# Place search for Halkyon Train (ADR 0030, D50), beside compose.train.yaml, which it
# needs: Photon on GraphHopper's weekly database of Europe, asked by Train's server,
# and by Todo's where compose.todo-search.yaml joins it. Switched on in .env:
#
#   COMPOSE_FILE=compose.learn.yaml:compose.train.yaml:compose.search.yaml
#
# Photon has no site and no sign-in: only the apps' servers reach it, on a network of
# their own without a way out, for people signed in, and nothing it is asked is kept
# or logged. Its database (Europe's: a 32.6 GB download on 29 Oct 2026, more
# unpacked, to be measured) is in ./photon/data, renewed monthly, owned by a user ID of
# its own, which no person, no other container and not the CI runner uses. Its memory:
# PHOTON_HEAP (6g) for Java, PHOTON_MEMORY (8g) for the container. Setting it up:
# sidecars/README.md, Train's search.

services:
  photon:
    build:
      context: ..
      dockerfile: deploy/photon/Dockerfile
    image: halkyon-photon
    restart: unless-stopped
    user: "61179:61179"
    read_only: true
    tmpfs:
      - /tmp:size=64m,uid=61179,gid=61179
    environment:
      PHOTON_HEAP: ${PHOTON_HEAP:-6g}
    volumes:
      - ./photon/data:/data
    # Beside the apps' servers alone: no site, no published port, no way out.
    networks:
      - search
    mem_limit: ${PHOTON_MEMORY:-8g}
    # No log: what people search for is where they go.
    logging:
      driver: none

  photon-data:
    image: halkyon-photon
    restart: unless-stopped
    user: "61179:61179"
    read_only: true
    tmpfs:
      - /tmp:size=16m,uid=61179,gid=61179
    command: ["/app/data.sh"]
    environment:
      # A path under GraphHopper's downloads; `europe/germany` for Germany alone.
      PHOTON_REGION: ${PHOTON_REGION:-europe}
    volumes:
      - ./photon/data:/data
    # Out to GraphHopper's downloads on `downloads`, an ordinary bridge with a way out
    # to anywhere, shared with BRouter's segments and the map's downloads.
    networks:
      - downloads
    mem_limit: 256m
    logging:
      driver: journald

  train-server:
    environment:
      PHOTON_URL: http://photon:2322/
    networks:
      - search

networks:
  # The apps' servers and Photon, without a way out.
  search:
    internal: true
  downloads: