I'm starting to port over the functionality that was previously just,
me running `yarn db:export:public-data` in `impress-2020` and
committing it to Git LFS every time.
My immediate motivation is that the `impress-2020` git repository is
getting weirdly large?? Idk how these 40MB files have blown up to a
solid 16GB of Git LFS data (we don't have THAT many!!!), but I guess
there's something about Git LFS's architecture and disk usage that I'm
not understanding.
So, let's move to a simpler system in which we don't bind the public
data to the codebase, but instead just regularly dump it in production
and make it available for download.
This change adds the `rails public_data:commit` task, which when run in
production will make the latest available at
`https://impress.openneo.net/public-data/latest.sql.gz`, and will also
store a running log of previous dumps, viewable at
`https://impress.openneo.net/public-data/`.
Things left to do:
1. Create a `rails public_data:pull` task, to download `latest.sql.gz`
and import it into the local development database.
2. Set up a cron job to dump this out regularly, idk maybe weekly? That
will grow, but not very fast (about 2GB per year), and we can add
logic to rotate out old ones if it starts to grow too far. (If we
wanted to get really intricate, we could do like, daily for the past
week, then weekly for the past 3 months, then monthly for the past
year, idk. There must be tools that do this!)
As the comment in `deploy.yml` explains, this was a multi-step process,
but it went very smoothly as planned, hooray!!
I noticed again while making this change that Bundler doesn't seem to
be availing itself of the checked-in dependencies in `vendor/cache`. I
think I know the fix for this, I'll toss it into an upcoming change and
see if it works!
The homepage used to point to old projects that don't work anymore
anyway! This is the only project that stuck, so just redirect here!
We also remove the openneo.net link from the footer, because there's
nothing useful to say there anymore!
It's finally colocated onto this box, instead of being on the old
server! I think I'm noticing substantial perf improvements, probably
both from increased colocation (tho they were in the same house
before), and also from like ten years of performance optimizations LOL!
As part of this, I created a new `setup_secrets.yml` file that's
similar to `production.env`, but is for values that the setup script
itself needs access to, whereas `production.env` is for values that the
app needs at runtime. (Though they have some things in common, like the
MySQL user password!) It's gitignored for security, as per usual!
Today I learned that nginx requires a special invocation to listen to
IPv6 addresses as well as IPv4. On some of my other projects, this was
causing Let's Encrypt certificate renewal to fail, because Let's
Encrypt prefers to connect over IPv6 when an AAAA record is present, so
its challenges were always returning 404, because nginx wasn't
listening on IPv6.
This shouldn't be affecting impress in production, because we don't
have an AAAA record right now. But I'm just making this change in all
my projects, to make sure this doesn't bite me in the future!
Been wanting this for a while in theory, gonna actually do it now!
The motivation is that I want to turn up the timeout for loading pets,
because the Neopets endpoints are slower today with the NC UC release -
but I can already predict that under our current architecture that will
be a problem, because it'll block up our request queue!
Falcon uses Ruby's relatively-new async system to *not* have requests
block on upstream requests, and my understanding is that this behavior
is plug-and-play. Let's see how it goes!
I did a pretty thorough reset of my desktop machine, and rather than go
spelunking for the same private key, I just rolled it over to a new
one. Let's set it up!
Well, sitting at the `MemoryHigh` limit still grinds the app to a halt
anyway, lmao. I guess it's a feature designed for well-behaved processes
and not for outright leaking ones?
Let's try just having systemd basically reset the app regularly when the
RAM hits a certain threshold. I think that's what this config will do,
we'll find out!
Lol ok, as I had kinda predicted, the memory bounds I set last time
were not tight enough, and it stalled out again! (It was at 75% and
fully just not working.)
Let's try this tighter bound instead!
So, Dependabot correctly reported that this version of puma is
vulernable, which I fixed in the main app already—but I didn't notice we
also use that version in this cute tiny placeholder app we use early in
the deployment process.
There's not a real security need to upgrade this, as this placeholder
app has no access to useful data when it is run, but I think it's better
to resolve this by fixing it than by silencing Dependabot! May as well!
I just restarted the impress app in production! First I logged in to see
why it wasn't responding, and I saw that there was almost no free RAM
left, and that the Rails app had grown to eat it all up!
So in this change, we set a memory limit: if the impress app is taking
up more than 75% of the machine's RAM, systemctl will try to shrink it
down; if it can't, then it will kill the app at 80%.
I'm not totally sure whether these bounds are tight enough? I didn't
look closely enough at the numbers to see what the app's actual usage
was according to systemctl at the time (`sudo systemctl status
impress`), so my hope is this is enough. But if we run into a memory
leak crash like that again, because it turns out even existing at 75%
RAM freezes the machine when running alongside its other processes, we
can decrease these numbers!
I also don't know the nature of the memory leak, and that could be worth
investigating—the app pretty cleanly fits into ~500–600MB when it starts
up, but then does seem to slowly but steadily grow. If it could be kept
at that size, it's possible we could downgrade the server and save some
costs—but that's a question for another day, since making sure we handle
memory leaks when they *do* happen is a more important robustness fix!
Rails already creates little pre-gzipped `.gz` copies of all our assets
in the `public/assets` directory when we build. This configures nginx to
send those when available!
We weren't doing *any* gzip stuff before, so this helps a lot with those
bigger JS files, like the `wardrobe-2020` stuff. It's now at ~.5MB with
compression, which is still a bit big, but nowhere near as offensive as
the 4.5MB pre-anything, or 1.5MB post-minification, lol.
Yay it's working! We set up the box, install Ruby, upload a placeholder app, set it up as a service, and get it hooked up to nginx!
Next, we'll add the script to upload the latest version of the site. We just need to slot it into `/srv/impress/current`, run `bundle install`, and that should basically be that! (Oh, and we need to compile production assets—I wonder if it's useful to do that on the dev machine instead of on the target? That might save us from needing to install Node. Or maybe we'll have to anyway!)
