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%% Copyright (c) 2011-2012 Basho Technologies, Inc. All Rights Reserved.
%%
%% This file is provided to you under the Apache License,
%% Version 2.0 (the "License"); you may not use this file
%% except in compliance with the License. You may obtain
%% a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing,
%% software distributed under the License is distributed on an
%% "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
%% KIND, either express or implied. See the License for the
%% specific language governing permissions and limitations
%% under the License.
-define(DEFAULT_TRUNCATION, 4096).
-define(DEFAULT_TRACER, lager_default_tracer).
-define(DEFAULT_SINK, lager_event).
-define(ERROR_LOGGER_SINK, error_logger_lager_event).
-define(LEVELS,
[debug, info, notice, warning, error, critical, alert, emergency, none]).
%% Use of these "functions" means that the argument list will not be
%% truncated for safety
-define(LEVELS_UNSAFE,
[{debug_unsafe, debug}, {info_unsafe, info}, {notice_unsafe, notice}, {warning_unsafe, warning}, {error_unsafe, error}, {critical_unsafe, critical}, {alert_unsafe, alert}, {emergency_unsafe, emergency}]).
-define(DEBUG, 128).
-define(INFO, 64).
-define(NOTICE, 32).
-define(WARNING, 16).
-define(ERROR, 8).
-define(CRITICAL, 4).
-define(ALERT, 2).
-define(EMERGENCY, 1).
-define(LOG_NONE, 0).
-define(LEVEL2NUM(Level),
case Level of
debug -> ?DEBUG;
info -> ?INFO;
notice -> ?NOTICE;
warning -> ?WARNING;
error -> ?ERROR;
critical -> ?CRITICAL;
alert -> ?ALERT;
emergency -> ?EMERGENCY
end).
-define(NUM2LEVEL(Num),
case Num of
?DEBUG -> debug;
?INFO -> info;
?NOTICE -> notice;
?WARNING -> warning;
?ERROR -> error;
?CRITICAL -> critical;
?ALERT -> alert;
?EMERGENCY -> emergency
end).
-define(SHOULD_LOG(Sink, Level),
(lager_util:level_to_num(Level) band element(1, lager_config:get({Sink, loglevel}, {?LOG_NONE, []}))) /= 0).
-define(SHOULD_LOG(Level),
(lager_util:level_to_num(Level) band element(1, lager_config:get(loglevel, {?LOG_NONE, []}))) /= 0).
-define(NOTIFY(Level, Pid, Format, Args),
gen_event:notify(lager_event, {log, lager_msg:new(io_lib:format(Format, Args),
Level,
[{pid,Pid},{line,?LINE},{file,?FILE},{module,?MODULE}],
[])}
)).
%% FOR INTERNAL USE ONLY
%% internal non-blocking logging call
%% there's some special handing for when we try to log (usually errors) while
%% lager is still starting.
-ifdef(TEST).
-define(INT_LOG(Level, Format, Args),
case ?SHOULD_LOG(Level) of
true ->
?NOTIFY(Level, self(), Format, Args);
_ ->
ok
end).
-else.
-define(INT_LOG(Level, Format, Args),
Self = self(),
%% do this in a spawn so we don't cause a deadlock calling gen_event:which_handlers
%% from a gen_event handler
spawn(fun() ->
case catch(gen_event:which_handlers(lager_event)) of
X when X == []; X == {'EXIT', noproc}; X == [lager_backend_throttle] ->
%% there's no handlers yet or lager isn't running, try again
%% in half a second.
timer:sleep(500),
?NOTIFY(Level, Self, Format, Args);
_ ->
case ?SHOULD_LOG(Level) of
true ->
?NOTIFY(Level, Self, Format, Args);
_ ->
ok
end
end
end)).
-endif.
-record(lager_shaper, {
%% how many messages per second we try to deliver
hwm = undefined :: 'undefined' | pos_integer(),
%% how many messages we've received this second
mps = 0 :: non_neg_integer(),
%% the current second
lasttime = os:timestamp() :: erlang:timestamp(),
%% count of dropped messages this second
dropped = 0 :: non_neg_integer()
}).
-type lager_shaper() :: #lager_shaper{}.