CI中使用redis

- 日理万妓 2022-08-20 04:16 117阅读 0赞

1. 在autoload.php 中加入 如下配置行

$autoload['libraries'] = array('redis');

2. 在/application/config 中加入文件 redis.php  
文件内容如下：

<?php
    // Default connection group
    $config['redis_default']['host'] = 'localhost';		// IP address or host
    $config['redis_default']['port'] = '6379';			// Default Redis port is 6379
    $config['redis_default']['password'] = '';			// Can be left empty when the server does not require AUTH
    
    $config['redis_slave']['host'] = '';
    $config['redis_slave']['port'] = '6379';
    $config['redis_slave']['password'] = '';
    ?>

3. 在 /application/libraries 中加入文件 Redis.php  
文件来源： [redis库文件包][redis]

文件内容：

<?php defined('BASEPATH') OR exit('No direct script access allowed');
    /**
     * CodeIgniter Redis
     *
     * A CodeIgniter library to interact with Redis
     *
     * @package        	CodeIgniter
     * @category    	Libraries
     * @author        	Joël Cox
     * @version			v0.4
     * @link 			https://github.com/joelcox/codeigniter-redis
     * @link			http://joelcox.nl
     * @license			http://www.opensource.org/licenses/mit-license.html
     */
    class CI_Redis {
    
    	/**
    	 * CI
    	 *
    	 * CodeIgniter instance
    	 * @var 	object
    	 */
    	private $_ci;
    
    	/**
    	 * Connection
    	 *
    	 * Socket handle to the Redis server
    	 * @var		handle
    	 */
    	private $_connection;
    
    	/**
    	 * Debug
    	 *
    	 * Whether we're in debug mode
    	 * @var		bool
    	 */
    	public $debug = FALSE;
    
    	/**
    	 * CRLF
    	 *
    	 * User to delimiter arguments in the Redis unified request protocol
    	 * @var		string
    	 */
    	const CRLF = "\r\n";
    
    	/**
    	 * Constructor
    	 */
    	public function __construct($params = array())
    	{
    
    		log_message('debug', 'Redis Class Initialized');
    
    		$this->_ci = get_instance();
    		$this->_ci->load->config('redis');
    
    		// Check for the different styles of configs
    		if (isset($params['connection_group']))
    		{
    			// Specific connection group
    			$config = $this->_ci->config->item('redis_' . $params['connection_group']);
    		}
    		elseif (is_array($this->_ci->config->item('redis_default')))
    		{
    			// Default connection group
    			$config = $this->_ci->config->item('redis_default');
    		}
    		else
    		{
    			// Original config style
    			$config = array(
    				'host' => $this->_ci->config->item('redis_host'),
    				'port' => $this->_ci->config->item('redis_port'),
    				'password' => $this->_ci->config->item('redis_password'),
    			);
    		}
    
    		// Connect to Redis
    		$this->_connection = @fsockopen($config['host'], $config['port'], $errno, $errstr, 3);
    
    		// Display an error message if connection failed
    		if ( ! $this->_connection)
    		{
    			show_error('Could not connect to Redis at ' . $config['host'] . ':' . $config['port']);
    		}
    
    		// Authenticate when needed
    		$this->_auth($config['password']);
    
    	}
    
    	/**
    	 * Call
    	 *
    	 * Catches all undefined methods
    	 * @param	string	method that was called
    	 * @param	mixed	arguments that were passed
    	 * @return 	mixed
    	 */
    	public function __call($method, $arguments)
    	{
    		$request = $this->_encode_request($method, $arguments);
    		return $this->_write_request($request);
    	}
    
    	/**
    	 * Command
    	 *
    	 * Generic command function, just like redis-cli
    	 * @param	string	full command as a string
    	 * @return 	mixed
    	 */
    	public function command($string)
    	{
    		$slices = explode(' ', $string);
    		$request = $this->_encode_request($slices[0], array_slice($slices, 1));
    
    		return $this->_write_request($request);
    	}
    
    	/**
    	 * Auth
    	 *
    	 * Runs the AUTH command when password is set
    	 * @param 	string	password for the Redis server
    	 * @return 	void
    	 */
    	private function _auth($password = NULL)
    	{
    
    		// Authenticate when password is set
    		if ( ! empty($password))
    		{
    
    			// See if we authenticated successfully
    			if ($this->command('AUTH ' . $password) !== 'OK')
    			{
    				show_error('Could not connect to Redis, invalid password');
    			}
    
    		}
    
    	}
    
    	/**
    	 * Clear Socket
    	 *
    	 * Empty the socket buffer of theconnection so data does not bleed over
    	 * to the next message.
    	 * @return 	NULL
    	 */
    	public function _clear_socket()
    	{
    		// Read one character at a time
    		fflush($this->_connection);
    		return NULL;
    	}
    
