private function warmCache($key)
{
if (self::$_cacheWarmupInitiated) {
return;
}
self::$_cacheWarmupInitiated = true;
// require apc for checking whether warmup is already in progress
if (!function_exists('apc_fetch')) {
return;
}
$key = "cache-warmup-{$key}";
// abort warming if a previous warmup started less than 10 seconds ago
if (apc_fetch($key) !== false) {
return;
}
// flag we are running a warmup for the current request
apc_store($key, true, self::WARM_CACHE_TTL);
$uri = $_SERVER["REQUEST_URI"];
$fp = fsockopen('127.0.0.1', 80, $errno, $errstr, 1);
if ($fp === false) {
error_log("warmCache - Couldn't open a socket [" . $uri . "]", 0);
return;
}
$method = $_SERVER["REQUEST_METHOD"];
$out = "{$method} {$uri} HTTP/1.1\r\n";
$sentHeaders = self::getRequestHeaders();
$sentHeaders["Connection"] = "Close";
// mark request as a warm cache request in order to disable caching and pass the http/https protocol (the warmup always uses http)
$sentHeaders[self::WARM_CACHE_HEADER] = isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on' ? "https" : "http";
// if the request wasn't proxied pass the ip on the X-FORWARDED-FOR header
if (!isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
$sentHeaders["X-FORWARDED-FOR"] = $_SERVER['REMOTE_ADDR'];
$sentHeaders["X-FORWARDED-SERVER"] = kConf::get('remote_addr_header_server');
}
foreach ($sentHeaders as $header => $value) {
$out .= "{$header}:{$value}\r\n";
}
$out .= "\r\n";
if ($method == "POST") {
$postParams = array();
foreach ($_POST as $key => &$val) {
if (is_array($val)) {
$val = implode(',', $val);
}
$postParams[] = $key . '=' . urlencode($val);
}
$out .= implode('&', $postParams);
}
fwrite($fp, $out);
fclose($fp);
}