139 lines
4.6 KiB
Erlang
139 lines
4.6 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : ejabberd_loglevel.erl
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%%% Author : Mickael Remond <mremond@process-one.net>
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%%% Purpose : Loglevel switcher.
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%%% Be careful: you should not have any ejabberd_logger module
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%%% as ejabberd_loglevel switcher is compiling and loading
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%%% dynamically a "virtual" ejabberd_logger module (Described
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%%% in a string at the end of this module).
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%%% Created : 29 Nov 2006 by Mickael Remond <mremond@process-one.net>
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%%%
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%%%
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%%% ejabberd, Copyright (C) 2002-2009 ProcessOne
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%%%
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%%% This program is free software; you can redistribute it and/or
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%%% modify it under the terms of the GNU General Public License as
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%%% published by the Free Software Foundation; either version 2 of the
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%%% License, or (at your option) any later version.
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%%%
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%%% This program is distributed in the hope that it will be useful,
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%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
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%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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%%% General Public License for more details.
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%%%
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%%% You should have received a copy of the GNU General Public License
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%%% along with this program; if not, write to the Free Software
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%%% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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%%% 02111-1307 USA
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%%%
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%%%----------------------------------------------------------------------
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-module(ejabberd_loglevel).
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-author('mickael.remond@process-one.net').
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-export([set/1]).
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-include("ejabberd.hrl").
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-define(LOGMODULE, "error_logger").
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%% Error levels:
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%% 0 -> No log
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%% 1 -> Critical
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%% 2 -> Error
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%% 3 -> Warning
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%% 4 -> Info
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%% 5 -> Debug
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set(Loglevel) when is_integer(Loglevel) ->
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Forms = compile_string(?LOGMODULE, ejabberd_logger_src(Loglevel)),
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load_logger(Forms, ?LOGMODULE, Loglevel);
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set(_) ->
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exit("Loglevel must be an integer").
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%% --------------------------------------------------------------
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%% Compile a string into a module and returns the binary
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compile_string(Mod, Str) ->
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Fname = Mod ++ ".erl",
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{ok, Fd} = open_ram_file(Fname),
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file:write(Fd, Str),
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file:position(Fd, 0),
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case epp_dodger:parse(Fd) of
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{ok, Tree} ->
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Forms = revert_tree(Tree),
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close_ram_file(Fd),
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Forms;
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Error ->
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close_ram_file(Fd),
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Error
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end.
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open_ram_file(Fname) ->
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ram_file_io_server:start(self(), Fname, [read,write]).
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close_ram_file(Fd) ->
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file:close(Fd).
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revert_tree(Tree) ->
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[erl_syntax:revert(T) || T <- Tree].
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load_logger(Forms, Mod, Loglevel) ->
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Fname = Mod ++ ".erl",
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case compile:forms(Forms, [binary, {d,'LOGLEVEL',Loglevel}]) of
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{ok, M, Bin} ->
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code:load_binary(M, Fname, Bin);
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Error ->
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?CRITICAL_MSG("Error ~p~n", [Error])
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end.
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%% --------------------------------------------------------------
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%% Code of the ejabberd logger, dynamically compiled and loaded
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%% This allows to dynamically change log level while keeping a
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%% very efficient code.
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ejabberd_logger_src(Loglevel) ->
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L = integer_to_list(Loglevel),
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"-module(ejabberd_logger).
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-author('mickael.remond@process-one.net').
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-export([debug_msg/4,
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info_msg/4,
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warning_msg/4,
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error_msg/4,
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critical_msg/4]).
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%% Helper functions
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debug_msg(Module, Line, Format, Args) when " ++ L ++ " >= 5 ->
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notify(info_msg,
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\"D(~p:~p:~p) : \"++Format++\"~n\",
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[self(), Module, Line]++Args);
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debug_msg(_,_,_,_) -> ok.
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info_msg(Module, Line, Format, Args) when " ++ L ++ " >= 4 ->
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notify(info_msg,
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\"I(~p:~p:~p) : \"++Format++\"~n\",
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[self(), Module, Line]++Args);
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info_msg(_,_,_,_) -> ok.
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warning_msg(Module, Line, Format, Args) when " ++ L ++ " >= 3 ->
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notify(error,
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\"W(~p:~p:~p) : \"++Format++\"~n\",
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[self(), Module, Line]++Args);
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warning_msg(_,_,_,_) -> ok.
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error_msg(Module, Line, Format, Args) when " ++ L ++ " >= 2 ->
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notify(error,
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\"E(~p:~p:~p) : \"++Format++\"~n\",
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[self(), Module, Line]++Args);
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error_msg(_,_,_,_) -> ok.
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critical_msg(Module, Line, Format, Args) when " ++ L ++ " >= 1 ->
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notify(error,
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\"C(~p:~p:~p) : \"++Format++\"~n\",
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[self(), Module, Line]++Args);
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critical_msg(_,_,_,_) -> ok.
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%% Distribute the message to the Erlang error logger
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notify(Type, Format, Args) ->
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LoggerMsg = {Type, group_leader(), {self(), Format, Args}},
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gen_event:notify(error_logger, LoggerMsg).
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".
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