#
# This license differs from the rest of public-inbox
#
-# This is a fork of the (for now) unmaintained Danga::Socket 1.61.
-# Unused features will be removed, and updates will be made to take
-# advantage of newer kernels.
+# This is a fork of the unmaintained Danga::Socket (1.61) with
+# significant changes. See Documentation/technical/ds.txt in our
+# source for details.
#
-# API changes to diverge from Danga::Socket will happen to better
-# accomodate new features and improve scalability. Do not expect
-# this to be a stable API like Danga::Socket.
-# Bugs encountered (and likely fixed) are reported to
-# bug-Danga-Socket@rt.cpan.org and visible at:
+# Do not expect this to be a stable API like Danga::Socket,
+# but it will evolve to suite our needs and to take advantage of
+# newer Linux and *BSD features.
+# Bugs encountered were reported to bug-Danga-Socket@rt.cpan.org,
+# fixed in Danga::Socket 1.62 and visible at:
# https://rt.cpan.org/Public/Dist/Display.html?Name=Danga-Socket
+#
+# fields:
+# sock: underlying socket
+# rbuf: scalarref, usually undef
+# wbuf: arrayref of coderefs or tmpio (autovivified))
+# (tmpio = [ GLOB, offset, [ length ] ])
package PublicInbox::DS;
use strict;
-use bytes;
-use POSIX ();
-use IO::Handle qw();
-use Fcntl qw(FD_CLOEXEC F_SETFD F_GETFD SEEK_SET);
-use Time::HiRes qw(clock_gettime CLOCK_MONOTONIC);
+use v5.10.1;
use parent qw(Exporter);
-our @EXPORT_OK = qw(now msg_more write_in_full);
-use warnings;
-use 5.010_001;
-
+use bytes qw(length substr); # FIXME(?): needed for PublicInbox::NNTP
+use POSIX qw(WNOHANG sigprocmask SIG_SETMASK);
+use Fcntl qw(SEEK_SET :DEFAULT O_APPEND);
+use Time::HiRes qw(clock_gettime CLOCK_MONOTONIC);
+use Scalar::Util qw(blessed);
use PublicInbox::Syscall qw(:epoll);
-
-use fields ('sock', # underlying socket
- 'wbuf', # arrayref of coderefs or GLOB refs
- 'wbuf_off', # offset into first element of wbuf to start writing at
- );
-
-use Errno qw(EAGAIN EINVAL);
-use Carp qw(croak confess);
-use File::Temp qw(tempfile);
-
-our $HAVE_KQUEUE = eval { require IO::KQueue; IO::KQueue->import; 1 };
-
+use PublicInbox::Tmpfile;
+use Errno qw(EAGAIN EINVAL);
+use Carp qw(carp croak);
+our @EXPORT_OK = qw(now msg_more dwaitpid add_timer add_uniq_timer);
+
+my %Stack;
+my $nextq; # queue for next_tick
+my $wait_pids; # list of [ pid, callback, callback_arg ]
+my $later_q; # list of callbacks to run at some later interval
+my $EXPMAP; # fd -> idle_time
+our $EXPTIME = 180; # 3 minutes
+my ($reap_armed);
+my $ToClose; # sockets to close when event loop is done
our (
- $HaveEpoll, # Flag -- is epoll available? initially undefined.
- $HaveKQueue,
%DescriptorMap, # fd (num) -> PublicInbox::DS object
- $Epoll, # Global epoll fd (for epoll mode only)
- $KQueue, # Global kqueue fd ref (for kqueue mode only)
+ $Epoll, # Global epoll fd (or DSKQXS ref)
$_io, # IO::Handle for Epoll
- @ToClose, # sockets to close when event loop is done
$PostLoopCallback, # subref to call at the end of each loop, if defined (global)
$LoopTimeout, # timeout of event loop in milliseconds
- $DoneInit, # if we've done the one-time module init yet
@Timers, # timers
+ %UniqTimer,
+ $in_loop,
);
Reset();
=cut
sub Reset {
- %DescriptorMap = ();
- @ToClose = ();
- $LoopTimeout = -1; # no timeout by default
- @Timers = ();
-
- $PostLoopCallback = undef;
- $DoneInit = 0;
-
- # NOTE kqueue is close-on-fork, and we don't account for it, yet
- # OTOH, we (public-inbox) don't need this sub outside of tests...
