class Redis {
// 默认配置名称（使用load_config加载）
private $_default_config_path = ‘package/cache/redis‘;
// redis实例对象
private $_redis;
// redis服务器地址
private $_host = ‘‘;
// redis服务器端口
private $_port = 6379;
/**
* 构造函数
*
* @access public
* @param array $conf 配置文件集合, 包含参数：
* string $host 服务器地址
* string $port 服务器端口
* @return void
*/
public function __construct(array $conf=array()) {
$this -> set_conf($conf);
$this -> reconnect(true);
}
/**
* 设置redis配置
* 执行前，配置会被重置为[host=‘‘, port=‘6379‘]
*
* @access public
* @param array $conf 配置文件集合, 包含参数：
* string $host 服务器地址
* string $port 服务器端口
* @return void
*/
public function set_conf(array $conf=array()) {
if (empty($conf)) {
$conf = load_config($this -> _default_config_path);
if (!is_array($conf) or empty($conf)) {
to_log(MAIN_LOG_ERROR, ‘‘, __CLASS__ . ‘:‘ . __FUNCTION__ . ‘: 默认配置为空‘);
return;
}
}
$this -> _host = ‘‘;
$this -> _port = 6379;
isset($conf[‘host‘]) and $this -> _host = $conf[‘host‘];
isset($conf[‘port‘]) and $this -> _port = intval($conf[‘port‘]);
}
/**
* 重新连接redis
*
* @access public
* @param boolean $is_new 是否必须重新连接
* @return boolean
*/
public function reconnect($is_new=false) {
$ret = false;
if ($is_new) {
$ret = $this -> _connect();
return $ret;
}
$check = $this -> _is_connected();
if (!$check) {
$ret = $this -> _connect();
}
return $ret;
}
/**
* 设置缓存数据, 仅支持字符串
*
* @access public
* @param string $key 缓存变量名
* @param string $value 缓存变量值
* @param string $ttl 缓存生存时间，单位:秒
* @return boolean
*/
public function set($key, $value, $ttl=3600) {
$key = strval($key);
$value = strval($value);
$ttl = intval($ttl);
$ttl < 0 and $ttl = 0;
if ($key === ‘‘ or $value === ‘‘) {
return false;
}
try {
$result = $this -> _redis -> setex($key, $ttl, $value);
}catch (\RedisException $e) {
to_log(MAIN_LOG_WARN, ‘‘, __CLASS__ . " -> " . __FUNCTION__ . ": " . $e -> getMessage());
return false;
}
return $result ? true : false;
}
/**
* 重新设置缓存变量的生存时间
*
* @access public
* @param string $key 缓存变量名
* @param string $ttl 缓存生存时间，单位:秒
* @return boolean
*/
public function expire($key, $ttl=3600) {
$key = strval($key);
$ttl = intval($ttl);
$ttl < 0 and $ttl = 0;
if ($key === ‘‘) {
return false;
}
try {
$result = $this -> _redis -> expire($key, $ttl);
}catch (\RedisException $e) {
to_log(MAIN_LOG_WARN, ‘‘, __CLASS__ . " -> " . __FUNCTION__ . ": " . $e -> getMessage());
return false;
}
return $result ? true : false;
}
/**
* 获取缓存变量值
*
* @access public
* @param string $key 缓存变量名
* @return mixed 成功返回变量值，失败返回false
*/
public function get($key) {
$key = strval($key);
if ($key === ‘‘) {
return false;
}
try {
$result = $this -> _redis -> get($key);
}catch (\RedisException $e) {
to_log(MAIN_LOG_WARN, ‘‘, __CLASS__ . " -> " . __FUNCTION__ . ": " . $e -> getMessage());
return false;
}
return $result;
}
/**
* 批量删除缓存变量
*
* @access public
* @param mixed $key [string|array] 当为string时，自动转换为array
* @return boolean
*/
public function delete($key) {
!is_array($key) and $key = array($key);
$tmp_arr = array();
foreach ($key as $val) {
$tmp_str = strval($val);
$tmp_str !== ‘‘ and $tmp_arr[$tmp_str] = 1;
}
$key = array_keys($tmp_arr);
try {
$ret = true;
foreach ($key as $val) {
$result = $this -> _redis -> delete($val);
!$result and $ret = false;
}
}catch(\RedisException $e) {
to_log(MAIN_LOG_WARN, ‘‘, __CLASS__ . " -> " . __FUNCTION__ . ": " . $e -> getMessage());
return false;
}
return $ret;
}
/**
* 清空redis中的所有数据
*
* @access public
* @return boolean
*/
public function clear() {
try {
