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269 linhas
10 KiB
269 linhas
10 KiB
%% Copyright (c) 2011 Basho Technologies, Inc. All Rights Reserved.
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%%
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%% This file is provided to you under the Apache License,
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%% Version 2.0 (the "License"); you may not use this file
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%% except in compliance with the License. You may obtain
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%% a copy of the License at
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%%
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%% http://www.apache.org/licenses/LICENSE-2.0
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%%
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%% Unless required by applicable law or agreed to in writing,
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%% software distributed under the License is distributed on an
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%% "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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%% KIND, either express or implied. See the License for the
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%% specific language governing permissions and limitations
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%% under the License.
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%% @doc A error_logger backend for redirecting events into lager.
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%% Error messages and crash logs are also optionally written to a crash log.
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%% @see lager_crash_log
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%% @private
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-module(error_logger_lager_h).
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-include("lager.hrl").
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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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-export([format_reason/1]).
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-define(LOG(Level, Pid, Msg),
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case ?SHOULD_LOG(Level) of
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true ->
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lager:log(Level, Pid, Msg);
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_ -> ok
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end).
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-define(LOG(Level, Pid, Fmt, Args),
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case ?SHOULD_LOG(Level) of
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true ->
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lager:log(Level, Pid, Fmt, Args);
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_ -> ok
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end).
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-ifdef(TEST).
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%% Make CRASH synchronous when testing, to avoid timing headaches
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-define(CRASH_LOG(Event),
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catch(gen_server:call(lager_crash_log, {log, Event}))).
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-else.
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-define(CRASH_LOG(Event),
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gen_server:cast(lager_crash_log, {log, Event})).
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-endif.
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-spec init(any()) -> {ok, {}}.
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init(_) ->
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{ok, {}}.
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handle_call(_Request, State) ->
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{ok, ok, State}.
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handle_event(Event, State) ->
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case Event of
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{error, _GL, {Pid, Fmt, Args}} ->
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case Fmt of
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"** Generic server "++_ ->
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%% gen_server terminate
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[Name, _Msg, _State, Reason] = Args,
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?CRASH_LOG(Event),
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?LOG(error, Pid, "gen_server ~w terminated with reason: ~s",
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[Name, format_reason(Reason)]);
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"** State machine "++_ ->
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%% gen_fsm terminate
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[Name, _Msg, StateName, _StateData, Reason] = Args,
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?CRASH_LOG(Event),
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?LOG(error, Pid, "gen_fsm ~w in state ~w terminated with reason: ~s",
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[Name, StateName, format_reason(Reason)]);
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"** gen_event handler"++_ ->
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%% gen_event handler terminate
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[ID, Name, _Msg, _State, Reason] = Args,
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?CRASH_LOG(Event),
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?LOG(error, Pid, "gen_event ~w installed in ~w terminated with reason: ~s",
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[ID, Name, format_reason(Reason)]);
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_ ->
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?CRASH_LOG(Event),
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?LOG(error, Pid, lager:safe_format(Fmt, Args, 4096))
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end;
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{error_report, _GL, {Pid, std_error, D}} ->
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?CRASH_LOG(Event),
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?LOG(error, Pid, print_silly_list(D));
