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authorSiri Hansen <[email protected]>2018-04-24 14:26:31 +0200
committerSiri Hansen <[email protected]>2018-04-26 14:37:30 +0200
commit0deea4a8f369013ec00e231d0c2c37e4ab3f0ba1 (patch)
tree054b8465a9eb07b07fde4596f2209ee1df689a92 /lib/kernel/src/logger_backend.erl
parent0183ddffb112d898d9b8c0396afa7f2210b9e169 (diff)
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Add logger
Diffstat (limited to 'lib/kernel/src/logger_backend.erl')
-rw-r--r--lib/kernel/src/logger_backend.erl133
1 files changed, 133 insertions, 0 deletions
diff --git a/lib/kernel/src/logger_backend.erl b/lib/kernel/src/logger_backend.erl
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+%%
+%% %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).