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ejabberd_loglevel.erl
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ejabberd_loglevel.erl
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%%%----------------------------------------------------------------------
%%% File : ejabberd_loglevel.erl
%%% Author : Mickael Remond <mremond@process-one.net>
%%% Purpose : Loglevel switcher.
%%% Be careful: you should not have any ejabberd_logger module
%%% as ejabberd_loglevel switcher is compiling and loading
%%% dynamically a "virtual" ejabberd_logger module (Described
%%% in a string at the end of this module).
%%% Created : 29 Nov 2006 by Mickael Remond <mremond@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2013 ProcessOne
%%%
%%% This program is free software; you can redistribute it and/or
%%% modify it under the terms of the GNU General Public License as
%%% published by the Free Software Foundation; either version 2 of the
%%% License, or (at your option) any later version.
%%%
%%% This program is distributed in the hope that it will be useful,
%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
%%% General Public License for more details.
%%%
%%% You should have received a copy of the GNU General Public License
%%% along with this program; if not, write to the Free Software
%%% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
%%% 02111-1307 USA
%%%
%%%----------------------------------------------------------------------
-module(ejabberd_loglevel).
-author('mickael.remond@process-one.net').
-export([set/1,
get/0,
set_custom/2,
clear_custom/0,
clear_custom/1]).
-include("ejabberd.hrl").
-define(LOGMODULE, "error_logger").
%% Error levels:
-record(loglevel, {ordinal,
name,
description,
function = no_log,
event_type = no_log,
msg_prefix = no_log}).
-define(LOG_LEVELS,
[#loglevel{ordinal = 0, name = no_log, description = "No log"},
#loglevel{ordinal = 1, name = critical, description = "Critical",
function = critical_msg, event_type = error, msg_prefix = "C"},
#loglevel{ordinal = 2, name = error, description = "Error",
function = error_msg, event_type = error, msg_prefix = "E"},
#loglevel{ordinal = 3, name = warning, description = "Warning",
function = warning_msg, event_type = warning_msg, msg_prefix = "W"},
#loglevel{ordinal = 4, name = info, description = "Info",
function = info_msg, event_type = info_msg, msg_prefix = "I"},
#loglevel{ordinal = 5, name = debug, description = "Debug",
function = debug_msg, event_type = info_msg, msg_prefix = "D"}]).
%% @type level() = integer() | atom().
%% @spec () -> {DefaultLevelOrdinal::integer(), [{Module::atom(), LevelOrdinal::integer()}]}
%% @doc Get the default and all custom levels
get() ->
{DefaultLevel, _CustomLevels} = ejabberd_logger:get(),
case lists:keysearch(DefaultLevel, #loglevel.ordinal, ?LOG_LEVELS) of
{value, Result = #loglevel{}} ->
{Result#loglevel.ordinal, Result#loglevel.name, Result#loglevel.description};
_ ->
erlang:error({no_such_loglevel, DefaultLevel})
end.
%% @spec (DefaultLevel::level() | {DefaultLevel::level(), [{Module::atom(), Level::level()}]}) ->
%% {module, ejabberd_logger}
%% @doc Set the default and all custom levels
set(DefaultLevel) when is_atom(DefaultLevel) orelse is_integer(DefaultLevel) ->
set({DefaultLevel, []});
set({DefaultLevel, CustomLevels}) when is_list(CustomLevels) ->
DefaultInt = level_to_integer(DefaultLevel),
CustomInts = [level_to_integer(C) || C <- CustomLevels],
Loglevel = {DefaultInt, CustomInts},
try
{Mod,Code} = dynamic_compile:from_string(ejabberd_logger_src(Loglevel)),
code:load_binary(Mod, ?LOGMODULE ++ ".erl", Code)
catch
Type:Error -> ?CRITICAL_MSG("Error compiling logger (~p): ~p~n", [Type, Error])
end;
set(_) ->
exit("Invalid loglevel format").
