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; # base class for nodes

use common::sense;

use AnyEvent ();
use AnyEvent::Socket ();

use AnyEvent::MP::Transport ();

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

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

   # register
   $AnyEvent::MP::Kernel::NODE{$id} = $self;

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

   $self
}

sub DESTROY {
   # unregister
   delete $AnyEvent::MP::Kernel::NODE{$_[0]{id}};
}

sub init {
   #
}

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

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

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;

   # we weaken the node reference, so it can go away if unused
   Scalar::Util::weaken $AnyEvent::MP::Kernel::NODE{$self->{id}}
      unless $self->{connect_to};

   AE::log 9 => "@reason";
}

# 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};

   # we unweaken the node reference, in case it was weakened before
   $AnyEvent::MP::Kernel::NODE{$self->{id}}
      = $AnyEvent::MP::Kernel::NODE{$self->{id}};

   Scalar::Util::weaken $self;

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

   # 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
      if ($AnyEvent::MP::Kernel::GLOBAL) {
         $self->transport_error (transport_error => $self->{id}, "no known address");
      } else {
         AnyEvent::MP::Kernel::g_find ($self->{id});
      }
   }
}

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

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

   unless (@$addresses) {
      $self->transport_error (transport_error => $self->{id}, "no known address");
      return;
   }
   
   AE::log 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
         or return;

      AE::log 9 => "connecting to $self->{id} at $endpoint";

      $self->{trial}{$endpoint} ||= do {
         my ($host, $port) = AnyEvent::Socket::parse_hostport $endpoint
            or return AE::log critical => "$self->{id}: '$endpoint' is 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} (["", kil1 => $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; # the local node

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;

our $send_delayed = sub {
   $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 = $AnyEvent::MP::Kernel::NODE;
      AnyEvent::MP::Kernel::_inject (@{ $_[0] });
   };
}

