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https://github.com/silverstripe/silverstripe-framework
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Config system used to provide an add_static_source method, which was intended for use by Extensions to add statics. But extensions for a class arent initialised until at least one instance of that class is created, so before that the Config system didnt include values from extensions This patch reverses the control flow, so that the Config system explictly asks each Object for its additional config sources via the new method get_extra_config_sources. This method returns an array that can contain string names of classes and also raw associative arrays. The developer visible change is that Extension#add_to_class has been deprecated. Instead there is a new method, get_extra_config, which has the same method signature but needs to guarantee that it doesnt cause side effects. Additionally there is no need to call parent::get_extra_config - this is handled automatically.
500 lines
19 KiB
PHP
500 lines
19 KiB
PHP
<?php
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/**
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* The configuration system works like this:
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*
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* Each class has a set of named properties
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*
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* Each named property can contain either
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*
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* - An array
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* - A non-array value
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*
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* If the value is an array, each value in the array may also be one of those three types
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*
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* A property can have a value specified in multiple locations, each of which have a hardcoded or explicit priority.
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* We combine all these values together into a "composite" value using rules that depend on the priority order of the locations
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* to give the final value, using these rules:
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*
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* - If the value is an array, each array is added to the _beginning_ of the composite array in ascending priority order.
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* If a higher priority item has a non-integer key which is the same as a lower priority item, the value of those items
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* is merged using these same rules, and the result of the merge is located in the same location the higher priority item
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* would be if there was no key clash. Other than in this key-clash situation, within the particular array, order is preserved.
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*
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* - If the value is not an array, the highest priority value is used without any attempt to merge
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*
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* It is an error to have mixed types of the same named property in different locations (but an error will not necessarily
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* be raised due to optimisations in the lookup code)
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*
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* The exception to this is "false-ish" values - empty arrays, empty strings, etc. When merging a non-false-ish value with a
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* false-ish value, the result will be the non-false-ish value regardless of priority. When merging two false-sh values
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* the result will be the higher priority false-ish value.
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*
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* The locations that configuration values are taken from in highest -> lowest priority order
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*
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* - Any values set via a call to Config#update
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*
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* - The configuration values taken from the YAML files in _config directories (internally sorted in before / after order, where
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* the item that is latest is highest priority)
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*
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* - Any static set on an "additional static source" class (such as an extension) named the same as the name of the property
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*
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* - Any static set on the class named the same as the name of the property
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*
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* - The composite configuration value of the parent class of this class
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*
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* At some of these levels you can also set masks. These remove values from the composite value at their priority point rather than add.
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* They are much simpler. They consist of a list of key / value pairs. When applied against the current composite value
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*
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* - If the composite value is a sequential array, any member of that array that matches any value in the mask is removed
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*
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* - If the composite value is an associative array, any member of that array that matches both the key and value of any pair in the mask is removed
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*
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* - If the composite value is not an array, if that value matches any value in the mask it is removed
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*
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*
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*/
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class Config {
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/** @var Object - A marker instance for the "anything" singleton value. Don't access directly, even in-class, always use self::anything() */
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static private $_anything = null;
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/**
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* Get a marker class instance that is used to do a "remove anything with this key" by adding $key => Config::anything() to the suppress array
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* todo: Does this follow the SS coding conventions? Config::get_anything_marker_instance() is a lot less elegant.
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* @return Object
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*/
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static public function anything() {
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if (self::$_anything === null) self::$_anything = new stdClass();
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return self::$_anything;
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}
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// -- Source options bitmask --
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/** @const source options bitmask value - merge all parent configuration in as lowest priority */
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const INHERITED = 0;
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/** @const source options bitmask value - only get configuration set for this specific class, not any of it's parents */
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const UNINHERITED = 1;
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/** @const source options bitmask value - inherit, but stop on the first class that actually provides a value (event an empty value) */
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const FIRST_SET = 2;
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/** @const source options bitmask value - do not use additional statics sources (such as extension) */
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const EXCLUDE_EXTRA_SOURCES = 4;
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// -- get_value_type response enum --
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/** @const Return flag for get_value_type indicating value is a scalar (or really just not-an-array, at least ATM)*/
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const ISNT_ARRAY = 1;
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/** @const Return flag for get_value_type indicating value is an array */
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const IS_ARRAY = 2;
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/**
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* Get whether the value is an array or not. Used to be more complicated, but still nice sugar to have an enum to compare
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* and not just a true/false value
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* @param $val any - The value
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* @return int - One of ISNT_ARRAY or IS_ARRAY
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*/
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static protected function get_value_type($val) {
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if (is_array($val)) return self::IS_ARRAY;
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return self::ISNT_ARRAY;
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}
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/**
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* What to do if there's a type mismatch
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* @throws UnexpectedValueException
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*/
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static protected function type_mismatch() {
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throw new UnexpectedValueException('Type mismatch in configuration. All values for a particular property must contain the same type (or no value at all).');
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}
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/* @todo If we can, replace next static & static methods with DI once that's in */
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static protected $instance;
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/**
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* Get the current active Config instance.
