[ViewVC] Diff of: cvs/AnyEvent-MP/MP.pm

Comparing AnyEvent-MP/MP.pm (file contents):
Revision 1.3 by root, Sat Aug 1 07:11:45 2009 UTC vs.
Revision 1.11 by root, Sun Aug 2 18:08:38 2009 UTC

…		…
27	This module (-family) implements a simple message passing framework.	27	This module (-family) implements a simple message passing framework.
28		28
29	Despite its simplicity, you can securely message other processes running	29	Despite its simplicity, you can securely message other processes running
30	on the same or other hosts.	30	on the same or other hosts.
31		31
		32	At the moment, this module family is severly brokena nd underdocumented,
		33	so do not use. This was uploaded mainly to resreve the CPAN namespace -
		34	stay tuned!
		35
32	=head1 CONCEPTS	36	=head1 CONCEPTS
33		37
34	=over 4	38	=over 4
35		39
36	=item port	40	=item port
…		…
52		56
53	Initially, nodes are either private (single-process only) or hidden	57	Initially, nodes are either private (single-process only) or hidden
54	(connected to a master node only). Only when they epxlicitly "become	58	(connected to a master node only). Only when they epxlicitly "become
55	public" can you send them messages from unrelated other nodes.	59	public" can you send them messages from unrelated other nodes.
56		60
57	=item noderef - C<host:port,host:port...>, C<id@noderef, C<id>	61	=item noderef - C<host:port,host:port...>, C<id@noderef>, C<id>
58		62
59	A noderef is a string that either uniquely identifies a given node (for	63	A noderef is a string that either uniquely identifies a given node (for
60	private and hidden nodes), or contains a recipe on how to reach a given	64	private and hidden nodes), or contains a recipe on how to reach a given
61	node (for public nodes).	65	node (for public nodes).
62		66
…		…
68		72
69	=cut	73	=cut
70		74
71	package AnyEvent::MP;	75	package AnyEvent::MP;
72		76
73	use AnyEvent::MP::Util ();
74	use AnyEvent::MP::Node;	77	use AnyEvent::MP::Base;
75	use AnyEvent::MP::Transport;
76		78
77	use utf8;
78	use common::sense;	79	use common::sense;
79		80
80	use Carp ();	81	use Carp ();
81		82
82	use AE ();	83	use AE ();
83		84
84	use base "Exporter";	85	use base "Exporter";
85		86
86	our $VERSION = '0.0';	87	our $VERSION = '0.02';
87	our @EXPORT = qw(NODE $NODE $PORT snd rcv _any_);	88	our @EXPORT = qw(
88		89	NODE $NODE $PORT snd rcv _any_
89	our $DEFAULT_SECRET;	90	create_port create_port_on
90	our $DEFAULT_PORT = "4040";	91	create_miniport
91		92	become_slave become_public
92	our $CONNECT_INTERVAL = 5; # new connect every 5s, at least	93	);
93	our $CONNECT_TIMEOUT = 30; # includes handshake
94
95	sub default_secret {
96	unless (defined $DEFAULT_SECRET) {
97	if (open my $fh, "<$ENV{HOME}/.aemp-secret") {
98	sysread $fh, $DEFAULT_SECRET, -s $fh;
99	} else {
100	$DEFAULT_SECRET = AnyEvent::MP::Util::nonce 32;
101	}
102	}
103
104	$DEFAULT_SECRET
105	}
106		94
107	=item NODE / $NODE	95	=item NODE / $NODE
108		96
109	The C<NODE ()> function and the C<$NODE> variable contain the noderef of	97	The C<NODE ()> function and the C<$NODE> variable contain the noderef of
110	the local node. The value is initialised by a call to C<become_public> or	98	the local node. The value is initialised by a call to C<become_public> or
111	C<become_slave>, after which all local port identifiers become invalid.	99	C<become_slave>, after which all local port identifiers become invalid.
