140 lines
4.6 KiB
Erlang
140 lines
4.6 KiB
Erlang
%%%-----------------------------------------------------------------------------
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%%% Copyright (c) 2012-2015 eMQTT.IO, All Rights Reserved.
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%%%
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%%% Permission is hereby granted, free of charge, to any person obtaining a copy
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%%% of this software and associated documentation files (the "Software"), to deal
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%%% in the Software without restriction, including without limitation the rights
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%%% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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%%% copies of the Software, and to permit persons to whom the Software is
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%%% furnished to do so, subject to the following conditions:
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%%%
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%%% The above copyright notice and this permission notice shall be included in all
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%%% copies or substantial portions of the Software.
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%%%
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%%% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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%%% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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%%% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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%%% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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%%% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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%%% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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%%% SOFTWARE.
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%%%-----------------------------------------------------------------------------
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%%% @doc
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%%% emqttd control.
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%%%
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%%% @end
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%%%-----------------------------------------------------------------------------
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-module(emqttd_ctl).
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-author("Feng Lee <feng@emqtt.io>").
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-include("emqttd.hrl").
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-include("emqttd_cli.hrl").
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-behaviour(gen_server).
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-define(SERVER, ?MODULE).
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%% API Function Exports
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-export([start_link/0,
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register_cmd/3,
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unregister_cmd/1,
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run/1]).
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%% gen_server Function Exports
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-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
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terminate/2, code_change/3]).
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-record(state, {seq = 0}).
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-define(CMD_TAB, mqttd_ctl_cmd).
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%%%=============================================================================
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%%% API
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%%%=============================================================================
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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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%% @doc Register a command
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%% @end
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%%------------------------------------------------------------------------------
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-spec register_cmd(atom(), {module(), atom()}, list()) -> true.
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register_cmd(Cmd, MF, Opts) ->
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gen_server:cast(?SERVER, {register_cmd, Cmd, MF, Opts}).
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%%------------------------------------------------------------------------------
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%% @doc Unregister a command
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%% @end
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%%------------------------------------------------------------------------------
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-spec unregister_cmd(atom()) -> true.
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unregister_cmd(Cmd) ->
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gen_server:cast(?SERVER, {unregister_cmd, Cmd}).
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%%------------------------------------------------------------------------------
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%% @doc Run a command
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%% @end
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%%------------------------------------------------------------------------------
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run([]) -> usage();
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run(["help"]) -> usage();
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run([CmdS|Args]) ->
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Cmd = list_to_atom(CmdS),
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case ets:match(?CMD_TAB, {{'_', Cmd}, '$1', '_'}) of
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[[{Mod, Fun}]] -> Mod:Fun(Args);
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[] -> usage()
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end.
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%%------------------------------------------------------------------------------
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%% @doc Usage
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%% @end
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%%------------------------------------------------------------------------------
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usage() ->
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?PRINT("Usage: ~s~n", [?MODULE]),
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[begin ?PRINT("~80..-s~n", [""]), Mod:Cmd(usage) end
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|| {_, {Mod, Cmd}, _} <- ets:tab2list(?CMD_TAB)].
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%%%=============================================================================
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%%% gen_server callbacks
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%%%=============================================================================
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init([]) ->
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ets:new(?CMD_TAB, [ordered_set, named_table, protected]),
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{ok, #state{seq = 0}}.
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handle_call(_Request, _From, State) ->
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{reply, ok, State}.
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handle_cast({register_cmd, Cmd, MF, Opts}, State = #state{seq = Seq}) ->
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ets:insert(?CMD_TAB, {{Seq, Cmd}, MF, Opts}),
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noreply(next_seq(State));
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handle_cast({unregister_cmd, Cmd}, State) ->
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ets:match_delete(?CMD_TAB, {{'_', Cmd}, '_', '_'}),
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noreply(State);
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handle_cast(_Msg, State) ->
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noreply(State).
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handle_info(_Info, State) ->
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noreply(State).
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terminate(_Reason, _State) ->
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ok.
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code_change(_OldVsn, State, _Extra) ->
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{ok, State}.
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%%%=============================================================================
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%%% Internal Function Definitions
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%%%=============================================================================
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noreply(State) -> {noreply, State, hibernate}.
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next_seq(State = #state{seq = Seq}) -> State#state{seq = Seq + 1}.
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