qpsmtpd/lib/Danga/Socket.pm
Matt Sergeant 5853c3a011 Cleanup Timer code
git-svn-id: https://svn.perl.org/qpsmtpd/branches/high_perf@444 958fd67b-6ff1-0310-b445-bb7760255be9
2005-06-22 18:24:34 +00:00

925 lines
28 KiB
Perl

###########################################################################
=head1 NAME
Danga::Socket - Event-driven async IO class
=head1 SYNOPSIS
use base ('Danga::Socket');
=head1 DESCRIPTION
This is an abstract base class which provides the basic framework for
event-driven asynchronous IO.
=cut
###########################################################################
package Danga::Socket;
use strict;
use vars qw{$VERSION};
$VERSION = do { my @r = (q$Revision: 1.4 $ =~ /\d+/g); sprintf "%d."."%02d" x $#r, @r };
use fields qw(sock fd write_buf write_buf_offset write_buf_size
read_push_back post_loop_callback
peer_ip
closed event_watch debug_level);
use Errno qw(EINPROGRESS EWOULDBLOCK EISCONN
EPIPE EAGAIN EBADF ECONNRESET);
use Socket qw(IPPROTO_TCP);
use Carp qw{croak confess};
use constant TCP_CORK => 3; # FIXME: not hard-coded (Linux-specific too)
use constant DebugLevel => 0;
# for epoll definitions:
our $HAVE_SYSCALL_PH = eval { require 'syscall.ph'; 1 } || eval { require 'sys/syscall.ph'; 1 };
our $HAVE_KQUEUE = eval { require IO::KQueue; 1 };
# Explicitly define the poll constants, as either one set or the other won't be
# loaded. They're also badly implemented in IO::Epoll:
# The IO::Epoll module is buggy in that it doesn't export constants efficiently
# (at least as of 0.01), so doing constants ourselves saves 13% of the user CPU
# time
use constant EPOLLIN => 1;
use constant EPOLLOUT => 4;
use constant EPOLLERR => 8;
use constant EPOLLHUP => 16;
use constant EPOLL_CTL_ADD => 1;
use constant EPOLL_CTL_DEL => 2;
use constant EPOLL_CTL_MOD => 3;
use constant POLLIN => 1;
use constant POLLOUT => 4;
use constant POLLERR => 8;
use constant POLLHUP => 16;
use constant POLLNVAL => 32;
# keep track of active clients
our (
$HaveEpoll, # Flag -- is epoll available? initially undefined.
$HaveKQueue,
%DescriptorMap, # fd (num) -> Danga::Socket object
%PushBackSet, # fd (num) -> Danga::Socket (fds with pushed back read data)
$Epoll, # Global epoll fd (for epoll mode only)
$KQueue, # Global kqueue fd (for kqueue mode only)
@ToClose, # sockets to close when event loop is done
%OtherFds, # A hash of "other" (non-Danga::Socket) file
# descriptors for the event loop to track.
$PostLoopCallback, # subref to call at the end of each loop, if defined
%PLCMap, # fd (num) -> PostLoopCallback
@Timers, # timers
);
%OtherFds = ();
#####################################################################
### C L A S S M E T H O D S
#####################################################################
### (CLASS) METHOD: HaveEpoll()
### Returns a true value if this class will use IO::Epoll for async IO.
sub HaveEpoll { $HaveEpoll };
### (CLASS) METHOD: WatchedSockets()
### Returns the number of file descriptors which are registered with the global
### poll object.
sub WatchedSockets {
return scalar keys %DescriptorMap;
}
*watched_sockets = *WatchedSockets;
