add kafka support
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apps/iot/src/endpoint/endpoint_kafka.erl
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176
apps/iot/src/endpoint/endpoint_kafka.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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%%%
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%%% @end
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%%% Created : 06. 7月 2023 12:02
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%%%-------------------------------------------------------------------
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-module(endpoint_kafka).
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-include("endpoint.hrl").
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-behaviour(gen_server).
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%% API
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-export([start_link/3]).
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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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%% 消息重发间隔
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-define(RETRY_INTERVAL, 5000).
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-define(DISCONNECTED, disconnected).
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-define(CONNECTED, connected).
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-record(state, {
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endpoint :: #endpoint{},
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buffer :: endpoint_buffer:buffer(),
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client_id :: atom(),
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client_pid :: undefined | pid(),
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status = ?DISCONNECTED
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}).
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%%%===================================================================
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%%% API
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%%%===================================================================
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%% @doc Creates a gen_statem process which calls Module:init/1 to
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%% initialize. To ensure a synchronized start-up procedure, this
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%% function does not return until Module:init/1 has returned.
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start_link(LocalName, AliasName, Endpoint = #endpoint{}) when is_atom(LocalName), is_atom(AliasName) ->
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gen_server:start_link({local, LocalName}, ?MODULE, [AliasName, Endpoint], []).
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%%%===================================================================
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%%% gen_statem callbacks
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%%%===================================================================
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%% @private
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%% @doc Whenever a gen_statem is started using gen_statem:start/[3,4] or
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%% gen_statem:start_link/[3,4], this function is called by the new
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%% process to initialize.
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init([AliasName, Endpoint = #endpoint{id = Id}]) ->
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iot_name_server:register(AliasName, self()),
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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(), connect),
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%% 初始化存储
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Buffer = endpoint_buffer:new(Endpoint, 10),
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ClientId = list_to_atom("brod_client:" ++ integer_to_list(Id)),
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{ok, #state{endpoint = Endpoint, buffer = Buffer, status = ?DISCONNECTED, client_id = ClientId}}.
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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(get_stat, _From, State = #state{buffer = Buffer}) ->
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Stat = endpoint_buffer:stat(Buffer),
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{reply, {ok, Stat}, 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({forward, ServiceId, Metric}, State = #state{buffer = Buffer}) ->
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NBuffer = endpoint_buffer:append({ServiceId, Metric}, Buffer),
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{noreply, State#state{buffer = NBuffer}}.
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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({timeout, _, connect}, State = #state{buffer = Buffer, status = ?DISCONNECTED, client_id = ClientId,
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endpoint = #endpoint{title = Title, config = #kafka_endpoint{username = Username, password = Password, bootstrap_servers = BootstrapServers0, topic = Topic}}}) ->
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lager:debug("[iot_endpoint] endpoint: ~p, create postman", [Title]),
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BootstrapServers = lists:flatmap(fun(S) ->
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case binary:split(S, <<":">>) of
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[Host0, Port] ->
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[{binary_to_list(Host0), binary_to_integer(Port)}];
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_ ->
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[]
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end
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end, BootstrapServers0),
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ClientConfig = [
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{reconnect_cool_down_seconds, 5},
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{socket_options, [{keepalive, true}]}
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],
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case brod:start_link_client(BootstrapServers, ClientId, ClientConfig) of
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{ok, ClientPid} ->
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ok = brod:start_producer(ClientId, Topic, _ProducerConfig = []),
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NBuffer = endpoint_buffer:trigger_next(Buffer),
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{noreply, State#state{buffer = NBuffer, client_pid = ClientPid, status = ?CONNECTED}};
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{error, Reason} ->
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lager:debug("[endpoint_kafka] start_client: ~p, get error: ~p", [ClientId, Reason]),
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retry_connect(),
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{noreply, State#state{status = ?DISCONNECTED, client_pid = undefined}}
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end;
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%% 离线时，忽略数据发送逻辑
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handle_info({next_data, _Id, _Tuple}, State = #state{status = ?DISCONNECTED}) ->
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{keep_state, State};
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%% 发送数据到mqtt服务器
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handle_info({next_data, Id, {_ServiceId, Metric}}, State = #state{status = ?CONNECTED, client_pid = ClientPid,
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endpoint = #endpoint{config = #kafka_endpoint{topic = Topic}}}) ->
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ReceiverPid = self(),
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AckCb = fun(Partition, BaseOffset) ->
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lager:debug("[endpoint_kafka] ack partion: ~p, offset: ~p", [Partition, BaseOffset]),
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ReceiverPid ! {ack, Id}
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end,
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ok = brod:produce_cb(ClientPid, Topic, random, <<>>, Metric, AckCb),
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{noreply, State};
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handle_info({ack, Id}, State = #state{buffer = Buffer}) ->
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NBuffer = endpoint_buffer:ack(Id, Buffer),
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{noreply, State#state{buffer = NBuffer}};
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%% postman进程挂掉时，重新建立新的
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handle_info({'EXIT', ClientPid, Reason}, State = #state{client_pid = ClientPid, endpoint = #endpoint{title = Title}}) ->
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lager:warning("[endpoint_kafka] endpoint: ~p, conn pid exit with reason: ~p", [Title, Reason]),
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retry_connect(),
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{noreply, State#state{client_pid = undefined, status = ?DISCONNECTED}};
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handle_info(Info, State = #state{status = Status}) ->
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lager:warning("[endpoint_kafka] unknown message: ~p, status: ~p", [Info, Status]),
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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{endpoint = #endpoint{title = Title}, buffer = Buffer}) ->
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lager:debug("[endpoint_kafka] endpoint: ~p, terminate with reason: ~p", [Title, Reason]),
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endpoint_buffer:cleanup(Buffer),
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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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retry_connect() ->
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erlang:start_timer(?RETRY_INTERVAL, self(), connect).
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@ -82,8 +82,8 @@ handle_call(get_stat, _From, State = #state{buffer = Buffer}) ->
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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({forward, ServiceId, Format, Metric}, State = #state{buffer = Buffer}) ->
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NBuffer = endpoint_buffer:append({ServiceId, Format, Metric}, Buffer),
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handle_cast({forward, ServiceId, Metric}, State = #state{buffer = Buffer}) ->
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NBuffer = endpoint_buffer:append({ServiceId, Metric}, Buffer),
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{noreply, State#state{buffer = NBuffer}}.
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%% @private
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