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 |
|
30 |
use AnyEvent (); |
31 |
use Guard (); |
32 |
|
33 |
use AnyEvent::MP::Node; |
34 |
use AnyEvent::MP::Transport; |
35 |
|
36 |
use base "Exporter"; |
37 |
|
38 |
our @EXPORT_OK = qw( |
39 |
%NODE %PORT %PORT_DATA $UNIQ $RUNIQ $ID |
40 |
); |
41 |
|
42 |
our @EXPORT = qw( |
43 |
add_node load_func snd_to_func snd_on eval_on |
44 |
|
45 |
NODE $NODE node_of snd kil port_is_local |
46 |
configure |
47 |
up_nodes mon_nodes node_is_up |
48 |
db_set db_del db_reg |
49 |
db_mon db_family db_keys db_values |
50 |
); |
51 |
|
52 |
=item $AnyEvent::MP::Kernel::WARN->($level, $msg) |
53 |
|
54 |
This value is called with an error or warning message, when e.g. a |
55 |
connection could not be created, authorisation failed and so on. |
56 |
|
57 |
It I<must not> block or send messages -queue it and use an idle watcher if |
58 |
you need to do any of these things. |
59 |
|
60 |
C<$level> should be C<0> for messages to be logged always, C<1> for |
61 |
unexpected messages and errors, C<2> for warnings, C<7> for messages about |
62 |
node connectivity and services, C<8> for debugging messages and C<9> for |
63 |
tracing messages. |
64 |
|
65 |
The default simply logs the message to STDERR. |
66 |
|
67 |
=item @AnyEvent::MP::Kernel::WARN |
68 |
|
69 |
All code references in this array are called for every log message, from |
70 |
the default C<$WARN> handler. This is an easy way to tie into the log |
71 |
messages without disturbing others. |
72 |
|
73 |
=cut |
74 |
|
75 |
our $WARNLEVEL = exists $ENV{PERL_ANYEVENT_MP_WARNLEVEL} ? $ENV{PERL_ANYEVENT_MP_WARNLEVEL} : 5; |
76 |
our @WARN; |
77 |
our $WARN = sub { |
78 |
&$_ for @WARN; |
79 |
|
80 |
return if $WARNLEVEL < $_[0]; |
81 |
|
82 |
my ($level, $msg) = @_; |
83 |
|
84 |
$msg =~ s/\n$//; |
85 |
|
86 |
printf STDERR "%s <%d> %s\n", |
87 |
(POSIX::strftime "%Y-%m-%d %H:%M:%S", localtime time), |
88 |
$level, |
89 |
$msg; |
90 |
}; |
91 |
|
92 |
=item $AnyEvent::MP::Kernel::WARNLEVEL [default 5 or $ENV{PERL_ANYEVENT_MP_WARNLEVEL}] |
93 |
|
94 |
The maximum level at which warning messages will be printed to STDERR by |
95 |
the default warn handler. |
96 |
|
97 |
=cut |
98 |
|
99 |
sub load_func($) { |
100 |
my $func = $_[0]; |
101 |
|
102 |
unless (defined &$func) { |
103 |
my $pkg = $func; |
104 |
do { |
105 |
$pkg =~ s/::[^:]+$// |
106 |
or return sub { die "unable to resolve function '$func'" }; |
107 |
|
108 |
local $@; |
109 |
unless (eval "require $pkg; 1") { |
110 |
my $error = $@; |
111 |
$error =~ /^Can't locate .*.pm in \@INC \(/ |
112 |
or return sub { die $error }; |
113 |
} |
114 |
} until defined &$func; |
115 |
} |
116 |
|
117 |
\&$func |
118 |
} |
119 |
|
120 |
my @alnum = ('0' .. '9', 'A' .. 'Z', 'a' .. 'z'); |
121 |
|
122 |
sub nonce($) { |
123 |
join "", map chr rand 256, 1 .. $_[0] |
124 |
} |
125 |
|
126 |
sub nonce62($) { |
127 |
join "", map $alnum[rand 62], 1 .. $_[0] |
128 |
} |
129 |
|
130 |
sub gen_uniq { |
131 |
my $now = AE::now; |
132 |
(join "", |
133 |
map $alnum[$_], |
134 |
$$ / 62 % 62, |
135 |
$$ % 62, |
136 |
(int $now ) % 62, |
137 |
(int $now * 100) % 62, |
138 |
(int $now * 10000) % 62, |
139 |
) . nonce62 4; |
140 |
} |
141 |
|
142 |
our $CONFIG; # this node's configuration |
143 |
our $SECURE = sub { 1 }; |
144 |
|
145 |
our $RUNIQ; # remote uniq value |
146 |
our $UNIQ; # per-process/node unique cookie |
147 |
our $NODE; |
