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Daemon mode

Daemon mode

Owned by Alex
Last updated: Aug 08, 2015

Imported from: http://groups.google.com/group/in-portal-dev/browse_thread/thread/4ddcf57e2c5e33aa#

There are situation, when there is a need to process large amounts of data in short time. 

To do that I propose to minimize action count, that In-Portal performs during it's initialization including:

  • doing database queries that won't help to perform requested action (e.g. loading phrase cache, when phrase are not used at all)
  • performing initialization of system parts that are not used (e.g. session initialization, when no login is made)

In total In-Portal is temporarily converted to sort of unix-like daemon (standalone service), that quickly performs given requests. That's why I called such operation mode as "daemon mode". 

Usage (one of following):

  • add $_CONFIG['Misc']['DaemonMode'] = '1'; to "system/config.php" file when system-wide daemon mode is required
  • add define('DAEMON', 1); in PHP file, where daemon mode is required (e.g. cron.php, run_event.php, index.php, etc.); it should happen before FULL_PATH constant definition

Tables never used in daemon mode:

  • CachedUrls (mod-rewrite caching won't work)
  • PhraseCache (phrase and configuration variable caching won't work)
  • Counters (counters, like member count won't work)
  • ThemeFiles (for mod-rewrite url parsing)
  • CustomField (no custom field data can be accessible)
  • Forms (new forms are not added to admin tree for their submission reviewing)

Proposed database table permissions that should be at least for this to work: 

GRANT SELECT ON `inportal_database`.`inp_Phrase` TO 'inportal_user'@'localhost'; 
GRANT SELECT ON `inportal_database`.`inp_ConfigurationValues` TO 'inportal_user'@'localhost'; 
GRANT SELECT ON `inportal_database`.`inp_Language` TO 'inportal_user'@'localhost'; 
GRANT SELECT ON `inportal_database`.`inp_Modules` TO 'inportal_user'@'localhost'; 
GRANT SELECT ON `inportal_database`.`inp_Theme` TO 'inportal_user'@'localhost'; 
GRANT SELECT ON `inportal_database`.`inp_Skins` TO 'inportal_user'@'localhost'; 
GRANT SELECT ON `inportal_database`.`inp_SiteDomains` TO 'inportal_user'@'localhost';  

As you can clearly see there is only 7 database table needed, instead of 71 tables, that could be used (I'm not saying that all of them are used on each run). 

What won't be working:

  • building links using "use_section" parameter of "m_Link" tag
  • new agents are not added based on found "RegularEvents" unit config option (already existing agents will work of course)
  • new records in Category table are not added based theme file scanning (so you should do "Rebuild Theme Files" while daemon mode is off)
  • importing language pack
  • new theme file discovery (for mod-rewrite url detection)

For all this to work you need to enable memcache caching.

daemon_mode_feature.patch

Related Tasks

INP-786 - Getting issue details... STATUS