mirror of
https://github.com/silverstripe/silverstripe-framework
synced 2024-08-26 12:36:07 +02:00
659 lines
21 KiB
PHP
659 lines
21 KiB
PHP
<?php
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use Symfony\Component\Yaml\Parser;
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/**
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* A utility class which builds a manifest of configuration items
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*
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* @package framework
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* @subpackage manifest
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*/
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class SS_ConfigManifest {
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/** @var string - The base path used when building the manifest */
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protected $base;
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/** @var string - A string to prepend to all cache keys to ensure all keys are unique to just this $base */
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protected $key;
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/** @var bool - Whether `test` directories should be searched when searching for configuration */
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protected $includeTests;
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/**
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* All the values needed to be collected to determine the correct combination of fragements for
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* the current environment.
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* @var array
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*/
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protected $variantKeySpec = false;
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/**
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* All the _config.php files. Need to be included every request & can't be cached. Not variant specific.
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* @var array
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*/
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protected $phpConfigSources = array();
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/**
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* All the _config/*.yml fragments pre-parsed and sorted in ascending include order. Not variant specific.
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* @var array
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*/
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protected $yamlConfigFragments = array();
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/**
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* The calculated config from _config/*.yml, sorted, filtered and merged. Variant specific.
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* @var array
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*/
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public $yamlConfig = array();
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/**
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* The variant key state as when yamlConfig was loaded
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* @var string
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*/
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protected $yamlConfigVariantKey = null;
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/**
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* @var [callback] A list of callbacks to be called whenever the content of yamlConfig changes
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*/
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protected $configChangeCallbacks = array();
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/**
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* A side-effect of collecting the _config fragments is the calculation of all module directories, since
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* the definition of a module is "a directory that contains either a _config.php file or a _config directory
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* @var array
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*/
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public $modules = array();
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/** Adds a path as a module */
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public function addModule($path) {
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$module = basename($path);
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if (isset($this->modules[$module]) && $this->modules[$module] != $path) {
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user_error("Module ".$module." in two places - ".$path." and ".$this->modules[$module]);
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}
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$this->modules[$module] = $path;
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}
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/** Returns true if the passed module exists */
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public function moduleExists($module) {
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return array_key_exists($module, $this->modules);
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}
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/**
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* Constructs and initialises a new configuration object, either loading
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* from the cache or re-scanning for classes.
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*
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* @param string $base The project base path.
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* @param bool $forceRegen Force the manifest to be regenerated.
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*/
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public function __construct($base, $includeTests = false, $forceRegen = false ) {
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$this->base = $base;
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$this->key = sha1($base).'_';
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$this->includeTests = $includeTests;
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// Get the Zend Cache to load/store cache into
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$this->cache = $this->getCache();
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// Unless we're forcing regen, try loading from cache
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if (!$forceRegen) {
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// The PHP config sources are always needed
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$this->phpConfigSources = $this->cache->load($this->key.'php_config_sources');
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// Get the variant key spec
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$this->variantKeySpec = $this->cache->load($this->key.'variant_key_spec');
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}
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// If we don't have a variantKeySpec (because we're forcing regen, or it just wasn't in the cache), generate it
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if (false === $this->variantKeySpec) {
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$this->regenerate($includeTests);
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}
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// At this point $this->variantKeySpec will always contain something valid, so we can build the variant
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$this->buildYamlConfigVariant();
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}
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/**
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* Provides a hook for mock unit tests despite no DI
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* @return Zend_Cache_Frontend
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*/
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protected function getCache()
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{
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return SS_Cache::factory('SS_Configuration', 'Core', array(
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'automatic_serialization' => true,
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'lifetime' => null
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));
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}
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/**
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* Register a callback to be called whenever the calculated merged config changes
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*
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* In some situations the merged config can change - for instance, code in _config.php can cause which Only
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* and Except fragments match. Registering a callback with this function allows code to be called when
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* this happens.
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*
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* @param callback $callback
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*/
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public function registerChangeCallback($callback) {
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$this->configChangeCallbacks[] = $callback;
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}
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/**
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* Includes all of the php _config.php files found by this manifest. Called by SS_Config when adding this manifest
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* @return void
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*/
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public function activateConfig() {
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foreach ($this->phpConfigSources as $config) {
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require_once $config;
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}
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if ($this->variantKey() != $this->yamlConfigVariantKey) $this->buildYamlConfigVariant();
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}
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/**
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* Gets the (merged) config value for the given class and config property name
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*
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* @param string $class - The class to get the config property value for
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* @param string $name - The config property to get the value for
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* @param any $default - What to return if no value was contained in any YAML file for the passed $class and $name
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* @return any - The merged set of all values contained in all the YAML configuration files for the passed
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* $class and $name, or $default if there are none
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*/
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public function get($class, $name, $default=null) {
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if (isset($this->yamlConfig[$class][$name])) return $this->yamlConfig[$class][$name];
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else return $default;
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}
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/**
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* Returns the string that uniquely identifies this variant. The variant is the combination of classes, modules,
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* environment, environment variables and constants that selects which yaml fragments actually make it into the
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* configuration because of "only"
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* and "except" rules.