- POSIX::close($$KQueue) if !$_io && $KQueue && $$KQueue >= 0;
- $KQueue = undef;
-
- $_io = undef; # close $Epoll
- $Epoll = undef;
-
- *EventLoop = *FirstTimeEventLoop;
+ do {
+ $in_loop = undef; # first in case DESTROY callbacks use this
+ %DescriptorMap = ();
+ @Timers = ();
+ %UniqTimer = ();
+ $PostLoopCallback = undef;
+
+ # we may be iterating inside one of these on our stack
+ my @q = delete @Stack{keys %Stack};
+ for my $q (@q) { @$q = () }
+ $EXPMAP = undef;
+ $wait_pids = $later_q = $nextq = $ToClose = undef;
+ $_io = undef; # closes real $Epoll FD
+ $Epoll = undef; # may call DSKQXS::DESTROY
+ } while (@Timers || keys(%Stack) || $nextq || $wait_pids ||
+ $later_q || $ToClose || keys(%DescriptorMap) ||
+ $PostLoopCallback || keys(%UniqTimer));
+
+ $reap_armed = undef;
+ $LoopTimeout = -1; # no timeout by default
}
=head2 C<< CLASS->SetLoopTimeout( $timeout ) >>
immediately.
=cut
-sub SetLoopTimeout {
- return $LoopTimeout = $_[1] + 0;
+sub SetLoopTimeout { $LoopTimeout = $_[1] + 0 }
+
+sub _add_named_timer {
+ my ($name, $secs, $coderef, @args) = @_;
+ my $fire_time = now() + $secs;
+ my $timer = [$fire_time, $name, $coderef, @args];
+
+ if (!@Timers || $fire_time >= $Timers[-1][0]) {
+ push @Timers, $timer;
+ return $timer;
+ }
+
+ # Now, where do we insert? (NOTE: this appears slow, algorithm-wise,
+ # but it was compared against calendar queues, heaps, naive push/sort,
+ # and a bunch of other versions, and found to be fastest with a large
+ # variety of datasets.)
+ for (my $i = 0; $i < @Timers; $i++) {
+ if ($Timers[$i][0] > $fire_time) {
+ splice(@Timers, $i, 0, $timer);
+ return $timer;
+ }
+ }
+ die "Shouldn't get here.";
}
-=head2 C<< CLASS->AddTimer( $seconds, $coderef ) >>
-
-Add a timer to occur $seconds from now. $seconds may be fractional, but timers
-are not guaranteed to fire at the exact time you ask for.
-
-Returns a timer object which you can call C<< $timer->cancel >> on if you need to.
-
-=cut
-sub AddTimer {
- my ($class, $secs, $coderef) = @_;
-
- if (!$secs) {
- my $timer = bless([0, $coderef], 'PublicInbox::DS::Timer');
- unshift(@Timers, $timer);
- return $timer;
- }
-
- my $fire_time = now() + $secs;
+sub add_timer { _add_named_timer(undef, @_) }
- my $timer = bless [$fire_time, $coderef], "PublicInbox::DS::Timer";
-
- if (!@Timers || $fire_time >= $Timers[-1][0]) {
- push @Timers, $timer;
- return $timer;
- }
-
- # Now, where do we insert? (NOTE: this appears slow, algorithm-wise,
- # but it was compared against calendar queues, heaps, naive push/sort,
- # and a bunch of other versions, and found to be fastest with a large
- # variety of datasets.)