112		100
113	=cut
114
115	our $UNIQ = sprintf "%x.%x", $$, time; # per-process/node unique cookie
116	our $PUBLIC = 0;
117	our $NODE;
118	our $PORT;
119
120	our %NODE; # node id to transport mapping, or "undef", for local node
121	our %PORT; # local ports
122	our %LISTENER; # local transports
123
124	sub NODE() { $NODE }
125
126	{
127	use POSIX ();
128	my $nodename = (POSIX::uname)[1];
129	$NODE = "$$\@$nodename";
130	}
131
132	sub _ANY_() { 1 }
133	sub _any_() { \&_ANY_ }
134
135	sub add_node {
136	my ($noderef) = @_;
137
138	return $NODE{$noderef}
139	if exists $NODE{$noderef};
140
141	for (split /,/, $noderef) {
142	return $NODE{$noderef} = $NODE{$_}
143	if exists $NODE{$_};
144	}
145
146	# for indirect sends, use a different class
147	my $node = new AnyEvent::MP::Node::Direct $noderef;
148
149	$NODE{$_} = $node
150	for $noderef, split /,/, $noderef;
151
152	$node
153	}
154
155	=item snd $portid, type => @data	101	=item snd $portid, type => @data
156		102
157	=item snd $portid, @msg	103	=item snd $portid, @msg
158		104
159	Send the given message to the given port ID, which can identify either a	105	Send the given message to the given port ID, which can identify either
160	local or a remote port.	106	a local or a remote port, and can be either a string or soemthignt hat
		107	stringifies a sa port ID (such as a port object :).
161		108
162	While the message can be about anything, it is highly recommended to use	109	While the message can be about anything, it is highly recommended to use a
163	a constant string as first element.	110	string as first element (a portid, or some word that indicates a request
		111	type etc.).
164		112
165	The message data effectively becomes read-only after a call to this	113	The message data effectively becomes read-only after a call to this
166	function: modifying any argument is not allowed and can cause many	114	function: modifying any argument is not allowed and can cause many
167	problems.	115	problems.
168		116
…		…
170	JSON is used, then only strings, numbers and arrays and hashes consisting	118	JSON is used, then only strings, numbers and arrays and hashes consisting
171	of those are allowed (no objects). When Storable is used, then anything	119	of those are allowed (no objects). When Storable is used, then anything
172	that Storable can serialise and deserialise is allowed, and for the local	120	that Storable can serialise and deserialise is allowed, and for the local
173	node, anything can be passed.	121	node, anything can be passed.
174		122
175	=cut	123	=item $local_port = create_port
176		124
177	sub snd($@) {	125	Create a new local port object. See the next section for allowed methods.
178	my ($noderef, $port) = split /#/, shift, 2;
179		126
180	add_node $noderef	127	=cut
181	unless exists $NODE{$noderef};
182		128
183	$NODE{$noderef}->send (["$port", [@_]]);	129	sub create_port {
184	}	130	my $id = "$AnyEvent::MP::Base::UNIQ." . ++$AnyEvent::MP::Base::ID;
185		131
		132	my $self = bless {
		133	id => "$NODE#$id",
		134	names => [$id],
		135	}, "AnyEvent::MP::Port";
		136
		137	$AnyEvent::MP::Base::PORT{$id} = sub {
		138	unshift @_, $self;
		139
		140	for (@{ $self->{rc0}{$_[1]} }) {
		141	$_ && &{$_->[0]}
		142	&& undef $_;
		143	}
		144
		145	for (@{ $self->{rcv}{$_[1]} }) {
		146	$_ && [@_[1 .. @{$_->[1]}]] ~~ $_->[1]
		147	&& &{$_->[0]}
		148	&& undef $_;
		149	}
		150
		151	for (@{ $self->{any} }) {
		152	$_ && [@_[0 .. $#{$_->[1]}]] ~~ $_->[1]
		153	&& &{$_->[0]}
		154	&& undef $_;
		155	}
		156	};
		157
		158	$self
		159	}
		160
		161	=item $portid = create_miniport { }
		162
		163	Creates a "mini port", that is, a port without much #TODO
		164
		165	=cut
		166
		167	sub create_miniport(&) {
		168	my $cb = shift;
		169	my $id = "$AnyEvent::MP::Base::UNIQ." . ++$AnyEvent::MP::Base::ID;
		170
		171	$AnyEvent::MP::Base::PORT{$id} = sub {
		172	&$cb
		173	and delete $AnyEvent::MP::Base::PORT{$id};
		174	};
		175
		176	"$NODE#$id"
		177	}
		178
		179	package AnyEvent::MP::Port;
		180
		181	=back
		182
		183	=head1 METHODS FOR PORT OBJECTS
		184
		185	=over 4
		186
		187	=item "$port"