148 |
our $ID = "a"; |
149 |
|
150 |
our %NODE; # node id to transport mapping, or "undef", for local node |
151 |
our (%PORT, %PORT_DATA); # local ports |
152 |
|
153 |
our %RMON; # local ports monitored by remote nodes ($RMON{nodeid}{portid} == cb) |
154 |
our %LMON; # monitored _local_ ports |
155 |
|
156 |
our $GLOBAL; # true if node is a global ("directory") node |
157 |
our %BINDS; |
158 |
our $BINDS; # our listeners, as arrayref |
159 |
|
160 |
our $SRCNODE; # holds the sending node _object_ during _inject |
161 |
|
162 |
sub _init_names { |
163 |
# ~54 bits, for local port names, lowercase $ID appended |
164 |
$UNIQ = gen_uniq; |
165 |
|
166 |
# ~59 bits, for remote port names, one longer than $UNIQ and uppercase at the end to avoid clashes |
167 |
$RUNIQ = nonce62 10; |
168 |
$RUNIQ =~ s/(.)$/\U$1/; |
169 |
|
170 |
$NODE = "anon/$RUNIQ"; |
171 |
} |
172 |
|
173 |
_init_names; |
174 |
|
175 |
sub NODE() { |
176 |
$NODE |
177 |
} |
178 |
|
179 |
sub node_of($) { |
180 |
my ($node, undef) = split /#/, $_[0], 2; |
181 |
|
182 |
$node |
183 |
} |
184 |
|
185 |
BEGIN { |
186 |
*TRACE = $ENV{PERL_ANYEVENT_MP_TRACE} |
187 |
? sub () { 1 } |
188 |
: sub () { 0 }; |
189 |
} |
190 |
|
191 |
our $DELAY_TIMER; |
192 |
our @DELAY_QUEUE; |
193 |
|
194 |
sub _delay_run { |
195 |
(shift @DELAY_QUEUE or return undef $DELAY_TIMER)->() while 1; |
196 |
} |
197 |
|
198 |
sub delay($) { |
199 |
push @DELAY_QUEUE, shift; |
200 |
$DELAY_TIMER ||= AE::timer 0, 0, \&_delay_run; |
201 |
} |
202 |
|
203 |
sub _inject { |
204 |
warn "RCV $SRCNODE->{id} -> " . eval { JSON::XS->new->encode (\@_) } . "\n" if TRACE && @_;#d# |
205 |
&{ $PORT{+shift} or return }; |
206 |
} |
207 |
|
208 |
# this function adds a node-ref, so you can send stuff to it |
209 |
# it is basically the central routing component. |
210 |
sub add_node { |
211 |
my ($node) = @_; |
212 |
|
213 |
$NODE{$node} ||= new AnyEvent::MP::Node::Remote $node |
214 |
} |
215 |
|
216 |
sub snd(@) { |
217 |
my ($nodeid, $portid) = split /#/, shift, 2; |
218 |
|
219 |
warn "SND $nodeid <- " . eval { JSON::XS->new->encode ([$portid, @_]) } . "\n" if TRACE && @_;#d# |
220 |
|
221 |
defined $nodeid #d#UGLY |
222 |
or Carp::croak "'undef' is not a valid node ID/port ID"; |
223 |
|
224 |
($NODE{$nodeid} || add_node $nodeid) |
225 |
->{send} (["$portid", @_]); |
226 |
} |
227 |
|
228 |
=item $is_local = port_is_local $port |
229 |
|
230 |
Returns true iff the port is a local port. |
231 |
|
232 |
=cut |
233 |
|
234 |
sub port_is_local($) { |
235 |
my ($nodeid, undef) = split /#/, $_[0], 2; |
236 |
|
237 |
$NODE{$nodeid} == $NODE{""} |
238 |
} |
239 |
|
240 |
=item snd_to_func $node, $func, @args |
241 |
|
242 |
Expects a node ID and a name of a function. Asynchronously tries to call |
243 |
this function with the given arguments on that node. |
244 |
|
245 |
This function can be used to implement C<spawn>-like interfaces. |
246 |
|
247 |
=cut |
248 |
|
249 |
sub snd_to_func($$;@) { |
250 |
my $nodeid = shift; |
251 |
|
252 |
# on $NODE, we artificially delay... (for spawn) |
253 |
# this is very ugly - maybe we should simply delay ALL messages, |
254 |
# to avoid deep recursion issues. but that's so... slow... |
255 |
$AnyEvent::MP::Node::Self::DELAY = 1 |
256 |
if $nodeid ne $NODE; |
257 |
|
258 |
defined $nodeid #d#UGLY |
259 |
or Carp::croak "'undef' is not a valid node ID/port ID"; |
260 |
|
261 |
