From 0deea4a8f369013ec00e231d0c2c37e4ab3f0ba1 Mon Sep 17 00:00:00 2001
From: Siri Hansen <siri@erlang.org>
Date: Tue, 24 Apr 2018 14:26:31 +0200
Subject: Add logger

---
 lib/kernel/src/logger_config.erl | 151 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 151 insertions(+)
 create mode 100644 lib/kernel/src/logger_config.erl

(limited to 'lib/kernel/src/logger_config.erl')

diff --git a/lib/kernel/src/logger_config.erl b/lib/kernel/src/logger_config.erl
new file mode 100644
index 0000000000..799aea9617
--- /dev/null
+++ b/lib/kernel/src/logger_config.erl
@@ -0,0 +1,151 @@
+%%
+%% %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_config).
+
+-export([new/1,delete/2,
+         exist/2,
+         allow/2,allow/3,
+         get/2, get/3, get/1,
+         create/3, create/4, set/3,
+         set_module_level/3,reset_module_level/2,
+         cache_module_level/2,
+         level_to_int/1]).
+
+-include("logger_internal.hrl").
+
+new(Name) ->
+    _ = ets:new(Name,[set,protected,named_table]),
+    ets:whereis(Name).
+
+delete(Tid,Id) ->
+    ets:delete(Tid,table_key(Id)).
+
+allow(Tid,Level,Module) ->
+    LevelInt = level_to_int(Level),
+    case ets:lookup(Tid,Module) of
+        [{Module,{ModLevel,cached}}] when is_integer(ModLevel),
+                                          LevelInt =< ModLevel ->
+            true;
+        [{Module,ModLevel}] when is_integer(ModLevel),
+                                 LevelInt =< ModLevel ->
+            true;
+        [] ->
+            logger_server:cache_module_level(Module),
+            allow(Tid,Level);
+        _ ->
+            false
+    end.
+
+allow(Tid,Level) ->
+    GlobalLevelInt = ets:lookup_element(Tid,?LOGGER_KEY,2),
+    level_to_int(Level) =< GlobalLevelInt.
+
+exist(Tid,What) ->
+    ets:member(Tid,table_key(What)).
+
+get(Tid,What) ->
+    case ets:lookup(Tid,table_key(What)) of
+        [{_,_,Config}] ->
+            {ok,Config};
+        [{_,_,Config,Module}] ->
+            {ok,{Module,Config}};
+        [] ->
+            {error,{not_found,What}}
+    end.
+
+get(Tid,What,Level) ->
+    MS = [{{table_key(What),'$1','$2'}, % logger config
+           [{'>=','$1',level_to_int(Level)}],
+           ['$2']},
+          {{table_key(What),'$1','$2','$3'}, % handler config
+           [{'>=','$1',level_to_int(Level)}],
+           [{{'$3','$2'}}]}],
+    case ets:select(Tid,MS) of
+        [] -> error;
+        [Data] -> {ok,Data}
+    end.
+
+create(Tid,What,Module,Config) ->
+    LevelInt = level_to_int(maps:get(level,Config)),
+    ets:insert(Tid,{table_key(What),LevelInt,Config,Module}).
+create(Tid,What,Config) ->
+    LevelInt = level_to_int(maps:get(level,Config)),
+    ets:insert(Tid,{table_key(What),LevelInt,Config}).
+
+set(Tid,What,Config) ->
+    LevelInt = level_to_int(maps:get(level,Config)),
+    %% Should do this only if the level has actually changed. Possibly
+    %% overwrite instead of delete?
+    case What of
+        logger ->
+            _ = ets:select_delete(Tid,[{{'_',{'$1',cached}},
+                                        [{'=/=','$1',LevelInt}],
+                                        [true]}]),
+            ok;
+        _ ->
+            ok
+    end,
+    ets:update_element(Tid,table_key(What),[{2,LevelInt},{3,Config}]),
+    ok.
+
+set_module_level(Tid,Module,Level) ->
+    ets:insert(Tid,{Module,level_to_int(Level)}),
+    ok.
+
+reset_module_level(Tid,Module) ->
+    ets:delete(Tid,Module), % should possibley overwrite instead of delete?
+    ok.
+
+cache_module_level(Tid,Module) ->
+    GlobalLevelInt = ets:lookup_element(Tid,?LOGGER_KEY,2),
+    ets:insert_new(Tid,{Module,{GlobalLevelInt,cached}}),
+    ok.
+
+get(Tid) ->
+    {ok,Logger} = get(Tid,logger),
+    HMS = [{{table_key('$1'),'_','$2','$3'},[],[{{'$1','$3','$2'}}]}],
+    Handlers = ets:select(Tid,HMS),
+    MMS = [{{'$1','$2'},[{is_atom,'$1'},{is_integer,'$2'}],[{{'$1','$2'}}]}],
+    Modules = ets:select(Tid,MMS),
+    {Logger,Handlers,[{M,int_to_level(L)} || {M,L} <- Modules]}.
+
+level_to_int(emergency) -> ?EMERGENCY;
+level_to_int(alert) -> ?ALERT;
+level_to_int(critical) -> ?CRITICAL;
+level_to_int(error) -> ?ERROR;
+level_to_int(warning) -> ?WARNING;
+level_to_int(notice) -> ?NOTICE;
+level_to_int(info) -> ?INFO;
+level_to_int(debug) -> ?DEBUG.
+
+int_to_level(?EMERGENCY) -> emergency;
+int_to_level(?ALERT) -> alert;
+int_to_level(?CRITICAL) -> critical;
+int_to_level(?ERROR) -> error;
+int_to_level(?WARNING) -> warning;
+int_to_level(?NOTICE) -> notice;
+int_to_level(?INFO) -> info;
+int_to_level(?DEBUG) -> debug.
+
+%%%-----------------------------------------------------------------
+%%% Internal
+
+table_key(logger) -> ?LOGGER_KEY;
+table_key(HandlerId) -> {?HANDLER_KEY,HandlerId}.
-- 
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