- for (my $i = 0; $i < @Timers; $i++) {
- if ($Timers[$i][0] > $fire_time) {
- splice(@Timers, $i, 0, $timer);
- return $timer;
- }
- }
-
- die "Shouldn't get here.";
+sub add_uniq_timer { # ($name, $secs, $coderef, @args) = @_;
+ $UniqTimer{$_[0]} //= _add_named_timer(@_);
}
# keeping this around in case we support other FD types for now,
sub set_cloexec ($) {
my ($fd) = @_;
- $_io = IO::Handle->new_from_fd($fd, 'r+') or return;
+ open($_io, '+<&=', $fd) or return;
defined(my $fl = fcntl($_io, F_GETFD, 0)) or return;
fcntl($_io, F_SETFD, $fl | FD_CLOEXEC);
}
+# caller sets return value to $Epoll
sub _InitPoller
{
- return if $DoneInit;
- $DoneInit = 1;
-
- if ($HAVE_KQUEUE) {
- $KQueue = IO::KQueue->new();
- $HaveKQueue = defined $KQueue;
- if ($HaveKQueue) {
- *EventLoop = *KQueueEventLoop;
- }
- }
- elsif (PublicInbox::Syscall::epoll_defined()) {
- $Epoll = eval { epoll_create(1024); };
- $HaveEpoll = defined $Epoll && $Epoll >= 0;
- if ($HaveEpoll) {
- set_cloexec($Epoll);
- *EventLoop = *EpollEventLoop;
+ if (PublicInbox::Syscall::epoll_defined()) {
+ my $fd = epoll_create();
+ set_cloexec($fd) if (defined($fd) && $fd >= 0);
+ $fd;
+ } else {
+ my $cls;
+ for (qw(DSKQXS DSPoll)) {
+ $cls = "PublicInbox::$_";
+ last if eval "require $cls";
}
+ $cls->import(qw(epoll_ctl epoll_wait));
+ $cls->new;
}
}
C<PostLoopCallback> below for how to exit the loop.
=cut
-sub FirstTimeEventLoop {
- my $class = shift;
- _InitPoller();
+sub now () { clock_gettime(CLOCK_MONOTONIC) }
- if ($HaveEpoll) {
- EpollEventLoop($class);
- } elsif ($HaveKQueue) {
- KQueueEventLoop($class);
- }
+sub next_tick () {
+ my $q = $nextq or return;
+ $nextq = undef;
+ $Stack{cur_runq} = $q;
+ for my $obj (@$q) {
+ # 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($obj)) {
+ $obj->event_step;
+ } else {
+ $obj->();
+ }
+ }
+ delete $Stack{cur_runq};
}
-sub now () { clock_gettime(CLOCK_MONOTONIC) }
-
# runs timers and returns milliseconds for next one, or next event loop
sub RunTimers {
- return $LoopTimeout unless @Timers;
+ next_tick();
- my $now = now();
+ return (($nextq || $ToClose) ? 0 : $LoopTimeout) unless @Timers;
- # Run expired timers
- while (@Timers && $Timers[0][0] <= $now) {
- my $to_run = shift(@Timers);
- $to_run->[1]->($now) if $to_run->[1];
- }
+ my $now = now();
+
+ # Run expired timers
+ while (@Timers && $Timers[0][0] <= $now) {
+ my $to_run = shift(@Timers);
+ delete $UniqTimer{$to_run->[1] // ''};
+ $to_run->[2]->(@$to_run[3..$#$to_run]);
+ }
- return $LoopTimeout unless @Timers;
+ # timers may enqueue into nextq:
+ return 0 if ($nextq || $ToClose);
- # convert time to an even number of milliseconds, adding 1
- # extra, otherwise floating point fun can occur and we'll
- # call RunTimers like 20-30 times, each returning a timeout
- # of 0.0000212 seconds
- my $timeout = int(($Timers[0][0] - $now) * 1000) + 1;
+ return $LoopTimeout unless @Timers;
- # -1 is an infinite timeout, so prefer a real timeout
- return $timeout if $LoopTimeout == -1;
+ # convert time to an even number of milliseconds, adding 1
+ # extra, otherwise floating point fun can occur and we'll
+ # call RunTimers like 20-30 times, each returning a timeout
+ # of 0.0000212 seconds
+ my $timeout = int(($Timers[0][0] - $now) * 1000) + 1;
- # otherwise pick the lower of our regular timeout and time until
- # the next timer
- return $LoopTimeout if $LoopTimeout < $timeout;
- return $timeout;
+ # -1 is an infinite timeout, so prefer a real timeout
+ ($LoopTimeout < 0 || $LoopTimeout >= $timeout) ? $timeout : $LoopTimeout
}
-### The epoll-based event loop. Gets installed as EventLoop if IO::Epoll loads
-### okay.
-sub EpollEventLoop {
- my $class = shift;
+sub sig_setmask { sigprocmask(SIG_SETMASK, @_) or die "sigprocmask: $!" }
+
+sub block_signals () {
+ my $oldset = POSIX::SigSet->new;
+ my $newset = POSIX::SigSet->new;
+ $newset->fillset or die "fillset: $!";
+ sig_setmask($newset, $oldset);
+ $oldset;
+}
+
+# We can't use waitpid(-1) safely here since it can hit ``, system(),
+# and other things. So we scan the $wait_pids list, which is hopefully
+# not too big. We keep $wait_pids small by not calling dwaitpid()
+# until we've hit EOF when reading the stdout of the child.
