# Prod web process: gunicorn master + uvicorn ASGI workers, behind Caddy.
#
# `systemctl reload polylan-submitter` sends HUP to the gunicorn master: it
# keeps the :7777 socket open, boots new workers on the new code, then
# gracefully stops the old ones - no downtime. See deploy/systemd/deploy.sh.
#
# Installed to /etc/systemd/system/ by deploy.sh: when this file changed it
# does daemon-reload + a full restart (HUP keeps the old ExecStart args).

[Unit]
Description=PolyLAN submitter (gunicorn + uvicorn workers)
After=network.target

[Service]
Type=simple
Restart=always
RestartSec=1
User=root
WorkingDirectory=/home/caddy/polylan-submitter/polylan_submitter
# Relative to WorkingDirectory, loaded by settings.py via python-dotenv.
Environment="SETTINGS_ENV_FILE_LOCATION=polylan_submitter/.env"

# No --preload: with it, HUP re-forks from the already imported (old) code.
# --forwarded-allow-ips replaces daphne's --proxy-headers: trust
# X-Forwarded-* only from Caddy (local here).
ExecStart=/home/caddy/polylan-submitter/.venv/bin/gunicorn polylan_submitter.asgi:application \
    --worker-class uvicorn_worker.UvicornWorker \
    --workers 2 \
    --bind 0.0.0.0:7777 \
    --graceful-timeout 20 \
    --forwarded-allow-ips 127.0.0.1
ExecReload=/bin/kill -s HUP $MAINPID

# SIGTERM to the master only, it then drains its workers (graceful-timeout).
KillMode=mixed
TimeoutStopSec=30

[Install]
WantedBy=multi-user.target