AnyEvent-MP/MP/Kernel.pm

=head1 NAME

AnyEvent::MP::Kernel - the actual message passing kernel

=head1 SYNOPSIS

   use AnyEvent::MP::Kernel;

=head1 DESCRIPTION

This module provides most of the basic functionality of AnyEvent::MP,
exposed through higher level interfaces such as L<AnyEvent::MP> and
L<Coro::MP>.

This module is mainly of interest when knowledge about connectivity,
connected nodes etc. is sought.

=head1 GLOBALS AND FUNCTIONS

=over 4

=cut

package AnyEvent::MP::Kernel;

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

use AE ();

use AnyEvent::MP::Node;
use AnyEvent::MP::Transport;

use base "Exporter";

our $VERSION = '1.0';
our @EXPORT = qw(
   %NODE %PORT %PORT_DATA $UNIQ $RUNIQ $ID
   add_node load_func snd_to_func snd_on eval_on

   NODE $NODE node_of snd kil port_is_local
   configure
   up_nodes mon_nodes node_is_up
);

=item $AnyEvent::MP::Kernel::WARN->($level, $msg)

This value is called with an error or warning message, when e.g. a
connection could not be created, authorisation failed and so on.

It I<must not> block or send messages -queue it and use an idle watcher if
you need to do any of these things.

C<$level> should be C<0> for messages to be logged always, C<1> for
unexpected messages and errors, C<2> for warnings, C<7> for messages about
node connectivity and services, C<8> for debugging messages and C<9> for
tracing messages.

The default simply logs the message to STDERR.

=item @AnyEvent::MP::Kernel::WARN

All code references in this array are called for every log message, from
the default C<$WARN> handler. This is an easy way to tie into the log
messages without disturbing others.

=cut

our $WARNLEVEL = exists $ENV{PERL_ANYEVENT_MP_WARNLEVEL} ? $ENV{PERL_ANYEVENT_MP_WARNLEVEL} : 5;
our @WARN;
our $WARN = sub {
   &$_ for @WARN;

   return if $WARNLEVEL < $_[0];

   my ($level, $msg) = @_;

   $msg =~ s/\n$//;

   printf STDERR "%s <%d> %s\n",
          (POSIX::strftime "%Y-%m-%d %H:%M:%S", localtime time),
          $level,
          $msg;
};

=item $AnyEvent::MP::Kernel::WARNLEVEL [default 5 or $ENV{PERL_ANYEVENT_MP_WARNLEVEL}]

The maximum level at which warning messages will be printed to STDERR by
the default warn handler.

=cut

sub load_func($) {
   my $func = $_[0];

   unless (defined &$func) {
      my $pkg = $func;
      do {
         $pkg =~ s/::[^:]+$//
            or return sub { die "unable to resolve '$func'" };
         eval "require $pkg";
      } until defined &$func;
   }

   \&$func
}

sub nonce($) {
   my $nonce;

   if (open my $fh, "</dev/urandom") {
      sysread $fh, $nonce, $_[0];
   } else {
      # shit...
      $nonce = join "", map +(chr rand 256), 1 .. $_[0]
   }

   $nonce
}

sub alnumbits($) {
   my $data = $_[0];

   if (eval "use Math::GMP 2.05; 1") {
      $data = Math::GMP::get_str_gmp (
                  (Math::GMP::new_from_scalar_with_base (+(unpack "H*", $data), 16)),
                  62
              );
   } else {
      $data = MIME::Base64::encode_base64 $data, "";
      $data =~ s/=//;
      $data =~ s/x/x0/g;
      $data =~ s/\//x1/g;
      $data =~ s/\+/x2/g;
   }

   $data
}

sub gen_uniq {
   alnumbits pack "nna*", $$ & 0xffff, time & 0xffff, nonce 2
}

our $CONFIG; # this node's configuration

our $RUNIQ  = alnumbits nonce 96/8; # remote uniq value
our $UNIQ   = gen_uniq; # per-process/node unique cookie
our $NODE   = "anon/$RUNIQ";
our $ID     = "a";

our %NODE; # node id to transport mapping, or "undef", for local node
our (%PORT, %PORT_DATA); # local ports

our %RMON; # local ports monitored by remote nodes ($RMON{nodeid}{portid} == cb)
our %LMON; # monitored _local_ ports

our %LISTENER;
our $LISTENER; # our listeners, as arrayref

our $SRCNODE; # holds the sending node during _inject

sub NODE() {
   $NODE
}

sub node_of($) {
   my ($node, undef) = split /#/, $_[0], 2;

