214 lines
9.1 KiB
Erlang
214 lines
9.1 KiB
Erlang
%%%-------------------------------------------------------------------
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%%% @author anlicheng
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%%% @copyright (C) 2025, <COMPANY>
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%%% @doc
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%%% 1. 需要管理服务的整个生命周期，包括: 启动，停止
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%%% 2. 需要监控服务的状态，通过port的方式
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%%% 3. 服务的启动和关闭，需要在更高的层级控制
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%%% @end
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%%% Created : 18. 4月 2025 16:50
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%%%-------------------------------------------------------------------
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-module(efka_container).
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-author("anlicheng").
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-include("efka_tables.hrl").
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-behaviour(gen_server).
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-define(STATUS_RUNNING, running).
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-define(STATUS_STOPPED, stopped).
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%% API
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-export([start_link/2]).
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-export([get_name/1, get_pid/1, attach_channel/3]).
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-export([invoke/3]).
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-export([metric_data/4, send_event/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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-record(state, {
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container_id :: binary(),
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%% 通道id信息
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channel_pid :: pid() | undefined,
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%% 数据上传的时候，用来管理容器和微服务
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meta_tag :: binary(),
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inflight = #{},
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%% 容器的运行状态
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status = ?STATUS_STOPPED,
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%% 映射关系: #{Ref => Fun}
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callbacks = #{}
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}).
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%%%===================================================================
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%%% API
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%%%===================================================================
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-spec get_name(ContainerId :: binary()) -> atom().
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get_name(ContainerId) when is_binary(ContainerId) ->
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list_to_atom("efka_container:" ++ binary_to_list(ContainerId)).
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-spec get_pid(ContainerId :: binary()) -> undefined | pid().
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get_pid(ContainerId) when is_binary(ContainerId) ->
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whereis(get_name(ContainerId)).
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-spec invoke(Pid :: pid(), Ref :: reference(), Payload :: binary()) -> no_return().
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invoke(Pid, Ref, Payload) when is_pid(Pid), is_reference(Ref), is_binary(Payload) ->
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gen_server:cast(Pid, {invoke, Ref, self(), Payload}).
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-spec metric_data(Pid :: pid(), DeviceUUID :: binary(), RouteKey :: binary(), Metric :: binary()) -> no_return().
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metric_data(Pid, DeviceUUID, RouteKey, Metric) when is_pid(Pid), is_binary(DeviceUUID), is_binary(RouteKey), is_binary(Metric) ->
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gen_server:cast(Pid, {metric_data, DeviceUUID, RouteKey, Metric}).
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-spec send_event(Pid :: pid(), EventType :: integer(), Params :: binary()) -> no_return().
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send_event(Pid, EventType, Params) when is_pid(Pid), is_integer(EventType), is_binary(Params) ->
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gen_server:cast(Pid, {send_event, EventType, Params}).
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-spec attach_channel(Pid :: pid(), ChannelPid :: pid(), MetaTag :: binary()) -> ok | {error, Reason :: binary()}.
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attach_channel(Pid, ChannelPid, MetaTag) when is_pid(Pid), is_pid(ChannelPid), is_binary(MetaTag) ->
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gen_server:call(Pid, {attach_channel, ChannelPid, MetaTag}).
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%% @doc Spawns the server and registers the local name (unique)
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-spec(start_link(Name :: atom(), ContainerId :: binary()) ->
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{ok, Pid :: pid()} | ignore | {error, Reason :: term()}).
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start_link(Name, ContainerId) when is_atom(Name), is_binary(ContainerId) ->
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gen_server:start_link({local, Name}, ?MODULE, [ContainerId], []).
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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([ContainerId]) ->
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%% supervisor进程通过exit(ChildPid, shutdown)调用的时候，确保terminate函数被调用
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erlang:process_flag(trap_exit, true),
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case efka_docker_command:is_container_running(ContainerId) of
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true ->
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efka_docker_events:monitor_container(self(), ContainerId),
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{ok, #state{container_id = ContainerId, status = ?STATUS_RUNNING}};
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false ->
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efka_docker_events:monitor_container(self(), ContainerId),
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{ok, #state{container_id = ContainerId, status = ?STATUS_STOPPED}}
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end.
