Support for multi-part file uploads

Have you tested multi-part file uploads with this adapter? All attempts I’ve tried thus far cause the web request via postman to not respond and usually timeout after 5 minutes. I also usually see this log in the function portal editor:

2017-06-21T05:04:30.644 Microsoft.Azure.WebJobs.Host: Timeout value of 00:05:00 was exceeded by function: Functions.FileUpload.

I’ve tried using the multer middleware with both it’s memory storage as well as multer-azure to attempt to store uploads into azure blob storage. I’ve also tried using busboy directly with req.pipe(busboy) to no avail.

It’s likely there is a problem with my code (and I can give some examples of what I’m trying per the above) but wanted to verify if it should work before I spend too much more time on it.

Thanks.

[techniq]

It seems like the issue might be caused from azure-function-express’s IncomingMessage only being an EventEmitter and not a stream like express/node’s IncomingMessage.

[yvele]

@techniq do you think if we return the raw Buffer that may helps?

See in OutgoingMessage.js:

/**
 * @param {Object|string|Buffer} body Express/connect body object
 * @param {string} encoding
 * @returns {Object|string} Azure Function body
 */
function convertToBody(body, encoding) {
  // This may be removed on Azure Function native support for Buffer
  // https://github.com/Azure/azure-webjobs-sdk-script/issues/814
  // https://github.com/Azure/azure-webjobs-sdk-script/pull/781
  return Buffer.isBuffer(body)
    ? body.toString(encoding)
    : body;
}

Related to https://github.com/Azure/azure-webjobs-sdk-script/issues/814 and https://github.com/Azure/azure-webjobs-sdk-script/pull/781