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<?php |
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/** |
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* The cache object which reads and writes the GitHub api data |
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* @package WordPress_GitHub_Sync |
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*/ |
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/** |
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* Class WordPress_GitHub_Sync_Cache |
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*/ |
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class WordPress_GitHub_Sync_Cache { |
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/** |
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* Cached blobs. |
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* |
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* @var array |
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*/ |
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protected $blobs = array(); |
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/** |
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* Cached trees. |
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* |
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* @var array |
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*/ |
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protected $trees = array(); |
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/** |
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* Cached commits. |
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* |
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* @var array |
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*/ |
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protected $commits = array(); |
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/** |
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* Clean out previous version of API data. |
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* |
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* This old data failed to save frequently, as it was too much data to |
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* hold in a single MySQL row. While the idea of maintaining this data |
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* permanently in the database seemed ideal, given that the response for |
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* a given sha of a given type will never change, it was too much information. |
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* Transients are much more appropriate for this type of data, and even if we lose it, |
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* it can still be refetched from the GitHub API. |
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* |
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* The structure of this object, including the name `open` for the singleton |
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* method, is a holdover from this original implementation, where we would save |
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* to the the database on the WordPress's shutdown hook with a `close` method. |
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* All of this no longer exists, but we should be good WordPress citizens |
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* and delete the data we left behind, since it was large and we're no longer |
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* using it. |
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*/ |
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public function __construct() { |
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// Clear out previously saved information. |
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if ( get_option( '_wpghs_api_cache' ) ) { |
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delete_option( '_wpghs_api_cache' ); |
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} |
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} |
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/** |
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* Fetch commit from cache by sha. |
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* |
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* @param string $sha Commit sha to fetch from cache. |
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* |
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* @return false|WordPress_GitHub_Sync_Commit |
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*/ |
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public function fetch_commit( $sha ) { |
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$commit = $this->get( 'commits', $sha ); |
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if ( $commit instanceof WordPress_GitHub_Sync_Commit ) { |
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return $commit; |
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} |
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return false; |
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} |
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/** |
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* Save commit to cache by sha. |
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* |
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* @param string $sha Commit sha to cache by. |
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* @param WordPress_GitHub_Sync_Commit $commit Commit to cache. |
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* |
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* @return WordPress_GitHub_Sync_Commit |
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*/ |
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public function set_commit( $sha, WordPress_GitHub_Sync_Commit $commit ) { |
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return $this->save( 'commits', $sha, $commit, 0 ); |
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} |
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/** |
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* Fetch tree from cache by sha. |
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* |
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* @param string $sha Tree sha to fetch from cache. |
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* |
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* @return false|WordPress_GitHub_Sync_Tree |
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*/ |
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public function fetch_tree( $sha ) { |
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$tree = $this->get( 'trees', $sha ); |
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if ( $tree instanceof WordPress_GitHub_Sync_Tree ) { |
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return $tree; |
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} |
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return false; |
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} |
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/** |
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* Save tree to cache by sha. |
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* |
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* @param string $sha Tree sha to cache by. |
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* @param WordPress_GitHub_Sync_Tree $tree Tree to cache. |
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* |
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* @return WordPress_GitHub_Sync_Tree |
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*/ |
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public function set_tree( $sha, WordPress_GitHub_Sync_Tree $tree ) { |
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return $this->save( 'trees', $sha, $tree, DAY_IN_SECONDS * 3 ); |
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} |
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/** |
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* Fetch tree from cache by sha. |
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* |
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* @param string $sha Blob sha to fetch from cache. |
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* |
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* @return false|WordPress_GitHub_Sync_Blob |
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*/ |
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public function fetch_blob( $sha ) { |
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$blob = $this->get( 'blobs', $sha ); |
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if ( $blob instanceof WordPress_GitHub_Sync_Blob ) { |
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return $blob; |
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} |
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return false; |
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} |
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/** |
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* Save blob to cache by sha. |
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* |
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* @param string $sha Blob sha to cache by. |
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* @param WordPress_GitHub_Sync_Blob $blob Blob to cache. |
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* |
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* @return WordPress_GitHub_Sync_Blob |
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*/ |
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public function set_blob( $sha, WordPress_GitHub_Sync_Blob $blob ) { |
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return $this->save( 'blobs', $sha, $blob, 3 * DAY_IN_SECONDS ); |
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} |
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/** |
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* Retrieve data from previous api calls by sha. |
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* |
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* @param string $type Object type to retrieve from cache. |
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* @param string $sha Object sha to retrieve from cache. |
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* |
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* @return stdClass|false response object if cached, false if not |
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*/ |
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protected function get( $type, $sha ) { |
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if ( isset( $this->{$type}[ $sha ] ) ) { |
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return $this->{$type}[ $sha ]; |
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} |
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if ( $data = get_transient( $this->cache_id( $type, $sha ) ) ) { |
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return $this->{$type}[ $sha ] = $data; |
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} |
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return false; |
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} |
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/** |
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* Save data from api call by sha. |
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* |
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* @param string $type Object type. |
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* @param string $sha Object sha to cache by. |
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* @param object $data Object to cache. |
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* @param string $time Length of time to cache object for. |
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* |
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* @return mixed |
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*/ |
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protected function save( $type, $sha, $data, $time ) { |
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$this->{$type}[ $sha ] = $data; |
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set_transient( $this->cache_id( $type, $sha ), $data, $time ); |
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return $data; |
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} |
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/** |
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* Generates the cache id for a given type & sha. |
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* |
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* @param string $type Object type. |
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* @param string $sha Object sha. |
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* |
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* @return string |
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*/ |
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protected function cache_id( $type, $sha ) { |
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return 'wpghs_' . md5( $type . '_' . $sha ); |
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} |
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} |
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