ds: move NNTP-only expiration code into DS

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

diff --git a/lib/PublicInbox/DS.pm b/lib/PublicInbox/DS.pm
index 30a9641ac6b08c3a051ec93af44300ddee959ac0..856884bbb9130e7dff9065e05619e98b385d1634 100644 (file)
--- a/lib/PublicInbox/DS.pm
+++ b/lib/PublicInbox/DS.pm
@@ -24,6 +24,7 @@ use parent qw(Exporter);
 our @EXPORT_OK = qw(now msg_more);
 use warnings;
 use 5.010_001;
+use Scalar::Util qw(blessed);
 
 use PublicInbox::Syscall qw(:epoll);
 use PublicInbox::Tmpfile;
@@ -38,9 +39,12 @@ use Errno  qw(EAGAIN EINVAL);
 use Carp   qw(croak confess carp);
 require File::Spec;
 
-my $nextq = []; # queue for next_tick
-my $WaitPids = [];               # list of [ pid, callback, callback_arg ]
-my $reap_timer;
+my $nextq; # queue for next_tick
+my $WaitPids; # list of [ pid, callback, callback_arg ]
+my $later_queue; # callbacks
+my $EXPMAP; # fd -> [ idle_time, $self ]
+our $EXPTIME = 180; # 3 minutes
+my ($later_timer, $reap_timer, $exp_timer);
 our (
      %DescriptorMap,             # fd (num) -> PublicInbox::DS object
      $Epoll,                     # Global epoll fd (or DSKQXS ref)
@@ -52,6 +56,7 @@ our (
      $LoopTimeout,               # timeout of event loop in milliseconds
      $DoneInit,                  # if we've done the one-time module init yet
      @Timers,                    # timers
+     $in_loop,
      );
 
 Reset();
@@ -67,8 +72,11 @@ Reset all state
 =cut
 sub Reset {
     %DescriptorMap = ();
+    $nextq = [];
     $WaitPids = [];
-    $reap_timer = undef;
+    $later_queue = [];
+    $EXPMAP = {};
+    $reap_timer = $later_timer = $exp_timer = undef;
     @ToClose = ();
     $LoopTimeout = -1;  # no timeout by default
     @Timers = ();
@@ -178,10 +186,12 @@ sub next_tick () {
     my $q = $nextq;
     $nextq = [];
     for (@$q) {
-        if (ref($_) eq 'CODE') {
-            $_->();
-        } else {
+        # we avoid "ref" on blessed refs to workaround a Perl 5.16.3 leak:
+        # https://rt.perl.org/Public/Bug/Display.html?id=114340
+        if (blessed($_)) {
             $_->event_step;
+        } else {
+            $_->();
         }
     }
 }
@@ -245,9 +255,11 @@ sub reap_pids {
 # reentrant SIGCHLD handler (since reap_pids is not reentrant)
 sub enqueue_reap ($) { push @$nextq, \&reap_pids };
 
+sub running () { ($SIG{CHLD} // '') eq \&enqueue_reap }
+
 sub EpollEventLoop {
-    local $SIG{CHLD} = \&enqueue_reap;
-    while (1) {
+    local $in_loop = 1;
+    do {
         my @events;
         my $i;
         my $timeout = RunTimers();
@@ -261,8 +273,8 @@ sub EpollEventLoop {
             # in that event.
             $DescriptorMap{$events[$i]->[0]}->event_step;
         }
-        return unless PostEventLoop();
-    }
+    } while (PostEventLoop());
+    _run_later();
 }
 
 =head2 C<< CLASS->SetPostLoopCallback( CODEREF ) >>
@@ -625,8 +637,7 @@ sub shutdn ($) {
 # must be called with eval, PublicInbox::DS may not be loaded (see t/qspawn.t)
 sub dwaitpid ($$$) {
     my ($pid, $cb, $arg) = @_;
-    my $chld = $SIG{CHLD};
-    if (defined($chld) && $chld eq \&enqueue_reap) {
+    if ($in_loop) {
         push @$WaitPids, [ $pid, $cb, $arg ];
 
         # We could've just missed our SIGCHLD, cover it, here:
@@ -636,6 +647,53 @@ sub dwaitpid ($$$) {
     }
 }
 
+sub _run_later () {
+    my $run = $later_queue;
+    $later_timer = undef;
+    $later_queue = [];
+    $_->() for @$run;
+}
+
+sub later ($) {
+    my ($cb) = @_;
+    push @$later_queue, $cb;
+    $later_timer //= AddTimer(undef, 60, \&_run_later);
+}
+
+sub expire_old () {
+    my $now = now();
+    my $exp = $EXPTIME;
+    my $old = $now - $exp;
+    my %new;
+    while (my ($fd, $v) = each %$EXPMAP) {
+        my ($idle_time, $ds_obj) = @$v;
+        if ($idle_time < $old) {
+            if (!$ds_obj->shutdn) {
+                $new{$fd} = $v;
+            }
+        } else {
+            $new{$fd} = $v;
+        }
+    }
+    $EXPMAP = \%new;
+    $exp_timer = scalar(keys %new) ? later(\&expire_old) : undef;
+}
+
+sub update_idle_time {
+    my ($self) = @_;
+    my $sock = $self->{sock} or return;
+    $EXPMAP->{fileno($sock)} = [ now(), $self ];
+    $exp_timer //= later(\&expire_old);
+}
+
+sub not_idle_long {
+    my ($self, $now) = @_;
+    my $sock = $self->{sock} or return;
+    my $ary = $EXPMAP->{fileno($sock)} or return;
+    my $exp_at = $ary->[0] + $EXPTIME;
+    $exp_at > $now;
+}
+
 package PublicInbox::DS::Timer;
 # [$abs_float_firetime, $coderef];
 sub cancel {