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rewrite from lager
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eLog/src/error_logger_lager_h.erl

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%% Copyright (c) 2011-2015 Basho Technologies, Inc. All Rights Reserved.
%%
%% This file is provided to you under the Apache License,
%% Version 2.0 (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.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing,
%% software distributed under the License is distributed on an
%% "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
%% KIND, either express or implied. See the License for the
%% specific language governing permissions and limitations
%% under the License.
%% @doc A error_logger backend for redirecting events into lager.
%% Error messages and crash logs are also optionally written to a crash log.
%% @see lager_crash_log
%% @private
-module(error_logger_lager_h).
-include("lager.hrl").
-behaviour(gen_event).
-export([set_high_water/1]).
-export([init/1, handle_call/2, handle_event/2, handle_info/2, terminate/2,
code_change/3]).
-export([format_reason/1, format_mfa/1, format_args/3]).
-record(state, {
sink :: atom(),
shaper :: lager_shaper(),
%% group leader strategy
groupleader_strategy :: handle | ignore | mirror,
raw :: boolean()
}).
-define(LOGMSG(Sink, Level, Pid, Msg),
case ?SHOULD_LOG(Sink, Level) of
true ->
_ =lager:log(Sink, Level, Pid, Msg, []),
logged;
_ -> no_log
end).
-define(LOGFMT(Sink, Level, Pid, Fmt, Args),
case ?SHOULD_LOG(Sink, Level) of
true ->
_ = lager:log(Sink, Level, Pid, Fmt, Args),
logged;
_ -> no_log
end).
-ifdef(TEST).
%% Make CRASH synchronous when testing, to avoid timing headaches
-define(CRASH_LOG(Event),
catch(gen_server:call(lager_crash_log, {log, Event}))).
-else.
-define(CRASH_LOG(Event),
gen_server:cast(lager_crash_log, {log, Event})).
-endif.
set_high_water(N) ->
gen_event:call(error_logger, ?MODULE, {set_high_water, N}, infinity).
-spec init(any()) -> {ok, #state{}}.
init([HighWaterMark, GlStrategy]) ->
Flush = application:get_env(lager, error_logger_flush_queue, true),
FlushThr = application:get_env(lager, error_logger_flush_threshold, 0),
Shaper = #lager_shaper{hwm=HighWaterMark, flush_queue = Flush, flush_threshold = FlushThr, filter=shaper_fun(), id=?MODULE},
Raw = application:get_env(lager, error_logger_format_raw, false),
Sink = configured_sink(),
{ok, #state{sink=Sink, shaper=Shaper, groupleader_strategy=GlStrategy, raw=Raw}}.
handle_call({set_high_water, N}, #state{shaper=Shaper} = State) ->
NewShaper = Shaper#lager_shaper{hwm=N},
{ok, ok, State#state{shaper = NewShaper}};
handle_call(_Request, State) ->
{ok, unknown_call, State}.
shaper_fun() ->
case {application:get_env(lager, suppress_supervisor_start_stop, false), application:get_env(lager, suppress_application_start_stop, false)} of
{false, false} ->
fun(_) -> false end;
{true, true} ->
fun suppress_supervisor_start_and_application_start/1;
{false, true} ->
fun suppress_application_start/1;
{true, false} ->
fun suppress_supervisor_start/1
end.
suppress_supervisor_start_and_application_start(E) ->
suppress_supervisor_start(E) orelse suppress_application_start(E).
suppress_application_start({info_report, _GL, {_Pid, std_info, D}}) when is_list(D) ->
lists:member({exited, stopped}, D);
suppress_application_start({info_report, _GL, {_P, progress, D}}) ->
lists:keymember(application, 1, D) andalso lists:keymember(started_at, 1, D);
suppress_application_start(_) ->
false.
suppress_supervisor_start({info_report, _GL, {_P, progress, D}}) ->
lists:keymember(started, 1, D) andalso lists:keymember(supervisor, 1, D);
suppress_supervisor_start(_) ->
false.