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*
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* Configs should not normally be manually created.
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* In general use you will use this method to obtain the current Config instance.
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*
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* @return Config
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*/
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static public function inst() {
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if (!self::$instance) self::$instance = new Config();
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return self::$instance;
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}
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/**
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* Set the current active Config instance.
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*
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* Configs should not normally be manually created.
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* A use case for replacing the active configuration set would be for creating an isolated environment for
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* unit tests
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*
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* @return Config
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*/
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static public function set_instance($instance) {
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self::$instance = $instance;
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global $_SINGLETONS;
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$_SINGLETONS['Config'] = $instance;
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}
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/**
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* Empty construction, otherwise calling singleton('Config') (not the right way to get the current active config
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* instance, but people might) gives an error
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*/
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function __construct() {
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}
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/** @var [array] - Array of arrays. Each member is an nested array keyed as $class => $name => $value,
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* where value is a config value to treat as the highest priority item */
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protected $overrides = array();
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/** @var [array] - Array of arrays. Each member is an nested array keyed as $class => $name => $value,
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* where value is a config value suppress from any lower priority item */
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protected $suppresses = array();
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/** @var [array] - The list of settings pulled from config files to search through */
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protected $manifests = array();
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/**
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* Add another manifest to the list of config manifests to search through.
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*
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* WARNING: Config manifests to not merge entries, and do not solve before/after rules inter-manifest -
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* instead, the last manifest to be added always wins
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*/
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public function pushConfigManifest(SS_ConfigManifest $manifest) {
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array_unshift($this->manifests, $manifest->yamlConfig);
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// @todo: Do anything with these. They're for caching after config.php has executed
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$this->collectConfigPHPSettings = true;
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$this->configPHPIsSafe = false;
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$manifest->activateConfig();
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$this->collectConfigPHPSettings = false;
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}
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/** @var [Config_ForClass] - The list of Config_ForClass instances, keyed off class */
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static protected $for_class_instances = array();
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/**
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* Get an accessor that returns results by class by default.
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*
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* Shouldn't be overridden, since there might be many Config_ForClass instances already held in the wild. Each
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* Config_ForClass instance asks the current_instance of Config for the actual result, so override that instead
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*
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* @param $class
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* @return Config_ForClass
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*/
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public function forClass($class) {
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if (isset(self::$for_class_instances[$class])) {
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return self::$for_class_instances[$class];
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}
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else {
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return self::$for_class_instances[$class] = new Config_ForClass($class);
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}
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}
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/**
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* Merge a lower priority associative array into an existing higher priority associative array, as per the class
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* docblock rules
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*
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* It is assumed you've already checked that you've got two associative arrays, not scalars or sequential arrays
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*
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* @param $dest array - The existing high priority associative array
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* @param $src array - The low priority associative array to merge in
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*/
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static function merge_array_low_into_high(&$dest, $src) {
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foreach ($src as $k => $v) {
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if (!$v) {
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continue;
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}
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else if (is_int($k)) {
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$dest[] = $v;
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}
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else if (isset($dest[$k])) {
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$newType = self::get_value_type($v);
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$currentType = self::get_value_type($dest[$k]);
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// Throw error if types don't match
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if ($currentType !== $newType) self::type_mismatch();
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if ($currentType == self::IS_ARRAY) self::merge_array_low_into_high($dest[$k], $v);
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else continue;
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}
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else {
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$dest[$k] = $v;
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}
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}
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}
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/**
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* Merge a higher priority assocative array into an existing lower priority associative array, as per the class
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* docblock rules.
