Add a settings variable for static files

[kamilgregorczyk]

Hi, I'm using your middleware along with django admin and it works very well for css files but it doesn't seem to work with fonts and fonts.css. Could you maybe add a settings variable for a list of static files which would be always added to the Link header?

https://www.dropbox.com/s/hyoke5oe6q4tolh/Zrzut%20ekranu%202018-07-05%2015.10.00.png?dl=0

[skorokithakis]

Hmm, those seem to work fine for me... Can you look into this a bit more and maybe issue a PR?

[kamilgregorczyk]

It probably works for fonts in your case because you load them in block in html, django admin seems to prepare fonts.css on its own. I think that's why it skipps these files. A walkaround is fairly simple, just load fonts.css and fonts before django does in html.

[skorokithakis]

Ah, yes, the middleware scans for files in static tags, it won't find files that aren't wrapped in those tags. I'm not sure how the workaround works, since not every page includes a fonts.css.

[kamilgregorczyk]

My workaround of course has to be done on the "developer side".
But it could be useful to maybe have a const variable defined in settings file like

CLOUDFLARE_PUSH_ALWAYS_PUSHED_FILES [
    'static/fonts/bla.woff',
    'static/fonts/bla2.woff',
    'static/fonts/fonts.css',
]

[skorokithakis]

Ahh, I see what you mean now. Yes, that could work, although it feels a bit too specific. Maybe there can be a callback function that receives the complete list and can change it however it wants before pushing.

[kamilgregorczyk]

Why does it sound too specific?

• It would be empty as a default
• If devs want to have something always pushed then they could define it in their settings.file

[skorokithakis]

And if they need something never pushed, we'd need a CLOUDFLARE_PUSH_NEVER_PUSHED_FILES setting, etc. The function is more general.

[kamilgregorczyk]

Ah I get it, you want to have something like a preprocessor for a list of files, ok that is better.

something like :

CLOUDFLARE_PUSH_FILES_PREPROCESSOR = lambda files: files

But, with such method, is the existing filter method needed anymore?

[skorokithakis]

Yeah, the filter method would be a bit redundant, however it would stay because of backwards-compatibility. But yes, it's as you describe, a function that takes a list of all files to push and edits it however the user wants. The default is already there, it's something like lambda files: set(files)[:10].

[kamilgregorczyk]

Ok, should I or should you do it?

[skorokithakis]

I can do it, but it would probably go faster if you did. I don't currently have the testing setup, but I can review immediately if you want to submit a PR.

The function should run after urls = sort_urls(urls), and the default for it should be lambda urls: urls[10:]. The [10:] part should then be removed from line 70 (create_header_content), as we want to give users as much freedom as we can, while still not making them do lots of standard work (i.e. we should keep the deduplication/sorting lines).