CDN / Edge Cache Extension for Glueful

Overview

CDN adds edge-cache integration to your Glueful application: it generates edge cache-control headers, purges cached content (by URL, by tag, or all), and ships a pluggable provider-adapter system so you can target Cloudflare, Fastly, or any custom CDN.

It plugs into the framework through the Glueful\Cache\Contracts\EdgeCacheInterface seam: installing the extension binds that interface to a real edge-cache purger, and the framework's response caching (ResponseCachingTrait) consumes generateCacheHeaders() through the same interface automatically — no app code change required. When no CDN provider is configured, the extension degrades gracefully to a disabled no-op so response handling keeps working unchanged.

Features

• Edge cache headers: generates cache-control headers for edge-cached responses, consumed automatically by the framework's response caching
• Cache purging: purge by URL, by tag, or purge everything, through the configured provider adapter
• Pluggable adapters: a provider name → adapter class map lets you target Cloudflare, Fastly, or any custom CDN
• Third-party adapters: any package can register its own adapter by merging an entry into the cdn.adapters map
• Degrade-to-disabled: never throws on misconfiguration — silently no-ops (exactly like a null edge cache) when no valid provider resolves
• cache:purge command: CLI purging by URL, tag, or all
• Seam-based: binds the core EdgeCacheInterface; the framework works with or without the extension installed
• Configurable: provider, TTL, and per-route rules via the cdn config + EDGE_CACHE_* env

Installation

Installation (Recommended)

Install via Composer

composer require glueful/cdn

# Rebuild the extensions cache after adding new packages
php glueful extensions:cache

Composer discovers packages of type glueful-extension, but installing does not auto-enable them — the provider must be added to config/extensions.php's enabled allow-list. The CLI does that for you:

# Enable (adds the provider FQCN to config/extensions.php + recompiles the cache)
php glueful extensions:enable cdn

# Disable (removes it)
php glueful extensions:disable cdn

In production, manage the enabled list in config and run php glueful extensions:cache in your deploy step. The extension ships no migrations.

Local Development Installation

To develop the extension locally, register it as a Composer path repository in your app's composer.json, then require and enable it:

// composer.json
"repositories": [
    { "type": "path", "url": "extensions/cdn", "options": { "symlink": true } }
]

composer require glueful/cdn:@dev
php glueful extensions:enable cdn

Entries in config/extensions.php are plain string FQCNs (no ::class) — prefer extensions:enable over editing by hand.

Verify Installation

php glueful extensions:list
php glueful extensions:info cdn
php glueful extensions:diagnose

Post-install checklist:

• Rebuild cache after Composer operations: php glueful extensions:cache
• Confirm the seam is bound: resolving Glueful\Cache\Contracts\EdgeCacheInterface yields Glueful\Extensions\Cdn\EdgeCachePurger
• Set EDGE_CACHE_ENABLED=true and a EDGE_CACHE_PROVIDER mapped in cdn.adapters to activate purging

Configuration

Configuration is loaded from the extension's config/cdn.php and merged under the cdn key by the service provider. It reads the standard EDGE_CACHE_* environment variables:

return [
    // Master switch for edge caching.
    'enabled' => env('EDGE_CACHE_ENABLED', false),

    // CDN provider name. EMPTY by default — no vendor bias is shipped.
    // Must match a key in the `adapters` map below to resolve an adapter.
    'provider' => env('EDGE_CACHE_PROVIDER', ''),

    // Default TTL (seconds) for edge-cached responses.
    'default_ttl' => env('EDGE_CACHE_TTL', 3600),

    // Route-specific cache rules.
    'rules' => [
        // 'home' => ['ttl' => 600, 'vary_by' => ['Accept-Encoding']],
    ],

    // Provider name -> adapter class map (see "Registering an adapter").
    'adapters' => [],
];

EdgeCachePurger has its configuration injected (the CdnServiceProvider factory passes config($context, 'cdn', [])), so the cdn config key is the single source of truth and the purger stays unit-testable with any config array.

Registering an adapter

Provider resolution is driven by two config values:

1. cdn.provider — the active provider name (a string).
2. cdn.adapters — a name => adapter-class map.

On construction the purger looks up adapters[provider], requires the class to exist and implement CDNAdapterInterface, and instantiates it with the full cdn config array. Enable an adapter by mapping its name to its class and selecting it:

// config/cdn.php
'provider' => 'cloudflare',
'adapters' => [
    'cloudflare' => \Glueful\Extensions\Cdn\Adapters\CloudflareAdapter::class,
],

Third-party adapters

Any package can ship its own adapter. It registers by merging its name => class entry into cdn.adapters — for example from its own ServiceProvider::register():

public function register(ApplicationContext $context): void
{
    $this->mergeConfig('cdn', [
        'adapters' => [
            'acme' => \Acme\Cdn\AcmeAdapter::class,
        ],
    ]);
}

The user then selects it by setting EDGE_CACHE_PROVIDER=acme (or cdn.provider => 'acme'). The adapter class must implement Glueful\Extensions\Cdn\Adapters\CDNAdapterInterface (extending AbstractCDNAdapter is the easy path).

Degrade-to-disabled behavior

EdgeCachePurger never throws during adapter resolution. It silently degrades to a disabled state (every method no-ops exactly like a null edge cache) when:

• cdn.provider is unset/empty (normal "off" config — not logged);
• cdn.provider names a key absent from cdn.adapters (not logged);
• the mapped class does not exist, is not a CDNAdapterInterface, or its constructor throws (logged as a warning via the PSR-3 logger, falling back to error_log).

While disabled: isEnabled() → false, getProvider() → null, generateCacheHeaders() → [], and all purge calls → false. This means misconfiguration never breaks response handling. isEnabled() additionally requires cdn.enabled to be truthy and an adapter to have resolved.

Usage

Purging via the container

use Glueful\Cache\Contracts\EdgeCacheInterface;

$edge = container($context)->get(EdgeCacheInterface::class);

if ($edge->isEnabled()) {
    $edge->purgeUrl('https://example.com/page');
    $edge->purgeByTag('products');
    $edge->purgeAll();
}

Response caching consumes generateCacheHeaders() through the same interface automatically — no app code change is needed once the extension is installed and a provider is configured.

Purging via the CLI

php glueful cache:purge --all
php glueful cache:purge --url=https://example.com/page
php glueful cache:purge --tag=products

Requirements

• PHP 8.3 or higher
• Glueful 1.52.0 or higher

License

MIT — licensed consistently with the Glueful framework.

Support

For issues, feature requests, or questions, please create an issue in the repository.