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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).
-behaviour(gen_server).
-export([start_link/0]).
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-export([log/3, log/4, info/1, info/2, warning/1, warning/2, error/1, error/2]).
-define(SERVER, ?MODULE).
%%----------------------------------------------------------------------------
-ifdef(use_specs).
-export_type([level/0]).
-type(category() :: atom()).
-type(level() :: 'info' | 'warning' | 'error').
-spec(start_link/0 :: () -> rabbit_types:ok_pid_or_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').
-endif.
%%----------------------------------------------------------------------------
start_link() ->
gen_server:start_link({local, ?SERVER}, ?MODULE, [], []).
log(Category, Level, Fmt) -> log(Category, Level, Fmt, []).
log(Category, Level, Fmt, Args) when is_list(Args) ->
gen_server:cast(?SERVER, {log, Category, Level, Fmt, Args}).
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).
%%--------------------------------------------------------------------
init([]) ->
{ok, CatLevelList} = application:get_env(log_levels),
CatLevels = [{Cat, level(Level)} || {Cat, Level} <- CatLevelList],
{ok, orddict:from_list(CatLevels)}.
handle_call(_Request, _From, State) ->
{noreply, State}.
handle_cast({log, Category, Level, Fmt, Args}, CatLevels) ->
CatLevel = case orddict:find(Category, CatLevels) of
{ok, L} -> L;
error -> level(info)
end,
case level(Level) =< CatLevel of
false -> ok;
true -> (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)(Fmt, Args)
end,
{noreply, CatLevels};
handle_cast(_Msg, State) ->
{noreply, State}.
handle_info(_Info, State) ->
{noreply, State}.
terminate(_Reason, _State) ->
ok.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%%--------------------------------------------------------------------
level(info) -> 3;
level(warning) -> 2;
level(error) -> 1;
level(none) -> 0.
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