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*
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* @return string
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*/
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public function variantKey() {
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$key = $this->variantKeySpec; // Copy to fill in actual values
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if (isset($key['environment'])) {
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$key['environment'] = Director::isDev() ? 'dev' : (Director::isTest() ? 'test' : 'live');
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}
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if (isset($key['envvars'])) foreach ($key['envvars'] as $variable => $foo) {
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$key['envvars'][$variable] = isset($_ENV[$variable]) ? $_ENV[$variable] : null;
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}
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if (isset($key['constants'])) foreach ($key['constants'] as $variable => $foo) {
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$key['constants'][$variable] = defined($variable) ? constant($variable) : null;
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}
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return sha1(serialize($key));
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}
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/**
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* Completely regenerates the manifest file. Scans through finding all php _config.php and yaml _config/*.ya?ml
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* files,parses the yaml files into fragments, sorts them and figures out what values need to be checked to pick
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* the correct variant.
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*
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* Does _not_ build the actual variant
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*
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* @param bool $cache Cache the result.
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*/
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public function regenerate($includeTests = false, $cache = true) {
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$this->phpConfigSources = array();
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$this->yamlConfigFragments = array();
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$this->variantKeySpec = array();
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$finder = new ManifestFileFinder();
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$finder->setOptions(array(
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'name_regex' => '/(^|[\/\\\\])_config.php$/',
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'ignore_tests' => !$includeTests,
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'file_callback' => array($this, 'addSourceConfigFile')
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));
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$finder->find($this->base);
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$finder = new ManifestFileFinder();
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$finder->setOptions(array(
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'name_regex' => '/\.ya?ml$/',
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'ignore_tests' => !$includeTests,
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'file_callback' => array($this, 'addYAMLConfigFile')
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));
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$finder->find($this->base);
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$this->prefilterYamlFragments();
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$this->sortYamlFragments();
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$this->buildVariantKeySpec();
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if ($cache) {
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$this->cache->save($this->phpConfigSources, $this->key.'php_config_sources');
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$this->cache->save($this->yamlConfigFragments, $this->key.'yaml_config_fragments');
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$this->cache->save($this->variantKeySpec, $this->key.'variant_key_spec');
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}
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}
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/**
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* Handle finding a php file. We just keep a record of all php files found, we don't include them
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* at this stage
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*
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* Public so that ManifestFileFinder can call it. Not for general use.
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*/
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public function addSourceConfigFile($basename, $pathname, $depth) {
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$this->phpConfigSources[] = $pathname;
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// Add this module too
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$this->addModule(dirname($pathname));
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}
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/**
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* Handle finding a yml file. Parse the file by spliting it into header/fragment pairs,
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* and normalising some of the header values (especially: give anonymous name if none assigned,
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* splt/complete before and after matchers)
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*
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* Public so that ManifestFileFinder can call it. Not for general use.
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*/
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public function addYAMLConfigFile($basename, $pathname, $depth) {
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if (!preg_match('{/([^/]+)/_config/}', $pathname, $match)) return;
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// Keep track of all the modules we've seen
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$this->addModule(dirname(dirname($pathname)));
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$parser = new Parser();
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// The base header
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$base = array(
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'module' => $match[1],
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'file' => basename(basename($basename, '.yml'), '.yaml')
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);
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// Make sure the linefeeds are all converted to \n, PCRE '$' will not match anything else.
