89 lines
2.8 KiB
Erlang
89 lines
2.8 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : shaper.erl
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%%% Author : Alexey Shchepin <alexey@process-one.net>
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%%% Purpose : Functions to control connections traffic
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%%% Created : 9 Feb 2003 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(shaper).
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-author('alexey@process-one.net').
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-export([new/1, new1/1, update/2]).
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-include("ejabberd.hrl").
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-include("logger.hrl").
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-record(maxrate, {maxrate = 0 :: integer(),
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lastrate = 0.0 :: float(),
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lasttime = 0 :: integer()}).
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-type maxrate() :: none | #maxrate{}.
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-type shaper() :: maxrate() | {maxrate(), integer()}.
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-export_type([shaper/0]).
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-spec new(atom()) -> maxrate().
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new(Name) ->
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Data = ejabberd_config:get_global_option(
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{shaper, Name, global},
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fun({maxrate, R}) when is_integer(R), R>0 ->
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{maxrate, R};
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(none) ->
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none
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end, none),
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new1(Data).
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-spec new1(none | {maxrate, integer()}) -> maxrate().
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new1(none) -> none;
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new1({maxrate, MaxRate}) ->
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#maxrate{maxrate = MaxRate, lastrate = 0.0,
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lasttime = now_to_usec(now())}.
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-spec update(maxrate(), integer()) -> {maxrate(), integer()}.
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update(none, _Size) -> {none, 0};
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update(#maxrate{} = State, Size) ->
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MinInterv = 1000 * Size /
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(2 * State#maxrate.maxrate - State#maxrate.lastrate),
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Interv = (now_to_usec(now()) - State#maxrate.lasttime) /
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1000,
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?DEBUG("State: ~p, Size=~p~nM=~p, I=~p~n",
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[State, Size, MinInterv, Interv]),
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Pause = if MinInterv > Interv ->
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1 + trunc(MinInterv - Interv);
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true -> 0
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end,
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NextNow = now_to_usec(now()) + Pause * 1000,
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{State#maxrate{lastrate =
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(State#maxrate.lastrate +
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1000000 * Size / (NextNow - State#maxrate.lasttime))
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/ 2,
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lasttime = NextNow},
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Pause}.
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now_to_usec({MSec, Sec, USec}) ->
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(MSec * 1000000 + Sec) * 1000000 + USec.
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