Mod last remove dynamic backend module

src/gen_mod.erl

@@ -49,7 +49,6 @@
          start_module/3,
          start_backend_module/2,
          start_backend_module/3,
-         get_backend_module/3,
          stop_module/2,
          stop_module_keep_config/2,
          reload_module/3,
@@ -225,14 +224,6 @@ start_backend_module(Module, Opts, TrackedFuncs) ->
     Backend = gen_mod:get_opt(backend, Opts, mnesia),
     backend_module:create(Module, Backend, TrackedFuncs).
 
--spec get_backend_module(host_type(), module(), atom()) -> module().
-get_backend_module(HostType, Module, DefaultBackend) ->
-    Backend = get_module_opt(HostType, Module, backend, DefaultBackend),
-    backend_module(Module, Backend).
-
-backend_module(Module, Backend) ->
-    list_to_atom(atom_to_list(Module) ++ "_" ++ atom_to_list(Backend)).
-
 -spec is_app_running(_) -> boolean().
 is_app_running(AppName) ->
     %% Use a high timeout to prevent a false positive in a high load system

src/mod_auth_token.erl

@@ -81,7 +81,7 @@
 -spec start(mongooseim:host_type(), gen_mod:module_opts()) -> ok.
 start(HostType, Opts) ->
     IQDisc = gen_mod:get_opt(iqdisc, Opts, no_queue),
-    mod_auth_token_backend:start(HostType),
+    mod_auth_token_backend:start(HostType, Opts),
     ejabberd_hooks:add(hooks(HostType)),
     gen_iq_handler:add_iq_handler_for_domain(
       HostType, ?NS_ESL_TOKEN_AUTH, ejabberd_sm,

src/mod_auth_token_backend.erl

@@ -5,7 +5,7 @@
 %%% @end
 %%%----------------------------------------------------------------------
 -module(mod_auth_token_backend).
--export([start/1,
+-export([start/2,
          revoke/2,
          get_valid_sequence_number/2,
          clean_tokens/2]).
@@ -26,9 +26,9 @@
 %% ----------------------------------------------------------------------
 %% API Functions
 
--spec start(HostType :: mongooseim:host_type()) -> ok.
-start(HostType) ->
-    mongoose_backend:init_per_host_type(HostType, ?MAIN_MODULE, [], rdbms),
+-spec start(HostType :: mongooseim:host_type(), Opts :: gen_mod:module_opts()) -> ok.
+start(HostType, Opts) ->
+    mongoose_backend:init_per_host_type(HostType, ?MAIN_MODULE, [], [{backend, rdbms} | Opts]),
     Args = [HostType],
     mongoose_backend:call(HostType, ?MAIN_MODULE, ?FUNCTION_NAME, Args).
 

src/mod_last.erl

@@ -53,14 +53,7 @@
 
 -export([config_metrics/1]).
 
--define(MOD_LAST_BACKEND, mod_last_backend).
 -ignore_xref([
-    {?MOD_LAST_BACKEND, init, 2},
-    {?MOD_LAST_BACKEND, get_last, 3},
-    {?MOD_LAST_BACKEND, count_active_users, 3},
-    {?MOD_LAST_BACKEND, set_last_info, 5},
-    {?MOD_LAST_BACKEND, remove_user, 3},
-    {?MOD_LAST_BACKEND, remove_domain, 2},
     behaviour_info/1, on_presence_update/5, process_local_iq/4,
     process_sm_iq/4, remove_user/3, session_cleanup/5, remove_domain/3
 ]).
@@ -73,34 +66,16 @@
 %% ------------------------------------------------------------------
 %% Backend callbacks
 
+-export_type([host_type/0, timestamp/0, status/0]).
+
 -type host_type() :: mongooseim:host_type().
 -type timestamp() :: non_neg_integer().
 -type status() :: binary().
 
