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<?php |
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/* |
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* This file is part of the API Platform project. |
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* |
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* (c) Kévin Dunglas <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace ApiPlatform\Core\HttpCache; |
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use GuzzleHttp\ClientInterface; |
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/** |
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* Purges Varnish. |
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* |
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* @author Kévin Dunglas <[email protected]> |
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* |
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* @experimental |
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*/ |
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final class VarnishPurger implements PurgerInterface |
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{ |
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private $maxHeaderLength; |
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private $clients; |
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/** |
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* @param ClientInterface[] $clients |
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* @param int $maxHeaderLength |
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*/ |
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public function __construct(array $clients, $maxHeaderLength = 7500) |
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{ |
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$this->clients = $clients; |
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$this->maxHeaderLength = $maxHeaderLength; |
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} |
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/** |
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* Calculate how many tags fit into the header. |
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* |
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* This assumes that the tags are separated by one character. |
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* |
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* From https://github.com/FriendsOfSymfony/FOSHttpCache/blob/2.8.0/src/ProxyClient/HttpProxyClient.php#L137 |
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* |
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* @param string[] $escapedTags |
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* @param string $glue The concatenation string to use |
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* |
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* @return int Number of tags per tag invalidation request |
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*/ |
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private function determineTagsPerHeader($escapedTags, $glue) |
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{ |
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if (mb_strlen(implode($glue, $escapedTags)) < $this->maxHeaderLength) { |
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return \count($escapedTags); |
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} |
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/* |
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* estimate the amount of tags to invalidate by dividing the max |
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* header length by the largest tag (minus the glue length) |
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*/ |
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$tagsize = max(array_map('mb_strlen', $escapedTags)); |
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return (int) floor($this->maxHeaderLength / ($tagsize + \strlen($glue))) ?: 1; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function purge(array $iris) |
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{ |
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if (!$iris) { |
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return; |
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} |
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$chunkSize = $this->determineTagsPerHeader($iris, '|'); |
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$irisChunks = array_chunk($iris, $chunkSize); |
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foreach ($irisChunks as $irisChunk) { |
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$this->purgeRequest($irisChunk); |
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} |
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} |
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private function purgeRequest(array $iris) |
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{ |
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// Create the regex to purge all tags in just one request |
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$parts = array_map(function ($iri) { |
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return sprintf('(^|\,)%s($|\,)', preg_quote($iri)); |
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}, $iris); |
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$regex = \count($parts) > 1 ? sprintf('(%s)', implode(')|(', $parts)) : array_shift($parts); |
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foreach ($this->clients as $client) { |
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$client->request('BAN', '', ['headers' => ['ApiPlatform-Ban-Regex' => $regex]]); |
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} |
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} |
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} |
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api-platform /
core
This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent.
Consider making the comparison explicit by using
empty(..)or! empty(...)instead.