209 lines
6.1 KiB
Erlang
209 lines
6.1 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : ejabberd_zlib.erl
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%%% Author : Alexey Shchepin <alexey@process-one.net>
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%%% Purpose : Interface to zlib
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%%% Created : 19 Jan 2006 by Alexey Shchepin <alexey@process-one.net>
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%%%
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%%%
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%%% ejabberd, Copyright (C) 2002-2013 ProcessOne
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%%%
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%%% This program is free software; you can redistribute it and/or
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%%% modify it under the terms of the GNU General Public License as
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%%% published by the Free Software Foundation; either version 2 of the
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%%% License, or (at your option) any later version.
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%%%
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%%% This program is distributed in the hope that it will be useful,
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%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
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%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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%%% General Public License for more details.
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%%%
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%%% You should have received a copy of the GNU General Public License
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%%% along with this program; if not, write to the Free Software
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%%% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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%%% 02111-1307 USA
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%%%
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%%%----------------------------------------------------------------------
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-module(ejabberd_zlib).
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-author('alexey@process-one.net').
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-behaviour(gen_server).
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-export([start/0, start_link/0, enable_zlib/2,
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disable_zlib/1, send/2, recv/2, recv/3, recv_data/2,
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setopts/2, sockname/1, peername/1, get_sockmod/1,
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controlling_process/2, close/1]).
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%% Internal exports, call-back functions.
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-export([init/1, handle_call/3, handle_cast/2,
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handle_info/2, code_change/3, terminate/2]).
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-define(DEFLATE, 1).
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-define(INFLATE, 2).
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-record(zlibsock, {sockmod :: atom(),
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socket :: inet:socket(),
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zlibport :: port()}).
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-type zlib_socket() :: #zlibsock{}.
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-export_type([zlib_socket/0]).
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start() ->
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gen_server:start({local, ?MODULE}, ?MODULE, [], []).
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start_link() ->
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gen_server:start_link({local, ?MODULE}, ?MODULE, [],
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[]).
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init([]) ->
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case erl_ddll:load_driver(ejabberd:get_so_path(),
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ejabberd_zlib_drv)
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of
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ok -> ok;
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{error, already_loaded} -> ok
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end,
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Port = open_port({spawn, "ejabberd_zlib_drv"},
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[binary]),
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{ok, Port}.
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%%% --------------------------------------------------------
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%%% The call-back functions.
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%%% --------------------------------------------------------
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handle_call(_, _, State) -> {noreply, State}.
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handle_cast(_, State) -> {noreply, State}.
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handle_info({'EXIT', Port, Reason}, Port) ->
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{stop, {port_died, Reason}, Port};
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handle_info({'EXIT', _Pid, _Reason}, Port) ->
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{noreply, Port};
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handle_info(_, State) -> {noreply, State}.
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code_change(_OldVsn, State, _Extra) -> {ok, State}.
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terminate(_Reason, Port) -> Port ! {self, close}, ok.
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-spec enable_zlib(atom(), inet:socket()) -> {ok, zlib_socket()}.
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enable_zlib(SockMod, Socket) ->
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case erl_ddll:load_driver(ejabberd:get_so_path(),
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ejabberd_zlib_drv)
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of
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ok -> ok;
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{error, already_loaded} -> ok
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end,
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Port = open_port({spawn, "ejabberd_zlib_drv"},
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[binary]),
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{ok,
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#zlibsock{sockmod = SockMod, socket = Socket,
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zlibport = Port}}.
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-spec disable_zlib(zlib_socket()) -> {atom(), inet:socket()}.
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disable_zlib(#zlibsock{sockmod = SockMod,
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socket = Socket, zlibport = Port}) ->
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port_close(Port), {SockMod, Socket}.
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-spec recv(zlib_socket(), number()) -> {ok, binary()} | {error, any()}.
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recv(Socket, Length) -> recv(Socket, Length, infinity).
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-spec recv(zlib_socket(), number(), timeout()) -> {ok, binary()} |
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{error, any()}.
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recv(#zlibsock{sockmod = SockMod, socket = Socket} =
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ZlibSock,
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Length, Timeout) ->
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case SockMod:recv(Socket, Length, Timeout) of
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{ok, Packet} -> recv_data(ZlibSock, Packet);
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{error, _Reason} = Error -> Error
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end.
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-spec recv_data(zlib_socket(), iodata()) -> {ok, binary()} | {error, any()}.
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recv_data(#zlibsock{sockmod = SockMod,
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socket = Socket} =
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ZlibSock,
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Packet) ->
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case SockMod of
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gen_tcp -> recv_data2(ZlibSock, Packet);
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_ ->
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case SockMod:recv_data(Socket, Packet) of
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{ok, Packet2} -> recv_data2(ZlibSock, Packet2);
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Error -> Error
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end
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end.
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recv_data2(ZlibSock, Packet) ->
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case catch recv_data1(ZlibSock, Packet) of
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{'EXIT', Reason} -> {error, Reason};
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Res -> Res
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end.
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recv_data1(#zlibsock{zlibport = Port} = _ZlibSock,
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Packet) ->
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case port_control(Port, ?INFLATE, Packet) of
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<<0, In/binary>> -> {ok, In};
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<<1, Error/binary>> -> {error, (Error)}
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end.
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-spec send(zlib_socket(), iodata()) -> ok | {error, binary() | inet:posix()}.
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send(#zlibsock{sockmod = SockMod, socket = Socket,
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zlibport = Port},
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Packet) ->
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case port_control(Port, ?DEFLATE, Packet) of
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<<0, Out/binary>> -> SockMod:send(Socket, Out);
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<<1, Error/binary>> -> {error, (Error)}
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end.
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-spec setopts(zlib_socket(), list()) -> ok | {error, inet:posix()}.
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setopts(#zlibsock{sockmod = SockMod, socket = Socket},
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Opts) ->
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case SockMod of
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gen_tcp -> inet:setopts(Socket, Opts);
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_ -> SockMod:setopts(Socket, Opts)
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end.
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-spec sockname(zlib_socket()) -> {ok, {inet:ip_address(), inet:port_number()}} |
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{error, inet:posix()}.
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sockname(#zlibsock{sockmod = SockMod,
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socket = Socket}) ->
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case SockMod of
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gen_tcp -> inet:sockname(Socket);
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_ -> SockMod:sockname(Socket)
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end.
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-spec get_sockmod(zlib_socket()) -> atom().
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get_sockmod(#zlibsock{sockmod = SockMod}) -> SockMod.
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-spec peername(zlib_socket()) -> {ok, {inet:ip_address(), inet:port_number()}} |
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{error, inet:posix()}.
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peername(#zlibsock{sockmod = SockMod,
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socket = Socket}) ->
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case SockMod of
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gen_tcp -> inet:peername(Socket);
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_ -> SockMod:peername(Socket)
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end.
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-spec controlling_process(zlib_socket(), pid()) -> ok | {error, atom()}.
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controlling_process(#zlibsock{sockmod = SockMod,
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socket = Socket},
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Pid) ->
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SockMod:controlling_process(Socket, Pid).
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-spec close(zlib_socket()) -> true.
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close(#zlibsock{sockmod = SockMod, socket = Socket,
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zlibport = Port}) ->
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SockMod:close(Socket), port_close(Port).
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