WIP

Author: dumbbell

deps/rabbit/src/rabbit_auth_backend_internal.erl

@@ -300,7 +300,10 @@ delete_user(Username, ActingUser) ->
             rabbit_types:error('not_found').
 
 lookup_user(Username) ->
-    rabbit_db_user:get(Username).
+    case rabbit_db_user:get(Username) of
+        undefined -> {error, not_found};
+        User      -> {ok, User}
+    end.
 
 -spec exists(rabbit_types:username()) -> boolean().
 

deps/rabbit/src/rabbit_db_user.erl

@@ -109,7 +109,10 @@ get(Username) when is_binary(Username) ->
       #{mnesia => fun() -> get_in_mnesia(Username) end}).
 
 get_in_mnesia(Username) ->
-    rabbit_misc:dirty_read({rabbit_user, Username}).
+    case ets:lookup(?MNESIA_TABLE, Username) of
+        [User] -> User;
+        []     -> undefined
+    end.
 
 %% -------------------------------------------------------------------
 %% get_all().

deps/rabbit/src/rabbit_vhost.erl

@@ -506,7 +506,10 @@ default_name() ->
 
 -spec lookup(vhost:name()) -> vhost:vhost() | rabbit_types:ok_or_error(any()).
 lookup(VHostName) ->
-    rabbit_db_vhost:get(VHostName).
+    case rabbit_db_vhost:get(VHostName) of
+        undefined -> {error, {no_such_vhost, VHostName}};
+        VHost     -> VHost
+    end.
 
 -spec assert(vhost:name()) -> 'ok'.
 assert(VHostName) ->