| 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 |
$AnyEvent::MP::Kernel::SRCNODE # contains msg origin node id, for debugging |
| 10 |
|
| 11 |
snd_to_func $node, $func, @args # send msg to function |
| 12 |
snd_on $node, @msg # snd message again (relay) |
| 13 |
eval_on $node, $string[, @reply] # execute perl code on another node |
| 14 |
|
| 15 |
node_is_up $nodeid # return true if a node is connected |
| 16 |
@nodes = up_nodes # return a list of all connected nodes |
| 17 |
$guard = mon_nodes $callback->($node, $is_up, @reason) # connections up/downs |
| 18 |
|
| 19 |
=head1 DESCRIPTION |
| 20 |
|
| 21 |
This module implements most of the inner workings of AnyEvent::MP. It |
| 22 |
offers mostly lower-level functions that deal with network connectivity |
| 23 |
and special requests. |
| 24 |
|
| 25 |
You normally interface with AnyEvent::MP through a higher level interface |
| 26 |
such as L<AnyEvent::MP> and L<Coro::MP>, although there is nothing wrong |
| 27 |
with using the functions from this module. |
| 28 |
|
| 29 |
=head1 GLOBALS AND FUNCTIONS |
| 30 |
|
| 31 |
=over 4 |
| 32 |
|
| 33 |
=cut |
| 34 |
|
| 35 |
package AnyEvent::MP::Kernel; |
| 36 |
|
| 37 |
use common::sense; |
| 38 |
use Carp (); |
| 39 |
|
| 40 |
use AnyEvent (); |
| 41 |
use Guard (); |
| 42 |
|
| 43 |
use AnyEvent::MP::Node; |
| 44 |
use AnyEvent::MP::Transport; |
| 45 |
|
| 46 |
use base "Exporter"; |
| 47 |
|
| 48 |
# for re-export in AnyEvent::MP and Coro::MP |
| 49 |
our @EXPORT_API = qw( |
| 50 |
NODE $NODE |
| 51 |
configure |
| 52 |
node_of port_is_local |
| 53 |
snd kil |
| 54 |
db_set db_del |
| 55 |
db_mon db_family db_keys db_values |
| 56 |
); |
| 57 |
|
| 58 |
our @EXPORT_OK = ( |
| 59 |
# these are internal |
| 60 |
qw( |
| 61 |
%NODE %PORT %PORT_DATA $UNIQ $RUNIQ $ID |
| 62 |
add_node load_func |
| 63 |
), |
| 64 |
@EXPORT_API, |
| 65 |
); |
| 66 |
|
| 67 |
our @EXPORT = qw( |
| 68 |
snd_to_func snd_on eval_on |
| 69 |
port_is_local |
| 70 |
up_nodes mon_nodes node_is_up |
| 71 |
); |
| 72 |
|
| 73 |
sub load_func($) { |
| 74 |
my $func = $_[0]; |
| 75 |
|
| 76 |
unless (defined &$func) { |
| 77 |
my $pkg = $func; |
| 78 |
do { |
| 79 |
$pkg =~ s/::[^:]+$// |
| 80 |
or return sub { die "unable to resolve function '$func'" }; |
| 81 |
|
| 82 |
local $@; |
| 83 |
unless (eval "require $pkg; 1") { |
| 84 |
my $error = $@; |
| 85 |
$error =~ /^Can't locate .*.pm in \@INC \(/ |
| 86 |
or return sub { die $error }; |
| 87 |
} |
| 88 |
} until defined &$func; |
| 89 |
} |
| 90 |
|
| 91 |
\&$func |
| 92 |
} |
| 93 |
|
| 94 |
my @alnum = ('0' .. '9', 'A' .. 'Z', 'a' .. 'z'); |
| 95 |
|
| 96 |
sub nonce($) { |
| 97 |
join "", map chr rand 256, 1 .. $_[0] |
| 98 |
} |
| 99 |
|
| 100 |
sub nonce62($) { |
| 101 |
join "", map $alnum[rand 62], 1 .. $_[0] |
| 102 |
} |
| 103 |
|
| 104 |
our $CONFIG; # this node's configuration |
| 105 |
our $SECURE; |
| 106 |
|
| 107 |
our $RUNIQ; # remote uniq value |
| 108 |
our $UNIQ; # per-process/node unique cookie |
| 109 |
our $NODE; |
| 110 |
our $ID = "a"; |
| 111 |
|
| 112 |
our %NODE; # node id to transport mapping, or "undef", for local node |
| 113 |
our (%PORT, %PORT_DATA); # local ports |
| 114 |
|
| 115 |
our %RMON; # local ports monitored by remote nodes ($RMON{nodeid}{portid} == cb) |
| 116 |
our %LMON; # monitored _local_ ports |
| 117 |
|
| 118 |
our $GLOBAL; # true if node is a global ("directory") node |
| 119 |
our %BINDS; |
| 120 |
our $BINDS; # our listeners, as arrayref |
| 121 |
|
| 122 |
our $SRCNODE; # holds the sending node _object_ during _inject |
| 123 |
|
| 124 |
# initialise names for non-networked operation |
| 125 |
{ |
| 126 |
# ~54 bits, for local port names, lowercase $ID appended |
| 127 |
my $now = AE::now; |
| 128 |
$UNIQ = |
| 129 |
(join "", |
| 130 |
map $alnum[$_], |
| 131 |
$$ / 62 % 62, |
| 132 |
$$ % 62, |
| 133 |
(int $now ) % 62, |
| 134 |
(int $now * 100) % 62, |
| 135 |
(int $now * 10000) % 62, |
| 136 |
) . nonce62 4 |
| 137 |
; |
| 138 |
|
| 139 |
# ~59 bits, for remote port names, one longer than $UNIQ and uppercase at the end to avoid clashes |
| 140 |
$RUNIQ = nonce62 10; |
| 141 |
$RUNIQ =~ s/(.)$/\U$1/; |
| 142 |
|
| 143 |
$NODE = ""; |
| 144 |
} |
| 145 |
|
| 146 |
sub NODE() { |
| 147 |
$NODE |
| 148 |
} |
| 149 |
|
| 150 |
sub node_of($) { |
| 151 |
my ($node, undef) = split /#/, $_[0], 2; |
