AnyEvent-MP/MP/Global.pm

=head1 NAME

AnyEvent::MP::Global - some network-global services

=head1 SYNOPSIS

   use AnyEvent::MP::Global;
   # -OR-
   aemp addservice AnyEvent::MP::Global::

=head1 DESCRIPTION

This module provides an assortment of network-global functions: group name
registration and non-local locks.

It will also try to build and maintain a full mesh of all network nodes.

While it isn't mandatory to run the global services, running it on one
node will automatically run it on all nodes.

=head1 GLOBALS AND FUNCTIONS

=over 4

=cut

package AnyEvent::MP::Global;

use common::sense;
use Carp ();
use MIME::Base64 ();

use AnyEvent ();
use AnyEvent::Util ();

use AnyEvent::MP;
use AnyEvent::MP::Kernel;

our $VERSION = $AnyEvent::MP::VERSION;

our %addr; # port ID => [address...] mapping

our %port; # our rendezvous port on the other side
our %lreg; # local registry, name => [pid...]
our %lmon; # local rgeistry monitoring name,pid => mon
our %greg; # global regstry, name => [pid...]

our $nodecnt;

$AnyEvent::MP::Kernel::WARN->(7, "starting global service.");

#############################################################################
# seednodes

our @SEEDS;
our $SEED_WATCHER;

sub seed_connect {
   my ($seed) = @_;

   my ($host, $port) = AnyEvent::Socket::parse_hostport $seed
      or Carp::croak "$seed: unparsable seed address";

   # ughhh
   my $tp; $tp = AnyEvent::MP::Transport::mp_connect $host, $port,
      release => \&more_seeding,
      sub {
         $tp = shift;
         $tp->{keepalive} = $tp;
      },
   ;
}

sub more_seeding {
   return if $nodecnt;
   return unless @SEEDS;

   $AnyEvent::MP::Kernel::WARN->(9, "no nodes connected, seeding.");

   seed_connect $SEEDS[rand @SEEDS];
}

sub set_seeds(@) {
   @SEEDS = @_;

   $SEED_WATCHER ||= AE::timer 5, $AnyEvent::MP::Kernel::MONITOR_TIMEOUT, \&more_seeding;

   seed_connect $_
      for @SEEDS;
}

#############################################################################

sub unreg_groups($) {
   my ($node) = @_;

   my $qr = qr/^\Q$node\E(?:#|$)/;

   for my $group (values %greg) {
      @$group = grep $_ !~ $qr, @$group;
   }
}

sub set_groups($$) {
   my ($node, $lreg) = @_;

   while (my ($k, $v) = each %$lreg) {
      push @{ $greg{$k} }, @$v;
   }
}

=item $ports = find $group

Returns all the ports currently registered to the given group (as
read-only array reference). When the group has no registered members,
return C<undef>.

=cut

sub find($) {
   @{ $greg{$_[0]} }
      ? $greg{$_[0]}
      : undef
}

=item $guard = register $port, $group

Register the given (local!) port in the named global group C<$group>.

The port will be unregistered automatically when the port is destroyed.

When not called in void context, then a guard object will be returned that
will also cause the name to be unregistered when destroyed.

=cut

# register port from any node
sub _register {
   my ($port, $group) = @_;

   push @{ $greg{$group} }, $port;
}

# unregister port from any node
sub _unregister {
   my ($port, $group) = @_;

   @{ $greg{$group} } = grep $_ ne $port, @{ $greg{$group} };
}

# unregister local port
sub unregister {
   my ($port, $group) = @_;

   delete $lmon{"$group\x00$port"};
   @{ $lreg{$group} } = grep $_ ne $port, @{ $lreg{$group} };

   _unregister $port, $group;

   snd $_, reg0 => $port, $group
      for values %port;
}

# register local port
sub register($$) {
   my ($port, $group) = @_;

   port_is_local $port
      or Carp::croak "AnyEvent::MP::Global::register can only be called for local ports, caught";

   $lmon{"$group\x00$port"} = mon $port, sub { unregister $port, $group };
   push @{ $lreg{$group} }, $port;

   snd $_, reg1 => $port, $group
      for values %port;