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{error_report, _GL, {Pid, supervisor_report, D}} ->
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?CRASH_LOG(Event),
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case lists:sort(D) of
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[{errorContext, Ctx}, {offender, Off}, {reason, Reason}, {supervisor, Name}] ->
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Offender = format_offender(Off),
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?LOG(error, Pid,
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"Supervisor ~w had child ~s exit with reason ~s in context ~w",
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[element(2, Name), Offender, format_reason(Reason), Ctx]);
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_ ->
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?LOG(error, Pid, ["SUPERVISOR REPORT ", print_silly_list(D)])
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end;
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{error_report, _GL, {Pid, crash_report, [Self, Neighbours]}} ->
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?CRASH_LOG(Event),
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?LOG(error, Pid, ["CRASH REPORT ", format_crash_report(Self, Neighbours)]);
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{warning_msg, _GL, {Pid, Fmt, Args}} ->
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?LOG(warning, Pid, lager:safe_format(Fmt, Args, 4096));
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{warning_report, _GL, {Pid, std_warning, Report}} ->
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?LOG(warning, Pid, print_silly_list(Report));
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{info_msg, _GL, {Pid, Fmt, Args}} ->
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?LOG(info, Pid, lager:safe_format(Fmt, Args, 4096));
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{info_report, _GL, {Pid, std_info, D}} when is_list(D) ->
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Details = lists:sort(D),
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case Details of
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[{application, App}, {exited, Reason}, {type, _Type}] ->
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?LOG(info, Pid, "Application ~w exited with reason: ~s",
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[App, format_reason(Reason)]);
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_ ->
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?LOG(info, Pid, print_silly_list(D))
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end;
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{info_report, _GL, {Pid, std_info, D}} ->
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?LOG(info, Pid, "~w", [D]);
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{info_report, _GL, {P, progress, D}} ->
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Details = lists:sort(D),
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case Details of
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[{application, App}, {started_at, Node}] ->
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?LOG(info, P, "Application ~w started on node ~w",
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[App, Node]);
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[{started, Started}, {supervisor, Name}] ->
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MFA = format_mfa(proplists:get_value(mfargs, Started)),
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Pid = proplists:get_value(pid, Started),
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?LOG(debug, P, "Supervisor ~w started ~s at pid ~w",
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[element(2, Name), MFA, Pid]);
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_ ->
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?LOG(info, P, ["PROGRESS REPORT ", print_silly_list(D)])
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end;
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_ ->
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?LOG(warning, self(), "Unexpected error_logger event ~w", [Event])
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end,
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{ok, State}.
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handle_info(_Info, State) ->
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{ok, State}.
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terminate(_Reason, _State) ->
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ok.
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code_change(_OldVsn, State, _Extra) ->
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{ok, State}.
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%% internal functions
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format_crash_report(Report, Neighbours) ->
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Name = proplists:get_value(registered_name, Report, proplists:get_value(pid, Report)),
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{_Class, Reason, _Trace} = proplists:get_value(error_info, Report),
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io_lib:format("Process ~w with ~w neighbours crashed with reason: ~s",
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[Name, length(Neighbours), format_reason(Reason)]).
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format_offender(Off) ->
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case proplists:get_value(name, Off) of
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undefined ->
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%% supervisor_bridge
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io_lib:format("at module ~w at ~w",
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[proplists:get_value(mod, Off), proplists:get_value(pid, Off)]);
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Name ->
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%% regular supervisor
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MFA = format_mfa(proplists:get_value(mfargs, Off)),
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io_lib:format("~w started with ~s at ~w",
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[Name, MFA, proplists:get_value(pid, Off)])
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end.
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format_reason({'function not exported', [{M, F, A},MFA|_]}) ->
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["call to undefined function ", format_mfa({M, F, length(A)}),
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" from ", format_mfa(MFA)];
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format_reason({undef, [MFA|_]}) ->
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["call to undefined function ", format_mfa(MFA)];
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format_reason({bad_return_value, Val}) ->
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["bad return value: ", print_val(Val)];
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format_reason({{bad_return_value, Val}, MFA}) ->
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["bad return value: ", print_val(Val), " in ", format_mfa(MFA)];
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format_reason({{case_clause, Val}, [MFA|_]}) ->
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["no case clause matching ", print_val(Val), " in ", format_mfa(MFA)];
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format_reason({function_clause, [MFA|_]}) ->
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["no function clause matching ", format_mfa(MFA)];
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format_reason({if_clause, [MFA|_]}) ->
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["no true branch found while evaluating if expression in ", format_mfa(MFA)];
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format_reason({{try_clause, Val}, [MFA|_]}) ->
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["no try clause matching ", print_val(Val), " in ", format_mfa(MFA)];
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format_reason({badarith, [MFA|_]}) ->
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["bad arithmetic expression in ", format_mfa(MFA)];
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format_reason({{badmatch, Val}, [MFA|_]}) ->
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["no match of right hand value ", print_val(Val), " in ", format_mfa(MFA)];
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format_reason({emfile, _Trace}) ->
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"maximum number of file descriptors exhausted, check ulimit -n";
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format_reason({system_limit, [{M, F, _}|_] = Trace}) ->
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Limit = case {M, F} of
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{erlang, open_port} ->
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"maximum number of ports exceeded";
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{erlang, spawn} ->
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"maximum number of processes exceeded";
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{erlang, spawn_opt} ->
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"maximum number of processes exceeded";
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{erlang, list_to_atom} ->
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"tried to create an atom larger than 255, or maximum atom count exceeded";
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{ets, new} ->
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"maximum number of ETS tables exceeded";
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_ ->
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{Str, _} = lager_trunc_io:print(Trace, 500),
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Str
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end,
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["system limit: ", Limit];
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format_reason({badarg, [MFA,MFA2|_]}) ->
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case MFA of
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{_M, _F, A} when is_list(A) ->
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["bad argument in call to ", format_mfa(MFA), " in ", format_mfa(MFA2)];
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_ ->
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%% seems to be generated by a bad call to a BIF
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["bad argument in ", format_mfa(MFA)]
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end;
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format_reason({{badarity, {Fun, Args}}, [MFA|_]}) ->
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{arity, Arity} = lists:keyfind(arity, 1, erlang:fun_info(Fun)),
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[io_lib:format("fun called with wrong arity of ~w instead of ~w in ",
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[length(Args), Arity]), format_mfa(MFA)];
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format_reason({noproc, MFA}) ->
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["no such process or port in call to ", format_mfa(MFA)];
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format_reason({{badfun, Term}, [MFA|_]}) ->
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["bad function ", print_val(Term), " in ", format_mfa(MFA)];
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format_reason(Reason) ->
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{Str, _} = lager_trunc_io:print(Reason, 500),
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Str.
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format_mfa({M, F, A}) when is_list(A) ->
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{FmtStr, Args} = format_args(A, [], []),
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io_lib:format("~w:~w("++FmtStr++")", [M, F | Args]);
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format_mfa({M, F, A}) when is_integer(A) ->
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io_lib:format("~w:~w/~w", [M, F, A]);
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format_mfa(Other) ->
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io_lib:format("~w", [Other]).
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format_args([], FmtAcc, ArgsAcc) ->
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{string:join(lists:reverse(FmtAcc), ", "), lists:reverse(ArgsAcc)};
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format_args([H|T], FmtAcc, ArgsAcc) ->
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{Str, _} = lager_trunc_io:print(H, 100),
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format_args(T, ["~s"|FmtAcc], [Str|ArgsAcc]).
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print_silly_list(L) when is_list(L) ->
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case lager_stdlib:string_p(L) of
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true ->
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lager_trunc_io:format("~s", [L], 4096);
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_ ->
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print_silly_list(L, [], [])
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end;
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print_silly_list(L) ->
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{Str, _} = lager_trunc_io:print(L, 4096),
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Str.
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print_silly_list([], Fmt, Acc) ->
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lager_trunc_io:format(string:join(lists:reverse(Fmt), ", "),
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lists:reverse(Acc), 4096);
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print_silly_list([{K,V}|T], Fmt, Acc) ->
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print_silly_list(T, ["~w: ~w" | Fmt], [V, K | Acc]);
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print_silly_list([H|T], Fmt, Acc) ->
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print_silly_list(T, ["~w" | Fmt], [H | Acc]).
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print_val(Val) ->
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{Str, _} = lager_trunc_io:print(Val, 500),
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Str.
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