AnyEvent-MP/MP/Node.pm

=head1 NAME

AnyEvent::MP::Node - represent a node

=head1 SYNOPSIS

   use AnyEvent::MP::Node;

=head1 DESCRIPTION

This is an internal utility module, horrible to look at, so don't.

=cut

package AnyEvent::MP::Node;

use common::sense;

use AE ();
use AnyEvent::Util ();
use AnyEvent::Socket ();

use AnyEvent::MP::Transport ();

sub new {
   my ($self, $id) = @_;

   $self = bless { id => $id }, $self;

   $self->init;
   $self->transport_reset;

   $self
}

sub init {
   #
}

#d# only needed for bad global code at the moment
sub transport_error {
}

sub send {
   &{ shift->{send} }
}

# nodes reachable via the network
package AnyEvent::MP::Node::Remote;

use base "AnyEvent::MP::Node";

# called at init time, mostly sets {send}
sub transport_reset {
   my ($self) = @_;

   delete $self->{transport};

   Scalar::Util::weaken $self;

   $self->{send} = sub {
      push @{$self->{queue}}, shift;
      $self->connect;
   };
}

# called each time we fail to establish a connection,
# or the existing connection failed
sub transport_error {
   my ($self, @reason) = @_;

   my $no_transport = !$self->{transport};

   delete $self->{connect_w};
   delete $self->{connect_to};

   delete $self->{queue};
   $self->transport_reset;

   if (my $mon = delete $self->{lmon}) {
      $_->(@reason) for map @$_, values %$mon;
   }

   AnyEvent::MP::Kernel::_inject_nodeevent ($self, 0, @reason)
      unless $no_transport;

   # if we are here and are idle, we nuke ourselves
   delete $AnyEvent::MP::Kernel::NODE{$self->{id}}
      unless $self->{transport} || $self->{connect_to};
}

# called after handshake was successful
sub transport_connect {
   my ($self, $transport) = @_;

   delete $self->{trial};

   $self->transport_error (transport_error => $self->{id}, "switched connections")
      if $self->{transport};

   delete $self->{connect_addr};
   delete $self->{connect_w};
   delete $self->{connect_to};

   $self->{transport} = $transport;

   my $transport_send = $transport->{send};

   AnyEvent::MP::Kernel::_inject_nodeevent ($self, 1);

   $self->{send} = $transport_send;

   $transport_send->($_)
      for @{ delete $self->{queue} || [] };
}

sub connect {
   my ($self) = @_;

   return if $self->{transport};
   return if $self->{connect_w};

   Scalar::Util::weaken $self;

   my $monitor = $AnyEvent::MP::Kernel::CONFIG->{monitor_timeout};

   $self->{connect_to} ||= AE::timer $monitor, 0, sub {
      $self->transport_error (transport_error => $self->{id}, "unable to connect");
   };

   # maybe @$addresses?
   my @addresses = @{ $AnyEvent::MP::Kernel::GLOBAL_DB{"'l"}{$self->{id}} };

   unless (@addresses) {
      # on global nodes, all bets are off now - we either know the node, or we don't
      unless ($AnyEvent::MP::Kernel::GLOBAL) {
         $self->{connect_w} = AnyEvent::MP::Kernel::global_req (g_find => $self->{id});
      }
      return;
   }

   $self->{connect_addr} = \@addresses; # a bit weird, but efficient

   $AnyEvent::MP::Kernel::WARN->(9, "connecting to $self->{id} with [@addresses]");

   my $interval = $AnyEvent::MP::Kernel::CONFIG->{connect_interval};

   $interval = ($monitor - $interval) / @addresses
      if ($monitor - $interval) / @addresses < $interval;

   $interval = 0.4 if $interval < 0.4;

   my @endpoints;

   $self->{connect_w} = AE::timer 0, $interval * (0.9 + 0.1 * rand), sub {
      @endpoints = @addresses
         unless @endpoints;

      my $endpoint = shift @endpoints;

      $AnyEvent::MP::Kernel::WARN->(9, "connecting to $self->{id} at $endpoint");

      $self->{trial}{$endpoint} ||= do {
         my ($host, $port) = AnyEvent::Socket::parse_hostport $endpoint
            or return $AnyEvent::MP::Kernel::WARN->(1, "$self->{id}: not a resolved node reference.");

         AnyEvent::MP::Transport::mp_connect
            $host, $port,
            sub { delete $self->{trial}{$endpoint} },
      };
   };
}

sub kill {
   my ($self, $port, @reason) = @_;

   $self->{send} (["", kil => $port, @reason]);
}

sub monitor {
   my ($self, $portid, $cb) = @_;

   my $list = $self->{lmon}{$portid} ||= [];

