Do not depend on feature flags in mc

Addresses PR feedback
#11174 (comment)

deps/rabbit/BUILD.bazel

@@ -795,9 +795,6 @@ rabbitmq_suite(
 rabbitmq_suite(
     name = "mc_unit_SUITE",
     size = "small",
-    runtime_deps = [
-        "@meck//:erlang_app",
-    ],
     deps = [
         "//deps/amqp10_common:erlang_app",
         "//deps/rabbit_common:erlang_app",

deps/rabbit/include/mc.hrl

@@ -13,6 +13,8 @@
 -define(ANN_DURABLE, d).
 -define(ANN_PRIORITY, p).
 
+-define(FF_MC_DEATHS_V2, message_containers_deaths_v2).
+
 -type death_key() :: {SourceQueue :: rabbit_misc:resource_name(), rabbit_dead_letter:reason()}.
 -type death_anns() :: #{%% timestamp of the first time this message
                         %% was dead lettered from this queue for this reason

deps/rabbit/src/mc.erl

@@ -34,7 +34,7 @@
          convert/3,
          protocol_state/1,
          prepare/2,
-         record_death/3,
+         record_death/4,
          is_death_cycle/2,
          death_queue_names/1
         ]).
@@ -356,9 +356,11 @@ protocol_state(BasicMsg) ->
 
 -spec record_death(rabbit_dead_letter:reason(),
                    rabbit_misc:resource_name(),
-                   state()) -> state().
+                   state(),
+                   environment()) -> state().
 record_death(Reason, SourceQueue,
-             #?MODULE{annotations = Anns0} = State)
+             #?MODULE{annotations = Anns0} = State,
+             Env)
   when is_atom(Reason) andalso
        is_binary(SourceQueue) ->
     Key = {SourceQueue, Reason},
@@ -398,9 +400,11 @@ record_death(Reason, SourceQueue,
                           deaths := Deaths#deaths{last = Key,
                                                   records = Rs}};
                _ ->
-                   Rs = case rabbit_feature_flags:is_enabled(message_containers_deaths_v2) of
-                            true -> [{Key, NewDeath}];
-                            false -> #{Key => NewDeath}
+                   Rs = case Env of
+                            #{?FF_MC_DEATHS_V2 := false} ->
+                                #{Key => NewDeath};
+                            _ ->
+                                [{Key, NewDeath}]
                         end,
                    ReasonBin = atom_to_binary(Reason),
                    Anns0#{<<"x-first-death-reason">> => ReasonBin,
@@ -414,8 +418,8 @@ record_death(Reason, SourceQueue,
                                             records = Rs}}
            end,
     State#?MODULE{annotations = Anns};
-record_death(Reason, SourceQueue, BasicMsg) ->
-    mc_compat:record_death(Reason, SourceQueue, BasicMsg).
+record_death(Reason, SourceQueue, BasicMsg, Env) ->
+    mc_compat:record_death(Reason, SourceQueue, BasicMsg, Env).
 
 update_death(#death{count = Count,
                     anns = DeathAnns} = Death, Timestamp) ->

deps/rabbit/src/mc_compat.erl

@@ -26,7 +26,7 @@
          protocol_state/1,
          %serialize/1,
          prepare/2,
-         record_death/3,
+         record_death/4,
          is_death_cycle/2,
          %deaths/1,
          death_queue_names/1
@@ -155,7 +155,7 @@ prepare(store, Msg) ->
 record_death(Reason, SourceQueue,
              #basic_message{content = Content,
                             exchange_name = Exchange,
-                            routing_keys = RoutingKeys} = Msg) ->
+                            routing_keys = RoutingKeys} = Msg, _Env) ->
     % HeadersFun1 = fun (H) -> lists:keydelete(<<"CC">>, 1, H) end,
     ReasonBin = atom_to_binary(Reason),
     TimeSec = os:system_time(seconds),

deps/rabbit/src/rabbit_dead_letter.erl

@@ -31,7 +31,11 @@ publish(Msg0, Reason, #exchange{name = XName} = DLX, RK,
                   _ ->
                       [RK]
               end,
-    Msg1 = mc:record_death(Reason, SourceQName, Msg0),
+    Env = case rabbit_feature_flags:is_enabled(?FF_MC_DEATHS_V2) of
+              true -> #{};
+              false -> #{?FF_MC_DEATHS_V2 => false}
+          end,
+    Msg1 = mc:record_death(Reason, SourceQName, Msg0, Env),
     {Ttl, Msg2} = mc:take_annotation(dead_letter_ttl, Msg1),
     Msg3 = mc:set_ttl(Ttl, Msg2),
     Msg4 = mc:set_annotation(?ANN_ROUTING_KEYS, DLRKeys, Msg3),

deps/rabbit/src/rabbit_fifo_dlx_worker.erl

@@ -324,7 +324,11 @@ forward(ConsumedMsg, ConsumedMsgId, ConsumedQRef, DLX, Reason,
                   _ ->
                       [RKey]
               end,
-    Msg0 = mc:record_death(Reason, SourceQName, ConsumedMsg),
+    Env = case rabbit_feature_flags:is_enabled(?FF_MC_DEATHS_V2) of
+              true -> #{};
+              false -> #{?FF_MC_DEATHS_V2 => false}
+          end,
+    Msg0 = mc:record_death(Reason, SourceQName, ConsumedMsg, Env),
     Msg1 = mc:set_ttl(undefined, Msg0),
     Msg2 = mc:set_annotation(?ANN_ROUTING_KEYS, DLRKeys, Msg1),
     Msg = mc:set_annotation(?ANN_EXCHANGE, DLXName, Msg2),

deps/rabbit/test/mc_unit_SUITE.erl

@@ -45,14 +45,6 @@ all_tests() ->
      amqp_amqpl_amqp_bodies
     ].
 
