Update:Show version number in bottom of siderail #660 and save previous version data to continue showing if update is available

client/store/index.js

@@ -1,4 +1,4 @@
-import { checkForUpdate } from '@/plugins/version'
+import { checkForUpdate, currentVersion } from '@/plugins/version'
 import Vue from 'vue'
 
 export const state = () => ({
@@ -65,15 +65,44 @@ export const actions = {
     })
   },
   checkForUpdate({ commit }) {
-    return checkForUpdate()
-      .then((res) => {
-        commit('setVersionData', res)
-        return res
-      })
-      .catch((error) => {
-        console.error('Update check failed', error)
-        return false
-      })
+    const VERSION_CHECK_BUFF = 1000 * 60 * 5 // 5 minutes
+    var lastVerCheck = localStorage.getItem('lastVerCheck') || 0
+    var savedVersionData = localStorage.getItem('versionData')
+    if (savedVersionData) {
+      try {
+        savedVersionData = JSON.parse(localStorage.getItem('versionData'))
+      } catch (error) {
+        console.error('Failed to parse version data', error)
+        savedVersionData = null
+        localStorage.removeItem('versionData')
+      }
+    }
+
+    var shouldCheckForUpdate = Date.now() - Number(lastVerCheck) > VERSION_CHECK_BUFF
+    if (!shouldCheckForUpdate && savedVersionData && savedVersionData.version !== currentVersion) {
+      // Version mismatch between saved data so check for update anyway
+      shouldCheckForUpdate = true
+    }
+
+    if (shouldCheckForUpdate) {
+      return checkForUpdate()
+        .then((res) => {
+          if (res) {
+            localStorage.setItem('lastVerCheck', Date.now())
+            localStorage.setItem('versionData', JSON.stringify(res))
+
+            commit('setVersionData', res)
+          }
+          return res && res.hasUpdate
+        })
+        .catch((error) => {
+          console.error('Update check failed', error)
+          return false
+        })
+    } else if (savedVersionData) {
+      commit('setVersionData', savedVersionData)
+    }
+    return null
   }
 }