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Preferences

Preferences are user based configuration for Icinga 2 Web. For example max page items, languages or date time settings can controlled by users.

Architecture

Preferences are initially loaded from a provider (ini files or database) and stored into session at login time. After this step preferences are only persisted to the configured backend, but never reloaded from them.

Configuration

Preferences can be configured in config.ini in preferences section, default settings are this:

[preferences]
type=ini

The ini provider uses the directory config/preferences to create one ini file per user and persists the data into a single file. If you want to drop your preferences just drop the file from disk and you'll start with a new profile.

Database Provider

To be more flexible in distributed setups you can store preferences in a database (pgsql or mysql), a typical configuration looks like the following example:

[preferences]
type=db
resource=icingaweb-pgsql

Null Provider

The Null Provider discards all preferences and is mainly used as a fallback when no provider could be created (due to permission errors, database outtakes, etc.).

[preferences]
type=null

If your preferences aren't stored it's best to take a look into the logfiles - errors during the preference setup are displayed as warnings here.

Settings

resource: A reference to a database declared in resources.ini. Please read the chapter about resources for a detailed description about how to set up resources.

Preparation

To use this feature you need a running database environment. After creating a database and a writable user you need to import the initial table file:

etc/schema/preferences.mysql.sql (for mysql database)
etc/schema/preferemces.pgsql.sql (for postgres databases)

Example for mysql

# mysql -u root -p
mysql> create database icingaweb;
mysql> GRANT SELECT,INSERT,UPDATE,DELETE ON icingaweb.* TO \
    'icingaweb'@'localhost' IDENTIFIED BY 'icingaweb';
mysql> exit
# mysql -u root -p icingaweb < /path/to/icingaweb/etc/schema/preferences.mysql.sql

After following these steps above you can configure your preferences provider.

Coding API

You can set, update or remove preferences using the Preference data object which is bound to the user. Here are some simple examples how to work with that:

$preferences = $user->getPreferences();
// Get language with en_US as fallback
$preferences->get('app.language', 'en_US');
$preferences->set('app.language', 'de_DE');
$preferences->remove('app.language');

// Using transactional mode
$preferences->startTransaction();
$preferences->set('test.pref1', 'pref1');
$preferences->set('test.pref2', 'pref2');
$preferences->remove('test.pref3');
$preferemces->commit(); // Stores 3 changes in one operation

More information can be found in the api docs.

Namespaces and behaviour

If you are using this API please obey the following rules:

Use dotted notation for preferences
Namespaces starting with one context identifier
- app as global identified (e.g. app.language)
- mymodule for your module
- monitoring for the monitoring module
Use preferences wisely (set only when needed and write small settings)
Use only simple data types, e.g. strings or numbers
- If you need complex types you have to do it your self (e.g. serialization)

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