%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2011. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%%
%% %CopyrightEnd%
%%
-module(overload_SUITE).
-include_lib("common_test/include/ct.hrl").
-compile(export_all).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
all() -> [info, set_config_data, set_env_vars, request, timeout].
init_per_testcase(_Case,Config) ->
restart_sasl(),
Config.
end_per_testcase(Case,Config) ->
try apply(?MODULE,Case,[cleanup,Config])
catch error:undef -> ok
end,
ok.
%%%-----------------------------------------------------------------
info(_Config) ->
Info = overload:get_overload_info(),
[{total_intensity,0.0},
{accept_intensity,0.0},
{max_intensity,0.8},
{weight,0.1},
{total_requests,0},
{accepted_requests,0}] = Info.
%%%-----------------------------------------------------------------
set_config_data(_Config) ->
InfoDefault = overload:get_overload_info(),
ok = check_info(0.8,0.1,InfoDefault),
ok = overload:set_config_data(0.5,0.4),
Info1 = overload:get_overload_info(),
ok = check_info(0.5,0.4,Info1),
ok.
%%%-----------------------------------------------------------------
set_env_vars(_Config) ->
InfoDefault = overload:get_overload_info(),
ok = check_info(0.8,0.1,InfoDefault),
ok = application:set_env(sasl,overload_max_intensity,0.5),
ok = application:set_env(sasl,overload_weight,0.4),
ok = application:stop(sasl),
ok = application:start(sasl),
Info1 = overload:get_overload_info(),
ok = check_info(0.5,0.4,Info1),
ok.
set_env_vars(cleanup,_Config) ->
application:unset_env(sasl,overload_max_intensity),
application:unset_env(sasl,overload_weight),
ok.
%%%-----------------------------------------------------------------
request(_Config) ->
%% Find number of request that can be done with default settings
%% and no delay
overload:set_config_data(0.8, 0.1),
NDefault = do_many_requests(0),
restart_sasl(),
?t:format("NDefault: ~p",[NDefault]),
%% Check that the number of requests increases when max_intensity
%% increases
overload:set_config_data(2, 0.1),
NLargeMI = do_many_requests(0),
restart_sasl(),
?t:format("NLargeMI: ~p",[NLargeMI]),
true = NLargeMI > NDefault,
%% Check that the number of requests decreases when weight
%% increases
overload:set_config_data(0.8, 1),
NLargeWeight = do_many_requests(0),
restart_sasl(),
?t:format("NLargeWeight: ~p",[NLargeWeight]),
true = NLargeWeight < NDefault,
%% Check that number of requests increases when delay between
%% requests increases.
%% (Keeping same config and comparing to large weight in order to
%% minimize the time needed for this case.)
overload:set_config_data(0.8, 1),
NLargeTime = do_many_requests(500),
restart_sasl(),
?t:format("NLargeTime: ~p",[NLargeTime]),
true = NLargeTime > NLargeWeight,
ok.
%%%-----------------------------------------------------------------
timeout(_Config) ->
overload:set_config_data(0.8, 1),
_N = do_many_requests(0),
%% Check that the overload alarm is raised
[{overload,_}] = alarm_handler:get_alarms(),
%% Fake a clear timeout in overload.erl and check that, since it
%% came very soon after the overload situation, the alarm is not
%% cleared
overload ! timeout,
timer:sleep(1000),
[{overload,_}] = alarm_handler:get_alarms(),
%% A bit later, try again and check that this time the alarm is
%% cleared
overload ! timeout,
timer:sleep(1000),
[] = alarm_handler:get_alarms(),
ok.
%%%-----------------------------------------------------------------
%%% INTERNAL FUNCTIONS
%%%-----------------------------------------------------------------
%%% Call overload:request/0 up to 30 times with the given time delay
%%% between. Stop when 'reject' is returned.
do_many_requests(T) ->
30 - do_requests(30,T).
do_requests(0,_) ->
?t:fail(never_rejected);
do_requests(N,T) ->
case overload:request() of
accept ->
timer:sleep(T),
do_requests(N-1,T);
reject ->
N
end.
%%%-----------------------------------------------------------------
%%% Restart the sasl application
restart_sasl() ->
application:stop(sasl),
application:start(sasl),
ok.
%%%-----------------------------------------------------------------
%%% Check that max_intensity and weight is set as expected
check_info(MI,W,Info) ->
case {lists:keyfind(max_intensity,1,Info), lists:keyfind(weight,1,Info)} of
{{_,MI},{_,W}} -> ok;
_ -> ?t:fail({unexpected_info,MI,W,Info})
end.