### (CLASS) METHOD: ToClose()
### Return the list of sockets that are awaiting close() at the end of the
### current event loop.
sub ToClose { return @ToClose; }
### (CLASS) METHOD: OtherFds( [%fdmap] )
### Get/set the hash of file descriptors that need processing in parallel with
### the registered Danga::Socket objects.
sub OtherFds {
my $class = shift;
if ( @_ ) { %OtherFds = @_ }
return wantarray ? %OtherFds : \%OtherFds;
}
sub AddTimer {
my $class = shift;
my ($secs, $coderef) = @_;
my $timeout = time + $secs;
if (!@Timers || ($timeout > $Timers[-1][0])) {
push @Timers, [$timeout, $coderef];
return;
}
# Now where do we insert...
for (my $i = 0; $i < @Timers; $i++) {
if ($Timers[$i][0] > $timeout) {
splice(@Timers, $i, 0, [$timeout, $coderef]);
return;
}
}
die "Shouldn't get here spank matt.";
}
### (CLASS) METHOD: DescriptorMap()
### Get the hash of Danga::Socket objects keyed by the file descriptor they are
### wrapping.
sub DescriptorMap {
return wantarray ? %DescriptorMap : \%DescriptorMap;
}
*descriptor_map = *DescriptorMap;
*get_sock_ref = *DescriptorMap;
sub init_poller
{
return if defined $HaveEpoll || $HaveKQueue;
if ($HAVE_KQUEUE) {
$KQueue = IO::KQueue->new();
$HaveKQueue = $KQueue >= 0;
if ($HaveKQueue) {
*EventLoop = *KQueueEventLoop;
}
}
else {
$Epoll = eval { epoll_create(1024); };
$HaveEpoll = $Epoll >= 0;
if ($HaveEpoll) {
*EventLoop = *EpollEventLoop;
}
}
if (!$HaveEpoll && !$HaveKQueue) {
require IO::Poll;
*EventLoop = *PollEventLoop;
}
}
### FUNCTION: EventLoop()
### Start processing IO events.
sub EventLoop {
my $class = shift;
init_poller();
if ($HaveEpoll) {
EpollEventLoop($class);
} else {
PollEventLoop($class);
}
}
### The kqueue-based event loop. Gets installed as EventLoop if IO::KQueue works
### okay.
sub KQueueEventLoop {
my $class = shift;
foreach my $fd (keys %OtherFds) {
$KQueue->EV_SET($fd, IO::KQueue::EVFILT_READ(), IO::KQueue::EV_ADD());
}
while (1) {
my $now = time;
# Run expired timers
while (@Timers && $Timers[0][0] <= $now) {
my $to_run = shift(@Timers);
$to_run->[1]->($now);
}
# Get next timeout
my $timeout = @Timers ? ($Timers[0][0] - $now) : 1;
my @ret = $KQueue->kevent($timeout * 1000);
if (!@ret) {
foreach my $fd ( keys %DescriptorMap ) {
my Danga::Socket $sock = $DescriptorMap{$fd};
if ($sock->can('ticker')) {
$sock->ticker;
}
}
}
my @objs;
foreach my $kev (@ret) {
my ($fd, $filter, $flags, $fflags) = @$kev;
my Danga::Socket $pob = $DescriptorMap{$fd};
# prioritise OtherFds first - likely to be accept() socks (?)
if (!$pob) {
if (my $code = $OtherFds{$fd}) {
$code->($filter);
}
next;
}
DebugLevel >= 1 && $class->DebugMsg("Event: fd=%d (%s), flags=%d \@ %s\n",
$fd, ref($pob), $flags, time);
push @objs, [$pob, $filter, $flags, $fflags];
}
# TODO - prioritize the objects
foreach (@objs) {
my ($pob, $filter, $flags, $fflags) = @$_;
$pob->event_read if $filter == IO::KQueue::EVFILT_READ() && !$pob->{closed};
$pob->event_write if $filter == IO::KQueue::EVFILT_WRITE() && !$pob->{closed};
if ($flags == IO::KQueue::EV_EOF() && !$pob->{closed}) {
if ($fflags) {
$pob->event_err;
} else {
$pob->event_hup;
}
}
}
return unless PostEventLoop();
}
exit(0);
