143 lines
5.2 KiB
Erlang
143 lines
5.2 KiB
Erlang
%%-----------------------------------------------------------------------------
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%% Copyright (c) 2012-2015, Feng Lee <feng@emqtt.io>
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%%
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%% Permission is hereby granted, free of charge, to any person obtaining a copy
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%% of this software and associated documentation files (the "Software"), to deal
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%% in the Software without restriction, including without limitation the rights
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%% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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%% copies of the Software, and to permit persons to whom the Software is
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%% furnished to do so, subject to the following conditions:
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%%
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%% The above copyright notice and this permission notice shall be included in all
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%% copies or substantial portions of the Software.
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%%
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%% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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%% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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%% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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%% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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%% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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%% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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%% SOFTWARE.
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%%------------------------------------------------------------------------------
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-module(emqtt_server).
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-author('feng@slimpp.io').
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-include("emqtt.hrl").
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-include("emqtt_topic.hrl").
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-include("emqtt_packet.hrl").
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-behaviour(gen_server).
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-define(SERVER, ?MODULE).
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-define(RETAINED_TAB, mqtt_retained).
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-define(STORE_LIMIT, 100000).
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-record(mqtt_retained, {topic, qos, payload}).
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-record(state, {store_limit}).
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%% ------------------------------------------------------------------
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%% API Function Exports
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%% ------------------------------------------------------------------
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%%TODO: subscribe
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-export([start_link/1, retain/1, subscribe/2]).
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%% ------------------------------------------------------------------
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%% gen_server Function Exports
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%% ------------------------------------------------------------------
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-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
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terminate/2, code_change/3]).
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%% ------------------------------------------------------------------
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%% API Function Definitions
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%% ------------------------------------------------------------------
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start_link(RetainOpts) ->
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gen_server:start_link({local, ?SERVER}, ?MODULE, [RetainOpts], []).
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retain(#mqtt_message{ retain = false }) -> ignore;
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%% RETAIN flag set to 1 and payload containing zero bytes
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retain(#mqtt_message{ retain = true, topic = Topic, payload = <<>> }) ->
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mnesia:dirty_delete(?RETAINED_TAB, Topic);
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retain(Msg = #mqtt_message{retain = true}) ->
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gen_server:cast(?SERVER, {retain, Msg}).
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%%
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subscribe(Topics, CPid) when is_pid(CPid) ->
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lager:info("Retained Topics: ~p", [match(Topics)]),
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RetainedMsgs = lists:flatten([mnesia:dirty_read(?RETAINED_TAB, Topic) || Topic <- match(Topics)]),
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lager:info("Retained Messages: ~p", [RetainedMsgs]),
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lists:foreach(fun(Msg) ->
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CPid ! {dispatch, {self(), retained_msg(Msg)}}
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end, RetainedMsgs).
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%% ------------------------------------------------------------------
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%% gen_server Function Definitions
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%% ------------------------------------------------------------------
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init([RetainOpts]) ->
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mnesia:create_table(mqtt_retained, [
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{type, ordered_set},
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{ram_copies, [node()]},
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{attributes, record_info(fields, mqtt_retained)}]),
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mnesia:add_table_copy(mqtt_retained, node(), ram_copies),
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Limit = proplists:get_value(store_limit, RetainOpts, ?STORE_LIMIT),
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{ok, #state{store_limit = Limit}}.
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handle_call(Req, _From, State) ->
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{stop, {badreq, Req}, State}.
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handle_cast({retain, Msg = #mqtt_message{ qos = Qos,
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topic = Topic,
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payload = Payload }}, State = #state{store_limit = Limit}) ->
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case mnesia:table_info(?RETAINED_TAB, size) of
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Size when Size >= Limit ->
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lager:error("Server dropped message(retain) for table is full: ~p", [Msg]);
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_ ->
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lager:info("Server retained message: ~p", [Msg]),
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mnesia:dirty_write(#mqtt_retained{ topic = Topic,
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qos = Qos,
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payload = Payload })
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end,
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{noreply, State};
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handle_cast(Msg, State) ->
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{stop, {badmsg, Msg}, State}.
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handle_info(Info, State) ->
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{stop, {badinfo, Info}, State}.
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terminate(_Reason, _State) ->
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ok.
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code_change(_OldVsn, State, _Extra) ->
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{ok, State}.
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%% ------------------------------------------------------------------
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%% Internal Function Definitions
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%% ------------------------------------------------------------------
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match(Topics) ->
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RetainedTopics = mnesia:dirty_all_keys(?RETAINED_TAB),
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lists:flatten([match(Topic, RetainedTopics) || Topic <- Topics]).
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match(Topic, RetainedTopics) ->
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case emqtt_topic:type(#topic{name=Topic}) of
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direct -> %% FIXME
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[Topic];
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wildcard ->
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[ T || T <- RetainedTopics, emqtt_topic:match(T, Topic) ]
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end.
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retained_msg(#mqtt_retained{topic = Topic, qos = Qos, payload = Payload}) ->
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#mqtt_message { qos = Qos, retain = true, topic = Topic, payload = Payload }.
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