9c3c0b704b
array_fill_keys() was introduced in PHP 5.2.0 and works like array_flip() except that it does only one thing (copying keys) instead of two things (copying keys and values). That makes it faster and more obvious. When array_flip() calls were paired, I left them as is, because that pattern is too cute. I couldn't kill something so cute. Sometimes it was hard to figure out whether the values in array_flip() result were used. That's the point of this change. If you use array_fill_keys(), the intention is obvious. Change-Id: If8d340a8bc816a15afec37e64f00106ae45e10ed
632 lines
20 KiB
PHP
632 lines
20 KiB
PHP
<?php
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/**
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* Configuration holder, particularly for multi-wiki sites.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @file
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*/
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use MediaWiki\Shell\Shell;
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/**
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* This is a class for holding configuration settings, particularly for
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* multi-wiki sites.
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*
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* A basic synopsis:
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*
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* Consider a wikifarm having three sites: two production sites, one in English
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* and one in German, and one testing site. You can assign them easy-to-remember
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* identifiers - ISO 639 codes 'en' and 'de' for language wikis, and 'beta' for
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* the testing wiki.
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*
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* You would thus initialize the site configuration by specifying the wiki
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* identifiers:
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*
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* @code
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* $conf = new SiteConfiguration;
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* $conf->wikis = [ 'de', 'en', 'beta' ];
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* @endcode
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*
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* When configuring the MediaWiki global settings (the $wg variables),
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* the identifiers will be available to specify settings on a per wiki basis.
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*
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* @code
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* $conf->settings = [
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* 'wgSomeSetting' => [
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*
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* # production:
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* 'de' => false,
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* 'en' => false,
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*
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* # test:
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* 'beta => true,
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* ],
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* ];
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* @endcode
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*
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* With three wikis, that is easy to manage. But what about a farm with
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* hundreds of wikis? Site configuration provides a special keyword named
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* 'default' which is the value used when a wiki is not found. Hence
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* the above code could be written:
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*
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* @code
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* $conf->settings = [
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* 'wgSomeSetting' => [
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*
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* 'default' => false,
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*
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* # Enable feature on test
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* 'beta' => true,
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* ],
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* ];
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* @endcode
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*
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*
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* Since settings can contain arrays, site configuration provides a way
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* to merge an array with the default. This is very useful to avoid
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* repeating settings again and again while still maintaining specific changes
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* on a per wiki basis.
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*
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* @code
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* $conf->settings = [
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* 'wgMergeSetting' = [
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* # Value that will be shared among all wikis:
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* 'default' => [ NS_USER => true ],
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*
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* # Leading '+' means merging the array of value with the defaults
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* '+beta' => [ NS_HELP => true ],
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* ],
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* ];
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*
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* # Get configuration for the German site:
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* $conf->get( 'wgMergeSetting', 'de' );
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* // --> [ NS_USER => true ];
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*
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* # Get configuration for the testing site:
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* $conf->get( 'wgMergeSetting', 'beta' );
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* // --> [ NS_USER => true, NS_HELP => true ];
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* @endcode
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*
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* Finally, to load all configuration settings, extract them in global context:
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*
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* @code
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* # Name / identifier of the wiki as set in $conf->wikis
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* $wikiID = 'beta';
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* $globals = $conf->getAll( $wikiID );
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* extract( $globals );
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* @endcode
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*
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* @note For WikiMap to function, the configuration must define string values for
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* $wgServer (or $wgCanonicalServer) and $wgArticlePath, even if these are the
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* same for all wikis or can be correctly determined by the logic in
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* Setup.php.
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*
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* @todo Give examples for suffixes:
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* $conf->suffixes = [ 'wiki' ];
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*/
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class SiteConfiguration {
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/**
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* Array of suffixes, for self::siteFromDB()
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*/
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public $suffixes = [];
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/**
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* Array of wikis, should be the same as $wgLocalDatabases
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*/
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public $wikis = [];
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/**
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* The whole array of settings
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*/
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public $settings = [];
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/**
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* Optional callback to load full configuration data.
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* @var string|array
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*/
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public $fullLoadCallback = null;
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/** Whether or not all data has been loaded */
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public $fullLoadDone = false;
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/**
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* A callback function that returns an array with the following keys (all
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* optional):
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* - suffix: site's suffix
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* - lang: site's lang
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* - tags: array of wiki tags
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* - params: array of parameters to be replaced
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* The function will receive the SiteConfiguration instance in the first
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* argument and the wiki in the second one.
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* if suffix and lang are passed they will be used for the return value of
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* self::siteFromDB() and self::$suffixes will be ignored
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*
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* @var string|array
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*/
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public $siteParamsCallback = null;
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/**
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* Configuration cache for getConfig()
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* @var array
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*/
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protected $cfgCache = [];
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/**
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* Retrieves a configuration setting for a given wiki.
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* @param string $settingName ID of the setting name to retrieve
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* @param string $wiki Wiki ID of the wiki in question.
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* @param string|null $suffix The suffix of the wiki in question.
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* @param array $params List of parameters. $.'key' is replaced by $value in all returned data.
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* @param array $wikiTags The tags assigned to the wiki.
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* @return mixed The value of the setting requested.
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*/
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public function get( $settingName, $wiki, $suffix = null, $params = [],
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$wikiTags = []
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) {
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$params = $this->mergeParams( $wiki, $suffix, $params, $wikiTags );
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$overrides = $this->settings[$settingName] ?? null;
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return $overrides ? $this->processSetting( $overrides, $wiki, $params ) : null;
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}
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/**
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* Retrieve the configuration setting for a given wiki, based on an overrides array.
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*
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* General order of precedence:
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*
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* 1. Wiki ID, an override specific to the given wiki.
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* 2. Tag, an override specific to a group of wikis (e.g. wiki family, or db
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* shard). It is unsupported for the same setting to be set for multiple
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* tags of which the wiki groups overlap. In that case, whichever is
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* iterated and matched first wins, where the tag iteration order
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* is NOT guaranteed.
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* 3. Default, the default value for all wikis in this wiki farm.
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*
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* If the "+" operator is used, with any of these, then the merges will follow the
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* following order (earlier entries have precedence on clashing sub keys):
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*
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* 1. "+wiki"
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* 2. "tag"
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* Only one may match here. And upon match, the merge cascade stops.
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* 3. "+tag"
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* These are only considered if there was no "tag" match.
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* Multiple matches are allowed here, although the array values from
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* multiple tags that contain the same wiki must not overlap, as it is
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* undocumented how key conflicts among them would be handled.
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* 4. "default"
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*
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* @param array $thisSetting An array of overrides for a given setting.
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* @param string $wiki Wiki ID of the wiki in question.
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* @param array $params Array of parameters.
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* @return mixed The value of the setting requested.
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*/
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private function processSetting( array $thisSetting, $wiki, array $params ) {
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$retval = null;
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if ( array_key_exists( $wiki, $thisSetting ) ) {
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// Found override by Wiki ID.
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$retval = $thisSetting[$wiki];
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} else {
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if ( array_key_exists( "+$wiki", $thisSetting ) && is_array( $thisSetting["+$wiki"] ) ) {
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// Found mergable override by Wiki ID.
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// We continue to look for more merge candidates.
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$retval = $thisSetting["+$wiki"];
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}
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$done = false;
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foreach ( $params['tags'] as $tag ) {
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if ( array_key_exists( $tag, $thisSetting ) ) {
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if ( is_array( $retval ) && is_array( $thisSetting[$tag] ) ) {
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// Found a mergable override by Tag, without "+" operator.
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// Merge it with any "+wiki" match from before, and stop the cascade.
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$retval = self::arrayMerge( $retval, $thisSetting[$tag] );
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} else {
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// Found a non-mergable override by Tag.
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// This could in theory replace a "+wiki" match, but it should never happen
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// that a setting uses both mergable array values and non-array values.
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$retval = $thisSetting[$tag];
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}
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$done = true;
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break;
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} elseif ( array_key_exists( "+$tag", $thisSetting ) && is_array( $thisSetting["+$tag"] ) ) {
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// Found a mergable override by Tag with "+" operator.
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// Merge it with any "+wiki" or "+tag" matches from before,
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// and keep looking for more merge candidates.
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if ( $retval === null ) {
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$retval = [];
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}
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$retval = self::arrayMerge( $retval, $thisSetting["+$tag"] );
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}
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}
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if ( !$done && array_key_exists( 'default', $thisSetting ) ) {
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if ( is_array( $retval ) && is_array( $thisSetting['default'] ) ) {
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// Found a mergable default
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// Merge it with any "+wiki" or "+tag" matches from before.
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$retval = self::arrayMerge( $retval, $thisSetting['default'] );
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} else {
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// Found a default
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// If any array-based values were built up via "+wiki" or "+tag" matches,
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// these are thrown away here. We don't support merging array values into
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// non-array values, and the fallback here is to use the default.
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$retval = $thisSetting['default'];
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}
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}
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}
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// Type-safe string replacemens, don't do replacements on non-strings.
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if ( is_string( $retval ) ) {
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$retval = strtr( $retval, $params['replacements'] );
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} elseif ( is_array( $retval ) ) {
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foreach ( $retval as $key => $val ) {
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if ( is_string( $val ) ) {
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$retval[$key] = strtr( $val, $params['replacements'] );
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}
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}
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}
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return $retval;
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}
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/**
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* Gets all settings for a wiki
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* @param string $wiki Wiki ID of the wiki in question.
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* @param string|null $suffix The suffix of the wiki in question.
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* @param array $params List of parameters. $.'key' is replaced by $value in all returned data.
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* @param array $wikiTags The tags assigned to the wiki.
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* @return array Array of settings requested.
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*/
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public function getAll( $wiki, $suffix = null, $params = [], $wikiTags = [] ) {
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$params = $this->mergeParams( $wiki, $suffix, $params, $wikiTags );
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$localSettings = [];
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foreach ( $this->settings as $varname => $overrides ) {
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$append = false;
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$var = $varname;
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if ( substr( $varname, 0, 1 ) == '+' ) {
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$append = true;
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$var = substr( $varname, 1 );
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}
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$value = $this->processSetting( $overrides, $wiki, $params );
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if ( $append && is_array( $value ) && is_array( $GLOBALS[$var] ) ) {
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$value = self::arrayMerge( $value, $GLOBALS[$var] );
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}
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if ( $value !== null ) {
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$localSettings[$var] = $value;
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}
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}
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return $localSettings;
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}
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/**
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* Retrieves a configuration setting for a given wiki, forced to a boolean.
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* @param string $setting ID of the setting name to retrieve
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* @param string $wiki Wiki ID of the wiki in question.
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* @param string|null $suffix The suffix of the wiki in question.
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* @param array $wikiTags The tags assigned to the wiki.
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* @return bool The value of the setting requested.
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*/
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public function getBool( $setting, $wiki, $suffix = null, $wikiTags = [] ) {
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return (bool)$this->get( $setting, $wiki, $suffix, [], $wikiTags );
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}
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/**
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* Retrieves an array of local databases
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*
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* @return array
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*/
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public function getLocalDatabases() {
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return $this->wikis;
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}
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/**
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* Retrieves the value of a given setting, and places it in a variable passed by reference.
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* @param string $setting ID of the setting name to retrieve
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* @param string $wiki Wiki ID of the wiki in question.
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* @param string $suffix The suffix of the wiki in question.
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* @param array &$var Reference The variable to insert the value into.
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* @param array $params List of parameters. $.'key' is replaced by $value in all returned data.
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* @param array $wikiTags The tags assigned to the wiki.
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*/
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public function extractVar( $setting, $wiki, $suffix, &$var,
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$params = [], $wikiTags = []
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) {
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$value = $this->get( $setting, $wiki, $suffix, $params, $wikiTags );
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if ( $value !== null ) {
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$var = $value;
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}
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}
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/**
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* Retrieves the value of a given setting, and places it in its corresponding global variable.
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* @param string $setting ID of the setting name to retrieve
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* @param string $wiki Wiki ID of the wiki in question.
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* @param string|null $suffix The suffix of the wiki in question.
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* @param array $params List of parameters. $.'key' is replaced by $value in all returned data.
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* @param array $wikiTags The tags assigned to the wiki.
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*/
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public function extractGlobal( $setting, $wiki, $suffix = null,
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$params = [], $wikiTags = []
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) {
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$params = $this->mergeParams( $wiki, $suffix, $params, $wikiTags );
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$this->extractGlobalSetting( $setting, $wiki, $params );
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}
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/**
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* @param string $setting
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* @param string $wiki
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* @param array $params
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*/
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public function extractGlobalSetting( $setting, $wiki, $params ) {
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$overrides = $this->settings[$setting] ?? null;
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$value = $overrides ? $this->processSetting( $overrides, $wiki, $params ) : null;
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if ( $value !== null ) {
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if ( substr( $setting, 0, 1 ) == '+' && is_array( $value ) ) {
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$setting = substr( $setting, 1 );
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if ( is_array( $GLOBALS[$setting] ) ) {
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$GLOBALS[$setting] = self::arrayMerge( $GLOBALS[$setting], $value );
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} else {
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$GLOBALS[$setting] = $value;
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}
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} else {
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$GLOBALS[$setting] = $value;
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}
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}
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}
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/**
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* Retrieves the values of all settings, and places them in their corresponding global variables.
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* @param string $wiki Wiki ID of the wiki in question.
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* @param string|null $suffix The suffix of the wiki in question.
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* @param array $params List of parameters. $.'key' is replaced by $value in all returned data.
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* @param array $wikiTags The tags assigned to the wiki.
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*/
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public function extractAllGlobals( $wiki, $suffix = null, $params = [],
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$wikiTags = []
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) {
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$params = $this->mergeParams( $wiki, $suffix, $params, $wikiTags );
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foreach ( $this->settings as $varName => $setting ) {
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$this->extractGlobalSetting( $varName, $wiki, $params );
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}
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}
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/**
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* Return specific settings for $wiki
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* See the documentation of self::$siteParamsCallback for more in-depth
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* documentation about this function
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*
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* @param string $wiki
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* @return array
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*/
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protected function getWikiParams( $wiki ) {
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static $default = [
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'suffix' => null,
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'lang' => null,
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'tags' => [],
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'params' => [],
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];
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if ( !is_callable( $this->siteParamsCallback ) ) {
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return $default;
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}
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$ret = ( $this->siteParamsCallback )( $this, $wiki );
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# Validate the returned value
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if ( !is_array( $ret ) ) {
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return $default;
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}
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foreach ( $default as $name => $def ) {
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if ( !isset( $ret[$name] ) || ( is_array( $def ) && !is_array( $ret[$name] ) ) ) {
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$ret[$name] = $def;
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}
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}
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return $ret;
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}
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/**
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* Merge params between the ones passed to the function and the ones given
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* by self::$siteParamsCallback for backward compatibility
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* Values returned by self::getWikiParams() have the priority.
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*
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* @param string $wiki Wiki ID of the wiki in question.
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* @param string $suffix The suffix of the wiki in question.
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* @param array $params List of parameters. $.'key' is replaced by $value in
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* all returned data.
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* @param array $wikiTags The tags assigned to the wiki.
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* @return array
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*/
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protected function mergeParams( $wiki, $suffix, array $params, array $wikiTags ) {
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$ret = $this->getWikiParams( $wiki );
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if ( $ret['suffix'] === null ) {
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$ret['suffix'] = $suffix;
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}
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// Make tags based on the db suffix (e.g. wiki family) automatically
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// available for use in wgConf. The user does not have to maintain
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// wiki tag lookups (e.g. dblists at WMF) for the wiki family.
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$wikiTags[] = $ret['suffix'];
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$ret['tags'] = array_unique( array_merge( $ret['tags'], $wikiTags ) );
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$ret['params'] += $params;
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// Make the $lang and $site parameters automatically available if they
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// were provided by `siteParamsCallback` via getWikiParams()
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if ( !isset( $ret['params']['lang'] ) && $ret['lang'] !== null ) {
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$ret['params']['lang'] = $ret['lang'];
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}
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if ( !isset( $ret['params']['site'] ) && $ret['suffix'] !== null ) {
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$ret['params']['site'] = $ret['suffix'];
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}
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// Precompute the replacements to allow re-use over hundreds of processSetting()
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// calls, as optimisation for getAll() and extractAllGlobals().
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$ret['replacements'] = [];
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foreach ( $ret['params'] as $key => $value ) {
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$ret['replacements'][ '$' . $key ] = $value;
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}
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return $ret;
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}
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/**
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|
* Work out the site and language name from a database name
|
|
* @param string $wiki Wiki ID
|
|
*
|
|
* @return array
|
|
*/
|
|
public function siteFromDB( $wiki ) {
|
|
// Allow override
|
|
$def = $this->getWikiParams( $wiki );
|
|
if ( $def['suffix'] !== null && $def['lang'] !== null ) {
|
|
return [ $def['suffix'], $def['lang'] ];
|
|
}
|
|
|
|
$site = null;
|
|
$lang = null;
|
|
foreach ( $this->suffixes as $altSite => $suffix ) {
|
|
if ( $suffix === '' ) {
|
|
$site = '';
|
|
$lang = $wiki;
|
|
break;
|
|
} elseif ( substr( $wiki, -strlen( $suffix ) ) == $suffix ) {
|
|
$site = is_numeric( $altSite ) ? $suffix : $altSite;
|
|
$lang = substr( $wiki, 0, strlen( $wiki ) - strlen( $suffix ) );
|
|
break;
|
|
}
|
|
}
|
|
$lang = str_replace( '_', '-', $lang );
|
|
|
|
return [ $site, $lang ];
|
|
}
|
|
|
|
/**
|
|
* Get the resolved (post-setup) configuration of a potentially foreign wiki.
|
|
* For foreign wikis, this is expensive, and only works if maintenance
|
|
* scripts are setup to handle the --wiki parameter such as in wiki farms.
|
|
*
|
|
* @param string $wiki
|
|
* @param array|string $settings A setting name or array of setting names
|
|
* @return mixed|mixed[] Array if $settings is an array, otherwise the value
|
|
* @throws MWException
|
|
* @since 1.21
|
|
*/
|
|
public function getConfig( $wiki, $settings ) {
|
|
global $IP;
|
|
|
|
$multi = is_array( $settings );
|
|
$settings = (array)$settings;
|
|
if ( WikiMap::isCurrentWikiId( $wiki ) ) { // $wiki is this wiki
|
|
$res = [];
|
|
foreach ( $settings as $name ) {
|
|
if ( !preg_match( '/^wg[A-Z]/', $name ) ) {
|
|
throw new MWException( "Variable '$name' does start with 'wg'." );
|
|
} elseif ( !isset( $GLOBALS[$name] ) ) {
|
|
throw new MWException( "Variable '$name' is not set." );
|
|
}
|
|
$res[$name] = $GLOBALS[$name];
|
|
}
|
|
} else { // $wiki is a foreign wiki
|
|
if ( isset( $this->cfgCache[$wiki] ) ) {
|
|
$res = array_intersect_key( $this->cfgCache[$wiki],
|
|
array_fill_keys( $settings, true ) );
|
|
if ( count( $res ) == count( $settings ) ) {
|
|
return $multi ? $res : current( $res ); // cache hit
|
|
}
|
|
} elseif ( !in_array( $wiki, $this->wikis ) ) {
|
|
throw new MWException( "No such wiki '$wiki'." );
|
|
} else {
|
|
$this->cfgCache[$wiki] = [];
|
|
}
|
|
$result = Shell::makeScriptCommand(
|
|
"$IP/maintenance/getConfiguration.php",
|
|
[
|
|
'--wiki', $wiki,
|
|
'--settings', implode( ' ', $settings ),
|
|
'--format', 'PHP',
|
|
]
|
|
)
|
|
// limit.sh breaks this call
|
|
->limits( [ 'memory' => 0, 'filesize' => 0 ] )
|
|
->execute();
|
|
|
|
$data = trim( $result->getStdout() );
|
|
if ( $result->getExitCode() || $data === '' ) {
|
|
throw new MWException( "Failed to run getConfiguration.php: {$result->getStdout()}" );
|
|
}
|
|
$res = unserialize( $data );
|
|
if ( !is_array( $res ) ) {
|
|
throw new MWException( "Failed to unserialize configuration array." );
|
|
}
|
|
$this->cfgCache[$wiki] += $res;
|
|
}
|
|
|
|
return $multi ? $res : current( $res );
|
|
}
|
|
|
|
/**
|
|
* Merge multiple arrays together.
|
|
* On encountering duplicate keys, merge the two, but ONLY if they're arrays.
|
|
* PHP's array_merge_recursive() merges ANY duplicate values into arrays,
|
|
* which is not fun
|
|
*
|
|
* @param array $array1
|
|
* @param array $array2
|
|
* @return array
|
|
*/
|
|
private static function arrayMerge( array $array1, array $array2 ) {
|
|
$out = $array1;
|
|
foreach ( $array2 as $key => $value ) {
|
|
if ( isset( $out[$key] ) ) {
|
|
if ( is_array( $out[$key] ) && is_array( $value ) ) {
|
|
// Merge the new array into the existing one
|
|
$out[$key] = self::arrayMerge( $out[$key], $value );
|
|
} elseif ( is_numeric( $key ) ) {
|
|
// A numerical key is taken, append the value at the end instead.
|
|
// It is important that we generally preserve numerical keys and only
|
|
// fallback to appending values if there are conflicts. This is needed
|
|
// by configuration variables that hold associative arrays with
|
|
// meaningul numerical keys, such as $wgNamespacesWithSubpages,
|
|
// $wgNamespaceProtection, $wgNamespacesToBeSearchedDefault, etc.
|
|
$out[] = $value;
|
|
} elseif ( $out[$key] === false ) {
|
|
// A non-numerical key is taken and holds a false value,
|
|
// allow it to be overridden always. This exists mainly for the purpose
|
|
// merging permissions arrays, such as $wgGroupPermissions.
|
|
$out[$key] = $value;
|
|
}
|
|
// Else: The key is already taken and we keep the current value
|
|
|
|
} else {
|
|
// Add a new key.
|
|
$out[$key] = $value;
|
|
}
|
|
}
|
|
|
|
return $out;
|
|
}
|
|
|
|
public function loadFullData() {
|
|
if ( $this->fullLoadCallback && !$this->fullLoadDone ) {
|
|
( $this->fullLoadCallback )( $this );
|
|
$this->fullLoadDone = true;
|
|
}
|
|
}
|
|
}
|