--export_type([host_type/0, timestamp/0, status/0]).
-
--callback init(host_type(), gen_mod:module_opts()) -> ok.
-
--callback get_last(host_type(), jid:luser(), jid:lserver()) ->
-    {ok, timestamp(), status()} | {error, term()} | not_found.
-
--callback count_active_users(host_type(), jid:lserver(), timestamp()) ->
-    non_neg_integer().
-
--callback set_last_info(host_type(), jid:luser(), jid:lserver(), timestamp(), status()) ->
-    ok | {error, term()}.
-
--callback remove_user(host_type(), jid:luser(), jid:lserver()) ->
-    ok | {error, term()}.
-
--callback remove_domain(host_type(), jid:lserver()) ->
-    ok | {error, term()}.
-
 -spec start(mongooseim:host_type(), list()) -> 'ok'.
 start(HostType, Opts) ->
     IQDisc = gen_mod:get_opt(iqdisc, Opts, one_queue),
 
-    gen_mod:start_backend_module(?MODULE, Opts, [get_last, set_last_info]),
     mod_last_backend:init(HostType, Opts),
 
     [gen_iq_handler:add_iq_handler_for_domain(HostType, ?NS_LAST, Component, Fn, #{}, IQDisc) ||

src/mod_last_backend.erl

@@ -0,0 +1,74 @@
+%% Just a proxy interface module between the main mod_last module and
+%% the backend modules (i.e. mod_last_rdbms, mod_last_mnesia...).
+-module(mod_last_backend).
+
+-export([init/2,
+         get_last/3,
+         count_active_users/3,
+         set_last_info/5,
+         remove_user/3,
+         remove_domain/2]).
+
+-define(MAIN_MODULE, mod_last).
+
+-callback init(mod_last:host_type(), gen_mod:module_opts()) -> ok.
+
+-callback get_last(mod_last:host_type(), jid:luser(), jid:lserver()) ->
+    {ok, mod_last:timestamp(), mod_last:status()} | {error, term()} | not_found.
+
+-callback count_active_users(mod_last:host_type(), jid:lserver(), mod_last:timestamp()) ->
+    non_neg_integer().
+
+-callback set_last_info(
+            mod_last:host_type(),
+            jid:luser(),
+            jid:lserver(),
+            mod_last:timestamp(),
+            mod_last:status()) -> ok | {error, term()}.
+
+-callback remove_user(mod_last:host_type(), jid:luser(), jid:lserver()) ->
+    ok | {error, term()}.
+
+-callback remove_domain(mod_last:host_type(), jid:lserver()) ->
+    ok | {error, term()}.
+
+-spec init(mod_last:host_type(), gen_mod:module_opts()) -> ok.
+init(HostType, Opts) ->
+    TrackedFuns = [get_last, set_last_info],
+    mongoose_backend:init_per_host_type(HostType, ?MAIN_MODULE, TrackedFuns, Opts),
+    Args = [HostType, Opts],
+    mongoose_backend:call(HostType, ?MAIN_MODULE, ?FUNCTION_NAME, Args).
+
+-spec get_last(mod_last:host_type(), jid:luser(), jid:lserver()) ->
+    {ok, mod_last:timestamp(), mod_last:status()} | {error, term()} | not_found.
+get_last(HostType, LUser, LServer) ->
+    Args = [HostType, LUser, LServer],
+    mongoose_backend:call_tracked(HostType, ?MAIN_MODULE, ?FUNCTION_NAME, Args).
+
+-spec count_active_users(mod_last:host_type(), jid:lserver(), mod_last:timestamp()) ->
+    non_neg_integer().
+count_active_users(HostType, LServer, Timestamp) ->
+    Args = [HostType, LServer, Timestamp],
+    mongoose_backend:call(HostType, ?MAIN_MODULE, ?FUNCTION_NAME, Args).
+
+-spec set_last_info(
+            mod_last:host_type(),
+            jid:luser(),
+            jid:lserver(),
+            mod_last:timestamp(),
+            mod_last:status()) -> ok | {error, term()}.
+set_last_info(HostType, LUser, LServer, Timestamp, Status) ->
+    Args = [HostType, LUser, LServer, Timestamp, Status],
+    mongoose_backend:call_tracked(HostType, ?MAIN_MODULE, ?FUNCTION_NAME, Args).
+
+-spec remove_user(mod_last:host_type(), jid:luser(), jid:lserver()) ->
+    ok | {error, term()}.
+remove_user(HostType, LUser, LServer) ->
+    Args = [HostType, LUser, LServer],
+    mongoose_backend:call(HostType, ?MAIN_MODULE, ?FUNCTION_NAME, Args).
+
+-spec remove_domain(mod_last:host_type(), jid:lserver()) ->
+    ok | {error, term()}.
+remove_domain(HostType, LServer) ->
+    Args = [HostType, LServer],
+    mongoose_backend:call(HostType, ?MAIN_MODULE, ?FUNCTION_NAME, Args).

src/mod_last_mnesia.erl

@@ -12,7 +12,7 @@
 
 -module(mod_last_mnesia).
 
