docker-compose.yml

version: '3.8'

services:
  scrappers:
    build:
      context: ./scrappers
      dockerfile: Dockerfile
    depends_on:
      db:
        condition: service_healthy  # Wait until the health check passes
    ports:
      - "5000:5000" # Port 5000 on host to port 5000 on container
    volumes:
      - ./scrappers:/app  # Mount scrappers directory for persistence
    env_file:
      - .env  # Add environment variables from file
    environment:
      # Credentials used to connect to db from db.py __init__ method
      # Located in root .env file
      - DB_HOST=${DB_HOST_DOCKER}
      - DB_PORT=${DB_PORT}
      - DB_USER=${DB_USER}
      - DB_PASS=${DB_PASS}
      - DB_NAME=${DB_NAME}
      # Add email credentials for notifier?
      - GMAIL_CRED=${GMAIL_CRED}

  db:
    image: mysql:8.0.35
    command: --default-authentication-plugin=mysql_native_password
    volumes:
      # Mount SQL scripts for database initialization
      - ./db/sql/init_sql_scripts:/docker-entrypoint-initdb.d
    env_file:
      - .env  # Add environment variables from file
    ports:
      - "3307:3306"  # Port 3307 on host to port 3306 on container
    environment:
      - MYSQL_ROOT_PASSWORD=${DB_PASS} 
    healthcheck:
      test: ["CMD", "mysql", "-h", "localhost", "-u", "root", "-p${DB_PASS}", "-e", "SELECT 1"]
      timeout: 20s
      retries: 10

  redis:
    image: redis:alpine
    ports:
      - "6380:6379"  # Port 6380 on host to port 6379 on container
    
  backend:
    command: sh -c "python3 manage.py migrate --noinput && python manage.py runserver"
    build:
      context: ./backend
      dockerfile: Dockerfile
    volumes:
      - ./backend:/app  # Mount backend directory for persistence
    depends_on:
      db:
        condition: service_healthy  # Wait until the health check passes
    ports:
      - "8000:8000" # Port 8000 on host to port 8000 on container
    env_file:
      - .env  # Add environment variables from file
    environment:
      # Credentials used to connect to db from settings.py
      # Located in root .env file
      - DB_HOST=${DB_HOST_DOCKER}
      - DB_PORT=${DB_PORT}
      - DB_USER=${DB_USER}
      - DB_PASS=${DB_PASS}
      - DB_NAME=${DB_NAME}

  frontend:
    build:
      context: ./frontend
      dockerfile: Dockerfile
    depends_on:
      db:
        condition: service_healthy  # Wait until the health check passes
    ports:
      - "5173:5173" # Port 5173 on host to port 5173 on container
    volumes:
      - ./frontend:/app  # Mount frontend directory for persistence
    env_file:
      - .env  # Add environment variables from file

# Notes
# ---------------------------------------------------------------------------------------------
# 1. The db host name is 'db' because docker compose creates the same network
# for all services in the docker-compose.yml file
# https://docs.docker.com/compose/networking/
# The db port is 3306 because that is the MySQL port in the container specified in the ports section
# And since we are trying to connect the 2 containers, we use the container port
# The db might take a while to start up, so the app might fail to connect to the db at first
# If that happens, just restart the app container --> See README.md for more details
# ---------------------------------------------------------------------------------------------
# 2. The db container mounts the init_sql_scripts directory to the /docker-entrypoint-initdb.d directory
# in the container. This is where MySQL looks for SQL scripts to run when the container starts up
# to initialize the database. The scripts are run in alphabetical order.