134 lines
5.2 KiB
Erlang
134 lines
5.2 KiB
Erlang
%%%-------------------------------------------------------------------
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%%% @author anlicheng
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%%% @copyright (C) 2024, <COMPANY>
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%%% @doc
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%%% 资源协调器，用来充分利用网络资源
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%%% @end
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%%% Created : 04. 6月 2024 10:55
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%%%-------------------------------------------------------------------
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-module(sdlan_network_coordinator).
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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([checkout/0, attach/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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release_count = 0,
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network_map = #{} %% {NetworkPid => ThrottleKey :: atom()}
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}).
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%%%===================================================================
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%%% API
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%%%===================================================================
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-spec attach(NetworkPid :: pid(), ThrottleKey :: atom()) -> no_return().
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attach(NetworkPid, ThrottleKey) when is_pid(NetworkPid), is_atom(ThrottleKey) ->
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gen_server:cast(?SERVER, {attach, NetworkPid, ThrottleKey}).
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-spec checkout() -> ok | error.
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checkout() ->
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gen_server:call(?SERVER, checkout).
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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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%% 让渡资源定时器
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erlang:start_timer(100, self(), release_ticker),
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{ok, #state{release_count = 0}}.
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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(checkout, _From, State = #state{release_count = Count}) ->
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case Count > 0 of
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true ->
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{reply, ok, State#state{release_count = Count - 1}};
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false ->
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{reply, error, State}
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end.
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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({attach, NetworkPid, ThrottleKey}, State = #state{network_map = NetworkMap}) ->
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monitor(process, NetworkPid),
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{noreply, State#state{network_map = maps:put(NetworkPid, ThrottleKey, NetworkMap)}}.
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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, _, release_ticker}, State = #state{network_map = ChannelMap}) ->
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%% 让渡资源定时器
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erlang:start_timer(100, self(), release_ticker),
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AccReleaseCount = lists:foldl(fun(ThrottleKey, Acc) ->
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case throttle:peek(sdlan_network, ThrottleKey) of
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{ok, RestCount, LeftToReset} ->
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{ok, NetworkBindWidth} = application:get_env(sdlan, network_bind_width),
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NeedCount = erlang:ceil(NetworkBindWidth / 1000 * LeftToReset),
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Acc + max(0, RestCount - NeedCount);
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{limit_exceeded, 0, _} ->
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Acc
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end
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end, 0, maps:keys(ChannelMap)),
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% logger:debug("[sdlan_network_coordinator] can release count is: ~p", [AccReleaseCount]),
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{noreply, State#state{release_count = AccReleaseCount}};
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handle_info({'DOWN', _, process, NetworkPid, Reason}, State = #state{network_map = NetworkMap}) ->
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logger:debug("[sdlan_network_coordinator] network_pid close with reason: ~p", [Reason]),
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{noreply, State#state{network_map = maps:remove(NetworkPid, NetworkMap)}}.
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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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