   $self->send (["", mon1 => $portid])
      unless @$list || !length $portid;

   push @$list, $cb;
}

sub unmonitor {
   my ($self, $portid, $cb) = @_;

   my $list = $self->{lmon}{$portid}
      or return;

   @$list = grep $_ != $cb, @$list;

   unless (@$list) {
      $self->send (["", mon0 => $portid]);
      delete $self->{monitor}{$portid};
   }
}

package AnyEvent::MP::Node::Self;

use base "AnyEvent::MP::Node";

sub connect {
   # we are trivially connected
}

# delay every so often to avoid recursion, also used to delay after spawn
our $DELAY = -50;
our @DELAY;
our $DELAY_W;

sub _send_delayed {
   local $AnyEvent::MP::Kernel::SRCNODE = $AnyEvent::MP::Kernel::NODE{""};
   (shift @DELAY)->()
      while @DELAY;
   undef $DELAY_W;
   $DELAY = -50;
}

sub transport_reset {
   my ($self) = @_;

   Scalar::Util::weaken $self;

   $self->{send} = sub {
      if ($DELAY++ >= 0) {
         my $msg = $_[0];
         push @DELAY, sub { AnyEvent::MP::Kernel::_inject (@$msg) };
         $DELAY_W ||= AE::timer 0, 0, \&_send_delayed;
         return;
      }

      local $AnyEvent::MP::Kernel::SRCNODE = $self;
      AnyEvent::MP::Kernel::_inject (@{ $_[0] });
   };
}

sub transport_connect {
   my ($self, $tp) = @_;

   $AnyEvent::MP::Kernel::WARN->(9, "I refuse to talk to myself ($tp->{peerhost}:$tp->{peerport})");
}

sub kill {
   my (undef, @args) = @_;

   # we _always_ delay kil's, to avoid calling mon callbacks
   # from anything but the event loop context.
   $DELAY = 1;
   push @DELAY, sub { AnyEvent::MP::Kernel::_kill (@args) };
   $DELAY_W ||= AE::timer 0, 0, \&_send_delayed;
}

sub monitor {
   # maybe always delay, too?
   if ($DELAY_W) {
      my @args = @_;
      push @DELAY, sub { AnyEvent::MP::Kernel::_monitor (@args) };
      return;
   }
   &AnyEvent::MP::Kernel::_monitor;
}

sub unmonitor {
   # no need to always delay
   if ($DELAY_W) {
      my @args = @_;
      push @DELAY, sub { AnyEvent::MP::Kernel::_unmonitor (@args) };
      return;
   }

   &AnyEvent::MP::Kernel::_unmonitor;
}

=head1 SEE ALSO

L<AnyEvent::MP>.