		188
		189	A port object stringifies to its port ID, so can be used directly for
		190	C<snd> operations.
		191
		192	=cut
		193
		194	use overload
		195	'""' => sub { $_[0]{id} },
		196	fallback => 1;
		197
186	=item rcv $portid, type => $callback->(@msg)	198	=item $port->rcv (type => $callback->($port, @msg))
187		199
188	=item rcv $portid, $smartmatch => $callback->(@msg)	200	=item $port->rcv ($smartmatch => $callback->($port, @msg))
189		201
190	=item rcv $portid, [$smartmatch...] => $callback->(@msg)	202	=item $port->rcv ([$smartmatch...] => $callback->($port, @msg))
191		203
192	Register a callback on the port identified by C<$portid>, which I<must> be	204	Register a callback on the given port.
193	a local port.
194		205
195	The callback has to return a true value when its work is done, after	206	The callback has to return a true value when its work is done, after
196	which is will be removed, or a false value in which case it will stay	207	which is will be removed, or a false value in which case it will stay
197	registered.	208	registered.
198		209
…		…
208	also the most efficient match (by far).	219	also the most efficient match (by far).
209		220
210	=cut	221	=cut
211		222
212	sub rcv($@) {	223	sub rcv($@) {
213	my ($port, $match, $cb) = @_;	224	my ($self, $match, $cb) = @_;
214
215	my $port = $PORT{$port}
216	or do {
217	my ($noderef, $lport) = split /#/, $port;
218	"AnyEvent::MP::Node::Self" eq ref $NODE{$noderef}
219	or Carp::croak "$port: can only rcv on local ports";
220
221	$PORT{$lport}
222	or Carp::croak "$port: port does not exist";
223
224	$PORT{$port} = $PORT{$lport} # also return
225	};
226		225
227	if (!ref $match) {	226	if (!ref $match) {
228	push @{ $port->{rc0}{$match} }, [$cb];	227	push @{ $self->{rc0}{$match} }, [$cb];
229	} elsif (("ARRAY" eq ref $match && !ref $match->[0])) {	228	} elsif (("ARRAY" eq ref $match && !ref $match->[0])) {
230	my ($type, @match) = @$match;	229	my ($type, @match) = @$match;
231	@match	230	@match
232	? push @{ $port->{rcv}{$match->[0]} }, [$cb, \@match]	231	? push @{ $self->{rcv}{$match->[0]} }, [$cb, \@match]
233	: push @{ $port->{rc0}{$match->[0]} }, [$cb];	232	: push @{ $self->{rc0}{$match->[0]} }, [$cb];
234	} else {	233	} else {
235	push @{ $port->{any} }, [$cb, $match];	234	push @{ $self->{any} }, [$cb, $match];
236	}	235	}
237	}	236	}
238		237
239	sub _inject {	238	=item $port->register ($name)
240	my ($port, $msg) = @{+shift};
241		239
242	$port = $PORT{$port}	240	Registers the given port under the well known name C<$name>. If the name
243	or return;	241	already exists it is replaced.
244		242
245	@_ = @$msg;	243	A port can only be registered under one well known name.
