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 {
   #
}

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_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;

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

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

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

sub connect_to {
   my ($self, $addresses) = @_;

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

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

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

   $self->{connect_w} = AE::timer 0, $interval * (0.9 + 0.1 * rand), sub {
      my $endpoint = pop @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 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 ($AnyEvent::MP::Kernel::GLOBAL) {
         AnyEvent::MP::Kernel::g_find ($self->{id});
      }
      return;
   }

   $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:	1.59
Committed:	Sat Mar 3 11:38:43 2012 UTC (12 years, 2 months ago) by root
Branch:	MAIN
Changes since 1.58:	+61 -3 lines
Log Message:	* empty log message *
#	Content
1	=head1 NAME
2
3	AnyEvent::MP::Node - represent a node
4
5	=head1 SYNOPSIS
6
7	use AnyEvent::MP::Node;
8
9	=head1 DESCRIPTION
10
11	This is an internal utility module, horrible to look at, so don't.
12
13	=cut
14
15	package AnyEvent::MP::Node;
16
17	use common::sense;
18
19	use AE ();
20	use AnyEvent::Util ();
21	use AnyEvent::Socket ();
22
23	use AnyEvent::MP::Transport ();
24
25	sub new {
26	my ($self, $id) = @_;
27
28	$self = bless { id => $id }, $self;
29
30	$self->init;
31	$self->transport_reset;
32
33	$self
34	}
35
36	sub init {
37	#
38	}
39
40	sub send {
41	&{ shift->{send} }
42	}
43
44	# nodes reachable via the network
45	package AnyEvent::MP::Node::Remote;
46
47	use base "AnyEvent::MP::Node";
48
49	# called at init time, mostly sets {send}
50	sub transport_reset {
51	my ($self) = @_;
52
53	delete $self->{transport};
54
55	Scalar::Util::weaken $self;
56
57	$self->{send} = sub {
58	push @{$self->{queue}}, shift;
59	$self->connect;
60	};
61	}
62
63	# called each time we fail to establish a connection,
64	# or the existing connection failed
65	sub transport_error {
66	my ($self, @reason) = @_;
67
68	my $no_transport = !$self->{transport};
69
70	delete $self->{connect_w};
71	delete $self->{connect_to};
72
73	delete $self->{queue};
74	$self->transport_reset;
75
76	if (my $mon = delete $self->{lmon}) {
77	$_->(@reason) for map @$_, values %$mon;
78	}
79
80	AnyEvent::MP::Kernel::_inject_nodeevent ($self, 0, @reason)
81	unless $no_transport;
82
83	# if we are here and are idle, we nuke ourselves
84	delete $AnyEvent::MP::Kernel::NODE{$self->{id}}
85	unless $self->{transport} \|\| $self->{connect_to};
86	}
87
88	# called after handshake was successful
89	sub transport_connect {
90	my ($self, $transport) = @_;
91
92	delete $self->{trial};
93
94	$self->transport_error (transport_error => $self->{id}, "switched connections")
95	if $self->{transport};
96
97	delete $self->{connect_w};
98	delete $self->{connect_to};
99
100	$self->{transport} = $transport;
101
102	my $transport_send = $transport->{send};
103
104	AnyEvent::MP::Kernel::_inject_nodeevent ($self, 1);
105
106	$self->{send} = $transport_send;
107
108	$transport_send->($_)
109	for @{ delete $self->{queue} \|\| [] };
110	}
111
112	sub connect {
113	my ($self) = @_;
114
115	return if $self->{transport};
116	return if $self->{connect_w};
117
118	Scalar::Util::weaken $self;
119
120	$self->{connect_to} \|\|= AE::timer $AnyEvent::MP::Kernel::CONFIG->{connect_interval}, 0, sub {
121	$self->transport_error (transport_error => $self->{id}, "unable to connect");
122	};
123
124	# maybe @$addresses?
125	my $addresses = $AnyEvent::MP::Kernel::GLOBAL_DB{"'l"}{$self->{id}};
126
127	if ($addresses) {
128	$self->connect_to ($addresses);
129	} else {
130	# on global nodes, all bets are off now - we either know the node, or we don't
131	unless ($AnyEvent::MP::Kernel::GLOBAL) {
132	AnyEvent::MP::Kernel::g_find ($self->{id});
133	}
134	}
135	}
136
137	sub connect_to {
138	my ($self, $addresses) = @_;
139
140	return if $self->{transport};
141	return if $self->{connect_w};
142
143	return unless @$addresses;
144
145	$AnyEvent::MP::Kernel::WARN->(9, "connecting to $self->{id} with [@$addresses]");
146
147	my $monitor = $AnyEvent::MP::Kernel::CONFIG->{monitor_timeout};
148	my $interval = $AnyEvent::MP::Kernel::CONFIG->{connect_interval};
149
150	$interval = ($monitor - $interval) / @$addresses
151	if ($monitor - $interval) / @$addresses < $interval;
152
153	$interval = 0.4 if $interval < 0.4;
154
155	my @endpoints = reverse @$addresses;
156
157	$self->{connect_w} = AE::timer 0, $interval * (0.9 + 0.1 * rand), sub {
