ? $record['context'] : [];
$record['context'] = [];
$formatted = $this->formatMonologV1( $record );
return $this->fixKeyConflicts( $formatted, $context );
}
/**
* Borrowed mostly from monolog/monolog 1.25.3
* https://github.com/Seldaek/monolog/blob/1.25.3/src/Monolog/Formatter/LogstashFormatter.php#L130-165
*
* @param array $record
* @return array
*/
protected function formatMonologV1( array $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'];
}
// level -> monolog_level is new in 2.0
// https://github.com/Seldaek/monolog/blob/2.0.2/src/Monolog/Formatter/LogstashFormatter.php#L86-L88
if ( isset( $record['level'] ) ) {
$message['monolog_level'] = $record['level'];
}
if ( $this->applicationName ) {
$message['type'] = $this->applicationName;
}
if ( !empty( $record['extra'] ) ) {
foreach ( $record['extra'] as $key => $val ) {
$message[$this->extraKey . $key] = $val;
}
}
if ( !empty( $record['context'] ) ) {
foreach ( $record['context'] as $key => $val ) {
$message[$this->contextKey . $key] = $val;
}
}
return $message;
}
/**
* Rename any context field that would otherwise overwrite a message key.
*
* @param array $fields Fields to be sent to logstash
* @param array $context Copy of the original $record['context']
* @return array Updated version of $fields
*/
protected function fixKeyConflicts( array $fields, array $context ) {
foreach ( $context as $key => $val ) {
if (
in_array( $key, $this->reservedKeys, true ) &&
isset( $fields[$key] ) && $fields[$key] !== $val
) {
$fields['logstash_formatter_key_conflict'][] = $key;
$key = 'c_' . $key;
}
$fields[$key] = $val;
}
return $fields;
}
/**
* Use a more user-friendly trace format than Monolog\Formatter\NormalizerFormatter.
*
* @param \Throwable $e
* @param int $depth
* @return array
*/
protected function normalizeException( \Throwable $e, int $depth = 0 ) {
$data = [
'class' => get_class( $e ),
'message' => $e->getMessage(),
'code' => $e->getCode(),
'file' => $e->getFile() . ':' . $e->getLine(),
'trace' => \MWExceptionHandler::getRedactedTraceAsString( $e ),
];
$previous = $e->getPrevious();
if ( $previous ) {
$data['previous'] = $this->normalizeException( $previous );
}
return $data;
}
}

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