# 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 popen_rd);
use PublicInbox::LeiDedupe;
use Symbol qw(gensym);
use IO::Handle; # ->autoflush
use Fcntl qw(SEEK_SET SEEK_END);
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;
}
$$buf .= $crlf;
$buf;
}
sub mkmaildir ($) {
my ($maildir) = @_;
for (qw(new tmp cur)) {
my $d = "$maildir/$_";
next if -d $d;
require File::Path;
if (!File::Path::mkpath($d) && !-d $d) {
die "failed to mkpath($d): $!\n";
}
}
}
sub git_to_mail { # git->cat_async callback
my ($bref, $oid, $type, $size, $arg) = @_;
if ($type ne 'blob') {
if ($type eq 'missing') {
warn "missing $oid\n";
} else {
warn "unexpected type=$type for $oid\n";
}
}
if ($size > 0) {
my ($write_cb, $kw) = @$arg;
$write_cb->($bref, $oid, $kw);
}
}
sub reap_compress { # dwaitpid callback
my ($lei, $pid) = @_;
my $cmd = delete $lei->{"pid.$pid"};
return if $? == 0;
$lei->fail("@$cmd failed", $? >> 8);
}
# all of these support -c for stdout and -d for decompression,
# mutt is commonly distributed with hooks for gz, bz2 and xz, at least
# { foo => '' } means "--foo" is passed to the command-line,
# otherwise { foo => '--bar' } passes "--bar"
our %zsfx2cmd = (
gz => [ qw(GZIP pigz gzip), {
rsyncable => '', threads => '-p' } ],
bz2 => [ 'bzip2', {} ],
xz => [ 'xz', { threads => '-T' } ],
# XXX does anybody care for these? I prefer zstd on entire FSes,
# so it's probably not necessary on a per-file basis
# zst => [ 'zstd', { -default => [ qw(-q) ], # it's noisy by default
# rsyncable => '', threads => '-T' } ],
# zz => [ 'pigz', { -default => [ '--zlib' ],
# rsyncable => '', threads => '-p' }],
# lzo => [ 'lzop', {} ],
# lzma => [ 'lzma', {} ],
);
sub zsfx2cmd ($$$) {
my ($zsfx, $decompress, $lei) = @_;
my $x = $zsfx2cmd{$zsfx} // die "no support for suffix=.$zsfx";
my @info = @$x;
my $cmd_opt = pop @info;
my @cmd = (undef, $decompress ? qw(-dc) : qw(-c));
for my $exe (@info) {
# I think respecting client's ENV{GZIP} is OK, not sure
# about ENV overrides for other, less-common compressors
if ($exe eq uc($exe)) {
$exe = $lei->{env}->{$exe} or next;
}
$cmd[0] = which($exe) and last;
}
$cmd[0] // die join(' or ', @info)." missing for .$zsfx";
# push @cmd, @{$cmd_opt->{-default}} if $cmd_opt->{-default};
for my $bool (qw(rsyncable)) {
my $switch = $cmd_opt->{rsyncable} // next;
push @cmd, '--'.($switch || $bool);
}
for my $key (qw(threads)) { # support compression level?
my $switch = $cmd_opt->{$key} // next;
my $val = $lei->{opt}->{$key} // next;
push @cmd, $switch, $val;
}
\@cmd;
}
sub compress_dst {
my ($out, $zsfx, $lei) = @_;
my $cmd = zsfx2cmd($zsfx, undef, $lei);
pipe(my ($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 $pipe_lk = ($lei->{opt}->{jobs} // 0) > 1 ?
PublicInbox::Lock->new_tmp($zsfx) : undef;
($pp, $pipe_lk);
}
sub decompress_src ($$$) {
my ($in, $zsfx, $lei) = @_;
my $cmd = zsfx2cmd($zsfx, 1, $lei);
my $rdr = { 0 => $in, 2 => $lei->{2} };
popen_rd($cmd, $lei->{env}, $rdr);
}
sub dup_src ($) {
my ($in) = @_;
open my $dup, '+>>&', $in or die "dup: $!";
$dup;
}
# --augment existing output destination, with deduplication
sub _augment { # MboxReader eml_cb
my ($eml, $lei) = @_;
# ignore return value, just populate the skv
$lei->{dedupe_cb}->is_dup($eml);
}
sub _mbox_write_cb ($$$$) {
my ($cls, $mbox, $dst, $lei) = @_;
my $m = "eml2$mbox";
my $eml2mbox = $cls->can($m) or die "$cls->$m missing";
my ($out, $pipe_lk, $seekable);
# XXX should we support /dev/stdout.gz ?
if ($dst eq '/dev/stdout') {
$out = $lei->{1};
} else { # TODO: mbox locking
open $out, '+>>', $dst or die "open $dst: $!";
# Perl does SEEK_END even with O_APPEND :<
$seekable = seek($out, 0, SEEK_SET);
die "seek $dst: $!\n" if !$seekable && !$!{ESPIPE};
}
my $jobs = $lei->{opt}->{jobs} // 0;
my $atomic = $jobs > 1;
my $dedupe = $lei->{dedupe} = PublicInbox::LeiDedupe->new($lei);
state $zsfx_allow = join('|', keys %zsfx2cmd);
my ($zsfx) = ($dst =~ /\.($zsfx_allow)\z/);
if ($lei->{opt}->{augment}) {
if ($seekable && -s $out && $dedupe->prepare_dedupe) {
my $rd = $zsfx ? decompress_src($out, $zsfx, $lei) :
dup_src($out);
PublicInbox::MboxReader->$mbox($rd, \&_augment, $lei);
} elsif ($seekable && !$atomic) {
seek($out, 0, SEEK_END) or die "seek: $!";
}
$dedupe->pause_dedupe if $jobs; # are we forking?
} elsif ($seekable) {
truncate($out, 0) or die "truncate $dst: $!";
}
$dedupe->prepare_dedupe if !$jobs;
($out, $pipe_lk) = compress_dst($out, $zsfx, $lei) if $zsfx;
sub {
my ($buf, $oid, $kw) = @_;
my $eml = PublicInbox::Eml->new($buf);
if (!$lei->{dedupe}->is_dup($eml, $oid)) {
$buf = $eml2mbox->($eml, $kw);
my $lock = $pipe_lk->lock_for_scope if $pipe_lk;
write_in_full($out, $buf, $atomic);
}
}
}
sub write_cb { # returns a callback for git_to_mail
my ($cls, $dst, $lei) = @_;
require PublicInbox::LeiDedupe;
if ($dst =~ s!\A(mbox(?:rd|cl|cl2|o))?:!!) {
_mbox_write_cb($cls, $1, $dst, $lei);
}
# TODO: Maildir, MH, IMAP, JMAP ...
}
1;