add mqtt consumer
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apps/iot/src/consumer/iot_zd_consumer.erl
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201
apps/iot/src/consumer/iot_zd_consumer.erl
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%%%-------------------------------------------------------------------
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%%% @author aresei
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%%% @copyright (C) 2023, <COMPANY>
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%%% @doc
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%%% 1. 需要考虑集群部署的相关问题，上行的数据可能在集群中共享
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%%% 2. host进程不能直接去监听topic，这样涉及到新增和下线的很多问题
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%%% @end
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%%% Created : 12. 3月 2023 21:27
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%%%-------------------------------------------------------------------
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-module(iot_zd_consumer).
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-author("aresei").
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-include("iot.hrl").
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-behaviour(gen_server).
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%% API
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-export([start_link/1]).
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%% gen_server callbacks
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-export([init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2, code_change/3]).
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-define(SERVER, ?MODULE).
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-define(RETRY_INTERVAL, 5000).
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%% 需要订阅的主题信息
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-define(Topics,[
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{<<"CET/NX/upload">>, 2}
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]).
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-record(state, {
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conn_pid :: pid(),
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logger_pid :: pid(),
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mqtt_props :: list(),
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is_connected = false
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}).
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%%%===================================================================
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%%% API
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%%%===================================================================
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%% @doc Spawns the server and registers the local name (unique)
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-spec(start_link(Props :: list()) ->
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{ok, Pid :: pid()} | ignore | {error, Reason :: term()}).
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start_link(Props) when is_list(Props) ->
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gen_server:start_link({local, ?MODULE}, ?MODULE, [Props], []).
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%%%===================================================================
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%%% gen_server callbacks
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%%%===================================================================
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%% @private
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%% @doc Initializes the server
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-spec(init(Args :: term()) ->
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{ok, State :: #state{}} | {ok, State :: #state{}, timeout() | hibernate} |
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{stop, Reason :: term()} | ignore).
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init([Props]) ->
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erlang:process_flag(trap_exit, true),
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%% 创建转发器, 避免阻塞当前进程的创建，因此采用了延时初始化的机制
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erlang:start_timer(0, self(), create_consumer),
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%% 启动日志记录器
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{ok, LoggerPid} = iot_logger:start_link("directive_data"),
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{ok, disconnected, #state{mqtt_props = Props, conn_pid = undefined, logger_pid = LoggerPid, is_connected = false}}.
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%% @private
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%% @doc Handling call messages
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-spec(handle_call(Request :: term(), From :: {pid(), Tag :: term()},
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State :: #state{}) ->
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{reply, Reply :: term(), NewState :: #state{}} |
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{reply, Reply :: term(), NewState :: #state{}, timeout() | hibernate} |
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{noreply, NewState :: #state{}} |
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{noreply, NewState :: #state{}, timeout() | hibernate} |
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{stop, Reason :: term(), Reply :: term(), NewState :: #state{}} |
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{stop, Reason :: term(), NewState :: #state{}}).
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handle_call(_Info, _From, State = #state{conn_pid = _ConnPid}) ->
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{reply, ok, State}.
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%% @private
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%% @doc Handling cast messages
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-spec(handle_cast(Request :: term(), State :: #state{}) ->
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{noreply, NewState :: #state{}} |
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{noreply, NewState :: #state{}, timeout() | hibernate} |
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{stop, Reason :: term(), NewState :: #state{}}).
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handle_cast(_Request, State = #state{}) ->
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{noreply, State}.
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%% @private
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%% @doc Handling all non call/cast messages
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-spec(handle_info(Info :: timeout() | term(), State :: #state{}) ->
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{noreply, NewState :: #state{}} |
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{noreply, NewState :: #state{}, timeout() | hibernate} |
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{stop, Reason :: term(), NewState :: #state{}}).
