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<?php |
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namespace vipnytt\RobotsTxtParser\Client\Delay\MySQL; |
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use PDO; |
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use vipnytt\RobotsTxtParser\Client\Delay\ClientInterface; |
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use vipnytt\RobotsTxtParser\Exceptions\SQLException; |
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use vipnytt\UserAgentParser; |
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/** |
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* Class Client |
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* |
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* @see https://github.com/VIPnytt/RobotsTxtParser/blob/master/docs/methods/DelayClient.md for documentation |
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* @package vipnytt\RobotsTxtParser\Client\Delay\MySQL |
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*/ |
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class Client implements ClientInterface |
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{ |
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/** |
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* Database handler |
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* @var PDO |
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*/ |
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private $pdo; |
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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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* Client 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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* @throws SQLException |
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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 = $pdo; |
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$this->base = $baseUri; |
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$uaStringParser = new UserAgentParser($userAgent); |
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$this->userAgent = $uaStringParser->stripVersion(); |
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$this->delay = round($delay, 6, PHP_ROUND_HALF_UP); |
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} |
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/** |
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* Queue |
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* |
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* @return float|int |
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*/ |
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public function getQueue() |
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{ |
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if ($this->delay == 0) { |
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return 0; |
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} |
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$query = $this->pdo->prepare(<<<SQL |
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SELECT GREATEST(0, (delayUntil / 1000000) - UNIX_TIMESTAMP(CURTIME(6))) AS sec |
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FROM robotstxt__delay0 |
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WHERE base = :base AND userAgent = :userAgent; |
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SQL |
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); |
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$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 $row['sec']; |
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} |
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return 0; |
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} |
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/** |
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* Reset queue |
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* |
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* @return bool |
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*/ |
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public function reset() |
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{ |
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$query = $this->pdo->prepare(<<<SQL |
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DELETE FROM robotstxt__delay0 |
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WHERE base = :base AND userAgent = :useragent; |
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SQL |
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); |
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$query->bindParam(':base', $this->base, PDO::PARAM_INT); |
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$query->bindParam(':useragent', $this->userAgent, PDO::PARAM_INT); |
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return $query->execute(); |
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} |
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/** |
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* Sleep |
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* |
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* @return float|int |
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*/ |
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public function sleep() |
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{ |
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$start = microtime(true); |
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$until = $this->getTimeSleepUntil(); |
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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) - $start; |
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} |
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/** |
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* Timestamp with milliseconds |
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* |
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* @return float|int |
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* @throws SQLException |
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*/ |
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public function getTimeSleepUntil() |
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{ |
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if ($this->delay == 0) { |
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return 0; |
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} |
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$query = $this->pdo->prepare(<<<SQL |
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SELECT |
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delayUntil, |
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UNIX_TIMESTAMP() |
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FROM robotstxt__delay0 |
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WHERE base = :base AND userAgent = :userAgent; |
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SQL |
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); |
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$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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$this->increment(); |
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if ($query->rowCount() > 0) { |
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$row = $query->fetch(PDO::FETCH_ASSOC); |
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if (abs(time() - $row['UNIX_TIMESTAMP()']) > 10) { |
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throw new SQLException('`PHP server` and `SQL server` timestamps are out of sync. Please fix!'); |
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} |
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return $row['delayUntil'] / 1000000; |
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} |
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return 0; |
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} |
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/** |
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* Set new delayUntil timestamp |
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* |
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* @return bool |
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*/ |
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private function increment() |
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{ |
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$query = $this->pdo->prepare(<<<SQL |
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INSERT INTO robotstxt__delay0 (base, userAgent, delayUntil, lastDelay) |
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VALUES (:base, :userAgent, (UNIX_TIMESTAMP(CURTIME(6)) + :delay) * 1000000, :delay * 1000000) |
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ON DUPLICATE KEY UPDATE |
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delayUntil = GREATEST((UNIX_TIMESTAMP(CURTIME(6)) + :delay) * 1000000, delayUntil + (:delay * 1000000)), |
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lastDelay = :delay * 1000000; |
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SQL |
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); |
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$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', $this->delay, is_int($this->delay) ? PDO::PARAM_INT : PDO::PARAM_STR); |
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return $query->execute(); |
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} |
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} |
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VIPnytt /
RobotsTxtParser
