1 # Copyright (C) 2015-2019 all contributors <meta@public-inbox.org>
2 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
3 package PublicInbox::MboxGz;
7 use PublicInbox::Hval qw/to_filename/;
9 use IO::Compress::Gzip;
10 use Compress::Raw::Zlib qw(Z_FINISH Z_OK);
11 my %OPT = (-WindowBits => 15 + 16, -AppendOutput => 1);
14 my ($class, $ctx, $cb) = @_;
15 $ctx->{base_url} = $ctx->{-inbox}->base_url($ctx->{env});
16 my ($gz, $err) = Compress::Raw::Zlib::Deflate->new(%OPT);
17 $err == Z_OK or die "Deflate->new failed: $err";
18 bless { gz => $gz, cb => $cb, ctx => $ctx }, $class;
22 my ($class, $ctx, $cb, $fn) = @_;
23 my $body = $class->new($ctx, $cb);
24 # http://www.iana.org/assignments/media-types/application/gzip
25 my @h = qw(Content-Type application/gzip);
27 $fn = to_filename($fn);
28 push @h, 'Content-Disposition', "inline; filename=$fn.mbox.gz";
35 $ctx->{env}->{'psgi.errors'}->print("deflate failed: $err\n");
39 # called by Plack::Util::foreach or similar
42 my $ctx = $self->{ctx} or return;
44 my $buf = delete($self->{buf});
45 while (my $smsg = $self->{cb}->()) {
46 my $mref = $ctx->{-inbox}->msg_by_smsg($smsg) or next;
47 my $h = Email::Simple->new($mref)->header_obj;
49 my $err = $gz->deflate(
50 PublicInbox::Mbox::msg_hdr($ctx, $h, $smsg->{mid}),
52 return gzip_fail($ctx, $err) if $err != Z_OK;
54 $err = $gz->deflate(PublicInbox::Mbox::msg_body($$mref), $buf);
55 return gzip_fail($ctx, $err) if $err != Z_OK;
57 return $buf if length($buf) >= 8192;
59 # be fair to other clients on public-inbox-httpd:
63 # signal that we're done and can return undef next call:
65 my $err = $gz->flush($buf, Z_FINISH);
66 $err == Z_OK ? $buf : gzip_fail($ctx, $err);