handle_event(Event, #state{sink=Sink, shaper=Shaper} = State) ->
case lager_util:check_hwm(Shaper, Event) of
{true, 0, NewShaper} ->
eval_gl(Event, State#state{shaper=NewShaper});
{true, Drop, #lager_shaper{hwm=Hwm} = NewShaper} when Drop > 0 ->
?LOGFMT(Sink, warning, self(),
"lager_error_logger_h dropped ~p messages in the last second that exceeded the limit of ~p messages/sec",
[Drop, Hwm]),
eval_gl(Event, State#state{shaper=NewShaper});
{false, _, #lager_shaper{dropped=D} = NewShaper} ->
{ok, State#state{shaper=NewShaper#lager_shaper{dropped=D+1}}}
end.
handle_info({shaper_expired, ?MODULE}, #state{sink=Sink, shaper=Shaper} = State) ->
case Shaper#lager_shaper.dropped of
0 ->
ok;
Dropped ->
?LOGFMT(Sink, warning, self(),
"lager_error_logger_h dropped ~p messages in the last second that exceeded the limit of ~p messages/sec",
[Dropped, Shaper#lager_shaper.hwm])
end,
{ok, State#state{shaper=Shaper#lager_shaper{dropped=0, mps=0, lasttime=os:timestamp()}}};
handle_info(_Info, State) ->
{ok, State}.
terminate(_Reason, _State) ->
ok.
code_change(_OldVsn, {state, Shaper, GLStrategy}, _Extra) ->
Raw = application:get_env(lager, error_logger_format_raw, false),
{ok, #state{
sink=configured_sink(),
shaper=Shaper,
groupleader_strategy=GLStrategy,
raw=Raw
}};
code_change(_OldVsn, {state, Sink, Shaper, GLS}, _Extra) ->
Raw = application:get_env(lager, error_logger_format_raw, false),
{ok, #state{sink=Sink, shaper=Shaper, groupleader_strategy=GLS, raw=Raw}};
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%% internal functions
configured_sink() ->
case proplists:get_value(?ERROR_LOGGER_SINK, application:get_env(lager, extra_sinks, [])) of
undefined -> ?DEFAULT_SINK;
_ -> ?ERROR_LOGGER_SINK
end.
eval_gl(Event, #state{groupleader_strategy=GlStrategy0}=State) when is_pid(element(2, Event)) ->
case element(2, Event) of
GL when node(GL) =/= node(), GlStrategy0 =:= ignore ->
gen_event:notify({error_logger, node(GL)}, Event),
{ok, State};
GL when node(GL) =/= node(), GlStrategy0 =:= mirror ->
gen_event:notify({error_logger, node(GL)}, Event),
log_event(Event, State);
_ ->
log_event(Event, State)
end;
eval_gl(Event, State) ->
log_event(Event, State).
log_event(Event, #state{sink=Sink} = State) ->
DidLog = case Event of
{error, _GL, {Pid, Fmt, Args}} ->
FormatRaw = State#state.raw,
case {FormatRaw, Fmt} of
{false, "** Generic server "++_} ->
%% gen_server terminate
{Reason, Name} = case Args of
[N, _Msg, _State, R] ->
{R, N};
[N, _Msg, _State, R, _Client] ->
%% OTP 20 crash reports where the client pid is dead don't include the stacktrace
{R, N};
[N, _Msg, _State, R, _Client, _Stacktrace] ->
%% OTP 20 crash reports contain the pid of the client and stacktrace
%% TODO do something with them
{R, N}
end,
?CRASH_LOG(Event),
{Md, Formatted} = format_reason_md(Reason),
?LOGFMT(Sink, error, [{pid, Pid}, {name, Name} | Md], "gen_server ~w terminated with reason: ~s",
[Name, Formatted]);
{false, "** State machine "++_} ->
%% Check if the terminated process is gen_fsm or gen_statem
%% since they generate the same exit message
{Type, Name, StateName, Reason} = case Args of
[TName, _Msg, TStateName, _StateData, TReason] ->
{gen_fsm, TName, TStateName, TReason};
%% Handle changed logging in gen_fsm stdlib-3.9 (TPid, ClientArgs)
[TName, _Msg, TPid, TStateName, _StateData, TReason | _ClientArgs] when is_pid(TPid), is_atom(TStateName) ->
{gen_fsm, TName, TStateName, TReason};
%% Handle changed logging in gen_statem stdlib-3.9 (ClientArgs)
[TName, _Msg, {TStateName, _StateData}, _ExitType, TReason, _CallbackMode, Stacktrace | _ClientArgs] ->
{gen_statem, TName, TStateName, {TReason, Stacktrace}};
%% Handle changed logging in gen_statem stdlib-3.9 (ClientArgs)
[TName, {TStateName, _StateData}, _ExitType, TReason, _CallbackMode, Stacktrace | _ClientArgs] ->
{gen_statem, TName, TStateName, {TReason, Stacktrace}};
[TName, _Msg, [{TStateName, _StateData}], _ExitType, TReason, _CallbackMode, Stacktrace | _ClientArgs] ->
%% sometimes gen_statem wraps its statename/data in a list for some reason???
