Use mongoose_backend in mod_global_distrib_mapping

big_tests/tests/mod_global_distrib_SUITE.erl

@@ -364,12 +364,11 @@ unpause_refresher(NodeName, _) ->
 %% Reads Redis to confirm that endpoints (in Redis) are overwritten
 %% with `advertised_endpoints` option value
 test_advertised_endpoints_override_endpoints(_Config) ->
-    Endps = execute_on_each_node(mod_global_distrib_mapping_redis,
-                                 get_endpoints,
-                                 [<<"reg1">>]),
-    true = lists:all(fun({ok, E}) ->
-                             lists:sort(iptuples_to_string(E)) =:=
-                                 lists:sort(advertised_endpoints()) end, Endps).
+    Endps = execute_on_each_node(mod_global_distrib_mapping_redis, get_endpoints, [<<"reg1">>]),
+    true = lists:all(
+             fun(E) ->
+                     lists:sort(iptuples_to_string(E)) =:= lists:sort(advertised_endpoints())
+             end, Endps).
 
 %% @doc Verifies that hosts refresher will restart the outgoing connection pool if
 %% it goes down for some reason (crash or domain unavailability).
@@ -1295,8 +1294,8 @@ service_port() ->
 
 wait_for_domain(Node, Domain) ->
     F = fun() ->
-        {ok, Domains} = rpc:call(Node, mod_global_distrib_mapping, all_domains, []),
-        lists:member(Domain, Domains)
+                Domains = rpc:call(Node, mod_global_distrib_mapping, all_domains, []),
+                lists:member(Domain, Domains)
         end,
     mongoose_helper:wait_until(F, true, #{name => {wait_for_domain, Node, Domain}}).
 

src/gen_mod.erl

@@ -31,7 +31,6 @@
 -export([
          % Modules start & stop, do NOT use in the tests, use mongoose_modules API instead
          start_module/3,
-         start_backend_module/2,
          start_backend_module/3,
          stop_module/2,
          does_module_support/2,
@@ -175,10 +174,7 @@ is_common_test_running() ->
         false
     end.
 
--spec start_backend_module(module(), list()) -> any().
-start_backend_module(Module, Opts) ->
-    start_backend_module(Module, Opts, []).
-
+%% @deprecated To be removed when mod_pubsub does not use it anymore
 start_backend_module(Module, Opts, TrackedFuncs) ->
     Backend = gen_mod:get_opt(backend, Opts, mnesia),
     backend_module:create(Module, Backend, TrackedFuncs).

src/global_distrib/mod_global_distrib_disco.erl

@@ -73,15 +73,12 @@ opt(Key) ->
 -spec domains_for_disco(Host :: jid:lserver(), From :: jid:jid()) -> Domains :: [binary()].
 domains_for_disco(_Host, #jid{ luser = <<>> } = _From) ->
     %% Currently all non-user entities may discover all services
-    {ok, Domains} = mod_global_distrib_mapping:all_domains(),
-    Domains;
+    mod_global_distrib_mapping:all_domains();
 domains_for_disco(Host, _From) ->
     case gen_mod:get_module_opt(Host, mod_disco, users_can_see_hidden_services, true) of
         true ->
-            {ok, Domains} = mod_global_distrib_mapping:all_domains(),
-            Domains;
+            mod_global_distrib_mapping:all_domains();
         false ->
-            {ok, Domains} = mod_global_distrib_mapping:public_domains(),
-            Domains
+            mod_global_distrib_mapping:public_domains()
     end.
 

src/global_distrib/mod_global_distrib_mapping.erl

@@ -35,44 +35,14 @@
          session_opened/5, session_closed/5]).
 -export([endpoints/1, hosts/0]).
 