($NODE{$nodeid} || add_node $nodeid)->{send} (["", @_]); |
262 |
} |
263 |
|
264 |
=item snd_on $node, @msg |
265 |
|
266 |
Executes C<snd> with the given C<@msg> (which must include the destination |
267 |
port) on the given node. |
268 |
|
269 |
=cut |
270 |
|
271 |
sub snd_on($@) { |
272 |
my $node = shift; |
273 |
snd $node, snd => @_; |
274 |
} |
275 |
|
276 |
=item eval_on $node, $string[, @reply] |
277 |
|
278 |
Evaluates the given string as Perl expression on the given node. When |
279 |
@reply is specified, then it is used to construct a reply message with |
280 |
C<"$@"> and any results from the eval appended. |
281 |
|
282 |
=cut |
283 |
|
284 |
sub eval_on($$;@) { |
285 |
my $node = shift; |
286 |
snd $node, eval => @_; |
287 |
} |
288 |
|
289 |
sub kil(@) { |
290 |
my ($nodeid, $portid) = split /#/, shift, 2; |
291 |
|
292 |
length $portid |
293 |
or Carp::croak "$nodeid#$portid: killing a node port is not allowed, caught"; |
294 |
|
295 |
($NODE{$nodeid} || add_node $nodeid) |
296 |
->kill ("$portid", @_); |
297 |
} |
298 |
|
299 |
############################################################################# |
300 |
# node monitoring and info |
301 |
|
302 |
=item node_is_known $nodeid |
303 |
|
304 |
#TODO# |
305 |
Returns true iff the given node is currently known to this node. |
306 |
|
307 |
=cut |
308 |
|
309 |
sub node_is_known($) { |
310 |
exists $NODE{$_[0]} |
311 |
} |
312 |
|
313 |
=item node_is_up $nodeid |
314 |
|
315 |
Returns true if the given node is "up", that is, the kernel thinks it has |
316 |
a working connection to it. |
317 |
|
318 |
If the node is known (to this local node) but not currently connected, |
319 |
returns C<0>. If the node is not known, returns C<undef>. |
320 |
|
321 |
=cut |
322 |
|
323 |
sub node_is_up($) { |
324 |
($NODE{$_[0]} or return)->{transport} |
325 |
? 1 : 0 |
326 |
} |
327 |
|
328 |
=item up_nodes |
329 |
|
330 |
Return the node IDs of all nodes that are currently connected (excluding |
331 |
the node itself). |
332 |
|
333 |
=cut |
334 |
|
335 |
sub up_nodes() { |
336 |
map $_->{id}, grep $_->{transport}, values %NODE |
337 |
} |
338 |
|
339 |
=item $guard = mon_nodes $callback->($nodeid, $is_up, @reason) |
340 |
|
341 |
Registers a callback that is called each time a node goes up (a connection |
342 |
is established) or down (the connection is lost). |
343 |
|
344 |
Node up messages can only be followed by node down messages for the same |
345 |
node, and vice versa. |
346 |
|
347 |
Note that monitoring a node is usually better done by monitoring its node |
348 |
port. This function is mainly of interest to modules that are concerned |
349 |
about the network topology and low-level connection handling. |
350 |
|
351 |
Callbacks I<must not> block and I<should not> send any messages. |
352 |
|
353 |
The function returns an optional guard which can be used to unregister |
354 |
the monitoring callback again. |
355 |
|
356 |
Example: make sure you call function C<newnode> for all nodes that are up |
357 |
or go up (and down). |
358 |
|
359 |
newnode $_, 1 for up_nodes; |
360 |
mon_nodes \&newnode; |
361 |
|
362 |
=cut |
363 |
|
364 |
our %MON_NODES; |
365 |
|
366 |
sub mon_nodes($) { |
367 |
my ($cb) = @_; |
368 |
|
369 |
$MON_NODES{$cb+0} = $cb; |
370 |
|
371 |
defined wantarray && Guard::guard { delete $MON_NODES{$cb+0} } |
372 |
} |
373 |
|
374 |
sub _inject_nodeevent($$;@) { |
375 |
my ($node, $up, @reason) = @_; |
