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| | # Copyright (C) all contributors <meta@public-inbox.org>
# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
package PublicInbox::GitAsyncCat;
use v5.12;
use parent qw(Exporter);
our @EXPORT = qw(ibx_async_cat ibx_async_prefetch async_check);
our $GCF2C; # singleton PublicInbox::Gcf2Client
sub ibx_async_cat ($$$$) {
my ($ibx, $oid, $cb, $arg) = @_;
my $isrch = $ibx->{isrch};
my $git = $isrch ? $isrch->{es}->git : ($ibx->{git} // $ibx->git);
# {topdir} means ExtSearch (likely [extindex "all"]) with potentially
# 100K alternates. git v2.33+ can handle 100k alternates fairly well.
if (!$isrch && !defined($ibx->{topdir}) && !defined($git->{-tmp}) &&
($GCF2C //= eval {
require PublicInbox::Gcf2Client;
PublicInbox::Gcf2Client::new();
} // 0)) { # 0: do not retry if libgit2 or Inline::C are missing
$GCF2C->gcf2_async("$oid $git->{git_dir}\n", $cb, $arg);
\undef;
} else { # read-only end of git-cat-file pipe
$git->cat_async($oid, $cb, $arg);
$git->watch_async;
}
}
sub async_check ($$$$) {
my ($ibx, $oidish, $cb, $arg) = @_; # $ibx may be $ctx
my $git = $ibx->{git} // $ibx->git;
$git->check_async($oidish, $cb, $arg);
($git->{ck} // $git)->watch_async;
}
# this is safe to call inside $cb, but not guaranteed to enqueue
# returns true if successful, undef if not. For fairness, we only
# prefetch if there's no in-flight requests.
sub ibx_async_prefetch {
my ($ibx, $oid, $cb, $arg) = @_;
my $git = $ibx->git;
if (!defined($ibx->{topdir}) && $GCF2C) {
if (!@{$GCF2C->gcf_inflight // []}) {
$oid .= " $git->{git_dir}\n";
return $GCF2C->gcf2_async($oid, $cb, $arg); # true
}
} elsif ($git->{epwatch}) {
return $git->async_prefetch($oid, $cb, $arg);
}
undef;
}
1;
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