   $node
}

BEGIN {
   *TRACE = $ENV{PERL_ANYEVENT_MP_TRACE}
      ? sub () { 1 }
      : sub () { 0 };
}

our $DELAY_TIMER;
our @DELAY_QUEUE;

sub _delay_run {
   (shift @DELAY_QUEUE or return)->() while 1;
}

sub delay($) {
   push @DELAY_QUEUE, shift;
   $DELAY_TIMER ||= AE::timer 0, 0, \&_delay_run;
}

sub _inject {
   warn "RCV $SRCNODE->{id} -> " . eval { JSON::XS->new->encode (\@_) } . "\n" if TRACE && @_;#d#
   &{ $PORT{+shift} or return };
}

# this function adds a node-ref, so you can send stuff to it
# it is basically the central routing component.
sub add_node {
   my ($node) = @_;

   $NODE{$node} ||= new AnyEvent::MP::Node::Direct $node
}

sub snd(@) {
   my ($nodeid, $portid) = split /#/, shift, 2;

   warn "SND $nodeid <- " . eval { JSON::XS->new->encode (\@_) } . "\n" if TRACE && @_;#d#

   ($NODE{$nodeid} || add_node $nodeid)
      ->{send} (["$portid", @_]);
}

=item $is_local = port_is_local $port

Returns true iff the port is a local port.

=cut

sub port_is_local($) {
   my ($nodeid, undef) = split /#/, $_[0], 2;

   $NODE{$nodeid} == $NODE{""}
}

=item snd_to_func $node, $func, @args

Expects a node ID and a name of a function. Asynchronously tries to call
this function with the given arguments on that node.

This function can be used to implement C<spawn>-like interfaces.

=cut

sub snd_to_func($$;@) {
   my $nodeid = shift;

   # on $NODE, we artificially delay... (for spawn)
   # this is very ugly - maybe we should simply delay ALL messages,
   # to avoid deep recursion issues. but that's so... slow...
   $AnyEvent::MP::Node::Self::DELAY = 1
      if $nodeid ne $NODE;

   ($NODE{$nodeid} || add_node $nodeid)->send (["", @_]);
}

=item snd_on $node, @msg

Executes C<snd> with the given C<@msg> (which must include the destination
port) on the given node.

=cut

sub snd_on($@) {
   my $node = shift;
   snd $node, snd => @_;
}

=item eval_on $node, $string[, @reply]

Evaluates the given string as Perl expression on the given node. When
@reply is specified, then it is used to construct a reply message with
C<"$@"> and any results from the eval appended.

=cut

sub eval_on($$;@) {
   my $node = shift;
   snd $node, eval => @_;
}

sub kil(@) {
   my ($nodeid, $portid) = split /#/, shift, 2;

   length $portid
      or Carp::croak "$nodeid#$portid: killing a node port is not allowed, caught";

   ($NODE{$nodeid} || add_node $nodeid)
      ->kill ("$portid", @_);
}

sub _nodename {
   require POSIX;
   (POSIX::uname ())[1]
}

sub _resolve($) {
   my ($nodeid) = @_;

   my $cv = AE::cv;
   my @res;

   $cv->begin (sub {
      my %seen;
      my @refs;
      for (sort { $a->[0] <=> $b->[0] } @res) {
         push @refs, $_->[1] unless $seen{$_->[1]}++
      }
      shift->send (@refs);
   });

   my $idx;
   for my $t (split /,/, $nodeid) {
      my $pri = ++$idx;

      $t = length $t ? _nodename . ":$t" : _nodename
         if $t =~ /^\d*$/;
      
      my ($host, $port) = AnyEvent::Socket::parse_hostport $t, 0
         or Carp::croak "$t: unparsable transport descriptor";

      $port = "0" if $port eq "*";

      if ($host eq "*") {
         $cv->begin;
         # use fork_call, as Net::Interface is big, and we need it rarely.
         require AnyEvent::Util;
         AnyEvent::Util::fork_call (
            sub {
               my @addr;

               require Net::Interface;

               for my $if (Net::Interface->interfaces) {
                  # we statically lower-prioritise ipv6 here, TODO :()
                  for $_ ($if->address (Net::Interface::AF_INET ())) {
                     next if /^\x7f/; # skip localhost etc.
                     push @addr, $_;
                  }
                  for ($if->address (Net::Interface::AF_INET6 ())) {
                     #next if $if->scope ($_) <= 2;
                     next unless /^[\x20-\x3f\xfc\xfd]/; # global unicast, site-local unicast
                     push @addr, $_;
                  }