--behaviour(mod_last).
+-behaviour(mod_last_backend).
 
 -include("mod_last.hrl").
 -include("mongoose.hrl").

src/mod_last_rdbms.erl

@@ -12,7 +12,7 @@
 
 -module(mod_last_rdbms).
 
--behaviour(mod_last).
+-behaviour(mod_last_backend).
 
 -include("mongoose.hrl").
 

src/mod_last_riak.erl

@@ -45,7 +45,7 @@
 %%% @end
 -module(mod_last_riak).
 
--behaviour(mod_last).
+-behaviour(mod_last_backend).
 
 -include("mongoose.hrl").
 

src/mod_private_backend.erl

@@ -61,7 +61,7 @@
     Opts :: list().
 init(HostType, Opts) ->
     TrackedFuns = [multi_get_data, multi_set_data],
-    mongoose_backend:init_per_host_type(HostType, ?MAIN_MODULE, TrackedFuns),
+    mongoose_backend:init_per_host_type(HostType, ?MAIN_MODULE, TrackedFuns, Opts),
     Args = [HostType, Opts],
     mongoose_backend:call(HostType, ?MAIN_MODULE, ?FUNCTION_NAME, Args).
 

src/mongoose_backend.erl

@@ -1,8 +1,7 @@
 -module(mongoose_backend).
 
 %% API
--export([init_per_host_type/3,
-         init_per_host_type/4,
+-export([init_per_host_type/4,
          call/4,
          call_tracked/4]).
 
@@ -17,22 +16,20 @@
 -type main_module() :: module().
 -type backend_module() :: module().
 
--spec init_per_host_type(HostType :: mongooseim:host_type(),
-                         MainModule :: main_module(),
-                         TrackedFuns :: [function_name()]) -> ok.
-init_per_host_type(HostType, MainModule, TrackedFuns) ->
-    init_per_host_type(HostType, MainModule, TrackedFuns, mnesia).
-
 -spec init_per_host_type(HostType :: mongooseim:host_type(),
                          MainModule :: main_module(),
                          TrackedFuns :: [function_name()],
-                         DefaultBackend :: atom()) -> ok.
-init_per_host_type(HostType, MainModule, TrackedFuns, DefaultBackend) ->
+                         Opts :: gen_mod:module_opts()) -> ok.
+init_per_host_type(HostType, MainModule, TrackedFuns, Opts) ->
     ensure_backend_metrics(MainModule, TrackedFuns),
-    Backend = gen_mod:get_backend_module(HostType, MainModule, DefaultBackend),
-    persist_backend_name(HostType, MainModule, Backend),
+    Backend = gen_mod:get_opt(backend, Opts, mnesia),
+    BackendModule = backend_module(MainModule, Backend),
+    persist_backend_name(HostType, MainModule, BackendModule),
     ok.
 
+backend_module(Module, Backend) ->
+    list_to_atom(atom_to_list(Module) ++ "_" ++ atom_to_list(Backend)).
+
 call_metric(MainModule, FunName) ->
     [backends, MainModule, calls, FunName].
 

test/auth_tokens_SUITE.erl

@@ -241,7 +241,7 @@ mock_mongoose_metrics() ->
 
 mock_rdbms_backend() ->
     meck:new(mod_auth_token_backend, []),
-    meck:expect(mod_auth_token_backend, start, fun(_) -> ok end),
+    meck:expect(mod_auth_token_backend, start, fun(_, _) -> ok end),
     meck:expect(mod_auth_token_backend, get_valid_sequence_number,
                 fun (_, _) -> valid_seq_no_threshold() end),
     ok.