376 |
|
377 |
for my $cb (values %MON_NODES) { |
378 |
eval { $cb->($node->{id}, $up, @reason); 1 } |
379 |
or $WARN->(1, $@); |
380 |
} |
381 |
|
382 |
$WARN->(7, "$node->{id} is " . ($up ? "up" : "down") . " (@reason)"); |
383 |
} |
384 |
|
385 |
############################################################################# |
386 |
# self node code |
387 |
|
388 |
sub _kill { |
389 |
my $port = shift; |
390 |
|
391 |
delete $PORT{$port} |
392 |
or return; # killing nonexistent ports is O.K. |
393 |
delete $PORT_DATA{$port}; |
394 |
|
395 |
my $mon = delete $LMON{$port} |
396 |
or !@_ |
397 |
or $WARN->(2, "unmonitored local port $port died with reason: @_"); |
398 |
|
399 |
$_->(@_) for values %$mon; |
400 |
} |
401 |
|
402 |
sub _monitor { |
403 |
return $_[2](no_such_port => "cannot monitor nonexistent port", "$NODE#$_[1]") |
404 |
unless exists $PORT{$_[1]}; |
405 |
|
406 |
$LMON{$_[1]}{$_[2]+0} = $_[2]; |
407 |
} |
408 |
|
409 |
sub _unmonitor { |
410 |
delete $LMON{$_[1]}{$_[2]+0} |
411 |
if exists $LMON{$_[1]}; |
412 |
} |
413 |
|
414 |
sub _secure_check { |
415 |
$SECURE->($SRCNODE->{id}) |
416 |
or die "remote execution attempt by insecure node\n"; |
417 |
} |
418 |
|
419 |
our %NODE_REQ = ( |
420 |
# internal services |
421 |
|
422 |
# monitoring |
423 |
mon0 => sub { # stop monitoring a port for another node |
424 |
my $portid = shift; |
425 |
_unmonitor undef, $portid, delete $SRCNODE->{rmon}{$portid}; |
426 |
}, |
427 |
mon1 => sub { # start monitoring a port for another node |
428 |
my $portid = shift; |
429 |
Scalar::Util::weaken (my $node = $SRCNODE); |
430 |
_monitor undef, $portid, $node->{rmon}{$portid} = sub { |
431 |
delete $node->{rmon}{$portid}; |
432 |
$node->send (["", kil0 => $portid, @_]) |
433 |
if $node && $node->{transport}; |
434 |
}; |
435 |
}, |
436 |
# another node has killed a monitored port |
437 |
kil0 => sub { |
438 |
my $cbs = delete $SRCNODE->{lmon}{+shift} |
439 |
or return; |
440 |
|
441 |
$_->(@_) for @$cbs; |
442 |
}, |
443 |
|
444 |
# "public" services - not actually public |
445 |
|
446 |
# another node wants to kill a local port |
447 |
kil => \&_kill, |
448 |
|
449 |
# relay message to another node / generic echo |
450 |
snd => \&snd, |
451 |
snd_multiple => sub { |
452 |
snd @$_ for @_ |
453 |
}, |
454 |
|
455 |
# random utilities |
456 |
eval => sub { |
457 |
&_secure_check; |
458 |
my @res = do { package main; eval shift }; |
459 |
snd @_, "$@", @res if @_; |
460 |
}, |
461 |
time => sub { |
462 |
snd @_, AE::now; |
463 |
}, |
464 |
devnull => sub { |
465 |
# |
466 |
}, |
467 |
"" => sub { |
468 |
# empty messages are keepalives or similar devnull-applications |
469 |
}, |
470 |
); |
471 |
|
472 |
$NODE{""} = $NODE{$NODE} = new AnyEvent::MP::Node::Self $NODE; |
473 |
$PORT{""} = sub { |
474 |
my $tag = shift; |
475 |
eval { &{ $NODE_REQ{$tag} ||= do { &_secure_check; load_func $tag } } }; |
476 |
$WARN->(2, "error processing node message from $SRCNODE->{id}: $@") if $@; |
477 |
}; |
478 |
|
479 |
our $NPROTO = 1; |
480 |
|
481 |
# tell everybody who connects our nproto |
482 |
push @AnyEvent::MP::Transport::HOOK_GREET, sub { |
483 |
$_[0]{local_greeting}{nproto} = $NPROTO; |
484 |
}; |
485 |
|
486 |
############################################################################# |
487 |
# seed management, try to keep connections to all seeds at all times |
488 |
|
489 |
our %SEED_NODE; # seed ID => node ID|undef |