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$fileContents = str_replace(array("\r\n", "\r"), "\n", file_get_contents($pathname));
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// YAML parsers really should handle this properly themselves, but neither spyc nor symfony-yaml do. So we
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// follow in their vein and just do what we need, not what the spec says
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$parts = preg_split('/^---$/m', $fileContents, -1, PREG_SPLIT_NO_EMPTY);
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// If only one document, it's a headerless fragment. So just add it with an anonymous name
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if (count($parts) == 1) {
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$this->yamlConfigFragments[] = $base + array(
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'name' => 'anonymous-1',
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'fragment' => $parser->parse($parts[0])
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);
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}
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// Otherwise it's a set of header/document pairs
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else {
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// If we got an odd number of parts the config file doesn't have a header for every document
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if (count($parts) % 2 != 0) {
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user_error("Configuration file '$pathname' does not have an equal number of headers and config blocks");
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}
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// Step through each pair
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for ($i = 0; $i < count($parts); $i+=2) {
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// Make all the first-level keys of the header lower case
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$header = array_change_key_case($parser->parse($parts[$i]), CASE_LOWER);
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// Assign a name if non assigned already
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if (!isset($header['name'])) $header['name'] = 'anonymous-'.(1+$i/2);
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// Parse & normalise the before and after if present
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foreach (array('before', 'after') as $order) {
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if (isset($header[$order])) {
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// First, splice into parts (multiple before or after parts are allowed, comma separated)
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if (is_array($header[$order])) $orderparts = $header[$order];
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else $orderparts = preg_split('/\s*,\s*/', $header[$order], -1, PREG_SPLIT_NO_EMPTY);
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// For each, parse out into module/file#name, and set any missing to "*"
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$header[$order] = array();
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foreach($orderparts as $part) {
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preg_match('! (?P<module>\*|[^\/#]+)? (\/ (?P<file>\*|\w+))? (\# (?P<fragment>\*|\w+))? !x',
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$part, $match);
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$header[$order][] = array(
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'module' => isset($match['module']) && $match['module'] ? $match['module'] : '*',
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'file' => isset($match['file']) && $match['file'] ? $match['file'] : '*',
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'name' => isset($match['fragment']) && $match['fragment'] ? $match['fragment'] : '*'
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);
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}
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}
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}
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// And add to the fragments list
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$this->yamlConfigFragments[] = $base + $header + array(
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'fragment' => $parser->parse($parts[$i+1])
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);
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}
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}
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}
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/**
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* Sorts the YAML fragments so that the "before" and "after" rules are met.
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* Throws an error if there's a loop
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*
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* We can't use regular sorts here - we need a topological sort. Easiest
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* way is with a DAG, so build up a DAG based on the before/after rules, then
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* sort that.
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*
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* @return void
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*/
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protected function sortYamlFragments() {
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$frags = $this->yamlConfigFragments;
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// Build a directed graph
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$dag = new SS_DAG($frags);
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foreach ($frags as $i => $frag) {
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foreach ($frags as $j => $otherfrag) {
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if ($i == $j) continue;
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$order = $this->relativeOrder($frag, $otherfrag);
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if ($order == 'before') $dag->addedge($i, $j);
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elseif ($order == 'after') $dag->addedge($j, $i);
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}
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}
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try {
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$this->yamlConfigFragments = $dag->sort();
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}
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catch (SS_DAG_CyclicException $e) {
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if (!Director::isLive() && isset($_REQUEST['debug'])) {
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$res = '<h1>Remaining config fragment graph</h1>';
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$res .= '<dl>';
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foreach ($e->dag as $node) {
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$res .= "<dt>{$node['from']['module']}/{$node['from']['file']}#{$node['from']['name']}"
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. " marked to come after</dt><dd><ul>";
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foreach ($node['to'] as $to) {
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$res .= "<li>{$to['module']}/{$to['file']}#{$to['name']}</li>";
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}
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$res .= "</ul></dd>";
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}
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$res .= '</dl>';
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echo $res;
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}
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user_error('Based on their before & after rules two fragments both need to be before/after each other',
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E_USER_ERROR);
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}
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}
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/**
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* Return a string "after", "before" or "undefined" depending on whether the YAML fragment array element passed
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* as $a should be positioned after, before, or either compared to the YAML fragment array element passed as $b
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*
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* @param $a Array - a YAML config fragment as loaded by addYAMLConfigFile
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* @param $b Array - a YAML config fragment as loaded by addYAMLConfigFile
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* @return string "after", "before" or "undefined"
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*/
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protected function relativeOrder($a, $b) {
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$matches = array();
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// Do the same thing for after and before
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foreach (array('before', 'after') as $rulename) {
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$matches[$rulename] = array();
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// Figure out for each rule, which part matches
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if (isset($a[$rulename])) foreach ($a[$rulename] as $rule) {
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$match = array();
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foreach(array('module', 'file', 'name') as $part) {
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// If part is *, we match _unless_ the opposite rule has a non-* matcher than also matches $b
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if ($rule[$part] == '*') {
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$match[$part] = 'wild';
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}
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else {
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$match[$part] = ($rule[$part] == $b[$part]);
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}
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}
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$matches[$rulename][] = $match;
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}
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}
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// Figure out the specificness of each match. 1 an actual match, 0 for a wildcard match, remove if no match
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$matchlevel = array('before' => -1, 'after' => -1);
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foreach (array('before', 'after') as $rulename) {
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foreach ($matches[$rulename] as $i => $rule) {
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$level = 0;
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foreach ($rule as $part => $partmatches) {
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if ($partmatches === false) continue 2;
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if ($partmatches === true) $level += 1;
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}
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if ($matchlevel[$rulename] === false || $level > $matchlevel[$rulename]) {
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$matchlevel[$rulename] = $level;
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}
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}
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}
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if ($matchlevel['before'] === -1 && $matchlevel['after'] === -1) {
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return 'undefined';
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}
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else if ($matchlevel['before'] === $matchlevel['after']) {
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user_error('Config fragment requires itself to be both before _and_ after another fragment', E_USER_ERROR);
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}
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else {
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return ($matchlevel['before'] > $matchlevel['after']) ? 'before' : 'after';
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}
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}
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/**
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* This function filters the loaded yaml fragments, removing any that can't ever have their "only" and "except"
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* rules match.