246		244
247	for (@{ $port->{rc0}{$msg->[0]} }) {	245	=cut
248	$_ && &{$_->[0]}
249	&& undef $_;
250	}
251		246
252	for (@{ $port->{rcv}{$msg->[0]} }) {	247	sub register {
253	$_ && [@_[1..$#{$_->[1]}]] ~~ $_->[1]
254	&& &{$_->[0]}
255	&& undef $_;
256	}
257
258	for (@{ $port->{any} }) {
259	$_ && [@_[0..$#{$_->[1]}]] ~~ $_->[1]
260	&& &{$_->[0]}
261	&& undef $_;
262	}
263	}
264
265	sub normalise_noderef($) {
266	my ($noderef) = @_;
267
268	my $cv = AE::cv;
269	my @res;
270
271	$cv->begin (sub {
272	my %seen;
273	my @refs;
274	for (sort { $a->[0] <=> $b->[0] } @res) {
275	push @refs, $_->[1] unless $seen{$_->[1]}++
276	}
277	shift->send (join ",", @refs);
278	});
279
280	$noderef = $DEFAULT_PORT unless length $noderef;
281
282	my $idx;
283	for my $t (split /,/, $noderef) {
284	my $pri = ++$idx;
285
286	#TODO: this should be outside normalise_noderef and in become_public
287	if ($t =~ /^\d*$/) {
288	my $nodename = (POSIX::uname)[1];
289
290	$cv->begin;
291	AnyEvent::Socket::resolve_sockaddr $nodename, $t \|\| "aemp=$DEFAULT_PORT", "tcp", 0, undef, sub {
292	for (@_) {
293	my ($service, $host) = AnyEvent::Socket::unpack_sockaddr $_->[3];
294	push @res, [
295	$pri += 1e-5,
296	AnyEvent::Socket::format_hostport AnyEvent::Socket::format_address $host, $service
297	];
298	}
299	$cv->end;
300	};
301
302	# my (undef, undef, undef, undef, @ipv4) = gethostbyname $nodename;
303	#
304	# for (@ipv4) {
305	# push @res, [
306	# $pri,
307	# AnyEvent::Socket::format_hostport AnyEvent::Socket::format_address $_, $t \|\| $DEFAULT_PORT,
308	# ];
309	# }
310	} else {
311	my ($host, $port) = AnyEvent::Socket::parse_hostport $t, "aemp=$DEFAULT_PORT"
312	or Carp::croak "$t: unparsable transport descriptor";
313
314	$cv->begin;
315	AnyEvent::Socket::resolve_sockaddr $host, $port, "tcp", 0, undef, sub {
316	for (@_) {
317	my ($service, $host) = AnyEvent::Socket::unpack_sockaddr $_->[3];
318	push @res, [
319	$pri += 1e-5,
320	AnyEvent::Socket::format_hostport AnyEvent::Socket::format_address $host, $service
321	];
322	}
323	$cv->end;
324	}
325	}
326	}
327
328	$cv->end;
329
330	$cv
331	}
332
333	sub become_public {
334	return if $PUBLIC;
335
336	my $noderef = join ",", ref $_[0] ? @{+shift} : shift;
337	my @args = @_;
338
339	$NODE = (normalise_noderef $noderef)->recv;
340
341	for my $t (split /,/, $NODE) {
342	$NODE{$t} = $NODE{""};
343
344	my ($host, $port) = AnyEvent::Socket::parse_hostport $t;
345
346	$LISTENER{$t} = AnyEvent::MP::Transport::mp_server $host, $port,
347	@args,
348	on_error => sub {
349	die "on_error<@_>\n";#d#
350	},
351	on_connect => sub {
352	my ($tp) = @_;
353
354	$NODE{$tp->{remote_id}} = $_[0];
355	},
356	sub {
357	my ($tp) = @_;
358
359	$NODE{"$tp->{peerhost}:$tp->{peerport}"} = $tp;
360	},
361	;
362	}
363
364	$PUBLIC = 1;
365	}
366
367	#############################################################################
368	# self node code
369
370	sub _new_port($) {
371	my ($name) = @_;	248	my ($self, $name) = @_;
372		249
373	my ($noderef, $portname) = split /#/, $name;	250	$self->{wkname} = $name;
374		251	$AnyEvent::MP::Base::WKP{$name} = "$self";
375	$PORT{$name} =
376	$PORT{$portname} = {
377	names => [$name, $portname],
378	};
379	}	252	}
380		253
381	$NODE{""} = new AnyEvent::MP::Node::Self noderef => $NODE;	254	=item $port->destroy
382	_new_port "";
383		255
384	rcv "", relay => \&snd;	256	Explicitly destroy/remove/nuke/vaporise the port.
