docker-compose.yml

version: "3.9"
services:
  emulator:
    # set up functions emulator locally
    # especially functions configuration
    # we need to create `.runtimeconfig.json`
    # https://firebase.google.com/docs/functions/local-emulator
    build: ./functions
    volumes:
      - .:/node_app/app
      - ./functions/package.json:/node_app/package.json
      - ./functions/package-lock.json:/node_app/package-lock.json
      - no-used:/node_app/app/functions/node_modules
      # avoid emulators repeated download
      # https://firebase.google.com/docs/emulator-suite/install_and_configure#running_containerized_emulator_suite_images
      - emulators:/home/node/.cache/firebase/emulators/
    # used for pubsub emulator connection
    environment:
      - PUBSUB_EMULATOR_HOST=pubsub_emulator:8085
      - PUBSUB_PROJECT_ID=${PUBSUB_PROJECT_ID:-test}
    ports:
      # need to specify host as 0.0.0.0 so that we can connect to the container
      # fron host
      # from: https://stackoverflow.com/questions/66176947/run-google-firestore-emulator-with-docker-compose
      # from: https://stackoverflow.com/questions/20778771/what-is-the-difference-between-0-0-0-0-127-0-0-1-and-localhost
      - "0.0.0.0:5001:5001"
      - "0.0.0.0:4000:4000"
      - "0.0.0.0:9099:9099"
      - "0.0.0.0:8080:8080"
      - "0.0.0.0:9199:9199"
    stdin_open: true
    tty: true
  pubsub_emulator:
    build:
      # https://github.com/GoogleCloudPlatform/cloud-sdk-docker
      # https://docs.docker.com/engine/reference/commandline/build/#git-repositories
      # https://docs.docker.com/build/building/context/#url-context
      # {branch}/{dir}
      # WARNING: currently could not use remote git source
      # related to buildkit
      # https://github.com/docker/compose-cli/issues/1958
      # context: https://github.com/GoogleCloudPlatform/cloud-sdk-docker.git#master:debian_slim
      # WORKAROUND: manually clone repo to local from https://github.com/GoogleCloudPlatform/cloud-sdk-docker
      context: ./cloud-sdk-docker/debian_slim
      args:
        - INSTALL_COMPONENTS=google-cloud-cli-app-engine-java google-cloud-cli-pubsub-emulator openjdk-17-jre
        - CLOUD_SDK_VERSION=431.0.0
    volumes:
      - ./pubsub-emulator:/pubsub-emulator
    # https://cloud.google.com/sdk/gcloud/reference/beta/emulators/pubsub/start
    # default host port is localhost:8085
    # use --quiet flag to accept default answers for all prompts
    command: gcloud --quiet beta emulators pubsub start --data-dir=/pubsub-emulator --host-port=pubsub_emulator:8085
  pubsub_clients_setting:
    build:
      context: ./
      dockerfile: Dockerfile.python3.pubsub.clients
    # used environment variable to set the compose variable
    # https://docs.docker.com/compose/environment-variables/
    environment:
      - PUBSUB_EMULATOR_HOST=pubsub_emulator:8085
      - PUBSUB_PROJECT_ID=${PUBSUB_PROJECT_ID:-test}
    # https://cloud.google.com/pubsub/docs/emulator#using_the_emulator
    # https://docs.docker.com/compose/compose-file/compose-file-v3/#variable-substitution
    # a $$ allows you to refer to environment variables that you don’t want processed by Compose.
    
    # https://docs.docker.com/engine/reference/builder/#cmd
    # https://stackoverflow.com/questions/30063907/using-docker-compose-how-to-execute-multiple-commands
    # use the shell form or execute a shell directly for shell processing
    command: >
      bash -c " /wait-for-it/wait-for-it.sh $${PUBSUB_EMULATOR_HOST} --
      echo \"pubsub emulator ready($${PUBSUB_EMULATOR_HOST}), start pubsub setting...\"
      && python publisher.py ${PUBSUB_PROJECT_ID:-test} create ${TOPIC_ID:-test-topic}
      && python subscriber.py ${PUBSUB_PROJECT_ID:-test} create ${TOPIC_ID:-test-topic} ${SUBSCRIPTION_ID:-test-topic-sub}"
    # https://docs.docker.com/compose/compose-file/compose-file-v3/#depends_on
    # improvement direction: https://docs.docker.com/compose/startup-order/
    # However, the python pubsub client would wait for port to run and 
    #   set the pubsub topic and subscription
    depends_on:
      - pubsub_emulator
  apollo:
    build: 
      context: ./apollo
      dockerfile: Dockerfile.test
    volumes: 
      - ./apollo:/node_app/app
      - ./apollo/package.json:/node_app/package.json
      - ./apollo/package-lock.json:/node_app/package-lock.json
      - no-used:/node_app/app/apollo/node_modules
    env_file: ./apollo/compose.env
    # used for pubsub emulator connection
    environment:
      - PUBSUB_EMULATOR_HOST=pubsub_emulator:8085
      - PUBSUB_PROJECT_ID=${PUBSUB_PROJECT_ID:-test}
    ports:
      - "8333:8080"
volumes:
  no-used:
  emulators: