Tuesday, 3 November 2020

@Google-cloud/storage suddenly throwing weird exception after working for a long time

Context:

I have an API endpoint which serves .stl files stored in a public Google Cloud Storage bucket. Until sometime this week, it was working fine. I can step all the way through my code with the debugger. The NPM module in question is not even referenced in my project. I've tried using the exact code on Googles documentation for download and get the same exception: https://github.com/googleapis/nodejs-storage/blob/master/samples/downloadFile.js

What I've tried

npm rebuild @google-cloud/storage and different ways of using the same Google npm package.

Questions:

1.) Shouldn't the catch, catch the exception to prevent the crash?

2.) Anyone have any ideas on a workaround?

File: https://storage.cloud.google.com/fancy_induction_ui/1inX1in.stl

Code:

  getFile: async (req, res) => {
    try {
      const fileName = req.param('file');
      res.setHeader('Content-Type', 'application/octet-stream');
      res.setHeader('Content-Disposition', 'attachment; filename=' + fileName + '');
      const storage = new Storage();
      let file = await storage.bucket('fancy_induction_ui').file(fileName).createReadStream();
      file.pipe(res);
    } catch (e) {
      res.status(500).json({message: 'Something is wrong!', err: e.message});
    }
  }

Stacktrace:

path/to/code/node_modules/readable-stream/lib/_stream_writable.js:317
  var isBuf = !state.objectMode && _isUint8Array(chunk);
                     ^

TypeError: Cannot read property 'objectMode' of undefined
    at DestroyableTransform.Writable.write (path/to/code/node_modules/readable-stream/lib/_stream_writable.js:317:22)
    at PassThrough.ondata (_stream_readable.js:714:22)
    at PassThrough.emit (events.js:321:20)
    at PassThrough.EventEmitter.emit (domain.js:482:12)
    at PassThrough.Readable.read (_stream_readable.js:512:10)
    at flow (_stream_readable.js:989:34)
    at resume_ (_stream_readable.js:970:3)
    at processTicksAndRejections (internal/process/task_queues.js:84:21)


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