-init_per_suite(Config) ->
-    meck:new(rabbit_feature_flags, [passthrough, no_link]),
-    Config.
-
-end_per_suite(Config) ->
-    meck:unload(rabbit_feature_flags),
-    Config.
-
 %%%===================================================================
 %%% Test cases
 %%%===================================================================
@@ -202,24 +194,18 @@ amqpl_table_x_header_array_of_tbls(_Config) ->
     ok.
 
 amqpl_death_v1_records(_Config) ->
-    meck:expect(rabbit_feature_flags,
-                is_enabled,
-                fun(message_containers_deaths_v2) -> false end),
-    ok = amqpl_death_records().
+    ok = amqpl_death_records(#{?FF_MC_DEATHS_V2 => false}).
 
 amqpl_death_v2_records(_Config) ->
-    meck:expect(rabbit_feature_flags,
-                is_enabled,
-                fun(message_containers_deaths_v2) -> true end),
-    ok = amqpl_death_records().
+    ok = amqpl_death_records(#{?FF_MC_DEATHS_V2 => true}).
 
-amqpl_death_records() ->
+amqpl_death_records(Env) ->
     Content = #content{class_id = 60,
                        properties = #'P_basic'{headers = []},
                        payload_fragments_rev = [<<"data">>]},
     Msg0 = mc:prepare(store, mc:init(mc_amqpl, Content, annotations())),
 
-    Msg1 = mc:record_death(rejected, <<"q1">>, Msg0),
+    Msg1 = mc:record_death(rejected, <<"q1">>, Msg0, Env),
     ?assertEqual([<<"q1">>], mc:death_queue_names(Msg1)),
     ?assertEqual(false, mc:is_death_cycle(<<"q1">>, Msg1)),
 
@@ -245,7 +231,7 @@ amqpl_death_records() ->
     %% record_death uses a timestamp for death record ordering, ensure
     %% it is definitely higher than the last timestamp taken
     timer:sleep(2),
-    Msg2 = mc:record_death(expired, <<"dl">>, Msg1),
+    Msg2 = mc:record_death(expired, <<"dl">>, Msg1, Env),
 
     #content{properties = #'P_basic'{headers = H2}} = mc:protocol_state(Msg2),
     {_, array, [{table, T2a}, {table, T2b}]} = header(<<"x-death">>, H2),
@@ -254,10 +240,6 @@ amqpl_death_records() ->
     ok.
 
 is_death_cycle(_Config) ->
-    meck:expect(rabbit_feature_flags,
-                is_enabled,
-                fun(message_containers_deaths_v2) -> true end),
-
     Content = #content{class_id = 60,
                        properties = #'P_basic'{headers = []},
                        payload_fragments_rev = [<<"data">>]},
@@ -267,29 +249,29 @@ is_death_cycle(_Config) ->
     %% Q1 --rejected--> Q2 --expired--> Q3 --expired-->
     %% Q1 --rejected--> Q2 --expired--> Q3
 
-    Msg1 = mc:record_death(rejected, <<"q1">>, Msg0),
+    Msg1 = mc:record_death(rejected, <<"q1">>, Msg0, #{}),
     ?assertNot(mc:is_death_cycle(<<"q1">>, Msg1),
                "A queue that dead letters to itself due to rejected is not considered a cycle."),
     ?assertNot(mc:is_death_cycle(<<"q2">>, Msg1)),
     ?assertNot(mc:is_death_cycle(<<"q3">>, Msg1)),
 
-    Msg2 = mc:record_death(expired, <<"q2">>, Msg1),
+    Msg2 = mc:record_death(expired, <<"q2">>, Msg1, #{}),
     ?assertNot(mc:is_death_cycle(<<"q1">>, Msg2)),
     ?assert(mc:is_death_cycle(<<"q2">>, Msg2),
             "A queue that dead letters to itself due to expired is considered a cycle."),
     ?assertNot(mc:is_death_cycle(<<"q3">>, Msg2)),
 
-    Msg3 = mc:record_death(expired, <<"q3">>, Msg2),
+    Msg3 = mc:record_death(expired, <<"q3">>, Msg2, #{}),
     ?assertNot(mc:is_death_cycle(<<"q1">>, Msg3)),
     ?assert(mc:is_death_cycle(<<"q2">>, Msg3)),
     ?assert(mc:is_death_cycle(<<"q3">>, Msg3)),
 
-    Msg4 = mc:record_death(rejected, <<"q1">>, Msg3),
+    Msg4 = mc:record_death(rejected, <<"q1">>, Msg3, #{}),
     ?assertNot(mc:is_death_cycle(<<"q1">>, Msg4)),
     ?assertNot(mc:is_death_cycle(<<"q2">>, Msg4)),
     ?assertNot(mc:is_death_cycle(<<"q3">>, Msg4)),
 
-    Msg5 = mc:record_death(expired, <<"q2">>, Msg4),
+    Msg5 = mc:record_death(expired, <<"q2">>, Msg4, #{}),
     ?assertNot(mc:is_death_cycle(<<"q1">>, Msg5)),
     ?assert(mc:is_death_cycle(<<"q2">>, Msg5)),
     ?assertNot(mc:is_death_cycle(<<"q3">>, Msg5)),