1 # This library is free software; you can redistribute it and/or modify
2 # it under the same terms as Perl itself.
4 # This license differs from the rest of public-inbox
6 # This is a fork of the (for now) unmaintained Danga::Socket 1.61.
7 # Unused features will be removed, and updates will be made to take
8 # advantage of newer kernels.
10 # API changes to diverge from Danga::Socket will happen to better
11 # accomodate new features and improve scalability. Do not expect
12 # this to be a stable API like Danga::Socket.
13 # Bugs encountered (and likely fixed) are reported to
14 # bug-Danga-Socket@rt.cpan.org and visible at:
15 # https://rt.cpan.org/Public/Dist/Display.html?Name=Danga-Socket
16 package PublicInbox::DS;
22 use Fcntl qw(FD_CLOEXEC F_SETFD F_GETFD);
26 use PublicInbox::Syscall qw(:epoll);
28 use fields ('sock', # underlying socket
29 'fd', # numeric file descriptor
30 'write_buf', # arrayref of scalars, scalarrefs, or coderefs to write
31 'write_buf_offset', # offset into first array of write_buf to start writing at
32 'write_buf_size', # total length of data in all write_buf items
33 'write_set_watch', # bool: true if we internally set watch_write rather than by a subclass
34 'closed', # bool: socket is closed
35 'event_watch', # bitmask of events the client is interested in (POLLIN,OUT,etc.)
36 'writer_func', # subref which does writing. must return bytes written (or undef) and set $! on errors
39 use Errno qw(EINPROGRESS EWOULDBLOCK EISCONN ENOTSOCK
40 EPIPE EAGAIN EBADF ECONNRESET ENOPROTOOPT);
41 use Carp qw(croak confess);
43 use constant DebugLevel => 0;
45 use constant POLLIN => 1;
46 use constant POLLOUT => 4;
47 use constant POLLERR => 8;
48 use constant POLLHUP => 16;
49 use constant POLLNVAL => 32;
51 our $HAVE_KQUEUE = eval { require IO::KQueue; 1 };
54 $HaveEpoll, # Flag -- is epoll available? initially undefined.
56 %DescriptorMap, # fd (num) -> PublicInbox::DS object
57 $Epoll, # Global epoll fd (for epoll mode only)
58 $KQueue, # Global kqueue fd ref (for kqueue mode only)
59 $_io, # IO::Handle for Epoll
60 @ToClose, # sockets to close when event loop is done
62 $PostLoopCallback, # subref to call at the end of each loop, if defined (global)
63 %PLCMap, # fd (num) -> PostLoopCallback (per-object)
65 $LoopTimeout, # timeout of event loop in milliseconds
66 $DoneInit, # if we've done the one-time module init yet
70 # this may be set to zero with old kernels
71 our $EPOLLEXCLUSIVE = EPOLLEXCLUSIVE;
74 #####################################################################
75 ### C L A S S M E T H O D S
76 #####################################################################
78 =head2 C<< CLASS->Reset() >>
86 $LoopTimeout = -1; # no timeout by default
89 $PostLoopCallback = undef;
93 # NOTE kqueue is close-on-fork, and we don't account for it, yet
94 # OTOH, we (public-inbox) don't need this sub outside of tests...
95 POSIX::close($$KQueue) if !$_io && $KQueue && $$KQueue >= 0;
98 $_io = undef; # close $Epoll
101 *EventLoop = *FirstTimeEventLoop;
104 =head2 C<< CLASS->SetLoopTimeout( $timeout ) >>
106 Set the loop timeout for the event loop to some value in milliseconds.
108 A timeout of 0 (zero) means poll forever. A timeout of -1 means poll and return
113 return $LoopTimeout = $_[1] + 0;
116 =head2 C<< CLASS->DebugMsg( $format, @args ) >>
118 Print the debugging message specified by the C<sprintf>-style I<format> and
123 my ( $class, $fmt, @args ) = @_;
125 printf STDERR ">>> $fmt\n", @args;
128 =head2 C<< CLASS->AddTimer( $seconds, $coderef ) >>
130 Add a timer to occur $seconds from now. $seconds may be fractional, but timers
131 are not guaranteed to fire at the exact time you ask for.
