+sub long_step {
+ my ($self) = @_;
+ # wbuf is unset or empty, here; {long} may add to it
+ my ($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() - $t0;
+ if ($@) {
+ err($self,
+ "%s during long response[$fd] - %0.6f",
+ $@, $elapsed);
+ }
+ out($self, " deferred[$fd] aborted - %0.6f", $elapsed);
+ $self->close;
+ } elsif ($more) { # $self->{wbuf}:
+ $self->update_idle_time;
+
+ # COMPRESS users all share the same DEFLATE context.
+ # Flush it here to ensure clients don't see
+ # each other's data
+ $self->zflush;
+
+ # no recursion, schedule another call ASAP, but only after
+ # all pending writes are done. autovivify wbuf:
+ my $new_size = push(@{$self->{wbuf}}, \&long_step);
+
+ # wbuf may be populated by $cb, no need to rearm if so:
+ $self->requeue if $new_size == 1;
+ } else { # all done!
+ delete $self->{long_cb};
+ res($self, '.');
+ my $elapsed = now() - $t0;
+ my $fd = fileno($self->{sock});
+ out($self, " deferred[$fd] done - %0.6f", $elapsed);
+ my $wbuf = $self->{wbuf}; # do NOT autovivify
+ $self->requeue unless $wbuf && @$wbuf;
+ }
+}