# Copyright (C) 2020 all contributors
# License: AGPL-3.0+
#
# internal class used by PublicInbox::Git + PublicInbox::DS
# 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 event_step {
my ($self) = @_;
my $gitish = $self->{gitish};
return $self->close if ($gitish->{in} // 0) != ($self->{sock} // 1);
my $inflight = $gitish->{inflight};
if ($inflight && @$inflight) {
$gitish->cat_async_step($inflight);
$self->requeue if @$inflight || exists $gitish->{cat_rbuf};
}
}
sub git_async_cat ($$$$) {
my ($git, $oid, $cb, $arg) = @_;
my $gitish = $git->{gcf2c}; # PublicInbox::Gcf2Client
if ($gitish) {
$oid .= " $git->{git_dir}";
} else {
$gitish = $git;
}
$gitish->cat_async($oid, $cb, $arg);
$gitish->{async_cat} //= do {
my $self = bless { gitish => $gitish }, __PACKAGE__;
$self->SUPER::new($gitish->{in}, EPOLLIN|EPOLLET);
\undef; # this is a true ref()
};
}
1;