   _register $port, $group;

   wantarray && AnyEvent::Util::guard { unregister $port, $group }
}

sub start_node {
   my ($node) = @_;

   return if exists $port{$node};
   return if $node eq $NODE; # do not connect to ourselves

   # establish connection
   my $port = $port{$node} = spawn $node, "AnyEvent::MP::Global::connect", 0, $NODE;

   mon $port, sub {
      unreg_groups $node;
      delete $port{$node};
   };

   snd $port, addr => $AnyEvent::MP::Kernel::LISTENER;
   snd $port, connect_nodes => \%addr if %addr;
   snd $port, set => \%lreg if %lreg;
}

# other nodes connect via this
sub connect {
   my ($version, $node) = @_;

   # monitor them, silently die
   mon $node, psub { kil $SELF };

   rcv $SELF,
      addr => sub {
         my $addresses = shift;
         $AnyEvent::MP::Kernel::WARN->(9, "$node told us it's addresses (@$addresses).");
         $addr{$node} = $addresses;

         # to help listener-less nodes, we broadcast new addresses to them unconditionally
         #TODO: should be done by a node finding out about a listener-less one
         if (@$addresses) {
            for my $other (values %AnyEvent::MP::NODE) {
               if ($other->{transport}) {
                  if ($addr{$other->{id}}) {
                     if (!{ $addr{$other} }) {
                        $AnyEvent::MP::Kernel::WARN->(9, "helping $other->{id} to find $node.");
                        snd $port{$other}, connect_nodes => { $node => $addresses };
                     }
                  }
               }
            }
         }
      },
      connect_nodes => sub {
         my ($kv) = @_;

         use JSON::XS;#d#
         my $kv_txt = JSON::XS->new->encode ($kv);#d#
         $AnyEvent::MP::Kernel::WARN->(9, "$node told us it knows about $kv_txt.");#d#

         while (my ($id, $addresses) = each %$kv) {
            my $node = AnyEvent::MP::Kernel::add_node $id;
            $node->connect (@$addresses);
            start_node $id;
         }
      },
      find_node => sub {
         my ($othernode) = @_;

         $AnyEvent::MP::Kernel::WARN->(9, "$node asked us to find $othernode.");
         snd $port{$node}, connect_nodes => { $othernode => $addr{$othernode} }
            if $addr{$othernode};
      },
      set => sub {
         set_groups $node, shift;
      },
      reg1 => \&_register,
      reg0 => \&_unregister,
   ;
}

sub mon_node {
   my ($node, $is_up) = @_;

   if ($is_up) {
      ++$nodecnt;
      start_node $node;
   } else {
      --$nodecnt;
      more_seeding unless $nodecnt;
      unreg_groups $node;

      # forget about the node
      delete $addr{$node};
      # ask other nodes if they know the node
      snd $_, find_node => $node
         for values %port;
   }
   #warn "node<$node,$is_up>\n";#d#
}

mon_node $_, 1
   for up_nodes;

mon_nodes \&mon_node;

=back

=head1 SEE ALSO

L<AnyEvent::MP>.