%% @spec (Module::atom(), CustomLevel::level()) -> ok
%% @doc Set a custom level
set_custom(Module, Level) ->
{DefaultLevel, CustomLevels} = ejabberd_logger:get(),
case lists:keysearch(Module, 1, CustomLevels) of
{value, {Module, Level}} ->
ok;
{value, _} ->
set({DefaultLevel, lists:keyreplace(Module, 1, CustomLevels, {Module, Level})});
_ ->
set({DefaultLevel, [{Module, Level} | CustomLevels]})
end.
%% @spec () -> ok
%% @doc Clear all custom levels
clear_custom() ->
{DefaultLevel, _CustomLevels} = ejabberd_logger:get(),
set({DefaultLevel, []}).
%% @spec (Module::atom()) -> ok
%% @doc Clear a custom level
clear_custom(Module) ->
{DefaultLevel, CustomLevels} = ejabberd_logger:get(),
case lists:keysearch(Module, 1, CustomLevels) of
{value, _} ->
set({DefaultLevel, lists:keydelete(Module, 1, CustomLevels)});
_ ->
ok
end.
level_to_integer(Level) when is_integer(Level) ->
Level;
level_to_integer({Module, Level}) ->
{Module, level_to_integer(Level)};
level_to_integer(Level) ->
case lists:keysearch(Level, #loglevel.name, ?LOG_LEVELS) of
{value, #loglevel{ordinal = Int}} -> Int;
_ -> erlang:error({no_such_loglevel, Level})
end.
%% --------------------------------------------------------------
%% Code of the ejabberd logger, dynamically compiled and loaded
%% This allows to dynamically change log level while keeping a
%% very efficient code.
ejabberd_logger_src(Loglevel) ->
lists:flatten([header_src(),
get_src(Loglevel),
[log_src(Loglevel, LevelSpec) || LevelSpec <- ?LOG_LEVELS],
notify_src()]).
header_src() ->
"-module(ejabberd_logger).
-author('mickael.remond@process-one.net').
-export([debug_msg/4,
info_msg/4,
warning_msg/4,
error_msg/4,
critical_msg/4,
get/0]).
".
get_src(Loglevel) ->
io_lib:format("get() -> ~w.
", [Loglevel]).
log_src(_Loglevel, #loglevel{function = no_log}) ->
[];
log_src({DefaultLevel, [{Module, Level} | Tail]}, Spec = #loglevel{ordinal = MinLevel})
when Level < MinLevel andalso MinLevel =< DefaultLevel ->
[atom_to_list(Spec#loglevel.function), "(", atom_to_list(Module), ", _, _, _) -> ok;
", log_src({DefaultLevel, Tail}, Spec)];
log_src({DefaultLevel, [{Module, Level} | Tail]}, Spec = #loglevel{ordinal = MinLevel})
when DefaultLevel < MinLevel andalso MinLevel =< Level ->
[atom_to_list(Spec#loglevel.function), "(", atom_to_list(Module), " = Module, Line, Format, Args) ->",
log_notify_src(Spec), ";
", log_src({DefaultLevel, Tail}, Spec)];
log_src({DefaultLevel, [_Head | Tail]}, Spec = #loglevel{}) ->
log_src({DefaultLevel, Tail}, Spec);
log_src({DefaultLevel, []}, Spec = #loglevel{ordinal = MinLevel})
when DefaultLevel < MinLevel ->
[atom_to_list(Spec#loglevel.function), "(_, _, _, _) -> ok.
"];
log_src({_DefaultLevel, []}, Spec = #loglevel{}) ->
[atom_to_list(Spec#loglevel.function), "(Module, Line, Format, Args) ->",
log_notify_src(Spec), ".
"].
log_notify_src(Spec = #loglevel{}) ->
["notify(", atom_to_list(Spec#loglevel.event_type), ",
\"", Spec#loglevel.msg_prefix, "(~p:~p:~p) : \"++Format++\"~n\",
[self(), Module, Line | Args])"].
notify_src() ->
%% Distribute the message to the Erlang error logger
"notify(Type, Format, Args) ->
LoggerMsg = {Type, group_leader(), {self(), Format, Args}},
gen_event:notify(error_logger, LoggerMsg).
".