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*
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* Some tests in "only" and "except" rules need to be checked per request, but some are manifest based -
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* these are invariant over requests and only need checking on manifest rebuild. So we can prefilter these before
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* saving yamlConfigFragments to speed up the process of checking the per-request variant/
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*/
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public function prefilterYamlFragments() {
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$matchingFragments = array();
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foreach ($this->yamlConfigFragments as $i => $fragment) {
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$matches = true;
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if (isset($fragment['only'])) {
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$matches = $matches && ($this->matchesPrefilterVariantRules($fragment['only']) !== false);
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}
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if (isset($fragment['except'])) {
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$matches = $matches && ($this->matchesPrefilterVariantRules($fragment['except']) !== true);
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}
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if ($matches) $matchingFragments[] = $fragment;
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}
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$this->yamlConfigFragments = $matchingFragments;
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}
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/**
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* Returns false if the prefilterable parts of the rule aren't met, and true if they are
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*
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* @param $rules array - A hash of rules as allowed in the only or except portion of a config fragment header
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* @return bool - True if the rules are met, false if not. (Note that depending on whether we were passed an
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* only or an except rule,
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* which values means accept or reject a fragment
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*/
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public function matchesPrefilterVariantRules($rules) {
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$matches = "undefined"; // Needs to be truthy, but not true
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foreach ($rules as $k => $v) {
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switch (strtolower($k)) {
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case 'classexists':
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$matches = $matches && ClassInfo::exists($v);
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break;
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case 'moduleexists':
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$matches = $matches && $this->moduleExists($v);
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break;
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default:
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// NOP
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}
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if ($matches === false) return $matches;
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}
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return $matches;
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}
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/**
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* Builds the variant key spec - the list of values that need to be build to give a key that uniquely identifies
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* this variant.
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*/
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public function buildVariantKeySpec() {
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$this->variantKeySpec = array();
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foreach ($this->yamlConfigFragments as $fragment) {
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if (isset($fragment['only'])) $this->addVariantKeySpecRules($fragment['only']);
|
|
