Experimental port to Firebase hosting

modules/utils/getNpmPackageInfo.js

@@ -1,19 +1,21 @@
-const cache = require('./cache');
-const fetchNpmPackageInfo = require('./fetchNpmPackageInfo');
+import LRUCache from 'lru-cache';
+
+import fetchNpmPackageInfo from './fetchNpmPackageInfo';
+
+const maxMegabytes = 40; // Cap the cache at 40 MB
+const maxLength = maxMegabytes * 1024 * 1024;
+const oneSecond = 1000;
+const oneMinute = 60 * oneSecond;
+
+const cache = new LRUCache({
+  max: maxLength,
+  maxAge: oneMinute,
+  length: Buffer.byteLength
+});
 
 const notFound = '';
 
-function cleanPackageInfo(packageInfo) {
-  return {
-    versions: Object.keys(packageInfo.versions).reduce((memo, key) => {
-      memo[key] = packageInfo.versions[key];
-      return memo;
-    }, {}),
-    'dist-tags': packageInfo['dist-tags']
-  };
-}
-
-function getNpmPackageInfo(packageName) {
+export default function getNpmPackageInfo(packageName) {
   return new Promise((resolve, reject) => {
     const key = `npmPackageInfo-${packageName}`;
     const value = cache.get(key);
@@ -21,25 +23,21 @@ function getNpmPackageInfo(packageName) {
     if (value != null) {
       resolve(value === notFound ? null : JSON.parse(value));
     } else {
-      fetchNpmPackageInfo(packageName).then(value => {
-        if (value == null) {
+      fetchNpmPackageInfo(packageName).then(info => {
+        if (info == null) {
           // Cache 404s for 5 minutes. This prevents us from making
           // unnecessary requests to the registry for bad package names.
           // In the worst case, a brand new package's info will be
           // available within 5 minutes.
-          cache.setex(key, 300, notFound);
+          cache.set(key, notFound, oneMinute * 5);
           resolve(null);
         } else {
-          value = cleanPackageInfo(value);
-
           // Cache valid package info for 1 minute. In the worst case,
           // new versions won't be available for 1 minute.
-          cache.setex(key, 60, JSON.stringify(value));
-          resolve(value);
+          cache.set(key, JSON.stringify(info), oneMinute);
+          resolve(info);
         }
       }, reject);
     }
   });
 }
-
-module.exports = getNpmPackageInfo;