133 Returns a timer object which you can call C<< $timer->cancel >> on if you need to.
138 my ($secs, $coderef) = @_;
140 my $fire_time = Time::HiRes::time() + $secs;
142 my $timer = bless [$fire_time, $coderef], "PublicInbox::DS::Timer";
144 if (!@Timers || $fire_time >= $Timers[-1][0]) {
145 push @Timers, $timer;
149 # Now, where do we insert? (NOTE: this appears slow, algorithm-wise,
150 # but it was compared against calendar queues, heaps, naive push/sort,
151 # and a bunch of other versions, and found to be fastest with a large
152 # variety of datasets.)
153 for (my $i = 0; $i < @Timers; $i++) {
154 if ($Timers[$i][0] > $fire_time) {
155 splice(@Timers, $i, 0, $timer);
160 die "Shouldn't get here.";
163 # keeping this around in case we support other FD types for now,
164 # epoll_create1(EPOLL_CLOEXEC) requires Linux 2.6.27+...
165 sub set_cloexec ($) {
168 $_io = IO::Handle->new_from_fd($fd, 'r+') or return;
169 defined(my $fl = fcntl($_io, F_GETFD, 0)) or return;
170 fcntl($_io, F_SETFD, $fl | FD_CLOEXEC);
179 $KQueue = IO::KQueue->new();
180 $HaveKQueue = defined $KQueue;
182 *EventLoop = *KQueueEventLoop;
185 elsif (PublicInbox::Syscall::epoll_defined()) {
186 $Epoll = eval { epoll_create(1024); };
187 $HaveEpoll = defined $Epoll && $Epoll >= 0;
190 *EventLoop = *EpollEventLoop;
194 if (!$HaveEpoll && !$HaveKQueue) {
196 *EventLoop = *PollEventLoop;
200 =head2 C<< CLASS->EventLoop() >>
202 Start processing IO events. In most daemon programs this never exits. See
203 C<PostLoopCallback> below for how to exit the loop.
206 sub FirstTimeEventLoop {
212 EpollEventLoop($class);
213 } elsif ($HaveKQueue) {
214 KQueueEventLoop($class);
216 PollEventLoop($class);
220 # runs timers and returns milliseconds for next one, or next event loop
222 return $LoopTimeout unless @Timers;
224 my $now = Time::HiRes::time();
227 while (@Timers && $Timers[0][0] <= $now) {
228 my $to_run = shift(@Timers);
229 $to_run->[1]->($now) if $to_run->[1];
232 return $LoopTimeout unless @Timers;
234 # convert time to an even number of milliseconds, adding 1
235 # extra, otherwise floating point fun can occur and we'll
236 # call RunTimers like 20-30 times, each returning a timeout
237 # of 0.0000212 seconds
238 my $timeout = int(($Timers[0][0] - $now) * 1000) + 1;
240 # -1 is an infinite timeout, so prefer a real timeout
241 return $timeout if $LoopTimeout == -1;
243 # otherwise pick the lower of our regular timeout and time until
245 return $LoopTimeout if $LoopTimeout < $timeout;
249 ### The epoll-based event loop. Gets installed as EventLoop if IO::Epoll loads
257 my $timeout = RunTimers();
259 # get up to 1000 events
260 my $evcount = epoll_wait($Epoll, 1000, $timeout, \@events);
262 for ($i=0; $i<$evcount; $i++) {
263 my $ev = $events[$i];
265 # it's possible epoll_wait returned many events, including some at the end
266 # that ones in the front triggered unregister-interest actions. if we
267 # can't find the %sock entry, it's because we're no longer interested
269 my PublicInbox::DS $pob = $DescriptorMap{$ev->[0]};
271 my $state = $ev->[1];
273 # if we didn't find a Perlbal::Socket subclass for that fd, try other
274 # pseudo-registered (above) fds.