               }
               @addr
            }, sub {
               for my $ip (@_) {
                  push @res, [
                     $pri += 1e-5,
                     AnyEvent::Socket::format_hostport AnyEvent::Socket::format_address $ip, $port
                  ];
               }
               $cv->end;
            }
         );
      } else {
         $cv->begin;
         AnyEvent::Socket::resolve_sockaddr $host, $port, "tcp", 0, undef, sub {
            for (@_) {
               my ($service, $host) = AnyEvent::Socket::unpack_sockaddr $_->[3];
               push @res, [
                  $pri += 1e-5,
                  AnyEvent::Socket::format_hostport AnyEvent::Socket::format_address $host, $service
               ];
            }
            $cv->end;
         };
      }
   }

   $cv->end;

   $cv
}

sub configure(@) {
   unshift @_, "profile" if @_ & 1;
   my (%kv) = @_;

   my $profile = delete $kv{profile};

   $profile = _nodename
      unless defined $profile;

   $CONFIG = AnyEvent::MP::Config::find_profile $profile, %kv;

   delete $NODE{$NODE}; # we do not support doing stuff before configure

   my $node = exists $CONFIG->{nodeid} ? $CONFIG->{nodeid} : $profile;
   $NODE = $node
      unless $node eq "anon/";

   $NODE{$NODE} = $NODE{""};
   $NODE{$NODE}{id} = $NODE;

   my $seeds = $CONFIG->{seeds};
   my $binds = $CONFIG->{binds};

   $binds ||= ["*"];

   $WARN->(8, "node $NODE starting up.");

   $LISTENER = [];
   %LISTENER = ();

   for (map _resolve $_, @$binds) {
      for my $bind ($_->recv) {
         my ($host, $port) = AnyEvent::Socket::parse_hostport $bind
            or Carp::croak "$bind: unparsable local bind address";

         my $listener = AnyEvent::MP::Transport::mp_server
            $host,
            $port,
            prepare => sub {
               my (undef, $host, $port) = @_;
               $bind = AnyEvent::Socket::format_hostport $host, $port;
            },
         ;
         $LISTENER{$bind} = $listener;
         push @$LISTENER, $bind;
      }
   }

   $WARN->(8, "node listens on [@$LISTENER].");

   # the global service is mandatory currently
   require AnyEvent::MP::Global;

   # connect to all seednodes
   AnyEvent::MP::Global::set_seeds (map $_->recv, map _resolve $_, @$seeds);

   for (@{ $CONFIG->{services} }) {
      if (ref) {
         my ($func, @args) = @$_;
         (load_func $func)->(@args);
      } elsif (s/::$//) {
         eval "require $_";
         die $@ if $@;
      } else {
         (load_func $_)->();
      }
   }
}

#############################################################################
# node monitoring and info

=item node_is_known $nodeid

Returns true iff the given node is currently known to the system. The only
time a node is known but not up currently is when a conenction request is
pending.

=cut

sub node_is_known($) {
   exists $NODE{$_[0]}
}

=item node_is_up $nodeid

Returns true if the given node is "up", that is, the kernel thinks it has
a working connection to it.

If the node is known but not currently connected, returns C<0>. If the
node is not known, returns C<undef>.

=cut

sub node_is_up($) {
   ($NODE{$_[0]} or return)->{transport}
      ? 1 : 0
}

=item known_nodes

Returns the node IDs of all nodes currently known to this node, including
itself and nodes not currently connected.

=cut

sub known_nodes {
   map $_->{id}, values %NODE
}

=item up_nodes

Return the node IDs of all nodes that are currently connected (excluding
the node itself).

=cut

sub up_nodes {
   map $_->{id}, grep $_->{transport}, values %NODE
}

=item $guard = mon_nodes $callback->($nodeid, $is_up, @reason)

Registers a callback that is called each time a node goes up (a connection
is established) or down (the connection is lost).

Node up messages can only be followed by node down messages for the same
node, and vice versa.

