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%% The contents of this file are subject to the Mozilla Public License
%% Version 1.1 (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.mozilla.org/MPL/
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and
%% limitations under the License.
%%
%% The Original Code is RabbitMQ.
%%
%% The Initial Developer of the Original Code is GoPivotal, Inc.
%% Copyright (c) 2007-2014 GoPivotal, Inc. All rights reserved.
%%
-module(rabbit_log).
-export([log/3, log/4, info/1, info/2, warning/1, warning/2, error/1, error/2]).
-export([with_local_io/1]).
%%----------------------------------------------------------------------------
-ifdef(use_specs).
-export_type([level/0]).
-type(category() :: atom()).
-type(level() :: 'info' | 'warning' | 'error').
-spec(log/3 :: (category(), level(), string()) -> 'ok').
-spec(log/4 :: (category(), level(), string(), [any()]) -> 'ok').
-spec(info/1 :: (string()) -> 'ok').
-spec(info/2 :: (string(), [any()]) -> 'ok').
-spec(warning/1 :: (string()) -> 'ok').
-spec(warning/2 :: (string(), [any()]) -> 'ok').
-spec(error/1 :: (string()) -> 'ok').
-spec(error/2 :: (string(), [any()]) -> 'ok').
-spec(with_local_io/1 :: (fun (() -> A)) -> A).
-endif.
%%----------------------------------------------------------------------------
log(Category, Level, Fmt) -> log(Category, Level, Fmt, []).
log(Category, Level, Fmt, Args) when is_list(Args) ->
case level(Level) =< catlevel(Category) of
false -> ok;
true -> F = case Level of
info -> fun error_logger:info_msg/2;
warning -> fun error_logger:warning_msg/2;
error -> fun error_logger:error_msg/2
end,
with_local_io(fun () -> F(Fmt, Args) end)
end.
info(Fmt) -> log(default, info, Fmt).
info(Fmt, Args) -> log(default, info, Fmt, Args).
warning(Fmt) -> log(default, warning, Fmt).
warning(Fmt, Args) -> log(default, warning, Fmt, Args).
error(Fmt) -> log(default, error, Fmt).
error(Fmt, Args) -> log(default, error, Fmt, Args).
catlevel(Category) ->
%% We can get here as part of rabbitmqctl when it is impersonating
%% a node; in which case the env will not be defined.
CatLevelList = case application:get_env(rabbit, log_levels) of
{ok, L} -> L;
undefined -> []
end,
level(proplists:get_value(Category, CatLevelList, info)).
%%--------------------------------------------------------------------
level(info) -> 3;
level(warning) -> 2;
level(error) -> 1;
level(none) -> 0.
%% Execute Fun using the IO system of the local node (i.e. the node on
%% which the code is executing). Since this is invoked for every log
%% message, we try to avoid unnecessarily churning group_leader/1.
with_local_io(Fun) ->
GL = group_leader(),
Node = node(),
case node(GL) of
Node -> Fun();
_ -> group_leader(whereis(user), self()),
try
Fun()
after
group_leader(GL, self())
end
end.
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