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<?php |
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namespace PiedWeb\SeoPocketCrawler; |
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use PiedWeb\UrlHarvester\Harvest; |
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class Crawler |
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{ |
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/** |
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* @var int number of Urls we can crawled before saving (0 = autosaving disabled) |
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*/ |
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const AUTOSAVE = 500; |
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/** @var string */ |
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protected $harvester = '\PiedWeb\SeoPocketCrawler\CrawlerUrl'; |
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protected $currentClick = 0; |
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protected $counter = 0; |
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protected $urls = []; |
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/** |
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* @var CrawlerConfig |
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*/ |
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protected $config; |
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/** @var bool */ |
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protected $debug = true; |
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public function __construct( |
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string $startUrl, |
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string $ignore, |
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int $limit, |
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string $userAgent, |
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int $cacheMethod = Recorder::CACHE_ID, |
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int $wait = 100000, // microSeconds ! |
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bool $debug = true, |
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?string $dataDirectory = null |
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) { |
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$this->config = new CrawlerConfig($startUrl, $ignore, $limit, $userAgent, $cacheMethod, $wait, $dataDirectory); |
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$this->urls[$this->config->getStartUrl()] = null; |
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$this->config->recordConfig(); |
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$this->debug = $debug; |
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} |
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public function getConfig(): CrawlerConfig |
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{ |
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return $this->config; |
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} |
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public function crawl() |
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{ |
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$nothingUpdated = true; |
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$this->printDebugInitCrawlLoop(); |
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foreach ($this->urls as $urlToParse => $url) { |
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if (null !== $url && (false === $url->can_be_crawled || true === $url->can_be_crawled)) { // déjà crawlé |
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continue; |
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} |
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// additionnal check not required ?! |
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//elseif ($this->currentClick > $this->config->getLimit()) { |
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// break; |
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//} |
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$this->printDebugCrawlUrl($urlToParse); |
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$nothingUpdated = false; |
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++$this->counter; |
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if (null === $this->urls[$urlToParse]) { |
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$url = $this->urls[$urlToParse] = new Url($this->config->getBase().$urlToParse, $this->currentClick); |
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} |
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if (false !== $this->canBeCrawled($url)) { |
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$crawlerUrl = new $this->harvester($url, $this->config); |
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if ($crawlerUrl->getHarvester() instanceof Harvest) { |
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$this->updateInboundLinksAndUrlsToParse($url, $crawlerUrl->getLinks()); |
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$this->config->getRecorder()->recordLinksIndex( |
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$this->config->getBase(), |
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$url, |
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$this->urls, |
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$crawlerUrl->getHarvester()->getLinks() |
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); |
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} |
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$this->urls[$urlToParse]->setDiscovered(count($this->urls)); |
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$this->config->cacheRobotsTxt($crawlerUrl->getHarvester()); |
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$this->config->cacheRequest($crawlerUrl->getHarvester()); |
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usleep($this->config->getWait()); |
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} |
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$this->autosave(); |
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} |
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++$this->currentClick; |
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// Record after each Level: |
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$this->config->getRecorder()->record($this->urls); |
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$record = $nothingUpdated || $this->currentClick >= $this->config->getLimit(); |
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return $record ? null : $this->crawl(); |
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} |
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protected function autosave() |
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{ |
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if (0 !== $this->counter && $this->counter / self::AUTOSAVE == round($this->counter / self::AUTOSAVE)) { |
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echo $this->debug ? ' --- auto-save'.PHP_EOL : ''; |
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$this->getRecorder()->record($this->urls); |
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} |
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} |
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protected function canBeCrawled(Url $url) |
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{ |
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if (null === $url->can_be_crawled) { |
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$url->can_be_crawled = $this->config->getVirtualRobots() |
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->allows($this->config->getBase().$url->uri, $this->config->getUserAgent()); |
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} |
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return $url->can_be_crawled; |
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} |
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public function updateInboundLinksAndUrlsToParse(Url $url, array $links) |
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{ |
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$everAdd = []; |
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foreach ($links as $link) { |
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$newUri = $link->getUrl()->getRelativizedDocumentUrl(); |
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$this->urls[$newUri] = $this->urls[$newUri] ?? new Url($link->getPageUrl(), ($this->currentClick + 1)); |
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if (! isset($everAdd[$newUri])) { |
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$everAdd[$newUri] = 1; |
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if (! $link->mayFollow()) { |
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++$this->urls[$newUri]->inboundlinks_nofollow; |
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} else { |
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++$this->urls[$newUri]->inboundlinks; |
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} |
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$this->getRecorder()->recordInboundLink($link, $url, $this->urls[$newUri]); |
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} |
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} |
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} |
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protected function printDebugCrawlUrl(string $urlToParse) |
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{ |
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if ($this->debug) { |
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echo $this->counter.'/'.count($this->urls).' '.$this->config->getBase().$urlToParse.PHP_EOL; |
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} |
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} |
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protected function printDebugInitCrawlLoop() |
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{ |
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if ($this->debug) { |
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echo PHP_EOL.PHP_EOL.'// -----'.PHP_EOL.'// '.$this->counter.' crawled / ' |
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.count($this->urls).' found '.PHP_EOL.'// -----'.PHP_EOL; |
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} |
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} |
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protected function getRecorder() |
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{ |
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return $this->config->getRecorder(); |
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} |
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} |
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PiedWeb /
SeoPocketCrawler
