fix: include abcast as part of the cast batch

include/types.hrl

@@ -13,5 +13,11 @@
 %% atom names saves a little bit of bandwidth.
 -define(CAST(M, F, A), {cast, M, F, A}).
 -define(ORDERED_CAST(M, F, A), {oc, M, F, A}).
+-define(ABCAST(N, M), {abcast, N, M}).
 
--define(IS_CAST(MSG), ((MSG) =:= cast orelse (MSG) =:= oc)).
+-define(IS_CAST_MSG(MSG),
+    is_tuple(MSG) andalso
+    (element(1, MSG) =:= abcast orelse
+     element(1, MSG) =:= cast orelse
+     element(1, MSG) =:= oc)
+).

src/gen_rpc_acceptor.erl

@@ -136,24 +136,17 @@ waiting_for_data(info, {Driver,Socket,Data},
         ?ORDERED_CAST(M, F, A) ->
             handle_cast(M, F, A, true, State),
             {keep_state_and_data, gen_rpc_helper:get_inactivity_timeout(?MODULE)};
+        ?ABCAST(N, M) ->
+            handle_abcast(N, M, State),
+            {keep_state_and_data, gen_rpc_helper:get_inactivity_timeout(?MODULE)};
         BatchCast when is_list(BatchCast) ->
             lists:foreach(fun(?CAST(M, F, A))         -> handle_cast(M, F, A, false, State);
                              (?ORDERED_CAST(M, F, A)) -> handle_cast(M, F, A, true, State);
+                             (?ABCAST(N, M))          -> handle_abcast(N, M, State);
                              (Invalid)                -> ?tp(error, gen_rpc_invalid_batch, #{socket => gen_rpc_helper:socket_to_string(Socket), data => Invalid})
                           end,
                           BatchCast),
             {keep_state_and_data, gen_rpc_helper:get_inactivity_timeout(?MODULE)};
-        {abcast, Name, Msg} ->
-            _Result = case check_if_module_allowed(erlang, Control, List) of
-                true ->
-                    ?log(debug, "event=abcast_received driver=~s socket=\"~s\" peer=\"~s\" process=~s message=\"~p\"",
-                         [Driver, gen_rpc_helper:socket_to_string(Socket), gen_rpc_helper:peer_to_string(Peer), Name, Msg]),
-                    Msg = erlang:send(Name, Msg);
-                false ->
-                    ?log(debug, "event=request_not_allowed driver=~s socket=\"~s\" control=~s method=~s",
-                         [Driver, gen_rpc_helper:socket_to_string(Socket), Control, abcast])
-                end,
-            {keep_state_and_data, gen_rpc_helper:get_inactivity_timeout(?MODULE)};
         {sbcast, Name, Msg, Caller} ->
             Reply = case check_if_module_allowed(erlang, Control, List) of
                 true ->
@@ -350,6 +343,17 @@ handle_cast(M, F, A, Ordered, #state{socket=Socket, driver=Driver, peer=Peer, co
             ?log(debug, "event=request_not_allowed driver=~s socket=\"~s\" control=~s method=cast module=~s",[Driver, gen_rpc_helper:socket_to_string(Socket), Control, RealM])
     end.
 
+handle_abcast(Name, Msg, #state{socket=Socket, driver=Driver, peer=Peer, control=Control, list=List}) ->
+    case check_if_module_allowed(erlang, Control, List) of
+        true ->
+            ?log(debug, "event=abcast_received driver=~s socket=\"~s\" peer=\"~s\" process=~s message=\"~p\"",
+                 [Driver, gen_rpc_helper:socket_to_string(Socket), gen_rpc_helper:peer_to_string(Peer), Name, Msg]),
+            Msg = erlang:send({Name, node()}, Msg);
+        false ->
+            ?log(debug, "event=request_not_allowed driver=~s socket=\"~s\" control=~s method=~s",
+                 [Driver, gen_rpc_helper:socket_to_string(Socket), Control, abcast])
+        end.
+
 exec_cast(M, F, A, _PreserveOrder = true) ->
     {Pid, MRef} = erlang:spawn_monitor(M, F, A),
     receive

src/gen_rpc_client.erl

@@ -210,7 +210,7 @@ abcast(Name, Msg) when is_atom(Name) ->
 
 -spec abcast(list(), atom(), term()) -> abcast.
 abcast(Nodes, Name, Msg) when is_list(Nodes), is_atom(Name) ->
-    _ = [erlang:spawn(?MODULE, cast_worker, [Node, {abcast,Name,Msg}, abcast, undefined]) || Node <- Nodes],
+    _ = [do_abcast(Node, Name, Msg) || Node <- Nodes],
     abcast.
 