| 152 |
|
| 153 |
$node |
| 154 |
} |
| 155 |
|
| 156 |
BEGIN { |
| 157 |
*TRACE = $ENV{PERL_ANYEVENT_MP_TRACE} |
| 158 |
? sub () { 1 } |
| 159 |
: sub () { 0 }; |
| 160 |
} |
| 161 |
|
| 162 |
our $DELAY_TIMER; |
| 163 |
our @DELAY_QUEUE; |
| 164 |
|
| 165 |
our $delay_run = sub { |
| 166 |
(shift @DELAY_QUEUE or return undef $DELAY_TIMER)->() while 1; |
| 167 |
}; |
| 168 |
|
| 169 |
sub delay($) { |
| 170 |
push @DELAY_QUEUE, shift; |
| 171 |
$DELAY_TIMER ||= AE::timer 0, 0, $delay_run; |
| 172 |
} |
| 173 |
|
| 174 |
=item $AnyEvent::MP::Kernel::SRCNODE |
| 175 |
|
| 176 |
During execution of a message callback, this variable contains the node ID |
| 177 |
of the origin node. |
| 178 |
|
| 179 |
The main use of this variable is for debugging output - there are probably |
| 180 |
very few other cases where you need to know the source node ID. |
| 181 |
|
| 182 |
=cut |
| 183 |
|
| 184 |
sub _inject { |
| 185 |
warn "RCV $SRCNODE -> " . eval { JSON::XS->new->encode (\@_) } . "\n" if TRACE && @_;#d# |
| 186 |
&{ $PORT{+shift} or return }; |
| 187 |
} |
| 188 |
|
| 189 |
# this function adds a node-ref, so you can send stuff to it |
| 190 |
# it is basically the central routing component. |
| 191 |
sub add_node { |
| 192 |
$NODE{$_[0]} || do { |
| 193 |
my ($node) = @_; |
| 194 |
|
| 195 |
length $node |
| 196 |
or Carp::croak "'undef' or the empty string are not valid node/port IDs"; |
| 197 |
|
| 198 |
# registers itself in %NODE |
| 199 |
new AnyEvent::MP::Node::Remote $node |
| 200 |
} |
| 201 |
} |
| 202 |
|
| 203 |
sub snd(@) { |
| 204 |
my ($nodeid, $portid) = split /#/, shift, 2; |
| 205 |
|
| 206 |
warn "SND $nodeid <- " . eval { JSON::XS->new->encode ([$portid, @_]) } . "\n" if TRACE && @_;#d# |
| 207 |
|
| 208 |
($NODE{$nodeid} || add_node $nodeid) |
| 209 |
->{send} (["$portid", @_]); |
| 210 |
} |
| 211 |
|
| 212 |
sub port_is_local($) { |
| 213 |
my ($nodeid, undef) = split /#/, $_[0], 2; |
| 214 |
|
| 215 |
$nodeid eq $NODE |
| 216 |
} |
| 217 |
|
| 218 |
=item snd_to_func $node, $func, @args |
| 219 |
|
| 220 |
Expects a node ID and a name of a function. Asynchronously tries to call |
| 221 |
this function with the given arguments on that node. |
| 222 |
|
| 223 |
This function can be used to implement C<spawn>-like interfaces. |
| 224 |
|
| 225 |
=cut |
| 226 |
|
| 227 |
sub snd_to_func($$;@) { |
| 228 |
my $nodeid = shift; |
| 229 |
|
| 230 |
# on $NODE, we artificially delay... (for spawn) |
| 231 |
# this is very ugly - maybe we should simply delay ALL messages, |
| 232 |
# to avoid deep recursion issues. but that's so... slow... |
| 233 |
$AnyEvent::MP::Node::Self::DELAY = 1 |
| 234 |
if $nodeid ne $NODE; |
| 235 |
|
| 236 |
($NODE{$nodeid} || add_node $nodeid)->{send} (["", @_]); |
| 237 |
} |
| 238 |
|
| 239 |
=item snd_on $node, @msg |
| 240 |
|
| 241 |
Executes C<snd> with the given C<@msg> (which must include the destination |
| 242 |
port) on the given node. |
| 243 |
|
| 244 |
=cut |
| 245 |
|
| 246 |
sub snd_on($@) { |
| 247 |
my $node = shift; |
| 248 |
snd $node, snd => @_; |
| 249 |
} |
| 250 |
|
| 251 |
=item eval_on $node, $string[, @reply] |
| 252 |
|
| 253 |
Evaluates the given string as Perl expression on the given node. When |
| 254 |
@reply is specified, then it is used to construct a reply message with |
| 255 |
C<"$@"> and any results from the eval appended. |
| 256 |
|
| 257 |
=cut |
| 258 |
|
| 259 |
sub eval_on($$;@) { |
| 260 |
my $node = shift; |
| 261 |
snd $node, eval => @_; |
| 262 |
} |
| 263 |
|
| 264 |
sub kil(@) { |
| 265 |
my ($nodeid, $portid) = split /#/, shift, 2; |
| 266 |
|
| 267 |
length $portid |
| 268 |
or Carp::croak "$nodeid#$portid: killing a node port is not allowed, caught"; |
| 269 |
|
| 270 |
($NODE{$nodeid} || add_node $nodeid) |
| 271 |
->kill ("$portid", @_); |
| 272 |
} |
| 273 |
|
| 274 |
############################################################################# |
| 275 |
# node monitoring and info |
| 276 |
|
| 277 |
=item $bool = node_is_up $nodeid |
| 278 |
|
| 279 |
Returns true if the given node is "up", that is, the kernel thinks it has |
| 280 |
a working connection to it. |
| 281 |
|
| 282 |
More precisely, if the node is up, returns C<1>. If the node is currently |
| 283 |
connecting or otherwise known but not connected, returns C<0>. If nothing |
| 284 |
is known about the node, returns C<undef>. |