}
### The epoll-based event loop. Gets installed as EventLoop if IO::Epoll loads
### okay.
sub EpollEventLoop {
my $class = shift;
foreach my $fd ( keys %OtherFds ) {
epoll_ctl($Epoll, EPOLL_CTL_ADD, $fd, EPOLLIN);
}
while (1) {
my $now = time;
# Run expired timers
while (@Timers && $Timers[0][0] <= $now) {
my $to_run = shift(@Timers);
$to_run->[1]->($now);
}
# Get next timeout
my $timeout = @Timers ? ($Timers[0][0] - $now) : 1;
my @events;
my $i;
my $evcount;
# get up to 1000 events, 1000ms timeout
while ($evcount = epoll_wait($Epoll, 1000, $timeout * 1000, \@events)) {
my @objs;
EVENT:
for ($i=0; $i<$evcount; $i++) {
my $ev = $events[$i];
# 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.
my Danga::Socket $pob = $DescriptorMap{$ev->[0]};
my $code;
my $state = $ev->[1];
# if we didn't find a Perlbal::Socket subclass for that fd, try other
# pseudo-registered (above) fds.
if (! $pob) {
if (my $code = $OtherFds{$ev->[0]}) {
$code->($state);
}
next;
}
DebugLevel >= 1 && $class->DebugMsg("Event: fd=%d (%s), state=%d \@ %s\n",
$ev->[0], ref($pob), $ev->[1], time);
push @objs, [$pob, $state];
}
foreach (@objs) {
my ($pob, $state) = @$_;
$pob->event_read if $state & EPOLLIN && ! $pob->{closed};
$pob->event_write if $state & EPOLLOUT && ! $pob->{closed};
$pob->event_err if $state & EPOLLERR && ! $pob->{closed};
$pob->event_hup if $state & EPOLLHUP && ! $pob->{closed};
}
return unless PostEventLoop();
}
foreach my $fd ( keys %DescriptorMap ) {
my Danga::Socket $sock = $DescriptorMap{$fd};
if ($sock->can('ticker')) {
$sock->ticker;
}
}
return unless PostEventLoop();
print STDERR "Event loop ending; restarting.\n";
}
exit 0;
}
### The fallback IO::Poll-based event loop. Gets installed as EventLoop if
### IO::Epoll fails to load.
sub PollEventLoop {
my $class = shift;
my Danga::Socket $pob;
while (1) {
my $now = time;
# Run expired timers
while (@Timers && $Timers[0][0] <= $now) {
my $to_run = shift(@Timers);
$to_run->[1]->($now);
}
# Get next timeout
my $timeout = @Timers ? ($Timers[0][0] - $now) : 1;
# the following sets up @poll as a series of ($poll,$event_mask)
# items, then uses IO::Poll::_poll, implemented in XS, which
# modifies the array in place with the even elements being
# replaced with the event masks that occured.
my @poll;
foreach my $fd ( keys %OtherFds ) {
push @poll, $fd, POLLIN;
}
foreach my $fd ( keys %DescriptorMap ) {
my Danga::Socket $sock = $DescriptorMap{$fd};
push @poll, $fd, $sock->{event_watch};
}
return 0 unless @poll;
my $count = IO::Poll::_poll($timeout * 1000, @poll);
if (!$count) {
foreach my $fd ( keys %DescriptorMap ) {
my Danga::Socket $sock = $DescriptorMap{$fd};
if ($sock->can('ticker')) {
$sock->ticker;
}
}
next;
}
# Fetch handles with read events
while (@poll) {
my ($fd, $state) = splice(@poll, 0, 2);
next unless $state;
$pob = $DescriptorMap{$fd};
if ( !$pob && (my $code = $OtherFds{$fd}) ) {
$code->($state);
next;
}
$pob->event_read if $state & POLLIN && ! $pob->{closed};
$pob->event_write if $state & POLLOUT && ! $pob->{closed};
$pob->event_err if $state & POLLERR && ! $pob->{closed};
$pob->event_hup if $state & POLLHUP && ! $pob->{closed};
}
return unless PostEventLoop();
}
exit 0;
