Merge pull request #388 from rabbitmq/md-handle-shutdown-genstatem-call

Handle shutdown exits in gen_statem:call/3

Author: michaelklishin

src/ra.hrl

@@ -65,7 +65,7 @@
 
 -type consistent_query_ref() :: {From :: term(), Query :: ra:query_fun(), ConmmitIndex :: ra_index()}.
 
--type safe_call_ret(T) :: timeout | {error, noproc | nodedown} | T.
+-type safe_call_ret(T) :: timeout | {error, noproc | nodedown | shutdown} | T.
 
 -type states() :: leader | follower | candidate | await_condition.
 

src/ra_server_proc.erl

@@ -1499,7 +1499,9 @@ gen_statem_safe_call(ServerId, Msg, Timeout) ->
          exit:{noproc, _} ->
             {error, noproc};
          exit:{{nodedown, _}, _} ->
-            {error, nodedown}
+            {error, nodedown};
+         exit:{shutdown, _} ->
+            {error, shutdown}
     end.
 
 do_state_query(all, State) -> State;