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<?php |
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namespace vipnytt\RobotsTxtParser\Client\SQL\Delay; |
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use PDO; |
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use vipnytt\RobotsTxtParser\Client\SQL\SQLInterface; |
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use vipnytt\RobotsTxtParser\Client\SQL\SQLTrait; |
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use vipnytt\RobotsTxtParser\Parser\UrlParser; |
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/** |
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* Class DelayHandlerSQL |
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* |
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* @package vipnytt\RobotsTxtParser\Delay\SQL |
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*/ |
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class DelayHandlerSQL implements SQLInterface |
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{ |
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use SQLTrait; |
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use UrlParser; |
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/** |
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* @var PDO |
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*/ |
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private $pdo; |
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/** |
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* PDO driver |
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* @var string |
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*/ |
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private $driver; |
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/** |
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* Base URI |
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* @var string |
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*/ |
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private $base; |
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/** |
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* User-agent |
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* @var string |
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*/ |
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private $userAgent; |
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/** |
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* Delay |
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* @var float|int |
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*/ |
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private $delay; |
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/** |
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* Delay constructor. |
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* |
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* @param PDO $pdo |
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* @param string $baseUri |
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* @param string $userAgent |
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* @param float|int $delay |
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*/ |
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public function __construct(PDO $pdo, $baseUri, $userAgent, $delay) |
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{ |
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$this->pdo = $this->pdoInitialize($pdo); |
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$this->driver = $this->pdo->getAttribute(PDO::ATTR_DRIVER_NAME); |
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if ($this->driver != 'mysql') { |
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trigger_error('Unsupported database. Currently only MySQL 5.6+ are officially supported. ' . self::README_SQL_DELAY, E_USER_WARNING); |
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} |
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$this->base = $this->urlBase($this->urlEncode($baseUri)); |
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$this->userAgent = $userAgent; |
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$this->delay = $delay; |
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} |
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/** |
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* Sleep |
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* |
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* @return float|int |
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*/ |
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public function sleep() |
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{ |
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$start = microtime(true); |
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$until = $this->getMicroTime(); |
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if (microtime(true) > $until) { |
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return 0; |
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} |
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try { |
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time_sleep_until($until); |
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} catch (\Exception $warning) { |
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// Timestamp already in the past |
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} |
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return microtime(true) - $start; |
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} |
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/** |
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* Timestamp with milliseconds |
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* |
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* @return float|int|false |
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*/ |
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public function getMicroTime() |
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{ |
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$this->increment(); |
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$query = $this->pdo->prepare(<<<SQL |
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SELECT microTime |
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FROM robotstxt__delay0 |
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WHERE base = :base AND userAgent = :userAgent; |
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SQL |
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); |
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$query->bindParam(':base', $this->base, PDO::PARAM_STR); |
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$query->bindParam(':userAgent', $this->userAgent, PDO::PARAM_STR); |
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$query->execute(); |
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if ($query->rowCount() > 0) { |
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$row = $query->fetch(PDO::FETCH_ASSOC); |
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return $row['microTime'] / 1000000; |
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} |
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return 0; |
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} |
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/** |
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* Set new delayUntil timestamp |
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* |
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* @return bool |
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*/ |
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private function increment() |
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{ |
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$query = $this->pdo->prepare(<<<SQL |
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INSERT INTO robotstxt__delay0 (base, userAgent, microTime) |
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VALUES (:base, :userAgent, microTime + :delay) |
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ON DUPLICATE KEY UPDATE |
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microTime = GREATEST((UNIX_TIMESTAMP(CURTIME(6)) + :delay) * 1000000, microTime + (:delay * 1000000)); |
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SQL |
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); |
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$query->bindParam(':base', $this->base, PDO::PARAM_STR); |
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$query->bindParam(':userAgent', $this->userAgent, PDO::PARAM_STR); |
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$query->bindParam(':delay', $this->delay, PDO::PARAM_INT); |
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return $query->execute(); |
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} |
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} |
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VIPnytt /
RobotsTxtParser