+
+sub reap_pids {
+ $reap_armed = undef;
+ my $tmp = $wait_pids or return;
+ $wait_pids = undef;
+ $Stack{reap_runq} = $tmp;
+ my $oldset = block_signals();
+ foreach my $ary (@$tmp) {
+ my ($pid, $cb, $arg) = @$ary;
+ my $ret = waitpid($pid, WNOHANG);
+ if ($ret == 0) {
+ push @$wait_pids, $ary; # autovivifies @$wait_pids
+ } elsif ($ret == $pid) {
+ if ($cb) {
+ eval { $cb->($arg, $pid) };
+ warn "E: dwaitpid($pid) in_loop: $@" if $@;
+ }
+ } else {
+ warn "waitpid($pid, WNOHANG) = $ret, \$!=$!, \$?=$?";
+ }
+ }
+ sig_setmask($oldset);
+ delete $Stack{reap_runq};
+}
+
+# reentrant SIGCHLD handler (since reap_pids is not reentrant)
+sub enqueue_reap () { $reap_armed //= requeue(\&reap_pids) }
+
+sub in_loop () { $in_loop }
+
+# Internal function: run the post-event callback, send read events
+# for pushed-back data, and close pending connections. returns 1
+# if event loop should continue, or 0 to shut it all down.
+sub PostEventLoop () {
+ # now we can close sockets that wanted to close during our event
+ # processing. (we didn't want to close them during the loop, as we
+ # didn't want fd numbers being reused and confused during the event
+ # loop)
+ if (my $close_now = $ToClose) {
+ $ToClose = undef; # will be autovivified on push
+ @$close_now = map { fileno($_) } @$close_now;
+
+ # order matters, destroy expiry times, first:
+ delete @$EXPMAP{@$close_now};
+
+ # ->DESTROY methods may populate ToClose
+ delete @DescriptorMap{@$close_now};
+ }
+
+ # by default we keep running, unless a postloop callback cancels it
+ $PostLoopCallback ? $PostLoopCallback->(\%DescriptorMap) : 1;
+}
- while (1) {
- my @events;
- my $i;
+sub EventLoop {
+ $Epoll //= _InitPoller();
+ local $in_loop = 1;
+ my @events;
+ do {
my $timeout = RunTimers();
# get up to 1000 events
- my $evcount = epoll_wait($Epoll, 1000, $timeout, \@events);
- for ($i=0; $i<$evcount; $i++) {
+ epoll_wait($Epoll, 1000, $timeout, \@events);
+ for my $fd (@events) {
# it's possible epoll_wait returned many events, including some at the end
# that ones in the front triggered unregister-interest actions. if we
# can't find the %sock entry, it's because we're no longer interested
# in that event.
- $DescriptorMap{$events[$i]->[0]}->event_step;
- }
- return unless PostEventLoop();
- }
- exit 0;
-}
-
-### The kqueue-based event loop. Gets installed as EventLoop if IO::KQueue works
-### okay.
-sub KQueueEventLoop {
- my $class = shift;
-
- while (1) {
- my $timeout = RunTimers();
- my @ret = eval { $KQueue->kevent($timeout) };
- if (my $err = $@) {
- # workaround https://rt.cpan.org/Ticket/Display.html?id=116615
- if ($err =~ /Interrupted system call/) {
- @ret = ();
- } else {
- die $err;
- }
- }
- foreach my $kev (@ret) {
- $DescriptorMap{$kev->[0]}->event_step;
+ # guard stack-not-refcounted w/ Carp + @DB::args
+ my $obj = $DescriptorMap{$fd};
+ $obj->event_step;
}
- return unless PostEventLoop();
- }
-
- exit(0);
+ } while (PostEventLoop());
+ _run_later();
}
=head2 C<< CLASS->SetPostLoopCallback( CODEREF ) >>
$PostLoopCallback = (defined $ref && ref $ref eq 'CODE') ? $ref : undef;
}
-# Internal function: run the post-event callback, send read events
-# for pushed-back data, and close pending connections. returns 1
-# if event loop should continue, or 0 to shut it all down.
