# ============================================
#  Docker Compose — Distributed Rate Limiter
# ============================================
#
# This file runs:
#   1. A Redis container (shared datastore)
#   2. Two Node.js server containers (simulating distributed system)
#
# Both servers connect to the SAME Redis instance,
# so rate limits are enforced globally across all servers.

version: "3.8"

services:
  # --------------------------------------------------
  # Redis — The shared datastore for rate limit counters
  # --------------------------------------------------
  redis:
    image: redis:7-alpine
    container_name: rate-limiter-redis
    ports:
      - "6379:6379"
    volumes:
      - redis_data:/data
    restart: unless-stopped

  # --------------------------------------------------
  # Server 1 — First Node.js instance (port 3001)
  # --------------------------------------------------
  server1:
    build: .
    container_name: rate-limiter-server1
    ports:
      - "3001:3000"
    environment:
      - PORT=3000
      - REDIS_HOST=redis
      - REDIS_PORT=6379
      - RATE_LIMIT_WINDOW_SEC=60
      - RATE_LIMIT_MAX_REQUESTS=10
    depends_on:
      - redis
    restart: unless-stopped

  # --------------------------------------------------
  # Server 2 — Second Node.js instance (port 3002)
  # --------------------------------------------------
  server2:
    build: .
    container_name: rate-limiter-server2
    ports:
      - "3002:3000"
    environment:
      - PORT=3000
      - REDIS_HOST=redis
      - REDIS_PORT=6379
      - RATE_LIMIT_WINDOW_SEC=60
      - RATE_LIMIT_MAX_REQUESTS=10
    depends_on:
      - redis
    restart: unless-stopped

volumes:
  redis_data: