friendica/src/Core/Config.php

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<?php
/**
* System Configuration Class
*
* @file include/Core/Config.php
*
* @brief Contains the class with methods for system configuration
*/
namespace Friendica\Core;
use Friendica\Database\DBM;
use dba;
/**
* @brief Arbitrary sytem configuration storage
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*
* Note:
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* If we ever would decide to return exactly the variable type as entered,
* we will have fun with the additional features. :-)
*
* The config class always returns strings but in the default features
* we use a "false" to determine if the config value isn't set.
*
*/
class Config
{
private static $cache;
private static $in_db;
/**
* @brief Loads all configuration values of family into a cached storage.
*
* All configuration values of the system are stored in global cache
* which is available under the global variable $a->config
*
* @param string $family The category of the configuration value
*
* @return void
*/
public static function load($family = "config")
{
// We don't preload "system" anymore.
// This reduces the number of database reads a lot.
if ($family === 'system') {
return;
}
$a = get_app();
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$r = dba::select('config', array('v', 'k'), array('cat' => $family));
while ($rr = dba::fetch($r)) {
$k = $rr['k'];
if ($family === 'config') {
$a->config[$k] = $rr['v'];
} else {
$a->config[$family][$k] = $rr['v'];
self::$cache[$family][$k] = $rr['v'];
self::$in_db[$family][$k] = true;
}
}
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dba::close($r);
}
/**
* @brief Get a particular user's config variable given the category name
* ($family) and a key.
*
* Get a particular config value from the given category ($family)
* and the $key from a cached storage in $a->config[$uid].
* $instore is only used by the set_config function
* to determine if the key already exists in the DB
* If a key is found in the DB but doesn't exist in
* local config cache, pull it into the cache so we don't have
* to hit the DB again for this item.
*
* @param string $family The category of the configuration value
* @param string $key The configuration key to query
* @param mixed $default_value optional, The value to return if key is not set (default: null)
* @param boolean $refresh optional, If true the config is loaded from the db and not from the cache (default: false)
*
* @return mixed Stored value or null if it does not exist
*/
public static function get($family, $key, $default_value = null, $refresh = false)
{
$a = get_app();
if (!$refresh) {
// Do we have the cached value? Then return it
if (isset(self::$cache[$family][$key])) {
if (self::$cache[$family][$key] === '!<unset>!') {
return $default_value;
} else {
return self::$cache[$family][$key];
}
}
}
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$ret = dba::select('config', array('v'), array('cat' => $family, 'k' => $key), array('limit' => 1));
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if (DBM::is_result($ret)) {
// manage array value
$val = (preg_match("|^a:[0-9]+:{.*}$|s", $ret['v']) ? unserialize($ret['v']) : $ret['v']);
// Assign the value from the database to the cache
self::$cache[$family][$key] = $val;
self::$in_db[$family][$key] = true;
return $val;
} elseif (isset($a->config[$family][$key])) {
// Assign the value (mostly) from the .htconfig.php to the cache
self::$cache[$family][$key] = $a->config[$family][$key];
self::$in_db[$family][$key] = false;
return $a->config[$family][$key];
}
self::$cache[$family][$key] = '!<unset>!';
self::$in_db[$family][$key] = false;
return $default_value;
}
/**
* @brief Sets a configuration value for system config
*
* Stores a config value ($value) in the category ($family) under the key ($key)
* for the user_id $uid.
*
* Note: Please do not store booleans - convert to 0/1 integer values!
*
* @param string $family The category of the configuration value
* @param string $key The configuration key to set
* @param string $value The value to store
*
* @return mixed Stored $value or false if the database update failed
*/
public static function set($family, $key, $value)
{
$a = get_app();
// We store our setting values in a string variable.
// So we have to do the conversion here so that the compare below works.
// The exception are array values.
$dbvalue = (!is_array($value) ? (string)$value : $value);
$stored = self::get($family, $key, null, true);
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if (($stored === $dbvalue) && self::$in_db[$family][$key]) {
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return true;
}
if ($family === 'config') {
$a->config[$key] = $dbvalue;
} elseif ($family != 'system') {
$a->config[$family][$key] = $dbvalue;
}
// Assign the just added value to the cache
self::$cache[$family][$key] = $dbvalue;
// manage array value
$dbvalue = (is_array($value) ? serialize($value) : $dbvalue);
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dba::update('config', array('v' => $dbvalue), array('cat' => $family, 'k' => $key), true);
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if ($ret) {
self::$in_db[$family][$key] = true;
return $value;
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}
return $ret;
}
/**
* @brief Deletes the given key from the system configuration.
*
* Removes the configured value from the stored cache in $a->config
* and removes it from the database.
*
* @param string $family The category of the configuration value
* @param string $key The configuration key to delete
*
* @return mixed
*/
public static function delete($family, $key)
{
if (isset(self::$cache[$family][$key])) {
unset(self::$cache[$family][$key]);
unset(self::$in_db[$family][$key]);
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}
$ret = dba::delete('config', array('cat' => $family, 'k' => $key));
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return $ret;
}
}