GoogleCloudWithStackTraceLoggingFormatter.php

<?php declare(strict_types=1);

/*
 * This file is part of the Monolog package.
 *
 * (c) Jordi Boggiano <[email protected]>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace App;

use DateTimeInterface;
use Monolog\LogRecord;

/**
 * Encodes message information into JSON in a format compatible with Cloud logging.
 *
 * @see https://cloud.google.com/logging/docs/structured-logging
 * @see https://cloud.google.com/logging/docs/reference/v2/rest/v2/LogEntry
 *
 * @author Luís Cobucci <[email protected]>
 */
final class GoogleCloudWithStackTraceLoggingFormatter extends \Monolog\Formatter\JsonFormatter
{
    protected function normalizeRecord(LogRecord $record): array
    {
        $normalized = parent::normalizeRecord($record);

        //The base "normalizeRecord" also strips out the stack trace.  Here, we're putting it back in.
        if(array_key_exists('exception', $record['context'])) {
            $exception_rec = [
                'message' => $record['context']['exception']->getMessage(),
                'code' => $record['context']['exception']->getCode(),
                'file' => $record['context']['exception']->getFile(),
                'line' => $record['context']['exception']->getLine(),
                'trace' => $record['context']['exception']->getTrace(),
            ];
            $normalized['context']['exception'] = $exception_rec;
        }
        // Re-key level for GCP logging
        $normalized['severity'] = $normalized['level_name'];
        $normalized['time'] = $record->datetime->format(DateTimeInterface::RFC3339_EXTENDED);

        // Remove keys that are not used by GCP
        unset($normalized['level'], $normalized['level_name'], $normalized['datetime']);

        return $normalized;
    }
}