Seldaek/monolog · error · RuntimeException

Failed to open file for reading and writing: {path}

Error message

Failed to open file for reading and writing: {path}

What it means

Error "Failed to open file for reading and writing: {path}" thrown in Seldaek/monolog.

Source

Thrown at src/Monolog/Handler/DeduplicationHandler.php:155

    /**
     * @return string The given record serialized as a single line of text
     */
    protected function buildDeduplicationStoreEntry(LogRecord $record): string
    {
        return $record->datetime->getTimestamp() . ':' . $record->level->getName() . ':' . preg_replace('{[\r\n].*}', '', $record->message);
    }

    private function collectLogs(): void
    {
        if (!file_exists($this->deduplicationStore)) {
            return;
        }

        $handle = fopen($this->deduplicationStore, 'rw+');

        if (false === $handle) {
            throw new \RuntimeException('Failed to open file for reading and writing: ' . $this->deduplicationStore);
        }

        if (false === flock($handle, LOCK_EX)) {
            fclose($handle);
            return;
        }
        $validLogs = [];

        $timestampValidity = time() - $this->time;

        while (!feof($handle)) {
            $log = fgets($handle);
            if (\is_string($log) && '' !== $log && substr($log, 0, 10) >= $timestampValidity) {
                $validLogs[] = $log;
            }
        }

        ftruncate($handle, 0);

View on GitHub (pinned to 57eb102834)

When it happens

Trigger: Thrown at src/Monolog/Handler/DeduplicationHandler.php:155 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of Seldaek/monolog@57eb102834 (2026-08-17). Data as JSON: /api/errors/20e09eac6a93c624. Report an issue: GitHub.