uvicorn[standard] no longer works on arm v7 as of v0.18

[tedivm]

v0.18 switched from watchgod to watchfiles, which also adds a dependency to the rust toolchain since watchfiles relies on the rust notify crate.

For most systems this works fine. However, right now watchfiles will not compile on ARM v7 (it requires arm64). There isn't a workaround for this other than not installing watchfiles.

The uvicorn[standard] tag currently includes watchfiles regardless of the system architecture, so it fails to install on arm v7 systems.

My downstream project has a workaround- I'm simply using a full list of packages instead of the standard extras. I figured I'd bring this up though in case others ran into this issue, as I'm not sure how many people build for the simpler arm platforms.

[br3ndonland]

There isn't a workaround for this other than not installing watchfiles.

I definitely understand the pain point here. Adding Rust binary extensions introduces complications on various platforms and distributions, including ARM and Alpine.

Could you get them a PR with builds for ARM v7? They seem open to multi-arch builds (samuelcolvin/watchfiles#120).

I'm simply using a full list of packages instead of the standard extras

There's been a lot of discussion about lumping all the optional dependencies into uvicorn[standard]. It's not optimal, so your approach of installing the packages separately is probably the way to go for now.

Related:

• Use optional package installs. #219
• About `uvicorn[standard]` #1274
• Remove asgiref from minimal requirements #1460 (comment)

[tedivm]

So far watchfiles has been pretty open to PRs- they accepted one from me already so I could change the timeout period on reloads to allow Celery to finish existing jobs before actually reloading.

It looks like they did make an arm v7 variant, but it looks like pypi is failing to notice. I'll look into it some more.