remove hard Devel::Peek dependency and lazy load for daemons

[public-inbox.git] / lib / PublicInbox / Inbox.pm

diff --git a/lib/PublicInbox/Inbox.pm b/lib/PublicInbox/Inbox.pm
index 76aeefbdd0e4b4c2c0d1d0bdc4353fd3d2e54d08..0b118b28cea84418f18a73cd5f6a63cfbbe0dae9 100644 (file)
--- a/lib/PublicInbox/Inbox.pm
+++ b/lib/PublicInbox/Inbox.pm
@@ -7,25 +7,30 @@ use strict;
 use warnings;
 use PublicInbox::Git;
 use PublicInbox::MID qw(mid2path);
-use Devel::Peek qw(SvREFCNT);
 use PublicInbox::MIME;
 
+# Long-running "git-cat-file --batch" processes won't notice
+# unlinked packs, so we need to restart those processes occasionally.
+# Xapian and SQLite file handles are mostly stable, but sometimes an
+# admin will attempt to replace them atomically after compact/vacuum
+# and we need to be prepared for that.
 my $cleanup_timer;
-eval {
-       $cleanup_timer = 'disabled';
-       require PublicInbox::EvCleanup;
-       $cleanup_timer = undef; # OK if we get here
-};
-my $cleanup_broken = $@;
-
+my $cleanup_avail = -1; # 0, or 1
+my $have_devel_peek;
 my $CLEANUP = {}; # string(inbox) -> inbox
 sub cleanup_task () {
        $cleanup_timer = undef;
        my $next = {};
        for my $ibx (values %$CLEANUP) {
                my $again;
-               foreach my $f (qw(mm search)) {
-                       delete $ibx->{$f} if SvREFCNT($ibx->{$f}) == 1;
+               if ($have_devel_peek) {
+                       foreach my $f (qw(mm search)) {
+                               # we bump refcnt by assigning tmp, here:
+                               my $tmp = $ibx->{$f} or next;
+                               next if Devel::Peek::SvREFCNT($tmp) > 2;
+                               delete $ibx->{$f};
+                               # refcnt is zero when tmp is out-of-scope
+                       }
                }
                my $expire = time - 60;
                if (my $git = $ibx->{git}) {
@@ -36,16 +41,30 @@ sub cleanup_task () {
                                $again = 1 if $git->cleanup($expire);
                        }
                }
-               $again ||= !!($ibx->{mm} || $ibx->{search});
+               if ($have_devel_peek) {
+                       $again ||= !!($ibx->{mm} || $ibx->{search});
+               }
                $next->{"$ibx"} = $ibx if $again;
        }
        $CLEANUP = $next;
 }
 
+sub cleanup_possible () {
+       # no need to require EvCleanup, here, if it were enabled another
+       # module would've require'd it, already
+       eval { PublicInbox::EvCleanup::enabled() } or return 0;
+
+       eval {
+               require Devel::Peek; # needs separate package in Fedora
+               $have_devel_peek = 1;
+       };
+       1;
+}
+
 sub _cleanup_later ($) {
        my ($self) = @_;
-       return if $cleanup_broken;
-       return unless PublicInbox::EvCleanup::enabled();
+       $cleanup_avail = cleanup_possible() if $cleanup_avail < 0;
+       return if $cleanup_avail != 1;
        $cleanup_timer ||= PublicInbox::EvCleanup::later(*cleanup_task);
        $CLEANUP->{"$self"} = $self;
 }