490 |
our %NODE_SEED; # map node ID to seed ID |
491 |
our %SEED_CONNECT; # $seed => transport_connector | 1=connected | 2=connecting |
492 |
our $SEED_WATCHER; |
493 |
our $SEED_RETRY; |
494 |
|
495 |
sub seed_connect { |
496 |
my ($seed) = @_; |
497 |
|
498 |
my ($host, $port) = AnyEvent::Socket::parse_hostport $seed |
499 |
or Carp::croak "$seed: unparsable seed address"; |
500 |
|
501 |
$AnyEvent::MP::Kernel::WARN->(9, "trying connect to seed node $seed."); |
502 |
|
503 |
$SEED_CONNECT{$seed} ||= AnyEvent::MP::Transport::mp_connect |
504 |
$host, $port, |
505 |
on_greeted => sub { |
506 |
# called after receiving remote greeting, learn remote node name |
507 |
|
508 |
# we rely on untrusted data here (the remote node name) this is |
509 |
# hopefully ok, as this can at most be used for DOSing, which is easy |
510 |
# when you can do MITM anyway. |
511 |
|
512 |
# if we connect to ourselves, nuke this seed, but make sure we act like a seed |
513 |
if ($_[0]{remote_node} eq $AnyEvent::MP::Kernel::NODE) { |
514 |
require AnyEvent::MP::Global; # every seed becomes a global node currently |
515 |
delete $SEED_NODE{$seed}; |
516 |
delete $NODE_SEED{$seed}; |
517 |
} else { |
518 |
$SEED_NODE{$seed} = $_[0]{remote_node}; |
519 |
$NODE_SEED{$_[0]{remote_node}} = $seed; |
520 |
} |
521 |
}, |
522 |
on_destroy => sub { |
523 |
delete $SEED_CONNECT{$seed}; |
524 |
}, |
525 |
sub { |
526 |
$SEED_CONNECT{$seed} = 1; |
527 |
} |
528 |
; |
529 |
} |
530 |
|
531 |
sub seed_all { |
532 |
my @seeds = grep { |
533 |
!exists $SEED_CONNECT{$_} |
534 |
&& !(defined $SEED_NODE{$_} && node_is_up $SEED_NODE{$_}) |
535 |
} keys %SEED_NODE; |
536 |
|
537 |
if (@seeds) { |
538 |
# start connection attempt for every seed we are not connected to yet |
539 |
seed_connect $_ |
540 |
for @seeds; |
541 |
|
542 |
$SEED_RETRY = $SEED_RETRY * 2 + rand; |
543 |
$SEED_RETRY = $AnyEvent::MP::Kernel::CONFIG->{monitor_timeout} |
544 |
if $SEED_RETRY > $AnyEvent::MP::Kernel::CONFIG->{monitor_timeout}; |
545 |
|
546 |
$SEED_WATCHER = AE::timer $SEED_RETRY, 0, \&seed_all; |
547 |
|
548 |
} else { |
549 |
# all seeds connected or connecting, no need to restart timer |
550 |
undef $SEED_WATCHER; |
551 |
} |
552 |
} |
553 |
|
554 |
sub seed_again { |
555 |
$SEED_RETRY = 1; |
556 |
$SEED_WATCHER ||= AE::timer 1, 0, \&seed_all; |
557 |
} |
558 |
|
559 |
# sets new seed list, starts connecting |
560 |
sub set_seeds(@) { |
561 |
%SEED_NODE = (); |
562 |
%NODE_SEED = (); |
563 |
%SEED_CONNECT = (); |
564 |
|
565 |
@SEED_NODE{@_} = (); |
566 |
|
567 |
seed_again;#d# |
568 |
seed_all; |
569 |
} |
570 |
|
571 |
mon_nodes sub { |
572 |
# if we lost the connection to a seed node, make sure we are seeding |
573 |
seed_again |
574 |
if !$_[1] && exists $NODE_SEED{$_[0]}; |
575 |
}; |
576 |
|
577 |
############################################################################# |
578 |
# talk with/to global nodes |
579 |
|
580 |
# protocol messages: |
581 |
# |
582 |
# sent by all slave nodes (slave to master) |
583 |
# g_slave database - make other global node master of the sender |
584 |
# |
585 |
# sent by any node to global nodes |
586 |
# g_set database - set whole database |
587 |
# g_add family key val - add/replace key to database |
588 |
# g_del family key - delete key from database |
589 |
# g_get family key reply... - send reply with data |
590 |
# |
591 |
# send by global nodes |
592 |
