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::External;

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 => "switched connections")
      if $self->{transport};

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

   $self->{transport} = $transport;

   my $transport_send = $transport->can ("send");

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

   $self->{send} = sub {
      $transport_send->($transport, $_[0]);
   };

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

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

   return if $self->{transport};

   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");
   };

   return unless @addresses;

   if ($self->{connect_w}) {
      # sometimes we get told about new addresses after we started to connect
      unshift @{$self->{connect_addr}}, @addresses;
      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 0.050 * rand, $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};
   }
}

# used for direct slave connections as well
package AnyEvent::MP::Node::Direct;

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

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 ($self, $port, @reason) = @_;

   my $delay_cb = sub {
      delete $AnyEvent::MP::Kernel::PORT{$port}
         or return; # killing nonexistent ports is O.K.
      delete $AnyEvent::MP::Kernel::PORT_DATA{$port};

      my $mon = delete $AnyEvent::MP::Kernel::LMON{$port}
         or !@reason
         or $AnyEvent::MP::Kernel::WARN->(2, "unmonitored local port $port died with reason: @reason");

      $_->(@reason) for values %$mon;
   };

   # we _always_ delay kil's, to avoid calling mon callbacks
   # from anything but the event loop context.
   $DELAY = 1;
   push @DELAY, $delay_cb;
   $DELAY_W ||= AE::timer 0, 0, \&_send_delayed;
}

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

   my $delay_cb = sub {
      return $cb->(no_such_port => "cannot monitor nonexistent port", "$self->{id}#$portid")
         unless exists $AnyEvent::MP::Kernel::PORT{$portid};

      $AnyEvent::MP::Kernel::LMON{$portid}{$cb+0} = $cb;
   };

   $DELAY_W ? push @DELAY, $delay_cb : &$delay_cb;
}

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

   my $delay_cb = sub {
      delete $AnyEvent::MP::Kernel::LMON{$portid}{$cb+0};
   };

   $DELAY_W ? push @DELAY, $delay_cb : &$delay_cb;
}

=head1 SEE ALSO

L<AnyEvent::MP>.