if (isset($fragment['except'])) $this->addVariantKeySpecRules($fragment['except']);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Adds any variables referenced in the passed rules to the $this->variantKeySpec array
|
|
*/
|
|
public function addVariantKeySpecRules($rules) {
|
|
foreach ($rules as $k => $v) {
|
|
switch (strtolower($k)) {
|
|
case 'classexists':
|
|
case 'moduleexists':
|
|
// Classes and modules are a special case - we can pre-filter on config regenerate because we
|
|
// already know if the class or module exists
|
|
break;
|
|
|
|
case 'environment':
|
|
$this->variantKeySpec['environment'] = true;
|
|
break;
|
|
|
|
case 'envvarset':
|
|
if (!isset($this->variantKeySpec['envvars'])) $this->variantKeySpec['envvars'] = array();
|
|
$this->variantKeySpec['envvars'][$k] = $k;
|
|
break;
|
|
|
|
case 'constantdefined':
|
|
if (!isset($this->variantKeySpec['constants'])) $this->variantKeySpec['constants'] = array();
|
|
$this->variantKeySpec['constants'][$k] = $k;
|
|
break;
|
|
|
|
default:
|
|
if (!isset($this->variantKeySpec['envvars'])) $this->variantKeySpec['envvars'] = array();
|
|
if (!isset($this->variantKeySpec['constants'])) $this->variantKeySpec['constants'] = array();
|
|
$this->variantKeySpec['envvars'][$k] = $this->variantKeySpec['constants'][$k] = $k;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Calculates which yaml config fragments are applicable in this variant, and merge those all together into
|
|
* the $this->yamlConfig propperty
|
|
*
|
|
* Checks cache and takes care of loading yamlConfigFragments if they aren't already present, but expects
|
|
* $variantKeySpec to already be set
|
|
*/
|
|
public function buildYamlConfigVariant($cache = true) {
|
|
// Only try loading from cache if we don't have the fragments already loaded, as there's no way to know if a
|
|
// given variant is stale compared to the complete set of fragments
|
|
if (!$this->yamlConfigFragments) {
|
|
// First try and just load the exact variant
|
|
if ($this->yamlConfig = $this->cache->load($this->key.'yaml_config_'.$this->variantKey())) {
|
|
$this->yamlConfigVariantKey = $this->variantKey();
|
|
return;
|
|
}
|
|
// Otherwise try and load the fragments so we can build the variant
|
|
else {
|
|
$this->yamlConfigFragments = $this->cache->load($this->key.'yaml_config_fragments');
|
|
}
|
|
}
|
|
|
|
// If we still don't have any fragments we have to build them
|
|
if (!$this->yamlConfigFragments) {
|
|
$this->regenerate($this->includeTests, $cache);
|
|
}
|
|
|
|
$this->yamlConfig = array();
|
|
$this->yamlConfigVariantKey = $this->variantKey();
|
|
|
|
foreach ($this->yamlConfigFragments as $i => $fragment) {
|
|
$matches = true;
|
|
|
|
if (isset($fragment['only'])) {
|
|
$matches = $matches && ($this->matchesVariantRules($fragment['only']) !== false);
|
|
}
|
|
|
|
if (isset($fragment['except'])) {
|
|
$matches = $matches && ($this->matchesVariantRules($fragment['except']) !== true);
|
|
}
|
|
|
|
if ($matches) $this->mergeInYamlFragment($this->yamlConfig, $fragment['fragment']);
|
|
}
|
|
|
|
if ($cache) {
|
|
$this->cache->save($this->yamlConfig, $this->key.'yaml_config_'.$this->variantKey());
|
|
}
|
|
|
|
// Since yamlConfig has changed, call any callbacks that are interested
|
|
foreach ($this->configChangeCallbacks as $callback) call_user_func($callback);
|
|
}
|
|
|
|
/**
|
|
* Returns false if the non-prefilterable parts of the rule aren't met, and true if they are
|
|
*/
|
|
public function matchesVariantRules($rules) {
|
|
$matches = "undefined"; // Needs to be truthy, but not true
|
|
|
|
foreach ($rules as $k => $v) {
|
|
switch (strtolower($k)) {
|
|
case 'classexists':
|
|
case 'moduleexists':
|
|
break;
|
|
|
|
case 'environment':
|
|
switch (strtolower($v)) {
|
|
case 'live':
|
|
$matches = $matches && Director::isLive();
|
|
break;
|
|
case 'test':
|
|
$matches = $matches && Director::isTest();
|
|
break;
|
|
case 'dev':
|
|
$matches = $matches && Director::isDev();
|
|
break;
|
|
default:
|
|
user_error('Unknown environment '.$v.' in config fragment', E_USER_ERROR);
|
|
}
|
|
break;
|
|
|
|
case 'envvarset':
|
|
$matches = $matches && isset($_ENV[$v]);
|
|
break;
|
|
|
|
case 'constantdefined':
|
|
$matches = $matches && defined($v);
|
|
break;
|
|
|
|
default:
|
|
$matches = $matches && (
|
|
(isset($_ENV[$k]) && $_ENV[$k] == $v) ||
|
|
(defined($k) && constant($k) == $v)
|
|
);
|
|
break;
|
|
}
|
|
|
|
if ($matches === false) return $matches;
|
|
}
|
|
|
|
return $matches;
|
|
}
|
|
|
|
/**
|
|
* Recursively merge a yaml fragment's configuration array into the primary merged configuration array.
|
|
* @param $into
|
|
* @param $fragment
|
|
* @return void
|
|
*/
|
|
public function mergeInYamlFragment(&$into, $fragment) {
|
|
foreach ($fragment as $k => $v) {
|
|
Config::merge_high_into_low($into[$k], $v);
|
|
}
|
|
}
|
|
|
|
}
|