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<?php |
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/** |
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* Server-side cache for recommendation provider API |
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* |
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* Author: National Research Council Canada |
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* Website: http://www.nrc-cnrc.gc.ca/eng/rd/dt/ |
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* |
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* License: MIT |
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* Copyright: Her Majesty the Queen in Right of Canada, as represented by |
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* the Minister of National Research Council, 2019 |
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*/ |
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namespace NRC; |
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class ApiCache { |
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// Filename to store cache into |
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private $cacheFile = NULL; |
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// Location to store cache files |
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private $cacheFolder = '/tmp/nrc-api-cache/'; |
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// Number of seconds cache is valid |
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private $cacheExpires = 3600; |
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function __construct($signature) { |
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$this->cacheFolder = sys_get_temp_dir() . '/nrc-api-cache/'; |
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if (!file_exists($this->cacheFolder)) { |
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mkdir($this->cacheFolder); |
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} |
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$filename = base64_encode(json_encode($signature)); |
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$this->cacheFile = $this->cacheFolder . $filename; |
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} |
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public function get($cb) { |
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$cached = false; |
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if (file_exists($this->cacheFile)) { |
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$fp = fopen($this->cacheFile, 'r'); |
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$cacheTime = (int)fgets($fp); |
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if ($cacheTime < (time() + $this->cacheExpires)) { |
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$cached = true; |
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while (($buffer = fgets($fp)) !== false) { |
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yield $buffer; |
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} |
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} |
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fclose($fp); |
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} |
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if (!$cached) { |
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$fp = fopen($this->cacheFile, 'w'); |
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fwrite($fp, time() . "\n"); |
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$data = $cb(); |
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while ($data->valid()) { |
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$output = $data->current(); |
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fwrite($fp, $output . "\n"); |
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yield $output; |
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$data->next(); |
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} |
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fclose($fp); |
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} |
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} |
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} |
gctools-outilsgc /
gcconnex