| 285 |
|
| 286 |
=cut |
| 287 |
|
| 288 |
sub node_is_up($) { |
| 289 |
($_[0] eq $NODE) || ($NODE{$_[0]} or return)->{transport} |
| 290 |
? 1 : 0 |
| 291 |
} |
| 292 |
|
| 293 |
=item @nodes = up_nodes |
| 294 |
|
| 295 |
Return the node IDs of all nodes that are currently connected (excluding |
| 296 |
the node itself). |
| 297 |
|
| 298 |
=cut |
| 299 |
|
| 300 |
sub up_nodes() { |
| 301 |
map $_->{id}, grep $_->{transport}, values %NODE |
| 302 |
} |
| 303 |
|
| 304 |
=item $guard = mon_nodes $callback->($nodeid, $is_up, @reason) |
| 305 |
|
| 306 |
Registers a callback that is called each time a node goes up (a connection |
| 307 |
is established) or down (the connection is lost). |
| 308 |
|
| 309 |
Node up messages can only be followed by node down messages for the same |
| 310 |
node, and vice versa. |
| 311 |
|
| 312 |
Note that monitoring a node is usually better done by monitoring its node |
| 313 |
port. This function is mainly of interest to modules that are concerned |
| 314 |
about the network topology and low-level connection handling. |
| 315 |
|
| 316 |
Callbacks I<must not> block and I<should not> send any messages. |
| 317 |
|
| 318 |
The function returns an optional guard which can be used to unregister |
| 319 |
the monitoring callback again. |
| 320 |
|
| 321 |
Example: make sure you call function C<newnode> for all nodes that are up |
| 322 |
or go up (and down). |
| 323 |
|
| 324 |
newnode $_, 1 for up_nodes; |
| 325 |
mon_nodes \&newnode; |
| 326 |
|
| 327 |
=cut |
| 328 |
|
| 329 |
our %MON_NODES; |
| 330 |
|
| 331 |
sub mon_nodes($) { |
| 332 |
my ($cb) = @_; |
| 333 |
|
| 334 |
$MON_NODES{$cb+0} = $cb; |
| 335 |
|
| 336 |
defined wantarray |
| 337 |
and Guard::guard { delete $MON_NODES{$cb+0} } |
| 338 |
} |
| 339 |
|
| 340 |
sub _inject_nodeevent($$;@) { |
| 341 |
my ($node, $up, @reason) = @_; |
| 342 |
|
| 343 |
AE::log 7 => "$node->{id} is " . ($up ? "up." : "down (@reason)."); |
| 344 |
|
| 345 |
for my $cb (values %MON_NODES) { |
| 346 |
eval { $cb->($node->{id}, $up, @reason); 1 } |
| 347 |
or AE::log die => $@; |
| 348 |
} |
| 349 |
} |
| 350 |
|
| 351 |
############################################################################# |
| 352 |
# self node code |
| 353 |
|
| 354 |
sub _kill { |
| 355 |
my $port = shift; |
| 356 |
|
| 357 |
delete $PORT{$port} |
| 358 |
or return; # killing nonexistent ports is O.K. |
| 359 |
delete $PORT_DATA{$port}; |
| 360 |
|
| 361 |
my $mon = delete $LMON{$port} |
| 362 |
or !@_ |
| 363 |
or AE::log die => "unmonitored local port $port died with reason: @_"; |
| 364 |
|
| 365 |
$_->(@_) for values %$mon; |
| 366 |
} |
| 367 |
|
| 368 |
sub _monitor { |
| 369 |
return $_[2](no_such_port => "cannot monitor nonexistent port", "$NODE#$_[1]") |
| 370 |
unless exists $PORT{$_[1]}; |
| 371 |
|
| 372 |
$LMON{$_[1]}{$_[2]+0} = $_[2]; |
| 373 |
} |
| 374 |
|
| 375 |
sub _unmonitor { |
| 376 |
delete $LMON{$_[1]}{$_[2]+0} |
| 377 |
if exists $LMON{$_[1]}; |
| 378 |
} |
| 379 |
|
| 380 |
sub _secure_check { |
| 381 |
$SECURE |
| 382 |
and die "remote execution not allowed\n"; |
| 383 |
} |
| 384 |
|
| 385 |
our %NODE_REQ; |
| 386 |
|
| 387 |
%NODE_REQ = ( |
| 388 |
# "mproto" - monitoring protocol |
| 389 |
|
| 390 |
# monitoring |
| 391 |
mon0 => sub { # stop monitoring a port for another node |
| 392 |
my $portid = shift; |
| 393 |
_unmonitor undef, $portid, delete $NODE{$SRCNODE}{rmon}{$portid}; |
| 394 |
}, |
| 395 |
mon1 => sub { # start monitoring a port for another node |
| 396 |
my $portid = shift; |
| 397 |
Scalar::Util::weaken (my $node = $NODE{$SRCNODE}); |
| 398 |
_monitor undef, $portid, $node->{rmon}{$portid} = sub { |
| 399 |
delete $node->{rmon}{$portid}; |
| 400 |
$node->send (["", kil0 => $portid, @_]) |
| 401 |
if $node && $node->{transport}; |
| 402 |
}; |
| 403 |
}, |
| 404 |
# another node has killed a monitored port |
| 405 |
kil0 => sub { |
| 406 |
my $cbs = delete $NODE{$SRCNODE}{lmon}{+shift} |
| 407 |
or return; |
| 408 |
|
| 409 |
$_->(@_) for @$cbs; |
| 410 |
}, |
| 411 |
# another node wants to kill a local port |
| 412 |
kil1 => \&_kill, |
| 413 |
|
| 414 |
# "public" services - not actually public |
| 415 |
|
| 416 |
# relay message to another node / generic echo |
| 417 |
snd => sub { |
| 418 |
&snd |
| 419 |
}, |
| 420 |
# ask if a node supports the given request, only works for fixed tags |
| 421 |
