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_w};
   delete $self->{connect_to};

   $self->{transport} = $transport;

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

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

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

   $transport->send ($_)
      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;
   return if $self->{connect_w};

   $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;
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};
      delete $AnyEvent::MP::Kernel::PORT_DATA{$port};

      my $mon = delete $AnyEvent::MP::Kernel::LMON{$port}
         or !@reason
         or $AnyEvent::MP::Kernel::WARN->(8, "unmonitored local port $port died with reason: @reason");

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

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

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:	1.40
Committed:	Tue Sep 8 20:56:05 2009 UTC (14 years, 8 months ago) by root
Branch:	MAIN
Changes since 1.39:	+4 -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	$self
34	}
35
36	sub init {
37	#
38	}
39
40	sub send {
41	&{ shift->{send} }
42	}
43
44	# nodes reachable via the network
45	package AnyEvent::MP::Node::External;
46
47	use base "AnyEvent::MP::Node";
48
49	# called at init time, mostly sets {send}
50	sub transport_reset {
51	my ($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_w};
98	delete $self->{connect_to};
99
100	$self->{transport} = $transport;
101
102	my $transport_send = $transport->can ("send");
103
104	$self->{send} = sub {
105	$transport_send->($transport, $_[0]);
106	};
107
108	AnyEvent::MP::Kernel::_inject_nodeevent ($self, 1);
109
110	$transport->send ($_)
111	for @{ delete $self->{queue} \|\| [] };
112	}
113
114	sub connect {
115	my ($self, @addresses) = @_;
116
117	return if $self->{transport};
118
119	Scalar::Util::weaken $self;
120
121	my $monitor = $AnyEvent::MP::Kernel::CONFIG->{monitor_timeout};
122
123	$self->{connect_to} \|\|= AE::timer $monitor, 0, sub {
124	$self->transport_error (transport_error => $self->{id}, "unable to connect");
125	};
126
127	return unless @addresses;
128	return if $self->{connect_w};
129
130	$AnyEvent::MP::Kernel::WARN->(9, "connecting to $self->{id} with [@addresses]");
131
132	my $interval = $AnyEvent::MP::Kernel::CONFIG->{connect_interval};
133
134	$interval = ($monitor - $interval) / @addresses
135	if ($monitor - $interval) / @addresses < $interval;
136
137	$interval = 0.4 if $interval < 0.4;
138
139	my @endpoints;
140
141	$self->{connect_w} = AE::timer 0.050 * rand, $interval * (0.9 + 0.1 * rand), sub {
142	@endpoints = @addresses
143	unless @endpoints;
144
145	my $endpoint = shift @endpoints;
146
147	$AnyEvent::MP::Kernel::WARN->(9, "connecting to $self->{id} at $endpoint");
148
149	$self->{trial}{$endpoint} \|\|= do {
150	my ($host, $port) = AnyEvent::Socket::parse_hostport $endpoint
151	or return $AnyEvent::MP::Kernel::WARN->(1, "$self->{id}: not a resolved node reference.");
152
153	AnyEvent::MP::Transport::mp_connect
154	$host, $port,
155	sub { delete $self->{trial}{$endpoint} },
156	};
157	};
158	}
159
160	sub kill {
161	my ($self, $port, @reason) = @_;
162
163	$self->send (["", kil => $port, @reason]);
164	}
165
166	sub monitor {
167	my ($self, $portid, $cb) = @_;
168
169	my $list = $self->{lmon}{$portid} \|\|= [];
170
171	$self->send (["", mon1 => $portid])
172	unless @$list \|\| !length $portid;
173
174	push @$list, $cb;
175	}
176
177	sub unmonitor {
178	my ($self, $portid, $cb) = @_;
179
180	my $list = $self->{lmon}{$portid}
181	or return;
182
183	@$list = grep $_ != $cb, @$list;
184
185	unless (@$list) {
186	$self->send (["", mon0 => $portid]);
187	delete $self->{monitor}{$portid};
188	}
189	}
190
191	# used for direct slave connections as well
192	package AnyEvent::MP::Node::Direct;
193
194	use base "AnyEvent::MP::Node::External";
195
196	package AnyEvent::MP::Node::Self;
197
198	use base "AnyEvent::MP::Node";
199
200	sub connect {
201	# we are trivially connected
202	}
203
204	# delay every so often to avoid recursion, also used to delay after spawn
205	our $DELAY;
206	our @DELAY;
207	our $DELAY_W;
208
209	sub _send_delayed {
210	local $AnyEvent::MP::Kernel::SRCNODE = $AnyEvent::MP::Kernel::NODE{""};
211	(shift @DELAY)->()
212	while @DELAY;
213	undef $DELAY_W;
214	$DELAY = -50;
215	}
216
217	sub transport_reset {
218	my ($self) = @_;
219
220	Scalar::Util::weaken $self;
221
222	$self->{send} = sub {
223	if ($DELAY++ >= 0) {
224	my $msg = $_[0];
225	push @DELAY, sub { AnyEvent::MP::Kernel::_inject (@$msg) };
226	$DELAY_W \|\|= AE::timer 0, 0, \&_send_delayed;
227	return;
228	}
229
230	local $AnyEvent::MP::Kernel::SRCNODE = $self;
231	AnyEvent::MP::Kernel::_inject (@{ $_[0] });
232	};
233	}
234
235	sub transport_connect {
236	my ($self, $tp) = @_;
237
238	$AnyEvent::MP::Kernel::WARN->(9, "I refuse to talk to myself ($tp->{peerhost}:$tp->{peerport})");
239	}
240
241	sub kill {
242	my ($self, $port, @reason) = @_;
243
244	my $delay_cb = sub {
245	delete $AnyEvent::MP::Kernel::PORT{$port};
246	delete $AnyEvent::MP::Kernel::PORT_DATA{$port};
247
248	my $mon = delete $AnyEvent::MP::Kernel::LMON{$port}
249	or !@reason
250	or $AnyEvent::MP::Kernel::WARN->(8, "unmonitored local port $port died with reason: @reason");
251
252	$_->(@reason) for values %$mon;
253	};
254
255	$DELAY_W ? push @DELAY, $delay_cb : &$delay_cb;
256	}
257
258	sub monitor {
259	my ($self, $portid, $cb) = @_;
260
261	my $delay_cb = sub {
262	return $cb->(no_such_port => "cannot monitor nonexistent port", "$self->{id}#$portid")
263	unless exists $AnyEvent::MP::Kernel::PORT{$portid};
264
265	$AnyEvent::MP::Kernel::LMON{$portid}{$cb+0} = $cb;
266	};
267
268	$DELAY_W ? push @DELAY, $delay_cb : &$delay_cb;
269	}
270
271	sub unmonitor {
272	my ($self, $portid, $cb) = @_;
273
274	my $delay_cb = sub {
275	delete $AnyEvent::MP::Kernel::LMON{$portid}{$cb+0};
276	};
277
278	$DELAY_W ? push @DELAY, $delay_cb : &$delay_cb;
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