# /etc/systemd/system/cashumints-web.service
#
# The frontend is static: `output: 'static'` in astro.config.mjs, and the whole site is
# produced ahead of time. There is no frontend build to keep alive, so this unit is a
# build rather than a daemon — one shot of `pnpm build`, which compiles shared/, renders
# a social card per mint and prerenders every page from the live API. The daemon that
# hands the result out is cashumints-site.service.
#
# Run it after a deploy:
#     sudo systemctl start cashumints-web
#
# Mint pages are prerendered, so new mints and new review counts only appear at the
# next build; pair this with a .timer for the nightly rebuild. There is deliberately no
# [Install] section — a rebuild should be scheduled, not fired on every boot.

[Unit]
Description=Rebuild the cashumints.space static site
# Every page's data comes from the API over loopback, so the API has to be up.
# Requires= rather than Wants=: a dead API should abort the build, not replace a good
# site with an empty one.
Requires=cashumints.service
After=cashumints.service network-online.target
Wants=network-online.target

[Service]
Type=oneshot
User=cashumints
Group=cashumints
WorkingDirectory=/home/cashumints/CashuMints.space

# Where the published copy lands. Shared with the API and the site server, and created
# by systemd with this unit's ownership if it is not there yet.
StateDirectory=cashumints

Environment=NODE_ENV=production
# Where the build reaches the API. Must match PORT= in cashumints.service.
Environment=API_URL=http://127.0.0.1:8788
Environment=SITE_URL=https://cashumints.space
# Browser-facing origin. Empty means same origin: islands fetch /api/... and nginx
# forwards it. Set this only if the API ever moves to its own hostname. Declared here
# even though it is empty, because systemd's environment wins over .env — so what a
# production build emits cannot drift with an edit to that file.
Environment=PUBLIC_API_URL=

# After= orders the start; it does not wait for the port to accept connections. At boot
# the API is still opening its database and probing, so block until it reports healthy
# rather than letting the first fetch die on ECONNREFUSED. /api/health answers 503 until
# it is genuinely ready, and curl -f treats that as a failure, so the loop keeps waiting.
ExecStartPre=/usr/bin/timeout 90 /bin/sh -c 'until curl -sf -o /dev/null http://127.0.0.1:8788/api/health; do sleep 1; done'
# Check `which pnpm` on the host: a corepack or pnpm-home install sits outside /usr/bin,
# and systemd's PATH does not include it.
ExecStart=/usr/bin/pnpm build

# Publish, as a separate step from building.
#
# `astro build` empties dist before it writes, so the site server cannot read dist
# directly — a nightly rebuild would be a nightly minute of 404s. It serves this copy
# instead, and the copy is only touched once a build has succeeded: a failed build
# leaves the previous site up rather than replacing it with a half-written one, which is
# the same reason Requires=cashumints.service is above.
#
# --delay-updates stages the changed files and renames them in at the end, so the window
# where the tree is a mix of two builds is a rename rather than a whole transfer, and
# --delete-after keeps removals from landing before their replacements. Unchanged files
# — every hashed asset and card, which is nearly all of it — are not touched at all.
ExecStartPost=/usr/bin/rsync -a --delete-after --delay-updates web/dist/ /var/lib/cashumints/web/

# ~200 prerendered pages plus a card per mint. Minutes, not seconds, on a small VPS, and
# TimeoutStartSec is what bounds a Type=oneshot.
TimeoutStartSec=1800
# A nightly rebuild should not starve the API it is reading from.
Nice=10

# The site server runs as cashumints and reads its own files, so this no longer has to
# be world-readable — it was 0022 for nginx, back when nginx opened the files as
# www-data. Kept at 0022 anyway: rsync preserves these modes into the published copy,
# and a readable static site is easier to inspect than one that needs sudo.
UMask=0022

NoNewPrivileges=true
PrivateTmp=true
PrivateDevices=true
# ProtectHome is deliberately absent, unlike in cashumints.service: this unit writes
# inside /home/cashumints — web/dist, web/public/og, web/src/generated and the pnpm
# store are all under it.
ProtectSystem=full
ProtectKernelTunables=true
ProtectKernelModules=true
ProtectControlGroups=true
RestrictAddressFamilies=AF_UNIX AF_INET AF_INET6