From 1dd8d69beafe9ad3e2daf8d93fc3eefe2b81b707 Mon Sep 17 00:00:00 2001
From: Siri Hansen <siri@erlang.org>
Date: Tue, 26 Feb 2019 13:30:19 +0100
Subject: [logger] Improve formatter performance
---
lib/kernel/src/logger_formatter.erl | 71 +++++++++++++++++++++++++++++++------
1 file changed, 60 insertions(+), 11 deletions(-)
(limited to 'lib/kernel/src')
diff --git a/lib/kernel/src/logger_formatter.erl b/lib/kernel/src/logger_formatter.erl
index ded89bac9f..8696adbd72 100644
--- a/lib/kernel/src/logger_formatter.erl
+++ b/lib/kernel/src/logger_formatter.erl
@@ -64,7 +64,7 @@ format(#{level:=Level,msg:=Msg0,meta:=Meta},Config0)
Config;
Size0 ->
Size =
- case Size0 - string:length([B,A]) of
+ case Size0 - io_lib:chars_length([B,A]) of
S when S>=0 -> S;
_ -> 0
end,
@@ -75,7 +75,11 @@ format(#{level:=Level,msg:=Msg0,meta:=Meta},Config0)
true ->
%% Trim leading and trailing whitespaces, and replace
%% newlines with ", "
- re:replace(string:trim(MsgStr0),",?\r?\n\s*",", ",
+ T = lists:reverse(
+ trim(
+ lists:reverse(
+ trim(MsgStr0,false)),true)),
+ re:replace(T,",?\r?\n\s*",", ",
[{return,list},global,unicode]);
_false ->
MsgStr0
@@ -83,7 +87,26 @@ format(#{level:=Level,msg:=Msg0,meta:=Meta},Config0)
true ->
""
end,
- truncate([B,MsgStr,A],maps:get(max_size,Config)).
+ truncate(B,MsgStr,A,maps:get(max_size,Config)).
+
+trim([H|T],Rev) when H==$\s; H==$\r; H==$\n ->
+ trim(T,Rev);
+trim([H|T],false) when is_list(H) ->
+ case trim(H,false) of
+ [] ->
+ trim(T,false);
+ TrimmedH ->
+ [TrimmedH|T]
+ end;
+trim([H|T],true) when is_list(H) ->
+ case trim(lists:reverse(H),true) of
+ [] ->
+ trim(T,true);
+ TrimmedH ->
+ [lists:reverse(TrimmedH)|T]
+ end;
+trim(String,_) ->
+ String.
do_format(Level,Data,[level|Format],Config) ->
[to_string(level,Level,Config)|do_format(Level,Data,Format,Config)];
@@ -239,21 +262,47 @@ chardata_to_list(Chardata) ->
throw(Error)
end.
-truncate(String,unlimited) ->
- String;
-truncate(String,Size) ->
- Length = string:length(String),
+truncate(B,Msg,A,unlimited) ->
+ [B,Msg,A];
+truncate(B,Msg,A,Size) ->
+ String = [B,Msg,A],
+ Length = io_lib:chars_length(String),
if Length>Size ->
- case lists:reverse(lists:flatten(String)) of
- [$\n|_] ->
- string:slice(String,0,Size-4)++"...\n";
+ {Last,FlatString} =
+ case A of
+ [] ->
+ case Msg of
+ [] ->
+ {get_last(B),lists:flatten(B)};
+ _ ->
+ {get_last(Msg),lists:flatten([B,Msg])}
+ end;
+ _ ->
+ {get_last(A),lists:flatten(String)}
+ end,
+ case Last of
+ $\n->
+ lists:sublist(FlatString,1,Size-4)++"...\n";
_ ->
- string:slice(String,0,Size-3)++"..."
+ lists:sublist(FlatString,1,Size-3)++"..."
end;
true ->
String
end.
+get_last(L) ->
+ get_first(lists:reverse(L)).
+
+get_first([]) ->
+ error;
+get_first([C|_]) when is_integer(C) ->
+ C;
+get_first([L|Rest]) when is_list(L) ->
+ case get_last(L) of
+ error -> get_first(Rest);
+ First -> First
+ end.
+
%% SysTime is the system time in microseconds
format_time(SysTime,#{time_offset:=Offset,time_designator:=Des})
when is_integer(SysTime) ->
--
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