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YGGo/crontab/crawler.php

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<?php
// Lock multi-thread execution
$semaphore = sem_get(crc32('crontab.crawler'), 1);
if (false === sem_acquire($semaphore, true)) {
echo 'Process locked by another thread.' . PHP_EOL;
exit;
}
// Load system dependencies
require_once('../config/app.php');
require_once('../library/curl.php');
require_once('../library/robots.php');
require_once('../library/filter.php');
require_once('../library/parser.php');
require_once('../library/mysql.php');
// Check disk quota
if (CRAWL_STOP_DISK_QUOTA_MB_LEFT > disk_free_space('/') / 1000000) {
echo 'Disk quota reached.' . PHP_EOL;
exit;
}
// Debug
$timeStart = microtime(true);
$httpRequestsTotal = 0;
$httpRequestsSizeTotal = 0;
$httpDownloadSizeTotal = 0;
$httpRequestsTimeTotal = 0;
$hostPagesProcessed = 0;
$manifestsProcessed = 0;
$hostPagesIndexed = 0;
$manifestsAdded = 0;
$hostPagesAdded = 0;
$hostsAdded = 0;
$hostPagesBanned = 0;
$hostPagesSnapAdded = 0;
// Connect database
$db = new MySQL(DB_HOST, DB_PORT, DB_NAME, DB_USERNAME, DB_PASSWORD);
$db->beginTransaction();
try {
// Process manifests crawl queue
foreach ($db->getManifestCrawlQueue(CRAWL_MANIFEST_LIMIT, time() - CRAWL_MANIFEST_SECONDS_OFFSET) as $queueManifest) {
$curl = new Curl($queueManifest->url, CRAWL_CURLOPT_USERAGENT);
// Update curl stats
$httpRequestsTotal++;
$httpRequestsSizeTotal += $curl->getSizeRequest();
$httpDownloadSizeTotal += $curl->getSizeDownload();
$httpRequestsTimeTotal += $curl->getTotalTime();
// Update manifest index anyway, with the current time and http code
$manifestsProcessed += $db->updateManifestCrawlQueue($queueManifest->manifestId, time(), $curl->getCode());
// Skip processing non 200 code
if (200 != $curl->getCode()) {
continue;
}
// Skip processing without returned data
if (!$remoteManifest = $curl->getContent()) {
continue;
}
// Skip processing on json encoding error
if (!$remoteManifest = @json_decode($remoteManifest)) {
continue;
}
// Skip processing on required fields missed
if (empty($remoteManifest->status) ||
empty($remoteManifest->result->config->crawlUrlRegexp) ||
empty($remoteManifest->result->api->version) ||
empty($remoteManifest->result->api->hosts)) {
continue;
}
// Skip processing on API version not compatible
if ($remoteManifest->result->api->version !== CRAWL_MANIFEST_API_VERSION) {
continue;
}
// Skip processing on host API not available
if (!$remoteManifest->result->api->hosts) {
continue;
}
// Skip processing on crawlUrlRegexp does not match CRAWL_URL_REGEXP condition
if ($remoteManifest->result->config->crawlUrlRegexp !== CRAWL_URL_REGEXP) {
continue;
}
// Skip processing on host link does not match condition
if (false === preg_match(CRAWL_URL_REGEXP, $remoteManifest->result->api->hosts)) {
continue;
}
// Begin hosts collection
$curl = new Curl($remoteManifest->result->api->hosts, CRAWL_CURLOPT_USERAGENT);
// Update curl stats
$httpRequestsTotal++;
$httpRequestsSizeTotal += $curl->getSizeRequest();
$httpDownloadSizeTotal += $curl->getSizeDownload();
$httpRequestsTimeTotal += $curl->getTotalTime();
// Skip processing non 200 code
if (200 != $curl->getCode()) {
continue;
}
// Skip processing without returned data
if (!$remoteManifestHosts = $curl->getContent()) {
continue;
}
// Skip processing on json encoding error
if (!$remoteManifestHosts = @json_decode($remoteManifestHosts)) {
continue;
}
// Skip processing on required fields missed
if (empty($remoteManifestHosts->status) ||
empty($remoteManifestHosts->result)) {
continue;
}
// Begin hosts processing
foreach ($remoteManifestHosts->result as $remoteManifestHost) {
// Skip processing on required fields missed
if (empty($remoteManifestHost->scheme) ||
empty($remoteManifestHost->name)) {
continue;
}
$hostURL = $remoteManifestHost->scheme . '://' .
