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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_error_logger).
-include("rabbit.hrl").
-include("rabbit_framing.hrl").
-define(LOG_EXCH_NAME, <<"amq.rabbitmq.log">>).
-behaviour(gen_event).
-export([start/0, stop/0]).
-export([init/1, terminate/2, code_change/3, handle_call/2, handle_event/2,
handle_info/2]).
%%----------------------------------------------------------------------------
-ifdef(use_specs).
-spec(start/0 :: () -> 'ok').
-spec(stop/0 :: () -> 'ok').
-endif.
%%----------------------------------------------------------------------------
start() ->
{ok, DefaultVHost} = application:get_env(default_vhost),
ok = error_logger:add_report_handler(?MODULE, [DefaultVHost]).
stop() ->
terminated_ok = error_logger:delete_report_handler(rabbit_error_logger),
ok.
%%----------------------------------------------------------------------------
init([DefaultVHost]) ->
#exchange{} = rabbit_exchange:declare(
rabbit_misc:r(DefaultVHost, exchange, ?LOG_EXCH_NAME),
topic, true, false, true, []),
{ok, #resource{virtual_host = DefaultVHost,
kind = exchange,
name = ?LOG_EXCH_NAME}}.
terminate(_Arg, _State) ->
terminated_ok.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
handle_call(_Request, State) ->
{ok, not_understood, State}.
handle_event({Kind, _Gleader, {_Pid, Format, Data}}, State) ->
ok = publish(Kind, Format, Data, State),
{ok, State};
handle_event(_Event, State) ->
{ok, State}.
handle_info(_Info, State) ->
{ok, State}.
publish(error, Format, Data, State) ->
publish1(<<"error">>, Format, Data, State);
publish(warning_msg, Format, Data, State) ->
publish1(<<"warning">>, Format, Data, State);
publish(info_msg, Format, Data, State) ->
publish1(<<"info">>, Format, Data, State);
publish(_Other, _Format, _Data, _State) ->
ok.
publish1(RoutingKey, Format, Data, LogExch) ->
%% 0-9-1 says the timestamp is a "64 bit POSIX timestamp". That's
%% second resolution, not millisecond.
Timestamp = rabbit_misc:now_ms() div 1000,
Args = [truncate:term(A, ?LOG_TRUNC) || A <- Data],
{ok, _DeliveredQPids} =
rabbit_basic:publish(LogExch, RoutingKey,
#'P_basic'{content_type = <<"text/plain">>,
timestamp = Timestamp},
list_to_binary(io_lib:format(Format, Args))),
ok.
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