function ad_cache_file_increment in Advertisement 6

Same name and namespace in other branches

1. 5.2 cache/file/ad_cache_file.inc \ad_cache_file_increment()
2. 5 cache/file/ad_cache_file.inc \ad_cache_file_increment()
3. 6.3 cache/file/ad_cache_file.inc \ad_cache_file_increment()
4. 6.2 cache/file/ad_cache_file.inc \ad_cache_file_increment()
5. 7 cache/file/ad_cache_file.inc \ad_cache_file_increment()

File

cache/file/ad_cache_file.inc, line 309

A plug in for the ad.module, providing a file cache mechanism for improved performance when displaying ads.

Code

function ad_cache_file_increment($action = 'view', $aid) {
  _debug_echo("File cache: incrementing '{$action}'.");
  $cache_file = ad_cache_file_get_lock();
  if ($cache_file) {
    $cache = unserialize(fread(adserve_variable('fd'), filesize($cache_file)));
    $hostid = adserve_variable('hostid') ? adserve_variable('hostid') : 'none';
    $aid = adserve_variable('aid');
    if ($action == 'view') {
      if ($hostid != 'none' && !isset($cache['hostid'][$hostid])) {
        _debug_echo("File cache: invalid hostid: {$hostid}");
        $output = 'You do not have permission to display images.';

        // TODO: We should still log this.  Perhaps a new $action type?
        return -1;
      }
    }
    $last_sync = $cache['last_sync'];
    $lifetime = $cache['lifetime'];
    $time = time();
    $timestamp = date('YmdH');

    // Increment action counter.
    if (isset($cache['ad'][$aid][$hostid]) && isset($cache['ad'][$aid][$hostid]['counts'][$action]) && isset($cache['ad'][$aid][$hostid]['counts'][$action][$timestamp])) {
      $cache['ad'][$aid][$hostid]['counts'][$action][$timestamp]++;
    }
    else {
      $cache['ad'][$aid][$hostid]['counts'][$action][$timestamp] = 1;
    }

    // Write updated cache back to file and release the lock.
    $cache = serialize($cache);
    rewind(adserve_variable('fd'));
    ftruncate(adserve_variable('fd'), 0);
    fwrite(adserve_variable('fd'), $cache, strlen($cache));
    flock(adserve_variable('fd'), LOCK_UN);
    fclose(adserve_variable('fd'));
    adserve_variable('fd', '');

    // Every $lifetime seconds we flush the cache files to the database.
    if ($last_sync < time() - $lifetime) {
      ad_cache_file_rebuild();
    }
    return 1;
  }
  return 0;
}