 -spec sbcast(atom(), term()) -> {list(), list()}.
@@ -330,18 +330,14 @@ handle_cast(Msg, #state{socket=Socket, driver=Driver} = State) ->
     {stop, {unknown_cast, Msg}, State}.
 
 %% This is the actual CAST handler for CAST
-handle_info({{Cast, _M, _F, _A} = PacketTuple, SendTimeout}, State = #state{max_batch_size = 0}) when ?IS_CAST(Cast) ->
-    send_cast(PacketTuple, State, SendTimeout, true);
-handle_info({{Cast, _M, _F, _A} = PacketTuple, SendTimeout}, State = #state{max_batch_size = MaxBatchSize}) when ?IS_CAST(Cast) ->
-    send_cast(drain_cast(MaxBatchSize, [PacketTuple]), State, SendTimeout, true);
-
-%% This is the actual CAST handler for ABCAST
-handle_info({{abcast,_Name,_Msg} = PacketTuple, undefined}, State) ->
-    send_cast(PacketTuple, State, undefined, false);
+handle_info({PacketTuple, SendTimeout}, State = #state{max_batch_size = 0}) when ?IS_CAST_MSG(PacketTuple) ->
+    send_cast(PacketTuple, State, SendTimeout);
+handle_info({PacketTuple, SendTimeout}, State = #state{max_batch_size = MaxBatchSize}) when ?IS_CAST_MSG(PacketTuple) ->
+    send_cast(drain_cast(MaxBatchSize, [PacketTuple]), State, SendTimeout);
 
 %% This is the actual CAST handler for SBCAST
 handle_info({{sbcast,_Name,_Msg,_Caller} = PacketTuple, undefined}, State) ->
-    send_cast(PacketTuple, State, undefined, true);
+    send_cast(PacketTuple, State, undefined);
 
 %% Handle any TCP packet coming in
 handle_info({Driver,Socket,Data}, #state{socket=Socket, driver=Driver, driver_mod=DriverMod} = State) ->
@@ -420,7 +416,7 @@ terminate(_Reason, #state{keepalive=KeepAlive}) ->
 %%% ===================================================
 %%% Private functions
 %%% ===================================================
-send_cast(PacketTuple, #state{socket=Socket, driver=Driver, driver_mod=DriverMod} = State, SendTimeout, Activate) ->
+send_cast(PacketTuple, #state{socket=Socket, driver=Driver, driver_mod=DriverMod} = State, SendTimeout) ->
     ?tp_ignore_side_effects_in_prod(
         gen_rpc_send_packet, #{ packet  => PacketTuple
                               , timeout => SendTimeout
@@ -439,10 +435,7 @@ send_cast(PacketTuple, #state{socket=Socket, driver=Driver, driver_mod=DriverMod
                                        }),
             {stop, Reason, State};
         ok ->
-            ok = case Activate of
-                     true -> DriverMod:activate_socket(Socket);
-                     _    -> ok
-                 end,
+            ok = DriverMod:activate_socket(Socket),
             ?log(debug, "message=cast event=transmission_succeeded driver=~s socket=\"~s\"",
                  [Driver, gen_rpc_helper:socket_to_string(Socket)]),
             {noreply, State, gen_rpc_helper:get_inactivity_timeout(?MODULE)}
@@ -578,12 +571,21 @@ drain_cast(N, CastReqs) ->
     receive
         {?CAST(_M,_F,_A) = Req, _} ->
             drain_cast(N-1, [Req | CastReqs]);
+        {?ABCAST(_N, _M) = Req, _} ->
+            drain_cast(N-1, [Req | CastReqs]);
         {?ORDERED_CAST(_M, _F, _A) = Req, _} ->
             drain_cast(N-1, [Req | CastReqs])
     after 0 ->
         lists:reverse(CastReqs)
     end.
 