}
## PostEventLoop is called at the end of the event loop to process things
# like close() calls.
sub PostEventLoop {
# fire read events for objects with pushed-back read data
my $loop = 1;
while ($loop) {
$loop = 0;
foreach my $fd (keys %PushBackSet) {
my Danga::Socket $pob = $PushBackSet{$fd};
next unless (! $pob->{closed} &&
$pob->{event_watch} & POLLIN);
$loop = 1;
$pob->event_read;
}
}
# 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)
foreach my $f (@ToClose) {
close($f);
}
@ToClose = ();
# now we're at the very end, call per-connection callbacks if defined
my $ret = 1; # use $ret so's to not starve some FDs; return 0 if any PLCs return 0
for my $plc (values %PLCMap) {
$ret &&= $plc->(\%DescriptorMap, \%OtherFds);
}
# now we're at the very end, call global callback if defined
if (defined $PostLoopCallback) {
$ret &&= $PostLoopCallback->(\%DescriptorMap, \%OtherFds);
}
return $ret;
}
### (CLASS) METHOD: DebugMsg( $format, @args )
### Print the debugging message specified by the C<sprintf>-style I<format> and
### I<args>
sub DebugMsg {
my ( $class, $fmt, @args ) = @_;
chomp $fmt;
printf STDERR ">>> $fmt\n", @args;
}
### METHOD: new( $socket )
### Create a new Danga::Socket object for the given I<socket> which will react
### to events on it during the C<wait_loop>.
sub new {
my Danga::Socket $self = shift;
$self = fields::new($self) unless ref $self;
my $sock = shift;
$self->{sock} = $sock;
my $fd = fileno($sock);
$self->{fd} = $fd;
$self->{write_buf} = [];
$self->{write_buf_offset} = 0;
$self->{write_buf_size} = 0;
$self->{closed} = 0;
$self->{read_push_back} = [];
$self->{post_loop_callback} = undef;
$self->{event_watch} = POLLERR|POLLHUP|POLLNVAL;
init_poller();
if ($HaveEpoll) {
epoll_ctl($Epoll, EPOLL_CTL_ADD, $fd, $self->{event_watch})
and die "couldn't add epoll watch for $fd\n";
}
elsif ($HaveKQueue) {
# Add them to the queue but disabled for now
$KQueue->EV_SET($fd, IO::KQueue::EVFILT_READ(),
IO::KQueue::EV_ADD() | IO::KQueue::EV_DISABLE());
$KQueue->EV_SET($fd, IO::KQueue::EVFILT_WRITE(),
IO::KQueue::EV_ADD() | IO::KQueue::EV_DISABLE());
}
$DescriptorMap{$fd} = $self;
return $self;
}
#####################################################################
### I N S T A N C E M E T H O D S
#####################################################################
### METHOD: tcp_cork( $boolean )
### Turn TCP_CORK on or off depending on the value of I<boolean>.
sub tcp_cork {
my Danga::Socket $self = shift;
my $val = shift;
# FIXME: Linux-specific.
setsockopt($self->{sock}, IPPROTO_TCP, TCP_CORK,
pack("l", $val ? 1 : 0)) || die "setsockopt: $!";
}
### METHOD: close( [$reason] )
### Close the socket. The I<reason> argument will be used in debugging messages.
sub close {
my Danga::Socket $self = shift;
my $reason = shift || "";
my $fd = $self->{fd};
my $sock = $self->{sock};
$self->{closed} = 1;
# we need to flush our write buffer, as there may
# be self-referential closures (sub { $client->close })
# preventing the object from being destroyed
$self->{write_buf} = [];
if (DebugLevel) {
my ($pkg, $filename, $line) = caller;
print STDERR "Closing \#$fd due to $pkg/$filename/$line ($reason)\n";
}
if ($HaveEpoll) {
if (epoll_ctl($Epoll, EPOLL_CTL_DEL, $fd, $self->{event_watch}) == 0) {
DebugLevel >= 1 && $self->debugmsg("Client %d disconnected.\n", $fd);
} else {
DebugLevel >= 1 && $self->debugmsg("poll->remove failed on fd %d\n", $fd);
}
}
delete $PLCMap{$fd};
delete $DescriptorMap{$fd};
delete $PushBackSet{$fd};
# defer closing the actual socket until the event loop is done
# processing this round of events. (otherwise we might reuse fds)
push @ToClose, $sock;
return 0;
}
### METHOD: sock()
### Returns the underlying IO::Handle for the object.
sub sock {
my Danga::Socket $self = shift;
return $self->{sock};
