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

Comparing AnyEvent-MP/MP.pm (file contents):
Revision 1.4 by root, Sat Aug 1 07:36:30 2009 UTC vs.
Revision 1.9 by root, Sun Aug 2 15:47:04 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	become_slave become_public
91		92	);
92	our $CONNECT_INTERVAL = 5; # new connect every 5s, at least
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		93
107	=item NODE / $NODE	94	=item NODE / $NODE
108		95
109	The C<NODE ()> function and the C<$NODE> variable contain the noderef of	96	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	97	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.	98	C<become_slave>, after which all local port identifiers become invalid.
112		99
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	100	=item snd $portid, type => @data
156		101
157	=item snd $portid, @msg	102	=item snd $portid, @msg
158		103
159	Send the given message to the given port ID, which can identify either a	104	Send the given message to the given port ID, which can identify either
160	local or a remote port.	105	a local or a remote port, and can be either a string or soemthignt hat
		106	stringifies a sa port ID (such as a port object :).
161		107
162	While the message can be about anything, it is highly recommended to use	108	While the message can be about anything, it is highly recommended to use a
163	a constant string as first element.	109	string as first element (a portid, or some word that indicates a request
		110	type etc.).
164		111
165	The message data effectively becomes read-only after a call to this	112	The message data effectively becomes read-only after a call to this
166	function: modifying any argument is not allowed and can cause many	113	function: modifying any argument is not allowed and can cause many
167	problems.	114	problems.
168		115
…		…
170	JSON is used, then only strings, numbers and arrays and hashes consisting	117	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	118	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	119	that Storable can serialise and deserialise is allowed, and for the local
173	node, anything can be passed.	120	node, anything can be passed.
174		121
175	=cut	122	=item $local_port = create_port
176		123
177	sub snd(@) {	124	Create a new local port object. See the next section for allowed methods.
178	my ($noderef, $port) = split /#/, shift, 2;
179		125
180	add_node $noderef	126	=cut
181	unless exists $NODE{$noderef};
182		127
183	$NODE{$noderef}->send (["$port", [@_]]);	128	sub create_port {
		129	my $id = "$AnyEvent::MP::Base::UNIQ." . ++$AnyEvent::MP::Base::ID;
		130
		131	my $self = bless {
		132	id => "$NODE#$id",
		133	names => [$id],
		134	}, "AnyEvent::MP::Port";
		135
		136	$AnyEvent::MP::Base::PORT{$id} = sub {
		137	unshift @_, $self;
		138
		139	for (@{ $self->{rc0}{$_[1]} }) {
		140	$_ && &{$_->[0]}
		141	&& undef $_;
		142	}
		143
		144	for (@{ $self->{rcv}{$_[1]} }) {
		145	$_ && [@_[1 .. @{$_->[1]}]] ~~ $_->[1]
		146	&& &{$_->[0]}
		147	&& undef $_;
		148	}
		149
		150	for (@{ $self->{any} }) {
		151	$_ && [@_[0 .. $#{$_->[1]}]] ~~ $_->[1]
		152	&& &{$_->[0]}
		153	&& undef $_;
		154	}
		155	};
		156
		157	$self
184	}	158	}
185		159
		160	package AnyEvent::MP::Port;
		161
		162	=back
		163
		164	=head1 METHODS FOR PORT OBJECTS
		165
		166	=over 4
		167
		168	=item "$port"
		169
		170	A port object stringifies to its port ID, so can be used directly for
		171	C<snd> operations.
		172
		173	=cut
		174
		175	use overload
		176	'""' => sub { $_[0]{id} },
		177	fallback => 1;
		178
186	=item rcv $portid, type => $callback->(@msg)	179	=item $port->rcv (type => $callback->($port, @msg))
187		180
188	=item rcv $portid, $smartmatch => $callback->(@msg)	181	=item $port->rcv ($smartmatch => $callback->($port, @msg))
189		182
190	=item rcv $portid, [$smartmatch...] => $callback->(@msg)	183	=item $port->rcv ([$smartmatch...] => $callback->($port, @msg))
191		184
192	Register a callback on the port identified by C<$portid>, which I<must> be	185	Register a callback on the given port.
