git: ->modified uses cat_async

While v1 inboxes are typically only a single branch, coderepos
will have many branches and being able to pipeline requests
to "git cat-file --batch" can help us mask seek times.

diff --git a/lib/PublicInbox/Git.pm b/lib/PublicInbox/Git.pm
index 2aaf1866b5965169e4abcec87f1fdaed9b6fb47c..9d0f660bae66a2afe63aef644dee08d38b660565 100644 (file)
--- a/lib/PublicInbox/Git.pm
+++ b/lib/PublicInbox/Git.pm
@@ -339,6 +339,15 @@ sub commit_title ($$) {
        ($$buf =~ /\r?\n\r?\n([^\r\n]+)\r?\n?/)[0]
 }
 
+sub extract_cmt_time {
+       my ($bref, undef, undef, undef, $modified) = @_;
+
+       if ($$bref =~ /^committer .*?> ([0-9]+) [\+\-]?[0-9]+/sm) {
+               my $cmt_time = $1 + 0;
+               $$modified = $cmt_time if $cmt_time > $$modified;
+       }
+}
+
 # returns the modified time of a git repo, same as the "modified" field
 # of a grokmirror manifest
 sub modified ($) {
@@ -346,14 +355,13 @@ sub modified ($) {
        my $modified = 0;
        my $fh = popen($self, qw(rev-parse --branches));
        defined $fh or return $modified;
+       cat_async_begin($self);
        local $/ = "\n";
        foreach my $oid (<$fh>) {
                chomp $oid;
-               my $buf = cat_file($self, $oid) or next;
-               $$buf =~ /^committer .*?> ([0-9]+) [\+\-]?[0-9]+/sm or next;
-               my $cmt_time = $1 + 0;
-               $modified = $cmt_time if $cmt_time > $modified;
+               cat_async($self, $oid, \&extract_cmt_time, \$modified);
        }
+       cat_async_wait($self);
        $modified || time;
 }