1. Fabrizio Balliano
Tracking visitors despite Varnish
MMeeeett MMaaggeennttoo PPoollaanndd 22001144

2. Meet Magento Poland 2014
Who am I
Fabrizio Balliano
PHP since 1999
Magento since 2007
MCD MCD+ MCFD MCSS
magento.com/it admin
Full time Magento since 2011
CTO of Sevenlike Srl
@fballiano

3. What is Varnish
Web application accelerator
HTTP reverse proxy
Cache server
Maybe full RAM solution
Tremendous speed gain
Saves CPUs
Saves network traffic
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4. What is Varnish for Magento
Full Page Cache
Pre rendered HTML pages
Static assets
JS/CSS
Images
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5. A sample infrastructure
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6. Visitor path – page not in cache
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7. Visitor path – page in cache
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8. The problem is...
The web servers
never know
about a visit
to a cached page
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9. Most modern tracking softwares
(actually services)
are javascript based
anyone said Google Analytics?
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10. What about tracking visitors
inside Magento?
Customize browsing experience
based on visitor's behavior
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11. An example
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12. But... if the frontend server are
not getting the request...
Simple, this feature and any
other tracking will not work.
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13. But... notice anything here?
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14. Dynamic blocks!
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15. Dynamic blocks
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ESI: Edge Side Includes
Not visible to client
Before page load
Can be cached
– whole site/one page
– each user/all
NO COOKIES!
Little data transported
AJAX
Visible to client
After page load
Can NOT be cached
COOKIES!
A lot of data

16. Configuration reference
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17. Let's add a new dynamic block!
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Hey, wait!
Every call to the frontend
servers matters!

18. Can we reach our goal
without adding a new
ESI/AJAX dynamic block?
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19. Flash messages!
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20. Flash messages:
let's extend them
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21. Flash messages:
let's extend them
class Fballiano_TurpentineRecentlyViewed_Block_Messages extends
Nexcessnet_Turpentine_Block_Core_Messages
{
public function _prepareLayout()
{
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// code to do whatever we want
return parent::_prepareLayout();
}
}

22. Meet Magento Poland 2014
Dziękuję!
http://fabrizioballiano.it
http://twitter.com/fballiano
http://linkedin.com/in/fabrizioballiano
http://www.sevenlike.com