=head1 AUTHOR

 Marc Lehmann <schmorp@schmorp.de>
 http://home.schmorp.de/

=cut

1

Revision:	1.56
Committed:	Thu Mar 1 18:11:56 2012 UTC (12 years, 4 months ago) by root
Branch:	MAIN
Changes since 1.55:	+6 -16 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	=head1 NAME
2
3	root	1.31	AnyEvent::MP::Node - represent a node
4	root	1.1
5			=head1 SYNOPSIS
6
7			use AnyEvent::MP::Node;
8
9			=head1 DESCRIPTION
10
11	root	1.31	This is an internal utility module, horrible to look at, so don't.
12
13	root	1.1	=cut
14
15			package AnyEvent::MP::Node;
16
17			use common::sense;
18
19			use AE ();
20	root	1.6	use AnyEvent::Util ();
21	root	1.1	use AnyEvent::Socket ();
22
23			use AnyEvent::MP::Transport ();
24
25			sub new {
26	root	1.28	my ($self, $id) = @_;
27	root	1.1
28	root	1.28	$self = bless { id => $id }, $self;
29	root	1.1
30	root	1.27	$self->init;
31	root	1.18	$self->transport_reset;
32	root	1.1
33	root	1.18	$self
34			}
35	root	1.1
36	root	1.27	sub init {
37			#
38			}
39
40	root	1.56	#d# only needed for bad global code at the moment
41			sub transport_error {
42			}
43
44	root	1.1	sub send {
45	root	1.19	&{ shift->{send} }
46	root	1.1	}
47
48	root	1.27	# nodes reachable via the network
49	root	1.53	package AnyEvent::MP::Node::Remote;
50	root	1.7
51	root	1.18	use base "AnyEvent::MP::Node";
52	root	1.7
53	root	1.18	# called at init time, mostly sets {send}
54			sub transport_reset {
55			my ($self) = @_;
56	root	1.6
57	root	1.18	delete $self->{transport};
58	root	1.6
59	root	1.19	Scalar::Util::weaken $self;
60
61	root	1.18	$self->{send} = sub {
62	root	1.19	push @{$self->{queue}}, shift;
63			$self->connect;
64	root	1.18	};
65	root	1.6	}
66
67	root	1.32	# called each time we fail to establish a connection,
68			# or the existing connection failed
69	root	1.18	sub transport_error {
70			my ($self, @reason) = @_;
71	root	1.6
72	root	1.21	my $no_transport = !$self->{transport};
73
74			delete $self->{connect_w};
75			delete $self->{connect_to};
76	root	1.20
77	root	1.18	delete $self->{queue};
78			$self->transport_reset;
79	root	1.6
80	root	1.18	if (my $mon = delete $self->{lmon}) {
81			$_->(@reason) for map @$_, values %$mon;
82	root	1.6	}
83	root	1.30
84			AnyEvent::MP::Kernel::_inject_nodeevent ($self, 0, @reason)
85			unless $no_transport;
86	root	1.32
87			# if we are here and are idle, we nuke ourselves
88			delete $AnyEvent::MP::Kernel::NODE{$self->{id}}
89			unless $self->{transport} \|\| $self->{connect_to};
90	root	1.6	}
91
92	root	1.18	# called after handshake was successful
93			sub transport_connect {
94	root	1.1	my ($self, $transport) = @_;
95
96	root	1.28	delete $self->{trial};
97
98	root	1.51	$self->transport_error (transport_error => $self->{id}, "switched connections")
99	root	1.6	if $self->{transport};
100
101	root	1.41	delete $self->{connect_addr};
102	root	1.18	delete $self->{connect_w};
103			delete $self->{connect_to};
104	root	1.8
105	root	1.15	$self->{transport} = $transport;
106	root	1.1
107	root	1.52	my $transport_send = $transport->{send};
108	root	1.19
109	root	1.46	AnyEvent::MP::Kernel::_inject_nodeevent ($self, 1);
110
111	root	1.52	$self->{send} = $transport_send;
112	root	1.18
113	root	1.52	$transport_send->($_)
114	root	1.1	for @{ delete $self->{queue} \|\| [] };
115			}
116
117	root	1.18	sub connect {
118	root	1.53	my ($self) = @_;
119	root	1.18
120	root	1.23	return if $self->{transport};
121	root	1.55	return if $self->{connect_w};
122	root	1.23
123	root	1.18	Scalar::Util::weaken $self;
124	root	1.8
125	root	1.36	my $monitor = $AnyEvent::MP::Kernel::CONFIG->{monitor_timeout};
126	root	1.33
127			$self->{connect_to} \|\|= AE::timer $monitor, 0, sub {
128			$self->transport_error (transport_error => $self->{id}, "unable to connect");
129			};
130	root	1.1
131	root	1.53	# maybe @$addresses?
132	root	1.56	my @addresses = @{ $AnyEvent::MP::Kernel::GLOBAL_DB{"'l"}{$self->{id}} };
133	root	1.53
134			unless (@addresses) {
135	root	1.55	# on global nodes, all bets are off now - we either know the node, or we don't
136	root	1.53	unless ($AnyEvent::MP::Kernel::GLOBAL) {
137	root	1.56	$self->{connect_w} = AnyEvent::MP::Kernel::global_req (g_find => $self->{id});
138	root	1.53	}
139	root	1.41	return;
140			}
141
142			$self->{connect_addr} = \@addresses; # a bit weird, but efficient
