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<?php
/**
* PHP Text Cache is a simple caching class for for saving/retrieving local copies of url data
* @package php_text_cache
* @version 0.3-pre
* @copyright (C) 2004 John Heinstein. All rights reserved
* @license http://www.gnu.org/copyleft/lesser.html LGPL License
* @author John Heinstein <johnkarl@nbnet.nb.ca>
* @link http://www.engageinteractive.com/php_text_cache/ PHP Text Cache Home Page
* PHP Text Cache is Free Software
**/
if (!defined('PHP_TEXT_CACHE_INCLUDE_PATH')) {
define('PHP_TEXT_CACHE_INCLUDE_PATH', (dirname(__FILE__) . "/"));
}
require_once(PHP_TEXT_CACHE_INCLUDE_PATH . 'php_http_connector.php');
/**
* A simple caching class for saving/retrieving local copies of url data
*
* @package php_text_cache
* @author John Heinstein <johnkarl@nbnet.nb.ca>
*/
class php_text_cache extends php_http_connector {
/** @var string The directory in which cached files are stored */
var $cacheDir;
/** @var int The amount time of time to wait before a cached file should be updated */
var $cacheTime;
/** @var boolean True if an HTTP client should be used to establish the connection */
var $doUseHTTPClient;
/** @var int Time in seconds to disconnect after attempting an http connection */
var $httpTimeout;
/**
* Constructor
* @param string Directory in which to store the cache files
* @param int Expiry time for cache file (-1 signifies no expiry limit)
* @param int Time in seconds to disconnect after attempting an http connection
*/
function php_text_cache($cacheDir = './', $cacheTime = -1, $timeout = 0) {
$this->cacheDir = $cacheDir;
$this->cacheTime = $cacheTime;
$this->timeout = $timeout;
} //php_text_cache
/**
* Specifies the default timeout value for connecting to a host
* @param int The number of seconds to timeout when attempting to connect to a server
*/
function setTimeout($timeout) {
$this->timeout = $timeout;
} //setTimeout
/**
* Gets data from an url, or its cache file
*
* @param string The url of the data
* @return string The data at the specified url
*/
function getData($url) {
$cacheFile = $this->getCacheFileName($url);
if (is_file($cacheFile)) {
$fileStats = stat($cacheFile);
$lastChangeTime = $fileStats[9]; //mtime
$currTime = time();
if (($this->cacheTime != -1) && ($currTime - $lastChangeTime) > $this->cacheTime) { //get data from url
return $this->fromURL($url, $cacheFile);
}
else { //get data from file
return $this->fromCache($cacheFile);
}
}
else {
return $this->fromURL($url, $cacheFile);
}
} //getData
/**
* Given an url, returns the path to the cache file
*
* Uses an md5 hash of the url. This can be
* overridden if a different approach is required
*
* @param string The url of the data
* @return string The cache file name
*/
function getCacheFileName($url) {
return ($this->cacheDir . md5($url));
} //getCacheFileName
/**
* Establishes a connection, given an url
* @param string The url of the data
*/
function establishConnection($url) {
require_once(PHP_TEXT_CACHE_INCLUDE_PATH . 'php_http_client_generic.php');
$host = php_http_connection::formatHost($url);
$host = substr($host, 0, strpos($host, '/'));
$this->setConnection($host, '/', 80, $this->timeout);
} //establishConnection
/**
* Specifies whether an HTTP client should be used to establish a connection
* @param boolean True if an HTTP client is to be used to establish the connection
*/
function useHTTPClient($truthVal) {
// fixes bug identified here: sarahk.pcpropertymanager.com/blog/using-domit-rss/225/
//$this->doUseHTTPClient = truthVal;
$this->doUseHTTPClient = $truthVal;
} //useHTTPClient
/**
* Gets data from an url and caches a copy of the data
* @param string The url for the data
* @param string The cache file path
* @return string The contents of the url
*/
function fromURL($url, $cacheFile) {
$fileContents = '';
if ($this->httpConnection != null) {
$response =& $this->httpConnection->get($url);
if ($response != null) {
$fileContents = $response->getResponse();
}
}
else if ($this->doUseHTTPClient) {
$this->establishConnection($url);
$response =& $this->httpConnection->get($url);
if ($response != null) {
$fileContents = $response->getResponse();
}
}
else {
$fileContents = $this->fromFile($url);
}
//if file is empty, might need to establish an
//http connection to get the data
if (($fileContents == '') && !$this->doUseHTTPClient) {
$this->establishConnection($url);
$response =& $this->httpConnection->get($url);
if ($response != null) {
$fileContents = $response->getResponse();
}
}
if ($fileContents != '') {
require_once(PHP_TEXT_CACHE_INCLUDE_PATH . 'php_file_utilities.php');
php_file_utilities::putDataToFile($cacheFile, $fileContents, 'w');
}
return $fileContents;
} //fromURL
/**
* Get text from cache file
* @param string The file path
* @return string The text contained in the file, or an empty string
*/
function fromCache($cacheFile) {
return $this->fromFile($cacheFile);
} //fromCache
/**
* Get text from an url or file
* @param string The url or file path
* @return string The text contained in the url or file, or an empty string
*/
function fromFile($filename) {
if (function_exists('file_get_contents')) {
return @file_get_contents($filename);
}
else {
require_once(PHP_TEXT_CACHE_INCLUDE_PATH . 'php_file_utilities.php');
$fileContents =& php_file_utilities::getDataFromFile($filename, 'r');
return $fileContents;
}
return '';
} //fromFile
} //php_text_cache
?>