%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2017. All Rights Reserved.
%%
%% Licensed 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.
%%
%% %CopyrightEnd%
%%
-module(logger_formatter).
-export([format/2]).
-export([check_config/1]).
-include("logger_internal.hrl").
%%%-----------------------------------------------------------------
%%% Types
-type config() :: #{chars_limit=>pos_integer()| unlimited,
depth=>pos_integer() | unlimited,
legacy_header=>boolean(),
max_size=>pos_integer() | unlimited,
report_cb=>fun((logger:report()) -> {io:format(),[term()]}),
single_line=>boolean(),
template=>template(),
time_designator=>byte(),
time_offset=>integer()|[byte()]}.
-type template() :: [atom()|tuple()|string()].
%%%-----------------------------------------------------------------
%%% API
-spec format(LogEvent,Config) -> unicode:chardata() when
LogEvent :: logger:log_event(),
Config :: config().
format(#{level:=Level,msg:=Msg0,meta:=Meta},Config0)
when is_map(Config0) ->
Config = add_default_config(Config0),
Meta1 = maybe_add_legacy_header(Level,Meta,Config),
Template = maps:get(template,Config),
{BT,AT0} = lists:splitwith(fun(msg) -> false; (_) -> true end, Template),
{DoMsg,AT} =
case AT0 of
[msg|Rest] -> {true,Rest};
_ ->{false,AT0}
end,
B = do_format(Level,Meta1,BT,Config),
A = do_format(Level,Meta1,AT,Config),
MsgStr =
if DoMsg ->
Config1 =
case maps:get(chars_limit,Config) of
unlimited ->
Config;
Size0 ->
Size =
case Size0 - string:length([B,A]) of
S when S>=0 -> S;
_ -> 0
end,
Config#{chars_limit=>Size}
end,
MsgStr0 = format_msg(Msg0,Meta1,Config1),
case maps:get(single_line,Config) of
true ->
%% Trim leading and trailing whitespaces, and replace
%% newlines with ", "
re:replace(string:trim(MsgStr0),",?\r?\n\s*",", ",
[{return,list},global]);
_false ->
MsgStr0
end;
true ->
""
end,
truncate(B ++ MsgStr ++ A,maps:get(max_size,Config)).
do_format(Level,Data,[level|Format],Config) ->
[to_string(level,Level,Config)|do_format(Level,Data,Format,Config)];
do_format(Level,Data,[{Key,IfExist,Else}|Format],Config) ->
String =
case value(Key,Data) of
{ok,Value} -> do_format(Level,Data#{Key=>Value},IfExist,Config);
error -> do_format(Level,Data,Else,Config)
end,
[String|do_format(Level,Data,Format,Config)];
do_format(Level,Data,[Key|Format],Config)
when is_atom(Key) orelse
(is_list(Key) andalso is_atom(hd(Key))) ->
String =
case value(Key,Data) of
{ok,Value} -> to_string(Key,Value,Config);
error -> ""
end,
[String|do_format(Level,Data,Format,Config)];
do_format(Level,Data,[Str|Format],Config) ->
[Str|do_format(Level,Data,Format,Config)];
do_format(_Level,_Data,[],_Config) ->
[].
value(Key,Meta) when is_map_key(Key,Meta) ->
{ok,maps:get(Key,Meta)};
value([Key|Keys],Meta) when is_map_key(Key,Meta) ->
value(Keys,maps:get(Key,Meta));
value([],Value) ->
{ok,Value};
value(_,_) ->
error.
to_string(time,Time,Config) ->
format_time(Time,Config);
to_string(mfa,MFA,_Config) ->
format_mfa(MFA);
to_string(_,Value,_Config) ->
to_string(Value).
to_string(X) when is_atom(X) ->
atom_to_list(X);
to_string(X) when is_integer(X) ->
integer_to_list(X);
to_string(X) when is_pid(X) ->
pid_to_list(X);
to_string(X) when is_reference(X) ->
ref_to_list(X);
to_string(X) when is_list(X) ->
case io_lib:printable_unicode_list(lists:flatten(X)) of
true -> X;
_ -> io_lib:format("~tp",[X])
end;
to_string(X) ->
io_lib:format("~tp",[X]).
format_msg({string,Chardata},Meta,Config) ->
format_msg({"~ts",[Chardata]},Meta,Config);
format_msg({report,_}=Msg,Meta,#{report_cb:=Fun}=Config) when is_function(Fun,1) ->
format_msg(Msg,Meta#{report_cb=>Fun},maps:remove(report_cb,Config));
format_msg({report,Report},#{report_cb:=Fun}=Meta,Config) when is_function(Fun,1) ->
try Fun(Report) of
{Format,Args} when is_list(Format), is_list(Args) ->
format_msg({Format,Args},maps:remove(report_cb,Meta),Config);
Other ->
format_msg({"REPORT_CB ERROR: ~tp; Returned: ~tp",
[Report,Other]},Meta,Config)
catch C:R ->
format_msg({"REPORT_CB CRASH: ~tp; Reason: ~tp",
[Report,{C,R}]},Meta,Config)
end;
format_msg({report,Report},Meta,Config) ->
format_msg({report,Report},
Meta#{report_cb=>fun logger:format_report/1},
Config);
format_msg(Msg,_Meta,#{depth:=Depth,chars_limit:=CharsLimit}) ->
limit_size(Msg, Depth, CharsLimit).
