ds: share long_step between NNTP and IMAP

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

diff --git a/lib/PublicInbox/DS.pm b/lib/PublicInbox/DS.pm
index bf8c4466218a37a43688aaaca2b063c65e98c86e..fee31e3d132ab675ff11a9e16c9e623ddce8d1d3 100644 (file)
--- a/lib/PublicInbox/DS.pm
+++ b/lib/PublicInbox/DS.pm
@@ -347,6 +347,24 @@ retry:
     $DescriptorMap{$fd} = $self;
 }
 
+# for IMAP, NNTP, and POP3 which greet clients upon connect
+sub greet {
+       my ($self, $sock) = @_;
+       my $ev = EPOLLIN;
+       my $wbuf;
+       if ($sock->can('accept_SSL') && !$sock->accept_SSL) {
+               return CORE::close($sock) if $! != EAGAIN;
+               $ev = PublicInbox::TLS::epollbit() or return CORE::close($sock);
+               $wbuf = [ \&accept_tls_step, $self->can('do_greet')];
+       }
+       new($self, $sock, $ev | EPOLLONESHOT);
+       if ($wbuf) {
+               $self->{wbuf} = $wbuf;
+       } else {
+               $self->do_greet;
+       }
+       $self;
+}
 
 #####################################################################
 ### I N S T A N C E   M E T H O D S
@@ -630,6 +648,60 @@ sub shutdn ($) {
     }
 }
 
+sub zflush {} # overridden by NNTPdeflate and IMAPdeflate
+
+sub long_response_done {} # overridden by Net::NNTP
+
+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;
+               $@ and $self->err("%s during long response[$fd] - %0.6f",
+                                   $@, $elapsed);
+               $self->out(" deferred[$fd] aborted - %0.6f", $elapsed);
+               $self->close;
+       } elsif ($more) { # $self->{wbuf}:
+               # control passed to ibx_async_cat if $more == \undef
+               requeue_once($self) if !ref($more);
+       } else { # all done!
+               delete $self->{long_cb};
+               $self->long_response_done;
+               my $elapsed = now() - $t0;
+               my $fd = fileno($self->{sock});
+               $self->out(" deferred[$fd] done - %0.6f", $elapsed);
+               my $wbuf = $self->{wbuf}; # do NOT autovivify
+               requeue($self) unless $wbuf && @$wbuf;
+       }
+}
+
+sub requeue_once {
+       my ($self) = @_;
+       # 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.  wbuf may be populated by $cb,
+       # no need to rearm if so: (push returns new size of array)
+       requeue($self) if push(@{$self->{wbuf}}, \&long_step) == 1;
+}
+
+sub long_response ($$;@) {
+       my ($self, $cb, @args) = @_; # cb returns true if more, false if done
+       my $sock = $self->{sock} or return;
+       # make sure we disable reading during a long response,
+       # clients should not be sending us stuff and making us do more
+       # work while we are stream a response to them
+       $self->{long_cb} = [ fileno($sock), $cb, now(), @args ];
+       long_step($self); # kick off!
+       undef;
+}
+
 sub dwaitpid ($;$$) {
        my ($pid, $cb, $arg) = @_;
        if ($in_loop) {