Chore: make populateSettings middleware use node-cache

lib/middlewares/populateSettings.js

@@ -1,9 +1,8 @@
 const state = require('./state')
-const settingsCache = require('./settingsCache')
 const newSettingsLoader = require('../new-settings-loader')
 const helpers = require('../route-helpers')
 
-const SETTINGS_CACHE_REFRESH = 60 * 60 * 1000
+const { settingsCache } = state
 
 const populateSettings = function (req, res, next) {
   const operatorId = res.locals.operatorId
@@ -13,21 +12,16 @@ const populateSettings = function (req, res, next) {
   }
 
   try {
-    // Clear cache every hour
-    if (Date.now() - settingsCache.getTimestamp(operatorId) > SETTINGS_CACHE_REFRESH) {
-      settingsCache.clear(operatorId)
-    }
-
-    if (!versionId && settingsCache.getCache(operatorId)) {
-      req.settings = settingsCache.getCache(operatorId)
+    const operatorSettings = settingsCache.get(operatorId)
+    if (!versionId && operatorSettings) {
+      req.settings = operatorSettings
       return next()
     }
 
-    if (!versionId && !settingsCache.getCache(operatorId)) {
+    if (!versionId && !operatorSettings) {
       return newSettingsLoader.loadLatest()
         .then(settings => {
-          settingsCache.setCache(operatorId, settings)
-          settingsCache.setTimestamp(operatorId, Date.now())
+          settingsCache.set(operatorId, settings)
           req.settings = settings
         })
         .then(() => next())

lib/middlewares/settingsCache.js

@@ -1,32 +0,0 @@
-const _ = require('lodash/fp')
-const state = require('./state')
-
-const getTimestamp = (operatorId) => {
-  if (!operatorId) throw new Error('operatorId must not be nil or empty')
-  return state.settingsCache[operatorId] ? state.settingsCache[operatorId].timestamp : null
-}
-
-const getCache = (operatorId) => {
-  if (!operatorId) throw new Error('operatorId must not be nil or empty')
-  return state.settingsCache[operatorId] ? state.settingsCache[operatorId].cache : null
-}
-
-const setTimestamp = (operatorId, newTimestamp) => {
-  state.settingsCache = _.set([operatorId, 'timestamp'], newTimestamp, state.settingsCache)
-}
-
-const setCache = (operatorId, newCache) => {
-  state.settingsCache = _.set([operatorId, 'cache'], newCache, state.settingsCache)
-}
-
-const clear = (operatorId) => {
-  state.settingsCache = _.set([operatorId], null, state.settingsCache)
-}
-
-module.exports = {
-  getTimestamp,
-  getCache,
-  setTimestamp,
-  setCache,
-  clear
-}

lib/middlewares/state.js

@@ -1,7 +1,13 @@
+const NodeCache = require('node-cache')
+const SETTINGS_CACHE_REFRESH = 3600
+
 module.exports = (function () {
   return {
     oldVersionId: 'unset',
-    settingsCache: {},
+    settingsCache: new NodeCache({
+      stdTTL: SETTINGS_CACHE_REFRESH,
+      checkperiod: SETTINGS_CACHE_REFRESH // Clear cache every hour
+    }),
     canLogClockSkewMap: {},
     canGetLastSeenMap: {},
     pids: {},

package-lock.json

@@ -12475,6 +12475,21 @@
       "resolved": "https://registry.npmjs.org/node-addon-api/-/node-addon-api-2.0.2.tgz",
       "integrity": "sha512-Ntyt4AIXyaLIuMHF6IOoTakB3K+RWxwtsHNRxllEoA6vPwP9o4866g6YWDLUdnucilZhmkxiHwHr11gAENw+QA=="
     },
+    "node-cache": {
+      "version": "5.1.2",
+      "resolved": "https://registry.npmjs.org/node-cache/-/node-cache-5.1.2.tgz",
+      "integrity": "sha512-t1QzWwnk4sjLWaQAS8CHgOJ+RAfmHpxFWmc36IWTiWHQfs0w5JDMBS1b1ZxQteo0vVVuWJvIUKHDkkeK7vIGCg==",
+      "requires": {
+        "clone": "2.x"
+      },
+      "dependencies": {
+        "clone": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/clone/-/clone-2.1.2.tgz",
+          "integrity": "sha1-G39Ln1kfHo+DZwQBYANFoCiHQ18="
+        }
+      }
+    },
     "node-expat": {
       "version": "2.3.18",
       "resolved": "https://registry.npmjs.org/node-expat/-/node-expat-2.3.18.tgz",

package.json

@@ -60,6 +60,7 @@
     "nano-markdown": "^1.2.0",
     "ndjson": "^1.5.0",
     "nocache": "^2.1.0",
+    "node-cache": "^5.1.2",
     "numeral": "^2.0.3",
     "otplib": "^12.0.1",
     "p-each-series": "^1.0.0",