277 warn "epoll() returned fd $fd w/ state $state for which we have no mapping. removing.\n";
278 epoll_ctl($Epoll, EPOLL_CTL_DEL, $fd, 0);
283 DebugLevel >= 1 && $class->DebugMsg("Event: fd=%d (%s), state=%d \@ %s\n",
284 $ev->[0], ref($pob), $ev->[1], time);
286 # standard non-profiling codepat
287 $pob->event_read if $state & EPOLLIN && ! $pob->{closed};
288 $pob->event_write if $state & EPOLLOUT && ! $pob->{closed};
289 if ($state & (EPOLLERR|EPOLLHUP)) {
290 $pob->event_err if $state & EPOLLERR && ! $pob->{closed};
291 $pob->event_hup if $state & EPOLLHUP && ! $pob->{closed};
294 return unless PostEventLoop();
299 ### The fallback IO::Poll-based event loop. Gets installed as EventLoop if
300 ### IO::Epoll fails to load.
304 my PublicInbox::DS $pob;
307 my $timeout = RunTimers();
309 # the following sets up @poll as a series of ($poll,$event_mask)
310 # items, then uses IO::Poll::_poll, implemented in XS, which
311 # modifies the array in place with the even elements being
312 # replaced with the event masks that occured.
314 while ( my ($fd, $sock) = each %DescriptorMap ) {
315 push @poll, $fd, $sock->{event_watch};
318 # if nothing to poll, either end immediately (if no timeout)
319 # or just keep calling the callback
321 select undef, undef, undef, ($timeout / 1000);
322 return unless PostEventLoop();
326 my $count = IO::Poll::_poll($timeout, @poll);
327 unless ($count >= 0) {
328 return unless PostEventLoop();
332 # Fetch handles with read events
334 my ($fd, $state) = splice(@poll, 0, 2);
337 $pob = $DescriptorMap{$fd};
343 $pob->event_read if $state & POLLIN && ! $pob->{closed};
344 $pob->event_write if $state & POLLOUT && ! $pob->{closed};
345 $pob->event_err if $state & POLLERR && ! $pob->{closed};
346 $pob->event_hup if $state & POLLHUP && ! $pob->{closed};
349 return unless PostEventLoop();
355 ### The kqueue-based event loop. Gets installed as EventLoop if IO::KQueue works
357 sub KQueueEventLoop {
361 my $timeout = RunTimers();
362 my @ret = eval { $KQueue->kevent($timeout) };
364 # workaround https://rt.cpan.org/Ticket/Display.html?id=116615
365 if ($err =~ /Interrupted system call/) {
372 foreach my $kev (@ret) {
373 my ($fd, $filter, $flags, $fflags) = @$kev;
374 my PublicInbox::DS $pob = $DescriptorMap{$fd};
376 warn "kevent() returned fd $fd for which we have no mapping. removing.\n";
377 POSIX::close($fd); # close deletes the kevent entry
381 DebugLevel >= 1 && $class->DebugMsg("Event: fd=%d (%s), flags=%d \@ %s\n",
382 $fd, ref($pob), $flags, time);
384 $pob->event_read if $filter == IO::KQueue::EVFILT_READ() && !$pob->{closed};
385 $pob->event_write if $filter == IO::KQueue::EVFILT_WRITE() && !$pob->{closed};
386 if ($flags == IO::KQueue::EV_EOF() && !$pob->{closed}) {
394 return unless PostEventLoop();
400 =head2 C<< CLASS->SetPostLoopCallback( CODEREF ) >>
402 Sets post loop callback function. Pass a subref and it will be
403 called every time the event loop finishes.
405 Return 1 (or any true value) from the sub to make the loop continue, 0 or false
408 The callback function will be passed two parameters: \%DescriptorMap
411 sub SetPostLoopCallback {
412 my ($class, $ref) = @_;
415 # per-object callback
416 my PublicInbox::DS $self = $class;
417 if (defined $ref && ref $ref eq 'CODE') {
418 $PLCMap{$self->{fd}} = $ref;
420 delete $PLCMap{$self->{fd}};
424 $PostLoopCallback = (defined $ref && ref $ref eq 'CODE') ? $ref : undef;
428 # Internal function: run the post-event callback, send read events
429 # for pushed-back data, and close pending connections. returns 1
430 # if event loop should continue, or 0 to shut it all down.