    	/**
    	 * Write request
    	 *
    	 * Write the formatted request to the socket
    	 * @param	string 	request to be written
    	 * @return 	mixed
    	 */
    	private function _write_request($request)
    	{
    		if ($this->debug === TRUE)
    		{
    			log_message('debug', 'Redis unified request: ' . $request);
    		}
    
    		// How long is the data we are sending?
    		$value_length = strlen($request);
    
    		// If there isn't any data, just return
    		if ($value_length <= 0) return NULL;
    
    
    		// Handle reply if data is less than or equal to 8192 bytes, just send it over
    		if ($value_length <= 8192)
    		{
    			fwrite($this->_connection, $request);
    		}
    		else
    		{
    			while ($value_length > 0)
    			{
    
    				// If we have more than 8192, only take what we can handle
    				if ($value_length > 8192) {
    					$send_size = 8192;
    				}
    
    				// Send our chunk
    				fwrite($this->_connection, $request, $send_size);
    
    				// How much is left to send?
    				$value_length = $value_length - $send_size;
    
    				// Remove data sent from outgoing data
    				$request = substr($request, $send_size, $value_length);
    
    			}
    		}
    
    		// Read our request into a variable
    		$return = $this->_read_request();
    
    		// Clear the socket so no data remains in the buffer
    		$this->_clear_socket();
    
    		return $return;
    	}
    
    	/**
    	 * Read request
    	 *
    	 * Route each response to the appropriate interpreter
    	 * @return 	mixed
    	 */
    	private function _read_request()
    	{
    		$type = fgetc($this->_connection);
    
    		// Times we will attempt to trash bad data in search of a
    		// valid type indicator
    		$response_types = array('+', '-', ':', '$', '*');
    		$type_error_limit = 50;
    		$try = 0;
    
    		while ( ! in_array($type, $response_types) && $try < $type_error_limit)
    		{
    			$type = fgetc($this->_connection);
    			$try++;
    		}
    
    		if ($this->debug === TRUE)
    		{
    			log_message('debug', 'Redis response type: ' . $type);
    		}
    
    		switch ($type)
    		{
    			case '+':
    				return $this->_single_line_reply();
    				break;
    			case '-':
    				return $this->_error_reply();
    				break;
    			case ':':
    				return $this->_integer_reply();
    				break;
    			case '$':
    				return $this->_bulk_reply();
    				break;
    			case '*':
    				return $this->_multi_bulk_reply();
    				break;
    			default:
    				return FALSE;
    		}
    
    	}
    
    	/**
    	 * Single line reply
    	 *
    	 * Reads the reply before the EOF
    	 * @return 	mixed
    	 */
    	private function _single_line_reply()
    	{
    		$value = rtrim(fgets($this->_connection));
            $this->_clear_socket();
    
    		return $value;
    	}
    
    	/**
    	 * Error reply
    	 *
    	 * Write error to log and return false
    	 * @return 	bool
    	 */
    	private function _error_reply()
    	{
    		// Extract the error message
    		$error = substr(rtrim(fgets($this->_connection)), 4);
    
    		log_message('error', 'Redis server returned an error: ' . $error);
            $this->_clear_socket();
    
    		return FALSE;
    	}
    
    	/**
    	 * Integer reply
    	 *
    	 * Returns an integer reply
    	 * @return 	int
    	 */
    	private function _integer_reply()
    	{
    		return (int) rtrim(fgets($this->_connection));
    	}
    
        /**
         * Bulk reply
         *
         * Reads to amount of bits to be read and returns value within
         * the pointer and the ending delimiter
         * @return  string
         */
        private function _bulk_reply()
        {
    
    		// How long is the data we are reading? Support waiting for data to
    		// fully return from redis and enter into socket.
            $value_length = (int) fgets($this->_connection);
    
            if ($value_length <= 0) return NULL;
    
            $response = '';
    
    		// Handle reply if data is less than or equal to 8192 bytes, just read it
    		if ($value_length <= 8192)
    		{
    			$response = fread($this->_connection, $value_length);
    		}
    		else
    		{
    			$data_left = $value_length;
    
    				// If the data left is greater than 0, keep reading
    	        	while ($data_left > 0 ) {
    
    				// If we have more than 8192, only take what we can handle
    				if ($data_left > 8192)
    				{
    					$read_size = 8192;
    				}
    				else
    				{
    					$read_size = $data_left;
    				}
    
    				// Read our chunk
    				$chunk = fread($this->_connection, $read_size);
    
    				// Support reading very long responses that don't come through
    				// in one fread
    
    				$chunk_length = strlen($chunk);
    				while ($chunk_length < $read_size)
    				{
    					$keep_reading = $read_size - $chunk_length;
    					$chunk .= fread($this->_connection, $keep_reading);
    					$chunk_length = strlen($chunk);
    				}
    
