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<?php if (!defined('BASEPATH')) exit('No direct script access allowed');
/**
* Code Igniter
*
* An open source application development framework for PHP 4.3.2 or newer
*
* @package CodeIgniter
* @author Rick Ellis
* @copyright Copyright (c) 2006, pMachine, Inc.
* @license http://www.codeignitor.com/user_guide/license.html
* @link http://www.codeigniter.com
* @since Version 1.0
* @filesource
*/
// ------------------------------------------------------------------------
/**
* Output Class
*
* Responsible for sending final output to browser
*
* @package CodeIgniter
* @subpackage Libraries
* @category Output
* @author Rick Ellis
* @link http://www.codeigniter.com/user_guide/libraries/output.html
*/
class CI_Output {
var $final_output;
var $cache_expiration = 0;
function CI_Output()
{
log_message('debug', "Output Class Initialized");
}
// --------------------------------------------------------------------
/**
* Get Output
*
* Returns the current output string
*
* @access public
* @return string
*/
function get_output()
{
return $this->final_output;
}
// --------------------------------------------------------------------
/**
* Set Output
*
* Sets the output string
*
* @access public
* @param string
* @return void
*/
function set_output($output)
{
$this->final_output = $output;
}
// --------------------------------------------------------------------
/**
* Set Cache
*
* @access public
* @param integer
* @return void
*/
function cache($time)
{
$this->cache_expiration = ( ! ctype_digit($time)) ? 0 : $time;
}
// --------------------------------------------------------------------
/**
* Display Output
*
* All "view" data is automatically put into this variable
* by the controller class:
*
* $this->final_output
*
* This function simply echos the variable out. It also does the following:
*
* Stops the benchmark timer so the page rendering speed can be shown.
*
* Determines if the "memory_get_usage' function is available so that
* the memory usage can be shown.
*
* @access public
* @return void
*/
function _display($output = '')
{
$BM =& _load_class('CI_Benchmark');
if ($output == '')
{
$output =& $this->final_output;
}
if ($this->cache_expiration > 0)
{
$this->_write_cache($output);
}
$elapsed = $BM->elapsed_time('code_igniter_start', 'code_igniter_end');
$memory = ( ! function_exists('memory_get_usage')) ? '0' : round(memory_get_usage()/1024/1024, 2).'MB';
$output = str_replace('{memory_usage}', $memory, $output);
$output = str_replace('{elapsed_time}', $elapsed, $output);
echo $output;
log_message('debug', "Final output sent to browser");
log_message('debug', "Total execution time: ".$elapsed);
}
// --------------------------------------------------------------------
/**
* Write a Cache File
*
* @access public
* @return void
*/
function _write_cache($output)
{
$obj =& get_instance();
$path = $obj->config->item('cache_path');
$cache_path = ($path == '') ? BASEPATH.'cache/' : $path;
if ( ! is_dir($cache_path) OR ! is_writable($cache_path))
{
return;
}
$uri = $obj->config->item('base_url', 1).
$obj->config->item('index_page').
$obj->uri->uri_string();
$cache_path .= md5($uri);
if ( ! $fp = @fopen($cache_path, 'wb'))
{
log_message('error', "Unable to write ache file: ".$cache_path);
return;
}
$expire = time() + ($this->cache_expiration * 60);
flock($fp, LOCK_EX);
fwrite($fp, $expire.'TS--->'.$output);
flock($fp, LOCK_UN);
fclose($fp);
@chmod($cache_path, 0777);
log_message('debug', "Cache file written: ".$cache_path);
}
// --------------------------------------------------------------------
/**
* Update/serve a cached file
*
* @access public
* @return void
*/
function _display_cache()
{
$CFG =& _load_class('CI_Config');
$RTR =& _load_class('CI_Router');
$cache_path = ($CFG->item('cache_path') == '') ? BASEPATH.'cache/' : $CFG->item('cache_path');
if ( ! is_dir($cache_path) OR ! is_writable($cache_path))
{
return FALSE;
}
// Build the file path. The file name is an MD5 hash of the full URI
$uri = $CFG->item('base_url', 1).$CFG->item('index_page').$RTR->uri_string;
$filepath = $cache_path.md5($uri);
if ( ! @file_exists($filepath))
{
return FALSE;
}
if ( ! $fp = @fopen($filepath, 'rb'))
{
return FALSE;
}
flock($fp, LOCK_SH);
$cache = '';
if (filesize($filepath) > 0)
{
$cache = fread($fp, filesize($filepath));
}
flock($fp, LOCK_UN);
fclose($fp);
// Strip out the embedded timestamp
if ( ! preg_match("/(\d+TS--->)/", $cache, $match))
{
return FALSE;
}
// Has the file expired? If so we'll delete it.
if (time() >= trim(str_replace('TS--->', '', $match['1'])))
{
@unlink($filepath);
log_message('debug', "Cache file has expired. File deleted");
return FALSE;
}
// Display the cache
$this->_display(str_replace($match['0'], '', $cache));
log_message('debug', "Cache file is current. Sending it to browser.");
return TRUE;
}
}
// END Output Class
?>
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