-sub PostEventLoop {
- # now we can close sockets that wanted to close during our event processing.
- # (we didn't want to close them during the loop, as we didn't want fd numbers
- # being reused and confused during the event loop)
- while (my $sock = shift @ToClose) {
- my $fd = fileno($sock);
-
- # close the socket. (not a PublicInbox::DS close)
- $sock->close;
-
- # and now we can finally remove the fd from the map. see
- # comment above in ->close.
- delete $DescriptorMap{$fd};
- }
-
-
- # by default we keep running, unless a postloop callback (either per-object
- # or global) cancels it
- my $keep_running = 1;
-
- # now we're at the very end, call callback if defined
- if (defined $PostLoopCallback) {
- $keep_running &&= $PostLoopCallback->(\%DescriptorMap);
- }
-
- return $keep_running;
-}
-
-# map EPOLL* bits to kqueue EV_* flags for EV_SET
-sub kq_flag ($$) {
- my ($bit, $ev) = @_;
- if ($ev & $bit) {
- my $fl = EV_ADD() | EV_ENABLE();
- ($ev & EPOLLONESHOT) ? ($fl|EV_ONESHOT()) : $fl;
- } else {
- EV_DISABLE();
- }
-}
-
#####################################################################
### PublicInbox::DS-the-object code
#####################################################################
=cut
sub new {
my ($self, $sock, $ev) = @_;
- $self = fields::new($self) unless ref $self;
-
$self->{sock} = $sock;
my $fd = fileno($sock);
- Carp::cluck("undef sock and/or fd in PublicInbox::DS->new. sock=" . ($sock || "") . ", fd=" . ($fd || ""))
- unless $sock && $fd;
-
- _InitPoller();
-
- if ($HaveEpoll) {
+ $Epoll //= _InitPoller();
retry:
- if (epoll_ctl($Epoll, EPOLL_CTL_ADD, $fd, $ev)) {
- if ($! == EINVAL && ($ev & EPOLLEXCLUSIVE)) {
- $ev &= ~EPOLLEXCLUSIVE;
- goto retry;
- }
- die "couldn't add epoll watch for $fd: $!\n";
+ if (epoll_ctl($Epoll, EPOLL_CTL_ADD, $fd, $ev)) {
+ if ($! == EINVAL && ($ev & EPOLLEXCLUSIVE)) {
+ $ev &= ~EPOLLEXCLUSIVE;
+ goto retry;
}
+ die "EPOLL_CTL_ADD $self/$sock/$fd: $!";
}
- elsif ($HaveKQueue) {
- $KQueue->EV_SET($fd, EVFILT_READ(), EV_ADD() | kq_flag(EPOLLIN, $ev));
- $KQueue->EV_SET($fd, EVFILT_WRITE(), EV_ADD() | kq_flag(EPOLLOUT, $ev));
- }
-
- Carp::cluck("PublicInbox::DS::new blowing away existing descriptor map for fd=$fd ($DescriptorMap{$fd})")
- if $DescriptorMap{$fd};
+ croak("FD:$fd in use by $DescriptorMap{$fd} (for $self/$sock)")
+ if defined($DescriptorMap{$fd});
$DescriptorMap{$fd} = $self;
- return $self;
}
### I N S T A N C E M E T H O D S
#####################################################################
+sub requeue ($) { push @$nextq, $_[0] } # autovivifies
+
=head2 C<< $obj->close >>
Close the socket.