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*
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* Much more expensive that the other way around, as there's no way to insert an associative k/v pair into an
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* array at the top of the array
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*
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* @static
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* @param $dest array - The existing low priority associative array
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* @param $src array - The high priority array to merge in
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*/
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static function merge_array_high_into_low(&$dest, $src) {
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$res = $src;
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self::merge_array_low_into_high($res, $dest);
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$dest = $res;
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}
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static function merge_high_into_low(&$result, $value) {
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if (!$value) return;
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$newType = self::get_value_type($value);
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if (!$result) {
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$result = $value;
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}
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else {
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$currentType = self::get_value_type($result);
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if ($currentType !== $newType) self::type_mismatch();
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if ($currentType == self::ISNT_ARRAY) $result = $value;
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else self::merge_array_high_into_low($result, $value);
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}
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}
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static function merge_low_into_high(&$result, $value, $suppress) {
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$newType = self::get_value_type($value);
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if ($suppress) {
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if ($newType == self::IS_ARRAY) {
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$value = self::filter_array_by_suppress_array($value, $suppress);
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if (!$value) return;
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}
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else {
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if (self::check_value_contained_in_suppress_array($value, $suppress)) return;
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}
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}
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if (!$result) {
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$result = $value;
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}
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else {
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$currentType = self::get_value_type($result);
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if ($currentType !== $newType) self::type_mismatch();
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if ($currentType == self::ISNT_ARRAY) return; // PASS
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else self::merge_array_low_into_high($result, $value);
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}
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}
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static function check_value_contained_in_suppress_array($v, $suppresses) {
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foreach ($suppresses as $suppress) {
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list($sk, $sv) = $suppress;
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if ($sv === self::anything() || $v == $sv) return true;
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}
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return false;
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}
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static protected function check_key_or_value_contained_in_suppress_array($k, $v, $suppresses) {
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foreach ($suppresses as $suppress) {
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list($sk, $sv) = $suppress;
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if (($sk === self::anything() || $k == $sk) && ($sv === self::anything() || $v == $sv)) return true;
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}
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return false;
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}
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static protected function filter_array_by_suppress_array($array, $suppress) {
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$res = array();
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foreach ($array as $k => $v) {
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$suppressed = self::check_key_or_value_contained_in_suppress_array($k, $v, $suppress);
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if (!$suppressed) {
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if (is_numeric($k)) $res[] = $v;
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else $res[$k] = $v;
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}
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}
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return $res;
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}
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/**
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* Get the config value associated for a given class and property
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*
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* This merges all current sources and overrides together to give final value
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* todo: Currently this is done every time. This function is an inner loop function, so we really need to be caching heavily here.
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*
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* @param $class string - The name of the class to get the value for
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* @param $name string - The property to get the value for
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* @param int $sourceOptions - Bitmask which can be set to some combintain of Config::UNINHERITED, Config::FIRST_SET, and Config::EXCLUDE_EXTENSIONS.
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* Config::UNINHERITED does not include parent classes when merging configuration fragments
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* Config::FIRST_SET stops inheriting once the first class that sets a value (even an empty value) is encoutered
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* Config::EXCLUDE_EXTRA_SOURCES does not include any additional static sources (such as extensions)
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*
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* Config::INHERITED is a utility constant that can be used to mean "none of the above", equvilient to 0
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* Setting both Config::UNINHERITED and Config::FIRST_SET behaves the same as just Config::UNINHERITED
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*
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* should the parent classes value be merged in as the lowest priority source?
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* @param null $result array|scalar - Reference to a variable to put the result in. Also returned, so this can be left as null safely. If you do pass a value, it will be treated as the highest priority value in the result chain
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* @param null $suppress array - Internal use when called by child classes. Array of mask pairs to filter value by
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* @return array|scalar - The value of the config item, or null if no value set. Could be an associative array, sequential array or scalar depending on value (see class docblock)
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*/
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function get($class, $name, $sourceOptions = 0, &$result = null, $suppress = null) {
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// If result is already not something to merge into, just return it
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if ($result !== null && !is_array($result)) return $result;
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// First, look through the override values
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foreach($this->overrides as $k => $overrides) {
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if (isset($overrides[$class][$name])) {
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$value = $overrides[$class][$name];
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self::merge_low_into_high($result, $value, $suppress);
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if ($result !== null && !is_array($result)) return $result;
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}
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if (isset($this->suppresses[$k][$class][$name])) {
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$suppress = $suppress ? array_merge($suppress, $this->suppresses[$k][$class][$name]) : $this->suppresses[$k][$class][$name];
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}
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}
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// Then the manifest values
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foreach($this->manifests as $manifest) {
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if (isset($manifest[$class][$name])) {
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self::merge_low_into_high($result, $manifest[$class][$name], $suppress);
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if ($result !== null && !is_array($result)) return $result;
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}
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}
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// Then look at the static variables
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$nothing = new stdClass();
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$sources = array($class);
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// Include extensions only if not flagged not to, and some have been set
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if (($sourceOptions & self::EXCLUDE_EXTRA_SOURCES) != self::EXCLUDE_EXTRA_SOURCES) {
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$extraSources = Object::get_extra_config_sources($class);
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if ($extraSources) $sources = array_merge($sources, $extraSources);
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}
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foreach ($sources as $staticSource) {
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if (is_array($staticSource)) $value = isset($staticSource[$name]) ? $staticSource[$name] : $nothing;
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else $value = Object::static_lookup($staticSource, $name, $nothing);
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if ($value !== $nothing) {
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self::merge_low_into_high($result, $value, $suppress);
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if ($result !== null && !is_array($result)) return $result;
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}
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}
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// Finally, merge in the values from the parent class
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if (($sourceOptions & self::UNINHERITED) != self::UNINHERITED && (($sourceOptions & self::FIRST_SET) != self::FIRST_SET || $result === null)) {
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$parent = get_parent_class($class);
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if ($parent) $this->get($parent, $name, $sourceOptions, $result, $suppress);
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}
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if ($name == 'routes') {
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print_r($result); die;
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}
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return $result;
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}
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/**
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* Update a configuration value
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*
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* Configuration is modify only. The value passed is merged into the existing configuration. If you want to replace the
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* current value, you'll need to call remove first.
