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 # "command" => [ $sub, @fixed_operands ]
8 package PublicInbox::PktOp;
11 use parent qw(PublicInbox::DS);
12 use Errno qw(EAGAIN ECONNRESET);
13 use PublicInbox::Syscall qw(EPOLLIN);
14 use Socket qw(AF_UNIX MSG_EOR SOCK_SEQPACKET);
15 use PublicInbox::IPC qw(ipc_freeze ipc_thaw);
16 use Scalar::Util qw(blessed);
20 my $self = bless { sock => $r }, $cls;
22 $self->SUPER::new($r, EPOLLIN);
25 # returns a blessed objects as the consumer and producer
29 socketpair($c, $p, AF_UNIX, SOCK_SEQPACKET, 0) or die "socketpair: $!";
30 (new($cls, $c), bless { op_p => $p }, $cls);
33 sub pkt_do { # for the producer to trigger event_step in consumer
34 my ($self, $cmd, @args) = @_;
35 send($self->{op_p}, @args ? "$cmd\0".ipc_freeze(\@args) : $cmd, MSG_EOR)
40 my $c = $self->{sock};
41 my $n = recv($c, my $msg, 4096, 0);
43 return if $! == EAGAIN;
44 die "recv: $!" if $! != ECONNRESET; # we may be bidirectional
47 if (index($msg, "\0") > 0) {
48 ($cmd, my $pargs) = split(/\0/, $msg, 2);
49 @pargs = @{ipc_thaw($pargs)};
51 # for compatibility with the script/lei in client mode,
52 # it doesn't load Sereal||Storable for startup speed
53 ($cmd, @pargs) = split(/ /, $msg);
55 my $op = $self->{ops}->{$cmd //= $msg};
57 my ($obj, @args) = (@$op, @pargs);
58 blessed($obj) ? $obj->$cmd(@args) : $obj->(@args);
59 } elsif ($msg ne '') {
60 die "BUG: unknown message: `$cmd'";
62 $self->close if $msg eq ''; # close on EOF