# if we're using epoll, we have to remove this from our epoll fd so we stop getting
# notifications about it
- if ($HaveEpoll) {
- my $fd = fileno($sock);
- epoll_ctl($Epoll, EPOLL_CTL_DEL, $fd, 0) and
- confess("EPOLL_CTL_DEL: $!");
- }
+ my $fd = fileno($sock);
+ epoll_ctl($Epoll, EPOLL_CTL_DEL, $fd, 0) and
+ croak("EPOLL_CTL_DEL($self/$sock): $!");
# we explicitly don't delete from DescriptorMap here until we
# actually close the socket, as we might be in the middle of
# defer closing the actual socket until the event loop is done
# processing this round of events. (otherwise we might reuse fds)
- push @ToClose, $sock;
+ push @$ToClose, $sock; # autovivifies $ToClose
return 0;
}
# portable, non-thread-safe sendfile emulation (no pread, yet)
-sub psendfile ($$$) {
- my ($sock, $fh, $off) = @_;
+sub send_tmpio ($$) {
+ my ($sock, $tmpio) = @_;
- sysseek($fh, $$off, SEEK_SET) or return;
- defined(my $to_write = sysread($fh, my $buf, 16384)) or return;
+ sysseek($tmpio->[0], $tmpio->[1], SEEK_SET) or return;
+ my $n = $tmpio->[2] // 65536;
+ $n = 65536 if $n > 65536;
+ defined(my $to_write = sysread($tmpio->[0], my $buf, $n)) or return;
my $written = 0;
while ($to_write > 0) {
if (defined(my $w = syswrite($sock, $buf, $to_write, $written))) {
last;
}
}
- $$off += $written;
+ $tmpio->[1] += $written; # offset
+ $tmpio->[2] -= $written if defined($tmpio->[2]); # length
$written;
}
+sub epbit ($$) { # (sock, default)
+ $_[0]->can('stop_SSL') ? PublicInbox::TLS::epollbit() : $_[1];
+}
+
# returns 1 if done, 0 if incomplete
sub flush_write ($) {
my ($self) = @_;
+ my $sock = $self->{sock} or return;
my $wbuf = $self->{wbuf} or return 1;
- my $sock = $self->{sock} or return 1;
next_buf:
while (my $bref = $wbuf->[0]) {
if (ref($bref) ne 'CODE') {
- my $off = delete($self->{wbuf_off}) // 0;
- while (1) {
- my $w = psendfile($sock, $bref, \$off);
+ while ($sock) {
+ my $w = send_tmpio($sock, $bref); # bref is tmpio
if (defined $w) {
if ($w == 0) {
shift @$wbuf;
goto next_buf;
}
} elsif ($! == EAGAIN) {
- $self->{wbuf_off} = $off;
- watch($self, EPOLLOUT|EPOLLONESHOT);
+ my $ev = epbit($sock, EPOLLOUT) or return $self->close;
+ epwait($sock, $ev | EPOLLONESHOT);
return 0;
} else {
return $self->close;
}
}
- } else { #($ref eq 'CODE') {
+ } else { #(ref($bref) eq 'CODE') {
shift @$wbuf;
+ my $before = scalar(@$wbuf);
$bref->($self);
+
+ # bref may be enqueueing more CODE to call (see accept_tls_step)
+ return 0 if (scalar(@$wbuf) > $before);
}
} # while @$wbuf
1; # all done
}
-sub write_in_full ($$$$) {
- my ($fh, $bref, $len, $off) = @_;
- my $rv = 0;
- while ($len > 0) {
- my $w = syswrite($fh, $$bref, $len, $off);
- return ($rv ? $rv : $w) unless $w; # undef or 0
- $rv += $w;
- $len -= $w;
- $off += $w;
+sub rbuf_idle ($$) {
+ my ($self, $rbuf) = @_;
+ if ($$rbuf eq '') { # who knows how long till we can read again
+ delete $self->{rbuf};
+ } else {
+ $self->{rbuf} = $rbuf;
}
- $rv
}
-sub tmpbuf ($$) {
- my ($bref, $off) = @_;
- # open(my $fh, '+>>', undef) doesn't set O_APPEND
- my ($fh, $path) = tempfile('wbuf-XXXXXXX', TMPDIR => 1);
- open $fh, '+>>', $path or die "open: $!";
- unlink $path;
- my $to_write = bytes::length($$bref) - $off;
- my $w = write_in_full($fh, $bref, $to_write, $off);
- die "write_in_full ($to_write): $!" unless defined $w;
- $w == $to_write ? $fh : die("short write $w < $to_write");
+sub do_read ($$$;$) {
+ my ($self, $rbuf, $len, $off) = @_;
+ my $r = sysread(my $sock = $self->{sock}, $$rbuf, $len, $off // 0);
+ return ($r == 0 ? $self->close : $r) if defined $r;
+ # common for clients to break connections without warning,
+ # would be too noisy to log here:
+ if ($! == EAGAIN) {
+ my $ev = epbit($sock, EPOLLIN) or return $self->close;
+ epwait($sock, $ev | EPOLLONESHOT);
+ rbuf_idle($self, $rbuf);
+ 0;
+ } else {
+ $self->close;
+ }
+}
+
+# drop the socket if we hit unrecoverable errors on our system which
+# require BOFH attention: ENOSPC, EFBIG, EIO, EMFILE, ENFILE...