+do_abcast({Node, _Tag}, Name, Msg) when Node =:= node() ->
+    Msg = erlang:send({Name, Node}, Msg);
+do_abcast(Node, Name, Msg) when Node =:= node() ->
+    Msg = erlang:send({Name, Node}, Msg);
+do_abcast(Node, Name, Msg) ->
+    erlang:spawn(?MODULE, cast_worker, [Node, {abcast,Name,Msg}, abcast, undefined]).
+
 -spec maybe_start_client(node_or_tuple()) -> {ok, pid()} | {error, any()}.
 maybe_start_client(NodeOrTuple) ->
     %% Create a unique name for the client because we register as such

src/gen_rpc_helper.erl

@@ -51,7 +51,7 @@
 %%% ===================================================
 
 %% term_to_iovec/1 wrapper to conditionally compress based on threshold
--spec term_to_iovec(term()) -> ext_iovec.
+-spec term_to_iovec(term()) -> erlang:iovec().
 term_to_iovec(Term) ->
   {ok, Compress} = application:get_env(?APP, compress),
   do_term_to_iovec(Term, Compress).

test/local_SUITE.erl

@@ -91,6 +91,34 @@ call_with_receive_timeout(_Config) ->
 call_with_worker_kill(_Config) ->
     {badrpc, killed} = gen_rpc:call(?MASTER, timer, kill_after, [0]).
 
+abcast(_Config) ->
+    true = erlang:register(test_process_123, self()),
+    abcast = gen_rpc:abcast([node()], test_process_123, this_is_a_test),
+    receive
+        this_is_a_test -> ok;
+        _ -> erlang:error(invalid_message)
+    after
+        2000 -> erlang:error(timeout)
+    end.
+
+abcast_with_key(_Config) ->
+    true = erlang:register(test_process_123, self()),
+    abcast = gen_rpc:abcast([{node(), 123}], test_process_123, this_is_a_test),
+    receive
+        this_is_a_test -> ok;
+        _ -> erlang:error(invalid_message)
+    after
+        2000 -> erlang:error(timeout)
+    end.
+
+abcast_with_unregistered_name(_Config) ->
+    abcast = gen_rpc:abcast([node()], test_process_123, this_is_a_test),
+    receive
+        _ -> erlang:error(invalid_message)
+    after
+        500 -> ok
+    end.
+
 %% call_module_version_check_success(_Config) ->
 %%     stub_function = gen_rpc:call(?MASTER, {gen_rpc_test_helper, "1.0.0"}, stub_function, []).
 

test/multi_rpc_SUITE.erl

@@ -197,6 +197,14 @@ abcast_with_bad_server(_Config) ->
     end,
     true = erlang:unregister(test_process_123).
 
+abcast_with_unregistered_name(_Config) ->
+    abcast = rpc:call(?SLAVE, gen_rpc, abcast, [[?MASTER, ?FAKE_NODE], test_process_123, this_is_a_test]),
+    receive
+        _ -> erlang:error(invalid_message)
+    after
+        2000 -> ok
+    end.
+
 sbcast(_Config) ->
     true = erlang:register(test_process_123, self()),
     {[?MASTER], []} = rpc:call(?SLAVE, gen_rpc, sbcast, [[?MASTER], test_process_123, this_is_a_test]),

test/multi_rpc_with_key_SUITE.erl

@@ -114,6 +114,14 @@ abcast_with_bad_server(_Config) ->
     end,
     true = erlang:unregister(test_process_123).
 
+abcast_with_unregistered_name(_Config) ->
+    abcast = rpc:call(?SLAVE, gen_rpc, abcast, [[{?MASTER,random_key}, ?FAKE_NODE], test_process_123, this_is_a_test]),
+    receive
+        _ -> erlang:error(invalid_message)
+    after
+        2000 -> ok
+    end.
+
 sbcast(_Config) ->
     true = erlang:register(test_process_123, self()),
     {[{?MASTER,random_key}], []} = rpc:call(?SLAVE, gen_rpc, sbcast, [[{?MASTER,random_key}], test_process_123, this_is_a_test]),