=head1 AUTHOR

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

=cut

1

Revision:	1.10
Committed:	Thu Aug 27 23:46:33 2009 UTC (17 years ago) by root
Branch:	MAIN
Changes since 1.9:	+1 -1 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	=head1 NAME
2
3			AnyEvent::MP::Global - some network-global services
4
5			=head1 SYNOPSIS
6
7			use AnyEvent::MP::Global;
8			# -OR-
9			aemp addservice AnyEvent::MP::Global::
10
11			=head1 DESCRIPTION
12
13			This module provides an assortment of network-global functions: group name
14			registration and non-local locks.
15
16			It will also try to build and maintain a full mesh of all network nodes.
17
18	root	1.3	While it isn't mandatory to run the global services, running it on one
19			node will automatically run it on all nodes.
20
21	root	1.1	=head1 GLOBALS AND FUNCTIONS
22
23			=over 4
24
25			=cut
26
27			package AnyEvent::MP::Global;
28
29			use common::sense;
30			use Carp ();
31			use MIME::Base64 ();
32
33	root	1.8	use AnyEvent ();
34	root	1.4	use AnyEvent::Util ();
35
36	root	1.1	use AnyEvent::MP;
37			use AnyEvent::MP::Kernel;
38
39			our $VERSION = $AnyEvent::MP::VERSION;
40
41	root	1.8	our %addr; # port ID => [address...] mapping
42
43	root	1.4	our %port; # our rendezvous port on the other side
44			our %lreg; # local registry, name => [pid...]
45			our %lmon; # local rgeistry monitoring name,pid => mon
46			our %greg; # global regstry, name => [pid...]
47
48	root	1.8	our $nodecnt;
49
50	root	1.5	$AnyEvent::MP::Kernel::WARN->(7, "starting global service.");
51
52	root	1.8	#############################################################################
53			# seednodes
54
55			our @SEEDS;
56			our $SEED_WATCHER;
57
58			sub seed_connect {
59			my ($seed) = @_;
60
61			my ($host, $port) = AnyEvent::Socket::parse_hostport $seed
62			or Carp::croak "$seed: unparsable seed address";
63
64			# ughhh
65			my $tp; $tp = AnyEvent::MP::Transport::mp_connect $host, $port,
66			release => \&more_seeding,
67			sub {
68			$tp = shift;
69			$tp->{keepalive} = $tp;
70			},
71			;
72			}
73
74			sub more_seeding {
75			return if $nodecnt;
76			return unless @SEEDS;
77
78			$AnyEvent::MP::Kernel::WARN->(9, "no nodes connected, seeding.");
79
80			seed_connect $SEEDS[rand @SEEDS];
81			}
82
83			sub set_seeds(@) {
84			@SEEDS = @_;
85
86			$SEED_WATCHER \|\|= AE::timer 5, $AnyEvent::MP::Kernel::MONITOR_TIMEOUT, \&more_seeding;
87
88			seed_connect $_
89			for @SEEDS;
90			}
91
92			#############################################################################
93
94	root	1.4	sub unreg_groups($) {
95	root	1.8	my ($node) = @_;
96	root	1.4
97	root	1.8	my $qr = qr/^\Q$node\E(?:#\|$)/;
98	root	1.4
99			for my $group (values %greg) {
100			@$group = grep $_ !~ $qr, @$group;
101			}
102			}
103
104			sub set_groups($$) {
105	root	1.8	my ($node, $lreg) = @_;
106	root	1.5
107	root	1.6	while (my ($k, $v) = each %$lreg) {
108			push @{ $greg{$k} }, @$v;
109			}
110	root	1.4	}
111
112	root	1.7	=item $ports = find $group
113
114			Returns all the ports currently registered to the given group (as
115			read-only array reference). When the group has no registered members,
116			return C<undef>.
117
118			=cut
119
120			sub find($) {
121			@{ $greg{$_[0]} }
122			? $greg{$_[0]}
123			: undef
124			}
125
126	root	1.4	=item $guard = register $port, $group
127
128			Register the given (local!) port in the named global group C<$group>.
129
130			The port will be unregistered automatically when the port is destroyed.
131
132			When not called in void context, then a guard object will be returned that
133			will also cause the name to be unregistered when destroyed.
134
135			=cut
136
137			# register port from any node
138			sub _register {
139			my ($port, $group) = @_;
140
141			push @{ $greg{$group} }, $port;
142			}
143
144	root	1.6	# unregister port from any node
145			sub _unregister {
146			my ($port, $group) = @_;
147
148			@{ $greg{$group} } = grep $_ ne $port, @{ $greg{$group} };
149			}
150
151	root	1.4	# unregister local port
