# Copyright (C) 2020 all contributors
# License: AGPL-3.0+
# connects public-inbox processes to PublicInbox::Gcf2::loop()
package PublicInbox::Gcf2Client;
use strict;
use parent qw(PublicInbox::DS);
use PublicInbox::Git;
use PublicInbox::Spawn qw(popen_rd);
use IO::Handle ();
use PublicInbox::Syscall qw(EPOLLONESHOT);
# fields:
# async_cat => GitAsyncCat ref (read-only pipe)
# sock => writable pipe to Gcf2::loop
sub new {
my ($rdr) = @_;
my $self = bless {}, __PACKAGE__;
# ensure the child process has the same @INC we do:
my $env = { PERL5LIB => join(':', @INC) };
my ($out_r, $out_w);
pipe($out_r, $out_w) or die "pipe failed: $!";
$rdr //= {};
$rdr->{0} = $out_r;
my $cmd = [$^X, qw[-MPublicInbox::Gcf2 -e PublicInbox::Gcf2::loop()]];
@$self{qw(in pid)} = popen_rd($cmd, $env, $rdr);
fcntl($out_w, 1031, 4096) if $^O eq 'linux'; # 1031: F_SETPIPE_SZ
$out_w->autoflush(1);
$out_w->blocking(0);
$self->{inflight} = [];
$self->SUPER::new($out_w, EPOLLONESHOT); # detect errors once
}
sub fail {
my $self = shift;
$self->close; # PublicInbox::DS::close
PublicInbox::Git::fail($self, @_);
}
sub cat_async ($$$;$) {
my ($self, $req, $cb, $arg) = @_;
my $inflight = $self->{inflight};
# {wbuf} is rare, I hope:
cat_async_step($self, $inflight) if $self->{wbuf};
if (!$self->write(\"$req\n")) {
$self->fail("gcf2c write: $!") if !$self->{sock};
}
push @$inflight, $req, $cb, $arg;
}
# ensure PublicInbox::Git::cat_async_step never calls cat_async_retry
sub alternates_changed {}
# this is the write-only end of a pipe, DS->EventLoop will call this
sub event_step {
my ($self) = @_;
$self->flush_write;
$self->close if !$self->{in}; # process died
}
no warnings 'once';
# used by GitAsyncCat
*cat_async_step = \&PublicInbox::Git::cat_async_step;
1;