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Prepared Gawker bridge by extracting file cache from initial Liberation bridge

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This commit is contained in:
Riduidel 2014-03-03 14:12:24 +01:00
parent 62a5265433
commit f2f82c7d03
2 changed files with 55 additions and 36 deletions
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37
bridges/Les400Culs.php
View file

@ -6,7 +6,7 @@
* @update 20/02/2014
*/
define("SEXE", "http://sexes.blogs.liberation.fr");
class Les400Culs extends BridgeAbstract{
class Les400Culs extends HttpCachingBridgeAbstract{
public function collectData(array $param){
$html = file_get_html($this->getURI()) or $this->returnError('Could not request '.$this->getURI(), 404);
@ -60,39 +60,4 @@ class Les400Culs extends BridgeAbstract{
public function getDescription(){
return "La planète sexe, vue et racontée par Agnès Giard. Et par rss-bridge";
}
/**
* Maintain locally cached versions of pages to download to avoid multiple doiwnloads.
* A file name is generated by replacing all "/" by "_", and the file is saved below this bridge cache
* @param url url to cache
* @return content of file as string
*/
public function get_cached($url) {
$simplified_url = str_replace(["http://", "https://", "?", "&"], ["", "", "/", "/"], $url);
$filename = __DIR__ . '/../cache/'."pages/".$simplified_url;
if (substr($filename, -1) == '/') {
$filename = $filename."index.html";
}
if(!file_exists($filename)) {
error_log("we have no local copy of ".$url." Downloading !");
$dir = substr($filename, 0, strrpos($filename, '/'));
if(!is_dir($dir)) {
mkdir($dir, 0777, true);
}
$this->download_remote($url, $filename);
}
return file_get_contents($filename);
}
public function download_remote($url , $save_path) {
$f = fopen( $save_path , 'w+');
$handle = fopen($url , "rb");
while (!feof($handle)) {
$contents = fread($handle, 8192);
fwrite($f , $contents);
}
fclose($handle);
fclose($f);
}
}

54
lib/Bridge.php
View file

@ -73,6 +73,60 @@ abstract class BridgeAbstract implements BridgeInterface{
}
}
/**
* Extension of BridgeAbstract allowing caching of files downloaded over http files.
* This is specially useful for sites from Gawker or Liberation networks, which allow pages excerpts top be viewed together on index, while full pages have to be downloaded
* separately.
* This class mainly provides a get_cached method which will will download the file from its remote location.
* TODO allow file cache invalidation by touching files on access, and removing files/directories which have not been touched since ... a long time
* After all, rss-bridge is not respaw, isn't it ?
*/
abstract class HttpCachingBridgeAbstract extends BridgeAbstract {
/**
* Maintain locally cached versions of pages to download to avoid multiple doiwnloads.
* A file name is generated by replacing all "/" by "_", and the file is saved below this bridge cache
* @param url url to cache
* @return content of file as string
*/
public function get_cached($url) {
$simplified_url = str_replace(["http://", "https://", "?", "&"], ["", "", "/", "/"], $url);
// TODO build this from the variable given to Cache
$pageCacheDir = __DIR__ . '/../cache/'."pages/";
$filename = $pageCacheDir.$simplified_url;
if (substr($filename, -1) == '/') {
$filename = $filename."index.html";
}
if(file_exists($filename)) {
// TODO touch file and its parent, and try to do neighbour deletion
$currentPath = $filename;
while(!$pageCacheDir==$currentPath) {
touch($currentPath);
$currentPath = dirname($currentPath);
}
} else {
error_log("we have no local copy of ".$url." Downloading !");
$dir = substr($filename, 0, strrpos($filename, '/'));
if(!is_dir($dir)) {
mkdir($dir, 0777, true);
}
$this->download_remote($url, $filename);
}
return file_get_contents($filename);
}
public function download_remote($url , $save_path) {
$f = fopen( $save_path , 'w+');
$handle = fopen($url , "rb");
while (!feof($handle)) {
$contents = fread($handle, 8192);
fwrite($f , $contents);
}
fclose($handle);
fclose($f);
}
}
class Bridge{
static protected $dirBridge;