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<?php |
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/** |
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* @package Currency |
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* @author Iurii Makukh <[email protected]> |
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* @copyright Copyright (c) 2015, Iurii Makukh |
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* @license https://www.gnu.org/licenses/gpl.html GNU/GPLv3 |
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*/ |
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namespace gplcart\modules\currency\models; |
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use Exception; |
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use gplcart\core\Logger; |
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use gplcart\core\models\Currency as CurrencyModel; |
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use gplcart\core\models\Http as HttpModel; |
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/** |
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* Methods to update currencies with data from Yahoo Finance feed |
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*/ |
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class Currency |
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{ |
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/** |
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* Yahoo API endpoint |
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*/ |
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const URL = 'https://query.yahooapis.com/v1/public/yql'; |
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/** |
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* Currency model class instance |
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* @var \gplcart\core\models\Currency $currency |
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*/ |
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protected $currency; |
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/** |
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* Logger class instance |
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* @var \gplcart\core\Logger $logger |
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*/ |
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protected $logger; |
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/** |
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* Http model instance |
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* @var \gplcart\core\models\Http $http |
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*/ |
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protected $http; |
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/** |
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* @param Logger $logger |
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* @param CurrencyModel $currency |
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* @param HttpModel $http |
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*/ |
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public function __construct(Logger $logger, CurrencyModel $currency, HttpModel $http) |
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{ |
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$this->logger = $logger; |
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$this->http = $http; |
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$this->currency = $currency; |
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} |
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/** |
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* Performs GET request to Yahoo API |
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* @param array $query |
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* @return array |
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*/ |
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public function request(array $query) |
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{ |
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try { |
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$response = $this->http->request(static::URL, array('query' => $query)); |
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$data = json_decode($response['data'], true); |
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} catch (Exception $ex) { |
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$this->logger->log('module_currency', $ex->getMessage(), 'warning'); |
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return array(); |
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} |
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if (empty($data['query']['results']['rate'])) { |
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$this->logger->log('module_currency', 'Failed to get currency rates from Yahoo Finance', 'warning'); |
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return array(); |
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} |
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return $data['query']['results']['rate']; |
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} |
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/** |
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* Updated store currencies |
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* @param array $settings |
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* @return array |
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*/ |
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public function update(array $settings) |
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{ |
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$codes = $this->getCandidates($settings); |
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if (empty($codes)) { |
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return array(); |
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} |
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$list = $this->currency->getList(); |
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$base = $this->currency->getDefault(); |
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$results = $this->request($this->buildQuery($codes)); |
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$updated = array(); |
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foreach ($results as $result) { |
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$code = preg_replace("/$base$/", '', $result['id']); |
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if ($code == $base || empty($list[$code]) || empty($result['Rate']) || $result['Rate'] == 0) { |
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continue; |
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} |
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if ($this->shouldUpdateRate($result['Rate'], $list[$code], $settings)) { |
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$rate = $this->prepareRate($result['Rate'], $settings); |
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$updated[$code] = $rate; |
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$this->currency->update($code, array('conversion_rate' => $rate)); |
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} |
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} |
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if (empty($updated)) { |
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return array(); |
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} |
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$log = array( |
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'message' => 'Updated the following currencies: @list', |
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'variables' => array('@list' => implode(',', array_keys($updated))) |
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); |
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$this->logger->log('module_currency', $log); |
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return $updated; |
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} |
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/** |
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* Prepares rate value before updating |
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* @param float $rate |
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* @param array $settings |
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* @return float |
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*/ |
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protected function prepareRate($rate, array $settings) |
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{ |
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if (!empty($settings['correction'])) { |
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$rate *= (1 + (float) $settings['correction'] / 100); |
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} |
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return $rate; |
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} |
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/** |
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* Whether the currency should be updated |
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* @param float $value |
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* @param array $currency |
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* @param array $settings |
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* @return bool |
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*/ |
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protected function shouldUpdateRate($value, $currency, array $settings) |
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{ |
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if (!empty($settings['update'])) { |
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return true; |
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} |
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list($min_max, $min_min, $max_min, $max_max) = $settings['derivation']; |
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$diff = (1 - ($currency['conversion_rate'] / $value)) * 100; |
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$diffabs = abs($diff); |
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if ($diff > 0) { |
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return ($max_min <= $diffabs) && ($diffabs <= $max_max); |
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} |
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if ($diff < 0) { |
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return ($min_min <= $diffabs) && ($diffabs <= $min_max); |
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} |
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return false; |
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} |
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/** |
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* Returns an array of currency codes to be updated |
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* @param array $settings |
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* @return array |
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*/ |
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public function getCandidates(array $settings) |
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{ |
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$list = $this->currency->getList(); |
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if (!empty($settings['currencies'])) { |
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$list = array_intersect_key(array_flip($settings['currencies']), $list); |
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} |
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foreach ($list as $code => $currency) { |
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if (!empty($currency['default']) || empty($currency['status'])) { |
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unset($list[$code]); |
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continue; |
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} |
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if (!empty($settings['update'])) { |
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continue; // Force updating |
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} |
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if (!empty($settings['interval']) && (GC_TIME - $currency['modified']) < (int) $settings['interval']) { |
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unset($list[$code]); |
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} |
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} |
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return array_keys($list); |
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} |
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/** |
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* Returns an array of query data |
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* @param array $codes |
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* @return array |
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*/ |
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protected function buildQuery(array $codes) |
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{ |
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$base = $this->currency->getDefault(); |
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array_walk($codes, function (&$code) use ($base) { |
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$code = "\"$code$base\""; |
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}); |
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$list = implode(',', $codes); |
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return array( |
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'format' => 'json', |
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'env' => 'store://datatables.org/alltableswithkeys', |
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'q' => "select * from yahoo.finance.xchange where pair in($list)" |
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); |
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} |
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} |
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gplcart /
currency