432 # now we can close sockets that wanted to close during our event processing.
433 # (we didn't want to close them during the loop, as we didn't want fd numbers
434 # being reused and confused during the event loop)
435 while (my $sock = shift @ToClose) {
436 my $fd = fileno($sock);
438 # close the socket. (not a PublicInbox::DS close)
441 # and now we can finally remove the fd from the map. see
442 # comment above in _cleanup.
443 delete $DescriptorMap{$fd};
447 # by default we keep running, unless a postloop callback (either per-object
448 # or global) cancels it
449 my $keep_running = 1;
451 # per-object post-loop-callbacks
452 for my $plc (values %PLCMap) {
453 $keep_running &&= $plc->(\%DescriptorMap);
456 # now we're at the very end, call callback if defined
457 if (defined $PostLoopCallback) {
458 $keep_running &&= $PostLoopCallback->(\%DescriptorMap);
461 return $keep_running;
464 #####################################################################
465 ### PublicInbox::DS-the-object code
466 #####################################################################
468 =head2 OBJECT METHODS
470 =head2 C<< CLASS->new( $socket ) >>
472 Create a new PublicInbox::DS subclass object for the given I<socket> which will
473 react to events on it during the C<EventLoop>.
475 This is normally (always?) called from your subclass via:
477 $class->SUPER::new($socket);
481 my ($self, $sock, $exclusive) = @_;
482 $self = fields::new($self) unless ref $self;
484 $self->{sock} = $sock;
485 my $fd = fileno($sock);
487 Carp::cluck("undef sock and/or fd in PublicInbox::DS->new. sock=" . ($sock || "") . ", fd=" . ($fd || ""))
491 $self->{write_buf} = [];
492 $self->{write_buf_offset} = 0;
493 $self->{write_buf_size} = 0;
496 my $ev = $self->{event_watch} = POLLERR|POLLHUP|POLLNVAL;
502 $ev = $self->{event_watch} = EPOLLIN|EPOLLERR|EPOLLHUP|$EPOLLEXCLUSIVE;
505 if (epoll_ctl($Epoll, EPOLL_CTL_ADD, $fd, $ev)) {
506 if ($!{EINVAL} && ($ev & $EPOLLEXCLUSIVE)) {
507 $EPOLLEXCLUSIVE = 0; # old kernel
508 $ev = $self->{event_watch} = EPOLLIN|EPOLLERR|EPOLLHUP;
511 die "couldn't add epoll watch for $fd: $!\n";
514 elsif ($HaveKQueue) {
515 # Add them to the queue but disabled for now
516 $KQueue->EV_SET($fd, IO::KQueue::EVFILT_READ(),
517 IO::KQueue::EV_ADD() | IO::KQueue::EV_DISABLE());
518 $KQueue->EV_SET($fd, IO::KQueue::EVFILT_WRITE(),
519 IO::KQueue::EV_ADD() | IO::KQueue::EV_DISABLE());
522 Carp::cluck("PublicInbox::DS::new blowing away existing descriptor map for fd=$fd ($DescriptorMap{$fd})")
523 if $DescriptorMap{$fd};
525 $DescriptorMap{$fd} = $self;
530 #####################################################################
531 ### I N S T A N C E M E T H O D S
532 #####################################################################
534 =head2 C<< $obj->steal_socket() >>
536 Basically returns our socket and makes it so that we don't try to close it,
537 but we do remove it from epoll handlers. THIS CLOSES $self. It is the same
538 thing as calling close, except it gives you the socket to use.
542 my PublicInbox::DS $self = $_[0];
543 return if $self->{closed};
545 # cleanup does most of the work of closing this socket
548 # now undef our internal sock and fd structures so we don't use them
549 my $sock = $self->{sock};
550 $self->{sock} = undef;
554 =head2 C<< $obj->close( [$reason] ) >>
556 Close the socket. The I<reason> argument will be used in debugging messages.
560 my PublicInbox::DS $self = $_[0];
561 return if $self->{closed};
563 # print out debugging info for this close
565 my ($pkg, $filename, $line) = caller;
566 my $reason = $_[1] || "";
567 warn "Closing \#$self->{fd} due to $pkg/$filename/$line ($reason)\n";
570 # this does most of the work of closing us
573 # defer closing the actual socket until the event loop is done
574 # processing this round of events. (otherwise we might reuse fds)
576 push @ToClose, $self->{sock};
577 $self->{sock} = undef;
583 ### METHOD: _cleanup()
584 ### Called by our closers so we can clean internal data structures.
