guzzle-cache-middleware

A HTTP Cache for Guzzle 6. It's a simple Middleware to be added in the HandlerStack.

Goals

• RFC 7234 compliance
• Performance and transparency
• Assured compatibility with PSR-7

Installation

composer require kevinrob/guzzle-cache-middleware

or add it the your composer.json and make a composer update kevinrob/guzzle-cache-middleware.

Why?

Performance. It's very common to do some HTTP calls to an API for rendering a page and it takes times to do it.

How?

With a simple Middleware added at the top of the HandlerStack of Guzzle6.

use GuzzleHttp\Client;
use GuzzleHttp\HandlerStack;
use Kevinrob\GuzzleCache\CacheMiddleware;

// Create default HandlerStack
$stack = HandlerStack::create();

// Add this middleware to the top with `push`
$stack->push(new CacheMiddleware(), 'cache');

// Initialize the client with the handler option
$client = new Client(['handler' => $stack]);

You can use a cache from Doctrine/Cache:

[...]
use Doctrine\Common\Cache\FilesystemCache;
use Kevinrob\GuzzleCache\Strategy\PrivateCacheStrategy;
use Kevinrob\GuzzleCache\Storage\DoctrineCacheStorage;

[...]
$stack->push(
  new CacheMiddleware(
    new PrivateCacheStrategy(
      new DoctrineCacheStorage(
        new FilesystemCache('/tmp/')
      )
    )
  ), 
  'cache'
);

You can use ChainCache for using multiple CacheProvider. With that provider, you have to sort the different cache from the faster to the slower. Like that, you can have a very fast cache.

[...]
use Doctrine\Common\Cache\ChainCache;
use Doctrine\Common\Cache\ArrayCache;
use Doctrine\Common\Cache\FilesystemCache;
use Kevinrob\GuzzleCache\Strategy\PrivateCacheStrategy;
use Kevinrob\GuzzleCache\Storage\DoctrineCacheStorage;

[...]
$stack->push(new CacheMiddleware(
  new PrivateCacheStrategy(
    new DoctrineCacheStorage(
      new ChainCache([
        new ArrayCache(),
        new FilesystemCache('/tmp/'),
      ])
    )
  )
), 'cache');

It's possible to add a public shared cache to the stack:

[...]
use Doctrine\Common\Cache\FilesystemCache;
use Doctrine\Common\Cache\PredisCache;
use Kevinrob\GuzzleCache\Strategy\PrivateCacheStrategy;
use Kevinrob\GuzzleCache\Storage\DoctrineCacheStorage;

[...]
// Private caching
$stack->push(
  new CacheMiddleware(
    new PrivateCacheStrategy(
      new DoctrineCacheStorage(
        new FilesystemCache('/tmp/')
      )
    )
  ), 
  'private-cache'
);

// Public caching
$stack->push(
  new CacheMiddleware(
    new PrivateCacheStrategy(
      new DoctrineCacheStorage(
        new PredisCache(
          new Predis\Client('tcp://10.0.0.1:6379')
        )
      )
    )
  ), 
  'shared-cache'
);