version: '3'

services:
  prometheus:
    image: prom/prometheus
    ports:
      - 9090:9090
    volumes:
      - ./prometheus/:/etc/prometheus/
      - prometheus_data:/prometheus
    command:
      - --config.file=/etc/prometheus/prometheus.yml
      - --storage.tsdb.path=/prometheus
    extra_hosts:
      - "host.docker.internal:host-gateway" # https://stackoverflow.com/a/43541732/5204678

  grafana:
    image: grafana/grafana
    ports:
      - 3000:3000
    environment:
      PROMETHEUS_URL: http://prometheus:9090
    # 1. Copy dashboards from temp directory to prevent modifying original host files
    # 2. Replace Prometheus datasource placeholder with the actual name
    # 3. Run Grafana
    entrypoint: >
      sh -c "cp -r /etc/grafana/provisioning_temp/dashboards/. /etc/grafana/provisioning/dashboards &&
             find /etc/grafana/provisioning/dashboards/ -name '*.json' -exec sed -i 's/$${DS_PROMETHEUS}/Prometheus/g' {} \+ &&
             /run.sh"
    volumes:
      - grafana_data:/var/lib/grafana
      - ./grafana/datasources:/etc/grafana/provisioning/datasources
      - ./grafana/dashboards:/etc/grafana/provisioning_temp/dashboards
    depends_on:
      - prometheus

volumes:
  prometheus_data:
  grafana_data: