[Unit]
# Description is a human-readable name for the service.
Description=Greenlight API service

# Wait until PostgreSQL is running and the network is "up" before starting the service.
After=postgresql.service
After=network-online.target
Wants=network-online.target

# Configure service start rate limiting. If the service is (re)started more than 5 times 
# in 600 seconds then don't permit it to start anymore.
StartLimitIntervalSec=600
StartLimitBurst=5

[Service]
# Execute the API binary as the greenlight user, loading the environment variables from
# /etc/environment and using the working directory /home/greenlight.
Type=exec
User=greenlight
Group=greenlight
EnvironmentFile=/etc/environment
WorkingDirectory=/home/greenlight
ExecStart=/home/greenlight/api -port=4000 -db-dsn=${GREENLIGHT_DB_DSN} -env=production

# Automatically restart the service after a 5-second wait if it exits with a non-zero 
# exit code. If it restarts more than 5 times in 600 seconds, then the rate limit we
# configured above will be hit and it won't be restarted anymore.
Restart=on-failure
RestartSec=5

[Install]
# Start the service automatically at boot time (the 'multi-user.target' describes a boot
# state when the system will accept logins).
WantedBy=multi-user.target