# Copyright (C) 2020 all contributors
# License: AGPL-3.0+
# Writes PublicInbox::Eml objects atomically to a mbox variant or Maildir
package PublicInbox::LeiToMail;
use strict;
use v5.10.1;
use PublicInbox::Eml;
use PublicInbox::Lock;
use PublicInbox::ProcessPipe;
use PublicInbox::Spawn qw(which spawn);
use Symbol qw(gensym);
use File::Temp ();
use IO::Handle; # ->autoflush
my %kw2char = ( # Maildir characters
draft => 'D',
flagged => 'F',
answered => 'R',
seen => 'S'
);
my %kw2status = (
flagged => [ 'X-Status' => 'F' ],
answered => [ 'X-Status' => 'A' ],
seen => [ 'Status' => 'R' ],
draft => [ 'X-Status' => 'T' ],
);
sub _mbox_hdr_buf ($$$) {
my ($eml, $type, $kw) = @_;
$eml->header_set($_) for (qw(Lines Bytes Content-Length));
my %hdr; # set Status, X-Status
for my $k (@$kw) {
if (my $ent = $kw2status{$k}) {
push @{$hdr{$ent->[0]}}, $ent->[1];
} else { # X-Label?
warn "TODO: keyword `$k' not supported for mbox\n";
}
}
while (my ($name, $chars) = each %hdr) {
$eml->header_set($name, join('', sort @$chars));
}
my $buf = delete $eml->{hdr};
# fixup old bug from import (pre-a0c07cba0e5d8b6a)
$$buf =~ s/\A[\r\n]*From [^\r\n]*\r?\n//s;
substr($$buf, 0, 0, # prepend From line
"From lei\@$type Thu Jan 1 00:00:00 1970$eml->{crlf}");
$buf;
}
sub write_in_full ($$$) {
my ($fh, $buf, $atomic) = @_;
if ($atomic) {
defined(my $w = syswrite($fh, $$buf)) or die "write: $!";
$w == length($$buf) or die "short write: $w != ".length($$buf);
} else {
print $fh $$buf or die "print: $!";
}
}
sub eml2mboxrd ($;$) {
my ($eml, $kw) = @_;
my $buf = _mbox_hdr_buf($eml, 'mboxrd', $kw);
if (my $bdy = delete $eml->{bdy}) {
$$bdy =~ s/^(>*From )/>$1/gm;
$$buf .= $eml->{crlf};
substr($$bdy, 0, 0, $$buf); # prepend header
$buf = $bdy;
}
$$buf .= $eml->{crlf};
$buf;
}
sub eml2mboxo {
my ($eml, $kw) = @_;
my $buf = _mbox_hdr_buf($eml, 'mboxo', $kw);
if (my $bdy = delete $eml->{bdy}) {
$$bdy =~ s/^From />From /gm;
$$buf .= $eml->{crlf};
substr($$bdy, 0, 0, $$buf); # prepend header
$buf = $bdy;
}
$$buf .= $eml->{crlf};
$buf;
}
# mboxcl still escapes "From " lines
sub eml2mboxcl {
my ($eml, $kw) = @_;
my $buf = _mbox_hdr_buf($eml, 'mboxcl', $kw);
my $crlf = $eml->{crlf};
if (my $bdy = delete $eml->{bdy}) {
$$bdy =~ s/^From />From /gm;
$$buf .= 'Content-Length: '.length($$bdy).$crlf.$crlf;
substr($$bdy, 0, 0, $$buf); # prepend header
$buf = $bdy;
}
$$buf .= $crlf;
$buf;
}
# mboxcl2 has no "From " escaping
sub eml2mboxcl2 {
my ($eml, $kw) = @_;
my $buf = _mbox_hdr_buf($eml, 'mboxcl2', $kw);
my $crlf = $eml->{crlf};
if (my $bdy = delete $eml->{bdy}) {
$$buf .= 'Content-Length: '.length($$bdy).$crlf.$crlf;
substr($$bdy, 0, 0, $$buf); # prepend header
$buf = $bdy;
}
$$buf .= $crlf;
$buf;
}
sub mkmaildir ($) {
my ($maildir) = @_;
for (qw(new tmp cur)) {
my $d = "$maildir/$_";
next if -d $d;
require File::Path;
if (!File::Path::mkpath($d) && !-d $d) {
die "failed to mkpath($d): $!\n";
}
}
}
sub git_to_mail { # git->cat_async callback
my ($bref, $oid, $type, $size, $arg) = @_;
if ($type ne 'blob') {
if ($type eq 'missing') {
warn "missing $oid\n";
} else {
warn "unexpected type=$type for $oid\n";
}
}
if ($size > 0) {
my ($write_cb, $kw) = @$arg;
$write_cb->($bref, $oid, $kw);
}
}
sub reap_compress { # dwaitpid callback
my ($lei, $pid) = @_;
my $cmd = delete $lei->{"pid.$pid"};
return if $? == 0;
$lei->fail("@$cmd failed", $? >> 8);
}
sub compress_dst {
my ($out, $sfx, $lei) = @_;
my $cmd = [];
if ($sfx eq 'gz') {
$cmd->[0] = which($lei->{env}->{GZIP} // 'pigz') //
which('gzip') //
die "pigz or gzip missing for $sfx\n";
# TODO: use IO::Compress::Gzip
push @$cmd, '-c'; # stdout
push @$cmd, '--rsyncable' if $lei->{opt}->{rsyncable};
} else {
die "TODO $sfx"
}
pipe(my ($r, $w)) or die "pipe: $!";
my $rdr = { 0 => $r, 1 => $out, 2 => $lei->{2} };
my $pid = spawn($cmd, $lei->{env}, $rdr);
$lei->{"pid.$pid"} = $cmd;
my $pp = gensym;
tie *$pp, 'PublicInbox::ProcessPipe', $pid, $w, \&reap_compress, $lei;
my $tmp = File::Temp->new("$sfx.lock-XXXXXX", TMPDIR => 1);
my $pipe_lk = ($lei->{opt}->{jobs} // 0) > 1 ? bless({
lock_path => $tmp->filename,
tmp => $tmp
}, 'PublicInbox::Lock') : undef;
($pp, $pipe_lk);
}
sub write_cb {
my ($cls, $dst, $lei) = @_;
if ($dst =~ s!\A(mbox(?:rd|cl|cl2|o))?:!!) {
my $m = "eml2$1";
my $eml2mbox = $cls->can($m) or die "$cls->$m missing";
my ($out, $pipe_lk);
open $out, '>>', $dst or die "open $dst: $!";
my $atomic = !!(($lei->{opt}->{jobs} // 0) > 1);
if ($dst =~ /\.(gz|bz2|xz)\z/) {
($out, $pipe_lk) = compress_dst($out, $1, $lei);
}
sub {
my ($buf, $oid, $kw) = @_;
$buf = $eml2mbox->(PublicInbox::Eml->new($buf), $kw);
my $lock = $pipe_lk->lock_for_scope if $pipe_lk;
write_in_full($out, $buf, $atomic);
}
}
}
1;