From db02d84a40fd282c9d74b5f02315515c15033e9c Mon Sep 17 00:00:00 2001
From: Marina Glancy <marina@moodle.com>
Date: Tue, 31 Jul 2012 11:08:25 +0800
Subject: [PATCH] MDL-34290 remove class cache_file as not used

in fact we have moodle filepool that can work perfectly for caching files, no need to create new class and storage
---
 lib/cronlib.php |   4 --
 lib/filelib.php | 167 ------------------------------------------------
 2 files changed, 171 deletions(-)

diff --git a/lib/cronlib.php b/lib/cronlib.php
index 457336af0c9..c0b86afb8c1 100644
--- a/lib/cronlib.php
+++ b/lib/cronlib.php
@@ -466,10 +466,6 @@ function cron_run() {
     $fs = get_file_storage();
     $fs->cron();
 
-    mtrace("Clean up cached external files");
-    // 1 week
-    cache_file::cleanup(array(), 60 * 60 * 24 * 7);
-
     mtrace("Cron script completed correctly");
 
     $difftime = microtime_diff($starttime, microtime());
diff --git a/lib/filelib.php b/lib/filelib.php
index 14217a72c9a..cef949a58de 100644
--- a/lib/filelib.php
+++ b/lib/filelib.php
@@ -4271,170 +4271,3 @@ function file_pluginfile($relativepath, $forcedownload, $preview = null) {
     }
 
 }
-
-/**
- * Universe file cacheing class
- *
- * @package    core_files
- * @category   files
- * @copyright  2012 Dongsheng Cai {@link http://dongsheng.org}
- * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
- */
-class cache_file {
-    /** @var string */
-    public $cachedir = '';
-
-    /**
-     * static method to create cache_file class instance
-     *
-     * @param array $options caching ooptions
-     */
-    public static function get_instance($options = array()) {
-        return new cache_file($options);
-    }
-
-    /**
-     * Constructor
-     *
-     * @param array $options
-     */
-    private function __construct($options = array()) {
-        global $CFG;
-
-        // Path to file caches.
-        if (isset($options['cachedir'])) {
-            $this->cachedir = $options['cachedir'];
-        } else {
-            $this->cachedir = $CFG->cachedir . '/filedir';
-        }
-
-        // Create cache directory.
-        if (!file_exists($this->cachedir)) {
-            mkdir($this->cachedir, $CFG->directorypermissions, true);
-        }
-
-        // When use cache_file::get, it will check ttl.
-        if (isset($options['ttl']) && is_numeric($options['ttl'])) {
-            $this->ttl = $options['ttl'];
-        } else {
-            // One day.
-            $this->ttl = 60 * 60 * 24;
-        }
-    }
-
-    /**
-     * Get cached file, false if file expires
-     *
-     * @param mixed $param
-     * @param array $options caching options
-     * @return bool|string
-     */
-    public static function get($param, $options = array()) {
-        $instance = self::get_instance($options);
-        $filepath = $instance->generate_filepath($param);
-        if (file_exists($filepath)) {
-            $lasttime = filemtime($filepath);
-            if (time() - $lasttime > $instance->ttl) {
-                // Remove cache file.
-                unlink($filepath);
-                return false;
-            } else {
-                return $filepath;
-            }
-        } else {
-            return false;
-        }
-    }
-
-    /**
-     * Static method to create cache from a file
-     *
-     * @param mixed $ref
-     * @param string $srcfile
-     * @param array $options
-     * @return string cached file path
-     */
-    public static function create_from_file($ref, $srcfile, $options = array()) {
-        $instance = self::get_instance($options);
-        $cachedfilepath = $instance->generate_filepath($ref);
-        copy($srcfile, $cachedfilepath);
-        return $cachedfilepath;
-    }
-
-    /**
-     * Static method to create cache from url
-     *
-     * @param mixed $ref file reference
-     * @param string $url file url
-     * @param array $options options
-     * @return string cached file path
-     */
-    public static function create_from_url($ref, $url, $options = array()) {
-        $instance = self::get_instance($options);
-        $cachedfilepath = $instance->generate_filepath($ref);
-        $fp = fopen($cachedfilepath, 'w');
-        $curl = new curl;
-        $curl->download(array(array('url'=>$url, 'file'=>$fp)));
-        // Must close file handler.
-        fclose($fp);
-        return $cachedfilepath;
-    }
-
-    /**
-     * Static method to create cache from string
-     *
-     * @param mixed $ref file reference
-     * @param string $url file url
-     * @param array $options options
-     * @return string cached file path
-     */
-    public static function create_from_string($ref, $string, $options = array()) {
-        $instance = self::get_instance($options);
-        $cachedfilepath = $instance->generate_filepath($ref);
-        $fp = fopen($cachedfilepath, 'w');
-        fwrite($fp, $string);
-        // Must close file handler.
-        fclose($fp);
-        return $cachedfilepath;
-    }
-
-    /**
-     * Build path to cache file
-     *
-     * @param mixed $ref
-     * @return string
-     */
-    private function generate_filepath($ref) {
-        global $CFG;
-        $hash = sha1(serialize($ref));
-        $l1 = $hash[0].$hash[1];
-        $l2 = $hash[2].$hash[3];
-        $dir = $this->cachedir . "/$l1/$l2";
-        if (!file_exists($dir)) {
-            mkdir($dir, $CFG->directorypermissions, true);
-        }
-        return "$dir/$hash";
-    }
-
-    /**
-     * Remove cache files
-     *
-     * @param array $options options
-     * @param int $expire The number of seconds before expiry
-     */
-    public static function cleanup($options = array(), $expire) {
-        global $CFG;
-        $instance = self::get_instance($options);
-        if ($dir = opendir($instance->cachedir)) {
-            while (($file = readdir($dir)) !== false) {
-                if (!is_dir($file) && $file != '.' && $file != '..') {
-                    $lasttime = @filemtime($instance->cachedir . $file);
-                    if(time() - $lasttime > $expire){
-                        @unlink($instance->cachedir . $file);
-                    }
-                }
-            }
-            closedir($dir);
-        }
-    }
-}