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by BENOIT
01:22
created

ThrottleMiddleware::processConfiguration()   B

Complexity

Conditions 4
Paths 6

Size

Total Lines 22
Code Lines 15

Duplication

Lines 0
Ratio 0 %

Importance

Changes 0
Metric Value
dl 0
loc 22
rs 8.9197
c 0
b 0
f 0
cc 4
eloc 15
nc 6
nop 1
1
<?php
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namespace BenTools\GuzzleHttp\Middleware;
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use BenTools\GuzzleHttp\Middleware\Storage\Adapter\ArrayAdapter;
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use BenTools\GuzzleHttp\Middleware\Storage\Counter;
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use BenTools\GuzzleHttp\Middleware\Storage\ThrottleStorageInterface;
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use Psr\Http\Message\RequestInterface;
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class ThrottleMiddleware
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{
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    /**
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     * @var ThrottleConfiguration[]
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     */
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    private $configurations = [];
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    /**
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     * @var ThrottleStorageInterface
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     */
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    private $storage;
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    /**
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     * ThrottleMiddleware constructor.
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     * @param ThrottleStorageInterface $storage
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     */
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    public function __construct(ThrottleStorageInterface $storage = null)
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    {
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        $this->storage = $storage ?? new ArrayAdapter();
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    }
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    /**
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     * @param ThrottleConfiguration $configuration
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     */
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    public function registerConfiguration(ThrottleConfiguration $configuration)
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    {
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        $this->configurations[$configuration->getStorageKey()] = $configuration;
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    }
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    public function __invoke(callable $handler)
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    {
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        return function (RequestInterface $request, array $options) use ($handler) {
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            foreach ($this->configurations as $configuration) {
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                if ($configuration->matchRequest($request)) {
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                    $this->processConfiguration($configuration);
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                    break;
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                }
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            }
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            return $handler($request, $options);
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        };
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    }
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    private function processConfiguration(ThrottleConfiguration $configuration)
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    {
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        try {
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            $counter = $this->storage->getCounter($configuration->getStorageKey());
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        } catch (\TypeError $e) {
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            $counter = new Counter($configuration->getDuration());
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        }
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        if (!$counter->isExpired()) {
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            if ($counter->count() >= $configuration->getMaxRequests()) {
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                $microDuration = $configuration->getDuration() * 1000000;
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                usleep(random_int(min(50000, $microDuration), ($microDuration))); // Add some randomness to help shared storage
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                $this->processConfiguration($configuration);
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                return;
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            }
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        } else {
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            $counter->reset();
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        }
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        $counter->increment();
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        $this->storage->saveCounter($configuration->getStorageKey(), $counter, $configuration->getDuration());
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    }
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}
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