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, @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 {
   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:	1.48
Committed:	Wed Dec 30 13:37:53 2009 UTC (14 years, 5 months ago) by root
Branch:	MAIN
Changes since 1.47:	+2 -14 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	$self
34	}
35
36	sub init {
37	#
38	}
39
40	sub send {
41	&{ shift->{send} }
42	}
43
44	# nodes reachable via the network
45	package AnyEvent::MP::Node::External;
46
47	use base "AnyEvent::MP::Node";
48
49	# called at init time, mostly sets {send}
50	sub transport_reset {
51	my ($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 => "switched connections")
95	if $self->{transport};
96
97	delete $self->{connect_addr};
98	delete $self->{connect_w};
99	delete $self->{connect_to};
100
101	$self->{transport} = $transport;
102
103	my $transport_send = $transport->can ("send");
104
105	AnyEvent::MP::Kernel::_inject_nodeevent ($self, 1);
106
107	$self->{send} = sub {
108	$transport_send->($transport, $_[0]);
109	};
110
111	$transport->send ($_)
112	for @{ delete $self->{queue} \|\| [] };
113	}
114
115	sub connect {
116	my ($self, @addresses) = @_;
117
118	return if $self->{transport};
119
120	Scalar::Util::weaken $self;
121
122	my $monitor = $AnyEvent::MP::Kernel::CONFIG->{monitor_timeout};
123
124	$self->{connect_to} \|\|= AE::timer $monitor, 0, sub {
125	$self->transport_error (transport_error => $self->{id}, "unable to connect");
126	};
127
128	return unless @addresses;
129
130	if ($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
138	$AnyEvent::MP::Kernel::WARN->(9, "connecting to $self->{id} with [@addresses]");
139
140	my $interval = $AnyEvent::MP::Kernel::CONFIG->{connect_interval};
141
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	$self->{connect_w} = AE::timer 0.050 * rand, $interval * (0.9 + 0.1 * rand), sub {
150	@endpoints = @addresses
151	unless @endpoints;
152
153	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	}
167
168	sub kill {
169	my ($self, $port, @reason) = @_;
170
171	$self->send (["", kil => $port, @reason]);
172	}
173
174	sub monitor {
175	my ($self, $portid, $cb) = @_;
176
177	my $list = $self->{lmon}{$portid} \|\|= [];
178
179	$self->send (["", mon1 => $portid])
180	unless @$list \|\| !length $portid;
181
182	push @$list, $cb;
183	}
184
185	sub unmonitor {
186	my ($self, $portid, $cb) = @_;
187
188	my $list = $self->{lmon}{$portid}
189	or return;
190
191	@$list = grep $_ != $cb, @$list;
192
193	unless (@$list) {
194	$self->send (["", mon0 => $portid]);
195	delete $self->{monitor}{$portid};
196	}
197	}
198
199	# used for direct slave connections as well
200	package AnyEvent::MP::Node::Direct;
201
202	use base "AnyEvent::MP::Node::External";
203
204	package AnyEvent::MP::Node::Self;
205
206	use base "AnyEvent::MP::Node";
207
208	sub connect {
209	# we are trivially connected
210	}
211
212	# delay every so often to avoid recursion, also used to delay after spawn
213	our $DELAY = -50;
214	our @DELAY;
215	our $DELAY_W;
216
217	sub _send_delayed {
218	local $AnyEvent::MP::Kernel::SRCNODE = $AnyEvent::MP::Kernel::NODE{""};
219	(shift @DELAY)->()
220	while @DELAY;
221	undef $DELAY_W;
222	$DELAY = -50;
223	}
224
225	sub transport_reset {
226	my ($self) = @_;
227
228	Scalar::Util::weaken $self;
229
230	$self->{send} = sub {
231	if ($DELAY++ >= 0) {
232	my $msg = $_[0];
233	push @DELAY, sub { AnyEvent::MP::Kernel::_inject (@$msg) };
234	$DELAY_W \|\|= AE::timer 0, 0, \&_send_delayed;
235	return;
236	}
237
238	local $AnyEvent::MP::Kernel::SRCNODE = $self;
239	AnyEvent::MP::Kernel::_inject (@{ $_[0] });
240	};
241	}
242
243	sub transport_connect {
244	my ($self, $tp) = @_;
245
246	$AnyEvent::MP::Kernel::WARN->(9, "I refuse to talk to myself ($tp->{peerhost}:$tp->{peerport})");
247	}
248
249	sub kill {
250	my ($self, @args) = @_;
251
252	# we _always_ delay kil's, to avoid calling mon callbacks
253	# from anything but the event loop context.
254	$DELAY = 1;
255	push @DELAY, sub { AnyEvent::MP::Kernel::_kill (@args) };
256	$DELAY_W \|\|= AE::timer 0, 0, \&_send_delayed;
257	}
258
259	sub monitor {
260	my ($self, $portid, $cb) = @_;
261
262	my $delay_cb = sub {
263	return $cb->(no_such_port => "cannot monitor nonexistent port", "$self->{id}#$portid")
264	unless exists $AnyEvent::MP::Kernel::PORT{$portid};
265
266	$AnyEvent::MP::Kernel::LMON{$portid}{$cb+0} = $cb;
267	};
268
269	$DELAY_W ? push @DELAY, $delay_cb : &$delay_cb;
270	}
271
272	sub unmonitor {
273	my ($self, $portid, $cb) = @_;
274
275	my $delay_cb = sub {
276	delete $AnyEvent::MP::Kernel::LMON{$portid}{$cb+0};
277	};
278
279	$DELAY_W ? push @DELAY, $delay_cb : &$delay_cb;
280	}
281
282	=head1 SEE ALSO
283
284	L<AnyEvent::MP>.
285
286	=head1 AUTHOR
287
288	Marc Lehmann <schmorp@schmorp.de>
289	http://home.schmorp.de/
290
291	=cut
292
293	1
294