Introduce deprecated features management

deps/rabbit/BUILD.bazel

@@ -386,6 +386,14 @@ rabbitmq_integration_suite(
     size = "medium",
 )
 
+rabbitmq_integration_suite(
+    name = "deprecated_features_SUITE",
+    size = "medium",
+    additional_beam = [
+        ":feature_flags_v2_SUITE_beam_files",
+    ],
+)
+
 rabbitmq_integration_suite(
     name = "disconnect_detected_during_alarm_SUITE",
     size = "medium",

deps/rabbit/Makefile

@@ -241,7 +241,7 @@ ct-slow: CT_SUITES = $(SLOW_CT_SUITES)
 # --------------------------------------------------------------------
 
 RMQ_ERLC_OPTS += -I $(DEPS_DIR)/rabbit_common/include
-EDOC_OPTS += {preprocess,true}
+EDOC_OPTS += {preprocess,true},{includes,["."]}
 
 ifdef INSTRUMENT_FOR_QC
 RMQ_ERLC_OPTS += -DINSTR_MOD=gm_qc

deps/rabbit/app.bzl

@@ -95,6 +95,7 @@ def all_beam_files(name = "all_beam_files"):
             "src/rabbit_definitions_hashing.erl",
             "src/rabbit_definitions_import_https.erl",
             "src/rabbit_definitions_import_local_filesystem.erl",
+            "src/rabbit_deprecated_features.erl",
             "src/rabbit_diagnostics.erl",
             "src/rabbit_direct.erl",
             "src/rabbit_direct_reply_to.erl",
@@ -338,6 +339,7 @@ def all_test_beam_files(name = "all_test_beam_files"):
             "src/rabbit_definitions_hashing.erl",
             "src/rabbit_definitions_import_https.erl",
             "src/rabbit_definitions_import_local_filesystem.erl",
+            "src/rabbit_deprecated_features.erl",
             "src/rabbit_diagnostics.erl",
             "src/rabbit_direct.erl",
             "src/rabbit_direct_reply_to.erl",
@@ -512,6 +514,7 @@ def all_srcs(name = "all_srcs"):
     filegroup(
         name = "private_hdrs",
         srcs = [
+            "src/rabbit_feature_flags.hrl",
             "src/rabbit_fifo.hrl",
             "src/rabbit_fifo_dlx.hrl",
             "src/rabbit_fifo_v0.hrl",
@@ -593,6 +596,7 @@ def all_srcs(name = "all_srcs"):
             "src/rabbit_definitions_hashing.erl",
             "src/rabbit_definitions_import_https.erl",
             "src/rabbit_definitions_import_local_filesystem.erl",
+            "src/rabbit_deprecated_features.erl",
             "src/rabbit_diagnostics.erl",
             "src/rabbit_direct.erl",
             "src/rabbit_direct_reply_to.erl",
@@ -878,6 +882,14 @@ def test_suite_beam_files(name = "test_suite_beam_files"):
         erlc_opts = "//:test_erlc_opts",
         deps = ["//deps/rabbit_common:erlang_app"],
     )
+    erlang_bytecode(
+        name = "deprecated_features_SUITE_beam_files",
+        testonly = True,
+        srcs = ["test/deprecated_features_SUITE.erl"],
+        outs = ["test/deprecated_features_SUITE.beam"],
+        app_name = "rabbit",
+        erlc_opts = "//:test_erlc_opts",
+    )
     erlang_bytecode(
         name = "direct_exchange_routing_v2_SUITE_beam_files",
         testonly = True,

deps/rabbit/docs/rabbitmq.conf.example

@@ -548,6 +548,25 @@
 ## NB: Change these only if you understand what you are doing!
 ##
 
+## To permit or deny a deprecated feature when it is in its
+## `permitted_by_default` or `denied_by_default` deprecation phase, the
+## default state can be overriden from the configuration.
+##
+## When a deprecated feature is permitted by default (first phase of the
+## deprecation period), it means the feature is available by default and can
+## be turned off by setting it to false in the configuration.
+##
+## When a deprecated feature is denied by default (second phase of the
+## deprecation period), it means the feature is unavailable by default but can
+## be turned back on by setting it to true in the configuration.
+##
+## When a deprecated feature is "disconnected" or "removed" (last two phases
+## of the deprecation period), it is no longer possible to turn it back on
+## from the configuration.
+##
+# deprecated_features.permit.a_deprecated_feature = true
+# deprecated_features.permit.another_deprecated_feature = false
+
 ## Timeout used when waiting for Mnesia tables in a cluster to
 ## become available.
 ##

deps/rabbit/priv/schema/rabbit.schema

@@ -2131,18 +2131,17 @@ end}.
 %% =====================================
 %%
 
-%% NOTE: `true` is intentionally omitted - add it back when mirrored
-%% queue deprecation is converted to use deprecated features system.
 {mapping,
- "deprecated_features.permit.$name", "rabbit.permitted_deprecated_features",
-    [{datatype, {enum, [false]}}]
+ "deprecated_features.permit.$name", "rabbit.permit_deprecated_features",
+ [{datatype, {enum, [true, false]}}]
 }.
 
 %% This converts:
-%%     deprecated_features.permit.my_feature = false
+%%     deprecated_features.permit.my_feature = true
 %% to:
-%%     {rabbit, [{permitted_deprecated_features, #{my_feature => false}}]}.
-{translation, "rabbit.permitted_deprecated_features",
+%%     {rabbit, [{permit_deprecated_features, #{my_feature => true}}]}.
+
+{translation, "rabbit.permit_deprecated_features",
  fun(Conf) ->
          Settings = cuttlefish_variable:filter_by_prefix(
                       "deprecated_features.permit", Conf),

deps/rabbit/src/rabbit.erl

@@ -512,7 +512,10 @@ start_apps(Apps, RestartTypes) ->
     %% We need to load all applications involved in order to be able to
     %% find new feature flags.
     app_utils:load_applications(Apps),
-    ok = rabbit_feature_flags:refresh_feature_flags_after_app_load(),
+    case rabbit_feature_flags:refresh_feature_flags_after_app_load() of
+        ok    -> ok;
+        Error -> throw(Error)
+    end,
     rabbit_prelaunch_conf:decrypt_config(Apps),
     lists:foreach(
       fun(App) ->
@@ -932,7 +935,10 @@ start(normal, []) ->
         %% once, because it does not involve running code from the
         %% plugins.
         ok = app_utils:load_applications(Plugins),
-        ok = rabbit_feature_flags:refresh_feature_flags_after_app_load(),
+        case rabbit_feature_flags:refresh_feature_flags_after_app_load() of
+            ok     -> ok;
+            Error1 -> throw(Error1)
+        end,
 
         persist_static_configuration(),