+# Copyright (C) 2018 all contributors <meta@public-inbox.org>
+# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+
+# This interface wraps and mimics PublicInbox::Import
+package PublicInbox::V2Writable;
+use strict;
+use warnings;
+use Fcntl qw(:flock :DEFAULT);
+use PublicInbox::SearchIdx;
+use PublicInbox::MIME;
+use PublicInbox::Git;
+use PublicInbox::Import;
+use Email::MIME::ContentType;
+$Email::MIME::ContentType::STRICT_PARAMS = 0;
+
+# an estimate of the post-packed size to the raw uncompressed size
+my $PACKING_FACTOR = 0.4;
+
+sub new {
+ my ($class, $v2ibx, $creat) = @_;
+ my $dir = $v2ibx->{mainrepo} or die "no mainrepo in inbox\n";
+ unless (-d $dir) {
+ if ($creat) {
+ require File::Path;
+ File::Path::mkpath($dir);
+ } else {
+ die "$dir does not exist\n";
+ }
+ }
+ my $self = {
+ -inbox => $v2ibx,
+ im => undef, # PublicInbox::Import
+ xap_rw => undef, # PublicInbox::V2SearchIdx
+ xap_ro => undef,
+
+ # limit each repo to 1GB or so
+ rotate_bytes => int((100 * 1024 * 1024) / $PACKING_FACTOR),
+ };
+ bless $self, $class
+}
+
+# returns undef on duplicate or spam
+# mimics Import::add and wraps it for v2
+sub add {
+ my ($self, $mime, $check_cb) = @_;
+ my $existing = $self->lookup_content($mime);
+
+ if ($existing) {
+ return undef if $existing->type eq 'mail'; # duplicate
+ }
+
+ my $im = $self->importer;
+
+ # im->add returns undef if check_cb fails
+ my $cmt = $im->add($mime, $check_cb) or return;
+ $cmt = $im->get_mark($cmt);
+ my $oid = $im->{last_object_id};
+ $self->index_msg($mime, $existing, $cmt, $oid);
+ $mime;
+}
+
+sub index_msg { # TODO
+}
+
+sub remove {
+ my ($self, $mime, $msg) = @_;
+ my $existing = $self->lookup_content($mime) or return;
+
+ # don't touch ghosts or already junked messages
+ return unless $existing->type eq 'mail';
+
+ # always write removals to the current (latest) git repo since
+ # we process chronologically
+ my $im = $self->importer;
+ my ($cmt, undef) = $im->remove($mime, $msg);
+ $cmt = $im->get_mark($cmt);
+ $self->unindex_msg($existing, $cmt);
+}
+
+sub done {
+ my ($self) = @_;
+ $self->{im}->done; # PublicInbox::Import::done
+}
+
+sub checkpoint {
+ my ($self) = @_;
+ $self->{im}->checkpoint; # PublicInbox::Import::checkpoint
+}
+
+sub git_init {
+ my ($self, $new) = @_;
+ my $pfx = "$self->{-inbox}->{mainrepo}/git";
+ my $git_dir = "$pfx/$new.git";
+ die "$git_dir exists\n" if -e $git_dir;
+ my @cmd = (qw(git init --bare -q), $git_dir);
+ PublicInbox::Import::run_die(\@cmd);
+ @cmd = (qw/git config/, "--file=$git_dir/config",
+ 'repack.writeBitmaps', 'true');
+ PublicInbox::Import::run_die(\@cmd);
+
+ my $all = "$self->{-inbox}->{mainrepo}/all.git";
+ unless (-d $all) {
+ @cmd = (qw(git init --bare -q), $all);
+ PublicInbox::Import::run_die(\@cmd);
+ }
+
+ my $alt = "$all/objects/info/alternates";
+ my $new_obj_dir = "../../git/$new.git/objects";
+ my %alts;
+ if (-e $alt) {
+ open(my $fh, '<', $alt) or die "open < $alt: $!\n";
+ %alts = map { chomp; $_ => 1 } (<$fh>);
+ }
+ return $git_dir if $alts{$new_obj_dir};
+ open my $fh, '>>', $alt or die "open >> $alt: $!\n";
+ print $fh "$new_obj_dir\n" or die "print >> $alt: $!\n";
+ close $fh or die "close $alt: $!\n";
+ $git_dir
+}
+
+sub importer {
+ my ($self) = @_;
+ my $im = $self->{im};
+ if ($im) {
+ if ($im->{bytes_added} < $self->{rotate_bytes}) {
+ return $im;
+ } else {
+ $self->{im} = undef;
+ $im->done;
+ $im = undef;
+ my $git_dir = $self->git_init(++$self->{max_git});
+ my $git = PublicInbox::Git->new($git_dir);
+ return $self->import_init($git, 0);
+ }
+ }
+ my $latest;
+ my $max = -1;
+ my $new = 0;
+ my $pfx = "$self->{-inbox}->{mainrepo}/git";
+ if (-d $pfx) {
+ foreach my $git_dir (glob("$pfx/*.git")) {
+ $git_dir =~ m!/(\d+)\.git\z! or next;
+ my $n = $1;
+ if ($n > $max) {
+ $max = $n;
+ $latest = $git_dir;
+ }
+ }
+ }
+ if (defined $latest) {
+ my $git = PublicInbox::Git->new($latest);
+ my $packed_bytes = $git->packed_bytes;
+ if ($packed_bytes >= $self->{rotate_bytes}) {
+ $new = $max + 1;
+ } else {
+ $self->{max_git} = $max;
+ return $self->import_init($git, $packed_bytes);
+ }
+ } else {
+ warn "latest not found in $pfx\n";
+ }
+ $self->{max_git} = $new;
+ $latest = $self->git_init($new);
+ $self->import_init(PublicInbox::Git->new($latest), 0);
+}
+
+sub import_init {
+ my ($self, $git, $packed_bytes) = @_;
+ my $im = PublicInbox::Import->new($git, undef, undef, $self->{-inbox});
+ $im->{bytes_added} = int($packed_bytes / $PACKING_FACTOR);
+ $im->{ssoma_lock} = 0;
+ $im->{path_type} = 'v2';
+ $self->{im} = $im;
+}
+
+sub lookup_content {
+ undef # TODO
+}
+
+1;