    				$response .= $chunk;
    
    				// Re-calculate how much data is left to read
    				$data_left = $data_left - $read_size;
    
    			}
    
    		}
    
    		// Clear the socket in case anything remains in there
    		$this->_clear_socket();
    
    	return isset($response) ? $response : FALSE;
        }
    
    	/**
    	 * Multi bulk reply
    	 *
    	 * Reads n bulk replies and return them as an array
    	 * @return 	array
    	 */
    	private function _multi_bulk_reply()
    	{
    		// Get the amount of values in the response
    		$response = array();
    		$total_values = (int) fgets($this->_connection);
    
    		// Loop all values and add them to the response array
    		for ($i = 0; $i < $total_values; $i++)
    		{
    			// Remove the new line and carriage return before reading
    			// another bulk reply
    			fgets($this->_connection, 2);
    
    			// If this is a second or later pass, we also need to get rid
    			// of the $ indicating a new bulk reply and its length.
    			if ($i > 0)
    			{
    				fgets($this->_connection);
    				fgets($this->_connection, 2);
    			}
    
    			$response[] = $this->_bulk_reply();
    
    		}
    
    		// Clear the socket
    		$this->_clear_socket();
    
    		return isset($response) ? $response : FALSE;
    	}
    
    	/**
    	 * Encode request
    	 *
    	 * Encode plain-text request to Redis protocol format
    	 * @link 	http://redis.io/topics/protocol
    	 * @param 	string 	request in plain-text
    	 * @param   string  additional data (string or array, depending on the request)
    	 * @return 	string 	encoded according to Redis protocol
    	 */
        private function _encode_request($method, $arguments = array())
        {
            $request = '$' . strlen($method) . self::CRLF . $method . self::CRLF;
            $_args = 1;
    
            // Append all the arguments in the request string
            foreach ($arguments as $argument)
            {
                if (is_array($argument))
                {
                    foreach ($argument as $key => $value)
                    {
                        // Prepend the key if we're dealing with a hash
                        if (!is_int($key))
                        {
                            $request .= '$' . strlen($key) . self::CRLF . $key . self::CRLF;
                            $_args++;
                        }
    
                        $request .= '$' . strlen($value) . self::CRLF . $value . self::CRLF;
                        $_args++;
                    }
                }
                else
                {
                    $request .= '$' . strlen($argument) . self::CRLF . $argument . self::CRLF;
                    $_args++;
                }
            }
    
            $request = '*' . $_args . self::CRLF . $request;
    
            return $request;
        }
    
    	/**
    	 * Info
    	 *
    	 * Overrides the default Redis response, so we can return a nice array
    	 * of the server info instead of a nasty string.
    	 * @return 	array
    	 */
    	public function info($section = FALSE)
    	{
    		if ($section !== FALSE)
    		{
    			$response = $this->command('INFO '. $section);
    		}
    		else
    		{
    			$response = $this->command('INFO');
    		}
    
    		$data = array();
    		$lines = explode(self::CRLF, $response);
    
    		// Extract the key and value
    		foreach ($lines as $line)
    		{
    			$parts = explode(':', $line);
    			if (isset($parts[1])) $data[$parts[0]] = $parts[1];
    		}
    
    		return $data;
    	}
    
    	/**
    	 * Debug
    	 *
    	 * Set debug mode
    	 * @param	bool 	set the debug mode on or off
    	 * @return 	void
    	 */
    	public function debug($bool)
    	{
    		$this->debug = (bool) $bool;
    	}
    
    	/**
    	 * Destructor
    	 *
    	 * Kill the connection
    	 * @return 	void
    	 */
    	function __destruct()
    	{
    		if ($this->_connection) fclose($this->_connection);
    	}
    }
    
    ?>

4. 然后你就可以 在文件中这样使用了

<?php
     
    	if($this->redis->get('mark_'.$gid) === null){ //如果未设置 
    		$this->redis->set('mark_'.$gid, $giftnum); //设置
    		$this->redis->EXPIRE('mark_'.$gid, 30*60); //设置过期时间 （30 min）
    	}else{
    		$giftnum =  $this->redis->get('mark_'.$gid);  //从缓存中直接读取对应的值
    	}
    
    ?>

5. 重点是你所需要的 东东在这里很详细的讲解了  
所有要用的函数只需要更改 $redis  ==> $this->redis

[php中操作redis库函数][php_redis]

需要注意的是：（1）你的本地需要安装 redis服务([windows安装][windows])  
                         （2）并开启redis 服务  
                         （3）不管是windows 还是linux 都需要装 php对应版本的 redis扩展

[redis]: https://github.com/joelcox/codeigniter-redis
[php_redis]: http://www.cnblogs.com/ikodota/archive/2012/03/05/php_redis_cn.html
[windows]: http://www.wujiangwei.win/?p=20