docker-compose.yml

services:
  mysql:
    image: mysql:8.3.0
    container_name: mysql
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: password
      MYSQL_DATABASE: watt_tracker_db
    ports:
      - "3306:3306"
    volumes:
      - ./docker/mysql/init.sql:/docker-entrypoint-initdb.d/init.sql
      - db-data:/var/lib/mysql

  kafka:
    container_name: kafka
    image: apache/kafka:latest
    ports:
      - "9092:9092"  # Internal listener (Docker network)
      - "9094:9094"  # External listener (host machine)

    environment:
      ############################################
      # KRaft Metadata & Node Identity
      ############################################
      # Unique ID for this Kafka node
      KAFKA_NODE_ID: 1
      # Unique Kafka cluster identifier (required for KRaft mode)
      KAFKA_CLUSTER_ID: 'energy-tracker-cluster-1'
      # Node roles — this instance will act as BOTH a broker and controller
      KAFKA_PROCESS_ROLES: 'broker,controller'

      ############################################
      # Controller Quorum Configuration (Raft)
      ############################################
      # List of controller nodes that form the Raft quorum
      KAFKA_CONTROLLER_QUORUM_VOTERS: '1@kafka:9093'
      # Listener name used by controllers for internal Raft communication
      KAFKA_CONTROLLER_LISTENER_NAMES: 'CONTROLLER'

      ############################################
      # Network Listeners (Internal, External & Controller)
      ############################################
      # Define all listener endpoints for this Kafka node
      KAFKA_LISTENERS: >
        PLAINTEXT://0.0.0.0:9092,
        EXTERNAL://0.0.0.0:9094,
        CONTROLLER://0.0.0.0:9093

      # What each listener advertises to connecting clients
      # Internal (Docker containers): kafka:9092
      # External (host machine): localhost:9094
      KAFKA_ADVERTISED_LISTENERS: >
        PLAINTEXT://kafka:9092,
        EXTERNAL://localhost:9094

      # Maps listener names to their security protocols
      KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: >
        CONTROLLER:PLAINTEXT,
        PLAINTEXT:PLAINTEXT,
        EXTERNAL:PLAINTEXT

      # Which listener brokers should use for internal communication
      KAFKA_INTER_BROKER_LISTENER_NAME: 'PLAINTEXT'

      ############################################
      #  Single-Node Cluster Safety Settings
      #    (because replication >1 would break)
      ############################################
      KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1
      KAFKA_TRANSACTION_STATE_LOG_REPLICATION_FACTOR: 1
      KAFKA_TRANSACTION_STATE_LOG_MIN_ISR: 1

      ############################################
      #  Broker Defaults & Quality-of-Life Settings
      ############################################
      # Speed up consumer group startup
      KAFKA_GROUP_INITIAL_REBALANCE_DELAY_MS: 0
      # Auto-create topics if they don't already exist
      KAFKA_AUTO_CREATE_TOPICS_ENABLE: 'true'
      # Default number of partitions per topic
      KAFKA_NUM_PARTITIONS: 1

    volumes:
      - ./docker/kafka_data:/var/lib/kafka/data

  kafka-ui:
    container_name: kafka-ui
    image: ghcr.io/kafbat/kafka-ui:latest
    ports:
      - "8070:8080"
    depends_on:
      - kafka
    environment:
      KAFKA_CLUSTERS_0_NAME: local
      KAFKA_CLUSTERS_0_BOOTSTRAPSERVERS: kafka:9092  # Use internal Docker network name
      DYNAMIC_CONFIG_ENABLED: 'true'
    restart: unless-stopped

  influxdb:
    image: influxdb:2.7
    container_name: influxdb
    ports:
      - "8072:8086"
    environment:
      - DOCKER_INFLUXDB_INIT_MODE=setup
      - DOCKER_INFLUXDB_INIT_USERNAME=admin
      - DOCKER_INFLUXDB_INIT_PASSWORD=admin123
      - DOCKER_INFLUXDB_INIT_ORG=watt-tracker
      - DOCKER_INFLUXDB_INIT_BUCKET=usage-bucket
      - DOCKER_INFLUXDB_INIT_RETENTION=1w
      - DOCKER_INFLUXDB_INIT_ADMIN_TOKEN=my-token
    volumes:
      - ./influxdb_data:/var/lib/influxdb2

  mailpit:
    image: axllent/mailpit:latest
    container_name: mailpit
    ports:
      - "8025:8025"
      - "1025:1025"

volumes:
  db-data:
  kafka-data: