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emqx/src/emqx_zone.erl

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%%--------------------------------------------------------------------
%% Copyright (c) 2018-2022 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_zone).
-behaviour(gen_server).
-include("emqx.hrl").
-include("emqx_mqtt.hrl").
-include("logger.hrl").
-include("types.hrl").
-logger_header("[Zone]").
-compile({inline,
[ idle_timeout/1
, publish_limit/1
, ratelimit/1
, mqtt_frame_options/1
, mqtt_strict_mode/1
, max_packet_size/1
, mountpoint/1
, use_username_as_clientid/1
, stats_timer/1
, enable_stats/1
, enable_acl/1
, enable_ban/1
, enable_flapping_detect/1
, ignore_loop_deliver/1
, server_keepalive/1
, keepalive_backoff/1
, max_inflight/1
, session_expiry_interval/1
, force_gc_policy/1
, force_shutdown_policy/1
, response_information/1
, quota_policy/1
, get_env/2
, get_env/3
]}).
%% APIs
-export([start_link/0, stop/0]).
%% Zone Option API
-export([ idle_timeout/1
%% XXX: Dedeprecated at v4.2
, publish_limit/1
, ratelimit/1
, mqtt_frame_options/1
, mqtt_strict_mode/1
, max_packet_size/1
, mountpoint/1
, use_username_as_clientid/1
, stats_timer/1
, enable_stats/1
, enable_acl/1
, enable_ban/1
, enable_flapping_detect/1
, ignore_loop_deliver/1
, server_keepalive/1
, keepalive_backoff/1
, max_inflight/1
, session_expiry_interval/1
, force_gc_policy/1
, force_shutdown_policy/1
, response_information/1
, quota_policy/1
]).
-export([ init_gc_state/1
, oom_policy/1
]).
%% Zone API
-export([ get_env/2
, get_env/3
, set_env/3
, unset_env/2
, unset_all_env/0
]).
-export([force_reload/0]).
%% gen_server callbacks
-export([ init/1
, handle_call/3
, handle_cast/2
, handle_info/2
, terminate/2
, code_change/3
]).
-import(emqx_misc, [maybe_apply/2]).
-export_type([zone/0]).
-type(zone() :: atom()).
-define(TAB, ?MODULE).
-define(SERVER, ?MODULE).
-define(DEFAULT_IDLE_TIMEOUT, 30000).
-define(KEY(Zone, Key), {?MODULE, Zone, Key}).
-spec(start_link() -> startlink_ret()).
start_link() ->
gen_server:start_link({local, ?SERVER}, ?MODULE, [], []).
-spec(stop() -> ok).
stop() ->
gen_server:stop(?SERVER).
-spec(init_gc_state(zone()) -> maybe(emqx_gc:gc_state())).
init_gc_state(Zone) ->
maybe_apply(fun emqx_gc:init/1, force_gc_policy(Zone)).
-spec(oom_policy(zone()) -> emqx_types:oom_policy()).
oom_policy(Zone) -> force_shutdown_policy(Zone).
%%--------------------------------------------------------------------
%% Zone Options API
%%--------------------------------------------------------------------
-spec(idle_timeout(zone()) -> pos_integer()).
idle_timeout(Zone) ->
get_env(Zone, idle_timeout, ?DEFAULT_IDLE_TIMEOUT).
-spec(publish_limit(zone()) -> maybe(esockd_rate_limit:config())).
publish_limit(Zone) ->
get_env(Zone, publish_limit).
-spec(ratelimit(zone()) -> [emqx_limiter:specs()]).
ratelimit(Zone) ->
get_env(Zone, ratelimit, []).
-spec(mqtt_frame_options(zone()) -> emqx_frame:options()).
mqtt_frame_options(Zone) ->
#{strict_mode => mqtt_strict_mode(Zone),
max_size => max_packet_size(Zone)
}.
-spec(mqtt_strict_mode(zone()) -> boolean()).
mqtt_strict_mode(Zone) ->
get_env(Zone, strict_mode, false).
-spec(max_packet_size(zone()) -> integer()).
max_packet_size(Zone) ->
get_env(Zone, max_packet_size, ?MAX_PACKET_SIZE).
-spec(mountpoint(zone()) -> maybe(emqx_mountpoint:mountpoint())).
mountpoint(Zone) -> get_env(Zone, mountpoint).