=head1 AUTHOR

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

=cut

1

Revision:	1.47
Committed:	Sat Nov 28 12:40:22 2009 UTC (14 years, 6 months ago) by root
Branch:	MAIN
CVS Tags:	rel-1_24
Changes since 1.46:	+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			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	$self
34			}
35	root	1.1
36	root	1.27	sub init {
37			#
38			}
39
40	root	1.1	sub send {
41	root	1.19	&{ shift->{send} }
42	root	1.1	}
43
44	root	1.27	# nodes reachable via the network
45	root	1.18	package AnyEvent::MP::Node::External;
46	root	1.7
47	root	1.18	use base "AnyEvent::MP::Node";
48	root	1.7
49	root	1.18	# called at init time, mostly sets {send}
50			sub transport_reset {
51			my ($self) = @_;
52	root	1.6
53	root	1.18	delete $self->{transport};
54	root	1.6
55	root	1.19	Scalar::Util::weaken $self;
56
57	root	1.18	$self->{send} = sub {
58	root	1.19	push @{$self->{queue}}, shift;
59			$self->connect;
60	root	1.18	};
61	root	1.6	}
62
63	root	1.32	# called each time we fail to establish a connection,
64			# or the existing connection failed
65	root	1.18	sub transport_error {
66			my ($self, @reason) = @_;
67	root	1.6
68	root	1.21	my $no_transport = !$self->{transport};
69
70			delete $self->{connect_w};
71			delete $self->{connect_to};
72	root	1.20
73	root	1.18	delete $self->{queue};
74			$self->transport_reset;
75	root	1.6
76	root	1.18	if (my $mon = delete $self->{lmon}) {
77			$_->(@reason) for map @$_, values %$mon;
78	root	1.6	}
79	root	1.30
80			AnyEvent::MP::Kernel::_inject_nodeevent ($self, 0, @reason)
81			unless $no_transport;
82	root	1.32
83			# if we are here and are idle, we nuke ourselves
84			delete $AnyEvent::MP::Kernel::NODE{$self->{id}}
85			unless $self->{transport} \|\| $self->{connect_to};
86	root	1.6	}
87
88	root	1.18	# called after handshake was successful
89			sub transport_connect {
90	root	1.1	my ($self, $transport) = @_;
91
92	root	1.28	delete $self->{trial};
93
94	root	1.20	$self->transport_error (transport_error => "switched connections")
95	root	1.6	if $self->{transport};
96
97	root	1.41	delete $self->{connect_addr};
98	root	1.18	delete $self->{connect_w};
99			delete $self->{connect_to};
100	root	1.8
101	root	1.15	$self->{transport} = $transport;
102	root	1.1
103	root	1.19	my $transport_send = $transport->can ("send");
104
105	root	1.46	AnyEvent::MP::Kernel::_inject_nodeevent ($self, 1);
106
107	root	1.18	$self->{send} = sub {
108	root	1.19	$transport_send->($transport, $_[0]);
109	root	1.18	};
110
111	root	1.1	$transport->send ($_)
112			for @{ delete $self->{queue} \|\| [] };
113			}
114
115	root	1.18	sub connect {
116	root	1.28	my ($self, @addresses) = @_;
117	root	1.18
118	root	1.23	return if $self->{transport};
119
120	root	1.18	Scalar::Util::weaken $self;
121	root	1.8
122	root	1.36	my $monitor = $AnyEvent::MP::Kernel::CONFIG->{monitor_timeout};
123	root	1.33
124			$self->{connect_to} \|\|= AE::timer $monitor, 0, sub {
125			$self->transport_error (transport_error => $self->{id}, "unable to connect");
126			};
127	root	1.1
128	root	1.29	return unless @addresses;
129	root	1.41
130			if ($self->{connect_w}) {
131			# sometimes we get told about new addresses after we started to connect
132			unshift @{$self->{connect_addr}}, @addresses;
133			return;
134			}
135
136			$self->{connect_addr} = \@addresses; # a bit weird, but efficient
137	root	1.29
138	root	1.28	$AnyEvent::MP::Kernel::WARN->(9, "connecting to $self->{id} with [@addresses]");
139
140	root	1.36	my $interval = $AnyEvent::MP::Kernel::CONFIG->{connect_interval};
141	root	1.33
142			$interval = ($monitor - $interval) / @addresses
143			if ($monitor - $interval) / @addresses < $interval;
144
145			$interval = 0.4 if $interval < 0.4;
146
147			my @endpoints;
148
149	root	1.34	$self->{connect_w} = AE::timer 0.050 * rand, $interval * (0.9 + 0.1 * rand), sub {
150	root	1.33	@endpoints = @addresses
151			unless @endpoints;
152	root	1.18
153	root	1.33	my $endpoint = shift @endpoints;
154
155			$AnyEvent::MP::Kernel::WARN->(9, "connecting to $self->{id} at $endpoint");
156
157			$self->{trial}{$endpoint} \|\|= do {
158			my ($host, $port) = AnyEvent::Socket::parse_hostport $endpoint