$remoteManifestHost->name .
(!empty($remoteManifestHost->port) ? ':' . $remoteManifestHost->port : false);
// Validate formatted link
if (filter_var($hostURL, FILTER_VALIDATE_URL) && preg_match(CRAWL_URL_REGEXP, $hostURL)) {
// Host not exists
if (!$db->getHost(crc32($hostURL))) {
// Get robots.txt if exists
$curl = new Curl($hostURL . '/robots.txt', CRAWL_CURLOPT_USERAGENT);
// Update curl stats
$httpRequestsTotal++;
$httpRequestsSizeTotal += $curl->getSizeRequest();
$httpDownloadSizeTotal += $curl->getSizeDownload();
$httpRequestsTimeTotal += $curl->getTotalTime();
if (200 == $curl->getCode() && false !== stripos($curl->getContent(), 'user-agent:')) {
$hostRobots = $curl->getContent();
} else {
$hostRobots = CRAWL_ROBOTS_DEFAULT_RULES;
}
$hostRobotsPostfix = CRAWL_ROBOTS_POSTFIX_RULES;
$hostStatus = CRAWL_HOST_DEFAULT_STATUS ? 1 : 0;
$hostNsfw = CRAWL_HOST_DEFAULT_NSFW ? 1 : 0;
$hostMetaOnly = CRAWL_HOST_DEFAULT_META_ONLY ? 1 : 0;
$hostPageLimit = CRAWL_HOST_DEFAULT_PAGES_LIMIT;
$hostId = $db->addHost( $remoteManifestHosts->result->scheme,
$remoteManifestHosts->result->name,
$remoteManifestHosts->result->port,
crc32($hostURL),
time(),
null,
$hostPageLimit,
(string) $hostMetaOnly,
(string) $hostStatus,
(string) $hostNsfw,
$hostRobots,
$hostRobotsPostfix);
// Add web root host page to make host visible in the crawl queue
$db->addHostPage($hostId, crc32('/'), '/', time());
// Increase counters
$hostPagesAdded++;
$hostsAdded++;
}
}
}
}
// Process pages crawl queue
foreach ($db->getHostPageCrawlQueue(CRAWL_PAGE_LIMIT, time() - CRAWL_PAGE_SECONDS_OFFSET) as $queueHostPage) {
// Build URL from the DB
$queueHostPageURL = $queueHostPage->scheme . '://' . $queueHostPage->name . ($queueHostPage->port ? ':' . $queueHostPage->port : false) . $queueHostPage->uri;
// Init page request
$curl = new Curl($queueHostPageURL, CRAWL_CURLOPT_USERAGENT);
// Update curl stats
$httpRequestsTotal++;
$httpRequestsSizeTotal += $curl->getSizeRequest();
$httpDownloadSizeTotal += $curl->getSizeDownload();
$httpRequestsTimeTotal += $curl->getTotalTime();
// Update page index anyway, with the current time and http code
$hostPagesProcessed += $db->updateHostPageCrawlQueue($queueHostPage->hostPageId, time(), $curl->getCode());
// Skip page processing non 200 code
if (200 != $curl->getCode()) {
$hostPagesBanned += $db->updateHostPageTimeBanned($queueHostPage->hostPageId, time());
continue;
}
// Validate MIME content type
if ($contentType = $curl->getContentType()) {
$db->updateHostPageMime($queueHostPage->hostPageId, Filter::mime($contentType), time());
// Ban page if not available
} else {
$hostPagesBanned += $db->updateHostPageTimeBanned($queueHostPage->hostPageId, time());
continue;
}
// Parse index MIME
$hostPageIsDom = false;
$hostPageInMime = false;
foreach ((array) explode(',', CRAWL_PAGE_MIME_INDEX) as $mime) {
$mime = Filter::mime($mime);
// Check for DOM
if (false !== stripos('text/html', $mime)) {
$hostPageIsDom = true;
$hostPageInMime = true;
break;
}
// Ban page on MIME type not allowed in settings
if (false !== stripos(Filter::mime($contentType), $mime)) {
$hostPageInMime = true;
break;
}
}
// Ban page not in MIME list
if (!$hostPageInMime) {
$hostPagesBanned += $db->updateHostPageTimeBanned($queueHostPage->hostPageId, time());
continue;
}
// Skip page processing without returned data
