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<?php |
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namespace MatthiasMullie\Scrapbook\Adapters; |
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use MatthiasMullie\Scrapbook\Adapters\Collections\Redis as Collection; |
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use MatthiasMullie\Scrapbook\Exception\InvalidCollection; |
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use MatthiasMullie\Scrapbook\KeyValueStore; |
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/** |
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* Redis adapter. Basically just a wrapper over \Redis, but in an exchangeable |
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* (KeyValueStore) interface. |
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* |
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* @author Matthias Mullie <[email protected]> |
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* @copyright Copyright (c) 2014, Matthias Mullie. All rights reserved |
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* @license LICENSE MIT |
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*/ |
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class Redis implements KeyValueStore |
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{ |
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/** |
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* @var \Redis |
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*/ |
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protected $client; |
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/** |
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* @var string|null |
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*/ |
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protected $version; |
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public function __construct(\Redis $client) |
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{ |
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$this->client = $client; |
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// set a serializer if none is set already |
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if (\Redis::SERIALIZER_NONE == $this->client->getOption(\Redis::OPT_SERIALIZER)) { |
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$this->client->setOption(\Redis::OPT_SERIALIZER, \Redis::SERIALIZER_PHP); |
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} |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function get($key, &$token = null) |
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{ |
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$this->client->multi(); |
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$this->client->get($key); |
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$this->client->exists($key); |
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/** @var array $return */ |
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$return = $this->client->exec(); |
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if (false === $return) { |
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return false; |
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} |
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$value = $return[0]; |
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$exists = $return[1]; |
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// no value = quit early, don't generate a useless token |
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if (!$exists) { |
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$token = null; |
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return false; |
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} |
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// serializing to make sure we don't pass objects (by-reference) ;) |
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$token = serialize($value); |
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return $value; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getMulti(array $keys, array &$tokens = null) |
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{ |
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$tokens = array(); |
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if (empty($keys)) { |
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return array(); |
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} |
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$this->client->multi(); |
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$this->client->mget($keys); |
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foreach ($keys as $key) { |
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$this->client->exists($key); |
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} |
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/** @var array $return */ |
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$return = $this->client->exec(); |
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if (false === $return) { |
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return array(); |
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} |
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$values = array_shift($return); |
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$exists = $return; |
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if (false === $values) { |
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$values = array_fill_keys($keys, false); |
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} |
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$values = array_combine($keys, $values); |
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$exists = array_combine($keys, $exists); |
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$tokens = array(); |
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foreach ($values as $key => $value) { |
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// filter out non-existing values |
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if (!$exists[$key]) { |
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unset($values[$key]); |
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continue; |