Note that monitoring a node is usually better done by monitoring it's node
port. This function is mainly of interest to modules that are concerned
about the network topology and low-level connection handling.

Callbacks I<must not> block and I<should not> send any messages.

The function returns an optional guard which can be used to unregister
the monitoring callback again.

Example: make sure you call function C<newnode> for all nodes that are up
or go up (and down).

   newnode $_, 1 for up_nodes;
   mon_nodes \&newnode;

=cut

our %MON_NODES;

sub mon_nodes($) {
   my ($cb) = @_;

   $MON_NODES{$cb+0} = $cb;

   wantarray && AnyEvent::Util::guard { delete $MON_NODES{$cb+0} }
}

sub _inject_nodeevent($$;@) {
   my ($node, $up, @reason) = @_;

   for my $cb (values %MON_NODES) {
      eval { $cb->($node->{id}, $up, @reason); 1 }
         or $WARN->(1, $@);
   }

   $WARN->(7, "$node->{id} is " . ($up ? "up" : "down") . " (@reason)");
}

#############################################################################
# self node code

our %node_req = (
   # internal services

   # monitoring
   mon0 => sub { # stop monitoring a port
      my $portid = shift;
      my $node   = $SRCNODE;
      $NODE{""}->unmonitor ($portid, delete $node->{rmon}{$portid});
   },
   mon1 => sub { # start monitoring a port
      my $portid = shift;
      my $node   = $SRCNODE;
      Scalar::Util::weaken $node; #TODO# ugly
      $NODE{""}->monitor ($portid, $node->{rmon}{$portid} = sub {
         $node->send (["", kil => $portid, @_])
            if $node && $node->{transport}; #TODO# ugly, should use snd and remove-on-disconnect
      });
   },
   kil => sub {
      my $cbs = delete $SRCNODE->{lmon}{+shift}
         or return;

      $_->(@_) for @$cbs;
   },

   # "public" services - not actually public

   # relay message to another node / generic echo
   snd => \&snd,
   snd_multiple => sub {
      snd @$_ for @_
   },

   # informational
   info => sub {
      snd @_, $NODE;
   },
   known_nodes => sub {
      snd @_, known_nodes;
   },
   up_nodes => sub {
      snd @_, up_nodes;
   },

   # random utilities
   eval => sub {
      my @res = eval shift;
      snd @_, "$@", @res if @_;
   },
   time => sub {
      snd @_, AE::time;
   },
   devnull => sub {
      #
   },
   "" => sub {
      # empty messages are keepalives or similar devnull-applications
   },
);

$NODE{""} = $NODE{$NODE} = new AnyEvent::MP::Node::Self $NODE;
$PORT{""} = sub {
   my $tag = shift;
   eval { &{ $node_req{$tag} ||= load_func $tag } };
   $WARN->(2, "error processing node message: $@") if $@;
};

=back

=head1 SEE ALSO

L<AnyEvent::MP>.