--define(MOD_GLOBAL_DISTRIB_MAPPING_BACKEND, mod_global_distrib_mapping_backend).
 -ignore_xref([
-    {?MOD_GLOBAL_DISTRIB_MAPPING_BACKEND, get_domains, 0},
-    {?MOD_GLOBAL_DISTRIB_MAPPING_BACKEND, delete_domain, 1},
-    {?MOD_GLOBAL_DISTRIB_MAPPING_BACKEND, delete_session, 1},
-    {?MOD_GLOBAL_DISTRIB_MAPPING_BACKEND, get_endpoints, 1},
-    {?MOD_GLOBAL_DISTRIB_MAPPING_BACKEND, get_domain, 1},
-    {?MOD_GLOBAL_DISTRIB_MAPPING_BACKEND, get_session, 1},
-    {?MOD_GLOBAL_DISTRIB_MAPPING_BACKEND, get_hosts, 0},
-    {?MOD_GLOBAL_DISTRIB_MAPPING_BACKEND, get_public_domains, 0},
-    {?MOD_GLOBAL_DISTRIB_MAPPING_BACKEND, put_domain, 2},
-    {?MOD_GLOBAL_DISTRIB_MAPPING_BACKEND, put_session, 1},
-    {?MOD_GLOBAL_DISTRIB_MAPPING_BACKEND, start, 1},
-    {?MOD_GLOBAL_DISTRIB_MAPPING_BACKEND, stop, 0},
-    behaviour_info/1, delete_for_domain/1, delete_for_jid/1, insert_for_domain/1,
+    delete_for_domain/1, delete_for_jid/1, insert_for_domain/1,
     insert_for_domain/2, insert_for_domain/3, insert_for_jid/1, packet_to_component/3,
     register_subhost/3, session_closed/5, session_opened/5, unregister_subhost/2
 ]).
 
 -type endpoint() :: mod_global_distrib_utils:endpoint().
 
-%%--------------------------------------------------------------------
-%% Callbacks
-%%--------------------------------------------------------------------
-
--callback start(Opts :: proplists:proplist()) -> any().
--callback stop() -> any().
--callback put_session(JID :: binary()) -> ok | error.
--callback get_session(JID :: binary()) -> {ok, Host :: binary()} | error.
--callback delete_session(JID :: binary()) -> ok | error.
--callback put_domain(Domain :: binary(), IsHidden :: boolean()) -> ok | error.
--callback get_domain(Domain :: binary()) -> {ok, Host :: binary()} | error.
--callback delete_domain(Domain :: binary()) -> ok | error.
--callback get_domains() -> {ok, [Domain :: binary()]} | error.
--callback get_public_domains() -> {ok, [Domain :: binary()]} | error.
--callback get_endpoints(Host :: binary()) -> {ok, [endpoint()]}.
--callback get_hosts() -> [Host :: jid:lserver()].
-
 %%--------------------------------------------------------------------
 %% API
 %%--------------------------------------------------------------------
@@ -143,15 +113,15 @@ delete_for_jid({_, _, _} = Jid) ->
       end,
       normalize_jid(Jid)).
 
--spec all_domains() -> {ok, [jid:lserver()]}.
+-spec all_domains() -> [jid:lserver()].
 all_domains() ->
     mod_global_distrib_mapping_backend:get_domains().
 
--spec public_domains() -> {ok, [jid:lserver()]}.
+-spec public_domains() -> [jid:lserver()].
 public_domains() ->
     mod_global_distrib_mapping_backend:get_public_domains().
 
--spec endpoints(Host :: jid:lserver()) -> {ok, [endpoint()]}.
+-spec endpoints(Host :: jid:lserver()) -> [endpoint()].
 endpoints(Host) ->
     mod_global_distrib_mapping_backend:get_endpoints(Host).
 