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} |
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// serializing to make sure we don't pass objects (by-reference) ;) |
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$tokens[$key] = serialize($value); |
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} |
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return $values; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function set($key, $value, $expire = 0) |
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{ |
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$ttl = $this->ttl($expire); |
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/* |
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* Negative ttl behavior isn't properly documented & doesn't always |
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* appear to treat the value as non-existing. Let's play safe and just |
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* delete it right away! |
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*/ |
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if ($ttl < 0) { |
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$this->delete($key); |
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return true; |
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} |
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/* |
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* phpredis advises: "Calling setex() is preferred if you want a Time To |
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* Live". It seems that setex it what set will fall back to if you pass |
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* it a TTL anyway. |
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* Redis advises: "Note: Since the SET command options can replace |
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* SETNX, SETEX, PSETEX, it is possible that in future versions of Redis |
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* these three commands will be deprecated and finally removed." |
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* I'll just go with set() - it works and seems the desired path for the |
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* future. |
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* |
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* @see https://github.com/ukko/phpredis-phpdoc/blob/master/src/Redis.php#L190 |
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* @see https://github.com/phpredis/phpredis#set |
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* @see http://redis.io/commands/SET |
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*/ |
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return $this->client->set($key, $value, $ttl); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function setMulti(array $items, $expire = 0) |
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{ |
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if (empty($items)) { |
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return array(); |
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} |
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$ttl = $this->ttl($expire); |
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/* |
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* Negative ttl behavior isn't properly documented & doesn't always |
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* appear to treat the value as non-existing. Let's play safe and just |
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* delete it right away! |
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*/ |
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if ($ttl < 0) { |
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$this->deleteMulti(array_keys($items)); |
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return array_fill_keys(array_keys($items), true); |
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} |
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if (null === $ttl) { |
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$success = $this->client->mset($items); |
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return array_fill_keys(array_keys($items), $success); |
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} |
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$this->client->multi(); |
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$this->client->mset($items); |
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// Redis has no convenient multi-expire method |
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foreach ($items as $key => $value) { |
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$this->client->expire($key, $ttl); |
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} |
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/* @var bool[] $return */ |
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$result = (array) $this->client->exec(); |
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$return = array(); |
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$keys = array_keys($items); |
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$success = array_shift($result); |
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foreach ($result as $i => $value) { |
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$key = $keys[$i]; |
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$return[$key] = $success && $value; |
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} |
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return $return; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function delete($key) |
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{ |
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return (bool) $this->client->del($key); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function deleteMulti(array $keys) |
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{ |
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if (empty($keys)) { |
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return array(); |
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} |
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/* |