=head1 AUTHOR

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

=cut

1

Revision:	1.48
Committed:	Tue Sep 8 13:46:25 2009 UTC (14 years, 8 months ago) by root
Branch:	MAIN
Changes since 1.47:	+2 -2 lines
Log Message:	* empty log message *
#	Content
1	=head1 NAME
2
3	AnyEvent::MP::Kernel - the actual message passing kernel
4
5	=head1 SYNOPSIS
6
7	use AnyEvent::MP::Kernel;
8
9	=head1 DESCRIPTION
10
11	This module provides most of the basic functionality of AnyEvent::MP,
12	exposed through higher level interfaces such as L<AnyEvent::MP> and
13	L<Coro::MP>.
14
15	This module is mainly of interest when knowledge about connectivity,
16	connected nodes etc. is sought.
17
18	=head1 GLOBALS AND FUNCTIONS
19
20	=over 4
21
22	=cut
23
24	package AnyEvent::MP::Kernel;
25
26	use common::sense;
27	use POSIX ();
28	use Carp ();
29	use MIME::Base64 ();
30
31	use AE ();
32
33	use AnyEvent::MP::Node;
34	use AnyEvent::MP::Transport;
35
36	use base "Exporter";
37
38	our $VERSION = '1.0';
39	our @EXPORT = qw(
40	%NODE %PORT %PORT_DATA $UNIQ $RUNIQ $ID
41	add_node load_func snd_to_func snd_on eval_on
42
43	NODE $NODE node_of snd kil port_is_local
44	configure
45	up_nodes mon_nodes node_is_up
46	);
47
48	=item $AnyEvent::MP::Kernel::WARN->($level, $msg)
49
50	This value is called with an error or warning message, when e.g. a
51	connection could not be created, authorisation failed and so on.
52
53	It I<must not> block or send messages -queue it and use an idle watcher if
54	you need to do any of these things.
55
56	C<$level> should be C<0> for messages to be logged always, C<1> for
57	unexpected messages and errors, C<2> for warnings, C<7> for messages about
58	node connectivity and services, C<8> for debugging messages and C<9> for
59	tracing messages.
60
61	The default simply logs the message to STDERR.
62
63	=item @AnyEvent::MP::Kernel::WARN
64
65	All code references in this array are called for every log message, from
66	the default C<$WARN> handler. This is an easy way to tie into the log
67	messages without disturbing others.
68
69	=cut
70
71	our $WARNLEVEL = exists $ENV{PERL_ANYEVENT_MP_WARNLEVEL} ? $ENV{PERL_ANYEVENT_MP_WARNLEVEL} : 5;
72	our @WARN;
73	our $WARN = sub {
74	&$_ for @WARN;
75
76	return if $WARNLEVEL < $_[0];
77
78	my ($level, $msg) = @_;
79
80	$msg =~ s/\n$//;
81
82	printf STDERR "%s <%d> %s\n",
83	(POSIX::strftime "%Y-%m-%d %H:%M:%S", localtime time),
84	$level,
85	$msg;
86	};
87
88	=item $AnyEvent::MP::Kernel::WARNLEVEL [default 5 or $ENV{PERL_ANYEVENT_MP_WARNLEVEL}]
89
90	The maximum level at which warning messages will be printed to STDERR by
91	the default warn handler.
92
93	=cut
94
95	sub load_func($) {
96	my $func = $_[0];
97
98	unless (defined &$func) {
99	my $pkg = $func;
100	do {
101	$pkg =~ s/::[^:]+$//
102	or return sub { die "unable to resolve '$func'" };
103	eval "require $pkg";
104	} until defined &$func;
105	}
106
107	\&$func
108	}
109
110	sub nonce($) {
111	my $nonce;
112
113	if (open my $fh, "</dev/urandom") {
114	sysread $fh, $nonce, $_[0];
115	} else {
116	# shit...
117	$nonce = join "", map +(chr rand 256), 1 .. $_[0]
118	}
119
120	$nonce
121	}
122
123	sub alnumbits($) {
124	my $data = $_[0];
125
126	if (eval "use Math::GMP 2.05; 1") {
127	$data = Math::GMP::get_str_gmp (
128	(Math::GMP::new_from_scalar_with_base (+(unpack "H*", $data), 16)),
129	62
130	);
131	} else {
132	$data = MIME::Base64::encode_base64 $data, "";
133	$data =~ s/=//;
134	$data =~ s/x/x0/g;
135	$data =~ s/\//x1/g;
136	$data =~ s/\+/x2/g;
137	}
138
139	$data
140	}
141
142	sub gen_uniq {
143	alnumbits pack "nna*", $$ & 0xffff, time & 0xffff, nonce 2
144	}
145
146	our $CONFIG; # this node's configuration
147
148	our $RUNIQ = alnumbits nonce 96/8; # remote uniq value
149	our $UNIQ = gen_uniq; # per-process/node unique cookie