@@ -237,8 +207,7 @@ deps(_Opts) ->
 start() ->
     Host = opt(global_host),
     Backend = opt(backend),
-    gen_mod:start_backend_module(?MODULE, [{backend, Backend}]),
-    mod_global_distrib_mapping_backend:start(opt(Backend)),
+    mod_global_distrib_mapping_backend:start([{backend, Backend} | opt(Backend)]),
 
     mongoose_metrics:ensure_metric(global, ?GLOBAL_DISTRIB_MAPPING_FETCH_TIME, histogram),
     mongoose_metrics:ensure_metric(global, ?GLOBAL_DISTRIB_MAPPING_FETCHES, spiral),

src/global_distrib/mod_global_distrib_mapping_backend.erl

@@ -0,0 +1,92 @@
+%%% @doc A proxy interface module between the main mod_global_distrib_mapping module
+%%% and the backend modules.
+%%% There is only one backend implementation (redis), so the backend module is global.
+-module(mod_global_distrib_mapping_backend).
+
+-export([start/1,
+         stop/0,
+         put_session/1,
+         get_session/1,
+         delete_session/1,
+         put_domain/2,
+         get_domain/1,
+         delete_domain/1,
+         get_domains/0,
+         get_public_domains/0,
+         get_endpoints/1,
+         get_hosts/0]).
+
+-define(MAIN_MODULE, mod_global_distrib_mapping).
+
+-type endpoint() :: mod_global_distrib_utils:endpoint().
+
+%% Callbacks
+
+-callback start(gen_mod:module_opts()) -> any().
+-callback stop() -> any().
+
+%% Mapping from a JID to the local host
+-callback put_session(jid:literal_jid()) -> ok.
+-callback get_session(jid:literal_jid()) -> {ok, jid:lserver()} | error.
+-callback delete_session(jid:literal_jid()) -> ok.
+
+%% Mapping from a domain to the local host
+-callback put_domain(jid:lserver(), IsHidden :: boolean()) -> ok.
+-callback get_domain(jid:lserver()) -> {ok, jid:lserver()} | error.
+-callback delete_domain(jid:lserver()) -> ok.
+
+-callback get_domains() -> [jid:lserver()].
+-callback get_public_domains() -> [jid:lserver()].
+-callback get_endpoints(jid:lserver()) -> [endpoint()].
+-callback get_hosts() -> [jid:lserver()].
+
+%% API Functions
+
+-spec start(gen_mod:module_opts()) -> any().
+start(Opts) ->
+    mongoose_backend:init(global, ?MAIN_MODULE, [], Opts),
+    mongoose_backend:call(global, ?MAIN_MODULE, ?FUNCTION_NAME, [Opts]).
+
+-spec stop() -> any().
+stop() ->
+    mongoose_backend:call(global, ?MAIN_MODULE, ?FUNCTION_NAME, []).
+
+-spec put_session(jid:literal_jid()) -> ok.
+put_session(JID) ->
+    mongoose_backend:call(global, ?MAIN_MODULE, ?FUNCTION_NAME, [JID]).
+
+-spec get_session(jid:literal_jid()) -> {ok, jid:lserver()} | error.
+get_session(JID) ->
+    mongoose_backend:call(global, ?MAIN_MODULE, ?FUNCTION_NAME, [JID]).
+
+-spec delete_session(jid:literal_jid()) -> ok.
+delete_session(JID) ->
+    mongoose_backend:call(global, ?MAIN_MODULE, ?FUNCTION_NAME, [JID]).
+
+-spec put_domain(jid:lserver(), boolean()) -> ok.
+put_domain(Domain, IsHidden) ->
+    mongoose_backend:call(global, ?MAIN_MODULE, ?FUNCTION_NAME, [Domain, IsHidden]).
+
+-spec get_domain(jid:lserver()) -> {ok, jid:lserver()} | error.
+get_domain(Domain) ->
+    mongoose_backend:call(global, ?MAIN_MODULE, ?FUNCTION_NAME, [Domain]).
+
+-spec delete_domain(jid:lserver()) -> ok.
+delete_domain(Domain) ->
+    mongoose_backend:call(global, ?MAIN_MODULE, ?FUNCTION_NAME, [Domain]).
+
+-spec get_domains() -> [jid:lserver()].
+get_domains() ->
+    mongoose_backend:call(global, ?MAIN_MODULE, ?FUNCTION_NAME, []).
+
+-spec get_public_domains() -> [jid:lserver()].
+get_public_domains() ->
+    mongoose_backend:call(global, ?MAIN_MODULE, ?FUNCTION_NAME, []).
+
+-spec get_endpoints(jid:lserver()) -> [endpoint()].
+get_endpoints(Domain) ->
+    mongoose_backend:call(global, ?MAIN_MODULE, ?FUNCTION_NAME, [Domain]).
+
+-spec get_hosts() -> [jid:lserver()].
+get_hosts() ->
+    mongoose_backend:call(global, ?MAIN_MODULE, ?FUNCTION_NAME, []).

