Function createLogMiddleware

apps/webuiapps/src/lib/logPlugin.ts:50–78

(logFile: string, fsModule: FsLike)

 * Accepts POST requests with LogBody JSON, appends formatted lines to logFile.
 */
export function createLogMiddleware(logFile: string, fsModule: FsLike) {
  const logDir = logFile.split('/').slice(0, -1).join('/');

  return (req: IncomingMessage, res: ServerResponse, _next: () => void) => {
    if (req.method !== 'POST') {
      res.writeHead(405);
      res.end();
      return;
    }

    const chunks: Buffer[] = [];
    req.on('data', (chunk: Buffer) => chunks.push(chunk));
    req.on('end', () => {
      try {
        const body: LogBody = JSON.parse(Buffer.concat(chunks).toString());
        const line = formatLogLine(body);
        if (!fsModule.existsSync(logDir)) {
          fsModule.mkdirSync(logDir, { recursive: true });
        }
        fsModule.appendFileSync(logFile, line + '\n', 'utf8');
        res.writeHead(204);
        res.end();
      } catch {
        res.writeHead(400);
        res.end();
      }
    });
  };
}