if (!$content = $curl->getContent()) {
$hostPagesBanned += $db->updateHostPageTimeBanned($queueHostPage->hostPageId, time());
continue;
}
// Define variables
$title = null;
$description = null;
$keywords = null;
$robots = null;
$yggoManifest = null;
// Is DOM content
if ($hostPageIsDom) {
// Parse content
$dom = new DomDocument();
@$dom->loadHTML($content);
// Skip index page links without titles
$title = @$dom->getElementsByTagName('title');
if ($title->length == 0) {
$hostPagesBanned += $db->updateHostPageTimeBanned($queueHostPage->hostPageId, time());
continue;
} else {
$title = $title->item(0)->nodeValue;
}
// Get optional page meta data
foreach (@$dom->getElementsByTagName('meta') as $meta) {
if (@$meta->getAttribute('name') == 'description') {
$description = @$meta->getAttribute('content');
}
if (@$meta->getAttribute('name') == 'keywords') {
$keywords = @$meta->getAttribute('content');
}
if (@$meta->getAttribute('name') == 'robots') {
$robots = @$meta->getAttribute('content');
// Ban page with meta robots:noindex value
if (false !== stripos($robots, 'noindex')) {
$hostPagesBanned += $db->updateHostPageTimeBanned($queueHostPage->hostPageId, time());
continue;
}
// Skip page with meta robots:nofollow attribute
if (false !== stripos($robots, 'nofollow')) {
continue;
}
}
// Grab meta yggo:manifest link when available
if (@$meta->getAttribute('name') == 'yggo:manifest') {
$yggoManifest = Filter::url(@$meta->getAttribute('content'));
}
}
}
// Add queued page description if not exists
if ($title || $description || $keywords) {
$db->addHostPageDescription($queueHostPage->hostPageId,
$title ? Filter::pageTitle($title) : null,
$description ? Filter::pageDescription($description) : null,
$keywords ? Filter::pageKeywords($keywords) : null,
$content ? ($queueHostPage->crawlMetaOnly ? null : base64_encode($content)) : null,
time());
}
// Update manifest registry
if (CRAWL_MANIFEST && !empty($yggoManifest) && filter_var($yggoManifest, FILTER_VALIDATE_URL) && preg_match(CRAWL_URL_REGEXP, $yggoManifest)) {
$yggoManifestCRC32 = crc32($yggoManifest);
if (!$db->getManifest($yggoManifestCRC32)) {
$db->addManifest($yggoManifestCRC32,
$yggoManifest,
(string) CRAWL_MANIFEST_DEFAULT_STATUS,
time());
$manifestsAdded++;
}
}
// Save local snap
if (false !== CRAWL_PAGE_MIME_SNAP_LOCAL) {
foreach ((array) explode(',', CRAWL_PAGE_MIME_SNAP_LOCAL) as $mime) {
$mime = Filter::mime($mime);
// MIME type allowed in settings
if (false !== stripos(Filter::mime($contentType), $mime)) {
$crc32data = crc32($content);
// Create not duplicated data snaps only for each storage host
if (!$db->getHostPageSnap($queueHostPage->hostPageId, $crc32data)) {
$time = time();
$directory = chunk_split($queueHostPage->hostPageId, 1, '/');
@mkdir('../public/snap/hp/' . $directory, 0755, true);
$zip = new ZipArchive();
// Create new container
if (true === $zip->open('../public/snap/hp/' . $directory . $time . '.zip', ZipArchive::CREATE)) {
// Insert compressed snap data
if (true === $zip->addFromString('DATA', $content) &&
true === $zip->addFromString('META', sprintf('TIMESTAMP: %s', $time) . PHP_EOL .
sprintf('CRC32: %s', $crc32data . PHP_EOL .
sprintf('MIME: %s', Filter::mime($contentType)) . PHP_EOL .
sprintf('SOURCE: %s', Filter::url(WEBSITE_DOMAIN . '/snap/hp/' . $directory . $time . '.zip')) . PHP_EOL .