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* del will only return the amount of deleted entries, but we also want |
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* to know which failed. Deletes will only fail for items that don't |
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* exist, so we'll just ask for those and see which are missing. |
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*/ |
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$items = $this->getMulti($keys); |
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$this->client->del($keys); |
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$return = array(); |
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foreach ($keys as $key) { |
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$return[$key] = array_key_exists($key, $items); |
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} |
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return $return; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function add($key, $value, $expire = 0) |
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{ |
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$ttl = $this->ttl($expire); |
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/* |
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* Negative ttl behavior isn't properly documented & doesn't always |
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* appear to treat the value as non-existing. Let's play safe and not |
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* even create the value (also saving a request) |
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*/ |
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if ($ttl < 0) { |
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return true; |
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} |
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if (null === $ttl) { |
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return $this->client->setnx($key, $value); |
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} |
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/* |
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* I could use Redis 2.6.12-style options array: |
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* $this->client->set($key, $value, array('xx', 'ex' => $ttl)); |
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* However, this one should be pretty fast already, compared to the |
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* replace-workaround below. |
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*/ |
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$this->client->multi(); |
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$this->client->setnx($key, $value); |
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$this->client->expire($key, $ttl); |
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/** @var bool[] $return */ |
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$return = (array) $this->client->exec(); |
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return !in_array(false, $return); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function replace($key, $value, $expire = 0) |
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{ |
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$ttl = $this->ttl($expire); |
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/* |
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* Negative ttl behavior isn't properly documented & doesn't always |
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* appear to treat the value as non-existing. Let's play safe and just |
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* delete it right away! |
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*/ |
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if ($ttl < 0) { |
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return $this->delete($key); |
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} |
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/* |
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* Redis supports passing set() an extended options array since >=2.6.12 |
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* which allows for an easy and 1-request way to replace a value. |
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* That version already comes with Ubuntu 14.04. Ubuntu 12.04 (still |
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* widely used and in LTS) comes with an older version, however, so I |
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* want to support that too. |
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* Supporting both versions comes at a cost. |
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* I'll optimize for recent versions, which will get (in case of replace |
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* failure) 1 additional network request (for version info). Older |
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* versions will get 2 additional network requests: a failed replace |
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* (because the options are unknown) & a version check. |
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*/ |
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if (null === $this->version || $this->supportsOptionsArray()) { |
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$options = array('xx'); |
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if ($ttl > 0) { |
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/* |
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* Not adding 0 TTL to options: |
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* * HHVM (used to) interpret(s) wrongly & throw an exception |
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* * it's not needed anyway, for 0... |
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* @see https://github.com/facebook/hhvm/pull/4833 |
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*/ |
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$options['ex'] = $ttl; |
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} |
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// either we support options array or we haven't yet checked, in |