# g_global - node became global, similar to global=1 greeting |
593 |
# |
594 |
# database families |
595 |
# "'l" -> node -> listeners |
596 |
# "'g" -> node -> undef |
597 |
# ... |
598 |
# |
599 |
|
600 |
# used on all nodes: |
601 |
our $MASTER; # the global node we bind ourselves to, unless we are global ourselves |
602 |
our $MASTER_MON; |
603 |
our %LOCAL_DB; # this node database |
604 |
|
605 |
our %GLOBAL_DB; # all local databases, merged - empty on non-global nodes |
606 |
|
607 |
our $GPROTO = 1; |
608 |
|
609 |
# tell everybody who connects our nproto |
610 |
push @AnyEvent::MP::Transport::HOOK_GREET, sub { |
611 |
$_[0]{local_greeting}{gproto} = $GPROTO; |
612 |
}; |
613 |
|
614 |
############################################################################# |
615 |
# master selection |
616 |
|
617 |
# master requests |
618 |
our %GLOBAL_REQ; # $id => \@req |
619 |
|
620 |
sub global_req_add { |
621 |
my ($id, $req) = @_; |
622 |
|
623 |
return if exists $GLOBAL_REQ{$id}; |
624 |
|
625 |
$GLOBAL_REQ{$id} = $req; |
626 |
|
627 |
snd $MASTER, @$req |
628 |
if $MASTER; |
629 |
} |
630 |
|
631 |
sub global_req_del { |
632 |
delete $GLOBAL_REQ{$_[0]}; |
633 |
} |
634 |
|
635 |
sub g_find { |
636 |
global_req_add "g_find $_[0]", [g_find => $_[0]]; |
637 |
} |
638 |
|
639 |
# reply for g_find started in Node.pm |
640 |
$NODE_REQ{g_found} = sub { |
641 |
global_req_del "g_find $_[0]"; |
642 |
|
643 |
my $node = $NODE{$_[0]} or return; |
644 |
|
645 |
$node->connect_to ($_[1]); |
646 |
}; |
647 |
|
648 |
sub master_set { |
649 |
$MASTER = $_[0]; |
650 |
|
651 |
snd $MASTER, g_slave => \%LOCAL_DB; |
652 |
|
653 |
# (re-)send queued requests |
654 |
snd $MASTER, @$_ |
655 |
for values %GLOBAL_REQ; |
656 |
} |
657 |
|
658 |
sub master_search { |
659 |
#TODO: should also look for other global nodes, but we don't know them #d# |
660 |
for (keys %NODE_SEED) { |
661 |
if (node_is_up $_) { |
662 |
master_set $_; |
663 |
return; |
664 |
} |
665 |
} |
666 |
|
667 |
$MASTER_MON = mon_nodes sub { |
668 |
return unless $_[1]; # we are only interested in node-ups |
669 |
return unless $NODE_SEED{$_[0]}; # we are only interested in seed nodes |
670 |
|
671 |
master_set $_[0]; |
672 |
|
673 |
$MASTER_MON = mon_nodes sub { |
674 |
if ($_[0] eq $MASTER && !$_[1]) { |
675 |
undef $MASTER; |
676 |
master_search (); |
677 |
} |
678 |
}; |
679 |
}; |
680 |
} |
681 |
|
682 |
# other node wants to make us the master |
683 |
$NODE_REQ{g_slave} = sub { |
684 |
my ($db) = @_; |
685 |
|
686 |
# load global module and redo the request |
687 |
require AnyEvent::MP::Global; |
688 |
&{ $NODE_REQ{g_slave} } |
689 |
}; |
690 |
|
691 |
############################################################################# |
692 |
# local database operations |
693 |
|
694 |
# local database management |
695 |
sub db_set($$;$) { |
696 |
$LOCAL_DB{$_[0]}{$_[1]} = $_[2]; |
697 |
snd $MASTER, g_add => $_[0] => $_[1] => $_[2] |
698 |
if defined $MASTER; |
699 |
} |
700 |
|
701 |
sub db_del($$) { |
702 |
delete $LOCAL_DB{$_[0]}{$_[1]}; |
703 |
snd $MASTER, g_del => $_[0] => $_[1] |
704 |
if defined $MASTER; |
705 |
} |
706 |
|
707 |
sub db_reg($$;$) { |
708 |
my ($family, $key) = @_; |
709 |
&db_set; |
710 |
Guard::guard { db_del $family => $key } |
711 |
} |
712 |
|
713 |
sub db_keys($$$) { |
714 |
#d# |
715 |
} |
716 |
|
717 |
#d# db_values |
718 |
#d# db_family |
719 |
#d# db_key |
720 |
|
721 |
our %LOCAL_MON; # f, reply |