150	our $NODE = "anon/$RUNIQ";
151	our $ID = "a";
152
153	our %NODE; # node id to transport mapping, or "undef", for local node
154	our (%PORT, %PORT_DATA); # local ports
155
156	our %RMON; # local ports monitored by remote nodes ($RMON{nodeid}{portid} == cb)
157	our %LMON; # monitored _local_ ports
158
159	our %LISTENER;
160	our $LISTENER; # our listeners, as arrayref
161
162	our $SRCNODE; # holds the sending node during _inject
163
164	sub NODE() {
165	$NODE
166	}
167
168	sub node_of($) {
169	my ($node, undef) = split /#/, $_[0], 2;
170
171	$node
172	}
173
174	BEGIN {
175	*TRACE = $ENV{PERL_ANYEVENT_MP_TRACE}
176	? sub () { 1 }
177	: sub () { 0 };
178	}
179
180	our $DELAY_TIMER;
181	our @DELAY_QUEUE;
182
183	sub _delay_run {
184	(shift @DELAY_QUEUE or return)->() while 1;
185	}
186
187	sub delay($) {
188	push @DELAY_QUEUE, shift;
189	$DELAY_TIMER \|\|= AE::timer 0, 0, \&_delay_run;
190	}
191
192	sub _inject {
193	warn "RCV $SRCNODE->{id} -> " . eval { JSON::XS->new->encode (\@_) } . "\n" if TRACE && @_;#d#
194	&{ $PORT{+shift} or return };
195	}
196
197	# this function adds a node-ref, so you can send stuff to it
198	# it is basically the central routing component.
199	sub add_node {
200	my ($node) = @_;
201
202	$NODE{$node} \|\|= new AnyEvent::MP::Node::Direct $node
203	}
204
205	sub snd(@) {
206	my ($nodeid, $portid) = split /#/, shift, 2;
207
208	warn "SND $nodeid <- " . eval { JSON::XS->new->encode (\@_) } . "\n" if TRACE && @_;#d#
209
210	($NODE{$nodeid} \|\| add_node $nodeid)
211	->{send} (["$portid", @_]);
212	}
213
214	=item $is_local = port_is_local $port
215
216	Returns true iff the port is a local port.
217
218	=cut
219
220	sub port_is_local($) {
221	my ($nodeid, undef) = split /#/, $_[0], 2;
222
223	$NODE{$nodeid} == $NODE{""}
224	}
225
226	=item snd_to_func $node, $func, @args
227
228	Expects a node ID and a name of a function. Asynchronously tries to call
229	this function with the given arguments on that node.
230
231	This function can be used to implement C<spawn>-like interfaces.
232
233	=cut
234
235	sub snd_to_func($$;@) {
236	my $nodeid = shift;
237
238	# on $NODE, we artificially delay... (for spawn)
239	# this is very ugly - maybe we should simply delay ALL messages,
240	# to avoid deep recursion issues. but that's so... slow...
241	$AnyEvent::MP::Node::Self::DELAY = 1
242	if $nodeid ne $NODE;
243
244	($NODE{$nodeid} \|\| add_node $nodeid)->send (["", @_]);
245	}
246
247	=item snd_on $node, @msg
248
249	Executes C<snd> with the given C<@msg> (which must include the destination
250	port) on the given node.
251
252	=cut
253
254	sub snd_on($@) {
255	my $node = shift;
256	snd $node, snd => @_;
257	}
258
259	=item eval_on $node, $string[, @reply]
260
261	Evaluates the given string as Perl expression on the given node. When
262	@reply is specified, then it is used to construct a reply message with
263	C<"$@"> and any results from the eval appended.
264
265	=cut
266
267	sub eval_on($$;@) {
268	my $node = shift;
269	snd $node, eval => @_;
270	}
271
272	sub kil(@) {
273	my ($nodeid, $portid) = split /#/, shift, 2;
274
275	length $portid
276	or Carp::croak "$nodeid#$portid: killing a node port is not allowed, caught";
277
278	($NODE{$nodeid} \|\| add_node $nodeid)
279	->kill ("$portid", @_);
280	}
281
282	sub _nodename {
283	require POSIX;
284	(POSIX::uname ())[1]
285	}
286
287	sub _resolve($) {
288	my ($nodeid) = @_;
289
290	my $cv = AE::cv;
291	my @res;
292
293	$cv->begin (sub {
294	my %seen;
295	my @refs;
296	for (sort { $a->[0] <=> $b->[0] } @res) {
297	push @refs, $_->[1] unless $seen{$_->[1]}++
298	}
299	shift->send (@refs);
300	});
301
302	my $idx;
303	for my $t (split /,/, $nodeid) {
304	my $pri = ++$idx;
305
306	$t = length $t ? _nodename . ":$t" : _nodename
307	if $t =~ /^\d*$/;