		257
		258	Ports are normally kept alive by there mere existance alone, and need to
		259	be destroyed explicitly.
		260
		261	=cut
		262
		263	sub destroy {
		264	my ($self) = @_;
		265
		266	delete $AnyEvent::MP::Base::WKP{ $self->{wkname} };
		267
		268	delete $AnyEvent::MP::Base::PORT{$_}
		269	for @{ $self->{names} };
		270	}
		271
		272	=back
		273
		274	=head1 FUNCTIONS FOR NODES
		275
		276	=over 4
		277
		278	=item mon $noderef, $callback->($noderef, $status, $)
		279
		280	Monitors the given noderef.
		281
		282	=item become_public endpoint...
		283
		284	Tells the node to become a public node, i.e. reachable from other nodes.
		285
		286	If no arguments are given, or the first argument is C<undef>, then
		287	AnyEvent::MP tries to bind on port C<4040> on all IP addresses that the
		288	local nodename resolves to.
		289
		290	Otherwise the first argument must be an array-reference with transport
		291	endpoints ("ip:port", "hostname:port") or port numbers (in which case the
		292	local nodename is used as hostname). The endpoints are all resolved and
		293	will become the node reference.
		294
		295	=cut
		296
		297	=back
		298
		299	=head1 NODE MESSAGES
		300
		301	Nodes understand the following messages sent to them. Many of them take
		302	arguments called C<@reply>, which will simply be used to compose a reply
		303	message - C<$reply[0]> is the port to reply to, C<$reply[1]> the type and
		304	the remaining arguments are simply the message data.
		305
		306	=over 4
		307
		308	=cut
		309
		310	=item wkp => $name, @reply
		311
		312	Replies with the port ID of the specified well-known port, or C<undef>.
		313
		314	=item devnull => ...
		315
		316	Generic data sink/CPU heat conversion.
		317
		318	=item relay => $port, @msg
		319
		320	Simply forwards the message to the given port.
		321
		322	=item eval => $string[ @reply]
		323
		324	Evaluates the given string. If C<@reply> is given, then a message of the
		325	form C<@reply, $@, @evalres> is sent.
		326
		327	Example: crash another node.
		328
		329	snd $othernode, eval => "exit";
		330
		331	=item time => @reply
		332
		333	Replies the the current node time to C<@reply>.
		334
		335	Example: tell the current node to send the current time to C<$myport> in a
		336	C<timereply> message.
		337
		338	snd $NODE, time => $myport, timereply => 1, 2;
		339	# => snd $myport, timereply => 1, 2, <time>
385		340
386	=back	341	=back
387		342
388	=head1 SEE ALSO	343	=head1 SEE ALSO
389		344

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Comparing AnyEvent-MP/MP.pm (file contents): Revision 1.3 by root, Sat Aug 1 07:11:45 2009 UTC vs. Revision 1.11 by root, Sun Aug 2 18:08:38 2009 UTC

Diff Legend

Comparing AnyEvent-MP/MP.pm (file contents):
Revision 1.3 by root, Sat Aug 1 07:11:45 2009 UTC vs.
Revision 1.11 by root, Sun Aug 2 18:08:38 2009 UTC