/**
* Gets the cached version of a web page from the machine on which it was
* fetched.
*
* Complete cached versions of web pages typically only live on a fetcher
* machine. The queue server machine typically only maintains summaries.
* This method makes a REST request of a fetcher machine for a cached page
* and get the results back.
*
* @param string $machine the ip address of domain name of the machine the
* cached page lives on
* @param string $machine_uri the path from document root on $machine where
* the yioop scripts live
* @param int $partition the partition in the WebArchiveBundle the page is
* in
* @param int $offset the offset in bytes into the WebArchive partition in
* the WebArchiveBundle at which the cached page lives.
* @param string $crawl_time the timestamp of the crawl the cache page is
* from
* @param int $instance_num which fetcher instance for the particular
* fetcher crawled the page (if more than one), false otherwise
* @return array page data of the cached page
*/
function getCacheFile($machine, $machine_uri, $partition, $offset, $crawl_time, $instance_num = false)
{
$time = time();
$session = md5($time . AUTH_KEY);
if ($machine == '::1') {
//IPv6 :(
$machine = "[::1]";
//used if the fetching and queue serving were on the same machine
}
// we assume all machines use the same scheme & port of the name server
$port = UrlParser::getPort(NAME_SERVER);
$scheme = UrlParser::getScheme(NAME_SERVER);
$request = "{$scheme}://{$machine}:{$port}{$machine_uri}?c=archive&a=cache&" . "time={$time}&session={$session}&partition={$partition}&offset={$offset}" . "&crawl_time={$crawl_time}";
if ($instance_num !== false) {
$request .= "&instance_num={$instance_num}";
}
$tmp = FetchUrl::getPage($request);
$page = @unserialize(base64_decode($tmp));
$page['REQUEST'] = $request;
return $page;
}
