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 ($AnyEvent::MP::Kernel::GLOBAL) {
         AnyEvent::MP::Kernel::g_find ($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:	1.57
Committed:	Thu Mar 1 18:31:42 2012 UTC (12 years, 3 months ago) by root
Branch:	MAIN
Changes since 1.56:	+1 -1 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	$self
34	}
35
36	sub init {
37	#
38	}
39
40	#d# only needed for bad global code at the moment
41	sub transport_error {
42	}
43
44	sub send {
45	&{ shift->{send} }
46	}
47
48	# nodes reachable via the network
49	package AnyEvent::MP::Node::Remote;
50
51	use base "AnyEvent::MP::Node";
52
53	# called at init time, mostly sets {send}
54	sub transport_reset {
55	my ($self) = @_;
56
57	delete $self->{transport};
58
59	Scalar::Util::weaken $self;
60
61	$self->{send} = sub {
62	push @{$self->{queue}}, shift;
63	$self->connect;
64	};
65	}
66
67	# called each time we fail to establish a connection,
68	# or the existing connection failed
69	sub transport_error {
70	my ($self, @reason) = @_;
71
72	my $no_transport = !$self->{transport};
73
74	delete $self->{connect_w};
75	delete $self->{connect_to};
76
77	delete $self->{queue};
78	$self->transport_reset;
79
80	if (my $mon = delete $self->{lmon}) {
81	$_->(@reason) for map @$_, values %$mon;
82	}
83
84	AnyEvent::MP::Kernel::_inject_nodeevent ($self, 0, @reason)
85	unless $no_transport;
86
87	# if we are here and are idle, we nuke ourselves
88	delete $AnyEvent::MP::Kernel::NODE{$self->{id}}
89	unless $self->{transport} \|\| $self->{connect_to};
90	}
91
92	# called after handshake was successful
93	sub transport_connect {
94	my ($self, $transport) = @_;
95
96	delete $self->{trial};
97
98	$self->transport_error (transport_error => $self->{id}, "switched connections")
99	if $self->{transport};
100
101	delete $self->{connect_addr};
102	delete $self->{connect_w};
103	delete $self->{connect_to};
104
105	$self->{transport} = $transport;
106
107	my $transport_send = $transport->{send};
108
109	AnyEvent::MP::Kernel::_inject_nodeevent ($self, 1);
110
111	$self->{send} = $transport_send;
112
113	$transport_send->($_)
114	for @{ delete $self->{queue} \|\| [] };
115	}
116
117	sub connect {
118	my ($self) = @_;
119
120	return if $self->{transport};
121	return if $self->{connect_w};
122
123	Scalar::Util::weaken $self;
124
125	my $monitor = $AnyEvent::MP::Kernel::CONFIG->{monitor_timeout};
126
127	$self->{connect_to} \|\|= AE::timer $monitor, 0, sub {
128	$self->transport_error (transport_error => $self->{id}, "unable to connect");
129	};
130
131	# maybe @$addresses?
132	my @addresses = @{ $AnyEvent::MP::Kernel::GLOBAL_DB{"'l"}{$self->{id}} };
133
134	unless (@addresses) {
135	# on global nodes, all bets are off now - we either know the node, or we don't
136	unless ($AnyEvent::MP::Kernel::GLOBAL) {
137	AnyEvent::MP::Kernel::g_find ($self->{id});
138	}
139	return;
140	}
141
142	$self->{connect_addr} = \@addresses; # a bit weird, but efficient
143
144	$AnyEvent::MP::Kernel::WARN->(9, "connecting to $self->{id} with [@addresses]");
145
146	my $interval = $AnyEvent::MP::Kernel::CONFIG->{connect_interval};
147
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	$self->{connect_w} = AE::timer 0, $interval * (0.9 + 0.1 * rand), sub {
156	@endpoints = @addresses
157	unless @endpoints;
158
159	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	}
173
174	sub kill {
175	my ($self, $port, @reason) = @_;
176
177	$self->{send} (["", kil => $port, @reason]);
178	}
179
180	sub monitor {
181	my ($self, $portid, $cb) = @_;
182
183	my $list = $self->{lmon}{$portid} \|\|= [];
184
185	$self->send (["", mon1 => $portid])
186	unless @$list \|\| !length $portid;
187
188	push @$list, $cb;
189	}
190
191	sub unmonitor {
192	my ($self, $portid, $cb) = @_;
193
194	my $list = $self->{lmon}{$portid}
195	or return;
196
197	@$list = grep $_ != $cb, @$list;
198
199	unless (@$list) {
200	$self->send (["", mon0 => $portid]);
201	delete $self->{monitor}{$portid};
202	}
203	}
204
205	package AnyEvent::MP::Node::Self;
206
207	use base "AnyEvent::MP::Node";
208
209	sub connect {
210	# we are trivially connected
211	}
212
213	# delay every so often to avoid recursion, also used to delay after spawn
214	our $DELAY = -50;
215	our @DELAY;
216	our $DELAY_W;
217
218	sub _send_delayed {
219	local $AnyEvent::MP::Kernel::SRCNODE = $AnyEvent::MP::Kernel::NODE{""};
220	(shift @DELAY)->()
221	while @DELAY;
222	undef $DELAY_W;
223	$DELAY = -50;
224	}
225
226	sub transport_reset {
227	my ($self) = @_;
228
229	Scalar::Util::weaken $self;
230
231	$self->{send} = sub {
232	if ($DELAY++ >= 0) {
233	my $msg = $_[0];
234	push @DELAY, sub { AnyEvent::MP::Kernel::_inject (@$msg) };
235	$DELAY_W \|\|= AE::timer 0, 0, \&_send_delayed;
236	return;
237	}
238
239	local $AnyEvent::MP::Kernel::SRCNODE = $self;
240	AnyEvent::MP::Kernel::_inject (@{ $_[0] });
241	};
242	}
243
244	sub transport_connect {
245	my ($self, $tp) = @_;
246
247	$AnyEvent::MP::Kernel::WARN->(9, "I refuse to talk to myself ($tp->{peerhost}:$tp->{peerport})");
248	}
249
250	sub kill {
251	my (undef, @args) = @_;
252
253	# we _always_ delay kil's, to avoid calling mon callbacks
254	# from anything but the event loop context.
255	$DELAY = 1;
256	push @DELAY, sub { AnyEvent::MP::Kernel::_kill (@args) };
257	$DELAY_W \|\|= AE::timer 0, 0, \&_send_delayed;
258	}
259
260	sub monitor {
261	# maybe always delay, too?
262	if ($DELAY_W) {
263	my @args = @_;
264	push @DELAY, sub { AnyEvent::MP::Kernel::_monitor (@args) };
265	return;
266	}
267	&AnyEvent::MP::Kernel::_monitor;
268	}
269
270	sub unmonitor {
271	# no need to always delay
272	if ($DELAY_W) {
273	my @args = @_;
274	push @DELAY, sub { AnyEvent::MP::Kernel::_unmonitor (@args) };
275	return;
276	}
277
278	&AnyEvent::MP::Kernel::_unmonitor;
279	}
280
281	=head1 SEE ALSO
282
283	L<AnyEvent::MP>.
284
285	=head1 AUTHOR
286
287	Marc Lehmann <schmorp@schmorp.de>
288	http://home.schmorp.de/
289
290	=cut
291
292	1
293