What’s a typical Symfony 4.2 application like?

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application like? What’s a typical

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@nicolasgrekas

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Stability and predictability are king!

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A Symfony Application is built around a Runtime configurable compiled container @nicolasgrekas

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SOLID principles @nicolasgrekas

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reproducible-builds.org @nicolasgrekas

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12factor.net @nicolasgrekas

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@nicolasgrekas Big, explicit YAML files Big, explicit XML files 3rd Party Bundles Our App

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@nicolasgrekas app

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services: app.spooky_word_generator: class: App\SpookyWordGenerator app.halloween_costume_creator: class: App\HalloweenCostumeCreator arguments: ['@app.spooky_word_generator'] app.candy_aggregator: class: App\CandyAggregator arguments: - '@app.halloween_costume_creator' - '%kernel.project_dir%' app.doorbell_ring_event_subscriber: class: App\DoorbellRingEventSubscriber tags: ['kernel.event_subscriber']

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services: _defaults: autowire: true autoconfigure: true public: false App\: resources: ../src services.yaml

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services: _defaults: autowire: true autoconfigure: true public: false $container->get(‘my_service’) is dead! Extend from AbstractController now!

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@nicolasgrekas Symfony 4 spirit Keep coding features By automating your configuration and providing you with great error messages

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Don’t hack the conventions doing code Keep writing configuration for the exceptions to the rules @weaverryan

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services: _defaults: autowire: true autoconfigure: true public: false bind: $projectRoot: '%kernel.project_dir%'

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services: _defaults: autowire: true autoconfigure: true public: false bind: string $projectRoot: '%kernel.project_dir%' Stricter bindings

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services: _defaults: autowire: true autoconfigure: true public: false bind: Symfony\Contracts\Cache\CacheInterface $apiCache: '@api.cache' Works also for services

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services: Symfony\Contracts\Cache\CacheInterface $apiCache: '@api.cache' Named autowiring aliases

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services: Symfony\Contracts\Cache\CacheInterface $apiCache: '@api.cache' Your favorite bundles can provide some!

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bin/console debug:autowiring

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bin/console debug:autowiring Lists only autowiring aliases. They are the only useful services! \o/

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@weaverryan Environment Variables

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@weaverryan Our app needs a production API Key

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@weaverryan class DoorbellRingEventSubscriber { private $apiKey; public function __construct(string $apiKey) { $this->apiKey = $apiKey; } } services: _defaults: bind: $apiKey: 'ILOVECANDY' Classic problem: avoid hardcoding secret values!

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@weaverryan services: _defaults: bind: $apiKey: '%env(API_KEY)%' // how the compiled code looks $s = new DoorbellRingEventSubscriber(getenv('API_KEY')); API_KEY=ILOVECANDY

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Great! So environment vars are more secure than parameters.yml …right? @weaverryan

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Not Really @weaverryan But they are more flexible

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Let’s read from a Secrets File @weaverryan

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services: _defaults: bind: $apiKey: '%env(key:API_KEY:json:file:SECRETS_FILE)%' (see EnvProcessor) $secretsFile = getenv('SECRETS_FILE'); $data = json_decode( file_get_contents($secretsFile) ); $s = new DoorbellRingEventSubscriber( $data['API_KEY'] );

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How do we define environment variables? @weaverryan

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@weaverryan Use real env vars from your OS! and .env files for defaults+local values

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@weaverryan .env .env.local .env.test .env.test.local .env files? commit gitignore commit gitignore defaults only local values defaults local values Real env vars are never overridden

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@weaverryan Better recipes Better defaults Better experience

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framework: session: cookie_secure: auto cookie_samesite: lax routing: utf8

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@weaverryan Upgrading a flex- enabled app?

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$ git commit $ rm symfony.lock $ rm config/ -r $ rm src/ -r $ composer sync-recipes $ git diff

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$ composer sync-recipes --force $ git diff

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@weaverryan Upgrading a NON flex-enabled app?

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Fully explicit style is still OK

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composer req symfony/flex composer sync-recipes

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Bonus - advanced - slide @weaverryan

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services: App\MyHeavyConnection: tags: - { name: proxy, interface: App\MyConnectionInterface } Works with final classes! \o/

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services: App\MyBlockRender: arguments: - !tagged_locator { tag: block, index_by: block_name } App\SomeBlock: tags: { name: block, block_name: some_block } New in 4.3 use !tagged to get an iterator

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@nicolasgrekas If you think Symfony is awesome Please tell the World! Thank you!