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MAGENTO 2 AND AVOIDING THE
RABBIT HOLE
Tony Brown

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Imagine…
• You’re on the “learn Magento 2” journey
• You hit a tricky problem which isn’t easy to
diagnose
• What do you do?
• How can you avoid losing time when learning /
fixing problems?

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• Worked on Magento since 1.2
• Technical Director @ Space 48
• Love learning and collaborating

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Overview
• Magento 1 to Magento 2
• A learning / debugging technique
• Magento 2 development environment
• Problem solving example in M2

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Magento 1 to Magento 2
• Architecture changes
• Makes it easier to write tests
• More isolation of code
• More component friendly
• Mechanisms for more targeted changes
• Test coverage

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What does this mean?
• Your WTF per minute rate is going to increase for a
while!

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Learning / Debugging Technique
• Debugging and Magento : https://youtu.be/xCjPQfuxxxQ
• Time can run away
• Regularly stepping back
• Pomodoro technique

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Dev Environment / Infrastructure
• VM via Vagrant
• Nginx, PHP-PFM (v7) with Xdebug
• Percona MySql
• Varnish
• SSL

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Varnish
Nginx
8080
HTTP
80
Varnish
Nginx
8080
HTTPS
80
Nginx
443

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Problem Solving Example

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The problem
Varnish for Full Page Cache
+
SSL for the front-end
=
No navigation menu in Luma

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Research for M2 FPC
• Magento Stackexchange
• Same problem, but no answers! http://goo.gl/xK7VQi
• Alan Kent article
• http://devdocs.magento.com
• Other blog posts inc. Alan Storm: http://goo.gl/o4Z107

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FPC with Varnish
• Varnish holds content responses for URL requests
• Magento decides if a page should be cached or not
• Ajax is used for private data
• ESI is used for finer control of public cache

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Debugging Steps
• Are there any errors in the Magento Logs?
• Are there any console errors?
• Examine the HTML output?

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Output over HTTPS

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Output over HTTP

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Debugging Steps
• Examine Varnish cache headers

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Debugging Steps
• Find the block definition
/vendor/magento/module-theme/view/frontend/layout/default.xml

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Debugging Steps
• Step through the code:
• /vendor/magento/module-page-cache/Model/
App/FrontController/VarnishPlugin.php

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HTTPS = Not working
HTTP = working

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Debugging Steps
• Visit the ESI Controller directly

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HTTPS HTTP
magento2.local/page_cache/block/esi/blocks/[%22catalog.topnav%22]/
handles/…

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Debugging Steps
• Verify the ESI Controller is being called by Varnish

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Debugging Steps
• Looking for Varnish logs?… use varnishlog

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Debugging Steps
• Search for the error
• An old Varnish ticket was found:
By default ignore an <esi:include> with src=" https://..."
Feature +esi_ignore_https treats it as http://... instead.

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Debugging Steps

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Conclusion
• Magento 2 has a tricky learning curve
• Take regular breaks to avoid wasting time
• The Varnish FPC implementation is pretty cool!

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THANKS!!
Any questions?