$result = $this -> _redis -> flushAll();
}catch(\RedisException $e){
to_log(MAIN_LOG_WARN, ‘‘, __CLASS__ . " -> " . __FUNCTION__ . ": " . $e -> getMessage());
return false;
}
return $result ? true : false;
}
/**
* 将缓存变量放入redis队列，仅支持字符串及整型
*
* @access public
* @param string $key 缓存变量名
* @param string $value 缓存变量值
* @param boolean $to_right 是否从右边入列
* @return boolean
*/
public function push($key, $value, $to_right=true) {
$key = strval($key);
$value = strval($value);
if ($key === ‘‘ or $value === ‘‘) {
return false;
}
$func = ‘rPush‘;
!$to_right and $func = ‘lPush‘;
try {
$result = $this -> _redis -> $func($key, $value);
}catch (\RedisException $e) {
to_log(MAIN_LOG_WARN, ‘‘, __CLASS__ . " -> " . __FUNCTION__ . ": " . $e -> getMessage());
return false;
}
return $result ? true : false;
}
/**
* 缓存变量出列
*
* @access public
* @param string $key 缓存变量名
* @param boolean $from_left 是否从左边出列
* @return boolean 成功返回缓存变量值，失败返回false
*/
public function pop($key , $from_left=true) {
$key = strval($key);
if ($key === ‘‘) {
return false;
}
$func = ‘lPop‘;
!$from_left and $func = ‘rPop‘;
try {
$result = $this -> _redis -> $func($key);
}catch(\RedisException $e){
to_log(MAIN_LOG_WARN, ‘‘, __CLASS__ . " -> " . __FUNCTION__ . ": " . $e -> getMessage());
return false;
}
return $result;
}
/**
* 缓存变量自增
*
* @access public
* @param string $key 缓存变量名
* @return boolean
*/
public function increase($key) {
$key = strval($key);
if ($key === ‘‘) {
return false;
}
try {
$result = $this -> _redis -> incr($key);
}catch(\RedisException $e){
to_log(MAIN_LOG_WARN, ‘‘, __CLASS__ . " -> " . __FUNCTION__ . ": " . $e -> getMessage());
return false;
}
return $result ? true : false;
}
/**
* 缓存变量自减
*
* @access public
* @param string $key 缓存变量名
* @return boolean 成功返回TRUE，失败返回FALSE
*/
public function decrease($key) {
$key = strval($key);
if ($key === ‘‘) {
return false;
}
try {
$result = $this -> _redis -> decr($key);
}catch(\RedisException $e){
to_log(MAIN_LOG_WARN, ‘‘, __CLASS__ . " -> " . __FUNCTION__ . ": " . $e -> getMessage());
return false;
}
return $result ? true : false;
}
/**
* 判断缓存变量是否已经存在
*
* @access public
* @param string $key 缓存变量名
* @return boolean 存在返回TRUE，否则返回FALSE
*/
public function exists($key) {
$key = strval($key);
if ($key === ‘‘) {
return false;
}
try {
$result = $this -> _redis -> exists($key);
}catch (\RedisException $e) {
to_log(MAIN_LOG_WARN, ‘‘, __CLASS__ . " -> " . __FUNCTION__ . ": " . $e -> getMessage());
return false;
}
return $result ? true : false;
}
/**
* 返回redis源对象
*
* @access public
* @return object
*/
public function get_handler() {
return $this -> _redis;
}
// ---------私有实现---------------------------------------------
/**
* 检验并连接redis服务器
*
* @access private
* @return boolean
*/
private function _connect() {
if (!class_exists(‘\Redis‘, false)) {
to_log(MAIN_LOG_ERROR, ‘‘, ‘Redis类不存在，可能是没有安装php_redis扩展‘);
return false;
}
try {
$this -> _redis = new \Redis();
$this -> _redis -> connect($this -> _host, $this -> _port);
}catch(\RedisException $e){
to_log(MAIN_LOG_WARN, ‘‘, __CLASS__ . " -> " . __FUNCTION__ . ": " . $e -> getMessage());
return false;
}
return true;
}
/**
* 判断是否已连接到服务器
*
* @access public
* @return boolean
*/
public function _is_connected() {
if(!is_object($this -> _redis)) return false;
try {
$this -> _redis -> ping();
}catch (\RedisException $e) {
to_log(MAIN_LOG_WARN, ‘‘, __CLASS__ . " -> " . __FUNCTION__ . ": " . $e -> getMessage());
return false;
}
return true;
}
}
