Handle empty nonces (zx vsn 0.4.5)

src/gmhc_server.erl

@@ -107,13 +107,16 @@ handle_cast({from_pool, #{via := Connector,
     %% We could check whether we have already received the candidate ...
     %% For now, stop all workers, restart with new candidate
     try
-        % Most of the time we don't want to stop the worker. If we do, though, then
-        % we need to do it more carefully than this, or memory usage will triple.
-        % Workers1 = stop_workers(Workers),
-        {Workers2, Cand1} = assign_nonces(Workers, Cand),
-        #st{candidate = Cand2} = S1 = maybe_request_nonces(S#st{candidate = Cand1}),
-        NewWorkers = [spawn_worker(W, Cand2) || W <- Workers2],
-        {noreply, S1#st{workers = NewWorkers}}
+        %% Most of the time we don't want to stop the worker. If we do, though, then
+        %% we need to do it more carefully than this, or memory usage will triple.
+        %% Workers1 = stop_workers(Workers),
+        %%
+        %% Nonces may be [], in which case we need to request new nonces first.
+        #st{candidate = Cand1} = S1 = maybe_request_nonces(S#st{candidate = Cand}),
+        {Workers2, Cand2} = assign_nonces(Workers, Cand1),
+        #st{candidate = Cand3} = S2 = maybe_request_nonces(S1#st{candidate = Cand2}),
+        NewWorkers = [spawn_worker(W, Cand3) || W <- Workers2],
+        {noreply, S2#st{workers = NewWorkers}}
     catch
        Cat:Err:St ->
            ?LOG_ERROR("CAUGHT ~p:~p / ~p", [Cat, Err, St]),