limit_size(Msg,Depth,unlimited) ->
limit_size(Msg,Depth,[]);
limit_size(Msg,Depth,CharsLimit) when is_integer(CharsLimit) ->
limit_size(Msg,Depth,[{chars_limit,CharsLimit}]);
limit_size({Format,Args},unlimited,Opts) when is_list(Opts) ->
try io_lib:format(Format,Args,Opts)
catch _:_ ->
io_lib:format("FORMAT ERROR: ~tp - ~tp",[Format,Args],Opts)
end;
limit_size({Format0,Args},Depth,Opts) when is_integer(Depth) ->
try
Format1 = io_lib:scan_format(Format0, Args),
Format = limit_format(Format1, Depth),
io_lib:build_text(Format,Opts)
catch _:_ ->
limit_size({"FORMAT ERROR: ~tp - ~tp",[Format0,Args]},Depth,Opts)
end.
limit_format([#{control_char:=C0}=M0|T], Depth) when C0 =:= $p;
C0 =:= $w ->
C = C0 - ($a - $A), %To uppercase.
#{args:=Args} = M0,
M = M0#{control_char:=C,args:=Args++[Depth]},
[M|limit_format(T, Depth)];
limit_format([H|T], Depth) ->
[H|limit_format(T, Depth)];
limit_format([], _) ->
[].
truncate(String,unlimited) ->
String;
truncate(String,Size) ->
Length = string:length(String),
if Length>Size ->
case lists:reverse(lists:flatten(String)) of
[$\n|_] ->
string:slice(String,0,Size-4)++"...\n";
_ ->
string:slice(String,0,Size-3)++"..."
end;
true ->
String
end.
%% SysTime is the system time in microseconds
format_time(SysTime,#{time_offset:=Offset,time_designator:=Des})
when is_integer(SysTime) ->
calendar:system_time_to_rfc3339(SysTime,[{unit,microsecond},
{offset,Offset},
{time_designator,Des}]).
%% SysTime is the system time in microseconds
timestamp_to_datetimemicro(SysTime,Config) when is_integer(SysTime) ->
Micro = SysTime rem 1000000,
Sec = SysTime div 1000000,
UniversalTime = erlang:posixtime_to_universaltime(Sec),
{{Date,Time},UtcStr} =
case offset_to_utc(maps:get(time_offset,Config)) of
true -> {UniversalTime,"UTC "};
_ -> {erlang:universaltime_to_localtime(UniversalTime),""}
end,
{Date,Time,Micro,UtcStr}.
format_mfa({M,F,A}) when is_atom(M), is_atom(F), is_integer(A) ->
atom_to_list(M)++":"++atom_to_list(F)++"/"++integer_to_list(A);
format_mfa({M,F,A}) when is_atom(M), is_atom(F), is_list(A) ->
format_mfa({M,F,length(A)});
format_mfa(MFA) ->
to_string(MFA).
maybe_add_legacy_header(Level,
#{time:=Timestamp}=Meta,
#{legacy_header:=true}=Config) ->
#{title:=Title}=MyMeta = add_legacy_title(Level,Meta,Config),
{{Y,Mo,D},{H,Mi,S},Micro,UtcStr} =
timestamp_to_datetimemicro(Timestamp,Config),
Header =
io_lib:format("=~ts==== ~w-~s-~4w::~2..0w:~2..0w:~2..0w.~6..0w ~s===",
[Title,D,month(Mo),Y,H,Mi,S,Micro,UtcStr]),
Meta#{?MODULE=>MyMeta#{header=>Header}};
maybe_add_legacy_header(_,Meta,_) ->
Meta.
add_legacy_title(_Level,#{?MODULE:=#{title:=_}=MyMeta},_) ->
MyMeta;
add_legacy_title(Level,Meta,Config) ->
case maps:get(?MODULE,Meta,#{}) of
#{title:=_}=MyMeta ->
MyMeta;
MyMeta ->
TitleLevel =
case (Level=:=notice andalso maps:find(error_logger,Meta)) of
{ok,_} ->
maps:get(error_logger_notice_header,Config);
_ ->
Level
end,
Title = string:uppercase(atom_to_list(TitleLevel)) ++ " REPORT",
MyMeta#{title=>Title}
end.
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".
