/**
* Consume a message, extracts the URL from it and crawls the webpage.
*
* @param \PhpAmqpLib\Message\AMQPMessage $message
*/
public function crawlUrl(AMQPMessage $message)
{
$data = json_decode($message->body, true);
$crawlJob = new CrawlJob($data['url'], $data['base_url'], $data['blacklist'], $data['metadata'], $data['whitelist']);
if (false === $crawlJob->isAllowedToCrawl()) {
$this->indexer->deleteDocument($message);
$this->queue->rejectMessage($message);
$this->markAsSkipped($crawlJob, 'info', 'Not allowed to crawl');
return;
}
if ($this->indexer->isUrlIndexedAndNotExpired($crawlJob->getUrl(), $crawlJob->getMetadata())) {
$this->queue->rejectMessage($message);
$this->markAsSkipped($crawlJob, 'info', 'Not expired yet');
return;
}
try {
$this->spider->getRequestHandler()->getClient()->setUserAgent($this->userAgent);
$this->spider->getRequestHandler()->getClient()->getConfig()->set('request.params', ['redirect.disable' => true]);
$this->spider->crawl($crawlJob);
$this->logMessage('info', sprintf("Crawling %s", $crawlJob->getUrl()), $crawlJob->getUrl(), $data['metadata']['core']);
$this->queue->acknowledge($message);
} catch (ClientErrorResponseException $e) {
switch ($e->getResponse()->getStatusCode()) {
case 301:
$this->indexer->deleteDocument($message);
$this->queue->rejectMessage($message);
$this->markAsSkipped($crawlJob, 'warning', $e->getMessage());
$newCrawlJob = new CrawlJob($e->getResponse()->getInfo('redirect_url'), $crawlJob->getBaseUrl(), $crawlJob->getBlacklist(), $crawlJob->getMetadata(), $crawlJob->getWhitelist());
$this->queue->publishJob($newCrawlJob);
break;
case 403:
case 401:
case 500:
$this->queue->rejectMessage($message);
$this->markAsSkipped($crawlJob, 'warning', 'status: ' . $e->getResponse()->getStatusCode());
break;
case 404:
case 418:
$this->indexer->deleteDocument($message);
$this->logMessage('warning', sprintf("Deleted %s", $crawlJob->getUrl()), $crawlJob->getUrl(), $data['metadata']['core']);
$this->queue->rejectMessage($message);
break;
default:
$this->queue->rejectMessageAndRequeue($message);
$this->markAsFailed($crawlJob, $e->getResponse()->getStatusCode());
break;
}
} catch (Exception $e) {
$this->queue->rejectMessage($message);
$this->markAsFailed($crawlJob, $e->getMessage());
}
unset($crawlJob, $message, $data);
gc_collect_cycles();
}
/**
* Writes the found URL as a job on the queue.
*
* And URL is only persisted to the queue when it not has been indexed yet.
*
* @param \Symfony\Component\EventDispatcher\GenericEvent $event
*/
public function onDiscoverUrl(Event $event)
{
$crawlJob = $event->getSubject()->getCurrentCrawlJob();
foreach ($event['uris'] as $uri) {
if ($position = strpos($uri, '#')) {
$uri = new Uri(substr($uri, 0, $position));
}
$isBlacklisted = UrlCheck::isUrlBlacklisted($uri->normalize()->toString(), $crawlJob->getBlacklist());
if ($isBlacklisted) {
$this->eventDispatcher->dispatch("spider.crawl.blacklisted", new Event($this, ['uri' => $uri]));
continue;
//url blacklisted, so go to next one
}
if (!$this->indexer->isUrlIndexedandNotExpired(UrlCheck::fixUrl($uri->toString()), $crawlJob->getMetadata())) {
$job = new CrawlJob(UrlCheck::fixUrl($uri->normalize()->toString()), (new Uri($crawlJob->getUrl()))->normalize()->toString(), $crawlJob->getBlacklist(), $crawlJob->getMetadata(), $crawlJob->getWhitelist());
if ($job->isAllowedToCrawl()) {
$this->queue->publishJob($job);
}
}
}
}
