ErrorHandling: Fixes issues with bad error messages (#63775)

packages/grafana-runtime/src/services/backendSrv.ts

@@ -118,6 +118,7 @@ export interface FetchError<T = any> {
   status: number;
   statusText?: string;
   data: T;
+  message?: string;
   cancelled?: boolean;
   isHandled?: boolean;
   config: BackendSrvRequest;

pkg/api/login.go

@@ -24,6 +24,7 @@ import (
 	"github.com/grafana/grafana/pkg/services/secrets"
 	"github.com/grafana/grafana/pkg/services/user"
 	"github.com/grafana/grafana/pkg/setting"
+	"github.com/grafana/grafana/pkg/util"
 	"github.com/grafana/grafana/pkg/web"
 )
 
@@ -190,7 +191,7 @@ func (hs *HTTPServer) tryAutoLogin(c *contextmodel.ReqContext) bool {
 
 func (hs *HTTPServer) LoginAPIPing(c *contextmodel.ReqContext) response.Response {
 	if c.IsSignedIn || c.IsAnonymous {
-		return response.JSON(http.StatusOK, "Logged in")
+		return response.JSON(http.StatusOK, util.DynMap{"message": "Logged in"})
 	}
 
 	return response.Error(401, "Unauthorized", nil)

public/app/core/services/backend_srv.ts

@@ -317,6 +317,11 @@ export class BackendSrv implements BackendService {
     let description = '';
     let message = err.data.message;
 
+    // Sometimes we have a better error message on err.message
+    if (message === 'Unexpected error' && err.message) {
+      message = err.message;
+    }
+
     if (message.length > 80) {
       description = message;
       message = 'Error';

public/app/core/specs/backend_srv.test.ts

@@ -275,6 +275,26 @@ describe('backendSrv', () => {
             'bogus-trace-id',
           ]);
         });
+
+        it('It should favor error.message for fetch errors when error.data.message is Unexpected error', async () => {
+          const { backendSrv, appEventsMock } = getTestContext({});
+          backendSrv.showErrorAlert(
+            {
+              url: 'api/do/something',
+            } as BackendSrvRequest,
+            {
+              data: {
+                message: 'Unexpected error',
+              },
+              message: 'Failed to fetch',
+              status: 500,
+              config: {
+                url: '',
+              },
+            } as FetchError
+          );
+          expect(appEventsMock.emit).toHaveBeenCalledWith(AppEvents.alertError, ['Failed to fetch', '']);
+        });
       });
     });
 

public/app/core/utils/errors.ts

@@ -1,10 +1,12 @@
 import { isFetchError } from '@grafana/runtime';
 
 export function getMessageFromError(err: unknown): string {
-  if (err) {
   if (typeof err === 'string') {
     return err;
-    } else if (err instanceof Error) {
+  }
+
+  if (err) {
+    if (err instanceof Error) {
       return err.message;
     } else if (isFetchError(err)) {
       if (err.data && err.data.message) {
@@ -14,5 +16,6 @@ export function getMessageFromError(err: unknown): string {
       }
     }
   }
+
   return JSON.stringify(err);
 }