Error: read ECONNRESET when resizing image in Storage

I’d like to resize an image stored in Firebase Storage with Firebase Functions.

Based on this example : https://github.com/firebase/functions-samples/blob/master/quickstarts/thumbnails/functions/index.js I try to write a function triggered by a Database event.

Here is the most interesting part of the code :

const gcs = require('@google-cloud/storage')();

...

const bucket = gcs.bucket('...appspot.com');
const originalFilepath = myObject.picture1Url;
const tempFilePath = '/tmp/myThumbnail';

console.log('1');

return bucket
    .file(originalFilepath)
    .download({
        destination: tempFilePath
    })
    .then(() => {

        console.log('2');

    });

Everything looks fine to me. However the code never go to the console.log(‘2’); and I get this error :

Error: read ECONNRESET
    at exports._errnoException (util.js:1026:11)
    at TCP.onread (net.js:569:26)

Does somebody know what could be the error?

Thank you

[nicolasgarnier]

Yes the issue is what @ahaverty described.

When you do this:

createThumbnail(1, ...);
createThumbnail(2, ...);
createThumbnail(3, ...);
...
return;

You are starting 3 asynchronous processes but you are returning right away. Therefore the instance gets shut down and your 3 createThumbnail don;t have time to complete.

Each of these returns a Promise. What you need to do is this instead:

const listOfAsyncJobs = [];
listOfAsyncJobs.push(createThumbnail(1, ...));
listOfAsyncJobs.push(createThumbnail(2, ...));
listOfAsyncJobs.push(createThumbnail(3, ...));
...
return Promise.all(listOfAsyncJobs); // This will ensure we wait for the end of the three aync tasks above.

[ValentinTaleb]

Thanks a lot. You have saved my day !