fix(config): restart app after config update in cluster

apps/emqx_prometheus/src/emqx_prometheus.erl

@@ -22,9 +22,11 @@
 %% be used by the prometheus application
 -behaviour(prometheus_collector).
 
+-include("emqx_prometheus.hrl").
+
 -include_lib("prometheus/include/prometheus.hrl").
 -include_lib("prometheus/include/prometheus_model.hrl").
-
+-include_lib("emqx/include/logger.hrl").
 
 -import(prometheus_model_helpers,
         [ create_mf/5
@@ -32,6 +34,16 @@
         , counter_metric/1
         ]).
 
+-export([ update/1
+        , start/0
+        , stop/0
+        , restart/0
+        % for rpc
+        , do_start/0
+        , do_stop/0
+        , do_restart/0
+        ]).
+
 %% APIs
 -export([start_link/1]).
 
@@ -58,6 +70,53 @@
 
 -record(state, {push_gateway, timer, interval}).
 
+%%--------------------------------------------------------------------
+%% update new config
+update(Config) ->
+    case emqx:update_config([prometheus], Config,
+                            #{rawconf_with_defaults => true, override_to => cluster}) of
+        {ok, #{raw_config := NewConfigRows}} ->
+            case maps:get(<<"enable">>, Config, true) of
+                true ->
+                    ok = restart();
+                false ->
+                    ok = stop()
+            end,
+            {ok, NewConfigRows};
+        {error, Reason} ->
+            {error, Reason}
+    end.
+
+start()   -> cluster_call(do_start, []).
+stop()    -> cluster_call(do_stop, []).
+restart() -> cluster_call(do_restart, []).
+
+do_start() ->
+    emqx_prometheus_sup:start_child(?APP, emqx_conf:get([prometheus])).
+
+do_stop() ->
+    emqx_prometheus_sup:stop_child(?APP).
+
+do_restart() ->
+    case {stop(), start()} of
+        {ok, ok} ->
+            ok;
+        {Error1, Error2} ->
+            ?LOG(error, "~p restart failed stop: ~p start: ~p", [?MODULE, Error1, Error2])
+    end.
+
+cluster_call(F, A) ->
+    [ok = rpc_call(N, F, A) || N <- mria_mnesia:running_nodes()].
+
+rpc_call(N, F, A) ->
+    case rpc:call(N, ?MODULE, F, A, 5000) of
+        {badrpc, R} ->
+            ?LOG(error, "RPC Node: ~p ~p ~p failed, Reason: ~p", [N, ?MODULE, F, R]),
+            {error, {badrpc, R}};
+        Result ->
+            Result
+    end.
+
 %%--------------------------------------------------------------------
 %% APIs
 %%--------------------------------------------------------------------

apps/emqx_prometheus/src/emqx_prometheus_api.erl

@@ -67,17 +67,8 @@ prometheus(get, _Params) ->
     {200, emqx:get_raw_config([<<"prometheus">>], #{})};
 
 prometheus(put, #{body := Body}) ->
-    case emqx:update_config([prometheus],
-                            Body,
-                            #{rawconf_with_defaults => true, override_to => cluster}) of
-        {ok, #{raw_config := NewConfig, config := Config}} ->
-            case maps:get(<<"enable">>, Body, true) of
-                true ->
-                    ok = emqx_prometheus_sup:stop_child(?APP),
-                    ok = emqx_prometheus_sup:start_child(?APP, Config);
-                false ->
-                    ok = emqx_prometheus_sup:stop_child(?APP)
-            end,
+    case emqx_prometheus:update(Body) of
+        {ok, NewConfig} ->
             {200, NewConfig};
         {error, Reason} ->
             Message = list_to_binary(io_lib:format("Update config failed ~p", [Reason])),

apps/emqx_statsd/src/emqx_statsd.erl

@@ -25,6 +25,18 @@
 
 -include("emqx_statsd.hrl").
 
+-include_lib("emqx/include/logger.hrl").
+
+-export([ update/1
+        , start/0
+        , stop/0
+        , restart/0
+        %% for rpc
+        , do_start/0
+        , do_stop/0
+        , do_restart/0
+        ]).
+
 %% Interface
 -export([start_link/1]).
 
@@ -44,6 +56,52 @@
     estatsd_pid          :: pid()
 }).
 
+update(Config) ->
+    case emqx:update_config([statsd],
+                            Config,
+                            #{rawconf_with_defaults => true, override_to => cluster}) of
+        {ok, #{raw_config := NewConfigRows}} ->
+            start(),
+            case maps:get(<<"enable">>, Config) of
+                true -> stop();
+                false -> ok
+            end,
+            {ok, NewConfigRows};
+        {error, Reason} ->
+            {error, Reason}
+    end.
+
+
+start()   -> cluster_call(do_start, []).
+stop()    -> cluster_call(do_stop, []).
+restart() -> cluster_call(do_restart, []).
+
+do_start() ->
+    emqx_statsd_sup:ensure_child_started(?APP, emqx_conf:get([statsd], #{})).
+
+do_stop() ->
+    emqx_statsd_sup:ensure_child_stopped(?APP).
+
+do_restart() ->
+    case {stop(), start()} of
+        {ok, ok} ->
+            ok;
+        {Error1, Error2} ->
+            ?LOG(error, "~p restart failed stop: ~p start: ~p", [?MODULE, Error1, Error2])
+    end.
+
+cluster_call(F, A) ->
+    [ok = rpc_call(N, F, A) || N <- mria_mnesia:running_nodes()].
+
+rpc_call(N, F, A) ->
+    case rpc:call(N, ?MODULE, F, A, 5000) of
+        {badrpc, R} ->
+            ?LOG(error, "RPC Node: ~p ~p ~p failed, Reason: ~p", [N, ?MODULE, F, R]),
+            {error, {badrpc, R}};
+        Result ->
+            Result
+    end.
+
 start_link(Opts) ->
     gen_server:start_link({local, ?MODULE}, ?MODULE, [Opts], []).
 

apps/emqx_statsd/src/emqx_statsd_api.erl

@@ -55,15 +55,8 @@ statsd(get, _Params) ->
     {200, emqx:get_raw_config([<<"statsd">>], #{})};
 
 statsd(put, #{body := Body}) ->
-    case emqx:update_config([statsd],
-                            Body,
-                            #{rawconf_with_defaults => true, override_to => cluster}) of
-        {ok, #{raw_config := NewConfig, config := Config}} ->
-            ok = emqx_statsd_sup:ensure_child_stopped(?APP),
-            case maps:get(<<"enable">>, Body) of
-                true -> emqx_statsd_sup:ensure_child_started(?APP, Config);
-                false -> ok
-            end,
+    case emqx_statsd:update(Body) of
+        {ok, NewConfig} ->
             {200, NewConfig};
         {error, Reason} ->
             Message = list_to_binary(io_lib:format("Update config failed ~p", [Reason])),