WIP Downloading submissions v1

[nicomy]

@ mention of reviewers

@Didayolo

Issue resolved

• 1232

Description

The aim of this PR is to add the feature of downloading all or several submissions at once. This bulk downloading is only accessible for a challenge administrator and is accessible through the submissions manager.

The user interface view could be improved by placing the drop down menu and apply button on the far right.

This implementation can(/should?) be improved by moving the zip_generator task computation from the django thread to a site-worker by un-commenting # in_memory_zip = stream_batch_download.apply_async((pks,)).get() and commenting in_memory_zip = stream_batch_download(pks) in the file submissions.py line 327.

However, generating zip in a stream by a site-worker is not functional because Celery back end is not configured to return something. This is a part where I would need help if this implementation is mandatory. Also, is there a good way to benchmark the cost of this feature on the Django thread? It should not block the responsiveness of Codabench.

The global implementation follows this path :

A checklist for hand testing

• [ ] Download all / selected submissions
• [ ] Delete selected submissions
• [ ] Re-run selected submissions

Checklist

• [X] Code review by me
• [X] Hand tested by me
• [X] I'm proud of my work
• [ ] Code review by reviewer
• [ ] Hand tested by reviewer
• [ ] CircleCi tests are passing
• [ ] Ready to merge

[Didayolo]

Thank you very much for your contribution. We'll review it as soon as possible.