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tr_server.erl
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tr_server.erl
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%%%-------------------------------------------------------------------
%%% @author Jonathan Valencia <jonathanv.espitia@gmail.com>
%%% @copyright (C) 2015, bitatomy
%%% @doc This module defines a server process that listens for incoming
%%% TCP connections and allows the user to execute commands via
%%% that TCP stream
%%% @end
%%%-------------------------------------------------------------------
-module(tr_server).
-behaviour(gen_server).
%% API
-export([start_link/0, start_link/1, get_count/0, stop/0]).
%% gen_server callbacks
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-define(SERVER, ?MODULE).
-define(DEFAULT_PORT, 1055).
-record(state, {port, lsock, request_count = 0}).
%%%===================================================================
%%% API
%%%===================================================================
%%--------------------------------------------------------------------
%% @doc
%% Starts the server
%%
%% @spec start_link() -> {ok, Pid} | ignore | {error, Error}
%% @end
%%--------------------------------------------------------------------
start_link() ->
gen_server:start_link({local, ?SERVER}, ?MODULE, [], []).
%%--------------------------------------------------------------------
%% @doc
%% Starts the tcp rpc server
%%
%% @spec start_link(Port) -> {ok, Pid} | ignore | {error, Error}
%% where
%% Port = integer(),
%% Pid = pid()
%% @end
%%--------------------------------------------------------------------
start_link(Port) ->
gen_server:start_link({local, ?SERVER}, ?MODULE, [Port], []).
%%--------------------------------------------------------------------
%% @doc
%% Returns the number of requests made to this server
%%
%% @spec get_count() -> {ok, Count}
%% where
%% Count = integer()
%% @end
%%--------------------------------------------------------------------
get_count() ->
gen_server:call(?SERVER, get_count).
%%--------------------------------------------------------------------
%% @doc
%% Stops the server
%%
%% @spec stop() -> ok
%% @end
%%--------------------------------------------------------------------
stop() ->
gen_server:cast(?SERVER, stop).
%%%===================================================================
%%% gen_server callbacks
%%%===================================================================
%%--------------------------------------------------------------------
%% @private
%% @doc
%% Initializes the server
%%
%% @spec init(Args) -> {ok, State} |
%% {ok, State, Timeout} |
%% ignore |
%% {stop, Reason}
%% @end
%%--------------------------------------------------------------------
init([Port]) ->
{ok, LSock} = gen_tcp:listen(Port, [{active, true}]),
{ok, #state{port = Port, lsock = LSock}, 0}.
%%--------------------------------------------------------------------
%% @private
%% @doc
%% Handling call messages
%% Sync Messages
%% @spec handle_call(Request, From, State) ->
%% {reply, Reply, State} |
%% {reply, Reply, State, Timeout} |
%% {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, Reply, State} |
%% {stop, Reason, State}
%% @end
%%--------------------------------------------------------------------
handle_call(get_count, _From, State) ->
{reply, {ok, State#state.request_count}, State}.
%%--------------------------------------------------------------------
%% @private
%% @doc
%% Handling cast messages
%% Async Messages
%% @spec handle_cast(Msg, State) -> {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, State}
%% @end
%%--------------------------------------------------------------------
handle_cast(stop, State) ->
{stop, ok,State}.
%%--------------------------------------------------------------------
%% @private
%% @doc
%% Handling all non call/cast messages
%% Such as timeouts, tcp, udp streams
%% @spec handle_info(Info, State) -> {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, State}
%% @end
%%--------------------------------------------------------------------
handle_info({tcp, Socket, RawData}, State) ->
RequestCount = State#state.request_count,
try
MFA = re:replace(RawData, "\r\n$", "", [{return, list}]),
{match, [M, F, A]} =
re:run(MFA,
"(.*):(.*)\s*\\((.*)\s*\\)\s*.\s*$",
[{capture, [1,2,3], list}, ungreedy]),
Result = apply(list_to_atom(M), list_to_atom(F), args_to_terms(A)),
gen_tcp:send(Socket, io_lib:fwrite("~p~n", [Result]))
catch
_C:E ->
gen_tcp:send(Socket, io_lib:fwrite("~p~n", [E]))
end,
{noreply, State#state{request_count = RequestCount + 1}};
handle_info(timeout, #state{lsock = LSock} = State) ->
{ok, _Sock} = gen_tcp:accept(LSock),
{noreply, State}.
%%--------------------------------------------------------------------
%% @private
%% @doc
%% This function is called by a gen_server when it is about to
%% terminate. It should be the opposite of Module:init/1 and do any
%% necessary cleaning up. When it returns, the gen_server terminates
%% with Reason. The return value is ignored.
%%
%% @spec terminate(Reason, State) -> void()
%% @end
%%--------------------------------------------------------------------
terminate(_Reason, _State) ->
ok.
%%--------------------------------------------------------------------
%% @private
%% @doc
%% Convert process state when code is changed
%%
%% @spec code_change(OldVsn, State, Extra) -> {ok, NewState}
%% @end
%%--------------------------------------------------------------------
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%%%===================================================================
%%% Internal functions
%%%===================================================================
args_to_terms([]) ->
[];
args_to_terms(RawArgs) ->
{ok, Toks, _Line} = erl_scan:string("[" ++ RawArgs ++ "]. ", 1),
{ok, Args} = erl_parse:parse_term(Toks),
Args.