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*
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* @param $class string - The class to update a configuration value for
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* @param $name string - The configuration property name to update
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* @param $value any - The value to update with
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*
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* Arrays are recursively merged into current configuration as "latest" - for associative arrays the passed value
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* replaces any item with the same key, for sequential arrays the items are placed at the end of the array, for
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* non-array values, this value replaces any existing value
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*
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* You will get an error if you try and override array values with non-array values or vice-versa
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*/
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function update($class, $name, $val) {
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if (!isset($this->overrides[0][$class])) $this->overrides[0][$class] = array();
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if (!isset($this->overrides[0][$class][$name])) $this->overrides[0][$class][$name] = $val;
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else self::merge_high_into_low($this->overrides[0][$class][$name], $val);
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}
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/**
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* Remove a configuration value
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*
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* You can specify a key, a key and a value, or neither. Either argument can be Config::anything(), which is
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* what is defaulted to if you don't specify something
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*
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* This removes any current configuration value that matches the key and/or value specified
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*
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* Works like this:
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* - Check the current override array, and remove any values that match the arguments provided
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* - Keeps track of the arguments passed to this method, and in get filters everything _except_ the current override array to
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* exclude any match
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*
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* This way we can re-set anything removed by a call to this function by calling set. Because the current override
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* array is only filtered immediately on calling this remove method, that value will then be exposed. However, every
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* other source is filtered on request, so no amount of changes to parent's configuration etc can override a remove call.
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*
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* @param $class string - The class to remove a configuration value from
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* @param $name string - The configuration name
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* @param $key any - An optional key to filter against.
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* If referenced config value is an array, only members of that array that match this key will be removed
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* Must also match value if provided to be removed
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* @param $value any - And optional value to filter against.
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* If referenced config value is an array, only members of that array that match this value will be removed
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* If referenced config value is not an array, value will be removed only if it matches this argument
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* Must also match key if provided and referenced config value is an array to be removed
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*
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* Matching is always by "==", not by "==="
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*/
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function remove($class, $name) {
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$argc = func_num_args();
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$key = $argc > 2 ? func_get_arg(2) : self::anything();
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$value = $argc > 3 ? func_get_arg(3) : self::anything();
|
|
|
|
$suppress = array($key, $value);
|
|
|
|
if (isset($this->overrides[0][$class][$name])) {
|
|
$value = $this->overrides[0][$class][$name];
|
|
|
|
if (is_array($value)) {
|
|
$this->overrides[0][$class][$name] = self::filter_array_by_suppress_array($value, array($suppress));
|
|
}
|
|
else {
|
|
if (self::check_value_contained_in_suppress_array($value, array($suppress))) unset($this->overrides[0][$class][$name]);
|
|
}
|
|
}
|
|
|
|
if (!isset($this->suppresses[0][$class])) $this->suppresses[0][$class] = array();
|
|
if (!isset($this->suppresses[0][$class][$name])) $this->suppresses[0][$class][$name] = array();
|
|
|
|
$this->suppresses[0][$class][$name][] = $suppress;
|
|
}
|
|
|
|
}
|
|
|
|
class Config_ForClass {
|
|
protected $class;
|
|
|
|
function __construct($class) {
|
|
$this->class = $class;
|
|
}
|
|
|
|
function __get($name) {
|
|
return Config::inst()->get($this->class, $name);
|
|
}
|
|
|
|
function __set($name, $val) {
|
|
return Config::inst()->update($this->class, $name, $val);
|
|
}
|
|
|
|
function get($name, $sourceOptions = 0) {
|
|
return Config::inst()->get($this->class, $name, $sourceOptions);
|
|
}
|
|
|
|
function forClass($class) {
|
|
return Config::inst()->forClass($class);
|
|
}
|
|
}
|