src/global_distrib/mod_global_distrib_mapping_redis.erl

@@ -17,7 +17,7 @@
 -module(mod_global_distrib_mapping_redis).
 -author('konrad.zemek@erlang-solutions.com').
 
--behaviour(mod_global_distrib_mapping).
+-behaviour(mod_global_distrib_mapping_backend).
 
 -include("mongoose.hrl").
 
@@ -43,9 +43,9 @@
 %% API
 %%--------------------------------------------------------------------
 
--spec start(proplists:proplist()) -> any().
+-spec start(gen_mod:module_opts()) -> any().
 start(Opts) ->
-    RefreshAfter = proplists:get_value(refresh_after, Opts, 60),
+    RefreshAfter = gen_mod:get_opt(refresh_after, Opts, 60),
 
     mod_global_distrib_utils:create_ets([?MODULE, ?JIDS_ETS, ?DOMAINS_ETS, ?PUBLIC_DOMAINS_ETS]),
     ExpireAfter = proplists:get_value(expire_after, Opts, 120),
@@ -68,21 +68,21 @@ stop() ->
       [?MODULE, mod_global_distrib_redis_refresher]),
     [ets:delete(Tab) || Tab <- [?MODULE, ?JIDS_ETS, ?DOMAINS_ETS, ?PUBLIC_DOMAINS_ETS]].
 
--spec put_session(Jid :: binary()) -> ok.
+-spec put_session(jid:literal_jid()) -> ok.
 put_session(Jid) ->
     ets:insert(?JIDS_ETS, {Jid}),
     do_put(Jid, opt(local_host)).
 
--spec get_session(Jid :: binary()) -> {ok, Host :: binary()} | error.
+-spec get_session(jid:literal_jid()) -> {ok, jid:lserver()} | error.
 get_session(Jid) ->
     do_get(Jid).
 
--spec delete_session(Jid :: binary()) -> ok.
+-spec delete_session(jid:literal_jid()) -> ok.
 delete_session(Jid) ->
     ets:delete(?JIDS_ETS, Jid),
     do_delete(Jid).
 
--spec put_domain(Domain :: binary(), IsHidden :: boolean()) -> ok.
+-spec put_domain(jid:lserver(), IsHidden :: boolean()) -> ok.
 put_domain(Domain, IsHidden) ->
     ets:insert(?DOMAINS_ETS, {Domain}),
     {ok, _} = q([<<"SADD">>, domains_key(), Domain]),
@@ -96,37 +96,37 @@ put_domain(Domain, IsHidden) ->
             ok
     end.
 
--spec get_domain(Domain :: binary()) -> {ok, Host :: binary()} | error.
+-spec get_domain(jid:lserver()) -> {ok, jid:lserver()} | error.
 get_domain(Domain) ->
     do_get(Domain).
 
--spec delete_domain(Domain :: binary()) -> ok.
+-spec delete_domain(jid:lserver()) -> ok.
 delete_domain(Domain) ->
     ets:delete(?DOMAINS_ETS, Domain),
     ets:delete(?PUBLIC_DOMAINS_ETS, Domain),
     do_delete(Domain),
     {ok, _} = q([<<"SREM">>, domains_key(), Domain]),
     ok.
 
--spec get_domains() -> {ok, [Domain :: binary()]}.
+-spec get_domains() -> [jid:lserver()].
 get_domains() ->
     get_domains(fun domains_key/2).
 
