1 # Copyright (C) 2021 all contributors <meta@public-inbox.org>
2 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
4 # op dispatch socket, reads a message, runs a sub
5 # There may be multiple producers, but (for now) only one consumer
6 # Used for lei_xsearch and maybe other things
7 # "literal" => [ sub, @operands ]
8 # /regexp/ => [ sub, @operands ]
9 package PublicInbox::PktOp;
12 use parent qw(PublicInbox::DS Exporter);
13 use Errno qw(EAGAIN EINTR);
14 use PublicInbox::Syscall qw(EPOLLIN EPOLLET);
15 use Socket qw(AF_UNIX MSG_EOR SOCK_SEQPACKET);
16 use PublicInbox::IPC qw(ipc_freeze ipc_thaw);
17 our @EXPORT_OK = qw(pkt_do);
20 my ($cls, $r, $ops, $in_loop) = @_;
21 my $self = bless { sock => $r, ops => $ops, re => [] }, $cls;
22 if ($in_loop) { # iff using DS->EventLoop
24 $self->SUPER::new($r, EPOLLIN|EPOLLET);
29 # returns a blessed object as the consumer, and a GLOB/IO for the producer
31 my ($cls, $ops, $in_loop) = @_;
33 socketpair($c, $p, AF_UNIX, SOCK_SEQPACKET, 0) or die "socketpair: $!";
34 (new($cls, $c, $ops, $in_loop), $p);
37 sub pkt_do { # for the producer to trigger event_step in consumer
38 my ($producer, $cmd, @args) = @_;
39 send($producer, @args ? "$cmd\0".ipc_freeze(\@args) : $cmd, MSG_EOR);
44 my $c = $self->{sock} or return;
45 $c->blocking ? delete($self->{sock}) : $self->SUPER::close;
50 my $c = $self->{sock};
53 my $n = recv($c, $msg, 4096, 0);
55 return if $! == EAGAIN;
60 my ($cmd, $pargs) = split(/\0/, $msg, 2);
61 my $op = $self->{ops}->{$cmd // $msg};
62 die "BUG: unknown message: `$cmd'" unless $op;
63 my ($sub, @args) = @$op;
64 $sub->(@args, $pargs ? ipc_thaw($pargs) : ());
65 return $self->close if $msg eq ''; # close on EOF