aboutsummaryrefslogtreecommitdiffstats
path: root/lib/stdlib/src/error_logger_tty_h.erl
blob: fa13fbb2bdc16e32d384d764bab4fc92bdb0499c (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
%%
%% %CopyrightBegin%
%% 
%% Copyright Ericsson AB 1996-2011. 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_tty_h).

-behaviour(gen_event).

%%%
%%% A handler that can be connected to the error_logger
%%% event handler.
%%% Writes all events formatted to stdout.
%%%   Handles events tagged error, emulator and info.
%%%
%%% It can only be started from error_logger:swap_handler(tty)
%%% or error_logger:tty(true)
%%%

-export([init/1,
	 handle_event/2, handle_call/2, handle_info/2,
	 terminate/2, code_change/3]).

-export([write_event/2]).

%% This one is used when we takeover from the simple error_logger.
init({[], {error_logger, Buf}}) ->
    User = set_group_leader(),
    write_events(Buf,io),
    {ok, {User, error_logger}};
%% This one is used if someone took over from us, and now wants to
%% go back.
init({[], {error_logger_tty_h, PrevHandler}}) ->
    User = set_group_leader(),
    {ok, {User, PrevHandler}};
%% This one is used when we are started directly.
init([]) ->
    User = set_group_leader(),
    {ok, {User, []}}.
    
handle_event({_Type, GL, _Msg}, State) when node(GL) =/= node() ->
    {ok, State};
handle_event(Event, State) ->
    write_event(tag_event(Event),io),
    {ok, State}.

handle_info({'EXIT', User, _Reason}, {User, PrevHandler}) ->
    case PrevHandler of
	[] ->
	    remove_handler;
	_ -> 
	    {swap_handler, install_prev, {User, PrevHandler}, 
	     PrevHandler, go_back}
    end;
handle_info({emulator, GL, Chars}, State) when node(GL) == node() ->
    write_event(tag_event({emulator, GL, Chars}),io),
    {ok, State};
handle_info({emulator, noproc, Chars}, State) ->
    write_event(tag_event({emulator, noproc, Chars}),io),
    {ok, State};
handle_info(_, State) ->
    {ok, State}.

handle_call(_Query, State) -> {ok, {error, bad_query}, State}.

% unfortunately, we can't unlink from User - links are not counted!
%    if pid(User) -> unlink(User); true -> ok end,
terminate(install_prev, _State) ->
    [];
terminate(_Reason, {_User, PrevHandler}) ->
    {error_logger_tty_h, PrevHandler}.

code_change(_OldVsn, State, _Extra) ->
    {ok, State}.

%%% ------------------------------------------------------
%%% Misc. functions.
%%% ------------------------------------------------------

set_group_leader() ->
    case whereis(user) of
	User when is_pid(User) -> link(User), group_leader(User,self()), User;
	_                      -> false
    end.

tag_event(Event) ->    
    {erlang:localtime(), Event}.

write_events(Events,IOMod) -> write_events1(lists:reverse(Events),IOMod).

write_events1([Event|Es],IOMod) ->
    write_event(Event,IOMod),
    write_events1(Es,IOMod);
write_events1([],_IOMod) ->
    ok.

write_event({Time, {error, _GL, {Pid, Format, Args}}},IOMod) ->
    T = write_time(maybe_utc(Time)),
    case catch io_lib:format(add_node(Format,Pid), Args) of
	S when is_list(S) ->
	    format(IOMod, T ++ S);
	_ ->
	    F = add_node("ERROR: ~p - ~p~n", Pid),
	    format(IOMod, T ++ F, [Format,Args])
    end;
write_event({Time, {emulator, _GL, Chars}},IOMod) ->
    T = write_time(maybe_utc(Time)),
    case catch io_lib:format(Chars, []) of
	S when is_list(S) ->
	    format(IOMod, T ++ S);
	_ ->
	    format(IOMod, T ++ "ERROR: ~p ~n", [Chars])
    end;
write_event({Time, {info, _GL, {Pid, Info, _}}},IOMod) ->
    T = write_time(maybe_utc(Time)),
    format(IOMod, T ++ add_node("~p~n",Pid),[Info]);
write_event({Time, {error_report, _GL, {Pid, std_error, Rep}}},IOMod) ->
    T = write_time(maybe_utc(Time)),
    S = format_report(Rep),
    format(IOMod, T ++ S ++ add_node("", Pid));
write_event({Time, {info_report, _GL, {Pid, std_info, Rep}}},IOMod) ->
    T = write_time(maybe_utc(Time), "INFO REPORT"),
    S = format_report(Rep),
    format(IOMod, T ++ S ++ add_node("", Pid));
write_event({Time, {info_msg, _GL, {Pid, Format, Args}}},IOMod) ->
    T = write_time(maybe_utc(Time), "INFO REPORT"),
    case catch io_lib:format(add_node(Format,Pid), Args) of
	S when is_list(S) ->
	    format(IOMod, T ++ S);
	_ ->
	    F = add_node("ERROR: ~p - ~p~n", Pid),
	    format(IOMod, T ++ F, [Format,Args])
    end;
write_event({Time, {warning_report, _GL, {Pid, std_warning, Rep}}},IOMod) ->
    T = write_time(maybe_utc(Time), "WARNING REPORT"),
    S = format_report(Rep),
    format(IOMod, T ++ S ++ add_node("", Pid));
write_event({Time, {warning_msg, _GL, {Pid, Format, Args}}},IOMod) ->
    T = write_time(maybe_utc(Time), "WARNING REPORT"),
    case catch io_lib:format(add_node(Format,Pid), Args) of
	S when is_list(S) ->
	    format(IOMod, T ++ S);
	_ ->
	    F = add_node("ERROR: ~p - ~p~n", Pid),
	    format(IOMod, T ++ F, [Format,Args])
    end;
write_event({_Time, _Error},_IOMod) ->
    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(IOMod, String)       -> format(IOMod, String, []).
format(io_lib, String, Args) -> io_lib:format(String, Args);
format(io, String, Args) -> io:format(user, String, Args).

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".