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

   AE::log 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:	1.69
Committed:	Sun Aug 28 14:49:44 2016 UTC (7 years, 9 months ago) by root
Branch:	MAIN
CVS Tags:	rel-2_02, rel-2_01, rel-2_0, HEAD
Changes since 1.68:	+1 -1 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	root	1.64	package AnyEvent::MP::Node; # base class for nodes
16	root	1.1
17			use common::sense;
18
19	root	1.63	use AnyEvent ();
20	root	1.1	use AnyEvent::Socket ();
21
22			use AnyEvent::MP::Transport ();
23
24			sub new {
25	root	1.28	my ($self, $id) = @_;
26	root	1.1
27	root	1.28	$self = bless { id => $id }, $self;
28	root	1.1
29	root	1.66	# register
30			$AnyEvent::MP::Kernel::NODE{$id} = $self;
31
32	root	1.27	$self->init;
33	root	1.18	$self->transport_reset;
34	root	1.1
35	root	1.18	$self
36			}
37	root	1.1
38	root	1.66	sub DESTROY {
39			# unregister
40			delete $AnyEvent::MP::Kernel::NODE{$_[0]{id}};
41			}
42
43	root	1.27	sub init {
44			#
45			}
46
47	root	1.1	sub send {
48	root	1.19	&{ shift->{send} }
49	root	1.1	}
50
51	root	1.27	# nodes reachable via the network
52	root	1.64	package AnyEvent::MP::Node::Remote; # a remote node
53	root	1.7
54	root	1.18	use base "AnyEvent::MP::Node";
55	root	1.7
56	root	1.18	# called at init time, mostly sets {send}
57			sub transport_reset {
58			my ($self) = @_;
59	root	1.6
60	root	1.18	delete $self->{transport};
61	root	1.6
62	root	1.19	Scalar::Util::weaken $self;
63
64	root	1.18	$self->{send} = sub {
65	root	1.19	push @{$self->{queue}}, shift;
66			$self->connect;
67	root	1.18	};
68	root	1.6	}
69
70	root	1.32	# called each time we fail to establish a connection,
71			# or the existing connection failed
72	root	1.18	sub transport_error {
73			my ($self, @reason) = @_;
74	root	1.6
75	root	1.21	my $no_transport = !$self->{transport};
76
77			delete $self->{connect_w};
78			delete $self->{connect_to};
79	root	1.20
80	root	1.18	delete $self->{queue};
81			$self->transport_reset;
82	root	1.6
83	root	1.18	if (my $mon = delete $self->{lmon}) {
84			$_->(@reason) for map @$_, values %$mon;
85	root	1.6	}
86	root	1.30
87			AnyEvent::MP::Kernel::_inject_nodeevent ($self, 0, @reason)
88			unless $no_transport;
89	root	1.32
90	root	1.66	# we weaken the node reference, so it can go away if unused
91			Scalar::Util::weaken $AnyEvent::MP::Kernel::NODE{$self->{id}}
92			unless $self->{connect_to};
93
94			AE::log 9 => "@reason";
95	root	1.6	}
96
97	root	1.18	# called after handshake was successful
98			sub transport_connect {
99	root	1.1	my ($self, $transport) = @_;
100
101	root	1.28	delete $self->{trial};
102
103	root	1.51	$self->transport_error (transport_error => $self->{id}, "switched connections")
104	root	1.6	if $self->{transport};
105
106	root	1.18	delete $self->{connect_w};
107			delete $self->{connect_to};
108	root	1.8
109	root	1.15	$self->{transport} = $transport;
110	root	1.1
111	root	1.52	my $transport_send = $transport->{send};
112	root	1.19
113	root	1.46	AnyEvent::MP::Kernel::_inject_nodeevent ($self, 1);
114
115	root	1.52	$self->{send} = $transport_send;
116	root	1.18
117	root	1.52	$transport_send->($_)
118	root	1.1	for @{ delete $self->{queue} \|\| [] };
119			}
120
121	root	1.18	sub connect {
122	root	1.53	my ($self) = @_;
123	root	1.18
124	root	1.23	return if $self->{transport};
125	root	1.55	return if $self->{connect_w};
126	root	1.23
127	root	1.66	# we unweaken the node reference, in case it was weakened before
128			$AnyEvent::MP::Kernel::NODE{$self->{id}}
129			= $AnyEvent::MP::Kernel::NODE{$self->{id}};
130
131	root	1.18	Scalar::Util::weaken $self;
132	root	1.8
133	root	1.59	$self->{connect_to} \|\|= AE::timer $AnyEvent::MP::Kernel::CONFIG->{connect_interval}, 0, sub {
134	root	1.66	$self->transport_error (transport_error => $self->{id}, "connect timeout");
135	root	1.59	};
136
137			# maybe @$addresses?
138			my $addresses = $AnyEvent::MP::Kernel::GLOBAL_DB{"'l"}{$self->{id}};
139
140			if ($addresses) {
141			$self->connect_to ($addresses);
142			} else {
143			# on global nodes, all bets are off now - we either know the node, or we don't
144	root	1.66	if ($AnyEvent::MP::Kernel::GLOBAL) {
145			$self->transport_error (transport_error => $self->{id}, "no known address");
146			} else {
147	root	1.59	AnyEvent::MP::Kernel::g_find ($self->{id});
148			}
149			}
150			}
151
152			sub connect_to {
153			my ($self, $addresses) = @_;
154
155			return if $self->{transport};
156			return if $self->{connect_w};
157
158	root	1.66	unless (@$addresses) {
