# 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 EPOLLOUT);
# fields:
# async_cat => GitAsyncCat ref (read-only pipe)
# sock => writable pipe to Gcf2::loop
sub new { bless($_[0] // {}, __PACKAGE__) }
sub gcf2c_begin ($) {
my ($self) = @_;
# 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: $!";
my $rdr = { 0 => $out_r, 2 => $self->{2} };
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);
$self->SUPER::new($out_w, 0); # EPOLL_CTL_ADD (a bit wasteful :x)
$self->{inflight} = [];
}
sub fail {
my $self = shift;
$self->close; # PublicInbox::DS::close
PublicInbox::Git::fail($self, @_);
}
sub cat_async ($$$;$) {
my ($self, $req, $cb, $arg) = @_;
my $inflight = $self->{inflight} // gcf2c_begin($self);
# rare, I hope:
cat_async_step($self, $inflight) if $self->{wbuf};
$self->write(\"$req\n") or $self->fail("gcf2c write: $!");
push @$inflight, $req, $cb, $arg;
}
# ensure PublicInbox::Git::cat_async_step never calls cat_async_retry
sub alternates_changed {}
no warnings 'once';
# this is the write-only end of a pipe, DS->EventLoop will call this
*event_step = \&PublicInbox::DS::flush_write;
# used by GitAsyncCat
*cat_async_step = \&PublicInbox::Git::cat_async_step;
1;