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nixpkgs/nixos/lib/test-driver/Logger.pm
aszlig cb796ccd09
nixos/test-driver/Logger: Replace invalid UTF-8
Regression introduced by d84741a4bf.

The mentioned commit actually is a good thing, because we now get the
output from the X session.

Unfortunately, for the i3wm test, the i3-config-wizard prints out the
raw keyboard symbols directly coming from xcb, so the output isn't
necessarily proper UTF-8.

As the XML::Writer already expects valid UTF-8 input, we assume that
everything that comes into sanitise() will be UTF-8 from the start. So
we just decode() it using FB_DEFAULT as the check argument so that
every invalid character is replaced by the unicode replacement
character:

https://en.wikipedia.org/wiki/Specials_(Unicode_block)#Replacement_character

We simply re-oncode it again afterwards and return it, so we should
always get out valid UTF-8 in the log XML.

For more information about FB_DEFAULT and FB_CROAK, have a look at:

http://search.cpan.org/~dankogai/Encode-2.84/Encode.pm#Handling_Malformed_Data

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
2016-05-26 14:24:33 +02:00

73 lines
1.6 KiB
Perl

package Logger;
use strict;
use Thread::Queue;
use XML::Writer;
use Encode qw(decode encode);
sub new {
my ($class) = @_;
my $logFile = defined $ENV{LOGFILE} ? "$ENV{LOGFILE}" : "/dev/null";
my $log = new XML::Writer(OUTPUT => new IO::File(">$logFile"));
my $self = {
log => $log,
logQueue => Thread::Queue->new()
};
$self->{log}->startTag("logfile");
bless $self, $class;
return $self;
}
sub close {
my ($self) = @_;
$self->{log}->endTag("logfile");
$self->{log}->end;
}
sub drainLogQueue {
my ($self) = @_;
while (defined (my $item = $self->{logQueue}->dequeue_nb())) {
$self->{log}->dataElement("line", sanitise($item->{msg}), 'machine' => $item->{machine}, 'type' => 'serial');
}
}
sub maybePrefix {
my ($msg, $attrs) = @_;
$msg = $attrs->{machine} . ": " . $msg if defined $attrs->{machine};
return $msg;
}
sub nest {
my ($self, $msg, $coderef, $attrs) = @_;
print STDERR maybePrefix("$msg\n", $attrs);
$self->{log}->startTag("nest");
$self->{log}->dataElement("head", $msg, %{$attrs});
$self->drainLogQueue();
eval { &$coderef };
my $res = $@;
$self->drainLogQueue();
$self->{log}->endTag("nest");
die $@ if $@;
}
sub sanitise {
my ($s) = @_;
$s =~ s/[[:cntrl:]\xff]//g;
$s = decode('UTF-8', $s, Encode::FB_DEFAULT);
return encode('UTF-8', $s, Encode::FB_CROAK);
}
sub log {
my ($self, $msg, $attrs) = @_;
chomp $msg;
print STDERR maybePrefix("$msg\n", $attrs);
$self->drainLogQueue();
$self->{log}->dataElement("line", $msg, %{$attrs});
}
1;