sprintf('TARGET: %s', Filter::url($queueHostPageURL))))) {
// Update DB registry
$hostPagesSnapAdded += $db->addHostPageSnap($queueHostPage->hostPageId, $crc32data, $time);
}
}
$zip->close();
}
break;
}
}
}
// Begin page links collection
$links = [];
// Collect image links
foreach (@$dom->getElementsByTagName('img') as $img) {
// Skip images without src attribute
if (!$src = @$img->getAttribute('src')) {
continue;
}
// Skip images without alt attribute
if (!$alt = @$img->getAttribute('alt')) {
continue;
}
if (!$title = @$img->getAttribute('title')) {
$title = null;
}
// Skip encoded content
if (false !== stripos($src, 'data:')) {
continue;
}
// Add link to queue
$links[] = [
'title' => null,
'description' => null,
'keywords' => Filter::pageKeywords($alt . ($title ? ',' . $title : '')),
'data' => null,
'mime' => null,
'ref' => $src,
];
}
// Collect media links
foreach (@$dom->getElementsByTagName('source') as $source) {
// Skip images without src attribute
if (!$src = @$source->getAttribute('src')) {
continue;
}
// Skip media without type attribute
if (!$type = @$source->getAttribute('type')) {
continue;
}
// Skip encoded content
if (false !== stripos($src, 'data:')) {
continue;
}
// Add link to queue
$links[] = [
'title' => null,
'description' => null,
'keywords' => null,
'data' => null,
'mime' => Filter::mime($type),
'ref' => $src,
];
}
foreach (@$dom->getElementsByTagName('video') as $video) {
// Skip images without src attribute
if (!$src = @$video->getAttribute('src')) {
continue;
}
// Skip media without type attribute
if (!$type = @$video->getAttribute('type')) {
$type = 'video/*';
}
// Skip encoded content
if (false !== stripos($src, 'data:')) {
continue;
}
// Add link to queue
$links[] = [
'title' => null,
'description' => null,
'keywords' => null,
'data' => null,
'mime' => Filter::mime($type),
'ref' => $src,
];
}
foreach (@$dom->getElementsByTagName('audio') as $audio) {
// Skip images without src attribute
if (!$src = @$audio->getAttribute('src')) {
continue;
}
// Skip media without type attribute
if (!$type = @$audio->getAttribute('type')) {
$type = 'audio/*';
}
// Skip encoded content
if (false !== stripos($src, 'data:')) {
continue;
}
// Add link to queue
$links[] = [
'title' => null,
'description' => null,
'keywords' => null,
'data' => null,
'mime' => Filter::mime($type),
'ref' => $src,
];
}
// Collect internal links from page content
foreach(@$dom->getElementsByTagName('a') as $a) {
// Skip links without required attribute
if (!$href = @$a->getAttribute('href')) {
continue;
}
// Get title attribute if available
if (!$title = @$a->getAttribute('title')) {
$title = null;
}
// Skip anchor links
if (false !== stripos($href, '#')) {
continue;
}
// Skip javascript links
if (false !== stripos($href, 'javascript:')) {
continue;
}
// Skip mailto links
if (false !== stripos($href, 'mailto:')) {
continue;
}
// Skip x-raw-image links
if (false !== stripos($href, 'x-raw-image:')) {
continue;
}
// Add link to queue
$links[] = [
'title' => null,
'description' => null,
'keywords' => Filter::pageKeywords($title),
'data' => null,
'mime' => null,
'ref' => $href,
];
}
// Process links collected
foreach ($links as $link) {
//Make relative links absolute
if (!parse_url($link['ref'], PHP_URL_HOST)) {
$link['ref'] = $queueHostPage->scheme . '://' .
$queueHostPage->name .
($queueHostPage->port ? ':' . $queueHostPage->port : '') .
