README

Formerly contenir/contenir-cache-mezzio, and before that contenir/cache-mezzio. See UPGRADE-page-cache.md to move from either.

Mezzio (PSR-15) adapter for contenir/contenir-page-cache.

A full-page output cache middleware, controlled by the Contenir admin's Page Cache screen. It is the sibling of contenir/contenir-cache-laminas-mvc: same pagecache config key, same cache_with_* / make_id_with_* options, same route overrides, so a site's settings mean the same thing on either framework.

Requirements

PHP 8.3, 8.4 or 8.5
contenir/contenir-page-cache 2.0+, contenir/contenir-config 2.1+
laminas/laminas-diactoros 3.x, PSR-7, PSR-11, PSR-15, PSR-16 and PSR-20
Optional: laminas/laminas-cache 3.x or 4.x, for the storage the admin's purge buttons understand (see Storage and purging)

The 0.x releases remain available from the 0.x branch and v0.* tags; see UPGRADE-2.0.md.

Install

composer require contenir/contenir-page-cache-mezzio:^2.0@RC

laminas/laminas-component-installer adds Contenir\PageCache\Mezzio\ConfigProvider to config/config.php. Without it, add the provider yourself:

$aggregator = new ConfigAggregator([
    // …
    \Contenir\PageCache\Mezzio\ConfigProvider::class,
    // …
]);

The provider registers PageCacheMiddleware (and the CachePolicy and PageStore it is built from) and declares the pagecache defaults, with caching off.

Configure

Point the middleware at a cache service and set the site's defaults:

// config/autoload/pagecache.global.php

return [
    'pagecache' => [
        // Service name of a Psr\SimpleCache\CacheInterface, or of a
        // Laminas\Cache\Storage\StorageInterface (wrapped for you).
        'cache'   => 'cache.pages',

        // Seconds. Applied to a laminas storage at storage level.
        'ttl'     => 300,

        // The site's defaults. The admin's pagecache.local.php overrides
        // them key by key; `cache` is the master switch.
        'options' => [
            'cache'              => true,
            'cache_with_query'   => true,
            'make_id_with_query' => true,
        ],

        // Regex => option overrides; the last matching pattern wins.
        'routes'  => [
            '/api.*' => ['cache' => false],
        ],
    ],
];

Every key, the options and the route overrides are described in docs/configuration.md.

Pipe it

// config/pipeline.php

$app->pipe(ErrorHandler::class);
$app->pipe(ServerUrlMiddleware::class);
$app->pipe(MaintenanceMiddleware::class);   // a 503 must never be cached, or served from cache
$app->pipe(SessionMiddleware::class);       // if the site has one: authenticated visitors then bypass
$app->pipe(\Contenir\PageCache\Mezzio\PageCacheMiddleware::class);
$app->pipe(RouteMiddleware::class);
// … ImplicitHeadMiddleware, DispatchMiddleware, NotFoundHandler

After maintenance, so a site in maintenance answers 503 rather than a cached page (and a 503 is never stored).
After session, if the site pipes one, so the session attribute is there to recognise a logged-in user. Without it, the session cookie alone stands in for the session.
Before routing, so a hit skips routing and dispatch altogether.

Documentation

Configuration: every pagecache key, the cache_with_* / make_id_with_* options and route overrides.
How it works: bypass, hit and miss rules, and why the admin's file is read on every request.
Extending: vetoing a response, response mutators and the public API.
Storage and purging: PSR-16 and laminas-cache storages, the TTL pitfall and the admin's purge buttons.

Public API

Type	Purpose
`ConfigProvider`	Registers the three factories below and the `pagecache` defaults (`getDependencies()`, `getPageCacheDefaults()`).
`PageCacheMiddleware`	The PSR-15 middleware: `(CachePolicy $policy, PageStore $store, list<ResponseMutatorInterface> $mutators = [])`. `veto(ResponseInterface)` marks a response as not to be stored; `VETO_HEADER` and `STATUS_HEADER` name the headers it uses.
`CachePolicy`	Decides whether a request may use the cache and under which key: `ticketFor(ServerRequestInterface): ?CacheTicket`. `USER_ATTRIBUTE` is the request attribute that marks a logged-in user.
`CacheTicket`	The key and per-path TTL one request reads and writes.
`PageStore`	Reads and writes pages in a PSR-16 cache: `fetch(CacheTicket)`, `save(CacheTicket, ResponseInterface)`.
`CacheResult`	`Hit`, `Miss` or `Bypass`, handed to every mutator.
`ResponseMutatorInterface`	The extension point for per-request changes after storage.
`SystemClock`	The PSR-20 wall clock `PageStore` uses by default.
`Contenir\PageCache\Repository\LayeredFileRepository`	From contenir-page-cache: the admin's file laid over the site's defaults (a `CacheControlRepositoryInterface`).
`PageCacheMiddlewareFactory`, `CachePolicyFactory`, `PageStoreFactory`	Build the services above from `config['pagecache']`; invalid configuration throws `RuntimeException`. `CachePolicyFactory::DEFAULT_FILE` is the admin file's path relative to the working directory.

ActiveOptions, CacheKeyGenerator, PageCacheConfig, PageCodec, SessionInspector and StoredResponse are internal.

Development

The QA toolchain is contenir/contenir-qa-tools. Mago is a standalone binary, installed separately (brew install mago).

composer check             # everything below
composer cs-check          # mago format --check && mago lint
composer static-analysis   # mago analyze
composer test              # unit suite: in-memory caches, clocks, sessions and containers, no I/O
composer test-integration  # integration suite: real admin files and a laminas-cache Filesystem storage
composer test-coverage     # both suites, clover.xml for Codecov
composer mutation-test     # Infection mutation testing over both suites

License

MIT. See LICENSE.

contenir / contenir-cache-mezzio

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