+sub drop {
+ my $self = shift;
+ carp(@_);
+ $self->close;
+}
+
+# n.b.: use ->write/->read for this buffer to allow compatibility with
+# PerlIO::mmap or PerlIO::scalar if needed
+sub tmpio ($$$) {
+ my ($self, $bref, $off) = @_;
+ my $fh = tmpfile('wbuf', $self->{sock}, O_APPEND) or
+ return drop($self, "tmpfile $!");
+ $fh->autoflush(1);
+ my $len = length($$bref) - $off;
+ print $fh substr($$bref, $off, $len) or
+ return drop($self, "write ($len): $!");
+ [ $fh, 0 ] # [1] = offset, [2] = length, not set by us
}
=head2 C<< $obj->write( $data ) >>
my $sock = $self->{sock} or return 1;
my $ref = ref $data;
my $bref = $ref ? $data : \$data;
- if (my $wbuf = $self->{wbuf}) { # already buffering, can't write more...
+ my $wbuf = $self->{wbuf};
+ if ($wbuf && scalar(@$wbuf)) { # already buffering, can't write more...
if ($ref eq 'CODE') {
push @$wbuf, $bref;
} else {
- my $last = $wbuf->[-1];
- if (ref($last) eq 'GLOB') { # append to tmp file buffer
- write_in_full($last, $bref, bytes::length($$bref), 0);
+ my $tmpio = $wbuf->[-1];
+ if ($tmpio && !defined($tmpio->[2])) { # append to tmp file buffer
+ $tmpio->[0]->print($$bref) or return drop($self, "print: $!");
} else {
- push @$wbuf, tmpbuf($bref, 0);
+ my $tmpio = tmpio($self, $bref, 0) or return 0;
+ push @$wbuf, $tmpio;
}
}
return 0;
$bref->($self);
return 1;
} else {
- my $to_write = bytes::length($$bref);
+ my $to_write = length($$bref);
my $written = syswrite($sock, $$bref, $to_write);
if (defined $written) {
return 1 if $written == $to_write;
+ requeue($self); # runs: event_step -> flush_write
} elsif ($! == EAGAIN) {
+ my $ev = epbit($sock, EPOLLOUT) or return $self->close;
+ epwait($sock, $ev | EPOLLONESHOT);
$written = 0;
} else {
return $self->close;
}
- $self->{wbuf} = [ tmpbuf($bref, $written) ];
- watch($self, EPOLLOUT|EPOLLONESHOT);
+
+ # deal with EAGAIN or partial write:
+ my $tmpio = tmpio($self, $bref, $written) or return 0;
+
+ # wbuf may be an empty array if we're being called inside
+ # ->flush_write via CODE bref:
+ push @{$self->{wbuf}}, $tmpio; # autovivifies
return 0;
}
}
sub msg_more ($$) {
my $self = $_[0];
my $sock = $self->{sock} or return 1;
+ my $wbuf = $self->{wbuf};
- if (MSG_MORE && !$self->{wbuf}) {
+ if (MSG_MORE && (!defined($wbuf) || !scalar(@$wbuf)) &&
+ !$sock->can('stop_SSL')) {
my $n = send($sock, $_[1], MSG_MORE);
if (defined $n) {
- my $nlen = bytes::length($_[1]) - $n;
+ my $nlen = length($_[1]) - $n;
return 1 if $nlen == 0; # all done!