-spec(use_username_as_clientid(zone()) -> boolean()).
use_username_as_clientid(Zone) ->
get_env(Zone, use_username_as_clientid, false).
-spec(stats_timer(zone()) -> undefined | disabled).
stats_timer(Zone) ->
case enable_stats(Zone) of true -> undefined; false -> disabled end.
-spec(enable_stats(zone()) -> boolean()).
enable_stats(Zone) ->
get_env(Zone, enable_stats, true).
-spec(enable_acl(zone()) -> boolean()).
enable_acl(Zone) ->
get_env(Zone, enable_acl, true).
-spec(enable_ban(zone()) -> boolean()).
enable_ban(Zone) ->
get_env(Zone, enable_ban, false).
-spec(enable_flapping_detect(zone()) -> boolean()).
enable_flapping_detect(Zone) ->
get_env(Zone, enable_flapping_detect, false).
-spec(ignore_loop_deliver(zone()) -> boolean()).
ignore_loop_deliver(Zone) ->
get_env(Zone, ignore_loop_deliver, false).
-spec(server_keepalive(zone()) -> maybe(pos_integer())).
server_keepalive(Zone) ->
get_env(Zone, server_keepalive).
-spec(keepalive_backoff(zone()) -> float()).
keepalive_backoff(Zone) ->
get_env(Zone, keepalive_backoff, 0.75).
-spec(max_inflight(zone()) -> 0..65535).
max_inflight(Zone) ->
get_env(Zone, max_inflight, 65535).
-spec(session_expiry_interval(zone()) -> non_neg_integer()).
session_expiry_interval(Zone) ->
get_env(Zone, session_expiry_interval, 0).
-spec(force_gc_policy(zone()) -> maybe(emqx_gc:opts())).
force_gc_policy(Zone) ->
get_env(Zone, force_gc_policy).
-spec(force_shutdown_policy(zone()) -> maybe(emqx_oom:opts())).
force_shutdown_policy(Zone) ->
get_env(Zone, force_shutdown_policy).
-spec(response_information(zone()) -> string()).
response_information(Zone) ->
get_env(Zone, response_information).
-spec(quota_policy(zone()) -> emqx_quota:policy()).
quota_policy(Zone) ->
get_env(Zone, quota, []).
%%--------------------------------------------------------------------
%% APIs
%%--------------------------------------------------------------------
-spec(get_env(maybe(zone()), atom()) -> maybe(term())).
get_env(undefined, Key) -> emqx:get_env(Key);
get_env(Zone, Key) ->
get_env(Zone, Key, undefined).
-spec(get_env(maybe(zone()), atom(), term()) -> maybe(term())).
get_env(undefined, Key, Def) ->
emqx:get_env(Key, Def);
get_env(Zone, Key, Def) ->
try persistent_term:get(?KEY(Zone, Key))
catch error:badarg ->
emqx:get_env(Key, Def)
end.
-spec(set_env(zone(), atom(), term()) -> ok).
set_env(Zone, Key, Val) ->
persistent_term:put(?KEY(Zone, Key), Val).
-spec(unset_env(zone(), atom()) -> boolean()).
unset_env(Zone, Key) ->
persistent_term:erase(?KEY(Zone, Key)).
-spec(unset_all_env() -> ok).
unset_all_env() ->
[unset_env(Zone, Key) || {?KEY(Zone, Key), _Val} <- persistent_term:get()],
ok.
-spec(force_reload() -> ok).
force_reload() ->
gen_server:call(?SERVER, force_reload).
%%--------------------------------------------------------------------
%% gen_server callbacks
%%--------------------------------------------------------------------
init([]) ->
_ = do_reload(),
{ok, #{}}.
handle_call(force_reload, _From, State) ->
_ = do_reload(),
{reply, ok, State};
handle_call(Req, _From, State) ->
?LOG(error, "Unexpected call: ~p", [Req]),
{reply, ignored, State}.
handle_cast(Msg, State) ->
?LOG(error, "Unexpected cast: ~p", [Msg]),
{noreply, State}.
handle_info(Info, State) ->
?LOG(error, "Unexpected info: ~p", [Info]),
{noreply, State}.
terminate(_Reason, _State) ->
ok.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%%--------------------------------------------------------------------
%% Internal functions
%%--------------------------------------------------------------------
do_reload() ->
[persistent_term:put(?KEY(Zone, Key), Val)
|| {Zone, Opts} <- emqx:get_env(zones, []), {Key, Val} <- Opts].
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