159			or return $AnyEvent::MP::Kernel::WARN->(1, "$self->{id}: not a resolved node reference.");
160
161			AnyEvent::MP::Transport::mp_connect
162			$host, $port,
163			sub { delete $self->{trial}{$endpoint} },
164			};
165			};
166	root	1.8	}
167
168	root	1.18	sub kill {
169			my ($self, $port, @reason) = @_;
170	root	1.4
171	root	1.18	$self->send (["", kil => $port, @reason]);
172	root	1.1	}
173
174	root	1.18	sub monitor {
175			my ($self, $portid, $cb) = @_;
176
177			my $list = $self->{lmon}{$portid} \|\|= [];
178
179			$self->send (["", mon1 => $portid])
180	root	1.24	unless @$list \|\| !length $portid;
181	root	1.1
182	root	1.18	push @$list, $cb;
183			}
184	root	1.1
185	root	1.18	sub unmonitor {
186			my ($self, $portid, $cb) = @_;
187	root	1.1
188	root	1.18	my $list = $self->{lmon}{$portid}
189			or return;
190	root	1.1
191	root	1.18	@$list = grep $_ != $cb, @$list;
192	root	1.1
193	root	1.18	unless (@$list) {
194			$self->send (["", mon0 => $portid]);
195			delete $self->{monitor}{$portid};
196	root	1.1	}
197	root	1.18	}
198	root	1.1
199	root	1.27	# used for direct slave connections as well
200	root	1.18	package AnyEvent::MP::Node::Direct;
201
202			use base "AnyEvent::MP::Node::External";
203	root	1.1
204			package AnyEvent::MP::Node::Self;
205
206			use base "AnyEvent::MP::Node";
207
208	root	1.20	sub connect {
209			# we are trivially connected
210			}
211
212	root	1.38	# delay every so often to avoid recursion, also used to delay after spawn
213	root	1.43	our $DELAY = -50;
214	root	1.38	our @DELAY;
215			our $DELAY_W;
216
217			sub _send_delayed {
218			local $AnyEvent::MP::Kernel::SRCNODE = $AnyEvent::MP::Kernel::NODE{""};
219	root	1.39	(shift @DELAY)->()
220	root	1.38	while @DELAY;
221			undef $DELAY_W;
222			$DELAY = -50;
223			}
224
225	root	1.18	sub transport_reset {
226			my ($self) = @_;
227	root	1.1
228	root	1.19	Scalar::Util::weaken $self;
229
230	root	1.18	$self->{send} = sub {
231	root	1.38	if ($DELAY++ >= 0) {
232	root	1.39	my $msg = $_[0];
233			push @DELAY, sub { AnyEvent::MP::Kernel::_inject (@$msg) };
234	root	1.38	$DELAY_W \|\|= AE::timer 0, 0, \&_send_delayed;
235	root	1.40	return;
236	root	1.38	}
237	root	1.40
238			local $AnyEvent::MP::Kernel::SRCNODE = $self;
239			AnyEvent::MP::Kernel::_inject (@{ $_[0] });
240	root	1.18	};
241	root	1.6	}
242
243	root	1.28	sub transport_connect {
244			my ($self, $tp) = @_;
245
246			$AnyEvent::MP::Kernel::WARN->(9, "I refuse to talk to myself ($tp->{peerhost}:$tp->{peerport})");
247			}
248
249	root	1.7	sub kill {
250			my ($self, $port, @reason) = @_;
251
252	root	1.39	my $delay_cb = sub {
253	root	1.42	delete $AnyEvent::MP::Kernel::PORT{$port}
254			or return; # killing nonexistent ports is O.K.
255	root	1.39	delete $AnyEvent::MP::Kernel::PORT_DATA{$port};
256
257			my $mon = delete $AnyEvent::MP::Kernel::LMON{$port}
258			or !@reason
259	root	1.47	or $AnyEvent::MP::Kernel::WARN->(2, "unmonitored local port $port died with reason: @reason");
260	root	1.7
261	root	1.39	$_->(@reason) for values %$mon;
262			};
263	root	1.7
264	root	1.44	# we _always_ delay kil's, to avoid calling mon callbacks
265			# from anything but the event loop context.
266			$DELAY = 1;
267			push @DELAY, $delay_cb;
268	root	1.45	$DELAY_W \|\|= AE::timer 0, 0, \&_send_delayed;
269	root	1.7	}
270
271	root	1.6	sub monitor {
272			my ($self, $portid, $cb) = @_;
273
274	root	1.39	my $delay_cb = sub {
275			return $cb->(no_such_port => "cannot monitor nonexistent port", "$self->{id}#$portid")
276			unless exists $AnyEvent::MP::Kernel::PORT{$portid};
277
278			$AnyEvent::MP::Kernel::LMON{$portid}{$cb+0} = $cb;
279			};
280	root	1.6
281	root	1.39	$DELAY_W ? push @DELAY, $delay_cb : &$delay_cb;
282	root	1.6	}
283
284			sub unmonitor {
285			my ($self, $portid, $cb) = @_;
286
287	root	1.39	my $delay_cb = sub {
288			delete $AnyEvent::MP::Kernel::LMON{$portid}{$cb+0};
289			};
290
291			$DELAY_W ? push @DELAY, $delay_cb : &$delay_cb;
292	root	1.1	}
293
294			=head1 SEE ALSO
295
296	root	1.17	L<AnyEvent::MP>.
297	root	1.1
298			=head1 AUTHOR
299
300			Marc Lehmann <schmorp@schmorp.de>
301			http://home.schmorp.de/
302
303			=cut
304
305			1
306