308
309	my ($host, $port) = AnyEvent::Socket::parse_hostport $t, 0
310	or Carp::croak "$t: unparsable transport descriptor";
311
312	$port = "0" if $port eq "*";
313
314	if ($host eq "*") {
315	$cv->begin;
316	# use fork_call, as Net::Interface is big, and we need it rarely.
317	require AnyEvent::Util;
318	AnyEvent::Util::fork_call (
319	sub {
320	my @addr;
321
322	require Net::Interface;
323
324	for my $if (Net::Interface->interfaces) {
325	# we statically lower-prioritise ipv6 here, TODO :()
326	for $_ ($if->address (Net::Interface::AF_INET ())) {
327	next if /^\x7f/; # skip localhost etc.
328	push @addr, $_;
329	}
330	for ($if->address (Net::Interface::AF_INET6 ())) {
331	#next if $if->scope ($_) <= 2;
332	next unless /^[\x20-\x3f\xfc\xfd]/; # global unicast, site-local unicast
333	push @addr, $_;
334	}
335
336	}
337	@addr
338	}, sub {
339	for my $ip (@_) {
340	push @res, [
341	$pri += 1e-5,
342	AnyEvent::Socket::format_hostport AnyEvent::Socket::format_address $ip, $port
343	];
344	}
345	$cv->end;
346	}
347	);
348	} else {
349	$cv->begin;
350	AnyEvent::Socket::resolve_sockaddr $host, $port, "tcp", 0, undef, sub {
351	for (@_) {
352	my ($service, $host) = AnyEvent::Socket::unpack_sockaddr $_->[3];
353	push @res, [
354	$pri += 1e-5,
355	AnyEvent::Socket::format_hostport AnyEvent::Socket::format_address $host, $service
356	];
357	}
358	$cv->end;
359	};
360	}
361	}
362
363	$cv->end;
364
365	$cv
366	}
367
368	sub configure(@) {
369	unshift @_, "profile" if @_ & 1;
370	my (%kv) = @_;
371
372	my $profile = delete $kv{profile};
373
374	$profile = _nodename
375	unless defined $profile;
376
377	$CONFIG = AnyEvent::MP::Config::find_profile $profile, %kv;
378
379	delete $NODE{$NODE}; # we do not support doing stuff before configure
380
381	my $node = exists $CONFIG->{nodeid} ? $CONFIG->{nodeid} : $profile;
382	$NODE = $node
383	unless $node eq "anon/";
384
385	$NODE{$NODE} = $NODE{""};
386	$NODE{$NODE}{id} = $NODE;
387
388	my $seeds = $CONFIG->{seeds};
389	my $binds = $CONFIG->{binds};
390
391	$binds \|\|= ["*"];
392
393	$WARN->(8, "node $NODE starting up.");
394
395	$LISTENER = [];
396	%LISTENER = ();
397
398	for (map _resolve $_, @$binds) {
399	for my $bind ($_->recv) {
400	my ($host, $port) = AnyEvent::Socket::parse_hostport $bind
401	or Carp::croak "$bind: unparsable local bind address";
402
403	my $listener = AnyEvent::MP::Transport::mp_server
404	$host,
405	$port,
406	prepare => sub {
407	my (undef, $host, $port) = @_;
408	$bind = AnyEvent::Socket::format_hostport $host, $port;
409	},
410	;
411	$LISTENER{$bind} = $listener;
412	push @$LISTENER, $bind;
413	}
414	}
415
416	$WARN->(8, "node listens on [@$LISTENER].");
417
418	# the global service is mandatory currently
419	require AnyEvent::MP::Global;
420
421	# connect to all seednodes
422	AnyEvent::MP::Global::set_seeds (map $_->recv, map _resolve $_, @$seeds);
423
424	for (@{ $CONFIG->{services} }) {
425	if (ref) {
426	my ($func, @args) = @$_;
427	(load_func $func)->(@args);
428	} elsif (s/::$//) {
429	eval "require $_";
430	die $@ if $@;
431	} else {
432	(load_func $_)->();
433	}
434	}
435	}
436
437	#############################################################################
438	# node monitoring and info
439
440	=item node_is_known $nodeid
441
442	Returns true iff the given node is currently known to the system. The only
443	time a node is known but not up currently is when a conenction request is
444	pending.
445
446	=cut
447
448	sub node_is_known($) {
449	exists $NODE{$_[0]}
450	}
451
452	=item node_is_up $nodeid
453
454	Returns true if the given node is "up", that is, the kernel thinks it has
455	a working connection to it.
456
457	If the node is known but not currently connected, returns C<0>. If the
458	node is not known, returns C<undef>.
