getIndexFilename example

throw new \RuntimeException(sprintf('Please check your configuration. You are trying to use FileStorage with an invalid dsn "%s". The expected format is "file:/path/to/the/storage/folder".', $dsn));
        }
        $this->folder = substr($dsn, 5);

        if (!is_dir($this->folder) && false === @mkdir($this->folder, 0777, true) && !is_dir($this->folder)) {
            throw new \RuntimeException(sprintf('Unable to create the storage directory (%s).', $this->folder));
        }
    }

    public function find(?string $ip, ?string $url, ?int $limit, ?string $method, int $start = null, int $end = null, string $statusCode = null): array
    {
        $file = $this->getIndexFilename();

        if (!file_exists($file)) {
            return [];
        }

        $file = fopen($file, 'r');
        fseek($file, 0, \SEEK_END);

        $result = [];
        while (\count($result) < $limit && $line = $this->readLineFromFile($file)) {
            $values = str_getcsv($line);

            

throw new \RuntimeException(sprintf('Please check your configuration. You are trying to use FileStorage with an invalid dsn "%s". The expected format is "file:/path/to/the/storage/folder".', $dsn));
        }
        $this->folder = substr($dsn, 5);

        if (!is_dir($this->folder) && false === @mkdir($this->folder, 0777, true) && !is_dir($this->folder)) {
            throw new \RuntimeException(sprintf('Unable to create the storage directory (%s).', $this->folder));
        }
    }

    public function find(?string $ip, ?string $url, ?int $limit, ?string $method, int $start = null, int $end = null, string $statusCode = null): array
    {
        $file = $this->getIndexFilename();

        if (!file_exists($file)) {
            return [];
        }

        $file = fopen($file, 'r');
        fseek($file, 0, \SEEK_END);

        $result = [];
        while (\count($result) < $limit && $line = $this->readLineFromFile($file)) {
            $values = str_getcsv($line);