}
### METHOD: write( $data )
### Write the specified data to the underlying handle. I<data> may be scalar,
### scalar ref, code ref (to run when there), or undef just to kick-start.
### Returns 1 if writes all went through, or 0 if there are writes in queue. If
### it returns 1, caller should stop waiting for 'writable' events)
sub write {
my Danga::Socket $self;
my $data;
($self, $data) = @_;
# nobody should be writing to closed sockets, but caller code can
# do two writes within an event, have the first fail and
# disconnect the other side (whose destructor then closes the
# calling object, but it's still in a method), and then the
# now-dead object does its second write. that is this case. we
# just lie and say it worked. it'll be dead soon and won't be
# hurt by this lie.
return 1 if $self->{closed};
my $bref;
# just queue data if there's already a wait
my $need_queue;
if (defined $data) {
$bref = ref $data ? $data : \$data;
if ($self->{write_buf_size}) {
push @{$self->{write_buf}}, $bref;
$self->{write_buf_size} += ref $bref eq "SCALAR" ? length($$bref) : 1;
return 0;
}
# this flag says we're bypassing the queue system, knowing we're the
# only outstanding write, and hoping we don't ever need to use it.
# if so later, though, we'll need to queue
$need_queue = 1;
}
WRITE:
while (1) {
return 1 unless $bref ||= $self->{write_buf}[0];
my $len;
eval {
$len = length($$bref); # this will die if $bref is a code ref, caught below
};
if ($@) {
if (ref $bref eq "CODE") {
unless ($need_queue) {
$self->{write_buf_size}--; # code refs are worth 1
shift @{$self->{write_buf}};
}
$bref->();
undef $bref;
next WRITE;
}
die "Write error: $@ <$bref>";
}
my $to_write = $len - $self->{write_buf_offset};
my $written = syswrite($self->{sock}, $$bref, $to_write, $self->{write_buf_offset});
if (! defined $written) {
if ($! == EPIPE) {
return $self->close("EPIPE");
} elsif ($! == EAGAIN) {
# since connection has stuff to write, it should now be
# interested in pending writes:
if ($need_queue) {
push @{$self->{write_buf}}, $bref;
$self->{write_buf_size} += $len;
}
$self->watch_write(1);
return 0;
} elsif ($! == ECONNRESET) {
return $self->close("ECONNRESET");
}
DebugLevel >= 1 && $self->debugmsg("Closing connection ($self) due to write error: $!\n");
return $self->close("write_error");
} elsif ($written != $to_write) {
DebugLevel >= 2 && $self->debugmsg("Wrote PARTIAL %d bytes to %d",
$written, $self->{fd});
if ($need_queue) {
push @{$self->{write_buf}}, $bref;
$self->{write_buf_size} += $len;
}
# since connection has stuff to write, it should now be
# interested in pending writes:
$self->{write_buf_offset} += $written;
$self->{write_buf_size} -= $written;
$self->watch_write(1);
return 0;
} elsif ($written == $to_write) {
DebugLevel >= 2 && $self->debugmsg("Wrote ALL %d bytes to %d (nq=%d)",
$written, $self->{fd}, $need_queue);
$self->{write_buf_offset} = 0;
# this was our only write, so we can return immediately
# since we avoided incrementing the buffer size or
# putting it in the buffer. we also know there
# can't be anything else to write.
return 1 if $need_queue;
$self->{write_buf_size} -= $written;
shift @{$self->{write_buf}};
undef $bref;
next WRITE;
}
}
}
### METHOD: push_back_read( $buf )
### Push back I<buf> (a scalar or scalarref) into the read stream
sub push_back_read {
my Danga::Socket $self = shift;
my $buf = shift;
push @{$self->{read_push_back}}, ref $buf ? $buf : \$buf;
$PushBackSet{$self->{fd}} = $self;
