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Add Elixir Logger Backend to bridge logs from lager
We will need to support loglevel bridging. It should help with #966
This commit is contained in:
Mickael Remond
parent
842d52352a
commit
f4ee8a2505
@ -102,6 +102,29 @@ get_string_env(Name, Default) ->
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%% @spec () -> ok
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start() ->
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StartedApps = application:which_applications(5000),
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case lists:keyfind(logger, 1, StartedApps) of
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{logger, _, _} ->
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error_logger:info_msg("Ignoring logger options, using Elixir Logger.", []),
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%% Do not start lager, we rely on Elixir Logger
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do_start_for_logger();
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_ ->
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do_start()
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end.
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do_start_for_logger() ->
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application:load(sasl),
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application:set_env(sasl, sasl_error_logger, false),
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application:load(lager),
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application:set_env(lager, error_logger_redirect, false),
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application:set_env(lager, error_logger_whitelist, ['Elixir.Logger.ErrorHandler']),
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application:set_env(lager, crash_log, false),
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application:set_env(lager, handlers, [{elixir_logger_backend, [{level, debug}]}]),
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ejabberd:start_app(lager),
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ok.
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%% Start lager
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do_start() ->
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application:load(sasl),
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application:set_env(sasl, sasl_error_logger, false),
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application:load(lager),
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@ -145,7 +168,7 @@ rotate_log() ->
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%% @spec () -> {loglevel(), atom(), string()}
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get() ->
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case lager:get_loglevel(lager_console_backend) of
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case get_lager_loglevel() of
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none -> {0, no_log, "No log"};
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emergency -> {1, critical, "Critical"};
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alert -> {1, critical, "Critical"};
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@ -168,7 +191,7 @@ set(LogLevel) when is_integer(LogLevel) ->
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5 -> debug;
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E -> throw({wrong_loglevel, E})
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end,
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case lager:get_loglevel(lager_console_backend) of
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case get_lager_loglevel() of
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LagerLogLevel ->
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ok;
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_ ->
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@ -186,3 +209,20 @@ set(LogLevel) when is_integer(LogLevel) ->
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set({_LogLevel, _}) ->
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error_logger:error_msg("custom loglevels are not supported for 'lager'"),
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{module, lager}.
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get_lager_loglevel() ->
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R = case get_lager_handlers() of
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[] -> none;
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[elixir_logger_backend] -> debug;
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[FirstHandler|_] ->
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lager:get_loglevel(FirstHandler)
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end,
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R.
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get_lager_handlers() ->
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case catch gen_event:which_handlers(lager_event) of
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{'EXIT',noproc} ->
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[];
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Result ->
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Result
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end.
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115
src/elixir_logger_backend.erl
Normal file
115
src/elixir_logger_backend.erl
Normal file
@ -0,0 +1,115 @@
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%%%-------------------------------------------------------------------
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%%% @author Mickael Remond <mremond@process-one.net>
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%%% @doc
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%%% This module bridges lager logs to Elixir Logger.
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%%% @end
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%%% Created : 9 March 2016 by Mickael Remond <mremond@process-one.net>
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%%%
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%%% ejabberd, Copyright (C) 2002-2016 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 along
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%%% with this program; if not, write to the Free Software Foundation, Inc.,
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%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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%%%
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%%%-------------------------------------------------------------------
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-module(elixir_logger_backend).
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-behaviour(gen_event).
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-export([init/1, handle_call/2, handle_event/2, handle_info/2, terminate/2,
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code_change/3]).
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init(_Opts) ->
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State = [],
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{ok, State}.
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%% @private
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handle_event({log, LagerMsg}, State) ->
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#{mode := Mode, truncate := Truncate, level := MinLevel, utc_log := UTCLog} = 'Elixir.Logger.Config':'__data__'(),
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MsgLevel = severity_to_level(lager_msg:severity(LagerMsg)),
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case {lager_util:is_loggable(LagerMsg, debug, ?MODULE), 'Elixir.Logger':compare_levels(MsgLevel, MinLevel)} of
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{_, lt}->
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{ok, State};
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{true, _} ->
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Metadata = normalize_pid(lager_msg:metadata(LagerMsg)),
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Message = 'Elixir.Logger.Utils':truncate(lager_msg:message(LagerMsg), Truncate),
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Timestamp = timestamp(lager_msg:timestamp(LagerMsg), UTCLog),
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GroupLeader = case proplists:get_value(pid, Metadata, self()) of
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Pid when is_pid(Pid) ->
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erlang:process_info(self(), group_leader);
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_ -> {group_leader, self()}
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end,
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notify(Mode, {MsgLevel, GroupLeader, {'Elixir.Logger', Message, Timestamp, Metadata}}),
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{ok, State};
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_ ->
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{ok, State}
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end;
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handle_event(_, State) ->
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{ok, State}.
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%% @private
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%% TODO Handle loglevels
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handle_call(_Msg, State) ->
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{ok, ok, State}.
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%% @private
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handle_info(_Msg, State) ->
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{ok, State}.
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%% @private
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terminate(_Reason, _State) ->
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ok.
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%% @private
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code_change(_OldVsn, State, _Extra) ->
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{ok, State}.
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notify(sync, Msg) ->
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gen_event:sync_notify('Elixir.Logger', Msg);
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notify(async, Msg) -> gen_event:notify('Elixir.Logger', Msg).
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normalize_pid(Metadata) ->
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case proplists:get_value(pid, Metadata) of
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Pid when is_pid(Pid) -> Metadata;
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Pid when is_list(Pid) ->
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M1 = proplists:delete(pid, Metadata),
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case catch erlang:list_to_pid(Pid) of
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{'EXIT', _} ->
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M1;
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PidAsPid ->
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[{pid, PidAsPid}|M1]
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end;
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_ ->
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proplists:delete(pid, Metadata)
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end.
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%% Return timestamp with milliseconds
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timestamp(Time, UTCLog) ->
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{_, _, Micro} = erlang:timestamp(),
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{Date, {Hours, Minutes, Seconds}} =
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case UTCLog of
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true -> calendar:now_to_universal_time(Time);
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false -> calendar:now_to_local_time(Time)
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end,
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{Date, {Hours, Minutes, Seconds, Micro div 1000}}.
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severity_to_level(debug) -> debug;
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severity_to_level(info) -> info;
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severity_to_level(notice) -> info;
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severity_to_level(warning) -> warn;
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severity_to_level(error) -> error;
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severity_to_level(critical) -> error;
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severity_to_level(alert) -> error;
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severity_to_level(emergency) -> error.
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