--spec get_public_domains() -> {ok, [Domain :: binary()]}.
+-spec get_public_domains() -> [jid:lserver()].
 get_public_domains() ->
     get_domains(fun public_domains_key/2).
 
--spec get_endpoints(Host :: jid:lserver()) -> {ok, [mod_global_distrib_utils:endpoint()]}.
+-spec get_endpoints(Host :: jid:lserver()) -> [mod_global_distrib_utils:endpoint()].
 get_endpoints(Host) ->
     Nodes = get_nodes(Host),
     get_endpoints_for_nodes(Host, Nodes).
 
 get_endpoints_for_nodes(_Host, []) ->
-    {ok, []};
+    [];
 get_endpoints_for_nodes(Host, Nodes) ->
     EndpointKeys = [endpoints_key(Host, Node) || Node <- Nodes],
     {ok, BinEndpoints} = q([<<"SUNION">> | EndpointKeys]),
-    {ok, lists:map(fun binary_to_endpoint/1, BinEndpoints)}.
+    lists:map(fun binary_to_endpoint/1, BinEndpoints).
 
 %%--------------------------------------------------------------------
 %% gen_server API
@@ -258,12 +258,13 @@ do_delete(Key) ->
     ok.
 
 -spec get_domains(KeyFun :: fun((Host :: binary(), Node :: binary()) -> Key :: binary())) ->
-    {ok, Domains :: [binary()]}.
+          [jid:lserver()].
 get_domains(KeyFun) ->
     Hosts = get_hosts(),
     Nodes = lists:flatmap(fun(Host) -> [{Host, Node} || Node <- get_nodes(Host)] end, Hosts),
     Keys = [KeyFun(Host, Node) || {Host, Node} <- Nodes],
-    {ok, _Domains} = q([<<"SUNION">> | Keys]).
+    {ok, Domains} = q([<<"SUNION">> | Keys]),
+    Domains.
 
 -spec refresh_hosts() -> any().
 refresh_hosts() ->

src/global_distrib/mod_global_distrib_server_mgr.erl

@@ -369,7 +369,7 @@ pick_connection_pool(Enabled) ->
 refresh_connections(#state{ server = Server, pending_endpoints = PendingEndpoints,
                             last_endpoints = LastEndpoints } = State) ->
     ?LOG_DEBUG(ls(#{what => gd_refreshing_endpoints}, State)),
-    {ok, NewEndpoints} = get_endpoints(Server),
+    NewEndpoints = get_endpoints(Server),
     case NewEndpoints of
         LastEndpoints ->
             nothing_new;
@@ -403,15 +403,14 @@ refresh_connections(#state{ server = Server, pending_endpoints = PendingEndpoint
     end,
     State#state{ pending_endpoints = FinalPendingEndpoints, last_endpoints = NewEndpoints }.
 
--spec get_endpoints(Server :: jid:lserver()) -> {ok, [mod_global_distrib_utils:endpoint()]}.
+-spec get_endpoints(Server :: jid:lserver()) -> [mod_global_distrib_utils:endpoint()].
 get_endpoints(Server) ->
-    {ok, EndpointsToResolve} =
-    case mongoose_config:lookup_opt({global_distrib_addr, Server}) of
-        {error, not_found} -> mod_global_distrib_mapping:endpoints(Server);
-        {ok, Endpoints} -> {ok, Endpoints}
-    end,
-    Resolved = mod_global_distrib_utils:resolve_endpoints(EndpointsToResolve),
-    {ok, Resolved}.
+    EndpointsToResolve =
+        case mongoose_config:lookup_opt({global_distrib_addr, Server}) of
+            {error, not_found} -> mod_global_distrib_mapping:endpoints(Server);
+            {ok, Endpoints} -> Endpoints
+        end,
+    mod_global_distrib_utils:resolve_endpoints(EndpointsToResolve).
 
 -spec resolve_pending(NewEndpointList :: [mod_global_distrib_utils:endpoint()],
                       OldEnabled :: [endpoint_pid_tuple()]) ->