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
| | # Copyright (C) 2020 all contributors <meta@public-inbox.org>
# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
# Qspawn filter
package PublicInbox::GzipFilter;
use strict;
use parent qw(Exporter);
use Compress::Raw::Zlib qw(Z_FINISH Z_OK);
our @EXPORT_OK = qw(gzip_maybe);
my %OPT = (-WindowBits => 15 + 16, -AppendOutput => 1);
sub new { bless {}, shift }
# for Qspawn if using $env->{'pi-httpd.async'}
sub attach {
my ($self, $fh) = @_;
$self->{fh} = $fh;
$self
}
sub gzip_maybe ($) {
my ($env) = @_;
return if (($env->{HTTP_ACCEPT_ENCODING}) // '') !~ /\bgzip\b/;
# in case Plack::Middleware::Deflater is loaded:
$env->{'plack.skip-deflater'} = 1;
my ($gz, $err) = Compress::Raw::Zlib::Deflate->new(%OPT);
$err == Z_OK ? $gz : undef;
}
# for GetlineBody (via Qspawn) when NOT using $env->{'pi-httpd.async'}
sub translate ($$) {
my $self = $_[0];
# allocate the zlib context lazily here, instead of in ->new.
# Deflate contexts are memory-intensive and this object may
# be sitting in the Qspawn limiter queue for a while.
my $gz = $self->{gz} //= do {
my ($g, $err) = Compress::Raw::Zlib::Deflate->new(%OPT);
$err == Z_OK or die "Deflate->new failed: $err";
$g;
};
my $zbuf = delete($self->{zbuf});
if (defined $_[1]) { # my $buf = $_[1];
my $err = $gz->deflate($_[1], $zbuf);
die "gzip->deflate: $err" if $err != Z_OK;
return $zbuf if length($zbuf) >= 8192;
$self->{zbuf} = $zbuf;
'';
} else { # undef == EOF
my $err = $gz->flush($zbuf, Z_FINISH);
die "gzip->flush: $err" if $err != Z_OK;
$zbuf;
}
}
sub write {
# my $ret = bytes::length($_[1]); # XXX does anybody care?
$_[0]->{fh}->write(translate($_[0], $_[1]));
}
sub close {
my ($self) = @_;
my $fh = delete $self->{fh};
$fh->write(translate($self, undef));
$fh->close;
}
1;
|