193	a local port.
194		186
195	The callback has to return a true value when its work is done, after	187	The callback has to return a true value when its work is done, after
196	which is will be removed, or a false value in which case it will stay	188	which is will be removed, or a false value in which case it will stay
197	registered.	189	registered.
198		190
…		…
208	also the most efficient match (by far).	200	also the most efficient match (by far).
209		201
210	=cut	202	=cut
211		203
212	sub rcv($@) {	204	sub rcv($@) {
213	my ($port, $match, $cb) = @_;	205	my ($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		206
227	if (!ref $match) {	207	if (!ref $match) {
228	push @{ $port->{rc0}{$match} }, [$cb];	208	push @{ $self->{rc0}{$match} }, [$cb];
229	} elsif (("ARRAY" eq ref $match && !ref $match->[0])) {	209	} elsif (("ARRAY" eq ref $match && !ref $match->[0])) {
230	my ($type, @match) = @$match;	210	my ($type, @match) = @$match;
231	@match	211	@match
232	? push @{ $port->{rcv}{$match->[0]} }, [$cb, \@match]	212	? push @{ $self->{rcv}{$match->[0]} }, [$cb, \@match]
233	: push @{ $port->{rc0}{$match->[0]} }, [$cb];	213	: push @{ $self->{rc0}{$match->[0]} }, [$cb];
234	} else {	214	} else {
235	push @{ $port->{any} }, [$cb, $match];	215	push @{ $self->{any} }, [$cb, $match];
236	}	216	}
237	}	217	}
238		218
239	sub _inject {	219	=item $port->register ($name)
240	my ($port, $msg) = @{+shift};
241		220
242	$port = $PORT{$port}	221	Registers the given port under the well known name C<$name>. If the name
243	or return;	222	already exists it is replaced.
244		223
245	@_ = @$msg;	224	A port can only be registered under one well known name.
246		225
247	for (@{ $port->{rc0}{$msg->[0]} }) {	226	=cut
248	$_ && &{$_->[0]}
249	&& undef $_;
250	}
251		227
252	for (@{ $port->{rcv}{$msg->[0]} }) {	228	sub register {
253	$_ && [@_[1..$#{$_->[1]}]] ~~ $_->[1]	229	my ($self, $name) = @_;
254	&& &{$_->[0]}
255	&& undef $_;
256	}
257		230
258	for (@{ $port->{any} }) {	231	$self->{wkname} = $name;
259	$_ && [@_[0..$#{$_->[1]}]] ~~ $_->[1]	232	$AnyEvent::MP::Base::WKP{$name} = "$self";
260	&& &{$_->[0]}
261	&& undef $_;
262	}
263	}	233	}
264		234
265	sub normalise_noderef($) {	235	=item $port->destroy
		236
		237	Explicitly destroy/remove/nuke/vaporise the port.
		238
		239	Ports are normally kept alive by there mere existance alone, and need to
		240	be destroyed explicitly.
		241
		242	=cut
		243
		244	sub destroy {
266	my ($noderef) = @_;	245	my ($self) = @_;
267		246
268	my $cv = AE::cv;	247	delete $AnyEvent::MP::Base::WKP{ $self->{wkname} };
269	my @res;
270		248
271	$cv->begin (sub {	249	delete $AnyEvent::MP::Base::PORT{$_}
272	my %seen;	250	for @{ $self->{names} };
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	}	251	}
332		252
333	sub become_public {	253	=back
334	return if $PUBLIC;
335		254
336	my $noderef = join ",", ref $_[0] ? @{+shift} : shift;	255	=head1 FUNCTIONS FOR NODES
337	my @args = @_;
338		256
339	$NODE = (normalise_noderef $noderef)->recv;	257	=over 4
340		258
341	for my $t (split /,/, $NODE) {	259	=item mon $noderef, $callback->($noderef, $status, $)
342	$NODE{$t} = $NODE{""};
343		260
344	my ($host, $port) = AnyEvent::Socket::parse_hostport $t;	261	Monitors the given noderef.
345		262
346	$LISTENER{$t} = AnyEvent::MP::Transport::mp_server $host, $port,	263	=item become_public endpoint...
