38 lines
1.3 KiB
JavaScript
38 lines
1.3 KiB
JavaScript
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var imageSizeCache = {},
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size = require('./image-size-from-url'),
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Promise = require('bluebird'),
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getImageSizeFromUrl = size.getImageSizeFromUrl;
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/**
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* Get cached image size from URL
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* Always returns {object} imageSizeCache
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* @param {string} url
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* @returns {Promise<Object>} imageSizeCache
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* @description Takes a url and returns image width and height from cache if available.
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* If not in cache, `getImageSizeFromUrl` is called and returns the dimensions in a Promise.
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*/
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function getCachedImageSizeFromUrl(url) {
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if (!url || url === undefined || url === null) {
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return;
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}
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// image size is not in cache
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if (!imageSizeCache[url]) {
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return getImageSizeFromUrl(url).then(function (res) {
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imageSizeCache[url] = res;
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return Promise.resolve(imageSizeCache[url]);
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}).catch(function () {
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// @ToDo: add real error handling here as soon as we have error logging
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// logger.error({err:err});
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// in case of error we just attach the url
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return Promise.resolve(imageSizeCache[url] = url);
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});
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}
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// returns image size from cache
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return Promise.resolve(imageSizeCache[url]);
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}
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module.exports = getCachedImageSizeFromUrl;
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