722 |
our %MON_DB; # f, k, value |
723 |
|
724 |
sub db_mon($@) { |
725 |
my ($family, $cb) = @_; |
726 |
|
727 |
if (my $db = $MON_DB{$family}) { |
728 |
# if we already monitor this thingy, generate |
729 |
# create events for all of them |
730 |
$cb->($db, [keys %$db]); |
731 |
} else { |
732 |
# new monitor, request chg1 from upstream |
733 |
global_req_add "mon1 $family" => [g_mon1 => $family]; |
734 |
$MON_DB{$family} = {}; |
735 |
} |
736 |
|
737 |
$LOCAL_MON{$family}{$cb+0} = $cb; |
738 |
|
739 |
Guard::guard { |
740 |
my $mon = $LOCAL_MON{$family}; |
741 |
delete $mon->{$cb+0}; |
742 |
|
743 |
unless (%$mon) { |
744 |
global_req_del "mon1 $family"; |
745 |
|
746 |
# no global_req, because we don't care if we are not connected |
747 |
snd $MASTER, g_mon0 => $family |
748 |
if $MASTER; |
749 |
|
750 |
delete $LOCAL_MON{$family}; |
751 |
delete $MON_DB{$family}; |
752 |
} |
753 |
} |
754 |
} |
755 |
|
756 |
# full update |
757 |
$NODE_REQ{g_chg1} = sub { |
758 |
my ($f, $ndb) = @_; |
759 |
|
760 |
my $db = $MON_DB{$f}; |
761 |
my @k; |
762 |
|
763 |
# add or replace keys |
764 |
while (my ($k, $v) = each %$ndb) { |
765 |
$db->{$k} = $v; |
766 |
push @k, $k; |
767 |
} |
768 |
|
769 |
# delete keys that are no longer present |
770 |
for (grep !exists $ndb->{$_}, keys %$db) { |
771 |
delete $db->{$_}; |
772 |
push @k, $_; |
773 |
} |
774 |
|
775 |
$_->($db, \@k) |
776 |
for values %{ $LOCAL_MON{$_[0]} }; |
777 |
}; |
778 |
|
779 |
# incremental update |
780 |
$NODE_REQ{g_chg2} = sub { |
781 |
my $db = $MON_DB{$_[0]}; |
782 |
|
783 |
@_ >= 3 |
784 |
? $db->{$_[1]} = $_[2] |
785 |
: delete $db->{$_[1]}; |
786 |
|
787 |
$_->($db, [$_[1]]) |
788 |
for values %{ $LOCAL_MON{$_[0]} }; |
789 |
}; |
790 |
|
791 |
############################################################################# |
792 |
# configure |
793 |
|
794 |
sub nodename { |
795 |
require POSIX; |
796 |
(POSIX::uname ())[1] |
797 |
} |
798 |
|
799 |
sub _resolve($) { |
800 |
my ($nodeid) = @_; |
801 |
|
802 |
my $cv = AE::cv; |
803 |
my @res; |
804 |
|
805 |
$cv->begin (sub { |
806 |
my %seen; |
807 |
my @refs; |
808 |
for (sort { $a->[0] <=> $b->[0] } @res) { |
809 |
push @refs, $_->[1] unless $seen{$_->[1]}++ |
810 |
} |
811 |
shift->send (@refs); |
812 |
}); |
813 |
|
814 |
my $idx; |
815 |
for my $t (split /,/, $nodeid) { |
816 |
my $pri = ++$idx; |
817 |
|
818 |
$t = length $t ? nodename . ":$t" : nodename |
819 |
if $t =~ /^\d*$/; |
820 |
|
821 |
my ($host, $port) = AnyEvent::Socket::parse_hostport $t, 0 |
822 |
or Carp::croak "$t: unparsable transport descriptor"; |
823 |
|
824 |
$port = "0" if $port eq "*"; |
825 |
|
826 |
if ($host eq "*") { |
827 |
$cv->begin; |
828 |
# use fork_call, as Net::Interface is big, and we need it rarely. |
829 |
require AnyEvent::Util; |
830 |
AnyEvent::Util::fork_call ( |
831 |
sub { |
832 |
my @addr; |
833 |
|
834 |
require Net::Interface; |
835 |
|
836 |
for my $if (Net::Interface->interfaces) { |
837 |
# we statically lower-prioritise ipv6 here, TODO :() |
838 |
for $_ ($if->address (Net::Interface::AF_INET ())) { |
839 |
next if /^\x7f/; # skip localhost etc. |
840 |
push @addr, $_; |
841 |
} |
842 |
for ($if->address (Net::Interface::AF_INET6 ())) { |
843 |
#next if $if->scope ($_) <= 2; |
844 |
next unless /^[\x20-\x3f\xfc\xfd]/; # global unicast, site-local unicast |
845 |
push @addr, $_; |
846 |
} |
847 |
|
848 |
} |
849 |
@addr |
850 |
