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%%%
%%% Copyright 2010 © ProcessOne
%%%
%%% Author : Eric Cestari <ecestari@mac.com>
%%%
%%% This program is free software; you can redistribute it and/or modify
%%% it under the terms of the GNU General Public License as published by
%%% the Free Software Foundation; either version 2 of the License, or
%%% (at your option) any later version.
%%%
%%% This program is distributed in the hope that it will be useful,
%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
%%% GNU General Public License for more details.
%%%
%%% You should have received a copy of the GNU General Public License
%%% along with this program; if not, write to the Free Software
%%% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
%%%
%%% In addition, as a special exception, you have the permission to
%%% link the code of this program with any library released under
%%% the EPL license and distribute linked combinations including
%%% the two; the MPL (Mozilla Public License), which EPL (Erlang
%%% Public License) is based on, is included in this exception.
-module (ts_server_websocket).
-export([ connect/3, send/3, close/1, set_opts/2, protocol_options/1,
normalize_incomming_data/2 ]).
-behaviour(gen_ts_transport).
-include("ts_profile.hrl").
-include("ts_config.hrl").
-include("ts_websocket.hrl").
-record(state, {parent, socket = none, accept, host, port, path, opts, version,
frame, buffer = <<>>, state = not_connected, subprotos = []}).
-record(ws_config, {path, version = "13", frame}).
protocol_options(#proto_opts{tcp_rcv_size = Rcv, tcp_snd_size = Snd,
websocket_path = Path, websocket_frame = Frame}) ->
[#ws_config{path = Path, frame = Frame},
binary,
{active, once},
{recbuf, Rcv},
{sndbuf, Snd},
{keepalive, true} %% FIXME: should be an option
].
connect(Host, Port, Opts) ->
Parent = self(),
[WSConfig | TcpOpts] = Opts,
Path = WSConfig#ws_config.path,
Version = WSConfig#ws_config.version,
Frame = WSConfig#ws_config.frame,
case gen_tcp:connect(Host, Port, opts_to_tcp_opts(TcpOpts)) of
{ok, Socket} ->
Pid = spawn_link(
fun() ->
loop(#state{parent = Parent, host = Host, port = Port,
opts = TcpOpts, path = Path, version = Version,
frame = Frame, socket = Socket})
end),
gen_tcp:controlling_process(Socket, Pid),
inet:setopts(Socket, [{active, once}]),
{ok, Pid};
Ret ->
Ret
end.
loop(#state{socket = Socket, host = Host, path = Path,
version = Version, subprotos = SubProtocol,
state = not_connected} = State)->
{Handshake, Accept} = websocket:get_handshake(Host, Path, SubProtocol, Version),
gen_tcp:send(Socket, Handshake),
loop(State#state{socket = Socket, accept = Accept,
state = waiting_handshake});
loop(#state{parent = Parent, socket = Socket, accept = Accept,
state = waiting_handshake} = State)->
receive
{tcp, Socket, Data}->
CheckResult = websocket:check_handshake(Data, Accept),
case CheckResult of
ok ->
?Debug("handshake success: ~n"),
inet:setopts(Socket, [{active, once}]),
loop(State#state{state = connected});
{error, Reason} ->
?DebugF("handshake fail: ~p~n", [Reason]),
Parent ! {gen_ts_transport, self(), error, Reason}
end;
{tcp_closed, Socket}->
?LOGF("tcp closed:~p~n", [Socket], ?ERR),
Parent ! {gen_ts_transport, self(), closed};
{tcp_error, Socket, Error}->
?LOGF("tcp error:~p~n", [Socket], ?ERR),
Parent ! {gen_ts_transport, self(), error, Error}
end;
loop(#state{parent = Parent, socket = Socket, state = connected,
buffer = Buffer, frame = Frame} = State)->
receive
{send, Data, Ref} ->
EncodedData = case Frame of
"text" -> websocket:encode_text(Data);
_ -> websocket:encode_binary(Data)
end,
gen_tcp:send(Socket, EncodedData),
Parent ! {ok, Ref},
loop(State);
close ->
EncodedData = websocket:encode_close(<<"close">>),
gen_tcp:send(Socket, EncodedData),
gen_tcp:close(Socket);
{set_opts, Opts} ->
inet:setopts(Socket, Opts),
loop(State);
{tcp, Socket, Data}->
case websocket:decode(<<Buffer/binary, Data/binary>>) of
more ->
?DebugF("receive incomplete from server: ~p~n", [Data]),
loop(State#state{buffer = <<Buffer/binary, Data/binary>>});
{?OP_CLOSE, _Reason, _} ->
?DebugF("receive close from server: ~p~n", [_Reason]),
Parent ! {gen_ts_transport, self(), closed};
{_Opcode, Payload, Left} ->
?DebugF("receive from server: ~p ~p~n", [_Opcode, Payload]),
Parent ! {gen_ts_transport, self(), Payload},
loop(State#state{buffer = Left})
end;
{tcp_closed, Socket}->
Parent ! {gen_ts_transport, self(), closed};
{tcp_error, Socket, Error}->
Parent ! {gen_ts_transport, self(), error, Error};
E -> ?LOGF("Message:~p~n", [E], ?WARN)
end.
opts_to_tcp_opts(Opts) -> Opts.
%% send/3 -> ok | {error, Reason}
send(Socket, Data, _Opts) ->
?DebugF("sending to server: ~p~n",[Data]),
Ref = make_ref(),
Socket ! {send, Data, Ref},
MonitorRef = erlang:monitor(process,Socket),
receive
{'DOWN', MonitorRef, _Type, _Object, _Info} ->
{error, no_ws_connection};
{ok, Ref} ->
erlang:demonitor(MonitorRef),
ok
after
30000 ->
erlang:demonitor(MonitorRef),
{error, timeout}
end.
close(Socket) ->
Socket ! close.
%% set_opts/2 -> socket()
set_opts(Socket, Opts) ->
Socket ! {set_opts, Opts},
Socket.
normalize_incomming_data(_Socket, X) ->
%% nothing to do here, ts_websocket uses a special process to handle
%%http requests,the incoming data is already delivered to
%%ts_client as {gen_ts_transport, ..} instead of gen_tcp | ssl
X.
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