Support closures when using cache

[tienv2i]

I got an error when I use cachedDispatcher, I is normal when I use simpleDispatcher
The error is:

Fatal error: Call to undefined method Closure::__set_state() in E:\biiblog\src\Bii\route.cache on line 7

This is my code:

    function &dispatch()
    {
        $dispatcher = \FastRoute\cachedDispatcher(
            function(\FastRoute\RouteCollector $r){
                foreach ($this->routers as $router) {
                    $r->addRoute($router['method'],$router['route'] ,$router['handler']);
                }
        },[
            'cacheFile' => __DIR__ . '/route.cache', /* required */
        ]);

        $uri=isset($_SERVER['PATH_INFO'])?rtrim($_SERVER['PATH_INFO'],'\/'):"/";

        $method=$_SERVER["REQUEST_METHOD"];
        $routeInfo=$dispatcher->dispatch($method, $uri);

        switch($routeInfo[0]) {
            case \FastRoute\Dispatcher::NOT_FOUND:
                //NOT FOUND
                die("Page not found");
                break;
            case \FastRoute\Dispatcher::METHOD_NOT_ALLOWED:
                //NOT ALLOWED
                die("Method not allowed");
                break;
            case \FastRoute\Dispatcher::FOUND:
                $handler = $routeInfo[1];
                $vars = $routeInfo[2];

                if (is_callable($handler)){
                    $this->displayData=$handler($vars);
                }
                elseif(is_string($handler) && preg_match_all('#^([A-Za-z\\\]+)@([A-Za-z]+)#',$handler, $matches))
                {
                    if(class_exists($matches[1][0]) && is_callable(array($matches[1][0],$matches[2][0])) )
                    {
                        $class=new $matches[1][0];
                        $action=$matches[2][0];
                        $this->displayData=$class->$action($vars);
                    }
                    else
                    {
                        die($handler.' is invalid');
                    }
                }else
                {
                    die('Route is not callable!');
                }
                // ... call $handler with $vars
                break;
        }
        return $this;
    }

[staabm]

Fatal error: Call to undefined method Closure::__set_state() in E:\biiblog\src\Bii\route.cache on line 7

the error message sounds like you try to serialize()/var_export() a Closure object which seems to not support this kind of operation.

[tienv2i]

I found that it has that when I use handler as a function. It is normal when I use handler as a string. Is there any way to fix this?

This has error:

$r->addRoute('GET', '/phpinfo', function()
    {
        phpinfo();
    }); 

This works well:

$r->addRoute('GET', '/phpinfo', 'phpinfo'); 

[staabm]

for the "builtin php Closures are not serializable" problem, exists a separate lib
https://github.com/jeremeamia/super_closure

your caching adapter needs to take care of that, in case you really wanne cache such Closure style routes.
not a FastRoute issue though.

[nikic]

A possible workaround that avoids super_closure:

Closures generally don't play well with any kind of caching (they aren't even serializable). The standard way to solve this is to replace the closures with a unique identifier (say, an incrementing number) and have a map from that identifier to the closure. The second map will have to be always reconstructed at runtime, that's unavoidable.

In any case, the README should explicitly mention that closures as handlers cannot be cached.

[smallfish500]

Accepting closure serialization (@staabm) or explicitly mentioning it unsupported inda doc (@nikic)? Why not adding flexibility to the $handler parameter (as strictness remains not de rigueur while using php) ?
https://opis.io/closure

[lcobucci]

@smallfish500 we should mention it in the docs for sure.

For v2.0 we need to look at which approach to take to make things cacheable. I'd say having the map sounds more appealing to me than introducing new dependencies but we need to explore these options and benchmark things.