/**
* Internal method to get capabilities of this adapter
*
* @return Capabilities
*/
protected function internalGetCapabilities()
{
if ($this->capabilities === null) {
$this->capabilityMarker = new stdClass();
$minTtl = $this->resourceManager->getMajorVersion($this->resourceId) < 2 ? 0 : 1;
//without serialization redis supports only strings for simple
//get/set methods
$this->capabilities = new Capabilities($this, $this->capabilityMarker, array('supportedDatatypes' => array('NULL' => 'string', 'boolean' => 'string', 'integer' => 'string', 'double' => 'string', 'string' => true, 'array' => false, 'object' => false, 'resource' => false), 'supportedMetadata' => array(), 'minTtl' => $minTtl, 'maxTtl' => 0, 'staticTtl' => true, 'ttlPrecision' => 1, 'useRequestTime' => false, 'expiredRead' => false, 'maxKeyLength' => 255, 'namespaceIsPrefix' => true));
}
return $this->capabilities;
}
/**
* {@inheritDoc}
*
* @throws Exception\ExceptionInterface
*/
protected function internalGetMetadata(&$normalizedKey)
{
$redis = $this->getRedisResource();
$metadata = [];
try {
$redisVersion = $this->resourceManager->getMajorVersion($this->resourceId);
// redis >= 2.8
// The command 'pttl' returns -2 if the item does not exist
// and -1 if the item has no associated expire
if (version_compare($redisVersion, '2.8', '>=')) {
$pttl = $redis->pttl($this->namespacePrefix . $normalizedKey);
if ($pttl <= -2) {
return false;
}
$metadata['ttl'] = $pttl == -1 ? null : $pttl / 1000;
// redis >= 2.6
// The command 'pttl' returns -1 if the item does not exist or the item as no associated expire
} elseif (version_compare($redisVersion, '2.6', '>=')) {
$pttl = $redis->pttl($this->namespacePrefix . $normalizedKey);
if ($pttl <= -1) {
if (!$this->internalHasItem($normalizedKey)) {
return false;
}
$metadata['ttl'] = null;
} else {
$metadata['ttl'] = $pttl / 1000;
}
// redis >= 2
// The command 'pttl' is not supported but 'ttl'
// The command 'ttl' returns 0 if the item does not exist same as if the item is going to be expired
// NOTE: In case of ttl=0 we return false because the item is going to be expired in a very near future
// and then doesn't exist any more
} elseif (version_compare($redisVersion, '2', '>=')) {
$ttl = $redis->ttl($this->namespacePrefix . $normalizedKey);
if ($ttl <= -1) {
if (!$this->internalHasItem($normalizedKey)) {
return false;
}
$metadata['ttl'] = null;
} else {
$metadata['ttl'] = $ttl;
}
// redis < 2
// The commands 'pttl' and 'ttl' are not supported
// but item existence have to be checked
} elseif (!$this->internalHasItem($normalizedKey)) {
return false;
}
} catch (RedisResourceException $e) {
throw new Exception\RuntimeException($redis->getLastError(), $e->getCode(), $e);
}
return $metadata;
}
