Add functionality for refetching latest data after computer wakes up (#5120)

webapp/actions/websocket_actions.jsx

@@ -67,9 +67,15 @@ export function close() {
     WebSocketClient.close();
 }
 
-export function reconnect() {
+function reconnectWebSocket() {
     close();
     initialize();
+}
+
+export function reconnect(includeWebSocket = true) {
+    if (includeWebSocket) {
+        reconnectWebSocket();
+    }
 
     if (Client.teamId) {
         loadChannelsForCurrentUser();

webapp/routes/route_team.jsx

@@ -8,6 +8,7 @@ import {browserHistory} from 'react-router/es6';
 import TeamStore from 'stores/team_store.jsx';
 import * as GlobalActions from 'actions/global_actions.jsx';
 import {loadStatusesForChannelAndSidebar} from 'actions/status_actions.jsx';
+import {reconnect} from 'actions/websocket_actions.jsx';
 import AppDispatcher from 'dispatcher/app_dispatcher.jsx';
 import Constants from 'utils/constants.jsx';
 const ActionTypes = Constants.ActionTypes;
@@ -60,12 +61,28 @@ function doChannelChange(state, replace, callback) {
     callback();
 }
 
+let wakeUpInterval;
+let lastTime = (new Date()).getTime();
+const WAKEUP_CHECK_INTERVAL = 30000; // 30 seconds
+const WAKEUP_THRESHOLD = 60000; // 60 seconds
+
 function preNeedsTeam(nextState, replace, callback) {
     if (RouteUtils.checkIfMFARequired(nextState)) {
         browserHistory.push('/mfa/setup');
         return;
     }
 
+    clearInterval(wakeUpInterval);
+
+    wakeUpInterval = setInterval(() => {
+        const currentTime = (new Date()).getTime();
+        if (currentTime > (lastTime + WAKEUP_THRESHOLD)) {  // ignore small delays
+            console.log('computer woke up - fetching latest'); //eslint-disable-line no-console
+            reconnect(false);
+        }
+        lastTime = currentTime;
+    }, WAKEUP_CHECK_INTERVAL);
+
     // First check to make sure you're in the current team
     // for the current url.
     const teamName = nextState.params.team;