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|
%%%----------------------------------------------------------------------
%%% File : ejabberd_zlib.erl
%%% Author : Alexey Shchepin <alexey@sevcom.net>
%%% Purpose : Interface to zlib
%%% Created : 19 Jan 2006 by Alexey Shchepin <alexey@sevcom.net>
%%% Id : $Id$
%%%----------------------------------------------------------------------
-module(ejabberd_zlib).
-author('alexey@sevcom.net').
-behaviour(gen_server).
-export([start/0, start_link/0,
enable_zlib/2, disable_zlib/1,
send/2,
recv/2, recv/3, recv_data/2,
setopts/2,
sockname/1, peername/1,
controlling_process/2,
close/1]).
%% Internal exports, call-back functions.
-export([init/1,
handle_call/3,
handle_cast/2,
handle_info/2,
code_change/3,
terminate/2]).
-define(DEFLATE, 1).
-define(INFLATE, 2).
-record(zlibsock, {sockmod, socket, zlibport}).
start() ->
gen_server:start({local, ?MODULE}, ?MODULE, [], []).
start_link() ->
gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
init([]) ->
case erl_ddll:load_driver(ejabberd:get_so_path(), ejabberd_zlib_drv) of
ok -> ok;
{error, already_loaded} -> ok
end,
Port = open_port({spawn, ejabberd_zlib_drv}, [binary]),
{ok, Port}.
%%% --------------------------------------------------------
%%% The call-back functions.
%%% --------------------------------------------------------
handle_call(_, _, State) ->
{noreply, State}.
handle_cast(_, State) ->
{noreply, State}.
handle_info({'EXIT', Port, Reason}, Port) ->
{stop, {port_died, Reason}, Port};
handle_info({'EXIT', _Pid, _Reason}, Port) ->
{noreply, Port};
handle_info(_, State) ->
{noreply, State}.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
terminate(_Reason, Port) ->
Port ! {self, close},
ok.
enable_zlib(SockMod, Socket) ->
case erl_ddll:load_driver(ejabberd:get_so_path(), ejabberd_zlib_drv) of
ok -> ok;
{error, already_loaded} -> ok
end,
Port = open_port({spawn, ejabberd_zlib_drv}, [binary]),
{ok, #zlibsock{sockmod = SockMod, socket = Socket, zlibport = Port}}.
disable_zlib(#zlibsock{sockmod = SockMod, socket = Socket, zlibport = Port}) ->
port_close(Port),
{SockMod, Socket}.
recv(Socket, Length) ->
recv(Socket, Length, infinity).
recv(#zlibsock{sockmod = SockMod, socket = Socket} = ZlibSock,
Length, Timeout) ->
case SockMod:recv(Socket, Length, Timeout) of
{ok, Packet} ->
recv_data(ZlibSock, Packet);
{error, _Reason} = Error ->
Error
end.
recv_data(#zlibsock{zlibport = Port} = _ZlibSock, Packet) ->
case port_control(Port, ?INFLATE, Packet) of
<<0, In/binary>> ->
{ok, In};
<<1, Error/binary>> ->
{error, binary_to_list(Error)}
end.
send(#zlibsock{sockmod = SockMod, socket = Socket, zlibport = Port},
Packet) ->
case port_control(Port, ?DEFLATE, Packet) of
<<0, Out/binary>> ->
SockMod:send(Socket, Out);
<<1, Error/binary>> ->
{error, binary_to_list(Error)}
end.
setopts(#zlibsock{sockmod = SockMod, socket = Socket}, Opts) ->
case SockMod of
gen_tcp ->
inet:setopts(Socket, Opts);
_ ->
SockMod:setopts(Socket, Opts)
end.
sockname(#zlibsock{sockmod = SockMod, socket = Socket}) ->
case SockMod of
gen_tcp ->
inet:sockname(Socket);
_ ->
SockMod:sockname(Socket)
end.
peername(#zlibsock{sockmod = SockMod, socket = Socket}) ->
case SockMod of
gen_tcp ->
inet:peername(Socket);
_ ->
SockMod:peername(Socket)
end.
controlling_process(#zlibsock{sockmod = SockMod, socket = Socket}, Pid) ->
SockMod:controlling_process(Socket, Pid).
close(#zlibsock{sockmod = SockMod, socket = Socket, zlibport = Port}) ->
SockMod:close(Socket),
port_close(Port).
|