152			sub unregister {
153			my ($port, $group) = @_;
154
155			delete $lmon{"$group\x00$port"};
156			@{ $lreg{$group} } = grep $_ ne $port, @{ $lreg{$group} };
157
158			_unregister $port, $group;
159
160			snd $_, reg0 => $port, $group
161			for values %port;
162			}
163
164			# register local port
165			sub register($$) {
166			my ($port, $group) = @_;
167
168			port_is_local $port
169			or Carp::croak "AnyEvent::MP::Global::register can only be called for local ports, caught";
170
171			$lmon{"$group\x00$port"} = mon $port, sub { unregister $port, $group };
172			push @{ $lreg{$group} }, $port;
173
174			snd $_, reg1 => $port, $group
175			for values %port;
176
177			_register $port, $group;
178
179			wantarray && AnyEvent::Util::guard { unregister $port, $group }
180			}
181
182			sub start_node {
183	root	1.8	my ($node) = @_;
184	root	1.4
185	root	1.8	return if exists $port{$node};
186			return if $node eq $NODE; # do not connect to ourselves
187	root	1.4
188			# establish connection
189	root	1.8	my $port = $port{$node} = spawn $node, "AnyEvent::MP::Global::connect", 0, $NODE;
190
191	root	1.4	mon $port, sub {
192	root	1.8	unreg_groups $node;
193			delete $port{$node};
194	root	1.4	};
195	root	1.8
196	root	1.10	snd $port, addr => $AnyEvent::MP::Kernel::LISTENER;
197	root	1.8	snd $port, connect_nodes => \%addr if %addr;
198			snd $port, set => \%lreg if %lreg;
199	root	1.4	}
200	root	1.3
201	root	1.5	# other nodes connect via this
202	root	1.3	sub connect {
203	root	1.8	my ($version, $node) = @_;
204	root	1.1
205	root	1.3	# monitor them, silently die
206	root	1.8	mon $node, psub { kil $SELF };
207	root	1.3
208	root	1.4	rcv $SELF,
209	root	1.8	addr => sub {
210			my $addresses = shift;
211			$AnyEvent::MP::Kernel::WARN->(9, "$node told us it's addresses (@$addresses).");
212			$addr{$node} = $addresses;
213	root	1.9
214			# to help listener-less nodes, we broadcast new addresses to them unconditionally
215			#TODO: should be done by a node finding out about a listener-less one
216			if (@$addresses) {
217			for my $other (values %AnyEvent::MP::NODE) {
218			if ($other->{transport}) {
219			if ($addr{$other->{id}}) {
220			if (!{ $addr{$other} }) {
221			$AnyEvent::MP::Kernel::WARN->(9, "helping $other->{id} to find $node.");
222			snd $port{$other}, connect_nodes => { $node => $addresses };
223			}
224			}
225			}
226			}
227			}
228	root	1.8	},
229	root	1.4	connect_nodes => sub {
230	root	1.8	my ($kv) = @_;
231
232			use JSON::XS;#d#
233			my $kv_txt = JSON::XS->new->encode ($kv);#d#
234			$AnyEvent::MP::Kernel::WARN->(9, "$node told us it knows about $kv_txt.");#d#
235
236			while (my ($id, $addresses) = each %$kv) {
237			my $node = AnyEvent::MP::Kernel::add_node $id;
238			$node->connect (@$addresses);
239			start_node $id;
240	root	1.4	}
241			},
242	root	1.8	find_node => sub {
243			my ($othernode) = @_;
244
245			$AnyEvent::MP::Kernel::WARN->(9, "$node asked us to find $othernode.");
246			snd $port{$node}, connect_nodes => { $othernode => $addr{$othernode} }
247			if $addr{$othernode};
248			},
249	root	1.4	set => sub {
250	root	1.8	set_groups $node, shift;
251	root	1.4	},
252			reg1 => \&_register,
253			reg0 => \&_unregister,
254			;
255	root	1.3	}
256	root	1.1
257			sub mon_node {
258	root	1.8	my ($node, $is_up) = @_;
259	root	1.1
260			if ($is_up) {
261	root	1.8	++$nodecnt;
262			start_node $node;
263	root	1.2	} else {
264	root	1.8	--$nodecnt;
265			more_seeding unless $nodecnt;
266			unreg_groups $node;
267
268			# forget about the node
269			delete $addr{$node};
270			# ask other nodes if they know the node
271			snd $_, find_node => $node
272			for values %port;
273	root	1.1	}
274	root	1.8	#warn "node<$node,$is_up>\n";#d#
275	root	1.1	}
276
277			mon_node $_, 1
278			for up_nodes;
279
280			mon_nodes \&mon_node;
281
282			=back
283
284			=head1 SEE ALSO
285
286			L<AnyEvent::MP>.
287
288			=head1 AUTHOR
289
290			Marc Lehmann <schmorp@schmorp.de>
291			http://home.schmorp.de/
292
293			=cut
294
295			1
296