nntp: correctly log long response errors

We cannot safely call "fileno(undef)" without bringing down the
entire -nntpd process :x.  To ensure no logging regression, we
now stash the FD for the duration of the long response to ensure
the error can be matched to the original command in logs.

Fixes: 207b89615a1a0c06 ("nntp: remove cyclic refs from long_response")

1 files changed, 3 insertions, 4 deletions

diff --git a/lib/PublicInbox/NNTP.pm b/lib/PublicInbox/NNTP.pm
index 95c9082d..9f0dfaaa 100644
--- a/lib/PublicInbox/NNTP.pm
+++ b/lib/PublicInbox/NNTP.pm
@@ -596,12 +596,11 @@ sub get_range ($$) {
 sub long_step {
         my ($self) = @_;
         # wbuf is unset or empty, here; {long} may add to it
-        my ($cb, $t0, @args) = @{$self->{long_cb}};
+        my ($fd, $cb, $t0, @args) = @{$self->{long_cb}};
         my $more = eval { $cb->($self, @args) };
         if ($@ || !$self->{sock}) { # something bad happened...
                 delete $self->{long_cb};
                 my $elapsed = now() - $t0;
-                my $fd = fileno($self->{sock});
                 if ($@) {
                         err($self,
                             "%s during long response[$fd] - %0.6f",
@@ -638,11 +637,11 @@ sub long_step {
 sub long_response ($$;@) {
         my ($self, $cb, @args) = @_; # cb returns true if more, false if done
 
-        $self->{sock} or return;
+        my $sock = $self->{sock} or return;
         # make sure we disable reading during a long response,
         # clients should not be sending us stuff and making us do more
         # work while we are stream a response to them
-        $self->{long_cb} = [ $cb, now(), @args ];
+        $self->{long_cb} = [ fileno($sock), $cb, now(), @args ];
         long_step($self); # kick off!
         undef;
 }