143	root	1.29
144	root	1.28	$AnyEvent::MP::Kernel::WARN->(9, "connecting to $self->{id} with [@addresses]");
145
146	root	1.36	my $interval = $AnyEvent::MP::Kernel::CONFIG->{connect_interval};
147	root	1.33
148			$interval = ($monitor - $interval) / @addresses
149			if ($monitor - $interval) / @addresses < $interval;
150
151			$interval = 0.4 if $interval < 0.4;
152
153			my @endpoints;
154
155	root	1.55	$self->{connect_w} = AE::timer 0, $interval * (0.9 + 0.1 * rand), sub {
156	root	1.33	@endpoints = @addresses
157			unless @endpoints;
158	root	1.18
159	root	1.33	my $endpoint = shift @endpoints;
160
161			$AnyEvent::MP::Kernel::WARN->(9, "connecting to $self->{id} at $endpoint");
162
163			$self->{trial}{$endpoint} \|\|= do {
164			my ($host, $port) = AnyEvent::Socket::parse_hostport $endpoint
165			or return $AnyEvent::MP::Kernel::WARN->(1, "$self->{id}: not a resolved node reference.");
166
167			AnyEvent::MP::Transport::mp_connect
168			$host, $port,
169			sub { delete $self->{trial}{$endpoint} },
170			};
171			};
172	root	1.8	}
173
174	root	1.18	sub kill {
175			my ($self, $port, @reason) = @_;
176	root	1.4
177	root	1.53	$self->{send} (["", kil => $port, @reason]);
178	root	1.1	}
179
180	root	1.18	sub monitor {
181			my ($self, $portid, $cb) = @_;
182
183			my $list = $self->{lmon}{$portid} \|\|= [];
184
185			$self->send (["", mon1 => $portid])
186	root	1.24	unless @$list \|\| !length $portid;
187	root	1.1
188	root	1.18	push @$list, $cb;
189			}
190	root	1.1
191	root	1.18	sub unmonitor {
192			my ($self, $portid, $cb) = @_;
193	root	1.1
194	root	1.18	my $list = $self->{lmon}{$portid}
195			or return;
196	root	1.1
197	root	1.18	@$list = grep $_ != $cb, @$list;
198	root	1.1
199	root	1.18	unless (@$list) {
200			$self->send (["", mon0 => $portid]);
201			delete $self->{monitor}{$portid};
202	root	1.1	}
203	root	1.18	}
204	root	1.1
205			package AnyEvent::MP::Node::Self;
206
207			use base "AnyEvent::MP::Node";
208
209	root	1.20	sub connect {
210			# we are trivially connected
211			}
212
213	root	1.38	# delay every so often to avoid recursion, also used to delay after spawn
214	root	1.43	our $DELAY = -50;
215	root	1.38	our @DELAY;
216			our $DELAY_W;
217
218			sub _send_delayed {
219			local $AnyEvent::MP::Kernel::SRCNODE = $AnyEvent::MP::Kernel::NODE{""};
220	root	1.39	(shift @DELAY)->()
221	root	1.38	while @DELAY;
222			undef $DELAY_W;
223			$DELAY = -50;
224			}
225
226	root	1.18	sub transport_reset {
227			my ($self) = @_;
228	root	1.1
229	root	1.19	Scalar::Util::weaken $self;
230
231	root	1.18	$self->{send} = sub {
232	root	1.38	if ($DELAY++ >= 0) {
233	root	1.39	my $msg = $_[0];
234			push @DELAY, sub { AnyEvent::MP::Kernel::_inject (@$msg) };
235	root	1.38	$DELAY_W \|\|= AE::timer 0, 0, \&_send_delayed;
236	root	1.40	return;
237	root	1.38	}
238	root	1.40
239			local $AnyEvent::MP::Kernel::SRCNODE = $self;
240			AnyEvent::MP::Kernel::_inject (@{ $_[0] });
241	root	1.18	};
242	root	1.6	}
243
244	root	1.28	sub transport_connect {
245			my ($self, $tp) = @_;
246
247			$AnyEvent::MP::Kernel::WARN->(9, "I refuse to talk to myself ($tp->{peerhost}:$tp->{peerport})");
248			}
249
250	root	1.7	sub kill {
251	root	1.49	my (undef, @args) = @_;
252	root	1.7
253	root	1.44	# we _always_ delay kil's, to avoid calling mon callbacks
254			# from anything but the event loop context.
255			$DELAY = 1;
256	root	1.48	push @DELAY, sub { AnyEvent::MP::Kernel::_kill (@args) };
257	root	1.45	$DELAY_W \|\|= AE::timer 0, 0, \&_send_delayed;
258	root	1.7	}
259
260	root	1.6	sub monitor {
261	root	1.50	# maybe always delay, too?
262	root	1.49	if ($DELAY_W) {
263			my @args = @_;
264			push @DELAY, sub { AnyEvent::MP::Kernel::_monitor (@args) };
265			return;
266			}
267			&AnyEvent::MP::Kernel::_monitor;
268	root	1.6	}
269
270			sub unmonitor {
271	root	1.50	# no need to always delay
272	root	1.49	if ($DELAY_W) {
273			my @args = @_;
274			push @DELAY, sub { AnyEvent::MP::Kernel::_unmonitor (@args) };
275			return;
276			}
277	root	1.39
278	root	1.49	&AnyEvent::MP::Kernel::_unmonitor;
279	root	1.1	}
280
281			=head1 SEE ALSO
282
283	root	1.17	L<AnyEvent::MP>.
284	root	1.1
285			=head1 AUTHOR
286
287			Marc Lehmann <schmorp@schmorp.de>
288			http://home.schmorp.de/
289
290			=cut
291
292			1
293