586 my PublicInbox::DS $self = $_[0];
588 # we're effectively closed; we have no fd and sock when we leave here
591 # we need to flush our write buffer, as there may
592 # be self-referential closures (sub { $client->close })
593 # preventing the object from being destroyed
594 $self->{write_buf} = [];
596 # if we're using epoll, we have to remove this from our epoll fd so we stop getting
597 # notifications about it
598 if ($HaveEpoll && $self->{fd}) {
599 if (epoll_ctl($Epoll, EPOLL_CTL_DEL, $self->{fd}, $self->{event_watch}) != 0) {
600 # dump_error prints a backtrace so we can try to figure out why this happened
601 $self->dump_error("epoll_ctl(): failure deleting fd=$self->{fd} during _cleanup(); $! (" . ($!+0) . ")");
605 # now delete from mappings. this fd no longer belongs to us, so we don't want
606 # to get alerts for it if it becomes writable/readable/etc.
607 delete $PLCMap{$self->{fd}};
609 # we explicitly don't delete from DescriptorMap here until we
610 # actually close the socket, as we might be in the middle of
611 # processing an epoll_wait/etc that returned hundreds of fds, one
612 # of which is not yet processed and is what we're closing. if we
613 # keep it in DescriptorMap, then the event harnesses can just
614 # looked at $pob->{closed} and ignore it. but if it's an
615 # un-accounted for fd, then it (understandably) freak out a bit
616 # and emit warnings, thinking their state got off.
618 # and finally get rid of our fd so we can't use it anywhere else
622 =head2 C<< $obj->sock() >>
624 Returns the underlying IO::Handle for the object.
628 my PublicInbox::DS $self = shift;
629 return $self->{sock};
632 =head2 C<< $obj->set_writer_func( CODEREF ) >>
634 Sets a function to use instead of C<syswrite()> when writing data to the socket.
637 sub set_writer_func {
638 my PublicInbox::DS $self = shift;
640 Carp::croak("Not a subref") unless !defined $wtr || UNIVERSAL::isa($wtr, "CODE");
641 $self->{writer_func} = $wtr;
644 =head2 C<< $obj->write( $data ) >>
646 Write the specified data to the underlying handle. I<data> may be scalar,
647 scalar ref, code ref (to run when there), or undef just to kick-start.
648 Returns 1 if writes all went through, or 0 if there are writes in queue. If
649 it returns 1, caller should stop waiting for 'writable' events)
653 my PublicInbox::DS $self;
657 # nobody should be writing to closed sockets, but caller code can
658 # do two writes within an event, have the first fail and
659 # disconnect the other side (whose destructor then closes the
660 # calling object, but it's still in a method), and then the
661 # now-dead object does its second write. that is this case. we
662 # just lie and say it worked. it'll be dead soon and won't be
664 return 1 if $self->{closed};
668 # just queue data if there's already a wait
672 $bref = ref $data ? $data : \$data;
673 if ($self->{write_buf_size}) {
674 push @{$self->{write_buf}}, $bref;
675 $self->{write_buf_size} += ref $bref eq "SCALAR" ? length($$bref) : 1;
679 # this flag says we're bypassing the queue system, knowing we're the
680 # only outstanding write, and hoping we don't ever need to use it.
681 # if so later, though, we'll need to queue
687 return 1 unless $bref ||= $self->{write_buf}[0];
691 $len = length($$bref); # this will die if $bref is a code ref, caught below
694 if (UNIVERSAL::isa($bref, "CODE")) {
695 unless ($need_queue) {
696 $self->{write_buf_size}--; # code refs are worth 1
697 shift @{$self->{write_buf}};
701 # code refs are just run and never get reenqueued
702 # (they're one-shot), so turn off the flag indicating the
703 # outstanding data needs queueing.
