RedisCache.php 7.3 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41
<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace yii\caching;

use yii\db\redis\Connection;

/**
 * RedisCache implements a cache application component based on [redis](http://redis.io/).
 *
 * RedisCache needs to be configured with [[hostname]], [[port]] and [[database]] of the server
 * to connect to. By default RedisCache assumes there is a redis server running on localhost at
 * port 6379 and uses the database number 0.
 *
 * RedisCache also supports [the AUTH command](http://redis.io/commands/auth) of redis.
 * When the server needs authentication, you can set the [[password]] property to
 * authenticate with the server after connect.
 *
 * See [[Cache]] manual for common cache operations that RedisCache supports.
 * Unlike the [[CCache]], RedisCache allows the expire parameter of
 * [[set]] and [[add]] to be a floating point number, so you may specify the time in milliseconds.
 *
 * To use RedisCache as the cache application component, configure the application as follows,
 *
 * ~~~
 * array(
 *     'components'=>array(
 *         'cache'=>array(
 *             'class'=>'RedisCache',
 *             'hostname'=>'localhost',
 *             'port'=>6379,
 *             'database'=>0,
 *         ),
 *     ),
 * )
 * ~~~
 *
42 43
 * @property \yii\db\redis\Connection $connection This property is read-only.
 *
44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107
 * @author Carsten Brandt <mail@cebe.cc>
 * @since 2.0
 */
class RedisCache extends Cache
{
	/**
	 * @var string hostname to use for connecting to the redis server. Defaults to 'localhost'.
	 */
	public $hostname = 'localhost';
	/**
	 * @var int the port to use for connecting to the redis server. Default port is 6379.
	 */
	public $port = 6379;
	/**
	 * @var string the password to use to authenticate with the redis server. If not set, no AUTH command will be sent.
	 */
	public $password;
	/**
	 * @var int the redis database to use. This is an integer value starting from 0. Defaults to 0.
	 */
	public $database = 0;
	/**
	 * @var float timeout to use for connection to redis. If not set the timeout set in php.ini will be used: ini_get("default_socket_timeout")
	 */
	public $connectionTimeout = null;
	/**
	 * @var float timeout to use for redis socket when reading and writing data. If not set the php default value will be used.
	 */
	public $dataTimeout = null;
	/**
	 * @var \yii\db\redis\Connection the redis connection
	 */
	private $_connection;


	/**
	 * Initializes the cache component by establishing a connection to the redis server.
	 */
	public function init()
	{
		parent::init();
		$this->getConnection();
	}

	/**
	 * Returns the redis connection object.
	 * Establishes a connection to the redis server if it does not already exists.
	 *
	 * TODO throw exception on error
	 * @return \yii\db\redis\Connection
	 */
	public function getConnection()
	{
		if ($this->_connection === null) {
			$this->_connection = new Connection(array(
				'dsn' => 'redis://' . $this->hostname . ':' . $this->port . '/' . $this->database,
				'password' => $this->password,
				'connectionTimeout' => $this->connectionTimeout,
				'dataTimeout' => $this->dataTimeout,
			));
		}
		return $this->_connection;
	}

108 109 110 111 112 113 114 115 116 117 118 119 120 121 122
	/**
	 * Checks whether a specified key exists in the cache.
	 * This can be faster than getting the value from the cache if the data is big.
	 * Note that this method does not check whether the dependency associated
	 * with the cached data, if there is any, has changed. So a call to [[get]]
	 * may return false while exists returns true.
	 * @param mixed $key a key identifying the cached value. This can be a simple string or
	 * a complex data structure consisting of factors representing the key.
	 * @return boolean true if a value exists in cache, false if the value is not in the cache or expired.
	 */
	public function exists($key)
	{
		return (bool) $this->_connection->executeCommand('EXISTS', array($this->buildKey($key)));
	}

123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215
	/**
	 * Retrieves a value from cache with a specified key.
	 * This is the implementation of the method declared in the parent class.
	 * @param string $key a unique key identifying the cached value
	 * @return string|boolean the value stored in cache, false if the value is not in the cache or expired.
	 */
	protected function getValue($key)
	{
		return $this->_connection->executeCommand('GET', array($key));
	}

	/**
	 * Retrieves multiple values from cache with the specified keys.
	 * @param array $keys a list of keys identifying the cached values
	 * @return array a list of cached values indexed by the keys
	 */
	protected function getValues($keys)
	{
		$response = $this->_connection->executeCommand('MGET', $keys);
		$result = array();
		$i = 0;
		foreach($keys as $key) {
			$result[$key] = $response[$i++];
		}
		return $result;
	}

	/**
	 * Stores a value identified by a key in cache.
	 * This is the implementation of the method declared in the parent class.
	 *
	 * @param string $key the key identifying the value to be cached
	 * @param string $value the value to be cached
	 * @param float $expire the number of seconds in which the cached value will expire. 0 means never expire.
	 * This can be a floating point number to specify the time in milliseconds.
	 * @return boolean true if the value is successfully stored into cache, false otherwise
	 */
	protected function setValue($key,$value,$expire)
	{
		if ($expire == 0) {
			return (bool) $this->_connection->executeCommand('SET', array($key, $value));
		} else {
			$expire = (int) ($expire * 1000);
			return (bool) $this->_connection->executeCommand('PSETEX', array($key, $expire, $value));
		}
	}

	/**
	 * Stores a value identified by a key into cache if the cache does not contain this key.
	 * This is the implementation of the method declared in the parent class.
	 *
	 * @param string $key the key identifying the value to be cached
	 * @param string $value the value to be cached
	 * @param float $expire the number of seconds in which the cached value will expire. 0 means never expire.
	 * This can be a floating point number to specify the time in milliseconds.
	 * @return boolean true if the value is successfully stored into cache, false otherwise
	 */
	protected function addValue($key,$value,$expire)
	{
		if ($expire == 0) {
			return (bool) $this->_connection->executeCommand('SETNX', array($key, $value));
		} else {
			// TODO consider requiring redis version >= 2.6.12 that supports this in one command
			$expire = (int) ($expire * 1000);
			$this->_connection->executeCommand('MULTI');
			$this->_connection->executeCommand('SETNX', array($key, $value));
			$this->_connection->executeCommand('PEXPIRE', array($key, $expire));
			$response = $this->_connection->executeCommand('EXEC');
			return (bool) $response[0];
		}
	}

	/**
	 * Deletes a value with the specified key from cache
	 * This is the implementation of the method declared in the parent class.
	 * @param string $key the key of the value to be deleted
	 * @return boolean if no error happens during deletion
	 */
	protected function deleteValue($key)
	{
		return (bool) $this->_connection->executeCommand('DEL', array($key));
	}

	/**
	 * Deletes all values from cache.
	 * This is the implementation of the method declared in the parent class.
	 * @return boolean whether the flush operation was successful.
	 */
	protected function flushValues()
	{
		return $this->_connection->executeCommand('FLUSHDB');
	}
}