From a40ed02b7066fcf78f32477c534cebb077c817f2 Mon Sep 17 00:00:00 2001
From: Brian Olore <brian@olore.net>
Date: Fri, 31 Aug 2018 20:35:19 -0400
Subject: [PATCH] version-checker: use cacache to only check for new versions
 once per 24 hours

---
 lib/utils/version-checker.js | 66 ++++++++++++++++++++++++------------
 1 file changed, 44 insertions(+), 22 deletions(-)

diff --git a/lib/utils/version-checker.js b/lib/utils/version-checker.js
index 39392fbf8e8a6..9ae7a0e0875b0 100644
--- a/lib/utils/version-checker.js
+++ b/lib/utils/version-checker.js
@@ -1,14 +1,16 @@
 const boxen = require('boxen')
+const cacache = require('cacache')
 const log = require('npmlog')
+const nopt = require('nopt')
+const path = require('path')
 const pacote = require('pacote')
 const semver = require('semver')
-var npmconf = require('../config/core.js')
-var configDefs = npmconf.defs
+
+const npm = require('../npm.js')
+const npmconf = require('../config/core.js')
+const configDefs = npmconf.defs
 const shorthands = configDefs.shorthands
 const types = configDefs.types
-const nopt = require('nopt')
-let npm = require('../npm.js')
-
 const pacoteOpts = require('../config/pacote')
 const unsupported = require('./unsupported.js')
 
@@ -25,23 +27,43 @@ exports.doCheck = function () {
 
   npm.load(conf, function (err) {
     if (err) return
-    if (
-      npm.config.get('update-notifier') &&
-      !isGlobalNpmUpdate &&
-      !unsupported.checkVersion(process.version).unsupported &&
-      !isCI
-    ) {
-      pacote.manifest('npm@latest', pacoteOpts())
-        .then((latest) => {
-          const oldVersion = require('../../package.json').version
-          let diffType = semver.diff(oldVersion, latest.version)
-          if (diffType) {
-            console.log(generateMessage(oldVersion, latest.version, diffType, npm))
-          } else {
-            log.silly('version-check', 'we are running the latest version of npm')
-          }
-        })
-    }
+
+    isBeyondCheckInterval().then((shouldCheck) => {
+      if (shouldCheck) {
+        if (
+          npm.config.get('update-notifier') &&
+          !isGlobalNpmUpdate &&
+          !unsupported.checkVersion(process.version).unsupported &&
+          !isCI
+        ) {
+          pacote.manifest('npm@latest', pacoteOpts())
+            .then((latest) => {
+              const oldVersion = require('../../package.json').version
+              let diffType = semver.diff(oldVersion, latest.version)
+              if (diffType) {
+                console.log(generateMessage(oldVersion, latest.version, diffType, npm))
+              } else {
+                log.silly('version-checker', 'we are running the latest version of npm')
+              }
+            })
+        }
+      }
+    })
+  })
+}
+
+function isBeyondCheckInterval () {
+  const cache = path.join(npm.config.get('cache'), '_cacache')
+  const ONE_DAY = 24 * 60 * 60 * 1000
+
+  return cacache.get(cache, 'update-notifier:last-check').then(cacheObj => {
+    const time = Number(cacheObj.data.toString('utf8'))
+    return (time + ONE_DAY) < Date.now()
+  }).catch((notFound) => {
+    const time = Number(Date.now()).toString()
+    return cacache.put(cache, 'update-notifier:last-check', time).then(() => {
+      return true
+    })
   })
 }