709 die "Write error: $@ <$bref>";
712 my $to_write = $len - $self->{write_buf_offset};
714 if (my $wtr = $self->{writer_func}) {
715 $written = $wtr->($bref, $to_write, $self->{write_buf_offset});
717 $written = syswrite($self->{sock}, $$bref, $to_write, $self->{write_buf_offset});
720 if (! defined $written) {
722 return $self->close("EPIPE");
723 } elsif ($! == EAGAIN) {
724 # since connection has stuff to write, it should now be
725 # interested in pending writes:
727 push @{$self->{write_buf}}, $bref;
728 $self->{write_buf_size} += $len;
730 $self->{write_set_watch} = 1 unless $self->{event_watch} & POLLOUT;
731 $self->watch_write(1);
733 } elsif ($! == ECONNRESET) {
734 return $self->close("ECONNRESET");
737 DebugLevel >= 1 && $self->debugmsg("Closing connection ($self) due to write error: $!\n");
739 return $self->close("write_error");
740 } elsif ($written != $to_write) {
741 DebugLevel >= 2 && $self->debugmsg("Wrote PARTIAL %d bytes to %d",
742 $written, $self->{fd});
744 push @{$self->{write_buf}}, $bref;
745 $self->{write_buf_size} += $len;
747 # since connection has stuff to write, it should now be
748 # interested in pending writes:
749 $self->{write_buf_offset} += $written;
750 $self->{write_buf_size} -= $written;
751 $self->on_incomplete_write;
753 } elsif ($written == $to_write) {
754 DebugLevel >= 2 && $self->debugmsg("Wrote ALL %d bytes to %d (nq=%d)",
755 $written, $self->{fd}, $need_queue);
756 $self->{write_buf_offset} = 0;
758 if ($self->{write_set_watch}) {
759 $self->watch_write(0);
760 $self->{write_set_watch} = 0;
763 # this was our only write, so we can return immediately
764 # since we avoided incrementing the buffer size or
765 # putting it in the buffer. we also know there
766 # can't be anything else to write.
767 return 1 if $need_queue;
769 $self->{write_buf_size} -= $written;
770 shift @{$self->{write_buf}};
777 sub on_incomplete_write {
778 my PublicInbox::DS $self = shift;
779 $self->{write_set_watch} = 1 unless $self->{event_watch} & POLLOUT;
780 $self->watch_write(1);
783 =head2 C<< $obj->read( $bytecount ) >>
785 Read at most I<bytecount> bytes from the underlying handle; returns scalar
786 ref on read, or undef on connection closed.
790 my PublicInbox::DS $self = shift;
791 return if $self->{closed};
794 my $sock = $self->{sock};
796 # if this is too high, perl quits(!!). reports on mailing lists
797 # don't seem to point to a universal answer. 5MB worked for some,
798 # crashed for others. 1MB works for more people. let's go with 1MB
800 my $req_bytes = $bytes > 1048576 ? 1048576 : $bytes;
802 my $res = sysread($sock, $buf, $req_bytes, 0);
