Error handling when uploading files

[petricf]

Platform

ESP32

IDE / Tooling

Arduino (IDE/CLI)

What happened?

How to handle errors in this process like:

• File name too long
• File size too big
• ...

How to abort the upload process ?

Stack Trace

Documentation issue

Minimal Reproductible Example (MRE)

In setup:
server.on ("/upload", HTTP_POST, handleUpload, handkeData);

In code (see comments in the text below):

  void (AsyncWebServerRequest * request) {
    request->redirect (200, "plain/text", "OK");
  }

  void handleData (AsyncWebServerRequest * request, String fileName, size_t index, uint8_t * data, size_t len, bool final) {
     if (!index)
      request->_tempFile = LittleFS.open (fileName);   // what to do if this fails (file name too long, ...) ???

    if (len)
      request->_tempFile.write (data, len);   // what to do if we run out of space ???

    if (final)
      request->_tempFile.close ();
}

I confirm that:

• I have read the documentation.
• I have searched for similar discussions.
• I have searched for similar issues.
• I have looked at the examples.
• I have upgraded to the lasted version of ESPAsyncWebServer (and AsyncTCP for ESP32).