{gen_statem, TName, TStateName, {TReason, Stacktrace}}
end,
{Md, Formatted} = format_reason_md(Reason),
?CRASH_LOG(Event),
?LOGFMT(Sink, error, [{pid, Pid}, {name, Name} | Md], "~s ~w in state ~w terminated with reason: ~s",
[Type, Name, StateName, Formatted]);
{false, "** gen_event handler"++_} ->
%% gen_event handler terminate
[ID, Name, _Msg, _State, Reason] = Args,
{Md, Formatted} = format_reason_md(Reason),
?CRASH_LOG(Event),
?LOGFMT(Sink, error, [{pid, Pid}, {name, Name} | Md], "gen_event ~w installed in ~w terminated with reason: ~s",
[ID, Name, Formatted]);
{false, "** Cowboy handler"++_} ->
%% Cowboy HTTP server error
?CRASH_LOG(Event),
case Args of
[Module, Function, Arity, _Request, _State] ->
%% we only get the 5-element list when its a non-exported function
?LOGFMT(Sink, error, Pid,
"Cowboy handler ~p terminated with reason: call to undefined function ~p:~p/~p",
[Module, Module, Function, Arity]);
[Module, Function, Arity, _Class, Reason | Tail] ->
%% any other cowboy error_format list *always* ends with the stacktrace
StackTrace = lists:last(Tail),
{Md, Formatted} = format_reason_md({Reason, StackTrace}),
?LOGFMT(Sink, error, [{pid, Pid} | Md],
"Cowboy handler ~p terminated in ~p:~p/~p with reason: ~s",
[Module, Module, Function, Arity, Formatted])
end;
{false, "Ranch listener "++_} ->
%% Ranch errors
?CRASH_LOG(Event),
case Args of
%% Error logged by cowboy, which starts as ranch error
[Ref, ConnectionPid, StreamID, RequestPid, Reason, StackTrace] ->
{Md, Formatted} = format_reason_md({Reason, StackTrace}),
?LOGFMT(Sink, error, [{pid, RequestPid} | Md],
"Cowboy stream ~p with ranch listener ~p and connection process ~p "
"had its request process exit with reason: ~s",
[StreamID, Ref, ConnectionPid, Formatted]);
[Ref, _Protocol, Worker, {[{reason, Reason}, {mfa, {Module, Function, Arity}}, {stacktrace, StackTrace} | _], _}] ->
{Md, Formatted} = format_reason_md({Reason, StackTrace}),
?LOGFMT(Sink, error, [{pid, Worker} | Md],
"Ranch listener ~p terminated in ~p:~p/~p with reason: ~s",
[Ref, Module, Function, Arity, Formatted]);
[Ref, _Protocol, Worker, Reason] ->
{Md, Formatted} = format_reason_md(Reason),
?LOGFMT(Sink, error, [{pid, Worker} | Md],
"Ranch listener ~p terminated with reason: ~s",
[Ref, Formatted]);
[Ref, Protocol, Ret] ->
%% ranch_conns_sup.erl module line 119-123 has three parameters error msg, log it.