}
### METHOD: read( $bytecount )
### Read at most I<bytecount> bytes from the underlying handle; returns scalar
### ref on read, or undef on connection closed.
sub read {
my Danga::Socket $self = shift;
my $bytes = shift;
my $buf;
my $sock = $self->{sock};
if (@{$self->{read_push_back}}) {
$buf = shift @{$self->{read_push_back}};
my $len = length($$buf);
if ($len <= $buf) {
unless (@{$self->{read_push_back}}) {
delete $PushBackSet{$self->{fd}};
}
return $buf;
} else {
# if the pushed back read is too big, we have to split it
my $overflow = substr($$buf, $bytes);
$buf = substr($$buf, 0, $bytes);
unshift @{$self->{read_push_back}}, \$overflow,
return \$buf;
}
}
my $res = sysread($sock, $buf, $bytes, 0);
DebugLevel >= 2 && $self->debugmsg("sysread = %d; \$! = %d", $res, $!);
if (! $res && $! != EWOULDBLOCK) {
# catches 0=conn closed or undef=error
DebugLevel >= 2 && $self->debugmsg("Fd \#%d read hit the end of the road.", $self->{fd});
return undef;
}
return \$buf;
}
### (VIRTUAL) METHOD: event_read()
### Readable event handler. Concrete deriviatives of Danga::Socket should
### provide an implementation of this. The default implementation will die if
### called.
sub event_read { die "Base class event_read called for $_[0]\n"; }
### (VIRTUAL) METHOD: event_err()
### Error event handler. Concrete deriviatives of Danga::Socket should
### provide an implementation of this. The default implementation will die if
### called.
sub event_err { die "Base class event_err called for $_[0]\n"; }
### (VIRTUAL) METHOD: event_hup()
### 'Hangup' event handler. Concrete deriviatives of Danga::Socket should
### provide an implementation of this. The default implementation will die if
### called.
sub event_hup { die "Base class event_hup called for $_[0]\n"; }
### METHOD: event_write()
### Writable event handler. Concrete deriviatives of Danga::Socket may wish to
### provide an implementation of this. The default implementation calls
### C<write()> with an C<undef>.
sub event_write {
my $self = shift;
$self->write(undef);
}
### METHOD: watch_read( $boolean )
### Turn 'readable' event notification on or off.
sub watch_read {
my Danga::Socket $self = shift;
return if $self->{closed};
my $val = shift;
my $event = $self->{event_watch};
$event &= ~POLLIN if ! $val;
$event |= POLLIN if $val;
# If it changed, set it
if ($event != $self->{event_watch}) {
if ($HaveKQueue) {
$KQueue->EV_SET($self->{fd}, IO::KQueue::EVFILT_READ(),
$val ? IO::KQueue::EV_ENABLE() : IO::KQueue::EV_DISABLE());
}
elsif ($HaveEpoll) {
epoll_ctl($Epoll, EPOLL_CTL_MOD, $self->{fd}, $event)
and print STDERR "couldn't modify epoll settings for $self->{fd} " .
"($self) from $self->{event_watch} -> $event\n";
}
$self->{event_watch} = $event;
}
}
### METHOD: watch_read( $boolean )
### Turn 'writable' event notification on or off.
sub watch_write {
my Danga::Socket $self = shift;
return if $self->{closed};
my $val = shift;
my $event = $self->{event_watch};
$event &= ~POLLOUT if ! $val;
$event |= POLLOUT if $val;
# If it changed, set it
if ($event != $self->{event_watch}) {
if ($HaveKQueue) {
$KQueue->EV_SET($self->{fd}, IO::KQueue::EVFILT_WRITE(),
$val ? IO::KQueue::EV_ENABLE() : IO::KQueue::EV_DISABLE());
}
elsif ($HaveEpoll) {
epoll_ctl($Epoll, EPOLL_CTL_MOD, $self->{fd}, $event)
and print STDERR "couldn't modify epoll settings for $self->{fd} " .