can => sub { |
| 422 |
my $method = shift; |
| 423 |
snd @_, exists $NODE_REQ{$method}; |
| 424 |
}, |
| 425 |
|
| 426 |
# random utilities |
| 427 |
eval => sub { |
| 428 |
&_secure_check; |
| 429 |
my @res = do { package main; eval shift }; |
| 430 |
snd @_, "$@", @res if @_; |
| 431 |
}, |
| 432 |
time => sub { |
| 433 |
snd @_, AE::now; |
| 434 |
}, |
| 435 |
devnull => sub { |
| 436 |
# |
| 437 |
}, |
| 438 |
"" => sub { |
| 439 |
# empty messages are keepalives or similar devnull-applications |
| 440 |
}, |
| 441 |
); |
| 442 |
|
| 443 |
# the node port |
| 444 |
new AnyEvent::MP::Node::Self $NODE; # registers itself in %NODE |
| 445 |
|
| 446 |
$PORT{""} = sub { |
| 447 |
my $tag = shift; |
| 448 |
eval { &{ $NODE_REQ{$tag} ||= do { &_secure_check; load_func $tag } } }; |
| 449 |
AE::log die => "error processing node message from $SRCNODE: $@" if $@; |
| 450 |
}; |
| 451 |
|
| 452 |
our $MPROTO = 1; |
| 453 |
|
| 454 |
# tell everybody who connects our nproto |
| 455 |
push @AnyEvent::MP::Transport::HOOK_GREET, sub { |
| 456 |
$_[0]{local_greeting}{mproto} = $MPROTO; |
| 457 |
}; |
| 458 |
|
| 459 |
############################################################################# |
| 460 |
# seed management, try to keep connections to all seeds at all times |
| 461 |
|
| 462 |
our %SEED_NODE; # seed ID => node ID|undef |
| 463 |
our %NODE_SEED; # map node ID to seed ID |
| 464 |
our %SEED_CONNECT; # $seed => transport_connector | 1=connected | 2=connecting |
| 465 |
our $SEED_WATCHER; |
| 466 |
our $SEED_RETRY; |
| 467 |
|
| 468 |
sub seed_connect { |
| 469 |
my ($seed) = @_; |
| 470 |
|
| 471 |
my ($host, $port) = AnyEvent::Socket::parse_hostport $seed |
| 472 |
or Carp::croak "$seed: unparsable seed address"; |
| 473 |
|
| 474 |
AE::log 9 => "trying connect to seed node $seed."; |
| 475 |
|
| 476 |
$SEED_CONNECT{$seed} ||= AnyEvent::MP::Transport::mp_connect |
| 477 |
$host, $port, |
| 478 |
on_greeted => sub { |
| 479 |
# called after receiving remote greeting, learn remote node name |
| 480 |
|
| 481 |
# we rely on untrusted data here (the remote node name) this is |
| 482 |
# hopefully ok, as this can at most be used for DOSing, which is easy |
| 483 |
# when you can do MITM anyway. |
| 484 |
|
| 485 |
# if we connect to ourselves, nuke this seed, but make sure we act like a seed |
| 486 |
if ($_[0]{remote_node} eq $AnyEvent::MP::Kernel::NODE) { |
| 487 |
require AnyEvent::MP::Global; # every seed becomes a global node currently |
| 488 |
delete $SEED_NODE{$seed}; |
| 489 |
} else { |
| 490 |
$SEED_NODE{$seed} = $_[0]{remote_node}; |
| 491 |
$NODE_SEED{$_[0]{remote_node}} = $seed; |
| 492 |
# also start global service, if not running |
| 493 |
# we need to check here in addition to the mon_nodes below |
| 494 |
# because we might only learn late that a node is a seed |
| 495 |
# and then we might already be connected |
| 496 |
snd $_[0]{remote_node}, "g_slave" |
| 497 |
unless $_[0]{remote_greeting}{global}; |
| 498 |
} |
| 499 |
}, |
| 500 |
sub { |
| 501 |
delete $SEED_CONNECT{$seed}; |
| 502 |
} |
| 503 |
; |
| 504 |
} |
| 505 |
|
| 506 |
sub seed_all { |
| 507 |
my @seeds = grep |
| 508 |
!exists $SEED_CONNECT{$_} |
| 509 |
&& !(defined $SEED_NODE{$_} && node_is_up $SEED_NODE{$_}), |
| 510 |
keys %SEED_NODE; |
| 511 |
|
| 512 |
if (@seeds) { |
| 513 |
# start connection attempt for every seed we are not connected to yet |
| 514 |
seed_connect $_ |
| 515 |
for @seeds; |
| 516 |
|
| 517 |
$SEED_RETRY = $SEED_RETRY * 2 + rand; |
| 518 |
$SEED_RETRY = $AnyEvent::MP::Kernel::CONFIG->{monitor_timeout} |
| 519 |
if $SEED_RETRY > $AnyEvent::MP::Kernel::CONFIG->{monitor_timeout}; |
| 520 |
|
| 521 |
$SEED_WATCHER = AE::timer $SEED_RETRY, 0, \&seed_all; |
| 522 |
|
| 523 |
} else { |
| 524 |
# all seeds connected or connecting, no need to restart timer |
| 525 |
undef $SEED_WATCHER; |
| 526 |
} |
| 527 |
} |
| 528 |
|
| 529 |
sub seed_again { |
| 530 |
$SEED_RETRY = 1; |
| 531 |
$SEED_WATCHER ||= AE::timer 1, 0, \&seed_all; |
| 532 |
} |
| 533 |
|
| 534 |
# sets new seed list, starts connecting |
| 535 |
sub set_seeds(@) { |
| 536 |
%SEED_NODE = (); |
| 537 |
%NODE_SEED = (); |
| 538 |
%SEED_CONNECT = (); |
| 539 |
|
| 540 |
@SEED_NODE{@_} = (); |
| 541 |
|
| 542 |
seed_all; |
| 543 |
} |
| 544 |
|
| 545 |
mon_nodes sub { |
| 546 |
