General information

This project is the base structure for a microservice, applying Domain-Driven Design (DDD) and Command Query Responsibility Segregation (CQRS) with Event Sourcing (ES). It has the necessary files to act as api or as web. It uses PHP 8.1 and symfony 6.0 although it is decoupled from symfony. Use MySQL as the database and dbal, but an ORM can be changed if the team prefers. Once you have decided which type of microservice is going to be used, it is recommended that you delete the files related to each type.

Installation

How to install.

Steps:

1. Copy .env.example to .env and edit with correct values. Environment files are located in config/environments folder.
2. Run service

docker-compose -f docker-compose-dev.yml up -d

2. Install dependencies:

docker exec -it <container_name> php composer.phar install

<container_name>: The name in the docker-compose-dev.yml file

3. Add hook so that commits cannot be made if validations do not pass

Add .git/hooks/pre-commit file Make it executable chmod +x .git/hooks/pre-commit Add content:

#!/bin/bash

exec < /dev/tty

docker exec <container_name> php composer.phar csstan &&
docker exec <container_name> php bin/phpunit --configuration /var/www/phpunit.xml.dist

rc=$?

exit $rc

Use It

⚠️ The application container is mapped to port 8001 so the requests have to be like this: http://localhost:8001/healthcheck

Web version

http://localhost:8001/

Api version

Example of DDD with CQRS but with out Event Sourcing

curl --location --request PUT 'localhost:8001/v1/user/a95c0896-1d05-4785-95ec-a7bc0229f356' \
--header 'Content-Type: application/json' \
--data-raw '{
    "name": "Jonh Doe",
    "email": "jonh@doe.com",
    "password": "jonhdoe"
}'

Example of DDD with CQRS and Event Sourcing

curl --location --request PUT 'localhost:8001/v1/ticket/a95c0896-1d05-4785-95ec-a7bc0229f352' \
--header 'Content-Type: application/json' \
--data '{
    "user_id": "bad30a5b-6f7a-472f-9400-9462d90f0a8f",
    "comment_id": "2dd78746-a677-49eb-947b-5678261bc21f",
    "comment_title": "Opening a new ticket",
    "comment_description": "Help me please...",
}'

File to delete according to type of microservice:

Delete the following unnecessary files if you want an API type microservice:

#TODO: List files to delete for API type

Delete the following unnecessary files if you want a Web type microservice:

#TODO: List files to delete for Web type

IMPORTANT Before using this skeleton you should

• Edit phpstan.neon package name
• Edit composer.json and change:
  • project name
  • project description
  • autoload and autoload-dev package names
• Edit app/Kernel.php package name
• Edit public/index.php Kernel package name import
• Edit bin/console.php Kernel package name import
• Edit config/services.yaml packages name for app and src
• Edit docker-compose-dev.yml service name, container name, image and ports
• Edit the log related classes namespace (/src/Shared/Log)
• Edit this file removing these instructions and filling content

Important things to know

Domain Events:

Currently events are fired and consumed in memory InMemorySymfonyEventBus, but the project is also prepared to store and consume them with rabbitMQ RabbitMqEventBus.

Consumers:

Supervisor has been added to be in charge of picking up the consumers. To do this, a configuration file UserCreatedSendEmailConsumer.conf has been created as an example, which is responsible for launching the rabbitMQ command LaunchRabbitMqConsumerCommand.

php bin/console rabbitmq:consume UserCreatedSendEmailConsumer

Exception Listener:

This ApiExceptionListener listener is responsible for catching the exceptions that are thrown in the microservice and returning a json with the error.

Auth Middleware:

This middleware BasicHttpAuthMiddleware serves to authenticate the requests made to the microservice. It remains to implement AuthenticateUserCommand to check the username and password. It can be modified to handle tokens.

Transaction Middleware:

This middleware BasicHttpAuthMiddleware serves to authenticate the requests made to the microservice. It remains to implement AuthenticateUserCommand to check the username and password. It can be modified to handle tokens.

Use

Go to this route (in browser): http://localhost:<container_binding_port>/healthcheck

Composer scripts

There are several scripts in composer:

How to run:

docker exec -it <container_name> php composer.phar <script_name>

Auto Scripts

Scripts that should be executed automatically each time together. You can run them manually by doing:

composer auto-scripts

Post Install CMD

This scripts in here will be executed after the install command has been executed with a lock file present.

Post Update CMD

This scripts in here will be executed after the update command is executed or before the install command is executed without a lock file present

PHP CS

With this command you can know what changes you should do to your code to fix code style. You can run it by executing:

composer cs

PHP CS FIX

With this command you can fix php code style automatically by executing:

composer cs-fix

STAN

With this command you can run the static analysis tool phpstan by executing:

composer stan

php CS FIX + STAN

With this command you can fix your code style and run the static analysis tool phpstan by executing:

composer csstan

Run tests

docker exec -it <container_name> php bin/phpunit

Run console command

docker exec -it <container_name> php bin/console <command_name>

Run symfony command

docker exec -it <container_name> symfony <command_name>

View the syslog:

tail -f var/log/syslog.log

Stop service

docker-compose -f docker-compose-dev.yml down

Run the integration tests environment

This command run the application containers in a separate docker network for the integration tests.

When you build the image, the content of your project is copied into the container so it is the code you have locally that is tested.

docker-compose -f docker-compose-test.yml up -d --build

TODO:

• Add Event Sourcing (ES):
• Add Auth Middleware:
• Add Transaction Middleware
• Add DomainEventStorer (remove)
• Add Healthcheck
• Change Postgres to MySQL
• Fix errors from cs-fixer, phpstan
• Do Make file
• Add more tests
• Migrate to PHP 8.2
• List files to delete according to type of microservice