%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2017. All Rights Reserved.
%%
%% Licensed 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.
%%
%% %CopyrightEnd%
%%
-module(logger_backend).
-export([log_allowed/2]).
-include("logger_internal.hrl").
-define(OWN_KEYS,[level,filters,filter_default,handlers]).
%%%-----------------------------------------------------------------
%%% The default logger backend
log_allowed(Log, Tid) ->
{ok,Config} = logger_config:get(Tid,logger),
Filters = maps:get(filters,Config,[]),
case apply_filters(logger,Log,Filters,Config) of
stop ->
ok;
Log1 ->
Handlers = maps:get(handlers,Config,[]),
call_handlers(Log1,Handlers,Tid)
end,
ok.
call_handlers(#{level:=Level}=Log,[Id|Handlers],Tid) ->
case logger_config:get(Tid,Id,Level) of
{ok,{Module,Config}} ->
Filters = maps:get(filters,Config,[]),
case apply_filters(Id,Log,Filters,Config) of
stop ->
ok;
Log1 ->
Config1 = maps:without(?OWN_KEYS,Config),
try Module:log(Log1,Config1)
catch C:R:S ->
case logger:remove_handler(Id) of
ok ->
logger:internal_log(
error,{removed_failing_handler,Id}),
?LOG_INTERNAL(
debug,
[{logger,removed_failing_handler},
{handler,{Id,Module}},
{log,Log1},
{config,Config1},
{reason,{C,R,filter_stacktrace(S)}}]);
{error,{not_found,_}} ->
%% Probably already removed by other client
%% Don't report again
ok;
{error,Reason} ->
?LOG_INTERNAL(
debug,
[{logger,remove_handler_failed},
{reason,Reason}])
end
end
end;
_ ->
ok
end,
call_handlers(Log,Handlers,Tid);
call_handlers(_Log,[],_Tid) ->
ok.
apply_filters(Owner,Log,Filters,Config) ->
case do_apply_filters(Owner,Log,Filters,ignore) of
stop ->
stop;
ignore ->
case maps:get(filter_default,Config) of
log ->
Log;
stop ->
stop
end;
Log1 ->
Log1
end.
do_apply_filters(Owner,Log,[{_Id,{FilterFun,FilterArgs}}=Filter|Filters],State) ->
try FilterFun(Log,FilterArgs) of
stop ->
stop;
ignore ->
do_apply_filters(Owner,Log,Filters,State);
Log1=#{level:=Level,msg:=Msg,meta:=Meta}
when is_atom(Level), ?IS_MSG(Msg), is_map(Meta) ->
do_apply_filters(Owner,Log1,Filters,log);
Bad ->
handle_filter_failed(Filter,Owner,Log,{bad_return_value,Bad})
catch C:R:S ->
handle_filter_failed(Filter,Owner,Log,{C,R,filter_stacktrace(S)})
end;
do_apply_filters(_Owner,_Log,[],ignore) ->
ignore;
do_apply_filters(_Owner,Log,[],log) ->
Log.
handle_filter_failed({Id,_}=Filter,Owner,Log,Reason) ->
case logger_server:remove_filter(Owner,Id) of
ok ->
logger:internal_log(error,{removed_failing_filter,Id}),
?LOG_INTERNAL(debug,
[{logger,removed_failing_filter},
{filter,Filter},
{owner,Owner},
{log,Log},
{reason,Reason}]);
_ ->
ok
end,
ignore.
filter_stacktrace(Stacktrace) ->
logger:filter_stacktrace(?MODULE,Stacktrace).
