diff options
| -rw-r--r-- | lib/cache.php | 49 | ||||
| -rw-r--r-- | lib/default.php | 3 |
2 files changed, 51 insertions, 1 deletions
diff --git a/lib/cache.php b/lib/cache.php index ea0ff769d..dc667654a 100644 --- a/lib/cache.php +++ b/lib/cache.php @@ -87,6 +87,55 @@ class Cache } /** + * Create a cache key for data dependent on code + * + * For cache elements that are dependent on changes in code, this creates + * a more-or-less fingerprint of the current running code and adds it to + * the cache key. In the case of an upgrade of core, or addition or + * removal of plugins, a new unique fingerprint is generated and used. + * + * There can still be problems with a) differences in versions of the + * plugins and b) people running code between official versions. This is + * usually a problem only for experienced users like developers, who know + * how to clear their cache. + * + * For sites that run code between versions (like the status.net cloud), + * there's an additional build number configuration setting. + * + * @param string $extra the real part of the key + * + * @return string full key + */ + + static function codeKey($extra) + { + static $prefix = null; + + if (empty($prefix)) { + + $plugins = StatusNet::getActivePlugins(); + $names = array(); + + foreach ($plugins as $plugin) { + $names[] = $plugin[0]; + } + + $names = array_unique($names); + asort($names); + + // Unique enough. + + $uniq = crc32(implode(',', $names)); + + $build = common_config('site', 'build'); + + $prefix = STATUSNET_VERSION.':'.$build.':'.$uniq; + } + + return Cache::key($prefix.':'.$extra); + } + + /** * Make a string suitable for use as a key * * Useful for turning primary keys of tables into cache keys. diff --git a/lib/default.php b/lib/default.php index a19453fce..6c8b03927 100644 --- a/lib/default.php +++ b/lib/default.php @@ -59,7 +59,8 @@ $default = 'textlimit' => 140, 'indent' => true, 'use_x_sendfile' => false, - 'notice' => null // site wide notice text + 'notice' => null, // site wide notice text + 'build' => 1, // build number, for code-dependent cache ), 'db' => array('database' => 'YOU HAVE TO SET THIS IN config.php', |