# Copyright (C) 2020 all contributors
# License: AGPL-3.0+
#
# internal class used by PublicInbox::Git + Danga::Socket
# This parses the output pipe of "git cat-file --batch"
#
# Note: this does NOT set the non-blocking flag, we expect `git cat-file'
# to be a local process, and git won't start writing a blob until it's
# fully read. So minimize context switching and read as much as possible
# and avoid holding a buffer in our heap any longer than it has to live.
package PublicInbox::GitAsyncCat;
use strict;
use parent qw(PublicInbox::DS Exporter);
use PublicInbox::Syscall qw(EPOLLIN EPOLLET);
our @EXPORT = qw(git_async_cat);
sub _add {
my ($class, $git) = @_;
$git->batch_prepare;
my $self = bless { git => $git }, $class;
$self->SUPER::new($git->{in}, EPOLLIN|EPOLLET);
\undef; # this is a true ref()
}
sub event_step {
my ($self) = @_;
my $git = $self->{git} or return; # ->close-ed
my $inflight = $git->{inflight};
if ($inflight && @$inflight) {
$git->cat_async_step($inflight);
$self->requeue if @$inflight || exists $git->{cat_rbuf};
}
}
sub close {
my ($self) = @_;
if (my $git = delete $self->{git}) {
delete $git->{async_cat};
}
$self->SUPER::close; # PublicInbox::DS::close
}
sub git_async_cat ($$$$) {
my ($git, $oid, $cb, $arg) = @_;
$git->cat_async($oid, $cb, $arg);
$git->{async_cat} //= _add(__PACKAGE__, $git);
}
1;