add server
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apps/efka/src/efka_server.erl
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102
apps/efka/src/efka_server.erl
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%%%-------------------------------------------------------------------
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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 : 18. 4月 2025 16:50
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%%%-------------------------------------------------------------------
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-module(efka_server).
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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/2]).
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-export([get_name/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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-record(state, {
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server_id :: binary()
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}).
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%%%===================================================================
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%%% API
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%%%===================================================================
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-spec get_name(ServerId :: binary()) -> atom().
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get_name(ServerId) when is_binary(ServerId) ->
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list_to_atom("efka_server:" ++ binary_to_list(ServerId)).
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%% @doc Spawns the server and registers the local name (unique)
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-spec(start_link(Name :: atom(), ServerId :: binary()) ->
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{ok, Pid :: pid()} | ignore | {error, Reason :: term()}).
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start_link(Name, ServerId) when is_atom(Name), is_binary(ServerId) ->
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gen_server:start_link({local, Name}, ?MODULE, [ServerId], []).
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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([ServerId]) ->
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{ok, #state{server_id = ServerId}}.
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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(_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(_Info, State = #state{}) ->
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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{}) ->
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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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79
apps/efka/src/efka_server_sup.erl
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79
apps/efka/src/efka_server_sup.erl
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%%%-------------------------------------------------------------------
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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 : 18. 4月 2025 16:42
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%%%-------------------------------------------------------------------
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-module(efka_server_sup).
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-author("anlicheng").
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-behaviour(supervisor).
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%% API
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-export([start_link/0]).
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%% Supervisor callbacks
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-export([init/1]).
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-define(SERVER, ?MODULE).
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%%%===================================================================
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%%% API functions
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%%%===================================================================
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%% @doc Starts the supervisor
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-spec(start_link() -> {ok, Pid :: pid()} | ignore | {error, Reason :: term()}).
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start_link() ->
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supervisor:start_link({local, ?SERVER}, ?MODULE, []).
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%%%===================================================================
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%%% Supervisor callbacks
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%%%===================================================================
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%% @private
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%% @doc Whenever a supervisor is started using supervisor:start_link/[2,3],
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%% this function is called by the new process to find out about
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%% restart strategy, maximum restart frequency and child
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%% specifications.
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-spec(init(Args :: term()) ->
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{ok, {SupFlags :: {RestartStrategy :: supervisor:strategy(),
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MaxR :: non_neg_integer(), MaxT :: non_neg_integer()},
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[ChildSpec :: supervisor:child_spec()]}}
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| ignore | {error, Reason :: term()}).
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init([]) ->
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SupFlags = #{strategy => one_for_one, intensity => 1000, period => 3600},
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{ok, {SupFlags, []}}.
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%%%===================================================================
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%%% Internal functions
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%%%===================================================================
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-spec start_server(ServerId :: binary()) -> {ok, Pid :: pid()} | {error, Reason :: any()}.
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start_server(ServerId) when is_binary(ServerId) ->
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case supervisor:start_child(?MODULE, child_spec(ServerId)) of
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{ok, Pid} when is_pid(Pid) ->
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{ok, Pid};
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{error, {'already_started', Pid}} when is_pid(Pid) ->
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{ok, Pid};
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{error, Error} ->
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{error, Error}
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end.
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delete_server(ServerId) when is_binary(ServerId) ->
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ChildId = efka_server:get_name(ServerId),
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ok = supervisor:terminate_child(?MODULE, ChildId),
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supervisor:delete_child(?MODULE, ChildId).
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child_spec(ServerId) when is_binary(ServerId) ->
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Name = efka_server:get_name(ServerId),
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#{
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id => Name,
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start => {efka_server, start_link, [Name, ServerId]},
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restart => permanent,
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shutdown => 2000,
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type => worker,
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modules => ['efka_server']
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}.
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