compose.yaml

# NOTE: rebuild all docker images and run docker compose:
# docker compose up --build --force-recreate --no-deps (rebuilds all the services) 

services:
  kvs:
    container_name: "kvs-service"
    image: 'kvs:latest'
    build: 
      dockerfile: ./Dockerfile.kvs
    ports:
      # Port 8080 is accessible for servier-to-service communication, 
      # and the same port is available for accessing the container from outside the network.
      # locahost has to be specified, otherwise some weird things happening, 
      # only occasionally I can reach the endpoint from outside, using other clients (python for example).
      - "127.0.0.1:8080:8080"
      # this is reserved for fiber service
      # - "127.0.0.1:8080:4000"
    depends_on:
      - transaction-service
    networks:
      - backend

  transaction-service:
    container_name: "transaction-service"
    image: "txn:latest"
    build: 
      dockerfile: ./Dockerfile.txn
    ports:
      - "5051:5051"
    depends_on:
      postgres-db:
        condition: service_healthy

    networks:
      - backend

  postgres-db:
    image: 'postgres:16.3'
    restart: always
    container_name: "postgres-emulator"
    ports:
      # https://docs.docker.com/compose/networking/
      # HOST_PORT:CONTAINER_PORT
      # Networked service-to-service communication uses the CONTAINER_PORT.
      # Using the HOST_PORT, the container can be accessible from outside the network.
      # Thus, in order for kvs server to connect to postgres database running in a separate
      # docker container it should use URL: postgres://...@postgres-db:CONTAINER_PORT/...
      - "4040:5432"
    environment:
      # Define environment variables inside the container. 
      # It can come from .env file as well using env_file: directive.
      - POSTGRES_PORT=5432
      - POSTGRES_USER=postgres
      - POSTGRES_PASSWORD=nastish
      - POSTGRES_DB=postgres
    command: ["-c", "ssl=off"]
    networks:
      - backend
    healthcheck:
      # https://docs.docker.com/reference/dockerfile/#healthcheck
      # https://www.postgresql.org/docs/9.4/app-pg-isready.html
      test: ["CMD-SHELL", "pg_isready", "-d", "db_prod"]
      interval: 10s
      timeout: 2s
      retries: 5
      start_period: 0s

    # volumes:
    #  - postgres-db:/var/lib/postgresql/data

networks:
  backend:
    driver: bridge