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// which case I'll assume a recent server is running |
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$result = $this->client->set($key, $value, $options); |
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if (false !== $result) { |
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return $result; |
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} |
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if ($this->supportsOptionsArray()) { |
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// failed execution, but not because our Redis version is too old |
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return false; |
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} |
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} |
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// workaround for old Redis versions |
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$this->client->watch($key); |
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$exists = $this->client->exists('key'); |
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if (!$exists) { |
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/* |
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* HHVM Redis only got unwatch recently |
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* @see https://github.com/asgrim/hhvm/commit/bf5a259cece5df8a7617133c85043608d1ad5316 |
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*/ |
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if (method_exists($this->client, 'unwatch')) { |
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$this->client->unwatch(); |
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} else { |
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// this should also kill the watch... |
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$this->client->multi()->discard(); |
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} |
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return false; |
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} |
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// since we're watching the key, this will fail should it change in the |
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// meantime |
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$this->client->multi(); |
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$this->client->set($key, $value, $ttl); |
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/** @var bool[] $return */ |
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$return = (array) $this->client->exec(); |
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return !in_array(false, $return); |
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} |
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/** |
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* {@inheritdoc} |
359
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*/ |
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public function cas($token, $key, $value, $expire = 0) |
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{ |
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$this->client->watch($key); |
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// check if the value still matches CAS token |
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$comparison = $this->client->get($key); |
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if (serialize($comparison) !== $token) { |
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/* |
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* HHVM Redis only got unwatch recently |
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* @see https://github.com/asgrim/hhvm/commit/bf5a259cece5df8a7617133c85043608d1ad5316 |
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*/ |
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if (method_exists($this->client, 'unwatch')) { |
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$this->client->unwatch(); |
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} else { |
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// this should also kill the watch... |
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$this->client->multi()->discard(); |
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} |
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return false; |
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} |
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|
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$ttl = $this->ttl($expire); |
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383
|
|
|
// since we're watching the key, this will fail should it change in the |
384
|
|
|
// meantime |
385
|
|
|
$this->client->multi(); |
386
|
|
|
|
387
|
|
|
/* |
388
|
|
|
* Negative ttl behavior isn't properly documented & doesn't always |
389
|
|
|
* appear to treat the value as non-existing. Let's play safe and just |
390
|
|
|
* delete it right away! |
391
|
|
|
*/ |
392
|
|
|
if ($ttl < 0) { |
393
|
|
|
$this->client->del($key); |
394
|
|
|
} else { |
395
|
|
|
$this->client->set($key, $value, $ttl); |
396
|
|
|
} |
397
|
|
|
|
398
|
|
|
/** @var bool[] $return */ |
399
|
|
|
$return = (array) $this->client->exec(); |
400
|
|
|
|
401
|
|
|
return !in_array(false, $return); |
402
|
|
|
} |
403
|
|
|
|
404
|
|
|
/** |
405
|
|
|
* {@inheritdoc} |
406
|
|
|
*/ |
407
|
|
|
public function increment($key, $offset = 1, $initial = 0, $expire = 0) |
408
|
|
|
{ |
409
|
|
|
if ($offset <= 0 || $initial < 0) { |
410
|
|
|
return false; |
411
|
|
|
} |
412
|
|
|
|
413
|
|
|
// INCRBY initializes (at 0) & immediately increments, whereas we |
414
|
|
|
// only do initialization if the value does not yet exist |
415
|
|
|
if (0 === $initial + $offset && 0 === $expire) { |
416
|
|
|
return $this->client->incrBy($key, $offset); |
417
|
|
|
} |
418
|
|
|
|
419
|
|
|
return $this->doIncrement($key, $offset, $initial, $expire); |
420
|
|
|
} |
421
|
|
|
|
422
|
|
|
/** |
423
|
|
|
* {@inheritdoc} |
424
|
|
|
*/ |
425
|
|
|
public function decrement($key, $offset = 1, $initial = 0, $expire = 0) |
426
|
|
|
{ |
427
|
|
|
if ($offset <= 0 || $initial < 0) { |
428
|
|
|
return false; |
429
|
|
|
} |
430
|
|
|
|
431
|
|
|
// DECRBY can't be used. Not even if we don't need an initial |