459
460	=cut
461
462	sub node_is_up($) {
463	($NODE{$_[0]} or return)->{transport}
464	? 1 : 0
465	}
466
467	=item known_nodes
468
469	Returns the node IDs of all nodes currently known to this node, including
470	itself and nodes not currently connected.
471
472	=cut
473
474	sub known_nodes {
475	map $_->{id}, values %NODE
476	}
477
478	=item up_nodes
479
480	Return the node IDs of all nodes that are currently connected (excluding
481	the node itself).
482
483	=cut
484
485	sub up_nodes {
486	map $_->{id}, grep $_->{transport}, values %NODE
487	}
488
489	=item $guard = mon_nodes $callback->($nodeid, $is_up, @reason)
490
491	Registers a callback that is called each time a node goes up (a connection
492	is established) or down (the connection is lost).
493
494	Node up messages can only be followed by node down messages for the same
495	node, and vice versa.
496
497	Note that monitoring a node is usually better done by monitoring it's node
498	port. This function is mainly of interest to modules that are concerned
499	about the network topology and low-level connection handling.
500
501	Callbacks I<must not> block and I<should not> send any messages.
502
503	The function returns an optional guard which can be used to unregister
504	the monitoring callback again.
505
506	Example: make sure you call function C<newnode> for all nodes that are up
507	or go up (and down).
508
509	newnode $_, 1 for up_nodes;
510	mon_nodes \&newnode;
511
512	=cut
513
514	our %MON_NODES;
515
516	sub mon_nodes($) {
517	my ($cb) = @_;
518
519	$MON_NODES{$cb+0} = $cb;
520
521	wantarray && AnyEvent::Util::guard { delete $MON_NODES{$cb+0} }
522	}
523
524	sub _inject_nodeevent($$;@) {
525	my ($node, $up, @reason) = @_;
526
527	for my $cb (values %MON_NODES) {
528	eval { $cb->($node->{id}, $up, @reason); 1 }
529	or $WARN->(1, $@);
530	}
531
532	$WARN->(7, "$node->{id} is " . ($up ? "up" : "down") . " (@reason)");
533	}
534
535	#############################################################################
536	# self node code
537
538	our %node_req = (
539	# internal services
540
541	# monitoring
542	mon0 => sub { # stop monitoring a port
543	my $portid = shift;
544	my $node = $SRCNODE;
545	$NODE{""}->unmonitor ($portid, delete $node->{rmon}{$portid});
546	},
547	mon1 => sub { # start monitoring a port
548	my $portid = shift;
549	my $node = $SRCNODE;
550	Scalar::Util::weaken $node; #TODO# ugly
551	$NODE{""}->monitor ($portid, $node->{rmon}{$portid} = sub {
552	$node->send (["", kil => $portid, @_])
553	if $node && $node->{transport}; #TODO# ugly, should use snd and remove-on-disconnect
554	});
555	},
556	kil => sub {
557	my $cbs = delete $SRCNODE->{lmon}{+shift}
558	or return;
559
560	$_->(@_) for @$cbs;
561	},
562
563	# "public" services - not actually public
564
565	# relay message to another node / generic echo
566	snd => \&snd,
567	snd_multiple => sub {
568	snd @$_ for @_
569	},
570
571	# informational
572	info => sub {
573	snd @_, $NODE;
574	},
575	known_nodes => sub {
576	snd @_, known_nodes;
577	},
578	up_nodes => sub {
579	snd @_, up_nodes;
580	},
581
582	# random utilities
583	eval => sub {
584	my @res = eval shift;
585	snd @_, "$@", @res if @_;
586	},
587	time => sub {
588	snd @_, AE::time;
589	},
590	devnull => sub {
591	#
592	},
593	"" => sub {
594	# empty messages are keepalives or similar devnull-applications
595	},
596	);
597
598	$NODE{""} = $NODE{$NODE} = new AnyEvent::MP::Node::Self $NODE;
599	$PORT{""} = sub {
600	my $tag = shift;
601	eval { &{ $node_req{$tag} \|\|= load_func $tag } };
602	$WARN->(2, "error processing node message: $@") if $@;
603	};
604
605	=back
606
607	=head1 SEE ALSO
608
609	L<AnyEvent::MP>.
610
611	=head1 AUTHOR
612
613	Marc Lehmann <schmorp@schmorp.de>
614	http://home.schmorp.de/
615
616	=cut
617
618	1
619