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test2
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###################################################
# This Compose file provides the development environment for the todo app.
# 
# Seeing the final version of the application bundles the frontend with the
# backend, we are able to "simulate" that by using a proxy to route requests
# to the appropriate service. All requests to /api will be routed to the 
# backend while all other requests will be sent to the client service. While
# there is some overlap in the routing rules, the proxy determines the service
# based on the most specific rule.
#
# To support easier debugging and troubleshooting, phpMyAdmin is also included
# to provide a web interface to the MySQL database.
###################################################

###################################################
# Services
#
# The services define the individual components of our application stack.
# For each service, a separate container will be launched.
###################################################
services:

  ###################################################
  # Service: proxy
  #
  # This service is a reverse proxy that will route requests to the appropriate
  # service. Think of it like a HTTP router or a load balancer. It simply 
  # forwards requests and allows us to simulate the final version of the 
  # application where the frontend and backend are bundled together. We can 
  # also use it to route requests to phpMyAdmin, which won't be accessible at 
  # localhost, but at db.localhost.
  #
  # The image for this service comes directly from Docker Hub and is a Docker
  # Official Image. Since Traefik can be configured in a variety of ways, we
  # configure it here to watch the Docker events for new containers and to use
  # their labels for configuration. That's why the Docker socket is mounted.
  #
  # We also expose port 80 to connect to the proxy from the host machine.
  ###################################################
  proxy:
    image: traefik:v2.11
    command: --providers.docker
    ports:
      - 80:80
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock

  ###################################################
  # Service: backend
  # 
  # This service is the Node.js server that provides the API for the app.
  # When the container starts, it will use the image that results
  # from building the Dockerfile, targeting the backend-dev stage.
  #
  # The Compose Watch configuration is used to automatically sync the code
  # from the host machine to the container. This allows the server to be
  # automatically reloaded when code changes are made.
  #
  # The environment variables configure the application to connect to the
  # database, which is also configured in this Compose file. We obviously
  # wouldn't hard-code these values in a production environment. But, in
  # dev, these values are fine.
  #
  # Finally, the labels are used to configure Traefik (the reverse proxy) with
  # the appropriate routing rules. In this case, all requests to localhost/api/*
  # will be forwarded to this service's port 3000. 
  ###################################################
  backend:
    build:
      context: ./
      target: backend-dev
    environment:
      MYSQL_HOST: mysql
      MYSQL_USER: root
      MYSQL_PASSWORD: secret
      MYSQL_DB: todos
    develop:
      watch:
        - path: ./backend/src
          action: sync
          target: /usr/local/app/src
        - path: ./backend/package.json
          action: rebuild
    labels:
      traefik.http.routers.backend.rule: Host(`localhost`) && PathPrefix(`/api`)
      traefik.http.services.backend.loadbalancer.server.port: 3000

  ###################################################
  # Service: client
  #
  # The client service is the React app that provides the frontend for the app.
  # When the container starts, it will use the image that results from building
  # the Dockerfile, targeting the dev stage.
  #
  # The Compose Watch configuration is used to automatically sync the code from
  # the host machine to the container. This allows the client to be automatically
  # reloaded when code changes are made.
  # 
  # The labels are used to configure Traefik (the reverse proxy) with the 
  # appropriate routing rules. In this case, all requests to localhost will be
  # forwarded to this service's port 5173.
  ###################################################
  client:
    build:
      context: ./
      target: client-dev
    develop:
      watch:
        - path: ./client/src
          action: sync
          target: /usr/local/app/src
        - path: ./client/package.json
          action: rebuild
    labels:
      traefik.http.routers.client.rule: Host(`localhost`)
      traefik.http.services.client.loadbalancer.server.port: 5173


  ###################################################
  # Service: mysql
  #
  # The MySQL service is used to provide the database for the application.
  # The image for this service comes directly from Docker Hub and is a Docker 
  # Official Image.
  
  # The data is persisted in a volume named todo-mysql-data. Using a volume 
  # allows us to take down the services without losing the data. When we start
  # the services again, the data will still be there (assuming we didn't delete
  # the volume, of course!).
  #
  # The environment variables configure the root password and the name of the
  # database to create. Since these are used only for local development, it's
  # ok to hard-code them here.
  ###################################################
  mysql:
    image: mysql:8.0
    volumes:
      - todo-mysql-data:/var/lib/mysql
    environment: 
      MYSQL_ROOT_PASSWORD: secret
      MYSQL_DATABASE: todos

  ###################################################
  # Service: phpmyadmin
  #
  # This service provides a web interface to the MySQL database. It's useful
  # for debugging and troubleshooting data, schemas, and more. The image for 
  # this service comes directly from Docker Hub and is a Docker Official Image.
  #
  # The environment variables configure the connection to the database and 
  # provide the default credentials, letting us immediately open the interface
  # without needing to log in.
  #
  # The labels are used to configure Traefik (the reverse proxy) with the
  # routing rules. In this case, all requests to db.localhost will be forwarded
  # to this service's port 80.
  ###################################################
  phpmyadmin:
    image: phpmyadmin
    environment:
      PMA_HOST: mysql
      PMA_USER: root
      PMA_PASSWORD: secret
    labels:
      traefik.http.routers.phpmyadmin.rule: Host(`db.localhost`)
      traefik.http.services.phpmyadmin.loadbalancer.server.port: 80

###################################################
# Volumes
#
# For this application stack, we only have one volume. It's used to persist the
# data for the MySQL service. We are only going to use the default values,
# hence the lack of any configuration for the volume.
###################################################
volumes:
  todo-mysql-data: