197 lines
8.9 KiB
Erlang
197 lines
8.9 KiB
Erlang
%%%-------------------------------------------------------------------
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%%% @author licheng5
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%%% @copyright (C) 2021, <COMPANY>
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%%% @doc
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%%%
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%%% @end
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%%% Created : 11. 1月 2021 上午12:17
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%%%-------------------------------------------------------------------
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-module(tcp_channel).
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-author("licheng5").
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-include("message.hrl").
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-behaviour(ranch_protocol).
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%% API
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-export([pub/3, jsonrpc_call/3, command/3]).
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-export([start_link/3, stop/2]).
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%% gen_server callbacks
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-export([init/3, handle_call/3, handle_cast/2, handle_info/2, code_change/3, terminate/2]).
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-record(state, {
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transport,
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socket,
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uuid :: undefined | binary(),
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%% 用户进程id
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host_pid = undefined,
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%% 发送消息对应的id
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packet_id = 1 :: integer(),
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%% 请求响应的对应关系
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inflight = #{}
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}).
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%% 向通道中写入消息
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-spec pub(Pid :: pid(), Topic :: binary(), Content :: binary()) -> no_return().
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pub(Pid, Topic, Content) when is_pid(Pid), is_binary(Topic), is_binary(Content) ->
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gen_server:cast(Pid, {pub, Topic, Content}).
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%% 向通道中写入消息
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-spec command(Pid :: pid(), CommandType :: integer(), Command :: binary()) -> no_return().
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command(Pid, CommandType, Command) when is_pid(Pid), is_integer(CommandType), is_binary(Command) ->
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gen_server:cast(Pid, {command, CommandType, Command}).
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%% 向通道中写入消息
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-spec jsonrpc_call(Pid :: pid(), ReceiverPid :: pid(), CallBin :: binary()) -> Ref :: reference().
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jsonrpc_call(Pid, ReceiverPid, CallBin) when is_pid(Pid), is_pid(ReceiverPid), is_binary(CallBin) ->
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Ref = make_ref(),
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gen_server:cast(Pid, {jsonrpc_call, ReceiverPid, Ref, CallBin}),
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Ref.
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%% 关闭方法
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-spec stop(Pid :: pid(), Reason :: any()) -> no_return().
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stop(undefined, _Reason) ->
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ok;
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stop(Pid, Reason) when is_pid(Pid) ->
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gen_server:stop(Pid, Reason, 5000).
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%% 逻辑处理方法
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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start_link(Ref, Transport, Opts) ->
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{ok, proc_lib:spawn_link(?MODULE, init, [Ref, Transport, Opts])}.
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init(Ref, Transport, _Opts = []) ->
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{ok, Socket} = ranch:handshake(Ref),
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lager:debug("[sdlan_channel] get a new connection: ~p", [Socket]),
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Transport:setopts(Socket, [binary, {active, true}, {packet, 4}]),
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% erlang:start_timer(?PING_TICKER, self(), ping_ticker),
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gen_server:enter_loop(?MODULE, [], #state{transport = Transport, socket = Socket}).
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handle_call(_Request, _From, State) ->
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{reply, ok, State}.
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%% 发送消息, 基于pub/sub机制
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handle_cast({pub, Topic, Content}, State = #state{transport = Transport, socket = Socket}) ->
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EncPub = message_codec:encode(?MESSAGE_PUB, #pub{topic = Topic, content = Content}),
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Transport:send(Socket, <<?PACKET_CAST, EncPub/binary>>),
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{noreply, State};
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%% 发送Command消息
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handle_cast({command, CommandType, Command}, State = #state{transport = Transport, socket = Socket}) ->
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EncCommand = message_codec:encode(?MESSAGE_COMMAND, #command{command_type = CommandType, command = Command}),
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Transport:send(Socket, <<?PACKET_CAST, EncCommand/binary>>),
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{noreply, State};
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%% 推送消息
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handle_cast({jsonrpc_call, ReceiverPid, Ref, CallBin}, State = #state{transport = Transport, socket = Socket, packet_id = PacketId, inflight = Inflight}) ->
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Transport:send(Socket, <<?PACKET_REQUEST, PacketId:32, CallBin/binary>>),
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{noreply, State#state{packet_id = PacketId + 1, inflight = maps:put(PacketId, {ReceiverPid, Ref}, Inflight)}}.