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handle_info({disconnect, ReasonCode, Properties}, State) ->
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lager:debug("[iot_zd_consumer] Recv a DISONNECT packet - ReasonCode: ~p, Properties: ~p", [ReasonCode, Properties]),
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{stop, disconnected, State};
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%% 必须要做到消息的快速分发，数据的json反序列需要在host进程进行
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handle_info({publish, #{packet_id := _PacketId, payload := Payload, qos := Qos, topic := Topic}}, State) ->
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lager:debug("[iot_zd_consumer] Recv a topic: ~p, publish packet: ~p, qos: ~p", [Topic, Payload, Qos]),
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%% 将消息分发到对应的host进程去处理
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{noreply, State};
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handle_info({puback, Packet = #{packet_id := _PacketId}}, State = #state{}) ->
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lager:debug("[iot_zd_consumer] receive puback packet: ~p", [Packet]),
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{noreply, State};
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handle_info({timeout, _, create_consumer}, State = #state{mqtt_props = Props, is_connected = false}) ->
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try
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{ok, ConnPid} = create_consumer(Props),
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{noreply, State#state{conn_pid = ConnPid}}
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catch _:Error:Stack ->
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lager:warning("[iot_zd_consumer] config: ~p, create consumer get error: ~p, stack: ~p", [Props, Error, Stack]),
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erlang:start_timer(?RETRY_INTERVAL, self(), create_consumer),
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{noreply, State#state{conn_pid = undefined}}
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end;
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%% postman进程挂掉时，重新建立新的
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handle_info({'EXIT', ConnPid, Reason}, State = #state{conn_pid = ConnPid}) ->
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lager:warning("[iot_zd_consumer] consumer exited with reason: ~p", [Reason]),
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erlang:start_timer(?RETRY_INTERVAL, self(), create_consumer),
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{next_state, disconnected, State#state{conn_pid = undefined}};
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handle_info(Info, State = #state{}) ->
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lager:debug("[iot_zd_consumer] get info: ~p", [Info]),
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{noreply, State}.
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%% @private
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%% @doc This function is called by a gen_server when it is about to
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%% terminate. It should be the opposite of Module:init/1 and do any
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%% necessary cleaning up. When it returns, the gen_server terminates
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%% with Reason. The return value is ignored.
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-spec(terminate(Reason :: (normal | shutdown | {shutdown, term()} | term()),
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State :: #state{}) -> term()).
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terminate(Reason, _State = #state{conn_pid = ConnPid}) when is_pid(ConnPid) ->
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%% 取消topic的订阅
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TopicNames = lists:map(fun({Name, _}) -> Name end, ?Topics),
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{ok, _Props, _ReasonCode} = emqtt:unsubscribe(ConnPid, #{}, TopicNames),
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ok = emqtt:disconnect(ConnPid),
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lager:debug("[iot_zd_consumer] terminate with reason: ~p", [Reason]),
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ok;
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terminate(Reason, _State) ->
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lager:debug("[iot_zd_consumer] terminate with reason: ~p", [Reason]),
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ok.
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%% @private
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%% @doc Convert process state when code is changed
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-spec(code_change(OldVsn :: term() | {down, term()}, State :: #state{},
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Extra :: term()) ->
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{ok, NewState :: #state{}} | {error, Reason :: term()}).
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code_change(_OldVsn, State = #state{}, _Extra) ->
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{ok, State}.
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%%%===================================================================
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%%% Internal functions
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%%%===================================================================
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-spec create_consumer(Props :: list()) -> {ok, ConnPid :: pid()} | {error, Reason :: any()}.
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create_consumer(Props) when is_list(Props) ->
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Node = atom_to_binary(node()),
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ClientId = <<"mqtt-client-", Node/binary, "-zhongdian_mqtt_consumer">>,
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%% 建立到emqx服务器的连接
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Host = proplists:get_value(host, Props),
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Port = proplists:get_value(port, Props, 18080),
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Username = proplists:get_value(username, Props),
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Password = proplists:get_value(password, Props),
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Keepalive = proplists:get_value(keepalive, Props, 86400),
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Opts = [
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{clientid, ClientId},
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{host, Host},
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{port, Port},
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{owner, self()},
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{tcp_opts, []},
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{username, Username},
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{password, Password},
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{keepalive, Keepalive},
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{auto_ack, true},
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{connect_timeout, 5000},
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{proto_ver, v5},
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{retry_interval, 5000}
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],
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%% 建立到emqx服务器的连接
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lager:debug("[iot_zd_consumer] opts is: ~p", [Opts]),
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case emqtt:start_link(Opts) of
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{ok, ConnPid} ->
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%% 监听和host相关的全部事件
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lager:debug("[iot_zd_consumer] start conntecting, pid: ~p", [ConnPid]),
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{ok, _} = emqtt:connect(ConnPid),
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lager:debug("[iot_zd_consumer] connect success, pid: ~p", [ConnPid]),
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SubscribeResult = emqtt:subscribe(ConnPid, ?Topics),
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lager:debug("[iot_zd_consumer] subscribe topics: ~p, result is: ~p", [?Topics, SubscribeResult]),
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{ok, ConnPid};
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ignore ->
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{error, ignore};
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{error, Reason} ->
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{error, Reason}
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end.
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