Repair Inscription Previews in Discord

[batcavekid]

Previously, posting links in Discord would preview the image or raw content.

Now it seems to show only the Ordinals logo as a placeholder.

Seen various filetypes, including png, which previously worked.

[raphjaph]

We changed that because it was too difficult to support all the different content types in preview. Maybe we can get that to work again.

[casey]

Taking screenshots would be a great option, and works for all content types. @huumn (creator of Stacker News) do you have advice on this? SN social media previews always so fresh ✨ Taking screenshots requires a headless browser, which can get heavy, so we should keep build time, binary size, dependency count, in mind. The site is so simple though that a pure-rust renderer may be an option. Although many of the previews do use JS.

[huumn]

You could inspect mime type and return the inscription as a preview in cases where it makes sense and fall back to something generic.

For SN I do run a headless chrome browser (puppeteer). It's very heavy/memory intensive. I have a global rate limit per server and have an expiring cache of screenshots in block storage. If there isn't a recent screenshot in the cache, I screenshot the page on the spot and stream it back as a png.

[batcavekid]

You could inspect mime type and return the inscription as a preview in cases where it makes sense and fall back to something generic.

This sounds perfect.