%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1996-2009. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% 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.
%%
%% %CopyrightEnd%
%%
-module(error_logger_file_h).
-behaviour(gen_event).
%%%
%%% A handler that can be connected to the error_logger
%%% event handler.
%%% Writes all events formatted to file.
%%% Handles events tagged error, emulator and info.
%%%
%%% It can only be started from error_logger:swap_handler({logfile, File})
%%% or error_logger:logfile(File)
%%%
-export([init/1,
handle_event/2, handle_call/2, handle_info/2,
terminate/2, code_change/3]).
%% This one is used when we takeover from the simple error_logger.
init({File, {error_logger, Buf}}) ->
case init(File, error_logger) of
{ok, {Fd, File, PrevHandler}} ->
write_events(Fd, Buf),
{ok, {Fd, File, PrevHandler}};
Error ->
Error
end;
%% This one is used when we are started directly.
init(File) ->
init(File, []).
init(File, PrevHandler) ->
process_flag(trap_exit, true),
case file:open(File, [write]) of
{ok,Fd} ->
{ok, {Fd, File, PrevHandler}};
Error ->
Error
end.
handle_event({_Type, GL, _Msg}, State) when node(GL) =/= node() ->
{ok, State};
handle_event(Event, {Fd, File, PrevHandler}) ->
write_event(Fd, tag_event(Event)),
{ok, {Fd, File, PrevHandler}};
handle_event(_, State) ->
{ok, State}.
handle_info({'EXIT', Fd, _Reason}, {Fd, _File, PrevHandler}) ->
case PrevHandler of
[] ->
remove_handler;
_ ->
{swap_handler, install_prev, [], PrevHandler, go_back}
end;
handle_info({emulator, GL, Chars}, {Fd, File, PrevHandler})
when node(GL) == node() ->
write_event(Fd, tag_event({emulator, GL, Chars})),
{ok, {Fd, File, PrevHandler}};
handle_info({emulator, noproc, Chars}, {Fd, File, PrevHandler}) ->
write_event(Fd, tag_event({emulator, noproc, Chars})),
{ok, {Fd, File, PrevHandler}};
handle_info(_, State) ->
{ok, State}.
handle_call(filename, {Fd, File, Prev}) ->
{ok, File, {Fd, File, Prev}};
handle_call(_Query, State) ->
{ok, {error, bad_query}, State}.
terminate(_Reason, State) ->
case State of
{Fd, _File, _Prev} ->
ok = file:close(Fd);
_ ->
ok
end,
[].
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%%% ------------------------------------------------------
%%% Misc. functions.
%%% ------------------------------------------------------
tag_event(Event) ->
{erlang:localtime(), Event}.
write_events(Fd, Events) -> write_events1(Fd, lists:reverse(Events)).
write_events1(Fd, [Event|Es]) ->
write_event(Fd, Event),
write_events1(Fd, Es);
write_events1(_, []) ->
ok.
write_event(Fd, {Time, {error, _GL, {Pid, Format, Args}}}) ->
T = write_time(maybe_utc(Time)),
case catch io_lib:format(add_node(Format,Pid), Args) of
S when is_list(S) ->
io:format(Fd, T ++ S, []);
_ ->
F = add_node("ERROR: ~p - ~p~n", Pid),
io:format(Fd, T ++ F, [Format,Args])
end;
write_event(Fd, {Time, {emulator, _GL, Chars}}) ->
T = write_time(maybe_utc(Time)),
case catch io_lib:format(Chars, []) of
S when is_list(S) ->
io:format(Fd, T ++ S, []);
_ ->
io:format(Fd, T ++ "ERROR: ~p ~n", [Chars])
end;
write_event(Fd, {Time, {info, _GL, {Pid, Info, _}}}) ->
T = write_time(maybe_utc(Time)),
io:format(Fd, T ++ add_node("~p~n",Pid),[Info]);
write_event(Fd, {Time, {error_report, _GL, {Pid, std_error, Rep}}}) ->
T = write_time(maybe_utc(Time)),
S = format_report(Rep),
io:format(Fd, T ++ S ++ add_node("", Pid), []);
write_event(Fd, {Time, {info_report, _GL, {Pid, std_info, Rep}}}) ->
T = write_time(maybe_utc(Time), "INFO REPORT"),
S = format_report(Rep),
io:format(Fd, T ++ S ++ add_node("", Pid), []);
write_event(Fd, {Time, {info_msg, _GL, {Pid, Format, Args}}}) ->
T = write_time(maybe_utc(Time), "INFO REPORT"),
case catch io_lib:format(add_node(Format,Pid), Args) of
S when is_list(S) ->
io:format(Fd, T ++ S, []);
_ ->
F = add_node("ERROR: ~p - ~p~n", Pid),
io:format(Fd, T ++ F, [Format,Args])
end;
write_event(Fd, {Time, {warning_report, _GL, {Pid, std_warning, Rep}}}) ->
T = write_time(maybe_utc(Time), "WARNING REPORT"),
S = format_report(Rep),
io:format(Fd, T ++ S ++ add_node("", Pid), []);
write_event(Fd, {Time, {warning_msg, _GL, {Pid, Format, Args}}}) ->
T = write_time(maybe_utc(Time), "WARNING REPORT"),
case catch io_lib:format(add_node(Format,Pid), Args) of
S when is_list(S) ->
io:format(Fd, T ++ S, []);
_ ->
F = add_node("ERROR: ~p - ~p~n", Pid),
io:format(Fd, T ++ F, [Format,Args])
end;
write_event(_, _) ->
ok.