}, sub { |
851 |
for my $ip (@_) { |
852 |
push @res, [ |
853 |
$pri += 1e-5, |
854 |
AnyEvent::Socket::format_hostport AnyEvent::Socket::format_address $ip, $port |
855 |
]; |
856 |
} |
857 |
$cv->end; |
858 |
} |
859 |
); |
860 |
} else { |
861 |
$cv->begin; |
862 |
AnyEvent::Socket::resolve_sockaddr $host, $port, "tcp", 0, undef, sub { |
863 |
for (@_) { |
864 |
my ($service, $host) = AnyEvent::Socket::unpack_sockaddr $_->[3]; |
865 |
push @res, [ |
866 |
$pri += 1e-5, |
867 |
AnyEvent::Socket::format_hostport AnyEvent::Socket::format_address $host, $service |
868 |
]; |
869 |
} |
870 |
$cv->end; |
871 |
}; |
872 |
} |
873 |
} |
874 |
|
875 |
$cv->end; |
876 |
|
877 |
$cv |
878 |
} |
879 |
|
880 |
sub configure(@) { |
881 |
unshift @_, "profile" if @_ & 1; |
882 |
my (%kv) = @_; |
883 |
|
884 |
delete $NODE{$NODE}; # we do not support doing stuff before configure |
885 |
_init_names; |
886 |
|
887 |
my $profile = delete $kv{profile}; |
888 |
|
889 |
$profile = nodename |
890 |
unless defined $profile; |
891 |
|
892 |
$CONFIG = AnyEvent::MP::Config::find_profile $profile, %kv; |
893 |
|
894 |
if (exists $CONFIG->{secure}) { |
895 |
my $pass = !$CONFIG->{secure}; |
896 |
$SECURE = sub { $pass }; |
897 |
} |
898 |
|
899 |
my $node = exists $CONFIG->{nodeid} ? $CONFIG->{nodeid} : "$profile/"; |
900 |
|
901 |
$node or Carp::croak "$node: illegal node ID (see AnyEvent::MP manpage for syntax)\n"; |
902 |
|
903 |
$NODE = $node; |
904 |
|
905 |
$NODE =~ s/%n/nodename/ge; |
906 |
|
907 |
if ($NODE =~ s!(?:(?<=/)$|%u)!$RUNIQ!g) { |
908 |
# nodes with randomised node names do not need randomised port names |
909 |
$UNIQ = ""; |
910 |
} |
911 |
|
912 |
$NODE{$NODE} = $NODE{""}; |
913 |
$NODE{$NODE}{id} = $NODE; |
914 |
|
915 |
my $seeds = $CONFIG->{seeds}; |
916 |
my $binds = $CONFIG->{binds}; |
917 |
|
918 |
$binds ||= ["*"]; |
919 |
|
920 |
$WARN->(8, "node $NODE starting up."); |
921 |
|
922 |
$BINDS = []; |
923 |
%BINDS = (); |
924 |
|
925 |
for (map _resolve $_, @$binds) { |
926 |
for my $bind ($_->recv) { |
927 |
my ($host, $port) = AnyEvent::Socket::parse_hostport $bind |
928 |
or Carp::croak "$bind: unparsable local bind address"; |
929 |
|
930 |
my $listener = AnyEvent::MP::Transport::mp_server |
931 |
$host, |
932 |
$port, |
933 |
prepare => sub { |
934 |
my (undef, $host, $port) = @_; |
935 |
$bind = AnyEvent::Socket::format_hostport $host, $port; |
936 |
0 |
937 |
}, |
938 |
; |
939 |
$BINDS{$bind} = $listener; |
940 |
push @$BINDS, $bind; |
941 |
} |
942 |
} |
943 |
|
944 |
db_set "'l" => $NODE => $BINDS; |
945 |
|
946 |
$WARN->(8, "node listens on [@$BINDS]."); |
947 |
|
948 |
# connect to all seednodes |
949 |
set_seeds map $_->recv, map _resolve $_, @$seeds; |
950 |
|
951 |
master_search; |
952 |
|
953 |
if ($NODE eq "atha") {;#d# |
954 |
my $w; $w = AE::timer 4, 0, sub { undef $w; require AnyEvent::MP::Global };#d# |
955 |
} |
956 |
|
957 |
for (@{ $CONFIG->{services} }) { |
958 |
if (ref) { |
959 |
my ($func, @args) = @$_; |
960 |
(load_func $func)->(@args); |
961 |
} elsif (s/::$//) { |
962 |
eval "require $_"; |
963 |
die $@ if $@; |
964 |
} else { |
965 |
(load_func $_)->(); |
966 |
} |
967 |
} |
968 |
} |
969 |
|
970 |
=back |
971 |
|
972 |
=head1 SEE ALSO |
973 |
|
974 |
L<AnyEvent::MP>. |
975 |
|
976 |
=head1 AUTHOR |
977 |
|
978 |
Marc Lehmann <schmorp@schmorp.de> |
979 |
http://home.schmorp.de/ |
980 |
|
981 |
=cut |
982 |
|
983 |
1 |
984 |
|