/** * Returns the path to the cached rss feed contents. Creates/updates the cache if necessary. * @param stdClass $context the context * @param array $args the arguments received in the url * @return string the full path to the cached RSS feed directory. Null if there is a problem. */ function forum_rss_get_feed($context, $args) { global $CFG, $DB, $USER; $status = true; //are RSS feeds enabled? if (empty($CFG->forum_enablerssfeeds)) { debugging('DISABLED (module configuration)'); return null; } $forumid = clean_param($args[3], PARAM_INT); $cm = get_coursemodule_from_instance('forum', $forumid, 0, false, MUST_EXIST); $modcontext = context_module::instance($cm->id); //context id from db should match the submitted one if ($context->id != $modcontext->id || !has_capability('mod/forum:viewdiscussion', $modcontext)) { return null; } $forum = $DB->get_record('forum', array('id' => $forumid), '*', MUST_EXIST); if (!rss_enabled_for_mod('forum', $forum)) { return null; } //the sql that will retreive the data for the feed and be hashed to get the cache filename list($sql, $params) = forum_rss_get_sql($forum, $cm); // Hash the sql to get the cache file name. $filename = rss_get_file_name($forum, $sql, $params); $cachedfilepath = rss_get_file_full_name('mod_forum', $filename); //Is the cache out of date? $cachedfilelastmodified = 0; if (file_exists($cachedfilepath)) { $cachedfilelastmodified = filemtime($cachedfilepath); } // Used to determine if we need to generate a new RSS feed. $dontrecheckcutoff = time() - 60; // Sixty seconds ago. // If it hasn't been generated we need to create it. // Otherwise, if it has been > 60 seconds since we last updated, check for new items. if (($cachedfilelastmodified == 0) || (($dontrecheckcutoff > $cachedfilelastmodified) && forum_rss_newstuff($forum, $cm, $cachedfilelastmodified))) { // Need to regenerate the cached version. $result = forum_rss_feed_contents($forum, $sql, $params, $modcontext); $status = rss_save_file('mod_forum', $filename, $result); } //return the path to the cached version return $cachedfilepath; }
/** * Returns the path to the cached rss feed contents. Creates/updates the cache if necessary. * @param stdClass $context the context * @param array $args the arguments received in the url * @return string the full path to the cached RSS feed directory. Null if there is a problem. */ function forum_rss_get_feed($context, $args) { global $CFG, $DB; $status = true; //are RSS feeds enabled? if (empty($CFG->forum_enablerssfeeds)) { debugging('DISABLED (module configuration)'); return null; } $forumid = clean_param($args[3], PARAM_INT); $cm = get_coursemodule_from_instance('forum', $forumid, 0, false, MUST_EXIST); if ($cm) { $modcontext = get_context_instance(CONTEXT_MODULE, $cm->id); //context id from db should match the submitted one if ($context->id != $modcontext->id || !has_capability('mod/forum:viewdiscussion', $modcontext)) { return null; } } $forum = $DB->get_record('forum', array('id' => $forumid), '*', MUST_EXIST); if (!rss_enabled_for_mod('forum', $forum)) { return null; } //the sql that will retreive the data for the feed and be hashed to get the cache filename $sql = forum_rss_get_sql($forum, $cm); //hash the sql to get the cache file name $filename = rss_get_file_name($forum, $sql); $cachedfilepath = rss_get_file_full_name('mod_forum', $filename); //Is the cache out of date? $cachedfilelastmodified = 0; if (file_exists($cachedfilepath)) { $cachedfilelastmodified = filemtime($cachedfilepath); } //if the cache is more than 60 seconds old and there's new stuff $dontrecheckcutoff = time()-60; if ( $dontrecheckcutoff > $cachedfilelastmodified && forum_rss_newstuff($forum, $cm, $cachedfilelastmodified)) { //need to regenerate the cached version $result = forum_rss_feed_contents($forum, $sql); if (!empty($result)) { $status = rss_save_file('mod_forum',$filename,$result); } } //return the path to the cached version return $cachedfilepath; }