docker-compose.yml

version: '3.8'

services:
  # Redis - In-memory cache for hash validation and deduplication
  redis:
    image: redis:7-alpine
    container_name: voting-redis
    ports:
      - "6379:6379"
    volumes:
      - redis-data:/data
    command: redis-server --appendonly yes
    networks:
      - voting-network
    healthcheck:
      test: ["CMD", "redis-cli", "ping"]
      interval: 10s
      timeout: 5s
      retries: 5
    restart: unless-stopped

  # RabbitMQ - Message queue for vote processing
  rabbitmq:
    image: rabbitmq:3-management
    container_name: voting-rabbitmq
    ports:
      - "5672:5672"   # AMQP protocol
      - "15672:15672" # Management UI
    environment:
      RABBITMQ_DEFAULT_USER: guest
      RABBITMQ_DEFAULT_PASS: guest
    volumes:
      - rabbitmq-data:/var/lib/rabbitmq
    networks:
      - voting-network
    healthcheck:
      test: ["CMD", "rabbitmq-diagnostics", "ping"]
      interval: 10s
      timeout: 5s
      retries: 5
    restart: unless-stopped

  # PostgreSQL - Persistent storage for vote results and audit
  postgres:
    image: postgres:15-alpine
    container_name: voting-postgres
    ports:
      - "5432:5432"
    environment:
      POSTGRES_DB: voting
      POSTGRES_USER: voting_user
      POSTGRES_PASSWORD: voting_password
    volumes:
      - postgres-data:/var/lib/postgresql/data
      - ./data/init_db.sql:/docker-entrypoint-initdb.d/init_db.sql
    networks:
      - voting-network
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U voting_user -d voting"]
      interval: 10s
      timeout: 5s
      retries: 5
    restart: unless-stopped

  # Ingestion API - FastAPI service for receiving votes
  ingestion-api:
    build:
      context: ./services/ingestion_api
      dockerfile: Dockerfile
    container_name: voting-ingestion-api
    ports:
      - "8000:8000"
    env_file:
      - .env
    environment:
      - REDIS_HOST=redis
      - RABBITMQ_HOST=rabbitmq
      - POSTGRES_HOST=postgres
    depends_on:
      redis:
        condition: service_healthy
      rabbitmq:
        condition: service_healthy
      postgres:
        condition: service_healthy
    networks:
      - voting-network
    restart: unless-stopped
    healthcheck:
      test: ["CMD", "curl", "-f", "http://localhost:8000/health"]
      interval: 30s
      timeout: 10s
      retries: 3

  # Validation Worker - Scalable workers for vote validation
  validation-worker:
    build:
      context: ./services/validation_worker
      dockerfile: Dockerfile
    env_file:
      - .env
    environment:
      - REDIS_HOST=redis
      - RABBITMQ_HOST=rabbitmq
      - POSTGRES_HOST=postgres
    depends_on:
      redis:
        condition: service_healthy
      rabbitmq:
        condition: service_healthy
      postgres:
        condition: service_healthy
    networks:
      - voting-network
    restart: unless-stopped
    # Scale with: docker-compose up --scale validation-worker=5

  # Aggregation Service - Processes validated votes
  aggregation:
    build:
      context: ./services/aggregation
      dockerfile: Dockerfile
    container_name: voting-aggregation
    env_file:
      - .env
    environment:
      - RABBITMQ_HOST=rabbitmq
      - POSTGRES_HOST=postgres
    depends_on:
      rabbitmq:
        condition: service_healthy
      postgres:
        condition: service_healthy
    networks:
      - voting-network
    restart: unless-stopped

  # Prometheus - Metrics collection
  prometheus:
    image: prom/prometheus:latest
    container_name: voting-prometheus
    ports:
      - "9090:9090"
    volumes:
      - ./monitoring/prometheus/prometheus.yml:/etc/prometheus/prometheus.yml
      - ./monitoring/prometheus/alerts.yml:/etc/prometheus/alerts.yml
      - prometheus-data:/prometheus
    command:
      - '--config.file=/etc/prometheus/prometheus.yml'
      - '--storage.tsdb.path=/prometheus'
      - '--web.console.libraries=/etc/prometheus/console_libraries'
      - '--web.console.templates=/etc/prometheus/consoles'
      - '--web.enable-lifecycle'
    networks:
      - voting-network
    restart: unless-stopped

  # Grafana - Monitoring dashboards
  grafana:
    image: grafana/grafana:latest
    container_name: voting-grafana
    ports:
      - "3001:3000"
    environment:
      - GF_SECURITY_ADMIN_PASSWORD=admin
      - GF_USERS_ALLOW_SIGN_UP=false
    volumes:
      - ./monitoring/grafana/provisioning:/etc/grafana/provisioning
      - ./monitoring/grafana/dashboards:/var/lib/grafana/dashboards
      - grafana-data:/var/lib/grafana
    depends_on:
      - prometheus
    networks:
      - voting-network
    restart: unless-stopped

networks:
  voting-network:
    driver: bridge

volumes:
  redis-data:
    driver: local
  rabbitmq-data:
    driver: local
  postgres-data:
    driver: local
  prometheus-data:
    driver: local
  grafana-data:
    driver: local