return unless exists $NODE_SEED{$_[0]}; |
| 547 |
|
| 548 |
if ($_[1]) { |
| 549 |
# each time a connection to a seed node goes up, make |
| 550 |
# sure it runs the global service. |
| 551 |
snd $_[0], "g_slave" |
| 552 |
unless $NODE{$_[0]}{transport}{remote_greeting}{global}; |
| 553 |
} else { |
| 554 |
# if we lost the connection to a seed node, make sure we are seeding |
| 555 |
seed_again; |
| 556 |
} |
| 557 |
}; |
| 558 |
|
| 559 |
############################################################################# |
| 560 |
# keepalive code - used to kepe conenctions to certain nodes alive |
| 561 |
# only used by global code atm., but ought to be exposed somehow. |
| 562 |
#TODO: should probbaly be done directly by node objects |
| 563 |
|
| 564 |
our $KEEPALIVE_RETRY; |
| 565 |
our $KEEPALIVE_WATCHER; |
| 566 |
our %KEEPALIVE; # we want to keep these nodes alive |
| 567 |
our %KEEPALIVE_DOWN; # nodes that are down currently |
| 568 |
|
| 569 |
sub keepalive_all { |
| 570 |
AE::log 9 => "keepalive: trying to establish connections with: " |
| 571 |
. (join " ", keys %KEEPALIVE_DOWN) |
| 572 |
. "."; |
| 573 |
|
| 574 |
(add_node $_)->connect |
| 575 |
for keys %KEEPALIVE_DOWN; |
| 576 |
|
| 577 |
$KEEPALIVE_RETRY = $KEEPALIVE_RETRY * 2 + rand; |
| 578 |
$KEEPALIVE_RETRY = $AnyEvent::MP::Kernel::CONFIG->{monitor_timeout} |
| 579 |
if $KEEPALIVE_RETRY > $AnyEvent::MP::Kernel::CONFIG->{monitor_timeout}; |
| 580 |
|
| 581 |
$KEEPALIVE_WATCHER = AE::timer $KEEPALIVE_RETRY, 0, \&keepalive_all; |
| 582 |
} |
| 583 |
|
| 584 |
sub keepalive_again { |
| 585 |
$KEEPALIVE_RETRY = 1; |
| 586 |
keepalive_all; |
| 587 |
} |
| 588 |
|
| 589 |
sub keepalive_add { |
| 590 |
return if $KEEPALIVE{$_[0]}++; |
| 591 |
|
| 592 |
return if node_is_up $_[0]; |
| 593 |
undef $KEEPALIVE_DOWN{$_[0]}; |
| 594 |
keepalive_again; |
| 595 |
} |
| 596 |
|
| 597 |
sub keepalive_del { |
| 598 |
return if --$KEEPALIVE{$_[0]}; |
| 599 |
|
| 600 |
delete $KEEPALIVE {$_[0]}; |
| 601 |
delete $KEEPALIVE_DOWN{$_[0]}; |
| 602 |
|
| 603 |
undef $KEEPALIVE_WATCHER |
| 604 |
unless %KEEPALIVE_DOWN; |
| 605 |
} |
| 606 |
|
| 607 |
mon_nodes sub { |
| 608 |
return unless exists $KEEPALIVE{$_[0]}; |
| 609 |
|
| 610 |
if ($_[1]) { |
| 611 |
delete $KEEPALIVE_DOWN{$_[0]}; |
| 612 |
|
| 613 |
undef $KEEPALIVE_WATCHER |
| 614 |
unless %KEEPALIVE_DOWN; |
| 615 |
} else { |
| 616 |
# lost the conenction, try to connect again |
| 617 |
undef $KEEPALIVE_DOWN{$_[0]}; |
| 618 |
keepalive_again; |
| 619 |
} |
| 620 |
}; |
| 621 |
|
| 622 |
############################################################################# |
| 623 |
# talk with/to global nodes |
| 624 |
|
| 625 |
# protocol messages: |
| 626 |
# |
| 627 |
# sent by all slave nodes (slave to master) |
| 628 |
# g_slave database - make other global node master of the sender |
| 629 |
# |
| 630 |
# sent by any node to global nodes |
| 631 |
# g_set database - set whole database |
| 632 |
# g_upd family set del - update single family |
| 633 |
# g_del family key - delete key from database |
| 634 |
# g_get family key reply... - send reply with data |
| 635 |
# |
| 636 |
# send by global nodes |
| 637 |
# g_global - node became global, similar to global=1 greeting |
| 638 |
# |
| 639 |
# database families |
| 640 |
# "'l" -> node -> listeners |
| 641 |
# "'g" -> node -> undef |
| 642 |
# ... |
| 643 |
# |
| 644 |
|
| 645 |
# used on all nodes: |
| 646 |
our $MASTER; # the global node we bind ourselves to |
| 647 |
our $MASTER_MON; |
| 648 |
our %LOCAL_DB; # this node database |
| 649 |
|
| 650 |
our %GLOBAL_DB; # all local databases, merged - empty on non-global nodes |
| 651 |
|
| 652 |
our $GPROTO = 1; |
| 653 |
|
| 654 |
# tell everybody who connects our nproto |
| 655 |
push @AnyEvent::MP::Transport::HOOK_GREET, sub { |
| 656 |
$_[0]{local_greeting}{gproto} = $GPROTO; |
| 657 |
}; |
| 658 |
|
| 659 |
############################################################################# |
| 660 |
# master selection |
| 661 |
|
| 662 |
# master requests |
| 663 |
our %GLOBAL_REQ; # $id => \@req |
| 664 |
|
| 665 |
sub global_req_add { |
| 666 |
my ($id, $req) = @_; |
| 667 |
|
| 668 |
return if exists $GLOBAL_REQ{$id}; |
| 669 |
|
| 670 |
$GLOBAL_REQ{$id} = $req; |
| 671 |
|
| 672 |
snd $MASTER, @$req |
| 673 |
if $MASTER; |
| 674 |
} |
| 675 |
|
| 676 |
sub global_req_del { |
| 677 |
