[PATCH] www_stream: use DESTROY to cleanup temporary gits

[Eric Wong]

Relying on a timer to handle cleanup in f9ac22a4b485 was
sub-optimal since the delay could prove expensive under heavy
traffic.  So rely on ->DESTROY instead since we we no longer
hold reference cycles by the time the show_blob callback
executes.

Fixes: f9ac22a4b485 ("git_async_cat: automatically cleanup temporary gits")
---
 lib/PublicInbox/GitAsyncCat.pm | 8 --------
 lib/PublicInbox/ViewVCS.pm     | 1 +
 lib/PublicInbox/WwwStream.pm   | 5 +++++
 3 files changed, 6 insertions(+), 8 deletions(-)

diff --git a/lib/PublicInbox/GitAsyncCat.pm b/lib/PublicInbox/GitAsyncCat.pm
index 2d601542..b32c2fd3 100644
--- a/lib/PublicInbox/GitAsyncCat.pm
+++ b/lib/PublicInbox/GitAsyncCat.pm
@@ -45,12 +45,6 @@ sub event_step {
        }
 }
 
-sub git_tmp_cleanup {
-       my ($git) = @_;
-       $git->cleanup(1) and
-               PublicInbox::DS::add_timer(3, \&git_tmp_cleanup, $git);
-}
-
 sub ibx_async_cat ($$$$) {
        my ($ibx, $oid, $cb, $arg) = @_;
        my $git = $ibx->{git} // $ibx->git;
@@ -69,8 +63,6 @@ sub ibx_async_cat ($$$$) {
                $git->{async_cat} //= do {
                        my $self = bless { git => $git }, __PACKAGE__;
                        $git->{in}->blocking(0);
-                       $git->{-tmp} and PublicInbox::DS::add_uniq_timer(
-                                               3, \&git_tmp_cleanup, $git);
                        $self->SUPER::new($git->{in}, EPOLLIN|EPOLLET);
                        \undef; # this is a true ref()
                };
diff --git a/lib/PublicInbox/ViewVCS.pm b/lib/PublicInbox/ViewVCS.pm
index 915cf2c5..b0f58455 100644
--- a/lib/PublicInbox/ViewVCS.pm
+++ b/lib/PublicInbox/ViewVCS.pm
@@ -414,6 +414,7 @@ blob $oid $size bytes $raw_link</pre>
 EOM
        }
        @{$ctx->{-paths}} = ($path, $raw_link);
+       bless $ctx, 'PublicInbox::WwwStream'; # for DESTROY
        $ctx->{git} = $git;
        if ($ctx->{env}->{'pi-httpd.async'}) {
                ibx_async_cat($ctx, $oid, \&show_blob, $ctx);
diff --git a/lib/PublicInbox/WwwStream.pm b/lib/PublicInbox/WwwStream.pm
index 77b6f9c2..16442d51 100644
--- a/lib/PublicInbox/WwwStream.pm
+++ b/lib/PublicInbox/WwwStream.pm
@@ -220,4 +220,9 @@ sub html_init {
        print { $ctx->zfh } html_top($ctx);
 }
 
+sub DESTROY {
+       my ($ctx) = @_;
+       $ctx->{git}->cleanup if $ctx->{git} && $ctx->{git}->{-tmp};
+}
+
 1;