fix(doc): reflactor monitor

apps/emqx_dashboard/src/emqx_dashboard_monitor.erl

@@ -0,0 +1,87 @@
+%%--------------------------------------------------------------------
+%% Copyright (c) 2020-2022 EMQ Technologies Co., Ltd. All Rights Reserved.
+%%
+%% Licensed under the Apache License, Version 2.0 (the "License");
+%% you may not use this file except in compliance with the License.
+%% You may obtain a copy of the License at
+%%
+%%     http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+%%--------------------------------------------------------------------
+
+-module(emqx_dashboard_monitor).
+-behaviour(gen_server).
+
+-export([start_link/0]).
+
+-export([ init/1
+        , handle_call/3
+        , handle_cast/2
+        , handle_info/2
+        , terminate/2
+        , code_change/3
+        ]).
+
+-export([ mnesia/1]).
+
+-define(TAB, ?MODULE).
+
+-record(state, {}).
+-define(INIT_DATA,
+    #{
+        sent            => 0,
+        received        => 0,
+        sent_bytes      => 0,
+        received_bytes  => 0,
+        dropped         => 0,
+        subscriptions   => 0,
+        routes          => 0,
+        connection      => 0
+    }).
+
+-record(monitor_data)
+
+mnesia(boot) ->
+    ok = mria:create_table(?TAB, [
+        {type, set},
+        {local_content, true},
+        {storage, disc_copies},
+        {record_name, monitor_data},
+        {attributes, record_info(fields, monitor_data)}]).
+
+start_link() ->
+    gen_server:start_link({global, ?MODULE}, ?MODULE, [], []).
+
+init([]) ->
+    {ok, #state{}}.
+
+handle_call(_Request, _From, State = #state{}) ->
+    {reply, ok, State}.
+
+handle_cast(_Request, State = #state{}) ->
+    {noreply, State}.
+
+handle_info(_Info, State = #state{}) ->
+    {noreply, State}.
+
+terminate(_Reason, _State = #state{}) ->
+    ok.
+
+code_change(_OldVsn, State = #state{}, _Extra) ->
+    {ok, State}.
+
+%%%===================================================================
+%%% Internal functions
+%%%===================================================================
+
+next_interval() ->
+    ExpireInterval = emqx_conf:get([dashboard, monitor, interval], ?EXPIRE_INTERVAL),
+    ok.
+
+monit() ->
+    ok.