46 lines
1.4 KiB
JavaScript
46 lines
1.4 KiB
JavaScript
const cache = require('./cache');
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const fetchNpmPackageInfo = require('./fetchNpmPackageInfo');
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const notFound = '';
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function cleanPackageInfo(packageInfo) {
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return {
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versions: Object.keys(packageInfo.versions).reduce((memo, key) => {
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memo[key] = packageInfo.versions[key];
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return memo;
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}, {}),
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'dist-tags': packageInfo['dist-tags']
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};
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}
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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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const value = cache.get(key);
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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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value = cleanPackageInfo(value);
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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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module.exports = getNpmPackageInfo;
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