maybe_utc(Time) ->
UTC = case application:get_env(sasl, utc_log) of
{ok, Val} ->
Val;
undefined ->
%% Backwards compatible:
case application:get_env(stdlib, utc_log) of
{ok, Val} ->
Val;
undefined ->
false
end
end,
if
UTC =:= true ->
{utc, calendar:local_time_to_universal_time(Time)};
true ->
Time
end.
format_report(Rep) when is_list(Rep) ->
case string_p(Rep) of
true ->
io_lib:format("~s~n",[Rep]);
_ ->
format_rep(Rep)
end;
format_report(Rep) ->
io_lib:format("~p~n",[Rep]).
format_rep([{Tag,Data}|Rep]) ->
io_lib:format(" ~p: ~p~n",[Tag,Data]) ++ format_rep(Rep);
format_rep([Other|Rep]) ->
io_lib:format(" ~p~n",[Other]) ++ format_rep(Rep);
format_rep(_) ->
[].
add_node(X, Pid) when is_atom(X) ->
add_node(atom_to_list(X), Pid);
add_node(X, Pid) when node(Pid) =/= node() ->
lists:concat([X,"** at node ",node(Pid)," **~n"]);
add_node(X, _) ->
X.
string_p([]) ->
false;
string_p(Term) ->
string_p1(Term).
string_p1([H|T]) when is_integer(H), H >= $\s, H < 255 ->
string_p1(T);
string_p1([$\n|T]) -> string_p1(T);
string_p1([$\r|T]) -> string_p1(T);
string_p1([$\t|T]) -> string_p1(T);
string_p1([$\v|T]) -> string_p1(T);
string_p1([$\b|T]) -> string_p1(T);
string_p1([$\f|T]) -> string_p1(T);
string_p1([$\e|T]) -> string_p1(T);
string_p1([H|T]) when is_list(H) ->
case string_p1(H) of
true -> string_p1(T);
_ -> false
end;
string_p1([]) -> true;
string_p1(_) -> false.
write_time(Time) -> write_time(Time, "ERROR REPORT").
write_time({utc,{{Y,Mo,D},{H,Mi,S}}}, Type) ->
io_lib:format("~n=~s==== ~p-~s-~p::~s:~s:~s UTC ===~n",
[Type,D,month(Mo),Y,t(H),t(Mi),t(S)]);
write_time({{Y,Mo,D},{H,Mi,S}}, Type) ->
io_lib:format("~n=~s==== ~p-~s-~p::~s:~s:~s ===~n",
[Type,D,month(Mo),Y,t(H),t(Mi),t(S)]).
t(X) when is_integer(X) ->
t1(integer_to_list(X));
t(_) ->
"".
t1([X]) -> [$0,X];
t1(X) -> X.
month(1) -> "Jan";
month(2) -> "Feb";
month(3) -> "Mar";
month(4) -> "Apr";
month(5) -> "May";
month(6) -> "Jun";
month(7) -> "Jul";
month(8) -> "Aug";
month(9) -> "Sep";
month(10) -> "Oct";
month(11) -> "Nov";
month(12) -> "Dec".
