Extracting image dimensions in the background

[jan....@gmail.com]

Hey Janko and team,

I have set up direct uploads to S3 with Shrine. This works great. Among others, I have the following plugins enabled:

Shrine.plugin :backgrounding

Shrine.plugin :store_dimensions 

Shrine.plugin :restore_cached_data

Correct me if I'm wrong but image dimensions extraction appears to be done synchronously. If I let the user bulk upload images via Uppy and then persist them all, this seems to be taking a long time.

What I'd like to do is perform image dimensions extraction asynchronously - I don't need the dimensions available for the cached file. If possible, I'd like to do that in the background when the file gets promoted to the store. Is there a way to do it? Maybe disabling store_dimensions plugin and defining a custom process(:store) block?

Many thanks!

P.S. also posted the question here.

[Janko Marohnić]

Correct me if I'm wrong but image dimensions extraction appears to be done synchronously. If I let the user bulk upload images via Uppy and then persist them all, this seems to be taking a long time.

This is exactly what the restore_cached_data plugin does – it extracts metadata from directly uploaded files on assignment.

If you want to extract metadata in the background, you can use the refresh_metadata plugin (which restore_cached_data plugin uses internally) to extract metadata explicitly.

  Shrine.plugin :refresh_metadata

You can then call UploadedFile#refresh_metadata! in the processing block for background promotion.

  process(:store) do |io, context|

    io.refresh_metadata!(context)

    # processing

    { original: io, **versions }

  end

Kind regards,
Janko

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[jan....@gmail.com]

Thank you, Janko, that worked wonderfully! I'll update my original Stack Overflow question.

Best,

Jan