432
|
|
|
// value (it auto-initializes at 0) or expire. Problem is it |
433
|
|
|
// will decrement below 0, which is something we don't support. |
434
|
|
|
|
435
|
|
|
return $this->doIncrement($key, -$offset, $initial, $expire); |
436
|
|
|
} |
437
|
|
|
|
438
|
|
|
/** |
439
|
|
|
* {@inheritdoc} |
440
|
|
|
*/ |
441
|
|
|
public function touch($key, $expire) |
442
|
|
|
{ |
443
|
|
|
$ttl = $this->ttl($expire); |
444
|
|
|
|
445
|
|
|
if ($ttl < 0) { |
446
|
|
|
// Redis can't set expired, so just remove in that case ;) |
447
|
|
|
return (bool) $this->client->del($key); |
448
|
|
|
} |
449
|
|
|
|
450
|
|
|
return $this->client->expire($key, $ttl); |
451
|
|
|
} |
452
|
|
|
|
453
|
|
|
/** |
454
|
|
|
* {@inheritdoc} |
455
|
|
|
*/ |
456
|
|
|
public function flush() |
457
|
|
|
{ |
458
|
|
|
return $this->client->flushAll(); |
459
|
|
|
} |
460
|
|
|
|
461
|
|
|
/** |
462
|
|
|
* {@inheritdoc} |
463
|
|
|
*/ |
464
|
|
|
public function getCollection($name) |
465
|
|
|
{ |
466
|
|
|
if (!is_numeric($name)) { |
467
|
|
|
throw new InvalidCollection('Redis database names must be numeric. '.serialize($name).' given.'); |
468
|
|
|
} |
469
|
|
|
|
470
|
|
|
// we can't reuse $this->client in a different object, because it'll |
471
|
|
|
// operate on a different database |
472
|
|
|
$client = new \Redis(); |
473
|
|
|
|
474
|
|
|
if (null !== $this->client->getPersistentID()) { |
475
|
|
|
$client->pconnect( |
476
|
|
|
$this->client->getHost(), |
477
|
|
|
$this->client->getPort(), |
478
|
|
|
$this->client->getTimeout() |
479
|
|
|
); |
480
|
|
|
} else { |
481
|
|
|
$client->connect( |
482
|
|
|
$this->client->getHost(), |
483
|
|
|
$this->client->getPort(), |
484
|
|
|
$this->client->getTimeout() |
485
|
|
|
); |
486
|
|
|
} |
487
|
|
|
|
488
|
|
|
$auth = $this->client->getAuth(); |
489
|
|
|
if (null !== $auth) { |
490
|
|
|
$client->auth($auth); |
|
|
|
|
491
|
|
|
} |
492
|
|
|
|
493
|
|
|
$readTimeout = $this->client->getReadTimeout(); |
494
|
|
|
if ($readTimeout) { |
495
|
|
|
$client->setOption(\Redis::OPT_READ_TIMEOUT, $this->client->getReadTimeout()); |
496
|
|
|
} |
497
|
|
|
|
498
|
|
|
return new Collection($client, $name); |
499
|
|
|
} |
500
|
|
|
|
501
|
|
|
/** |
502
|
|
|
* Redis expects true TTL, not expiration timestamp. |
503
|
|
|
* |
504
|
|
|
* @param int $expire |
505
|
|
|
* |
506
|
|
|
* @return int|null TTL in seconds, or `null` for no expiration |
507
|
|
|
*/ |
508
|
|
|
protected function ttl($expire) |
509
|
|
|
{ |
510
|
|
|
if (0 === $expire) { |
511
|
|
|
return null; |
512
|
|
|
} |
513
|
|
|
|
514
|
|
|
// relative time in seconds, <30 days |
515
|
|
|
if ($expire > 30 * 24 * 60 * 60) { |
516
|
|
|
return $expire - time(); |
517
|
|
|
} |
518
|
|
|
|
519
|
|
|
return $expire; |
520
|
|
|
} |
521
|
|
|
|
522
|
|
|
/** |
523
|
|
|
* Shared between increment/decrement: both have mostly the same logic |
524
|
|
|
* (decrement just increments a negative value), but need their validation |
525
|
|
|
* & use of non-ttl native methods split up. |
526
|
|
|
* |
527
|
|
|
* @param string $key |
528
|
|
|
* @param int $offset |
529
|
|
|
* @param int $initial |
530
|
|
|
* @param int $expire |
531
|
|
|
* |
532
|
|
|
* @return int|bool |
533
|
|
|
*/ |
534
|
|
|
protected function doIncrement($key, $offset, $initial, $expire) |
535
|
|
|
{ |
536
|
|
|
$ttl = $this->ttl($expire); |
537
|
|
|
|
538
|
|
|
$this->client->watch($key); |
539
|
|
|
|
540
|
|
|
$value = $this->client->get($key); |
541
|
|
|
|
542
|
|
|
if (false === $value) { |
543
|
|
|
/* |
544
|
|
|
* Negative ttl behavior isn't properly documented & doesn't always |
545
|
|
|
* appear to treat the value as non-existing. Let's play safe and not |
546
|
|
|
* even create the value (also saving a request) |
547
|
|
|
*/ |
548
|
|
|
if ($ttl < 0) { |
549
|
|
|
return true; |
550
|
|
|
} |
551
|
|
|
|
552
|
|
|
// value is not yet set, store initial value! |
553
|
|
|
$this->client->multi(); |
554
|
|
|
$this->client->set($key, $initial, $ttl); |
555
|
|
|
|
556
|
|
|
/** @var bool[] $return */ |
557
|
|
|
$return = (array) $this->client->exec(); |
558
|
|
|
|
559
|
|
|
return !in_array(false, $return) ? $initial : false; |
560
|
|
|
} |
561
|
|
|
|
562
|
|
|
// can't increment if a non-numeric value is set |
563
|
|
|
if (!is_numeric($value) || $value < 0) { |
564
|
|
|
/* |
565
|
|
|
* HHVM Redis only got unwatch recently. |
566
|
|
|
* @see https://github.com/asgrim/hhvm/commit/bf5a259cece5df8a7617133c85043608d1ad5316 |
567
|
|
|
*/ |
568
|
|
|
if (method_exists($this->client, 'unwatch')) { |
569
|
|
|
$this->client->unwatch(); |
570
|
|
|
} else { |
571
|
|
|
// this should also kill the watch... |
572
|
|
|
$this->client->multi()->discard(); |
573
|
|
|
} |
574
|
|
|
|
575
|
|
|
return false; |
576
|
|
|
} |
577
|
|
|
|
578
|
|
|
$value += $offset; |
579
|
|
|
// value can never be lower than 0 |
580
|
|
|
$value = max(0, $value); |
581
|
|
|
|
582
|
|
|
$this->client->multi(); |
583
|
|
|
|
584
|
|
|
/* |
585
|
|
|
* Negative ttl behavior isn't properly documented & doesn't always |
586
|
|
|
* appear to treat the value as non-existing. Let's play safe and just |
587
|
|
|
* delete it right away! |
588
|
|
|
*/ |
589
|
|
|
if ($ttl < 0) { |
590
|
|
|
$this->client->del($key); |
591
|
|
|
} else { |
592
|
|
|
$this->client->set($key, $value, $ttl); |
593
|
|
|
} |
594
|
|
|
|
595
|
|
|
/** @var bool[] $return */ |
596
|
|
|
$return = (array) $this->client->exec(); |
597
|
|
|
|
598
|
|
|
return !in_array(false, $return) ? $value : false; |
599
|
|
|
} |
600
|
|
|
|
601
|
|
|
/** |
602
|
|
|
* Returns the version of the Redis server we're connecting to. |
603
|
|
|
* |
604
|
|
|
* @return string |
605
|
|
|
*/ |
606
|
|
|
protected function getVersion() |
607
|
|
|
{ |
608
|
|
|
if (null === $this->version) { |
609
|
|
|
$info = $this->client->info(); |
610
|
|
|
$this->version = $info['redis_version']; |
611
|
|
|
} |
612
|
|
|
|
613
|
|
|
return $this->version; |
614
|
|
|
} |
615
|
|
|
|
616
|
|
|
/** |
617
|
|
|
* Version-based check to test if passing an options array to set() is |
618
|
|
|
* supported. |
619
|
|
|
* |
620
|
|
|
* @return bool |
621
|
|
|
*/ |
622
|
|
|
protected function supportsOptionsArray() |
623
|
|
|
{ |
624
|
|
|
return version_compare($this->getVersion(), '2.6.12') >= 0; |
625
|
|
|
} |
626
|
|
|
} |
627
|
|
|
|