%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2010-2016. 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%
%%
%%----------------------------------------------------------------------
%% Purpose: This is a simple logger utility for the HDLT toolkit.
%% It assumesd that the debug level and the "name" of the
%% logging entity has been put in process environment
%% (using the set_level and set_name functions respectively).
%%----------------------------------------------------------------------
%%
-module(hdlt_logger).
-export([
start/0,
set_level/1, get_level/0, set_name/1,
info/2, log/2, debug/2
]).
-export([logger/1]).
-define(LOGGER, ?MODULE).
-define(MSG, hdlt_logger_msg).
-define(LEVEL, hdlt_logger_level).
-define(NAME, hdlt_logger_name).
-define(INFO_STR, "INFO").
-define(LOG_STR, "LOG ").
-define(DEBUG_STR, "DBG ").
start() ->
Self = self(),
proc_lib:start(?MODULE, logger, [Self]).
set_name(Name) when is_list(Name) ->
put(?NAME, Name),
ok.
get_level() ->
get(?LEVEL).
set_level(Level) ->
case lists:member(Level, [silence, info, log, debug]) of
true ->
put(?LEVEL, Level),
ok;
false ->
erlang:error({bad_debug_level, Level})
end.
info(F, A) ->
%% io:format("info -> " ++ F ++ "~n", A),
do_log(info, get(?LEVEL), F, A).
log(F, A) ->
%% io:format("log -> " ++ F ++ "~n", A),
do_log(log, get(?LEVEL), F, A).
debug(F, A) ->
%% io:format("debug -> " ++ F ++ "~n", A),
do_log(debug, get(?LEVEL), F, A).
logger(Parent) ->
global:register_name(?LOGGER, self()),
Ref = erlang:monitor(process, Parent),
proc_lib:init_ack(self()),
logger_loop(Ref).
logger_loop(Ref) ->
receive
{?MSG, F, A} ->
io:format(F, A),
logger_loop(Ref);
{'DOWN', Ref, process, _Object, _Info} ->
%% start the stop timer
erlang:send_after(timer:seconds(5), self(), stop),
logger_loop(undefined);
stop ->
global:unregister_name(?LOGGER),
ok
end.
formated_timestamp() ->
{Date, Time} = erlang:localtime(),
{YYYY,MM,DD} = Date,
{Hour,Min,Sec} = Time,
FormatDate =
io_lib:format("~.4w-~.2.0w-~.2.0w ~.2.0w:~.2.0w:~.2.0w",
[YYYY,MM,DD,Hour,Min,Sec]),
lists:flatten(FormatDate).
do_log(_, silence, _, _) ->
ok;
do_log(info, info, F, A) ->
do_log(?INFO_STR, F, A);
do_log(info, log, F, A) ->
do_log(?INFO_STR, F, A);
do_log(log, log, F, A) ->
do_log(?LOG_STR, F, A);
do_log(info, debug, F, A) ->
do_log(?INFO_STR, F, A);
do_log(log, debug, F, A) ->
do_log(?LOG_STR, F, A);
do_log(debug, debug, F, A) ->
do_log(?DEBUG_STR, F, A);
do_log(_, _, _F, _A) ->
ok.
do_log(SEV, F, A) ->
Name =
case get(?NAME) of
L when is_list(L) ->
L;
_ ->
"UNDEFINED"
end,
Msg = {?MSG, "~s ~s [~s] " ++ F ++ "~n",
[SEV, Name, formated_timestamp() | A]},
(catch global:send(?LOGGER, Msg)).
