feat: add built-in Mercure support

Dockerfile

@@ -5,7 +5,7 @@
 
 # https://docs.docker.com/engine/reference/builder/#understand-how-arg-and-from-interact
 ARG PHP_VERSION=7.4
-ARG CADDY_VERSION=2.1.1
+ARG CADDY_VERSION=2
 
 # "php" stage
 FROM php:${PHP_VERSION}-fpm-alpine AS symfony_php
@@ -109,12 +109,16 @@ CMD ["php-fpm"]
 FROM caddy:${CADDY_VERSION}-builder-alpine AS symfony_caddy_builder
 
 RUN xcaddy build \
+    --with github.com/dunglas/mercure@main \
+    --with github.com/dunglas/mercure/caddy@main \
     --with github.com/dunglas/vulcain/caddy
 
 FROM caddy:${CADDY_VERSION} AS symfony_caddy
 
 WORKDIR /srv/app
 
+ENV MERCURE_DEMO="demo /srv/mercure-assets/"
+COPY --from=dunglas/mercure:v0.11 /srv/public /srv/mercure-assets/
 COPY --from=symfony_caddy_builder /usr/bin/caddy /usr/bin/caddy
 COPY --from=symfony_php /srv/app/public public/
 COPY docker/caddy/Caddyfile /etc/caddy/Caddyfile

README.md

@@ -14,8 +14,9 @@ A [Docker](https://www.docker.com/)-based installer and runtime for the [Symfony
 
 * Production, development and CI ready
 * Automatic HTTPS (in dev and in prod!)
-* HTTP/2, HTTP/3 and [Server Push](https://symfony.com/doc/current/web_link.html) support
-* [Vulcain](https://vulcain.rocks)-enabled
+* HTTP/2, HTTP/3 and [Preload](https://symfony.com/doc/current/web_link.html) support
+* Built-in [Mercure](https://symfony.com/doc/current/mercure.html) hub
+* [Vulcain](https://vulcain.rocks) support
 * Just 2 services (PHP FPM and Caddy server)
 * Super-readable configuration
 

docker-compose.prod.yml

@@ -5,3 +5,9 @@ services:
   php:
     environment:
       APP_ENV: prod
+
+  caddy:
+    environment:
+      MERCURE_DEMO: # Disable the demo
+      MERCURE_PUBLISHER_JWT: ${MERCURE_PUBLISHER_JWT}
+      MERCURE_SUBSCRIBER_JWT: ${MERCURE_SUBSCRIBER_JWT}

docker-compose.yml

@@ -17,14 +17,18 @@ services:
     environment:
       # Run "composer require symfony/orm-pack" to install and configure Doctrine ORM
       DATABASE_URL: postgresql://${POSTGRES_USER:-symfony}:${POSTGRES_PASSWORD:-ChangeMe}@database:5432/${POSTGRES_DB:-app}?serverVersion=${POSTGRES_VERSION:-13}
+      # Run "composer require symfony/mercure-bundle" to install and configure the Mercure integration
+      MERCURE_PUBLISH_URL: ${MERCURE_URL:-http://caddy/.well-known/mercure}
       SYMFONY_VERSION:
 
   caddy:
     build:
       context: .
       target: symfony_caddy
     environment:
-      SERVER_NAME: ${SERVER_NAME:-localhost}
+      SERVER_NAME: ${SERVER_NAME:-localhost, caddy:80}
+      MERCURE_PUBLISHER_JWT: ${MERCURE_PUBLISHER_JWT:-!ChangeMe!}
+      MERCURE_SUBSCRIBER_JWT: ${MERCURE_SUBSCRIBER_JWT:-!ChangeMe!}
     restart: unless-stopped
     ports:
       - "80:80"

docker/caddy/Caddyfile

@@ -8,6 +8,20 @@ log
 
 route {
     root * /srv/app/public
+    mercure {
+        # Transport to use (default to Bolt)
+        transport_url bolt:///data/mercure.db
+        # Enable the demo endpoint (disable it in production!)
+        {$MERCURE_DEMO}
+        # Publisher JWT key
+        publisher_jwt {$MERCURE_PUBLISHER_JWT}
+        # Subscriber JWT key
+        subscriber_jwt {$MERCURE_SUBSCRIBER_JWT}
+        # Allow anonymous subscribers (double-check that it's what you want)
+        anonymous
+        # Enable the subscription API (double-check that it's what you want)
+        subscriptions
+    }
     vulcain
     push
     php_fastcgi php:9000

docs/build.md

@@ -17,6 +17,8 @@ For instance, use the following command to use the `master` branch of Symfony:
 
 ## Customizing the Server Name
 
-Use the `SERVER_NAME` environment variable to define your custom server name.
+Use the `SERVER_NAME` environment variable to define your custom server name(s).
 
-    $ SERVER_NAME=symfony.wip docker-compose up --build
+    $ SERVER_NAME="symfony.wip, caddy:80" docker-compose up --build
+
+If you use Mercure, keep `caddy:80` in the list to allow the PHP container to request the caddy service.

docs/extra-services.md

@@ -6,4 +6,5 @@ the recipe will automatically modify the `Dockerfile` and `docker-compose.yml` t
 The currently supported packages are:
 
 * `symfony/orm-pack`: install a PostgreSQL service
+* `symfony/mercure-bundle`: use the Mercure.rocks module shipped with Caddy
 * `symfony/messenger`: install a RabbitMQ service