+# Copyright (C) 2021 all contributors <meta@public-inbox.org>
+# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+
+# front-end for the "lei import" sub-command
+package PublicInbox::LeiImport;
+use strict;
+use v5.10.1;
+use parent qw(PublicInbox::IPC);
+use PublicInbox::MboxReader;
+use PublicInbox::Eml;
+
+sub _import_eml { # MboxReader callback
+ my ($eml, $sto, $set_kw) = @_;
+ $sto->ipc_do('set_eml', $eml, $set_kw ? $sto->mbox_keywords($eml) : ());
+}
+
+sub import_done { # EOF callback for main daemon
+ my ($lei) = @_;
+ my $imp = delete $lei->{imp};
+ $imp->wq_wait_old($lei) if $imp;
+ my $wait = $lei->{sto}->ipc_do('done');
+ $lei->dclose;
+}
+
+sub call { # the main "lei import" method
+ my ($cls, $lei, @argv) = @_;
+ my $sto = $lei->_lei_store(1);
+ $sto->write_prepare($lei);
+ $lei->{opt}->{flags} //= 1;
+ my $fmt = $lei->{opt}->{'format'};
+ my $self = $lei->{imp} = bless {}, $cls;
+ return $lei->fail('--format unspecified') if !$fmt;
+ $self->{0} = $lei->{0} if $lei->{opt}->{stdin};
+ my $ops = {
+ '!' => [ $lei->can('fail_handler'), $lei ],
+ 'x_it' => [ $lei->can('x_it'), $lei ],
+ 'child_error' => [ $lei->can('child_error'), $lei ],
+ '' => [ \&import_done, $lei ],
+ };
+ ($lei->{pkt_op_c}, $lei->{pkt_op_p}) = PublicInbox::PktOp->pair($ops);
+ my $j = $lei->{opt}->{jobs} // scalar(@argv) || 1;
+ my $nproc = $self->detect_nproc;
+ $j = $nproc if $j > $nproc;
+ $self->wq_workers_start('lei_import', $j, $lei->oldset, {lei => $lei});
+ my $op = delete $lei->{pkt_op_c};
+ delete $lei->{pkt_op_p};
+ $self->wq_do('import_stdin', []) if $self->{0};
+ for my $x (@argv) {
+ $self->wq_do('import_path_url', [], $x);
+ }
+ $self->wq_close(1);
+ $lei->event_step_init; # wait for shutdowns
+ if ($lei->{oneshot}) {
+ while ($op->{sock}) { $op->event_step }
+ }
+}
+
+sub ipc_atfork_child {
+ my ($self) = @_;
+ $self->{lei}->lei_atfork_child;
+ $self->SUPER::ipc_atfork_child;
+}
+
+sub _import_fh {
+ my ($lei, $fh, $x) = @_;
+ my $set_kw = $lei->{opt}->{flags};
+ my $fmt = $lei->{opt}->{'format'};
+ eval {
+ if ($fmt eq 'eml') {
+ my $buf = do { local $/; <$fh> } //
+ return $lei->child_error(1 >> 8, <<"");
+ error reading $x: $!
+
+ my $eml = PublicInbox::Eml->new(\$buf);
+ _import_eml($eml, $lei->{sto}, $set_kw);
+ } else { # some mbox
+ my $cb = PublicInbox::MboxReader->can($fmt);
+ $cb or return $lei->child_error(1 >> 8, <<"");
+ --format $fmt unsupported for $x
+
+ $cb->(undef, $fh, \&_import_eml, $lei->{sto}, $set_kw);
+ }
+ };
+ $lei->child_error(1 >> 8, "<stdin>: $@") if $@;
+}
+
+sub import_path_url {
+ my ($self, $x) = @_;
+ my $lei = $self->{lei};
+ # TODO auto-detect?
+ if (-f $x) {
+ open my $fh, '<', $x or return $lei->child_error(1 >> 8, <<"");
+unable to open $x: $!
+
+ _import_fh($lei, $fh, $x);
+ } else {
+ $lei->fail("$x unsupported (TODO)");
+ }
+}
+
+sub import_stdin {
+ my ($self) = @_;
+ _import_fh($self->{lei}, $self->{0}, '<stdin>');
+}
+
+1;