347	@args,
348	on_error => sub {
349	die "on_error<@_>\n";#d#
350	},
351	on_connect => sub {
352	my ($tp) = @_;
353		264
354	$NODE{$tp->{remote_id}} = $_[0];	265	Tells the node to become a public node, i.e. reachable from other nodes.
355	},
356	sub {
357	my ($tp) = @_;
358		266
359	$NODE{"$tp->{peerhost}:$tp->{peerport}"} = $tp;	267	If no arguments are given, or the first argument is C<undef>, then
360	},	268	AnyEvent::MP tries to bind on port C<4040> on all IP addresses that the
361	;	269	local nodename resolves to.
362	}
363		270
364	$PUBLIC = 1;	271	Otherwise the first argument must be an array-reference with transport
365	}	272	endpoints ("ip:port", "hostname:port") or port numbers (in which case the
		273	local nodename is used as hostname). The endpoints are all resolved and
		274	will become the node reference.
		275
		276	=cut
366		277
367	=back	278	=back
368		279
369	=head1 NODE MESSAGES	280	=head1 NODE MESSAGES
370		281
371	Nodes understand the following messages sent to them:	282	Nodes understand the following messages sent to them. Many of them take
		283	arguments called C<@reply>, which will simply be used to compose a reply
		284	message - C<$reply[0]> is the port to reply to, C<$reply[1]> the type and
		285	the remaining arguments are simply the message data.
372		286
373	=over 4	287	=over 4
374		288
375	=cut	289	=cut
376		290
377	#############################################################################	291	=item wkp => $name, @reply
378	# self node code
379		292
380	sub _new_port($) {	293	Replies with the port ID of the specified well-known port, or C<undef>.
381	my ($name) = @_;
382		294
383	my ($noderef, $portname) = split /#/, $name;	295	=item devnull => ...
384		296
385	$PORT{$name} =	297	Generic data sink/CPU heat conversion.
386	$PORT{$portname} = {
387	names => [$name, $portname],
388	};
389	}
390
391	$NODE{""} = new AnyEvent::MP::Node::Self noderef => $NODE;
392	_new_port "";
393		298
394	=item relay => $port, @msg	299	=item relay => $port, @msg
395		300
396	Simply forwards the message to the given port.	301	Simply forwards the message to the given port.
397		302
398	=cut
399
400	rcv "", relay => \&snd;
401
402	=item eval => $string[ @reply]	303	=item eval => $string[ @reply]
403		304
404	Evaluates the given string. If C<@reply> is given, then a message of the	305	Evaluates the given string. If C<@reply> is given, then a message of the
405	form C<@reply, $@, @evalres> is sent (C<$reply[0]> is the port to reply to).	306	form C<@reply, $@, @evalres> is sent.
406		307
407	=cut	308	Example: crash another node.
408		309
409	rcv "", eval => sub {	310	snd $othernode, eval => "exit";
410	my (undef, $string, @reply) = @_;
411	my @res = eval $string;
412	snd @reply, "$@", @res if @reply;
413	};
414		311
415	=item time => @reply	312	=item time => @reply
416		313
417	Replies the the current node time to C<@reply>.	314	Replies the the current node time to C<@reply>.
418		315
419	=cut	316	Example: tell the current node to send the current time to C<$myport> in a
		317	C<timereply> message.
420		318
421	rcv "", time => sub { shift; snd @_, AE::time };	319	snd $NODE, time => $myport, timereply => 1, 2;
		320	# => snd $myport, timereply => 1, 2, <time>
422		321
423	=back	322	=back
424		323
425	=head1 SEE ALSO	324	=head1 SEE ALSO
426		325

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Comparing AnyEvent-MP/MP.pm (file contents): Revision 1.4 by root, Sat Aug 1 07:36:30 2009 UTC vs. Revision 1.9 by root, Sun Aug 2 15:47:04 2009 UTC

Diff Legend

Comparing AnyEvent-MP/MP.pm (file contents):
Revision 1.4 by root, Sat Aug 1 07:36:30 2009 UTC vs.
Revision 1.9 by root, Sun Aug 2 15:47:04 2009 UTC