'/' . trim(ltrim(str_replace(['./', '../'], '', $link['ref']), '/'), '.');
}
// Validate formatted link
if (filter_var($link['ref'], FILTER_VALIDATE_URL) && preg_match(CRAWL_URL_REGEXP, $link['ref'])) {
// Parse formatted link
$hostURL = Parser::hostURL($link['ref']);
$hostPageURI = Parser::uri($link['ref']);
// Host exists
if ($host = $db->getHost(crc32($hostURL->string))) {
$hostStatus = $host->status;
$hostNsfw = $host->nsfw;
$hostPageLimit = $host->crawlPageLimit;
$hostMetaOnly = $host->crawlMetaOnly;
$hostId = $host->hostId;
$hostRobots = $host->robots;
$hostRobotsPostfix = $host->robotsPostfix;
// Register new host
} else {
// Get robots.txt if exists
$curl = new Curl($hostURL->string . '/robots.txt', CRAWL_CURLOPT_USERAGENT);
// Update curl stats
$httpRequestsTotal++;
$httpRequestsSizeTotal += $curl->getSizeRequest();
$httpDownloadSizeTotal += $curl->getSizeDownload();
$httpRequestsTimeTotal += $curl->getTotalTime();
if (200 == $curl->getCode() && false !== stripos($curl->getContent(), 'user-agent:')) {
$hostRobots = $curl->getContent();
} else {
$hostRobots = CRAWL_ROBOTS_DEFAULT_RULES;
}
$hostRobotsPostfix = CRAWL_ROBOTS_POSTFIX_RULES;
$hostStatus = CRAWL_HOST_DEFAULT_STATUS ? 1 : 0;
$hostNsfw = CRAWL_HOST_DEFAULT_NSFW ? 1 : 0;
$hostMetaOnly = CRAWL_HOST_DEFAULT_META_ONLY ? 1 : 0;
$hostPageLimit = CRAWL_HOST_DEFAULT_PAGES_LIMIT;
$hostId = $db->addHost( $hostURL->scheme,
$hostURL->name,
$hostURL->port,
crc32($hostURL->string),
time(),
null,
$hostPageLimit,
(string) $hostMetaOnly,
(string) $hostStatus,
(string) $hostNsfw,
$hostRobots,
$hostRobotsPostfix);
// Add web root host page to make host visible in the crawl queue
$db->addHostPage($hostId, crc32('/'), '/', time());
// Increase counters
$hostPagesAdded++;
$hostsAdded++;
// When page is root, skip next operations
if ($hostPageURI->string == '/') {
continue;
}
}
// Init robots parser
$robots = new Robots(($hostRobots ? (string) $hostRobots : (string) CRAWL_ROBOTS_DEFAULT_RULES) . PHP_EOL . ($hostRobotsPostfix ? (string) $hostRobotsPostfix : (string) CRAWL_ROBOTS_POSTFIX_RULES));
// Save page info
if ($hostStatus && // host enabled
$robots->uriAllowed($hostPageURI->string) && // page allowed by robots.txt rules
$hostPageLimit > $db->getTotalHostPages($hostId)) { // pages quantity not reached host limit
if ($hostPage = $db->getHostPage($hostId, crc32($hostPageURI->string))) {
$hostPageId = $hostPage->hostPageId;
} else {
$hostPageId = $db->addHostPage($hostId, crc32($hostPageURI->string), $hostPageURI->string, time());
$db->addHostPageDescription($hostPageId,
$link['title'],
$link['description'],
$link['keywords'],
$hostMetaOnly ? null : ($link['data'] ? base64_encode($link['data']) : null),
time(),
null,
null,
null,
$link['mime']);
$hostPagesAdded++;
}
$db->addHostPageToHostPage($queueHostPage->hostPageId, $hostPageId);
}
}
}
}
$db->commit();
} catch(Exception $e) {
var_dump($e);
$db->rollBack();
}
// Debug
$executionTimeTotal = microtime(true) - $timeStart;
$httpRequestsTimeTotal = $httpRequestsTimeTotal / 1000000;
if (CRAWL_LOG_ENABLED) {
$db->addCrawlerLog(time(),
$hostsAdded,
$hostPagesProcessed,
$hostPagesIndexed,
$hostPagesAdded,
$hostPagesSnapAdded,
$hostPagesBanned,
$manifestsProcessed,
$manifestsAdded,
$httpRequestsTotal,
$httpRequestsSizeTotal,
$httpDownloadSizeTotal,
$httpRequestsTimeTotal,
$executionTimeTotal);
}
// Debug output
echo 'Hosts added: ' . $hostsAdded . PHP_EOL;
echo 'Pages processed: ' . $hostPagesProcessed . PHP_EOL;
echo 'Pages indexed: ' . $hostPagesIndexed . PHP_EOL;
echo 'Pages added: ' . $hostPagesAdded . PHP_EOL;
echo 'Pages snaps added: ' . $hostPagesSnapAdded . PHP_EOL;
echo 'Pages banned: ' . $hostPagesBanned . PHP_EOL;
echo 'Manifests processed: ' . $manifestsProcessed . PHP_EOL;
echo 'Manifests added: ' . $manifestsAdded . PHP_EOL;
echo 'HTTP Requests total: ' . $httpRequestsTotal . PHP_EOL;
echo 'HTTP Requests total size: ' . $httpRequestsSizeTotal . PHP_EOL;
echo 'HTTP Download total size: ' . $httpDownloadSizeTotal . PHP_EOL;
echo 'HTTP Requests total time: ' . $httpRequestsTimeTotal . PHP_EOL;
echo 'Total time: ' . $executionTimeTotal . PHP_EOL . PHP_EOL;