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%% auth验证
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handle_info({tcp, Socket, <<?PACKET_REQUEST, PacketId:32, RequestBin/binary>>}, State = #state{transport = Transport, socket = Socket}) ->
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{ok, #auth_request{ uuid = UUID, username = Username, token = Token, salt = Salt, timestamp = Timestamp}} = message_codec:decode(RequestBin),
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lager:debug("[ws_channel] auth uuid: ~p", [UUID]),
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case iot_auth:check(Username, Token, UUID, Salt, Timestamp) of
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true ->
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case host_bo:get_host_by_uuid(UUID) of
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undefined ->
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lager:warning("[ws_channel] uuid: ~p, user: ~p, host not found", [UUID, Username]),
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{stop, State};
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{ok, _} ->
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%% 尝试启动主机的服务进程
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{ok, HostPid} = iot_host_sup:ensured_host_started(UUID),
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case iot_host:attach_channel(HostPid, self()) of
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ok ->
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%% 建立到host的monitor
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erlang:monitor(process, HostPid),
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AuthReplyBin = message_codec:encode(?MESSAGE_AUTH_REPLY, #auth_reply{code = 0, payload = <<"ok">>}),
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Transport:send(Socket, <<?PACKET_RESPONSE, PacketId:32, AuthReplyBin/binary>>),
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{noreply, State#state{uuid = UUID, host_pid = HostPid}};
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{denied, Reason} when is_binary(Reason) ->
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erlang:monitor(process, HostPid),
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AuthReplyBin = message_codec:encode(?MESSAGE_AUTH_REPLY, #auth_reply{code = 1, payload = Reason}),
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Transport:send(Socket, <<?PACKET_RESPONSE, PacketId:32, AuthReplyBin/binary>>),
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lager:debug("[ws_channel] uuid: ~p, attach channel get error: ~p, stop channel", [UUID, Reason]),
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{noreply, State#state{uuid = UUID, host_pid = HostPid}};
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{error, Reason} when is_binary(Reason) ->
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AuthReplyBin = message_codec:encode(?MESSAGE_AUTH_REPLY, #auth_reply{code = 2, payload = Reason}),
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Transport:send(Socket, <<?PACKET_RESPONSE, PacketId:32, AuthReplyBin/binary>>),
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lager:debug("[ws_channel] uuid: ~p, attach channel get error: ~p, stop channel", [UUID, Reason]),
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{stop, State}
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end
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end;
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false ->
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lager:warning("[ws_channel] uuid: ~p, user: ~p, auth failed", [UUID, Username]),
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{stop, State}
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end;
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handle_info({tcp, Socket, <<?PACKET_CAST, CastBin/binary>>}, State = #state{socket = Socket, host_pid = HostPid}) when is_pid(HostPid) ->
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{ok, CastMessage} = message_codec:decode(CastBin),
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case CastMessage of
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#data{} = Data ->
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iot_host:handle(HostPid, {data, Data});
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#event{} = Event ->
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iot_host:handle(HostPid, {event, Event});
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#task_event_stream{task_id = TaskId, type = <<"close">>, stream = <<>>} ->
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iot_event_stream_observer:stream_close(TaskId);
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#task_event_stream{task_id = TaskId, type = Type, stream = Stream} ->
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lager:debug("[tcp_channel] get task_id: ~p, type: ~ts, stream: ~ts", [TaskId, Type, Stream]),
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iot_event_stream_observer:stream_data(TaskId, Type, Stream)
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end,
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{noreply, State};
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%handle_info({tcp, Socket, <<?PACKET_PING, PingData/binary>>}, State = #state{socket = Socket, host_pid = HostPid}) when is_pid(HostPid) ->
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% Ping = message_pb:decode_msg(PingData, ping),
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% iot_host:handle(HostPid, {ping, Ping}),
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% {noreply, State};
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%% 主机端的消息响应
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handle_info({tcp, Socket, <<?PACKET_RESPONSE, PacketId:32, ResponseBin/binary>>}, State = #state{socket = Socket, uuid = UUID, inflight = Inflight}) when PacketId > 0 ->
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{ok, RpcReply} = message_codec:decode(ResponseBin),
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case maps:take(PacketId, Inflight) of
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error ->
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{noreply, State};
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{{ReceiverPid, Ref}, NInflight} ->
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case is_pid(ReceiverPid) andalso is_process_alive(ReceiverPid) of
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true ->
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ReceiverPid ! {jsonrpc_reply, Ref, RpcReply};
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false ->
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lager:warning("[ws_channel] get async_call_reply message: ~p, packet_id: ~p, but receiver_pid is deaded", [RpcReply, PacketId])
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end,
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{noreply, State#state{inflight = NInflight}}
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end;
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handle_info({tcp_error, Sock, Reason}, State = #state{socket = Sock}) ->
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lager:notice("[sdlan_channel] tcp_error: ~p", [Reason]),
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{stop, normal, State};
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handle_info({tcp_closed, Sock}, State = #state{socket = Sock}) ->
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lager:notice("[sdlan_channel] tcp_closed"),
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{stop, normal, State};
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%% 关闭当前通道
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handle_info({stop, Reason}, State) ->
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{stop, Reason, State};
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%% 主机进程挂掉的时候，需要关闭掉链接
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handle_info({'DOWN', _, process, HostPid, Reason}, State = #state{uuid = UUID, host_pid = HostPid}) ->
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lager:debug("[ws_channel] uuid: ~p, channel will close because host exited with reason: ~p", [UUID, Reason]),
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{stop, State};
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handle_info(Info, State) ->
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lager:warning("[sdlan_channel] get a unknown message: ~p, channel will closed, state: ~p", [Info, State]),
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{noreply, State}.
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terminate(Reason, #state{}) ->
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lager:warning("[sdlan_channel] stop with reason: ~p", [Reason]),
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ok.
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code_change(_OldVsn, State, _Extra) ->
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{ok, State}. |