Implementation Patterns

Symfony 2.x Integration

Bundle Registration: Add to AppKernel.php:
```
new Dflydev\EmbeddedComposerBundle\DflydevEmbeddedComposerBundle(),
```
- Note: Symfony 2.x uses AppKernel, not Kernel.php.

Configuration: Override Composer settings via config.yml:

dflydev_embedded_composer:
    config:
        repositories:
            - type: vcs
              url: 'git@github.com:vendor/package.git'
        extra:
            installer-paths: { 'src/': ['type:library'] }

Use Case: Dynamically configure Composer repositories or installer paths.

Service Injection: Access Composer via Symfony’s container:
```
$composer = $this->get('dflydev_embedded_composer.composer');
$composer->runCommand('require', ['monolog/monolog']);
```
- Use Case: Programmatically trigger Composer commands (e.g., in a controller or command).

Custom Composer Logic

Command Extensions: Create a custom Symfony command to wrap Composer actions:

use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;

class CustomComposerCommand extends Command
{
    protected function execute(InputInterface $input, OutputInterface $output)
    {
        $composer = $this->getContainer()->get('dflydev_embedded_composer.composer');
        $composer->runCommand('update', ['--no-dev' => true]);
        $output->writeln('Dependencies updated!');
    }
}

Use Case: Build domain-specific Composer workflows (e.g., "update production dependencies").

Event Listeners: Hook into Composer events (e.g., post-install-cmd) to extend behavior:

$dispatcher->addListener(
    'dflydev_embedded_composer.command.post-install-cmd',
    function () {
        // Post-install logic (e.g., cache warming, notifications)
    }
);

Use Case: Automate post-install tasks (e.g., optimize autoloader, run migrations).

Dependency Resolution: Use Composer’s API to inspect or modify dependencies:
```
$composer = $this->get('dflydev_embedded_composer.composer');
$lock = $composer->getLock();
$packages = $lock->getPackages();
```
- Use Case: Dynamic dependency analysis (e.g., feature flags, security audits).

Workflow Integration

CI/CD Pipelines: Embed Composer in a Symfony-based CI tool to manage dependencies without requiring Composer globally:
```
# .github/workflows/ci.yml
jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - run: php bin/console embedded-composer:install
```
- Use Case: Self-contained dependency management in isolated environments.
Legacy Migration: Gradually migrate Symfony 2.x apps by embedding Composer for dynamic updates:
```
// In a migration script
$composer = $this->get('dflydev_embedded_composer.composer');
$composer->runCommand('require', ['doctrine/orm:^2.0']);
```
- Use Case: Incrementally upgrade dependencies before full framework migration.

Self-Service Portals: Expose Composer functionality to end-users via a Symfony frontend:

// Controller action
public function installDependencies()
{
    $composer = $this->get('dflydev_embedded_composer.composer');
    $composer->runCommand('require', [$this->request->get('package')]);
    return new Response('Installed!');
}

Use Case: Internal dev portals or SaaS platforms with custom dependency management.

Symfony-Specific Tips

Parameter Binding: Use Symfony’s parameter bag to configure Composer dynamically:

# config.yml
parameters:
    embedded_composer_repo: 'https://custom-repo.example.com'

dflydev_embedded_composer:
    config:
        repositories:
            - { type: composer, url: '%embedded_composer_repo%' }

Twig Integration: Expose Composer status to templates:

{# templates/base.html.twig #}
{% if app.container.get('dflydev_embedded_composer.composer').isInstalled() %}
    <p>Dependencies are up-to-date.</p>
{% else %}
    <p>Run `php bin/console embedded-composer:install` to update.</p>
{% endif %}

Security Context: Restrict Composer access to trusted roles:

# security.yml
access_control:
    - { path: ^/admin/composer, roles: ROLE_ADMIN }

Debugging & Logging

Enable Debug Mode:
```
php bin/console debug:config dflydev_embedded_composer
```
- Inspect Composer configuration and service bindings.

Log Composer Output: Redirect Composer logs to Symfony’s logger:

$composer = $this->get('dflydev_embedded_composer.composer');
$composer->setLogger($this->get('logger'));
$composer->runCommand('install');

Dry Runs: Test Composer commands without side effects:
```
php bin/console embedded-composer:install --dry-run
```

Extending the Bundle

Custom Composer Classes: Override Composer’s core classes via Symfony’s compiler passes:

use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
use Symfony\Component\DependencyInjection\ContainerBuilder;

class CustomComposerPass implements CompilerPassInterface
{
    public function process(ContainerBuilder $container)
    {
        $definition = $container->findDefinition('dflydev_embedded_composer.composer');
        $definition->setClass('App\Custom\ComposerWrapper');
    }
}

New Console Commands: Extend the bundle’s command namespace:

namespace App\Command;

use Dflydev\EmbeddedComposerBundle\Command\AbstractComposerCommand;

class CustomComposerCommand extends AbstractComposerCommand
{
    protected function configure()
    {
        $this->setName('app:composer:custom');
    }
}

Event Subscribers: Listen to Composer events globally:

use Dflydev\EmbeddedComposer\Event\ComposerEvent;

class ComposerSubscriber implements EventSubscriberInterface
{
    public static function getSubscribedEvents()
    {
        return [
            'dflydev_embedded_composer.command.pre-install-cmd' => 'onPreInstall',
        ];
    }

    public function onPreInstall(ComposerEvent $event)
    {
        // Pre-install logic
    }
}

Gotchas and Tips

Pitfalls

Symfony 2.x Only:
- Error: Class 'Symfony\Component\DependencyInjection\Loader\YamlFileLoader' not found if using Symfony 3+.
- Fix: Pin Symfony to 2.1–2.3 in composer.json:
```
"symfony/symfony": "2.8.*"
```
Composer 1.x Quirks:
- Issue: Composer 1.x lacks modern features (e.g., composer.json schema validation).
- Workaround: Manually validate composer.json before passing it to the bundle.
PHP 5.3.2 Limitations:
- Problem: No support for namespaces, traits, or modern PHP features.
- Solution: Use a Docker container with PHP 5.6 + composer/composer:1.10 for compatibility.
Service Container Conflicts:
- Error: Service "dflydev_embedded_composer.composer" not found.
- Fix: Ensure the bundle is loaded before other bundles that might override services.

Lock File Handling:

Gotcha: The bundle may not respect composer.lock by default.

Fix: Configure explicitly:

dflydev_embedded_composer:
    config:
        files:
            - composer.json
            - composer.lock

Plugin Incompatibility:
- Issue: Composer plugins (e.g., composer/installers) may not work.
- Workaround: Use --no-plugins flag or manually install plugins.
Memory Limits:
- Problem: Embedded Composer may hit memory limits for large projects.
- Fix: Increase PHP memory limit in php.ini

Embedded Composer Bundle Laravel Package