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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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%% 绑定channel
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handle_call({attach_channel, ChannelPid, MetaTag}, _From, State = #state{channel_pid = OldChannelPid, container_id = ContainerId}) ->
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case is_pid(OldChannelPid) andalso is_process_alive(OldChannelPid) of
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false ->
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erlang:monitor(process, ChannelPid),
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lager:debug("[efka_service] service_id: ~p, channel attched", [ContainerId]),
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{reply, ok, State#state{channel_pid = ChannelPid, meta_tag = MetaTag}};
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true ->
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{reply, {error, <<"channel exists">>}, State}
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end;
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handle_call(_Request, _From, State = #state{}) ->
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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({metric_data, DeviceUUID, RouteKey, Metric}, State = #state{container_id = ContainerId, meta_tag = MetaTag}) ->
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lager:debug("[efka_service] container_id: ~p, meta: ~p, device_uuid: ~p, route_key: ~p, metric data: ~p",
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[ContainerId, MetaTag, DeviceUUID, RouteKey, Metric]),
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%% 这里的数据需要转换成和meta相关的数据
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efka_remote_agent:metric_data(MetaTag, DeviceUUID, RouteKey, Metric),
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{noreply, State};
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handle_cast({send_event, EventType, Params}, State = #state{container_id = ContainerId, meta_tag = MetaTag}) ->
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efka_remote_agent:event(MetaTag, EventType, Params),
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lager:debug("[efka_service] send_event, container_id: ~p, meta: ~p, event_type: ~p, params: ~p", [ContainerId, MetaTag, EventType, Params]),
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{noreply, State};
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%% 推送配置项目
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handle_cast({invoke, Ref, ReceiverPid, Payload}, State = #state{channel_pid = ChannelPid, inflight = Inflight}) ->
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case is_pid(ChannelPid) andalso is_process_alive(ChannelPid) of
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true ->
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ws_channel:invoke(ChannelPid, Ref, self(), Payload),
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{noreply, State#state{inflight = maps:put(Ref, ReceiverPid, Inflight)}};
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false ->
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ReceiverPid ! {service_reply, Ref, {error, <<"channel is not alive">>}},
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{reply, State}
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end;
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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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%% 处理channel的回复
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handle_info({channel_reply, Ref, Reply}, State = #state{inflight = Inflight, callbacks = Callbacks}) ->
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case maps:take(Ref, Inflight) of
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error ->
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{noreply, State};
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{ReceiverPid, NInflight} ->
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ReceiverPid ! {service_reply, Ref, Reply},
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{noreply, State#state{inflight = NInflight, callbacks = trigger_callback(Ref, Callbacks)}}
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end;
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handle_info({docker_events, start}, State) ->
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{noreply, State#state{status = ?STATUS_RUNNING}};
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handle_info({docker_events, stop}, State) ->
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{noreply, State#state{status = ?STATUS_STOPPED}};
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%% 处理channel进程的退出
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handle_info({'DOWN', _Ref, process, ChannelPid, Reason}, State = #state{channel_pid = ChannelPid, container_id = ContainerId}) ->
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lager:debug("[efka_service] service_id: ~p, channel exited: ~p", [ContainerId, Reason]),
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{noreply, State#state{channel_pid = undefined, inflight = #{}}}.
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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{container_id = ContainerId}) ->
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lager:debug("[efka_service] service_id: ~p, terminate with reason: ~p", [ContainerId, 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 trigger_callback(Ref :: reference(), Callbacks :: map()) -> NewCallbacks :: map().
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trigger_callback(Ref, Callbacks) ->
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case maps:take(Ref, Callbacks) of
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error ->
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Callbacks;
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{Fun, NCallbacks} ->
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catch Fun(),
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NCallbacks
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end. |