37 lines
1.2 KiB
JavaScript
37 lines
1.2 KiB
JavaScript
const cache = require('./cache');
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const fetchNpmPackageInfo = require('./fetchNpmPackageInfo');
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const notFound = 0;
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function getNpmPackageInfo(packageName) {
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return new Promise((resolve, reject) => {
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const key = `npmPackageInfo-${packageName}`;
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cache.get(key, (error, value) => {
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if (error) {
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reject(error);
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} else if (value != null) {
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resolve(value === notFound ? null : JSON.parse(value));
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} else {
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fetchNpmPackageInfo(packageName).then(value => {
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if (value == null) {
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// Cache 404s for 5 minutes. This prevents us from making
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// unnecessary requests to the registry for bad package names.
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// In the worst case, a brand new package's info will be
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// available within 5 minutes.
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cache.setex(key, 300, notFound);
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resolve(null);
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} else {
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// Cache valid package info for 1 minute. In the worst case,
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// new versions won't be available for 1 minute.
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cache.setex(key, 60, JSON.stringify(value));
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resolve(value);
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}
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}, reject);
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}
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});
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});
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}
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module.exports = getNpmPackageInfo;
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