Horrible Truth 1
“Drupal is written in PHP,
which is uttterly
offensive to people.”
Horrible Truth 2
“Drupal loads
too much code”
-rasmus
Is Drupal too Modular?
Horrible Truth 4
“Drupal is basically a
404 page to which you
can add modules””
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()
drupal_bootstrap(DRUPAL_BOOTSTRAP_FULL);
drupal_load()
drupal_not_found();
drupal_access_denied();
drupal_site_offline();
$return =
menu_execute_active_handler();
print theme('page', $return);
drupal_page_footer();
What's on the menu api?
MENU_CALLBACK
MENU_DEFAULT_LOCAL_TASK
MENU_LOCAL_TASK
MENU_MAX_DEPTH
MENU_MAX_PARTS
MENU_NORMAL_ITEM
MENU_SUGGESTED_ITEM
MENU_CALLBACK
MENU_DEFAULT_LOCAL_TASK
MENU_LOCAL_TASK
MENU_MAX_DEPTH
MENU_MAX_PARTS
MENU_NORMAL_ITEM
MENU_SUGGESTED_ITEM
Scream API
Horrible Truth 7
The Dreaded
Hooks of Torture
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
module_invoke_all
<?php
function module_invoke_all() {
$args = func_get_args();
$hook = $args[0];
unset($args[0]);
$return = array();
foreach (module_implements($hook) as
$module) {
$function = $module .'_'. $hook;
$result =
call_user_func_array($function,
$args);
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' => 'textfield',
'#title' => t('Channel'),
hook_perms
/**
* Implements hook_perm().
*/
function channels_perm() {
return array(
'access channel content',
'administer channels',
);
}
hook_menu
/**
* Implements hook_menu().
anne/
function channels_menu() {
$items = array();
$items['admin/settings/channels'] =
array(
'title' => 'channel settings',
'description' => 'select channel',
'page callback' =>
'drupal_get_form',
'page arguments' =>
hook_block
/**
* Implementation of hook_block().
*/
function channels_block($op = 'list',
$delta = 0, $edit = array()) {
switch ($op) {
case 'list':
$blocks[0]['info'] =
t('current_channel');
return $blocks;
case 'view':
$totals = _channels_get_theme();
hook_menu_alter
/** Implementation of
hook_menu_alter(). */
function noaccess_menu_alter(&$items) {
$items['node']['access arguments'] =
array('access node path');
}
/** Implementation of hook_perm().
function noaccess_perm() {
return array('access node path');
*/
Hook Soup
Does Drupal have a Learning Curve...
…or a Learning Brick Wall ?
“Community Plumbing”
Product!
Framework!
Drupal is a Pushme - Pullyou
Field API
What's
a
Node?
Horrible Truth 9
“Drupal Isn't
'Classy”'?
H o r r i b l e T r u t h 10
“Drupal isn't
Object
Oriented?”
DRUPAL DESIGN PATTERN
Drupal Design Pattern
REALITY CHECK.
Drupal Design Pattern
Drupal Anti-Pattern
“Load Everything
then
Cherry Pick What You
Need.”
H o r r i b l e T r u t h 11
Drupal
Encourages
Slavery
Making Drupal “Slave Safe!”
Actions* & Triggers
*(not slave safe)
Database TNG
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
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
Cache Headers
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 > mydb.sql
* Open a mysql console for running SQL
commands into Drupal DB:
drush
drush_make
core = "7.x"
projects[] = "drupal"
projects[] = "acquia_connector"
projects[apachesolr][download][type] = "cvs"
projects[apachesolr][download][module] = "contributions/modules/apachesolr"
projects[apachesolr][download][revision] = "DRUPAL-7--0"
projects[acquia_search][type] = "module"
projects[acquia_search][download][type] = "svn"
projects[acquia_search][download][url] = "https://svn.acquia.com/drupal/branches/1.x7.x/modules/acquia/acquia_search/"
libraries[SolrPhpClient][download][type] = "get"
libraries[SolrPhpClient][download][url] = "http://solr-phpclient.googlecode.com/files/SolrPhpClient.r22.2009-11-09.tgz"
libraries[SolrPhpClient][destination] = "modules/apachesolr"
Automated Backup
touch
~/.logrotate.state
~/.logrotate.config
emacs ~/.logrotate.config
~/backup/dev.sql.gz {
rotate 7
daily
nocompress
nocopytruncate