158	my $endpoint = pop @endpoints;
159
160	$AnyEvent::MP::Kernel::WARN->(9, "connecting to $self->{id} at $endpoint");
161
162	$self->{trial}{$endpoint} \|\|= do {
163	my ($host, $port) = AnyEvent::Socket::parse_hostport $endpoint
164	or return $AnyEvent::MP::Kernel::WARN->(1, "$self->{id}: not a resolved node reference.");
165
166	AnyEvent::MP::Transport::mp_connect
167	$host, $port,
168	sub { delete $self->{trial}{$endpoint} },
169	};
170	};
171	}
172
173	sub connect {
174	my ($self) = @_;
175
176	return if $self->{transport};
177	return if $self->{connect_w};
178
179	Scalar::Util::weaken $self;
180
181	my $monitor = $AnyEvent::MP::Kernel::CONFIG->{monitor_timeout};
182
183	$self->{connect_to} \|\|= AE::timer $monitor, 0, sub {
184	$self->transport_error (transport_error => $self->{id}, "unable to connect");
185	};
186
187	# maybe @$addresses?
188	my @addresses = @{ $AnyEvent::MP::Kernel::GLOBAL_DB{"'l"}{$self->{id}} };
189
190	unless (@addresses) {
191	# on global nodes, all bets are off now - we either know the node, or we don't
192	unless ($AnyEvent::MP::Kernel::GLOBAL) {
193	AnyEvent::MP::Kernel::g_find ($self->{id});
194	}
195	return;
196	}
197
198	$AnyEvent::MP::Kernel::WARN->(9, "connecting to $self->{id} with [@addresses]");
199
200	my $interval = $AnyEvent::MP::Kernel::CONFIG->{connect_interval};
201
202	$interval = ($monitor - $interval) / @addresses
203	if ($monitor - $interval) / @addresses < $interval;
204
205	$interval = 0.4 if $interval < 0.4;
206
207	my @endpoints;
208
209	$self->{connect_w} = AE::timer 0, $interval * (0.9 + 0.1 * rand), sub {
210	@endpoints = @addresses
211	unless @endpoints;
212
213	my $endpoint = shift @endpoints;
214
215	$AnyEvent::MP::Kernel::WARN->(9, "connecting to $self->{id} at $endpoint");
216
217	$self->{trial}{$endpoint} \|\|= do {
218	my ($host, $port) = AnyEvent::Socket::parse_hostport $endpoint
219	or return $AnyEvent::MP::Kernel::WARN->(1, "$self->{id}: not a resolved node reference.");
220
221	AnyEvent::MP::Transport::mp_connect
222	$host, $port,
223	sub { delete $self->{trial}{$endpoint} },
224	};
225	};
226	}
227
228	sub kill {
229	my ($self, $port, @reason) = @_;
230
231	$self->{send} (["", kil => $port, @reason]);
232	}
233
234	sub monitor {
235	my ($self, $portid, $cb) = @_;
236
237	my $list = $self->{lmon}{$portid} \|\|= [];
238
239	$self->send (["", mon1 => $portid])
240	unless @$list \|\| !length $portid;
241
242	push @$list, $cb;
243	}
244
245	sub unmonitor {
246	my ($self, $portid, $cb) = @_;
247
248	my $list = $self->{lmon}{$portid}
249	or return;
250
251	@$list = grep $_ != $cb, @$list;
252
253	unless (@$list) {
254	$self->send (["", mon0 => $portid]);
255	delete $self->{monitor}{$portid};
256	}
257	}
258
259	package AnyEvent::MP::Node::Self;
260
261	use base "AnyEvent::MP::Node";
262
263	sub connect {
264	# we are trivially connected
265	}
266
267	# delay every so often to avoid recursion, also used to delay after spawn
268	our $DELAY = -50;
269	our @DELAY;
270	our $DELAY_W;
271
272	sub _send_delayed {
273	local $AnyEvent::MP::Kernel::SRCNODE = $AnyEvent::MP::Kernel::NODE{""};
274	(shift @DELAY)->()
275	while @DELAY;
276	undef $DELAY_W;
277	$DELAY = -50;
278	}
279
280	sub transport_reset {
281	my ($self) = @_;
282
283	Scalar::Util::weaken $self;
284
285	$self->{send} = sub {
286	if ($DELAY++ >= 0) {
287	my $msg = $_[0];
288	push @DELAY, sub { AnyEvent::MP::Kernel::_inject (@$msg) };
289	$DELAY_W \|\|= AE::timer 0, 0, \&_send_delayed;
290	return;
291	}
292
293	local $AnyEvent::MP::Kernel::SRCNODE = $self;
294	AnyEvent::MP::Kernel::_inject (@{ $_[0] });
295	};
296	}
297
298	sub transport_connect {
299	my ($self, $tp) = @_;
300
301	$AnyEvent::MP::Kernel::WARN->(9, "I refuse to talk to myself ($tp->{peerhost}:$tp->{peerport})");
302	}
303
304	sub kill {
305	my (undef, @args) = @_;
306
307	# we _always_ delay kil's, to avoid calling mon callbacks
308	# from anything but the event loop context.
309	$DELAY = 1;
310	push @DELAY, sub { AnyEvent::MP::Kernel::_kill (@args) };
311	$DELAY_W \|\|= AE::timer 0, 0, \&_send_delayed;
312	}
313
314	sub monitor {
315	# maybe always delay, too?
316	if ($DELAY_W) {
317	my @args = @_;
318	push @DELAY, sub { AnyEvent::MP::Kernel::_monitor (@args) };
319	return;
320	}
321	&AnyEvent::MP::Kernel::_monitor;
322	}
323
324	sub unmonitor {
325	# no need to always delay
326	if ($DELAY_W) {
327	my @args = @_;
328	push @DELAY, sub { AnyEvent::MP::Kernel::_unmonitor (@args) };
329	return;
330	}
331
332	&AnyEvent::MP::Kernel::_unmonitor;
333	}
334
335	=head1 SEE ALSO
336
337	L<AnyEvent::MP>.
338
339	=head1 AUTHOR
340
341	Marc Lehmann <schmorp@schmorp.de>
342	http://home.schmorp.de/
343
344	=cut
345
346	1
347