slim

slimframwork 使用 middleware缓存页面

slim cache middleware

中间件 Core\Middleware\Cache

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<?php
namespace Core\Middleware;
class Cache
{
    protected $db;
    //Constructor
    public function __construct($db) {
       $this->db = $db;
    }
    /**
     * Example middleware invokable class
     *
     * @param  \Psr\Http\Message\ServerRequestInterface $request  PSR7 request
     * @param  \Psr\Http\Message\ResponseInterface      $response PSR7 response
     * @param  callable                                 $next     Next middleware
     *
     * @return \Psr\Http\Message\ResponseInterface
     */
    public function __invoke($request, $response, $next)
    {
        $path = $request->getUri()->getPath();
        $query= $request->getUri()->getQuery();
        if(!empty($query)){
            $path.='?'.$query;
        }
        $cachetime=time()-60; //获取60s内的缓存
        $cache=$this->db->get('cache','*',['AND'=>['path'=>$path,'created_at[>]'=>$cachetime]]);
        if($cache){
             $t2=microtime(true);
             $response->getBody()->write(htmlspecialchars_decode($cache['body']).
             '<!--cached at'.date("Y/m/d H:i:s",$cache['created_at']).'-->
             <!--app cost time '.(round(($t2-APP_START),5)*1000).'ms-->');
             return $response;
        }
        $response = $next($request, $response);
        if ($response->getStatusCode() == 200) {
            $id=$this->db->get('cache','id',['path'=>$path]);
            $cachebody=htmlspecialchars($response->getBody());
            $data=['path'=>$path,'body'=>$cachebody,'created_at'=>time()];
            if($id){
                $this->db->update('cache',$data,['id'=>$id]);
            }else{
                $this->db->insert('cache',$data);
            }
        }
        $t2=microtime(true);
        $response->getBody()->write('<!--no cache app cost time '
        .(round(($t2-APP_START),5)*1000).'ms-->');
        return $response;
    }
}

###入口文件index.php调用cache缓存中间件

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<?php
define('APP_START',microtime(true));
require '../vendor/autoload.php';
$app = new Slim\App(
    new \Slim\Container(
        include '../core/container.config.php'
    )
);
$app->group('/blog', function () {
    $this->get('[/{slug}]', 'BlogController')->setName('blog');
    $this->get('/article/{id:[0-9]+}', 'BlogController:article')->setName('blog.post');
})->add(new Core\Middleware\Cache());

###缓存的话,建议使用redis,memcache 下面是使用memcache来缓存的代码

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<?php
namespace Core\Middleware;
class Cache
{
    /**
     * Example middleware invokable class
     *
     * @param  \Psr\Http\Message\ServerRequestInterface $request  PSR7 request
     * @param  \Psr\Http\Message\ResponseInterface      $response PSR7 response
     * @param  callable                                 $next     Next middleware
     *
     * @return \Psr\Http\Message\ResponseInterface
     */
    public function __invoke($request, $response, $next)
    {
        $path = $request->getUri()->getPath();
        $query= $request->getUri()->getQuery();
        if(!empty($query)){
            $path.='?'.$query;
        }
        $memcache_obj = memcache_connect("127.0.0.1", 11211);
        $cache=$memcache_obj->get($path);
        if($cache){
             $t2=microtime(true);
             $response->getBody()->write(htmlspecialchars_decode($cache));
             return $response;
        }
        $response = $next($request, $response);
        if ($response->getStatusCode() == 200) {
            $cachebody=htmlspecialchars($response->getBody());
            $memcache_obj->set($path,$cachebody,false,60);
        }
        $t2=microtime(true);
        $response->getBody()->write('<!--with no memcache app cost time 
        '.(round(($t2-APP_START),5)*1000).'ms-->');
        return $response;
    }
}

没怎么使用过memcache,不过看说明是使用connect连接的,程序执行完,连接会自动关闭.