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<?php
/**
* User: Marvin Borner
* Date: 14/09/2018
* Time: 23:48
*/
require_once 'mysql_conf.inc';
require_once 'WebRequest.php';
require_once 'Database.php';
require_once 'Algorithms.php';
class CrawlController
{
private static $currentlyCrawled;
public static function start($url = '')
{
set_time_limit(3600000);
error_reporting(E_ERROR | E_PARSE);
while (true) {
self::$currentlyCrawled = $url;
self::crawl(self::$currentlyCrawled);
}
}
private static function crawl($url)
{
if (Database::alreadyCrawled(Algorithms::cleanUrl($url))) {
Database::removeFromQueue(self::$currentlyCrawled);
self::$currentlyCrawled = Database::getFromQueue('DESC');
} else {
$requestResponse = WebRequest::getContent($url);
self::$currentlyCrawled = $requestResponse[3];
if (preg_match('/2\d\d/', $requestResponse[1])) { // success
print 'Download Size: ' . $requestResponse[2];
$htmlPath = Algorithms::createPathFromHtml($requestResponse[0]);
$urlInfo = Algorithms::getUrlInfo($htmlPath);
Database::saveUrlData(self::$currentlyCrawled, $urlInfo);
$allLinks = Algorithms::getLinks($htmlPath);
Database::insertIntoQueue($allLinks);
Database::removeFromQueue(self::$currentlyCrawled);
self::$currentlyCrawled = Database::getFromQueue('DESC'); // set new from start
print "\e[96mFinished previous url - crawling: " . self::$currentlyCrawled . "\n";
} else {
print "\t\e[91mError " . $requestResponse[1] . ' ' . self::$currentlyCrawled . "\n";
Database::urlHasError(self::$currentlyCrawled); // prevents re-crawling of error url
Database::removeFromQueue(self::$currentlyCrawled);
self::$currentlyCrawled = Database::getFromQueue('ASC'); // set new from end
print "\e[91mFinished previous url with error - crawling: " . self::$currentlyCrawled . "\n";
}
}
}
}
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