delete $GLOBAL_REQ{$_[0]}; |
| 678 |
} |
| 679 |
|
| 680 |
################################# |
| 681 |
# master rpc |
| 682 |
|
| 683 |
our %GLOBAL_RES; |
| 684 |
our $GLOBAL_RES_ID = "a"; |
| 685 |
|
| 686 |
sub global_call { |
| 687 |
my $id = ++$GLOBAL_RES_ID; |
| 688 |
$GLOBAL_RES{$id} = pop; |
| 689 |
global_req_add $id, [@_, $id]; |
| 690 |
} |
| 691 |
|
| 692 |
$NODE_REQ{g_reply} = sub { |
| 693 |
my $id = shift; |
| 694 |
global_req_del $id; |
| 695 |
my $cb = delete $GLOBAL_RES{$id} |
| 696 |
or return; |
| 697 |
&$cb |
| 698 |
}; |
| 699 |
|
| 700 |
################################# |
| 701 |
|
| 702 |
sub g_find { |
| 703 |
global_req_add "g_find $_[0]", [g_find => $_[0]]; |
| 704 |
} |
| 705 |
|
| 706 |
# reply for g_find started in Node.pm |
| 707 |
$NODE_REQ{g_found} = sub { |
| 708 |
global_req_del "g_find $_[0]"; |
| 709 |
|
| 710 |
my $node = $NODE{$_[0]} or return; |
| 711 |
|
| 712 |
$node->connect_to ($_[1]); |
| 713 |
}; |
| 714 |
|
| 715 |
sub master_set { |
| 716 |
$MASTER = $_[0]; |
| 717 |
|
| 718 |
snd $MASTER, g_slave => \%LOCAL_DB; |
| 719 |
|
| 720 |
# (re-)send queued requests |
| 721 |
snd $MASTER, @$_ |
| 722 |
for values %GLOBAL_REQ; |
| 723 |
} |
| 724 |
|
| 725 |
sub master_search { |
| 726 |
#TODO: should also look for other global nodes, but we don't know them #d# |
| 727 |
for (keys %NODE_SEED) { |
| 728 |
if (node_is_up $_) { |
| 729 |
master_set $_; |
| 730 |
return; |
| 731 |
} |
| 732 |
} |
| 733 |
|
| 734 |
$MASTER_MON = mon_nodes sub { |
| 735 |
return unless $_[1]; # we are only interested in node-ups |
| 736 |
return unless $NODE_SEED{$_[0]}; # we are only interested in seed nodes |
| 737 |
|
| 738 |
master_set $_[0]; |
| 739 |
|
| 740 |
$MASTER_MON = mon_nodes sub { |
| 741 |
if ($_[0] eq $MASTER && !$_[1]) { |
| 742 |
undef $MASTER; |
| 743 |
master_search (); |
| 744 |
} |
| 745 |
}; |
| 746 |
}; |
| 747 |
} |
| 748 |
|
| 749 |
# other node wants to make us the master |
| 750 |
$NODE_REQ{g_slave} = sub { |
| 751 |
my ($db) = @_; |
| 752 |
|
| 753 |
# load global module and redo the request |
| 754 |
require AnyEvent::MP::Global; |
| 755 |
&{ $NODE_REQ{g_slave} } |
| 756 |
}; |
| 757 |
|
| 758 |
############################################################################# |
| 759 |
# local database operations |
| 760 |
|
| 761 |
# local database management |
| 762 |
|
| 763 |
sub db_set($$;$) { |
| 764 |
my ($family, $subkey) = @_; |
| 765 |
|
| 766 |
# if (ref $_[1]) { |
| 767 |
# # bulk |
| 768 |
# my @del = grep exists $LOCAL_DB{$_[0]}{$_}, keys ${ $_[1] }; |
| 769 |
# $LOCAL_DB{$_[0]} = $_[1]; |
| 770 |
# snd $MASTER, g_upd => $_[0] => $_[1], \@del |
| 771 |
# if defined $MASTER; |
| 772 |
# } else { |
| 773 |
# single-key |
| 774 |
$LOCAL_DB{$family}{$subkey} = $_[2]; |
| 775 |
snd $MASTER, g_upd => $family => { $subkey => $_[2] } |
| 776 |
if defined $MASTER; |
| 777 |
# } |
| 778 |
|
| 779 |
defined wantarray |
| 780 |
and Guard::guard { db_del $family => $subkey } |
| 781 |
} |
| 782 |
|
| 783 |
sub db_del($@) { |
| 784 |
my $family = shift; |
| 785 |
|
| 786 |
my @del = grep exists $LOCAL_DB{$family}{$_}, @_; |
| 787 |
|
| 788 |
return unless @del; |
| 789 |
|
| 790 |
delete @{ $LOCAL_DB{$family} }{@del}; |
| 791 |
snd $MASTER, g_upd => $family => undef, \@del |
| 792 |
if defined $MASTER; |
| 793 |
} |
| 794 |
|
| 795 |
# database query |
| 796 |
|
| 797 |
sub db_family { |
| 798 |
my ($family, $cb) = @_; |
| 799 |
global_call g_db_family => $family, $cb; |
| 800 |
} |
| 801 |
|
| 802 |
sub db_keys { |
| 803 |
my ($family, $cb) = @_; |
| 804 |
global_call g_db_keys => $family, $cb; |
| 805 |
} |
| 806 |
|
| 807 |
sub db_values { |
| 808 |
my ($family, $cb) = @_; |
| 809 |
global_call g_db_values => $family, $cb; |
| 810 |
} |
| 811 |
|
| 812 |
# database monitoring |
| 813 |
|
| 814 |
our %LOCAL_MON; # f, reply |
| 815 |
our %MON_DB; # f, k, value |
| 816 |
|
| 817 |
sub db_mon($@) { |
| 818 |
my ($family, $cb) = @_; |
| 819 |
|
| 820 |
if (my $db = $MON_DB{$family}) { |
| 821 |
# we already monitor, so create a "dummy" change event |
| 822 |
# this is postponed, which might be too late (we could process |
| 823 |
# change events), so disable the callback at first |
| 824 |
$LOCAL_MON{$family}{$cb+0} = sub { }; |
| 825 |
AE::postpone { |
| 826 |
return unless exists $LOCAL_MON{$family}{$cb+0}; # guard might have gone away already |
