Solar command caching

[alekm]

Bug description

Discord will cache images when produced from a URL, causing solar data images that can be days or weeks old.

Steps to reproduce

solar

Expected behaviour

Suspect serving an image the same way the svg images are gathered and producing with attachment:// would suffice with a realtime image instead of a cached image from the URL

How did you download qrm?

Git (clone)

How are you running qrm?

Docker

What qrm version are you running?

v2.7.4

Environment

No response

Logs

No response

Additional context, screenshots, etc

No response

[classabbyamp]

this is a known issue: #322

Sending a file is not optimal, because the time spent uploading the image is blocking, which is not great, especially for large images.

[alekm]

Can this be fixed by adding a timecode to the url? (e.g. https://www.hamqsl.com/solarsun.php?t=1648097678)

[classabbyamp]

hamqsl's images don't support giving any kind of timestamp in a way that affects the generated image (like the greyline map does), and adding a unique nonce just for discord doesn't work (see #308 and #318, especially #318 (comment)).

We've spent a while on this issue and the only reasonable solution seems to be making a small cdn/image proxy, which we haven't had time to implement yet.