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H o r r i b l e T r u t h 1
Drupal is written in PHP, which is uttterly
offensive to people.
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H o r r i b l e T r u t h 2
Drupal loads too much code -rasmus
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Is Drupal too Modular?

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H o r r i b l e T r u t h 4
Drupal is basically a 404 page to which you can
add modules
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drupal_bootstrap(DRUPAL_BOOTSTRAP_FULL)

index.php includes/bootstrap.inc - load necessary
functions drupal_page_header() starts timer, sets
up caching, module callout includes/common.inc -
utility functions such as path formatting
functions, form generation and validation, etc.
fix_gpc_magic() sets status 404 switch - case
Not Found case Access Denied drupal_page_footer()
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drupal_bootstrap(DRUPAL_BOOTSTRAP_FULL)

drupal_load() drupal_not_found() drupal_access_de
nied() drupal_site_offline() return
menu_execute_active_handler() print
theme('page', return) drupal_page_footer()
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What's on the menu api?

MENU_CALLBACK MENU_DEFAULT_LOCAL_TASK MENU_LOCA
L_TASK MENU_MAX_DEPTH MENU_MAX_PARTS MENU_NORMA
L_ITEM MENU_SUGGESTED_ITEM MENU_CALLBACK MENU_D
EFAULT_LOCAL_TASK MENU_LOCAL_TASK MENU_MAX_DEPTH
MENU_MAX_PARTS MENU_NORMAL_ITEM MENU_SUGGESTED
_ITEM
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Scream API

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H o r r i b l e T r u t h 7
The Dreaded Hooks of Torture
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Hooks of Torture
to implement a hook, create a function that
'extends' hooks into an existing hook (hook
function) not functions but can be
overloaded call user function array used to
make dynamic function calls
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module_invoke_all

• lt?php
• function module_invoke_all()
• args func_get_args()
• hook args0
• unset(args0)
• return array()
• foreach (module_implements(hook) as module)
• function module .'_'. hook
• result call_user_func_array(function,
  args)
• if (isset(result) is_array(result))
• return array_merge_recursive(return,
  result)
• else if (isset(result))
• return result
• return return

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hook_admin

• /
• channels_admin
• implements hook_admin
• Provides channels admin form to save settings
  for the following fields
• /
• function channels_admin()
• form'channels' array(
• 'type' gt 'textfield',
• 'title' gt t('Channel'),
• 'default_value' gt variable_get('channels',
  ''),
• 'size' gt 25,
• 'maxlength' gt 128,
• 'description' gt t("channel_theme"),
• 'required' gt TRUE,
• )
• return system_settings_form(form)

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hook_perms

• /
• Implements hook_perm().
• /
• function channels_perm()
• return array(
• 'access channel content',
• 'administer channels',
• )

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hook_menu

• /
• Implements hook_menu().
• anne/
• function channels_menu()
• items array()
• items'admin/settings/channels' array(
• 'title' gt 'channel settings',
• 'description' gt 'select channel',
• 'page callback' gt 'drupal_get_form',
• 'page arguments' gt array('channels_admin'),
• 'access arguments' gt array('administer
  channels'),
• 'type' gt MENU_NORMAL_ITEM,
• )
• return items

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hook_block

• /
• Implementation of hook_block().
• /
• function channels_block(op 'list', delta 0,
  edit array())
• switch (op)
• case 'list'
• blocks0'info' t('current_channel')
• return blocks
• case 'view'
• totals _channels_get_theme()
• if (!empty(webstream))
• content theme('channels_current_theme',
  webstream)
• blocks'subject' t('You're What's
  On!')
• blocks'content' content
• return blocks

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hook_menu_alter

• / Implementation of hook_menu_alter(). /
• function noaccess_menu_alter(items)
• items'node''access arguments'
  array('access node path')
• / Implementation of hook_perm(). /
• function noaccess_perm()
• return array('access node path')

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Hook Soup
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Does Drupal have a Learning Curve...

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or a Learning Brick Wall ?

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Community Plumbing

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Product!
Framework!
Drupal is a Pushme - Pullyou
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Field API

• What's
• a
• Node?

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H o r r i b l e T r u t h 9
Drupal Isn't 'Classy'?
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H o r r i b l e T r u t h 10
Drupal isn't Object Oriented?
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DRUPAL DESIGN PATTERN
Drupal Design Pattern
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REALITY CHECK.
Drupal Design Pattern
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Drupal Anti-Pattern

Load Everything then Cherry Pick What You
Need.
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H o r r i b l e T r u t h 11
Drupal Encourages Slavery
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Making Drupal Slave Safe!
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Actions Triggers
(not slave safe)
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Database TNG
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Performance Scaling

• Sample Metrics from a large Drupal site
• 50 million page views per month
• 6.5 million site visitors per month
• 150,000 page views per hour
• load tests to levels of greater than 500,000 page
  views per hour
• Drupal.org delivers approximately 1M/day/month

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Object Caching

• APC
• Advantages
• Low latency
• No need to serialize/unserialize items
• Scales perfectly with more web servers
• Disadvantages
• No enforced consistency across multiple
  web servers
• Cache is not shared each web server must
  generate each item
• memcached
• Advantages
• Consistent across multiple web servers
• Cache is shared across all web servers items
  only need to be generated once
• Disadvantages
• High latency
• Requires serializing/unserializing items
• Easily shards data across multiple web servers,
  but is still a big, shared cache

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Cache Headers
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drush

• Download and enable devel module
• drush dl devel
• drush enable devel
• Run cron
• drush cron
• Refresh modules and core updates
  informartion
• drush refresh
• Take a snapshot of the DB
• drush sql dump gt mydb.sql
• Open a mysql console for running SQL
  commands into Drupal DB
• drush sql cli
• Clear Drupal cache
• drush cache clear

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drush
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drush_make
core "7.x" projects "drupal" projects
"acquia_connector" projectsapachesolrdownloa
dtype "cvs" projectsapachesolrdownloadmo
dule "contributions/modules/apachesolr" project
sapachesolrdownloadrevision
"DRUPAL-7--0" projectsacquia_searchtype
"module" projectsacquia_searchdownloadtype
"svn" projectsacquia_searchdownloadurl
"https//svn.acquia.com/drupal/branches/1.x-7.x/mo
dules/acquia/acquia_search/" librariesSolrPhpCli
entdownloadtype "get" librariesSolrPhpClie
ntdownloadurl "http//solr-php-client.googl
ecode.com/files/SolrPhpClient.r22.2009-11-09.tgz"
librariesSolrPhpClientdestination
"modules/apachesolr"
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Automated Backup

• touch /.logrotate.state /.logrotate.config
• emacs /.logrotate.config
• /backup/dev.sql.gz
• rotate 7
• daily
• nocompress
• nocopytruncate
• postrotate
• /usr/bin/drush -r /web.root.org/web/
  sql dump gzip gt /backup/dev.sql.gz
• endscript
• /usr/bin/drush -r /web.root.org/web/ sql dump
  gzip gt /backup/dev.sql.gz

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