| 827 |
|
| 828 |
# set actual callback |
| 829 |
$LOCAL_MON{$family}{$cb+0} = $cb; |
| 830 |
$cb->($db, [keys %$db]); |
| 831 |
}; |
| 832 |
} else { |
| 833 |
# new monitor, request chg1 from upstream |
| 834 |
$LOCAL_MON{$family}{$cb+0} = $cb; |
| 835 |
global_req_add "mon1 $family" => [g_mon1 => $family]; |
| 836 |
$MON_DB{$family} = {}; |
| 837 |
} |
| 838 |
|
| 839 |
defined wantarray |
| 840 |
and Guard::guard { |
| 841 |
my $mon = $LOCAL_MON{$family}; |
| 842 |
delete $mon->{$cb+0}; |
| 843 |
|
| 844 |
unless (%$mon) { |
| 845 |
global_req_del "mon1 $family"; |
| 846 |
|
| 847 |
# no global_req, because we don't care if we are not connected |
| 848 |
snd $MASTER, g_mon0 => $family |
| 849 |
if $MASTER; |
| 850 |
|
| 851 |
delete $LOCAL_MON{$family}; |
| 852 |
delete $MON_DB{$family}; |
| 853 |
} |
| 854 |
} |
| 855 |
} |
| 856 |
|
| 857 |
# full update |
| 858 |
$NODE_REQ{g_chg1} = sub { |
| 859 |
return unless $SRCNODE eq $MASTER; |
| 860 |
my ($f, $ndb) = @_; |
| 861 |
|
| 862 |
my $db = $MON_DB{$f}; |
| 863 |
my (@a, @c, @d); |
| 864 |
|
| 865 |
# add or replace keys |
| 866 |
while (my ($k, $v) = each %$ndb) { |
| 867 |
exists $db->{$k} |
| 868 |
? push @c, $k |
| 869 |
: push @a, $k; |
| 870 |
$db->{$k} = $v; |
| 871 |
} |
| 872 |
|
| 873 |
# delete keys that are no longer present |
| 874 |
for (grep !exists $ndb->{$_}, keys %$db) { |
| 875 |
delete $db->{$_}; |
| 876 |
push @d, $_; |
| 877 |
} |
| 878 |
|
| 879 |
$_->($db, \@a, \@c, \@d) |
| 880 |
for values %{ $LOCAL_MON{$_[0]} }; |
| 881 |
}; |
| 882 |
|
| 883 |
# incremental update |
| 884 |
$NODE_REQ{g_chg2} = sub { |
| 885 |
return unless $SRCNODE eq $MASTER; |
| 886 |
my ($family, $set, $del) = @_; |
| 887 |
|
| 888 |
my $db = $MON_DB{$family}; |
| 889 |
|
| 890 |
my (@a, @c); |
| 891 |
|
| 892 |
while (my ($k, $v) = each %$set) { |
| 893 |
exists $db->{$k} |
| 894 |
? push @c, $k |
| 895 |
: push @a, $k; |
| 896 |
$db->{$k} = $v; |
| 897 |
} |
| 898 |
|
| 899 |
delete @$db{@$del}; |
| 900 |
|
| 901 |
$_->($db, \@a, \@c, $del) |
| 902 |
for values %{ $LOCAL_MON{$family} }; |
| 903 |
}; |
| 904 |
|
| 905 |
############################################################################# |
| 906 |
# configure |
| 907 |
|
| 908 |
sub nodename { |
| 909 |
require POSIX; |
| 910 |
(POSIX::uname ())[1] |
| 911 |
} |
| 912 |
|
| 913 |
sub _resolve($) { |
| 914 |
my ($nodeid) = @_; |
| 915 |
|
| 916 |
my $cv = AE::cv; |
| 917 |
my @res; |
| 918 |
|
| 919 |
$cv->begin (sub { |
| 920 |
my %seen; |
| 921 |
my @refs; |
| 922 |
for (sort { $a->[0] <=> $b->[0] } @res) { |
| 923 |
push @refs, $_->[1] unless $seen{$_->[1]}++ |
| 924 |
} |
| 925 |
shift->send (@refs); |
| 926 |
}); |
| 927 |
|
| 928 |
my $idx; |
| 929 |
for my $t (split /,/, $nodeid) { |
| 930 |
my $pri = ++$idx; |
| 931 |
|
| 932 |
$t = length $t ? nodename . ":$t" : nodename |
| 933 |
if $t =~ /^\d*$/; |
| 934 |
|
| 935 |
my ($host, $port) = AnyEvent::Socket::parse_hostport $t, 0 |
| 936 |
or Carp::croak "$t: unparsable transport descriptor"; |
| 937 |
|
| 938 |
$port = "0" if $port eq "*"; |
| 939 |
|
| 940 |
if ($host eq "*") { |
| 941 |
$cv->begin; |
| 942 |
|
| 943 |
my $get_addr = sub { |
| 944 |
my @addr; |
| 945 |
|
| 946 |
require Net::Interface; |
| 947 |
|
| 948 |
# Net::Interface hangs on some systems, so hope for the best |
| 949 |
local $SIG{ALRM} = 'DEFAULT'; |
| 950 |
alarm 2; |
| 951 |
|
| 952 |
for my $if (Net::Interface->interfaces) { |
| 953 |
# we statically lower-prioritise ipv6 here, TODO :() |
| 954 |
for $_ ($if->address (Net::Interface::AF_INET ())) { |
| 955 |
next if /^\x7f/; # skip localhost etc. |
| 956 |
push @addr, $_; |
| 957 |
} |
| 958 |
for ($if->address (Net::Interface::AF_INET6 ())) { |
| 959 |
#next if $if->scope ($_) <= 2; |
| 960 |
next unless /^[\x20-\x3f\xfc\xfd]/; # global unicast, site-local unicast |
| 961 |
push @addr, $_; |
| 962 |
} |
| 963 |
} |
| 964 |
|
| 965 |
alarm 0; |
| 966 |
|
| 967 |
@addr |
| 968 |
}; |
| 969 |
|
| 970 |
my @addr; |
| 971 |
|
| 972 |
if (AnyEvent::WIN32) { |
| 973 |
@addr = $get_addr->(); |
| 974 |
} else { |
| 975 |
# use a child process, as Net::Interface is big, and we need it only once. |
| 976 |
|
| 977 |
pipe my $r, my $w |
| 978 |
or die "pipe: $!"; |
| 979 |
|
| 980 |
if (fork eq 0) { |
| 981 |
close $r; |
| 982 |
syswrite $w, pack "(C/a*)*", $get_addr->(); |
| 983 |
