152 lines
5.6 KiB
Erlang
152 lines
5.6 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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%%%
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%%% @end
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%%% Created : 16. 9月 2025 16:48
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%%%-------------------------------------------------------------------
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-module(docker_events).
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-author("anlicheng").
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-behaviour(gen_server).
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%% API
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-export([start_link/0]).
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-export([monitor_container/2]).
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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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-record(state, {
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port,
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%% 观察者
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monitors = #{}
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}).
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%%%===================================================================
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%%% API
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%%%===================================================================
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-spec monitor_container(ReceiverPid :: pid(), ContainerId :: binary()) -> no_return().
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monitor_container(ReceiverPid, ContainerId) when is_pid(ReceiverPid), is_binary(ContainerId) ->
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gen_server:cast(?SERVER, {monitor_container, ReceiverPid, ContainerId}).
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%% @doc Spawns the server and registers the local name (unique)
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-spec(start_link() ->
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{ok, Pid :: pid()} | ignore | {error, Reason :: term()}).
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start_link() ->
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gen_server:start_link({local, ?SERVER}, ?MODULE, [], []).
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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([]) ->
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process_flag(trap_exit, true),
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try_attach_events(0),
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{ok, #state{}}.
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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(_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({monitor_container, ReceiverPid, ContainerId}, State = #state{monitors = Monitors}) ->
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MRef = erlang:monitor(process, ReceiverPid),
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{noreply, State#state{monitors = maps:put(ContainerId, {ReceiverPid, MRef}, Monitors)}}.
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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, _, attach_docker_events}, State = #state{port = undefined}) ->
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ExecCmd = "docker events --format \"{{json .}}\"",
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case catch erlang:open_port({spawn, ExecCmd}, [exit_status, {line, 10239}, use_stdio, stderr_to_stdout, binary]) of
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Port when is_port(Port) ->
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{noreply, State#state{port = Port}};
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_Error ->
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try_attach_events(5000),
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{noreply, State}
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end;
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handle_info({Port, {data, {eol, BinLine}}}, State = #state{port = Port}) ->
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Event = catch jiffy:decode(BinLine, [return_maps]),
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lager:debug("event: ~p", [Event]),
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handle_event(Event, State),
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{noreply, State};
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%% 进程退出的时候删除掉管理的Pid
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handle_info({'DOWN', MRef, process, _Pid, _Reason}, State = #state{monitors = Monitors}) ->
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NMonitors = maps:filter(fun(_Key, {_, Ref}) -> MRef =/= Ref end, Monitors),
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{noreply, State#state{monitors = NMonitors}};
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%% Port退出的时候，尝试重启
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handle_info({'EXIT', Port, Reason}, State = #state{port = Port}) ->
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lager:warning("[efka_docker_events] exit with reason: ~p", [Reason]),
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try_attach_events(5000),
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{noreply, State#state{port = undefined}}.
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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{}) ->
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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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handle_event(#{<<"Type">> := <<"container">>, <<"status">> := Status, <<"id">> := Id}, #state{monitors = Monitors}) ->
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case maps:find(Id, Monitors) of
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error ->
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ok;
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{ok, {ReceiverPid, _}} ->
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case Status of
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<<"start">> ->
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ReceiverPid ! {docker_events, start};
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<<"stop">> ->
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ReceiverPid ! {docker_events, stop};
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_ ->
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ok
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end
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end;
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handle_event(_, _) ->
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ok.
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try_attach_events(Timeout) ->
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erlang:start_timer(Timeout, self(), attach_docker_events).
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