-
# queue up the unwritten substring:
- $self->{wbuf} = [ tmpbuf(\($_[1]), $n) ];
- watch($self, EPOLLOUT|EPOLLONESHOT);
+ my $tmpio = tmpio($self, \($_[1]), $n) or return 0;
+ push @{$self->{wbuf}}, $tmpio; # autovivifies
+ epwait($sock, EPOLLOUT|EPOLLONESHOT);
return 0;
}
}
- $self->write(\($_[1]));
+
+ # don't redispatch into NNTPdeflate::write
+ PublicInbox::DS::write($self, \($_[1]));
}
-sub watch ($$) {
- my ($self, $ev) = @_;
+sub epwait ($$) {
+ my ($sock, $ev) = @_;
+ epoll_ctl($Epoll, EPOLL_CTL_MOD, fileno($sock), $ev) and
+ croak("EPOLL_CTL_MOD($sock): $!");
+}
+
+# return true if complete, false if incomplete (or failure)
+sub accept_tls_step ($) {
+ my ($self) = @_;
my $sock = $self->{sock} or return;
- my $fd = fileno($sock);
- if ($HaveEpoll) {
- epoll_ctl($Epoll, EPOLL_CTL_MOD, $fd, $ev) and
- confess("EPOLL_CTL_MOD $!");
- } elsif ($HaveKQueue) {
- $KQueue->EV_SET($fd, EVFILT_READ(), kq_flag(EPOLLIN, $ev));
- $KQueue->EV_SET($fd, EVFILT_WRITE(), kq_flag(EPOLLOUT, $ev));
+ return 1 if $sock->accept_SSL;
+ return $self->close if $! != EAGAIN;
+ my $ev = PublicInbox::TLS::epollbit() or return $self->close;
+ epwait($sock, $ev | EPOLLONESHOT);
+ unshift(@{$self->{wbuf}}, \&accept_tls_step); # autovivifies
+ 0;
+}
+
+# return true if complete, false if incomplete (or failure)
+sub shutdn_tls_step ($) {
+ my ($self) = @_;
+ my $sock = $self->{sock} or return;
+ return $self->close if $sock->stop_SSL(SSL_fast_shutdown => 1);
+ return $self->close if $! != EAGAIN;
+ my $ev = PublicInbox::TLS::epollbit() or return $self->close;
+ epwait($sock, $ev | EPOLLONESHOT);
+ unshift(@{$self->{wbuf}}, \&shutdn_tls_step); # autovivifies
+ 0;
+}
+
+# don't bother with shutdown($sock, 2), we don't fork+exec w/o CLOEXEC
+# or fork w/o exec, so no inadvertent socket sharing
+sub shutdn ($) {
+ my ($self) = @_;
+ my $sock = $self->{sock} or return;
+ if ($sock->can('stop_SSL')) {
+ shutdn_tls_step($self);
+ } else {
+ $self->close;
}
}
-sub watch_in1 ($) { watch($_[0], EPOLLIN | EPOLLONESHOT) }
+sub dwaitpid ($;$$) {
+ my ($pid, $cb, $arg) = @_;
+ if ($in_loop) {
+ push @$wait_pids, [ $pid, $cb, $arg ];
+ # We could've just missed our SIGCHLD, cover it, here:
+ enqueue_reap();
+ } else {
+ my $ret = waitpid($pid, 0);
+ if ($ret == $pid) {
+ if ($cb) {
+ eval { $cb->($arg, $pid) };
+ carp "E: dwaitpid($pid) !in_loop: $@" if $@;
+ }
+ } else {
+ carp "waitpid($pid, 0) = $ret, \$!=$!, \$?=$?";
+ }
+ }
+}
+
+sub _run_later () {
+ my $q = $later_q or return;
+ $later_q = undef;
+ $Stack{later_q} = $q;
+ $_->() for @$q;
+ delete $Stack{later_q};
+}
+
+sub later ($) {
+ push @$later_q, $_[0]; # autovivifies @$later_q
+ add_uniq_timer('later', 60, \&_run_later);
+}
+
+sub expire_old () {
+ my $cur = $EXPMAP or return;
+ $EXPMAP = undef;
+ my $old = now() - $EXPTIME;
+ while (my ($fd, $idle_at) = each %$cur) {
+ if ($idle_at < $old) {
+ my $ds_obj = $DescriptorMap{$fd};
+ $EXPMAP->{$fd} = $idle_at if !$ds_obj->shutdn;
+ } else {
+ $EXPMAP->{$fd} = $idle_at;
+ }
+ }
+ add_uniq_timer('expire', 60, \&expire_old) if $EXPMAP;
+}
+
+sub update_idle_time {
+ my ($self) = @_;
+ my $sock = $self->{sock} or return;
+ $EXPMAP->{fileno($sock)} = now();
+ add_uniq_timer('expire', 60, \&expire_old);
+}
-package PublicInbox::DS::Timer;
-# [$abs_float_firetime, $coderef];
-sub cancel {
- $_[0][1] = undef;
+sub not_idle_long {
+ my ($self, $now) = @_;
+ my $sock = $self->{sock} or return;
+ my $idle_at = $EXPMAP->{fileno($sock)} or return;
+ ($idle_at + $EXPTIME) > $now;
}
1;