142 lines
5.3 KiB
Erlang
142 lines
5.3 KiB
Erlang
%%%-------------------------------------------------------------------
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%%% @author anlicheng
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%%% @copyright (C) 2026, <COMPANY>
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%%% @doc
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%%%
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%%% @end
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%%% Created : 09. 5月 2026 18:02
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%%%-------------------------------------------------------------------
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-module(udp_server).
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-author("anlicheng").
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-behaviour(gen_server).
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-define(HEARTBEAT_VERSION, 1).
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-define(HEARTBEAT_NONCE_BYTES, 16).
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-define(HEARTBEAT_MAC_BYTES, 32).
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%% API
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-export([start_link/0]).
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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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socket :: gen_udp:socket()
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}).
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%%%===================================================================
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%%% API
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%%%===================================================================
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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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ok = iot_log:set_metadata(),
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{ok, UdpServerProps} = application:get_env(iot, udp_server),
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Port = proplists:get_value(port, UdpServerProps),
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logger:debug("[udp_server] start at port: ~p", [Port]),
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{ok, Socket} = gen_udp:open(Port, [binary, {active, true}]),
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{ok, #state{socket = Socket}}.
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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({udp, Socket, Ip, Port, Packet}, State = #state{socket = Socket}) ->
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handle_heartbeat_packet(Packet, {Ip, Port}),
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{noreply, State};
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handle_info(Info, State = #state{}) ->
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logger:warning("[udp_server] ignore unknown info: ~p", [Info]),
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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{socket = Socket}) ->
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gen_udp:close(Socket),
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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 handle_heartbeat_packet(binary(), term()) -> ok.
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handle_heartbeat_packet(Packet, Peer) when is_binary(Packet) ->
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case decode_heartbeat_packet(Packet) of
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{ok, UUID, Timestamp, Payload, Mac} ->
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case efka_client_store:verify_heartbeat(UUID, Timestamp, Payload, Mac) of
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true ->
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Pid = iot_host:get_pid(UUID),
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iot_host:heartbeat(Pid);
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false ->
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logger:warning("[udp_server] ignore invalid heartbeat auth from peer: ~p, uuid: ~p", [Peer, UUID]),
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ok
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end;
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error ->
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logger:warning("[udp_server] ignore invalid heartbeat packet from peer: ~p, packet: ~p", [Peer, Packet]),
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ok
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end.
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-spec decode_heartbeat_packet(binary()) ->
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{ok, UUID :: binary(), Timestamp :: integer(), Payload :: binary(), Mac :: binary()} | error.
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decode_heartbeat_packet(Packet = <<?HEARTBEAT_VERSION:8, UUIDLen:16, UUID:UUIDLen/binary,
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Timestamp:64/unsigned-big, _Nonce:?HEARTBEAT_NONCE_BYTES/binary, _Mac:?HEARTBEAT_MAC_BYTES/binary>>)
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when UUIDLen > 0 ->
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PayloadSize = byte_size(Packet) - ?HEARTBEAT_MAC_BYTES,
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<<Payload:PayloadSize/binary, Mac:?HEARTBEAT_MAC_BYTES/binary>> = Packet,
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{ok, UUID, Timestamp, Payload, Mac};
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decode_heartbeat_packet(_Packet) ->
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error.
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