Port parts.horse to the Quart ASGI framework

[nbraud]

Motivation

• Much simpler (52 insertions(+), 121 deletions(-), ignoring the unrelated, new dev script)
• Agnostic wrt. the choice of web frontend
  Presumably, this could even be run with hypercorn or equivalent exposed directly to the Internet.
• Supports async operation
  This is generally more efficient, and will make switching to an async search engine much easier.

Drive-by changes

All those were more-or-less necessary for me to be able to hack on :

• .gitignore __pycache__ directories
• bin: Make all scripts use /bin/sh and exit on error
• bin/start.sh: Do not assume Python 3.7
• bin/wait-for-elasticsearch.sh: Make curl actually silent unless $VERBOSE is set
• bin/index.sh: Honor $VERBOSE
• Add helper script to setup a throwaway ElasticSearch instance

Additionally, I made a few cleanups in lib.model.Part:

• gave get a more Pythonic interface (not throwing on non-existent part)
• removed the id method: it's just a dict access and unused outside that class
• added @staticmethod decorators where relevant
• simplified the all and to_dict methods

Missing things

• [x] Actually make Elasticsearch calls async
  That could be nice, I just didn't bother since I'm trying to yeet ES away.
• [x] Properly handle directories with static content.
  Currently, a 404 is returned for / or /parts (without index.html); this is very-much a blocking bug, IMO, and I'll fix that ASAP (I asked the Quart dev how to do it, since the documentation is rather unhelpful on that topic)

[duckinator]

@nbraud this looks really good so far! feel free to poke me on Signal if you want me to look at something. :heart:

[nbraud]

@duckinator I fixed most of the linting issues; the rest are things I didn't touch, except for one (no-else-return) where I weakly disagree with the linter and I'd leave it up to you whether to fix the linter's config.

[nbraud]

Regarding the test failure in CI, I suspect there's something very wonky going on:

ImportError: cannot import name 'cache' from 'functools'

PS: Nevermind, it seems functools.cache was introduced in Py3.9 >_>'

[AstraLuma]

... except for one (no-else-return) where I weakly disagree with the linter and I'd leave it up to you whether to fix the linter's config.

Totally agree with you there. It's a dumb rule.

[nbraud]

Found some little warts, will fix them ASAP.

Done :)

[nbraud]

@duckinator I ended up taking care of testing, in no small part thanks to Quart's testing howto... and it found me a bug in my last commit (where I tried to simplify the search template)

[duckinator]

bors r+

aaaaa thank you so much! :purple_heart:

[nbraud]

You are very welcome :purple_heart:

[bors[bot]]

Build succeeded:

• lint
• test