159			$self->transport_error (transport_error => $self->{id}, "no known address");
160			return;
161			}
162	root	1.59
163	root	1.62	AE::log 9 => "connecting to $self->{id} with [@$addresses]";
164	root	1.59
165			my $monitor = $AnyEvent::MP::Kernel::CONFIG->{monitor_timeout};
166			my $interval = $AnyEvent::MP::Kernel::CONFIG->{connect_interval};
167
168			$interval = ($monitor - $interval) / @$addresses
169			if ($monitor - $interval) / @$addresses < $interval;
170
171			$interval = 0.4 if $interval < 0.4;
172
173			my @endpoints = reverse @$addresses;
174
175			$self->{connect_w} = AE::timer 0, $interval * (0.9 + 0.1 * rand), sub {
176	root	1.68	my $endpoint = pop @endpoints
177	root	1.69	or return;
178	root	1.59
179	root	1.62	AE::log 9 => "connecting to $self->{id} at $endpoint";
180	root	1.59
181			$self->{trial}{$endpoint} \|\|= do {
182			my ($host, $port) = AnyEvent::Socket::parse_hostport $endpoint
183	root	1.62	or return AE::log critical => "$self->{id}: '$endpoint' is not a resolved node reference.";
184	root	1.33
185			AnyEvent::MP::Transport::mp_connect
186			$host, $port,
187			sub { delete $self->{trial}{$endpoint} },
188			};
189			};
190	root	1.8	}
191
192	root	1.18	sub kill {
193			my ($self, $port, @reason) = @_;
194	root	1.4
195	root	1.66	$self->{send} (["", kil1 => $port, @reason]);
196	root	1.1	}
197
198	root	1.18	sub monitor {
199			my ($self, $portid, $cb) = @_;
200
201			my $list = $self->{lmon}{$portid} \|\|= [];
202
203			$self->send (["", mon1 => $portid])
204	root	1.24	unless @$list \|\| !length $portid;
205	root	1.1
206	root	1.18	push @$list, $cb;
207			}
208	root	1.1
209	root	1.18	sub unmonitor {
210			my ($self, $portid, $cb) = @_;
211	root	1.1
212	root	1.18	my $list = $self->{lmon}{$portid}
213			or return;
214	root	1.1
215	root	1.18	@$list = grep $_ != $cb, @$list;
216	root	1.1
217	root	1.18	unless (@$list) {
218			$self->send (["", mon0 => $portid]);
219			delete $self->{monitor}{$portid};
220	root	1.1	}
221	root	1.18	}
222	root	1.1
223	root	1.64	package AnyEvent::MP::Node::Self; # the local node
224	root	1.1
225			use base "AnyEvent::MP::Node";
226
227	root	1.20	sub connect {
228			# we are trivially connected
229			}
230
231	root	1.38	# delay every so often to avoid recursion, also used to delay after spawn
232	root	1.43	our $DELAY = -50;
233	root	1.38	our @DELAY;
234			our $DELAY_W;
235
236	root	1.61	our $send_delayed = sub {
237	root	1.60	$AnyEvent::MP::Kernel::SRCNODE = $AnyEvent::MP::Kernel::NODE;
238	root	1.39	(shift @DELAY)->()
239	root	1.38	while @DELAY;
240			undef $DELAY_W;
241			$DELAY = -50;
242	root	1.61	};
243	root	1.38
244	root	1.18	sub transport_reset {
245			my ($self) = @_;
246	root	1.1
247	root	1.19	Scalar::Util::weaken $self;
248
249	root	1.18	$self->{send} = sub {
250	root	1.61	if (++$DELAY > 0) {
251	root	1.39	my $msg = $_[0];
252			push @DELAY, sub { AnyEvent::MP::Kernel::_inject (@$msg) };
253	root	1.61	$DELAY_W \|\|= AE::timer 0, 0, $send_delayed;
254	root	1.40	return;
255	root	1.38	}
256	root	1.40
257	root	1.60	local $AnyEvent::MP::Kernel::SRCNODE = $AnyEvent::MP::Kernel::NODE;
258	root	1.40	AnyEvent::MP::Kernel::_inject (@{ $_[0] });
259	root	1.18	};
260	root	1.6	}
261
262	root	1.28	sub transport_connect {
263			my ($self, $tp) = @_;
264
265	root	1.62	AE::log 9 => "I refuse to talk to myself ($tp->{peerhost}:$tp->{peerport})";
266	root	1.28	}
267
268	root	1.7	sub kill {
269	root	1.49	my (undef, @args) = @_;
270	root	1.7
271	root	1.44	# we _always_ delay kil's, to avoid calling mon callbacks
272			# from anything but the event loop context.
273			$DELAY = 1;
274	root	1.48	push @DELAY, sub { AnyEvent::MP::Kernel::_kill (@args) };
275	root	1.61	$DELAY_W \|\|= AE::timer 0, 0, $send_delayed;
276	root	1.7	}
277
278	root	1.6	sub monitor {
279	root	1.50	# maybe always delay, too?
280	root	1.49	if ($DELAY_W) {
281			my @args = @_;
282			push @DELAY, sub { AnyEvent::MP::Kernel::_monitor (@args) };
283			return;
284			}
285			&AnyEvent::MP::Kernel::_monitor;
286	root	1.6	}
287
288			sub unmonitor {
289	root	1.50	# no need to always delay
290	root	1.49	if ($DELAY_W) {
291			my @args = @_;
292			push @DELAY, sub { AnyEvent::MP::Kernel::_unmonitor (@args) };
293			return;
294			}
295	root	1.39
296	root	1.49	&AnyEvent::MP::Kernel::_unmonitor;
297	root	1.1	}
298
299			=head1 SEE ALSO
300
301	root	1.17	L<AnyEvent::MP>.
302	root	1.1
303			=head1 AUTHOR
304
305			Marc Lehmann <schmorp@schmorp.de>
306			http://home.schmorp.de/
307
308			=cut
309
310			1
311