{Md, Formatted} = format_reason_md(Ret),
?LOGFMT(Sink, error, [{pid, Protocol} | Md],
"Ranch listener ~p terminated with result:~s",
[Ref, Formatted])
end;
{false, "webmachine error"++_} ->
%% Webmachine HTTP server error
?CRASH_LOG(Event),
[Path, Error] = Args,
%% webmachine likes to mangle the stack, for some reason
StackTrace = case Error of
{error, {error, Reason, Stack}} ->
{Reason, Stack};
_ ->
Error
end,
{Md, Formatted} = format_reason_md(StackTrace),
?LOGFMT(Sink, error, [{pid, Pid} | Md], "Webmachine error at path ~p : ~s", [Path, Formatted]);
_ ->
?CRASH_LOG(Event),
?LOGFMT(Sink, error, Pid, Fmt, Args)
end;
{error_report, _GL, {Pid, std_error, D}} ->
?CRASH_LOG(Event),
?LOGMSG(Sink, error, Pid, print_silly_list(D));
{error_report, _GL, {Pid, supervisor_report, D}} ->
?CRASH_LOG(Event),
case lists:sort(D) of
[{errorContext, Ctx}, {offender, Off}, {reason, Reason}, {supervisor, Name}] ->
Offender = format_offender(Off),
{Md, Formatted} = format_reason_md(Reason),
?LOGFMT(Sink, error, [{pid, Pid} | Md],
"Supervisor ~w had child ~s exit with reason ~s in context ~w",
[supervisor_name(Name), Offender, Formatted, Ctx]);
_ ->
?LOGMSG(Sink, error, Pid, "SUPERVISOR REPORT " ++ print_silly_list(D))
end;
{error_report, _GL, {Pid, crash_report, [Self, Neighbours]}} ->
?CRASH_LOG(Event),
{Md, Formatted} = format_crash_report(Self, Neighbours),
?LOGMSG(Sink, error, [{pid, Pid} | Md], "CRASH REPORT " ++ Formatted);
{warning_msg, _GL, {Pid, Fmt, Args}} ->
?LOGFMT(Sink, warning, Pid, Fmt, Args);
{warning_report, _GL, {Pid, std_warning, Report}} ->
?LOGMSG(Sink, warning, Pid, print_silly_list(Report));
{info_msg, _GL, {Pid, Fmt, Args}} ->
?LOGFMT(Sink, info, Pid, Fmt, Args);
{info_report, _GL, {Pid, std_info, D}} when is_list(D) ->
Details = lists:sort(D),
case Details of
[{application, App}, {exited, Reason}, {type, _Type}] ->
case application:get_env(lager, suppress_application_start_stop, false) of
true when Reason == stopped ->
no_log;
_ ->
{Md, Formatted} = format_reason_md(Reason),
?LOGFMT(Sink, info, [{pid, Pid} | Md], "Application ~w exited with reason: ~s",
[App, Formatted])
end;
_ ->
?LOGMSG(Sink, info, Pid, print_silly_list(D))
end;
{info_report, _GL, {Pid, std_info, D}} ->
?LOGFMT(Sink, info, Pid, "~w", [D]);
{info_report, _GL, {P, progress, D}} ->
Details = lists:sort(D),
case Details of
[{application, App}, {started_at, Node}] ->
case application:get_env(lager, suppress_application_start_stop, false) of
true ->
no_log;
_ ->
?LOGFMT(Sink, info, P, "Application ~w started on node ~w",
[App, Node])
end;
[{started, Started}, {supervisor, Name}] ->
case application:get_env(lager, suppress_supervisor_start_stop, false) of
true ->
no_log;
_ ->
MFA = format_mfa(get_value(mfargs, Started)),
Pid = get_value(pid, Started),
?LOGFMT(Sink, debug, P, "Supervisor ~w started ~s at pid ~w",
[supervisor_name(Name), MFA, Pid])
end;
_ ->
?LOGMSG(Sink, info, P, "PROGRESS REPORT " ++ print_silly_list(D))
end;
_ ->
?LOGFMT(Sink, warning, self(), "Unexpected error_logger event ~w", [Event])
end,
case DidLog of
logged ->
{ok, State};
no_log ->
Shaper = State#state.shaper,
{ok, State#state{
shaper = Shaper#lager_shaper{
mps = Shaper#lager_shaper.mps - 1
}
}
}
end.
format_crash_report(Report, Neighbours) ->
Name = case get_value(registered_name, Report, []) of
[] ->
%% process_info(Pid, registered_name) returns [] for unregistered processes
get_value(pid, Report);
Atom -> Atom
end,
Md0 = case get_value(dictionary, Report, []) of
[] ->
%% process_info(Pid, registered_name) returns [] for unregistered processes
[];
Dict ->
%% pull the lager metadata out of the process dictionary, if we can
get_value('_lager_metadata', Dict, [])
end,
{Class, Reason, Trace} = get_value(error_info, Report),
{Md, ReasonStr} = format_reason_md({Reason, Trace}),
Type = case Class of
exit -> "exited";
_ -> "crashed"
end,
{Md0 ++ Md, io_lib:format("Process ~w with ~w neighbours ~s with reason: ~s",
[Name, length(Neighbours), Type, ReasonStr])}.
format_offender(Off) ->
case get_value(mfargs, Off) of
undefined ->
%% supervisor_bridge
io_lib:format("at module ~w at ~w",
[get_value(mod, Off), get_value(pid, Off)]);
MFArgs ->
%% regular supervisor
{_, MFA} = format_mfa_md(MFArgs),
%% In 2014 the error report changed from `name' to
%% `id', so try that first.
Name = case get_value(id, Off) of
undefined ->
get_value(name, Off);
Id ->
Id
end,
io_lib:format("~p started with ~s at ~w",
[Name, MFA, get_value(pid, Off)])
end.
%% backwards compatability shim
format_reason(Reason) ->
element(2, format_reason_md(Reason)).
-spec format_reason_md(Stacktrace:: any()) -> {Metadata:: [{atom(), any()}], String :: list()}.
format_reason_md({'function not exported', [{M, F, A},MFA|_]}) ->
{Md, Formatted} = format_mfa_md(MFA),
{_, Formatted2} = format_mfa_md({M, F, length(A)}),
{[{reason, 'function not exported'} | Md],
["call to undefined function ", Formatted2,
" from ", Formatted]};
format_reason_md({'function not exported', [{M, F, A, _Props},MFA|_]}) ->
%% R15 line numbers
{Md, Formatted} = format_mfa_md(MFA),
{_, Formatted2} = format_mfa_md({M, F, length(A)}),
{[{reason, 'function not exported'} | Md],
["call to undefined function ", Formatted2,
" from ", Formatted]};
format_reason_md({undef, [MFA|_]}) ->
{Md, Formatted} = format_mfa_md(MFA),
{[{reason, undef} | Md],
["call to undefined function ", Formatted]};
format_reason_md({bad_return, {_MFA, {'EXIT', Reason}}}) ->
format_reason_md(Reason);
format_reason_md({bad_return, {MFA, Val}}) ->
{Md, Formatted} = format_mfa_md(MFA),
{[{reason, bad_return} | Md],
["bad return value ", print_val(Val), " from ", Formatted]};
format_reason_md({bad_return_value, Val}) ->
{[{reason, bad_return}],
["bad return value: ", print_val(Val)]};
format_reason_md({{bad_return_value, Val}, MFA}) ->
{Md, Formatted} = format_mfa_md(MFA),
{[{reason, bad_return_value} | Md],
["bad return value: ", print_val(Val), " in ", Formatted]};
format_reason_md({{badrecord, Record}, [MFA|_]}) ->
{Md, Formatted} = format_mfa_md(MFA),
{[{reason, badrecord} | Md],
["bad record ", print_val(Record), " in ", Formatted]};
format_reason_md({{case_clause, Val}, [MFA|_]}) ->
{Md, Formatted} = format_mfa_md(MFA),
{[{reason, case_clause} | Md],
["no case clause matching ", print_val(Val), " in ", Formatted]};
format_reason_md({function_clause, [MFA|_]}) ->
{Md, Formatted} = format_mfa_md(MFA),
{[{reason, function_clause} | Md],
["no function clause matching ", Formatted]};
format_reason_md({if_clause, [MFA|_]}) ->
{Md, Formatted} = format_mfa_md(MFA),
{[{reason, if_clause} | Md],
["no true branch found while evaluating if expression in ", Formatted]};
format_reason_md({{try_clause, Val}, [MFA|_]}) ->
{Md, Formatted} = format_mfa_md(MFA),
{[{reason, try_clause} | Md],
["no try clause matching ", print_val(Val), " in ", Formatted]};
format_reason_md({badarith, [MFA|_]}) ->
{Md, Formatted} = format_mfa_md(MFA),
{[{reason, badarith} | Md],
["bad arithmetic expression in ", Formatted]};
format_reason_md({{badmatch, Val}, [MFA|_]}) ->
{Md, Formatted} = format_mfa_md(MFA),
{[{reason, badmatch} | Md],
["no match of right hand value ", print_val(Val), " in ", Formatted]};
format_reason_md({emfile, _Trace}) ->
{[{reason, emfile}],
"maximum number of file descriptors exhausted, check ulimit -n"};
format_reason_md({system_limit, [{M, F, _}|_] = Trace}) ->
Limit = case {M, F} of
{erlang, open_port} ->
"maximum number of ports exceeded";
{erlang, spawn} ->
"maximum number of processes exceeded";
{erlang, spawn_opt} ->
"maximum number of processes exceeded";
{erlang, list_to_atom} ->
"tried to create an atom larger than 255, or maximum atom count exceeded";
{ets, new} ->
"maximum number of ETS tables exceeded";
_ ->
{Str, _} = lager_trunc_io:print(Trace, 500),
Str
end,
{[{reason, system_limit}], ["system limit: ", Limit]};
format_reason_md({badarg, [MFA,MFA2|_]}) ->
case MFA of
{_M, _F, A, _Props} when is_list(A) ->
%% R15 line numbers
{Md, Formatted} = format_mfa_md(MFA2),
{_, Formatted2} = format_mfa_md(MFA),
{[{reason, badarg} | Md],
["bad argument in call to ", Formatted2, " in ", Formatted]};
{_M, _F, A} when is_list(A) ->
{Md, Formatted} = format_mfa_md(MFA2),
{_, Formatted2} = format_mfa_md(MFA),
{[{reason, badarg} | Md],
["bad argument in call to ", Formatted2, " in ", Formatted]};
_ ->
%% seems to be generated by a bad call to a BIF
{Md, Formatted} = format_mfa_md(MFA),
{[{reason, badarg} | Md],
["bad argument in ", Formatted]}
end;
format_reason_md({{badarg, Stack}, _}) ->
format_reason_md({badarg, Stack});
format_reason_md({{badarity, {Fun, Args}}, [MFA|_]}) ->
{arity, Arity} = lists:keyfind(arity, 1, erlang:fun_info(Fun)),
{Md, Formatted} = format_mfa_md(MFA),
{[{reason, badarity} | Md],
[io_lib:format("fun called with wrong arity of ~w instead of ~w in ",
[length(Args), Arity]), Formatted]};
format_reason_md({noproc, MFA}) ->
{Md, Formatted} = format_mfa_md(MFA),
{[{reason, noproc} | Md],
["no such process or port in call to ", Formatted]};
format_reason_md({{badfun, Term}, [MFA|_]}) ->
{Md, Formatted} = format_mfa_md(MFA),
{[{reason, badfun} | Md],
["bad function ", print_val(Term), " in ", Formatted]};
format_reason_md({Reason, [{M, F, A}|_]}) when is_atom(M), is_atom(F), is_integer(A) ->
{Md, Formatted} = format_reason_md(Reason),
{_, Formatted2} = format_mfa_md({M, F, A}),
{Md, [Formatted, " in ", Formatted2]};
format_reason_md({Reason, [{M, F, A, Props}|_]}) when is_atom(M), is_atom(F), is_integer(A), is_list(Props) ->
%% line numbers
{Md, Formatted} = format_reason_md(Reason),
{_, Formatted2} = format_mfa_md({M, F, A, Props}),
{Md, [Formatted, " in ", Formatted2]};
format_reason_md(Reason) ->
{Str, _} = lager_trunc_io:print(Reason, 500),
{[], Str}.
%% backwards compatability shim
format_mfa(MFA) ->
element(2, format_mfa_md(MFA)).
-spec format_mfa_md(any()) -> {[{atom(), any()}], list()}.
format_mfa_md({M, F, A}) when is_list(A) ->
{FmtStr, Args} = format_args(A, [], []),
{[{module, M}, {function, F}], io_lib:format("~w:~w("++FmtStr++")", [M, F | Args])};
format_mfa_md({M, F, A}) when is_integer(A) ->
{[{module, M}, {function, F}], io_lib:format("~w:~w/~w", [M, F, A])};
format_mfa_md({M, F, A, Props}) when is_list(Props) ->
case get_value(line, Props) of
undefined ->
format_mfa_md({M, F, A});
Line ->
{Md, Formatted} = format_mfa_md({M, F, A}),
{[{line, Line} | Md], [Formatted, io_lib:format(" line ~w", [Line])]}
end;
format_mfa_md([{M, F, A}| _]) ->
%% this kind of weird stacktrace can be generated by a uncaught throw in a gen_server
format_mfa_md({M, F, A});
format_mfa_md([{M, F, A, Props}| _]) when is_list(Props) ->
%% this kind of weird stacktrace can be generated by a uncaught throw in a gen_server
%% TODO we might not always want to print the first MFA we see here, often it is more helpful
%% to print a lower one, but it is hard to programatically decide.
format_mfa_md({M, F, A, Props});
format_mfa_md(Other) ->
{[], io_lib:format("~w", [Other])}.
format_args([], FmtAcc, ArgsAcc) ->
{string:join(lists:reverse(FmtAcc), ", "), lists:reverse(ArgsAcc)};
format_args([H|T], FmtAcc, ArgsAcc) ->
{Str, _} = lager_trunc_io:print(H, 100),
format_args(T, ["~s"|FmtAcc], [Str|ArgsAcc]).
print_silly_list(L) when is_list(L) ->
case lager_stdlib:string_p(L) of
true ->
lager_trunc_io:format("~s", [L], ?DEFAULT_TRUNCATION);
_ ->
print_silly_list(L, [], [])
end;
print_silly_list(L) ->
{Str, _} = lager_trunc_io:print(L, ?DEFAULT_TRUNCATION),
Str.
print_silly_list([], Fmt, Acc) ->
lager_trunc_io:format(string:join(lists:reverse(Fmt), ", "),
lists:reverse(Acc), ?DEFAULT_TRUNCATION);
print_silly_list([{K,V}|T], Fmt, Acc) ->
print_silly_list(T, ["~p: ~p" | Fmt], [V, K | Acc]);
print_silly_list([H|T], Fmt, Acc) ->
print_silly_list(T, ["~p" | Fmt], [H | Acc]).
print_val(Val) ->
{Str, _} = lager_trunc_io:print(Val, 500),
Str.
%% @doc Faster than proplists, but with the same API as long as you don't need to
%% handle bare atom keys
get_value(Key, Value) ->
get_value(Key, Value, undefined).
get_value(Key, List, Default) ->
case lists:keyfind(Key, 1, List) of
false -> Default;
{Key, Value} -> Value
end.
supervisor_name({local, Name}) -> Name;
supervisor_name(Name) -> Name.
-ifdef(TEST).
-include_lib("eunit/include/eunit.hrl").
no_silent_hwm_drops_test_() ->
{timeout, 10000,
[
fun() ->
error_logger:tty(false),
application:load(lager),
application:set_env(lager, handlers, [{lager_test_backend, warning}]),
application:set_env(lager, error_logger_redirect, true),
application:set_env(lager, error_logger_hwm, 5),
application:set_env(lager, error_logger_flush_queue, false),
application:set_env(lager, suppress_supervisor_start_stop, true),
application:set_env(lager, suppress_application_start_stop, true),
application:unset_env(lager, crash_log),
lager:start(),
try
{_, _, MS} = os:timestamp(),
timer:sleep((1000000 - MS) div 1000 + 1),
% start close to the beginning of a new second
[error_logger:error_msg("Foo ~p~n", [K]) || K <- lists:seq(1, 15)],
wait_for_message("lager_error_logger_h dropped 10 messages in the last second that exceeded the limit of 5 messages/sec", 100, 50),
% and once again
[error_logger:error_msg("Foo1 ~p~n", [K]) || K <- lists:seq(1, 20)],
wait_for_message("lager_error_logger_h dropped 15 messages in the last second that exceeded the limit of 5 messages/sec", 100, 50)
after
application:stop(lager),
application:stop(goldrush),
error_logger:tty(true)
end
end
]
}.
