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<?php |
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namespace ShopifyClient\Resource; |
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use GuzzleHttp\Client; |
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use GuzzleHttp\Exception\RequestException; |
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use ShopifyClient\Exception\ClientException; |
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abstract class AbstractResource implements Resource |
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{ |
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const API_CALL_LIMIT_HEADER = 'http_x_shopify_shop_api_call_limit'; |
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/** |
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* @var Client |
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*/ |
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protected $httpClient; |
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/** |
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* @var int |
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*/ |
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private $rateLimit; |
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/** |
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* @var int |
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*/ |
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private $callsMade; |
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/** |
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* @var float |
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*/ |
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private $callCycle = 0.5; // avg. 2 calls a second |
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/** |
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* @var float |
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*/ |
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private $rateLimitThreshold = 0.8; |
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/** |
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* @var int |
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*/ |
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private $rateLimitReached = 0; |
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/** |
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* AbstractResource constructor. |
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* @param Client $client |
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*/ |
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public function __construct(Client $client) |
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{ |
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$this->httpClient = $client; |
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} |
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/** |
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* @param $method |
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* @param $endpoint |
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* @param array $params |
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* @return array |
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* @throws ClientException |
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*/ |
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public function request($method, $endpoint, $params = []) |
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{ |
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$this->handleRateLimit(); |
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try { |
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$response = $this->httpClient->request($method, $endpoint, $this->getRequestParameters($method, $params)); |
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} catch (RequestException $e) { |
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$response = $e->getResponse(); |
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$content = json_decode($response->getBody()->getContents(), true); |
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throw new ClientException($content['errors'], $response->getStatusCode()); |
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} |
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$this->setRateLimit($response->getHeader(self::API_CALL_LIMIT_HEADER)); |
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return json_decode($response->getBody()->getContents(), true); |
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} |
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/** |
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* @return int |
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*/ |
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public function getRateLimitReached(): int |
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{ |
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return $this->rateLimitReached; |
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} |
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/** |
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* @param string $method |
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* @param array $params |
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* @return array |
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*/ |
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private function getRequestParameters(string $method, array $params): array |
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{ |
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if ($method !== 'GET') { |
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$params['headers']['Content-Type'] = 'application/json'; |
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} |
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return $params; |
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} |
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private function handleRateLimit() |
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{ |
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if ($this->callsMade > 0 && $this->isRateLimitReached()) { |
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$this->rateLimitReached++; |
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// Prevent bucket overflow |
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// https://help.shopify.com/api/getting-started/api-call-limit |
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usleep(rand(3, 10) * 1000000); |
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} |
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} |
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/** |
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* With a "leak rate" of 2 calls per second that continually empties the bucket. |
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* If your app averages 2 calls per second, it will never trip a 429 error ("bucket overflow"). |
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* |
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* @param callable $function |
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* @return mixed |
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*/ |
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public function throttle(callable $function) |
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{ |
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$start = time(); |
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$result = $function(); |
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$end = time(); |
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$duration = $end - $start; |
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$waitTime = ceil($this->callCycle - $duration); |
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if ($waitTime > 0) { |
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sleep($waitTime); |
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} |
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return $result; |
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} |
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/** |
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* @param array $header |
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*/ |
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private function setRateLimit(array $header) |
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{ |
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$parts = explode('/', $header[0]); |
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$this->rateLimit = $parts[1]; |
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$this->callsMade = $parts[0]; |
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} |
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/** |
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* @return bool |
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*/ |
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58 |
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public function isRateLimitReached(): bool |
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{ |
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return $this->getCallLimit() >= $this->rateLimitThreshold; |
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} |
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public function getCallLimit() |
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{ |
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return $this->callsMade / $this->rateLimit; |
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} |
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} |
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Edwin-Luijten /
shopify-client
