docker-compose.yml

services:

  reverse-proxy:
    image: nginx:latest
    volumes:
      - ./nginx.conf:/etc/nginx/nginx.conf:ro
    depends_on:
      - app-server
    ports:
      - "8080:8080"  # bound to host port, exposed app endpoint

  app-server:
    build:
      context: .
      dockerfile: ./docker/Dockerfile
    command:
      [ "gunicorn", "--bind", ":8080", "app:server", "--workers", "1", "--threads", "2" ]
    # ports:
    #   - 8080:8080
    depends_on:
      - worker-callback
      - worker-query
      - redis-cache
      - redis-users
    env_file:
      - ./env.list
    restart: always

  worker-callback:
    build:
      context: .
      dockerfile: ./docker/Dockerfile
    command:
      [ "celery", "-A", "app:celery_app", "worker", "--loglevel=INFO" ]
    depends_on:
      - redis-cache
      - redis-users
    env_file:
      - ./env.list
    restart: always

  worker-query:
    build:
      context: .
      dockerfile: ./docker/Dockerfile
    command:
      [ "celery", "-A", "app:celery_app", "worker", "--loglevel=INFO", "-Q", "data" ]
    depends_on:
      - redis-cache
    env_file:
      - ./env.list
    restart: always

  # for data blob caching
  redis-cache:
    image: docker.io/library/redis:6
    command:
      - /bin/sh
      - -c
      # - Double dollars, so that the variable is not expanded by Docker Compose
      # - Surround by quotes, so that the shell does not split the password
      # - The ${variable:?message} syntax causes shell to exit with a non-zero
      #   code and print a message, when the variable is not set or empty
      - redis-server --requirepass "$${REDIS_PASSWORD:?REDIS_PASSWORD variable is not set}"
    env_file:
      - ./env.list
    restart: always

  # for user session storage
  redis-users:
    image: docker.io/library/redis:6
    command:
      - /bin/sh
      - -c
      # - Double dollars, so that the variable is not expanded by Docker Compose
      # - Surround by quotes, so that the shell does not split the password
      # - The ${variable:?message} syntax causes shell to exit with a non-zero
      #   code and print a message, when the variable is not set or empty
      - redis-server --requirepass "$${REDIS_PASSWORD:?REDIS_PASSWORD variable is not set}"
    env_file:
      - ./env.list
    restart: always

  # flower:
  #   build:
  #     context: .
  #     dockerfile: ./docker/Dockerfile
  #   command:
  #     [ "celery", "-A", "app:celery_app", "flower" ]
  #   depends_on:
  #     - worker-callback
  #     - worker-query
  #     - redis-cache
  #     - app-server
  #   env_file:
  #     - ./env.list
  #   ports:
  #     - 5555:5555
  #   profiles:
  #     - monitoring  # run w/ '--profile monitoring' flag to enable