docker-compose.yml

version: "3.9"

# ─────────────────────────────────────────────────────────────────────────────
# Local development stack — spins up a Redis 7 instance with persistence
# ─────────────────────────────────────────────────────────────────────────────
services:
  redis:
    image: redis:7-alpine
    container_name: ws-gateway-redis
    ports:
      - "${REDIS_PORT:-6379}:6379"
    volumes:
      - redis-data:/data
    # AOF persistence so channel state survives restarts during dev
    command: redis-server --appendonly yes --appendfsync everysec
    healthcheck:
      test: ["CMD", "redis-cli", "ping"]
      interval: 10s
      timeout: 5s
      retries: 5
    restart: unless-stopped

  # ── Uncomment to simulate a second gateway instance for scaling demos ──────
  # gateway-1:
  #   build: .
  #   environment:
  #     - PORT=3001
  #     - REDIS_HOST=redis
  #     - INSTANCE_ID=instance-1
  #   ports:
  #     - "3001:3001"
  #   depends_on:
  #     redis:
  #       condition: service_healthy
  #
  # gateway-2:
  #   build: .
  #   environment:
  #     - PORT=3002
  #     - REDIS_HOST=redis
  #     - INSTANCE_ID=instance-2
  #   ports:
  #     - "3002:3002"
  #   depends_on:
  #     redis:
  #       condition: service_healthy

volumes:
  redis-data:
    driver: local