improve error handling of sync with better errors

src/engine/classic.js

@@ -144,23 +144,24 @@ class Classic {
   }
 
   render(m) {
+    //if there's an error, we should show the error screen no matter what.
+    if (l.hasStopped(m)) {
+      return new ErrorScreen();
+    }
+
     // TODO: remove the detail about the loading pane being pinned,
     // sticky screens should be handled at the box module.
     if (!isDone(m) || m.get("isLoadingPanePinned")) {
       return new LoadingScreen();
     }
 
-    if (l.hasStopped(m)) {
-      return new ErrorScreen();
-    }
-
     if (hasScreen(m, "login")) {
       if (!hasSkippedQuickAuth(m)
-           && hasInitialScreen(m, "login")) {
+        && hasInitialScreen(m, "login")) {
 
-         if (isInCorpNetwork(m)) {
-           return new KerberosScreen();
-         }
+        if (isInCorpNetwork(m)) {
+          return new KerberosScreen();
+        }
 
         if (l.ui.rememberLastLogin(m)) {
           const conn = lastUsedConnection(m);

src/sync.js

@@ -116,7 +116,7 @@ function handleError(m, key, error) {
 
   // TODO: this should be configurable for each sync
   if (key !== "sso") {
-    const stopError = new Error(`An error occurred when fetching data. (key: ${key})`);
+    const stopError = new Error(`An error occurred when fetching ${key} data for Lock: ${error.message}`);
     stopError.code = "sync";
     stopError.origin = error;
     result = l.stop(result, stopError);

src/utils/cdn_utils.js

@@ -33,24 +33,24 @@ export function load(attrs) {
   script.src = url;
   global.document.getElementsByTagName('head')[0].appendChild(script);
 
-  const handleError = (url) => {
+  const handleError = (err) => {
     cbs[method] = cbs[method].filter(x => {
       if (x.url === url) {
-        setTimeout(() => x.cb({}), 0);
+        setTimeout(() => x.cb(err), 0);
         return false;
       } else {
         return true;
       }
     });
   }
 
-  const timeoutID = setTimeout(() => handleError(url), 5000);
+  const timeoutID = setTimeout(() => handleError(new Error(`${url} timed out`)), 20000);
 
   script.addEventListener('load', () => clearTimeout(timeoutID));
 
   script.addEventListener('error', () => {
     clearTimeout(timeoutID);
-    handleError(url);
+    handleError(new Error(`${url} could not be loaded.`));
   });
 }