services:
  # PostgreSQL runs in a container of its own: peekaping connects to it by the name `postgres`.
  postgres:
    image: postgres:17
    restart: unless-stopped
    environment:
      POSTGRES_USER: ${DB_USER:-postgres}
      POSTGRES_PASSWORD: ${DB_PASS:-password}
      POSTGRES_DB: ${DB_NAME:-peekaping}
    volumes:
      # Database data persistence. Not ./.data/postgres, where the old PostgreSQL bundle kept
      # its cluster: the official image can't use that one.
      - ./.data/postgres17:/var/lib/postgresql/data
    healthcheck:
      test:
        [
          "CMD-SHELL",
          "pg_isready -U ${DB_USER:-postgres} -d ${DB_NAME:-peekaping}",
        ]
      interval: 10s
      timeout: 2s
      retries: 5
      start_period: 5s

  peekaping:
    build:
      context: .
      dockerfile: Dockerfile.single
    restart: unless-stopped
    # peekaping takes up to 30 seconds to shut down cleanly
    stop_grace_period: 35s
    ports:
      - "8383:8383"
    env_file:
      - .env
    environment:
      # The user, password and database that the postgres service creates. DB_HOST and DB_PORT
      # are the service's name and port on the Compose network, whatever a .env shared with
      # cluster mode says (it sets DB_HOST=database).
      DB_TYPE: postgres
      DB_HOST: postgres
      DB_PORT: "5432"
      DB_USER: ${DB_USER:-postgres}
      DB_PASS: ${DB_PASS:-password}
      DB_NAME: ${DB_NAME:-peekaping}
    depends_on:
      postgres:
        condition: service_healthy