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Modules shared by rabbitmq-server and rabbitmq-erlang-client
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Files
src/lager_forwarder_backend.erl
%% 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) 2007-2017 Pivotal Software, Inc. All rights reserved.
%%
-module(lager_forwarder_backend).
-behaviour(gen_event).
-export([init/1, handle_call/2, handle_event/2, handle_info/2, terminate/2,
code_change/3]).
-record(state, {
next_sink :: atom(),
level :: {'mask', integer()} | inherit
}).
%% @private
init(Sink) when is_atom(Sink) ->
init([Sink]);
init([Sink]) when is_atom(Sink) ->
init([Sink, inherit]);
init([Sink, inherit]) when is_atom(Sink) ->
{ok, #state{
next_sink = Sink,
level = inherit
}};
init([Sink, Level]) when is_atom(Sink) ->
try
Mask = lager_util:config_to_mask(Level),
{ok, #state{
next_sink = Sink,
level = Mask
}}
catch
_:_ ->
{error, {fatal, bad_log_level}}
end;
init(_) ->
{error, {fatal, bad_config}}.
%% @private
handle_call(get_loglevel, #state{next_sink = Sink, level = inherit} = State) ->
SinkPid = whereis(Sink),
Mask = case self() of
SinkPid ->
%% Avoid direct loops, defaults to 'info'.
127;
_ ->
try
Levels = [gen_event:call(SinkPid, Handler, get_loglevel,
infinity)
|| Handler <- gen_event:which_handlers(SinkPid)],
lists:foldl(fun
({mask, Mask}, Acc) ->
Mask bor Acc;
(Level, Acc) when is_integer(Level) ->
{mask, Mask} = lager_util:config_to_mask(
lager_util:num_to_level(Level)),
Mask bor Acc;
(_, Acc) ->
Acc
end, 0, Levels)
catch
exit:noproc ->
127
end
end,
{ok, {mask, Mask}, State};
handle_call(get_loglevel, #state{level = Mask} = State) ->
{ok, Mask, State};
handle_call({set_loglevel, inherit}, State) ->
{ok, ok, State#state{level = inherit}};
handle_call({set_loglevel, Level}, State) ->
try lager_util:config_to_mask(Level) of
Mask ->
{ok, ok, State#state{level = Mask}}
catch
_:_ ->
{ok, {error, bad_log_level}, State}
end;
handle_call(_Request, State) ->
{ok, ok, State}.
%% @private
handle_event({log, LagerMsg}, #state{next_sink = Sink, level = Mask} = State) ->
SinkPid = whereis(Sink),
case self() of
SinkPid ->
%% Avoid direct loops.
ok;
_ ->
case Mask =:= inherit orelse
lager_util:is_loggable(LagerMsg, Mask, ?MODULE) of
true ->
case lager_config:get({Sink, async}, false) of
true -> gen_event:notify(SinkPid, {log, LagerMsg});
false -> gen_event:sync_notify(SinkPid, {log, LagerMsg})
end;
false ->
ok
end
end,
{ok, State};
handle_event(_Event, State) ->
{ok, State}.
%% @private
handle_info(_Info, State) ->
{ok, State}.
%% @private
terminate(_Reason, _State) ->
ok.
%% @private
code_change(_OldVsn, State, _Extra) ->
{ok, State}.