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phorge/src/applications/cache/spec/PhabricatorDataCacheSpec.php
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PhabricatorDataCacheSpec.php
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<?php
final class PhabricatorDataCacheSpec extends PhabricatorCacheSpec {
private $cacheSummary;
public function setCacheSummary(array $cache_summary) {
$this->cacheSummary = $cache_summary;
return $this;
}
public function getCacheSummary() {
return $this->cacheSummary;
}
public static function getActiveCacheSpec() {
$spec = new PhabricatorDataCacheSpec();
// NOTE: If APCu is installed, it reports that APC is installed.
if (extension_loaded('apc') && !extension_loaded('apcu')) {
$spec->initAPCSpec();
} else if (extension_loaded('apcu')) {
$spec->initAPCuSpec();
} else {
$spec->initNoneSpec();
}
return $spec;
}
private function initAPCSpec() {
$this
->setName(pht('APC User Cache'))
->setVersion(phpversion('apc'));
if (ini_get('apc.enabled')) {
$this
->setIsEnabled(true)
->setClearCacheCallback('apc_clear_cache');
$this->initAPCCommonSpec();
} else {
$this->setIsEnabled(false);
$this->raiseEnableAPCIssue();
}
}
private function initAPCuSpec() {
$this
->setName(pht('APCu'))
->setVersion(phpversion('apcu'));
if (ini_get('apc.enabled')) {
if (function_exists('apcu_clear_cache')) {
$clear_callback = 'apcu_clear_cache';
} else {
$clear_callback = 'apc_clear_cache';
}
$this
->setIsEnabled(true)
->setClearCacheCallback($clear_callback);
$this->initAPCCommonSpec();
} else {
$this->setIsEnabled(false);
$this->raiseEnableAPCIssue();
}
}
private function initNoneSpec() {
if (version_compare(phpversion(), '5.5', '>=')) {
$message = pht(
'Installing the "APCu" PHP extension will improve performance. '.
'This extension is strongly recommended. Without it, this software '.
'must rely on a very inefficient disk-based cache.');
$this
->newIssue('extension.apcu')
->setShortName(pht('APCu'))
->setName(pht('PHP Extension "APCu" Not Installed'))
->setMessage($message)
->addPHPExtension('apcu');
} else {
$this->raiseInstallAPCIssue();
}
}
private function initAPCCommonSpec() {
$state = array();
if (function_exists('apcu_sma_info')) {
$mem = apcu_sma_info();
$info = apcu_cache_info();
} else if (function_exists('apc_sma_info')) {
$mem = apc_sma_info();
$info = apc_cache_info('user');
} else {
$mem = null;
}
if ($mem) {
$this->setTotalMemory($mem['num_seg'] * $mem['seg_size']);
$this->setUsedMemory($info['mem_size']);
$this->setEntryCount(count($info['cache_list']));
$cache = $info['cache_list'];
$state = array();
foreach ($cache as $item) {
// Some older versions of APCu report the cachekey as "key", while
// newer APCu and APC report it as "info". Just check both indexes
// for commpatibility. See T13164 for details.
$info = idx($item, 'info');
if ($info === null) {
$info = idx($item, 'key');
}
if ($info === null) {
$key = '<unknown-key>';
} else {
$key = self::getKeyPattern($info);
}
if (empty($state[$key])) {
$state[$key] = array(
'max' => 0,
'total' => 0,
'count' => 0,
);
}
$state[$key]['max'] = max($state[$key]['max'], $item['mem_size']);
$state[$key]['total'] += $item['mem_size'];
$state[$key]['count']++;
}
}
$this->setCacheSummary($state);
}
private static function getKeyPattern($key) {
// If this key isn't in the current cache namespace, don't reveal any
// information about it.
$namespace = PhabricatorEnv::getEnvConfig('phabricator.cache-namespace');
if (strncmp($key, $namespace.':', strlen($namespace) + 1)) {
return '<other-namespace>';
}
$key = preg_replace('/(?<![a-zA-Z])\d+(?![a-zA-Z])/', 'N', $key);
$key = preg_replace('/PHID-[A-Z]{4}-[a-z0-9]{20}/', 'PHID', $key);
// TODO: We should probably standardize how digests get embedded into cache
// keys to make this rule more generic.
$key = preg_replace('/:celerity:.*$/', ':celerity:X', $key);
$key = preg_replace('/:pkcs8:.*$/', ':pkcs8:X', $key);
return $key;
}
}

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