CI框架(CodeIgniter)操作redis的方法详解

_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); } } ?>

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