Avoiding making multiple requests of the info.json when using the same URL

[giacomomarchioro]

As @markpbaggett noticed it might occur that multiple requests to the same URL are done when using set_hwd_from_iiif helper for retrieving the info.json file of a IIIF resource and getting the width and the height of the image.

iiif-prezi3/iiif_prezi3/helpers/set_hwd_from_iiif.py

Line 25 in a3551e9

response = requests.get(url)

For instance this is used at least twice (at Canvas level and resource level) for each Canvas supporting image servers.

[glenrobson]

Would it be possible to pass a info.json into set_hwd_from_iiif in case this has been done out of band.

Also this method re-uses the info.json request rather than asking for it twice:

iiif-prezi3/iiif_prezi3/helpers/create_canvas_from_iiif.py

Line 28 in d536865

infoJson = body.set_hwd_from_iiif(url)

[markpbaggett]

@giacomomarchioro, another question that I've been thinking about that might be related to @glenrobson 's question.

Assuming that create_thumbnail_from_iiif() eventually gets approved and merged, it would be awesome to integrate this with the make_canvas_from_iiif() helper which also makes a request on the info.json. With what you've been working on with functools and lru_cache, what's the best way to store the request in memory or as Glen asks store and pass a cached request if the request has already occurred so that we only have to get the image info back once?