This project is a demo for a talk I'll give at SymfonyLive Paris 2025.

It's all about async processing with Symfony Messenger and Mercure.

A Docker environment is provided and requires you to have these tools available:

• Docker
• Bash
• Castor

Once castor is installed, in order to improve your usage of castor scripts, you can install console autocompletion script.

If you are using bash:

castor completion | sudo tee /etc/bash_completion.d/castor

If you are using something else, please refer to your shell documentation. You may need to use castor completion > /to/somewhere.

castor supports completion for bash, zsh & fish shells.

The Docker infrastructure provides a web stack with:

• FrankenPHP (+Mercure)
• PostgreSQL
• Traefik
• A container with some tooling:
  • Composer
  • Node
  • Yarn / NPM

Before running the application for the first time, ensure your domain names point the IP of your Docker daemon by editing your /etc/hosts file.

This IP is probably 127.0.0.1 unless you run Docker in a special VM (like docker-machine for example).

echo '127.0.0.1 async-messenger-mercure.test' | sudo tee -a /etc/hosts

Launch the stack by running this command:

castor start

The site is now accessible at the hostnames you have configured over HTTPS (you may need to accept self-signed SSL certificate if you do not have mkcert installed on your computer - see below).

HTTPS is supported out of the box. SSL certificates are not versioned and will be generated the first time you start the infrastructure (castor start) or if you run castor docker:generate-certificates.

If you have mkcert installed on your computer, it will be used to generate locally trusted certificates. See mkcert documentation to understand how to install it. Do not forget to install CA root from mkcert by running mkcert -install.

If you don't have mkcert, then self-signed certificates will instead be generated with openssl. You can configure infrastructure/docker/services/router/openssl.cnf to tweak certificates.

You can run castor docker:generate-certificates --force to recreate new certificates if some were already generated. Remember to restart the infrastructure to make use of the new certificates with castor up or castor start.

Having some composer, yarn or other modifications to make on the project? Start the builder which will give you access to a container with all these tools available:

castor builder

Checkout castor to have the list of available tasks.