"($self) from $self->{event_watch} -> $event\n";
}
$self->{event_watch} = $event;
}
}
### METHOD: debugmsg( $format, @args )
### Print the debugging message specified by the C<sprintf>-style I<format> and
### I<args> if the object's C<debug_level> is greater than or equal to the given
### I<level>.
sub debugmsg {
my ( $self, $fmt, @args ) = @_;
confess "Not an object" unless ref $self;
chomp $fmt;
printf STDERR ">>> $fmt\n", @args;
}
### METHOD: peer_ip_string()
### Returns the string describing the peer's IP
sub peer_ip_string {
my Danga::Socket $self = shift;
return $self->{peer_ip} if defined $self->{peer_ip};
my $pn = getpeername($self->{sock}) or return undef;
my ($port, $iaddr) = Socket::sockaddr_in($pn);
my $r = Socket::inet_ntoa($iaddr);
$self->{peer_ip} = $r;
return $r;
}
### METHOD: peer_addr_string()
### Returns the string describing the peer for the socket which underlies this
### object in form "ip:port"
sub peer_addr_string {
my Danga::Socket $self = shift;
my $pn = getpeername($self->{sock}) or return undef;
my ($port, $iaddr) = Socket::sockaddr_in($pn);
return Socket::inet_ntoa($iaddr) . ":$port";
}
### METHOD: as_string()
### Returns a string describing this socket.
sub as_string {
my Danga::Socket $self = shift;
my $ret = ref($self) . ": " . ($self->{closed} ? "closed" : "open");
my $peer = $self->peer_addr_string;
if ($peer) {
$ret .= " to " . $self->peer_addr_string;
}
return $ret;
}
### CLASS METHOD: SetPostLoopCallback
### Sets post loop callback function. Pass a subref and it will be
### called every time the event loop finishes. Return 1 from the sub
### to make the loop continue, else it will exit. The function will
### be passed two parameters: \%DescriptorMap, \%OtherFds.
sub SetPostLoopCallback {
my ($class, $ref) = @_;
if(ref $class) {
my Danga::Socket $self = $class;
if( defined $ref && ref $ref eq 'CODE' ) {
$PLCMap{$self->{fd}} = $ref;
}
else {
delete $PLCMap{$self->{fd}};
}
}
else {
$PostLoopCallback = (defined $ref && ref $ref eq 'CODE') ? $ref : undef;
}
}
sub DESTROY {
my Danga::Socket $self = shift;
$self->close() if !$self->{closed};
}
#####################################################################
### U T I L I T Y F U N C T I O N S
#####################################################################
our $SYS_epoll_create = eval { &SYS_epoll_create } || 254; # linux-ix86 default
# epoll_create wrapper
# ARGS: (size)
sub epoll_create {
my $epfd = eval { syscall($SYS_epoll_create, $_[0]) };
return -1 if $@;
return $epfd;
}
# epoll_ctl wrapper
# ARGS: (epfd, op, fd, events)
our $SYS_epoll_ctl = eval { &SYS_epoll_ctl } || 255; # linux-ix86 default
sub epoll_ctl {
syscall($SYS_epoll_ctl, $_[0]+0, $_[1]+0, $_[2]+0, pack("LLL", $_[3], $_[2]));
}
# epoll_wait wrapper
# ARGS: (epfd, maxevents, timeout, arrayref)
# arrayref: values modified to be [$fd, $event]
our $epoll_wait_events;
our $epoll_wait_size = 0;
our $SYS_epoll_wait = eval { &SYS_epoll_wait } || 256; # linux-ix86 default
sub epoll_wait {
# resize our static buffer if requested size is bigger than we've ever done
if ($_[1] > $epoll_wait_size) {
$epoll_wait_size = $_[1];
$epoll_wait_events = pack("LLL") x $epoll_wait_size;
}
my $ct = syscall($SYS_epoll_wait, $_[0]+0, $epoll_wait_events, $_[1]+0, $_[2]+0);
for ($_ = 0; $_ < $ct; $_++) {
@{$_[3]->[$_]}[1,0] = unpack("LL", substr($epoll_wait_events, 12*$_, 8));
}
return $ct;
}
1;
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