Mrthdrb

I have implemented holepunching of header in magento, and even though I have got it working on a per customer basis, I need the ability to take this one level deeper by making it work on diff cart item counts too.

Here is my code.

 class AD_PageCache_Model_Container_Header extends Enterprise_PageCache_Model_Container_Abstract 

 protected function _getIdentifier() 
 return $this->_getCookieValue(Enterprise_PageCache_Model_Cookie::COOKIE_CUSTOMER, '');
 

 // public function getCacheKeyInfo() 
 // $info = parent::getCacheKeyInfo();
 // die('boo');
 // $info['cart_count'] = Mage::helper( 'checkout/cart' )->getCart()->getItemsCount();

 // return $info;
 // 

 protected function _getCacheId() 
 //return 'CONTAINER_HEADER_' . md5($this->_placeholder->getAttribute('cache_id') . $this->_placeholder->getAttribute('cart_count') ) . '_' . $this->_getIdentifier();
 return 'CONTAINER_HEADER_' . md5( $this->_placeholder->getAttribute('cache_id') . $this->_getIdentifier() );
 

 protected function _renderBlock() 
 $blockClass = $this->_placeholder->getAttribute('block');
 $template = $this->_placeholder->getAttribute('template');

 $block = new $blockClass;
 $block->setTemplate($template);
 return $block->toHtml();
 

My understanding from what I have been reading from holepunching threads on Magento is that Mage app is not initialized when FPC cache is serving the request, so basically the method of adding a placeholder attribute can't work, since

Mage::helper( 'checkout/cart' )->getCart()->getItemsCount();

won't work, right?

And even though how is that it should be, but it didn't seem to run at all, like I placed a die() call in there but nothing happened.

So what I am missing? And how can I retrieve the cart items count so that it can be used to build the cache ID?

Progress: I found

Enterprise_PageCache_Model_Cookie::COOKIE_CART

but this changes only once upon cart updation. After that it stays same. This is weird, this feels like the solution but its behavior says otherwise.

I couldn't find cart items count in session either. So the only way I currently see to do this would be to save the cart quantity in session whenever it updates and then use that in _getIdentifier().

I found that observers are inconsistent for cart. For addition, updation the events are dispatched but for removal, it doesn't. So I guess I can add my observer to price updation of the quote somehow, if that is consistent in having observers?

Also, I did read Full Page Cache invalidation on cart (quote) change but itt handles using

Enterprise_PageCache_Model_Cookie::COOKIE_CART

which doesn't work well in my case, although I think the problem lies inside it. What/How? I am not sure.

Also the current version of EE we have running doesn't even have
Advanced folder under Model/Container. I am using EE 1.10.1.1

Any suggestions?

Using Enterprise_PageCache_Model_Cookie::COOKIE_CART is the right way to go, but you may need to do some changes.

Enterprise_PageCache_Model_Observer::registerQuoteChange is called on every quote save (item number change included) and it is also called in the context on Mage::app() so you can access all session data. Overwrite this observer and add more data in $this->_getCookie()->setObscure so the value changes whenever you need to.