Parse error message (prometheus#866)

* Parse error message

* Update bindata.go

ui/app/src/Utils/Api.elm

@@ -17,6 +17,11 @@ withDefault default response =
             default
 
 
+parseError : String -> Maybe String
+parseError =
+    Json.decodeString (field "error" Json.string) >> Result.toMaybe
+
+
 errorToString : Http.Error -> String
 errorToString err =
     case err of
@@ -27,11 +32,12 @@ errorToString err =
             "Network error"
 
         BadStatus resp ->
-            resp.status.message ++ " " ++ resp.body
+            parseError resp.body
+                |> Maybe.withDefault (resp.status.message ++ " " ++ resp.body)
 
         BadPayload err resp ->
             -- OK status, unexpected payload
-            "Unexpected response from api" ++ err
+            "Unexpected response from api: " ++ err
 
         BadUrl url ->
             "Malformed url: " ++ url

ui/app/src/Utils/Views.elm

@@ -4,6 +4,7 @@ import Html exposing (..)
 import Html.Attributes exposing (..)
 import Html.Events exposing (onCheck, onInput, onClick, onBlur)
 import Utils.FormValidation exposing (ValidationState(..), ValidatedField)
+import Utils.String
 
 
 tab : tab -> tab -> (tab -> msg) -> List (Html msg) -> Html msg
@@ -126,6 +127,5 @@ loading =
 
 error : String -> Html msg
 error err =
-    div []
-        [ p [] [ text <| "Error: " ++ err ]
-        ]
+    div [ class "alert alert-warning" ]
+        [ text (Utils.String.capitalizeFirst err) ]

ui/app/src/Views/SilenceForm/Views.elm

@@ -104,7 +104,7 @@ informationBlock silence alerts =
             Views.Shared.SilencePreview.view alerts
 
         Utils.Types.Failure error ->
-            div [ class "alert alert-warning" ] [ text error ]
+            Utils.Views.error error
 
         Utils.Types.Loading ->
             loading