803 DebugLevel >= 2 && $self->debugmsg("sysread = %d; \$! = %d", $res, $!);
805 if (! $res && $! != EWOULDBLOCK) {
806 # catches 0=conn closed or undef=error
807 DebugLevel >= 2 && $self->debugmsg("Fd \#%d read hit the end of the road.", $self->{fd});
814 =head2 (VIRTUAL) C<< $obj->event_read() >>
816 Readable event handler. Concrete deriviatives of PublicInbox::DS should
817 provide an implementation of this. The default implementation will die if
821 sub event_read { die "Base class event_read called for $_[0]\n"; }
823 =head2 (VIRTUAL) C<< $obj->event_err() >>
825 Error event handler. Concrete deriviatives of PublicInbox::DS should
826 provide an implementation of this. The default implementation will die if
830 sub event_err { die "Base class event_err called for $_[0]\n"; }
832 =head2 (VIRTUAL) C<< $obj->event_hup() >>
834 'Hangup' event handler. Concrete deriviatives of PublicInbox::DS should
835 provide an implementation of this. The default implementation will die if
839 sub event_hup { die "Base class event_hup called for $_[0]\n"; }
841 =head2 C<< $obj->event_write() >>
843 Writable event handler. Concrete deriviatives of PublicInbox::DS may wish to
844 provide an implementation of this. The default implementation calls
845 C<write()> with an C<undef>.
853 =head2 C<< $obj->watch_read( $boolean ) >>
855 Turn 'readable' event notification on or off.
859 my PublicInbox::DS $self = shift;
860 return if $self->{closed} || !$self->{sock};
863 my $event = $self->{event_watch};
865 $event &= ~POLLIN if ! $val;
866 $event |= POLLIN if $val;
868 # If it changed, set it
869 if ($event != $self->{event_watch}) {
871 $KQueue->EV_SET($self->{fd}, IO::KQueue::EVFILT_READ(),
872 $val ? IO::KQueue::EV_ENABLE() : IO::KQueue::EV_DISABLE());
875 epoll_ctl($Epoll, EPOLL_CTL_MOD, $self->{fd}, $event)
876 and $self->dump_error("couldn't modify epoll settings for $self->{fd} " .
877 "from $self->{event_watch} -> $event: $! (" . ($!+0) . ")");
879 $self->{event_watch} = $event;
883 =head2 C<< $obj->watch_write( $boolean ) >>
885 Turn 'writable' event notification on or off.
889 my PublicInbox::DS $self = shift;
890 return if $self->{closed} || !$self->{sock};
893 my $event = $self->{event_watch};
895 $event &= ~POLLOUT if ! $val;
896 $event |= POLLOUT if $val;
898 if ($val && caller ne __PACKAGE__) {
899 # A subclass registered interest, it's now responsible for this.
900 $self->{write_set_watch} = 0;
903 # If it changed, set it
904 if ($event != $self->{event_watch}) {
906 $KQueue->EV_SET($self->{fd}, IO::KQueue::EVFILT_WRITE(),
907 $val ? IO::KQueue::EV_ENABLE() : IO::KQueue::EV_DISABLE());
910 epoll_ctl($Epoll, EPOLL_CTL_MOD, $self->{fd}, $event)
911 and $self->dump_error("couldn't modify epoll settings for $self->{fd} " .
912 "from $self->{event_watch} -> $event: $! (" . ($!+0) . ")");
914 $self->{event_watch} = $event;
918 =head2 C<< $obj->dump_error( $message ) >>
920 Prints to STDERR a backtrace with information about this socket and what lead
921 up to the dump_error call.
927 while (my ($file, $line, $sub) = (caller($i++))[1..3]) {
928 push @list, "\t$file:$line called $sub\n";
931 warn "ERROR: $_[1]\n" .
932 "\t$_[0] = " . $_[0]->as_string . "\n" .
936 =head2 C<< $obj->debugmsg( $format, @args ) >>
938 Print the debugging message specified by the C<sprintf>-style I<format> and
943 my ( $self, $fmt, @args ) = @_;
944 confess "Not an object" unless ref $self;
947 printf STDERR ">>> $fmt\n", @args;
950 =head2 C<< $obj->as_string() >>
952 Returns a string describing this socket.
956 my PublicInbox::DS $self = shift;
957 my $rw = "(" . ($self->{event_watch} & POLLIN ? 'R' : '') .
958 ($self->{event_watch} & POLLOUT ? 'W' : '') . ")";
959 my $ret = ref($self) . "$rw: " . ($self->{closed} ? "closed" : "open");
963 package PublicInbox::DS::Timer;
964 # [$abs_float_firetime, $coderef];
971 =head1 AUTHORS (Danga::Socket)
973 Brad Fitzpatrick <brad@danga.com> - author
975 Michael Granger <ged@danga.com> - docs, testing
977 Mark Smith <junior@danga.com> - contributor, heavy user, testing
979 Matt Sergeant <matt@sergeant.org> - kqueue support, docs, timers, other bits