shaper_does_not_forward_sup_progress_messages_to_info_level_backend_test_() ->
{timeout, 10000,
[fun() ->
error_logger:tty(false),
application:load(lager),
application:set_env(lager, handlers, [{lager_test_backend, info}]),
application:set_env(lager, error_logger_redirect, true),
application:set_env(lager, error_logger_hwm, 5),
application:set_env(lager, suppress_supervisor_start_stop, false),
application:set_env(lager, suppress_application_start_stop, false),
application:unset_env(lager, crash_log),
lager:start(),
try
PidPlaceholder = self(),
SupervisorMsg =
[{supervisor, {PidPlaceholder,rabbit_connection_sup}},
{started,
[{pid, PidPlaceholder},
{name,helper_sup},
{mfargs,
{rabbit_connection_helper_sup,start_link,[]}},
{restart_type,intrinsic},
{shutdown,infinity},
{child_type,supervisor}]}],
ApplicationExit =
[{application, error_logger_lager_h_test},
{exited, stopped},
{type, permanent}],
error_logger:info_report("This is not a progress message"),
error_logger:info_report(ApplicationExit),
[error_logger:info_report(progress, SupervisorMsg) || _K <- lists:seq(0, 100)],
error_logger:info_report("This is not a progress message 2"),
% Note: this gets logged in slow environments:
% Application lager started on node nonode@nohost
wait_for_count(fun lager_test_backend:count/0, [3, 4], 100, 50),
% Note: this debug msg gets ignored in slow environments:
% Lager installed handler lager_test_backend into lager_event
wait_for_count(fun lager_test_backend:count_ignored/0, [0, 1], 100, 50)
after
application:stop(lager),
application:stop(goldrush),
error_logger:tty(true)
end
end
]
}.
supressed_messages_are_not_counted_for_hwm_test_() ->
{timeout, 10000,
[fun() ->
error_logger:tty(false),
application:load(lager),
application:set_env(lager, handlers, [{lager_test_backend, debug}]),
application:set_env(lager, error_logger_redirect, true),
application:set_env(lager, error_logger_hwm, 5),
application:set_env(lager, suppress_supervisor_start_stop, true),
application:set_env(lager, suppress_application_start_stop, true),
application:unset_env(lager, crash_log),
lager:start(),
try
PidPlaceholder = self(),
SupervisorMsg =
[{supervisor, {PidPlaceholder,rabbit_connection_sup}},
{started,
[{pid, PidPlaceholder},
{name,helper_sup},
{mfargs,
{rabbit_connection_helper_sup,start_link,[]}},
{restart_type,intrinsic},
{shutdown,infinity},
{child_type,supervisor}]}],
ApplicationExit =
[{application, error_logger_lager_h_test},
{exited, stopped},
{type, permanent}],
lager_test_backend:flush(),
error_logger:info_report("This is not a progress message"),
[error_logger:info_report(ApplicationExit) || _K <- lists:seq(0, 100)],
[error_logger:info_report(progress, SupervisorMsg) || _K <- lists:seq(0, 100)],
error_logger:info_report("This is not a progress message 2"),
wait_for_count(fun lager_test_backend:count/0, 2, 100, 50),
wait_for_count(fun lager_test_backend:count_ignored/0, 0, 100, 50)
after
application:stop(lager),
application:stop(goldrush),
error_logger:tty(true)
end
end
]
}.
wait_for_message(Expected, Tries, Sleep) ->
maybe_find_expected_message(lager_test_backend:get_buffer(), Expected, Tries, Sleep).
maybe_find_expected_message(_Buffer, Expected, 0, _Sleep) ->
throw({not_found, Expected});
maybe_find_expected_message([], Expected, Tries, Sleep) ->
timer:sleep(Sleep),
maybe_find_expected_message(lager_test_backend:get_buffer(), Expected, Tries - 1, Sleep);
maybe_find_expected_message([{_Severity, _Date, Msg, _Metadata}|T], Expected, Tries, Sleep) ->
case lists:flatten(Msg) of
Expected ->
ok;
_ ->
maybe_find_expected_message(T, Expected, Tries, Sleep)
end.
wait_for_count(Fun, _Expected, 0, _Sleep) ->
Actual = Fun(),
Msg = io_lib:format("wait_for_count: fun ~p final value: ~p~n", [Fun, Actual]),
throw({failed, Msg});
wait_for_count(Fun, Expected, Tries, Sleep) when is_list(Expected) ->
Actual = Fun(),
case lists:member(Actual, Expected) of
true ->
ok;
false ->
timer:sleep(Sleep),
wait_for_count(Fun, Expected, Tries - 1, Sleep)
end;
wait_for_count(Fun, Expected, Tries, Sleep) ->
case Fun() of
Expected ->
ok;
_ ->
timer:sleep(Sleep),
wait_for_count(Fun, Expected, Tries - 1, Sleep)
end.
-endif.