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<?php
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// $Id: banner_file.php,v 1.20.2.3 2006/09/23 14:39:43 wulff Exp $
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/**
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* @file
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* The file system cache handler for the banner module.
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*/
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header("Content-Type: application/x-javascript; charset=utf-8");
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$group = (int) $_GET['group'];
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$count = (int) $_GET['count'];
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$terms = (string) $_GET['terms'];
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$path = (string) $_GET['path'];
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$max = (int) $_GET['max'];
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$refresh = 0;
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$output = '';
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for ($i = 1; $i <= $max; $i++) {
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$cache_file = $path.'/.'.$i.'.banner.cache';
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if (!$fd = @fopen($cache_file, "r+")) {
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if ($i == $max) {
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// we failed to open all cache files, try refreshing
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$refresh = 1;
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}
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continue;
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}
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// determine whether to use a blocking lock or a non-blocking lock
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if ($i < $max) {
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if (!flock($fd, LOCK_EX|LOCK_NB)) {
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@fclose($fd);
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continue;
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}
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}
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else { // last cache file, use a blocking-lock
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if (!flock($fd, LOCK_EX)) {
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// something is very wrong, try refreshing cache
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@fclose($fd);
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$refresh = 1;
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break;
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}
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}
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$contents = fread($fd, filesize($cache_file));
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$struct = unserialize($contents);
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$last_updated = $struct[2];
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$tids = explode(',', $terms);
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$ballot_and = array();
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foreach ($tids as $tid) {
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if (isset($struct[0][$tid][$group])) {
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$ballot_and[] = $struct[0][$tid][$group];
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}
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}
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$ballot_or = array();
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foreach ($tids as $tid) {
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if (isset($struct[0][$tid][$group])) {
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foreach ($struct[0][$tid][$group] as $nid)
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$ballot_or[] = $nid;
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}
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}
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$ballot = array();
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if (count($ballot_and) >= 2) {
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$ballot = call_user_func_array('array_intersect', $ballot_and);
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}
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if (empty($ballot)) {
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$ballot = array_unique($ballot_or);
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}
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if (empty($ballot)) {
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foreach ($struct[0][0][$group] as $nid) {
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$ballot[] = $nid;
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}
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}
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$counter = 0;
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while ($counter < $count && count($ballot)) {
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// select a random banner
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$last = count($ballot) - 1;
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if ($last > 0) {
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$random = mt_rand(0, $last);
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}
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else {
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$random = 0;
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}
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$banner_id = $ballot[$random];
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// get banner and remove it from the ballot
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$this_banner = $struct[1][$banner_id];
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array_splice($ballot, $random, 1);
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// add a view
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$struct[1][$banner_id]->views_this++;
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$struct[1][$banner_id]->views++;
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$struct[1][$banner_id]->views_day++;
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$struct[1][$banner_id]->views_week++;
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// if needed, disable this banner
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if ($this_banner->views_max > 0 && ($this_banner->views + 1) >= $this_banner->views_max) {
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include_once './includes/bootstrap.inc';
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drupal_bootstrap(DRUPAL_BOOTSTRAP_DATABASE);
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// reached maximum views, set status to "blocked"
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db_query('UPDATE {banner} SET workflow = 5 WHERE nid = %d', $banner_id);
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$refresh = 1;
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}
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else if ($this_banner->views_day_max > 0 && ($this_banner->views_day + 1) >= $this_banner->views_day_max) {
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include_once './includes/bootstrap.inc';
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drupal_bootstrap(DRUPAL_BOOTSTRAP_DATABASE);
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// reached day's maximum views, set status to "day's limit reached"
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db_query('UPDATE {banner} SET workflow = 2 WHERE nid = %d', $banner_id);
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$refresh = 1;
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}
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else if ($this_banner->views_week_max > 0 && ($this_banner->views_week + 1) >= $this_banner->views_week_max) {
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include_once './includes/bootstrap.inc';
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drupal_bootstrap(DRUPAL_BOOTSTRAP_DATABASE);
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// reached week's maximum views, set status to "week's limit reached"
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db_query('UPDATE {banner} SET workflow = 3 WHERE nid = %d', $banner_id);
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$refresh = 1;
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}
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$output .= $this_banner->html;
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$counter++;
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}
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// once every minute update views in db
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if ($last_updated < (time() - 60)) {
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$struct[2] = time();
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$refresh = 1;
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}
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// dump back in cache
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$data = serialize($struct);
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rewind($fd);
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fwrite($fd, $data, strlen($data));
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flock($fd, LOCK_UN);
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fclose($fd);
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break;
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}
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if ($refresh) {
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include_once './includes/bootstrap.inc';
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drupal_bootstrap(DRUPAL_BOOTSTRAP_FULL);
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drupal_set_header("Content-Type: application/x-javascript; charset=utf-8");
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_banner_refresh_cache();
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}
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print $output;
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