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<?php
namespace phinde;
class Crawler
{
protected $es;
protected $queue;
/**
* If the links only should be shown, not queued
*/
protected $showLinksOnly = false;
static $supportedIndexTypes = array(
'application/atom+xml' => '\\phinde\\LinkExtractor\\Atom',
'application/xhtml+xml' => '\\phinde\\LinkExtractor\\Html',
'text/html' => '\\phinde\\LinkExtractor\\Html',
);
public function __construct()
{
$this->es = new Elasticsearch($GLOBALS['phinde']['elasticsearch']);
$this->queue = new Queue();
}
public function crawl($url)
{
$res = $this->fetch($url);
if ($res === false) {
return;
}
$linkInfos = $this->extractLinks($res);
if ($this->showLinksOnly) {
$this->showLinks($linkInfos);
} else {
$this->enqueue($linkInfos);
}
}
protected function fetch($url)
{
$existingDoc = $this->es->get($url);
$req = new HttpRequest($url);
$req->setHeader(
'accept',
implode(',', array_keys(static::$supportedIndexTypes))
);
if ($existingDoc) {
$nMoDate = strtotime($existingDoc->modate);
$req->setHeader('If-Modified-Since: ' . date('r', $nMoDate));
}
$res = $req->send();
if ($res->getStatus() === 304) {
//not modified since last time, so don't crawl again
return false;
} else if ($res->getStatus() !== 200) {
throw new \Exception(
"Response code is not 200 but "
. $res->getStatus() . ", stopping"
);
}
return $res;
}
protected function extractLinks(\HTTP_Request2_Response $res)
{
$mimetype = explode(';', $res->getHeader('content-type'))[0];
if (!isset(static::$supportedIndexTypes[$mimetype])) {
echo "MIME type not supported for indexing: $mimetype\n";
return array();
}
$class = static::$supportedIndexTypes[$mimetype];
$extractor = new $class();
return $extractor->extract($res);
}
protected function enqueue($linkInfos)
{
foreach ($linkInfos as $linkInfo) {
if ($this->es->isKnown($linkInfo->url)) {
continue;
}
$this->es->markQueued($linkInfo->url);
$this->queue->addToIndex(
$linkInfo->url, $linkInfo->title, $linkInfo->source
);
if (Helper::isUrlAllowed($linkInfo->url)) {
$this->queue->addToCrawl($linkInfo->url);
}
}
}
protected function showLinks($linkInfos)
{
foreach ($linkInfos as $linkInfo) {
echo $linkInfo->url . "\n";
if ($linkInfo->title) {
echo ' title: ' . $linkInfo->title . "\n";
echo ' source: ' . $linkInfo->source . "\n";
}
}
}
public function setShowLinksOnly($showLinksOnly)
{
$this->showLinksOnly = $showLinksOnly;
}
}
?>
|
