# prerender server with pm2 and prerender-plugin-fscache (file system based so 
# resolves caching issues with pm2 and prerender-memory-cache)
#
# docker compose exec prerender pm2 monit

services:

  prerender:
    build: .
    image: ${IMAGE:-prerender}
    container_name: ${CONTAINER_NAME:-prerender} 
    user: node
    restart: unless-stopped
    init: true  # makes all the difference, no more timeout (not always) / restarts without chrome alive
    expose:
      - "3000"
      - "9222"   
    environment:
      - PATH=/home/node/node_modules/pm2/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
      - VIRTUAL_PORT=3000
      - VIRTUAL_HOST=${LETSENCRYPT_HOST}
      - LETSENCRYPT_HOST=${LETSENCRYPT_HOST}
      - LETSENCRYPT_EMAIL=${LETSENCRYPT_EMAIL}
      - LETSENCRYPT_TEST=${LETSENCRYPT_TEST:-false}
      - CHROME_LOCATION=/usr/bin/chromium
      - PAGE_LOAD_TIMEOUT=${PAGE_LOAD_TIMEOUT:-15000}  # was 3000: too tight for a cold SPA, prerender gave up with splash/empty DOM and (with TIMEOUT_STATUS_CODE unset) cached those partial renders as 200 for 24h
      # a timed-out render must NOT look like a success: 504 is not in CACHE_STATUS_CODES,
      # so partial snapshots are never written to the cache
      - TIMEOUT_STATUS_CODE=${TIMEOUT_STATUS_CODE:-504}
      - NODE_ENV=production
      - PHANTOM_WORKERS=${PHANTOM_WORKERS}  # legacy, ignored: instances is fixed to 1 (see ecosystem.config.js)
      # prerender-plugin-fscache to the rescue
      # only cache clean results, and only for 1h so any bad entry self-heals quickly
      # (404 was removed: a transient 404 used to be frozen for a full day)
      - CACHE_STATUS_CODES=${CACHE_STATUS_CODES:-200,301,302}
      - CACHE_TTL=${CACHE_TTL:-3600}
      - CACHE_PATH=/home/node/prerender-cache
      - CACHE_VOLUME=${CACHE_VOLUME:-prerender-cache}                          
    networks:
      letsencrypt:
      default:
    entrypoint: ["pm2-runtime", "start", "ecosystem.config.js"]
    logging:
      driver: "json-file"  
      options:
        max-size: "10m"
        max-file: "3"
    volumes:
      - ./ecosystem.config.js:/home/node/ecosystem.config.js
      - ./server.js:/home/node/server.js
      - prerender-cache:/home/node/prerender-cache   

networks:
  letsencrypt:
    external: true

volumes:
  prerender-cache:
      name: ${CACHE_VOLUME}