require POSIX; |
| 984 |
POSIX::_exit (0); |
| 985 |
} else { |
| 986 |
close $w; |
| 987 |
|
| 988 |
my $addr; |
| 989 |
|
| 990 |
1 while sysread $r, $addr, 1024, length $addr; |
| 991 |
|
| 992 |
@addr = unpack "(C/a*)*", $addr; |
| 993 |
} |
| 994 |
} |
| 995 |
|
| 996 |
for my $ip (@addr) { |
| 997 |
push @res, [ |
| 998 |
$pri += 1e-5, |
| 999 |
AnyEvent::Socket::format_hostport AnyEvent::Socket::format_address $ip, $port |
| 1000 |
]; |
| 1001 |
} |
| 1002 |
$cv->end; |
| 1003 |
} else { |
| 1004 |
$cv->begin; |
| 1005 |
AnyEvent::Socket::resolve_sockaddr $host, $port, "tcp", 0, undef, sub { |
| 1006 |
for (@_) { |
| 1007 |
my ($service, $host) = AnyEvent::Socket::unpack_sockaddr $_->[3]; |
| 1008 |
push @res, [ |
| 1009 |
$pri += 1e-5, |
| 1010 |
AnyEvent::Socket::format_hostport AnyEvent::Socket::format_address $host, $service |
| 1011 |
]; |
| 1012 |
} |
| 1013 |
$cv->end; |
| 1014 |
}; |
| 1015 |
} |
| 1016 |
} |
| 1017 |
|
| 1018 |
$cv->end; |
| 1019 |
|
| 1020 |
$cv |
| 1021 |
} |
| 1022 |
|
| 1023 |
sub configure(@) { |
| 1024 |
unshift @_, "profile" if @_ & 1; |
| 1025 |
my (%kv) = @_; |
| 1026 |
|
| 1027 |
my $profile = delete $kv{profile}; |
| 1028 |
|
| 1029 |
$profile = nodename |
| 1030 |
unless defined $profile; |
| 1031 |
|
| 1032 |
$CONFIG = AnyEvent::MP::Config::find_profile $profile, %kv; |
| 1033 |
|
| 1034 |
$SECURE = $CONFIG->{secure}; |
| 1035 |
|
| 1036 |
my $node = exists $CONFIG->{nodeid} ? $CONFIG->{nodeid} : "$profile/"; |
| 1037 |
|
| 1038 |
$node or Carp::croak "$node: illegal node ID (see AnyEvent::MP manpage for syntax)\n"; |
| 1039 |
|
| 1040 |
my $node_obj = delete $NODE{$NODE}; # we do not support doing stuff before configure |
| 1041 |
|
| 1042 |
$NODE = $node; |
| 1043 |
|
| 1044 |
$NODE =~ s/%n/nodename/ge; |
| 1045 |
|
| 1046 |
if ($NODE =~ s!(?:(?<=/)$|%u)!$RUNIQ!g) { |
| 1047 |
# nodes with randomised node names do not need randomised port names |
| 1048 |
$UNIQ = ""; |
| 1049 |
} |
| 1050 |
|
| 1051 |
$node_obj->{id} = $NODE; |
| 1052 |
$NODE{$NODE} = $node_obj; |
| 1053 |
|
| 1054 |
my $seeds = $CONFIG->{seeds}; |
| 1055 |
my $binds = $CONFIG->{binds}; |
| 1056 |
|
| 1057 |
$binds ||= ["*"]; |
| 1058 |
|
| 1059 |
AE::log 8 => "node $NODE starting up."; |
| 1060 |
|
| 1061 |
$BINDS = []; |
| 1062 |
%BINDS = (); |
| 1063 |
|
| 1064 |
for (map _resolve $_, @$binds) { |
| 1065 |
for my $bind ($_->recv) { |
| 1066 |
my ($host, $port) = AnyEvent::Socket::parse_hostport $bind |
| 1067 |
or Carp::croak "$bind: unparsable local bind address"; |
| 1068 |
|
| 1069 |
my $listener = AnyEvent::MP::Transport::mp_server |
| 1070 |
$host, |
| 1071 |
$port, |
| 1072 |
prepare => sub { |
| 1073 |
my (undef, $host, $port) = @_; |
| 1074 |
$bind = AnyEvent::Socket::format_hostport $host, $port; |
| 1075 |
0 |
| 1076 |
}, |
| 1077 |
; |
| 1078 |
$BINDS{$bind} = $listener; |
| 1079 |
push @$BINDS, $bind; |
| 1080 |
} |
| 1081 |
} |
| 1082 |
|
| 1083 |
db_set "'l" => $NODE => $BINDS; |
| 1084 |
|
| 1085 |
AE::log 8 => "node listens on [@$BINDS]."; |
| 1086 |
|
| 1087 |
# connect to all seednodes |
| 1088 |
set_seeds map $_->recv, map _resolve $_, @$seeds; |
| 1089 |
master_search; |
| 1090 |
|
| 1091 |
# save gobs of memory |
| 1092 |
undef &_resolve; |
| 1093 |
*configure = sub (@){ }; |
| 1094 |
|
| 1095 |
for (@{ $CONFIG->{services} }) { |
| 1096 |
if (ref) { |
| 1097 |
my ($func, @args) = @$_; |
| 1098 |
(load_func $func)->(@args); |
| 1099 |
} elsif (s/::$//) { |
| 1100 |
eval "require $_"; |
| 1101 |
die $@ if $@; |
| 1102 |
} else { |
| 1103 |
(load_func $_)->(); |
| 1104 |
} |
| 1105 |
} |
| 1106 |
|
| 1107 |
eval "#line 1 \"(eval configure parameter)\"\n$CONFIG->{eval}"; |
| 1108 |
die "$@" if $@; |
| 1109 |
} |
| 1110 |
|
| 1111 |
=back |
| 1112 |
|
| 1113 |
=head1 LOGGING |
| 1114 |
|
| 1115 |
AnyEvent::MP::Kernel logs high-level information about the current node, |
| 1116 |
when nodes go up and down, and most runtime errors. It also logs some |
| 1117 |
debugging and trace messages about network maintainance, such as seed |
| 1118 |
connections and global node management. |
| 1119 |
|
| 1120 |
=head1 SEE ALSO |
| 1121 |
|
| 1122 |
L<AnyEvent::MP>. |
| 1123 |
|
| 1124 |
=head1 AUTHOR |
| 1125 |
|
| 1126 |
Marc Lehmann <schmorp@schmorp.de> |
| 1127 |
http://home.schmorp.de/ |
| 1128 |
|
| 1129 |
=cut |
| 1130 |
|
| 1131 |
1 |
| 1132 |
|