%% Ensure that all valid configuration parameters exist in the final
%% configuration map
add_default_config(Config0) ->
Default =
#{legacy_header=>false,
error_logger_notice_header=>info,
single_line=>true,
chars_limit=>unlimited,
time_designator=>$T},
MaxSize = get_max_size(maps:get(max_size,Config0,undefined)),
Depth = get_depth(maps:get(depth,Config0,undefined)),
Offset = get_offset(maps:get(time_offset,Config0,undefined)),
add_default_template(maps:merge(Default,Config0#{max_size=>MaxSize,
depth=>Depth,
time_offset=>Offset})).
add_default_template(#{template:=_}=Config) ->
Config;
add_default_template(Config) ->
Config#{template=>default_template(Config)}.
default_template(#{legacy_header:=true}) ->
?DEFAULT_FORMAT_TEMPLATE_HEADER;
default_template(#{single_line:=true}) ->
?DEFAULT_FORMAT_TEMPLATE_SINGLE;
default_template(_) ->
?DEFAULT_FORMAT_TEMPLATE.
get_max_size(undefined) ->
unlimited;
get_max_size(S) ->
max(10,S).
get_depth(undefined) ->
error_logger:get_format_depth();
get_depth(S) ->
max(5,S).
get_offset(undefined) ->
utc_to_offset(get_utc_config());
get_offset(Offset) ->
Offset.
utc_to_offset(true) ->
"Z";
utc_to_offset(false) ->
"".
get_utc_config() ->
%% SASL utc_log overrides stdlib config - in order to have uniform
%% timestamps in log messages
case application:get_env(sasl, utc_log) of
{ok, Val} when is_boolean(Val) -> Val;
_ ->
case application:get_env(stdlib, utc_log) of
{ok, Val} when is_boolean(Val) -> Val;
_ -> false
end
end.
offset_to_utc(Z) when Z=:=0; Z=:="z"; Z=:="Z" ->
true;
offset_to_utc([$+|Tz]) ->
case io_lib:fread("~d:~d", Tz) of
{ok, [0, 0], []} ->
true;
_ ->
false
end;
offset_to_utc(_) ->
false.
-spec check_config(Config) -> ok | {error,term()} when
Config :: config().
check_config(Config) when is_map(Config) ->
do_check_config(maps:to_list(Config));
check_config(Config) ->
{error,{invalid_formatter_config,?MODULE,Config}}.
do_check_config([{Type,L}|Config]) when Type == chars_limit;
Type == depth;
Type == max_size ->
case check_limit(L) of
ok -> do_check_config(Config);
error -> {error,{invalid_formatter_config,?MODULE,{Type,L}}}
end;
do_check_config([{single_line,SL}|Config]) when is_boolean(SL) ->
do_check_config(Config);
do_check_config([{legacy_header,LH}|Config]) when is_boolean(LH) ->
do_check_config(Config);
do_check_config([{error_logger_notice_header,ELNH}|Config]) when ELNH == info;
ELNH == notice ->
do_check_config(Config);
do_check_config([{report_cb,RCB}|Config]) when is_function(RCB,1) ->
do_check_config(Config);
do_check_config([{template,T}|Config]) ->
case check_template(T) of
ok -> do_check_config(Config);
error -> {error,{invalid_formatter_template,?MODULE,T}}
end;
do_check_config([{time_offset,Offset}|Config]) ->
case check_offset(Offset) of
ok ->
do_check_config(Config);
error ->
{error,{invalid_formatter_config,?MODULE,{time_offset,Offset}}}
end;
do_check_config([{time_designator,Char}|Config]) when Char>=0, Char=<255 ->
case io_lib:printable_latin1_list([Char]) of
true ->
do_check_config(Config);
false ->
{error,{invalid_formatter_config,?MODULE,{time_designator,Char}}}
end;
do_check_config([C|_]) ->
{error,{invalid_formatter_config,?MODULE,C}};
do_check_config([]) ->
ok.
check_limit(L) when is_integer(L), L>0 ->
ok;
check_limit(unlimited) ->
ok;
check_limit(_) ->
error.
check_template([Key|T]) when is_atom(Key) ->
check_template(T);
check_template([Key|T]) when is_list(Key), is_atom(hd(Key)) ->
case lists:all(fun(X) when is_atom(X) -> true;
(_) -> false
end,
Key) of
true ->
check_template(T);
false ->
error
end;
check_template([{Key,IfExist,Else}|T])
when is_atom(Key) orelse
(is_list(Key) andalso is_atom(hd(Key))) ->
case check_template(IfExist) of
ok ->
case check_template(Else) of
ok ->
check_template(T);
error ->
error
end;
error ->
error
end;
check_template([Str|T]) when is_list(Str) ->
case io_lib:printable_unicode_list(Str) of
true -> check_template(T);
false -> error
end;
check_template([]) ->
ok;
check_template(_) ->
error.
check_offset(I) when is_integer(I) ->
ok;
check_offset(Tz) when Tz=:=""; Tz=:="Z"; Tz=:="z" ->
ok;
check_offset([Sign|Tz]) when Sign=:=$+; Sign=:=$- ->
check_timezone(Tz);
check_offset(_) ->
error.
check_timezone(Tz) ->
try io_lib:fread("~d:~d", Tz) of
{ok, [_, _], []} ->
ok;
_ ->
error
catch _:_ ->
error
end.
