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1.1 |
=head1 NAME |
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AnyEvent::MP::Global - some network-global services |
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=head1 SYNOPSIS |
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use AnyEvent::MP::Global; |
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=head1 DESCRIPTION |
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1.15 |
This module maintains a fully-meshed network, if possible, and tries to |
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ensure that we are connected to at least one other node. |
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1.1 |
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1.15 |
It also manages named port groups - ports can register themselves in any |
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number of groups that will be available network-wide, which is great for |
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discovering services. |
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1.1 |
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1.15 |
Running it on one node will automatically run it on all nodes, although, |
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at the moment, the global service is started by default anyways. |
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1.3 |
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1.1 |
=head1 GLOBALS AND FUNCTIONS |
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=over 4 |
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=cut |
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package AnyEvent::MP::Global; |
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use common::sense; |
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use Carp (); |
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1.8 |
use AnyEvent (); |
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1.4 |
use AnyEvent::Util (); |
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1.1 |
use AnyEvent::MP; |
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use AnyEvent::MP::Kernel; |
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1.22 |
use AnyEvent::MP::Transport (); |
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1.1 |
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1.20 |
use base "Exporter"; |
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our @EXPORT = qw( |
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grp_reg |
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grp_get |
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grp_mon |
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); |
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1.1 |
our $VERSION = $AnyEvent::MP::VERSION; |
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1.8 |
our %addr; # port ID => [address...] mapping |
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1.4 |
our %port; # our rendezvous port on the other side |
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our %lreg; # local registry, name => [pid...] |
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1.20 |
our %lmon; # local registry monitoring name,pid => mon |
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our %greg; # global regstry, name => pid => undef |
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1.22 |
our %gmon; # group monitoring, group => [$cb...] |
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1.4 |
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1.8 |
our $nodecnt; |
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1.5 |
$AnyEvent::MP::Kernel::WARN->(7, "starting global service."); |
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1.8 |
############################################################################# |
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# seednodes |
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1.26 |
our $MASTER; # our current master (which we regularly query for net updates) |
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our %SEEDME; # $node => $port |
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1.8 |
our @SEEDS; |
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1.22 |
our %SEEDS; # just to check whether a seed is a seed |
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1.14 |
our %SEED_CONNECT; |
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1.8 |
our $SEED_WATCHER; |
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1.22 |
push @AnyEvent::MP::Transport::HOOK_CONNECT, sub { |
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my $peer = $_[0]{local_greeting}{peeraddr}; |
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return unless exists $SEEDS{$peer}; |
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$SEED_CONNECT{$peer} = 2; |
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}; |
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1.27 |
push @AnyEvent::MP::Transport::HOOK_GREETING, sub { |
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# we rely on untrusted data here (the remote node name) |
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# this is hopefully ok, as we override it on successful |
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# connects, and this can at most be used for DOSing, |
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# which is easy when you can do MITM. |
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my $peer = $_[0]{local_greeting}{peeraddr}; |
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return unless exists $SEEDS{$peer}; |
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$SEEDS{$peer} ||= $_[0]{remote_node}; |
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}; |
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1.22 |
push @AnyEvent::MP::Transport::HOOK_CONNECTED, sub { |
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my $peer = $_[0]{local_greeting}{peeraddr}; |
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return unless exists $SEEDS{$peer}; |
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$SEEDS{$peer} = $_[0]{remote_node}; |
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}; |
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push @AnyEvent::MP::Transport::HOOK_DESTROY, sub { |
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delete $SEED_CONNECT{$_[0]{local_greeting}{peeraddr}}; |
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1.24 |
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# check if we contacted ourselves, so nuke this seed |
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1.25 |
if (exists $_[0]{seed} && $_[0]{remote_node} eq $AnyEvent::MP::Kernel::NODE) { |
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# $AnyEvent::MP::Kernel::WARN->(0,"avoiding seed $_[0]{seed}\n");#d# |
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delete $SEEDS{$_[0]{seed}}; |
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1.24 |
} |
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1.22 |
}; |
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1.8 |
sub seed_connect { |
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my ($seed) = @_; |
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my ($host, $port) = AnyEvent::Socket::parse_hostport $seed |
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or Carp::croak "$seed: unparsable seed address"; |
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1.22 |
return if $SEED_CONNECT{$seed}; |
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1.27 |
return if defined $SEEDS{$seed} && node_is_up $SEEDS{$seed}; |
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1.22 |
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$AnyEvent::MP::Kernel::WARN->(9, "trying connect to seed node $seed."); |
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1.8 |
# ughhh |
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1.14 |
$SEED_CONNECT{$seed} ||= AnyEvent::MP::Transport::mp_connect $host, $port, |
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seed => $seed, |
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1.8 |
sub { |
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1.22 |
$SEED_CONNECT{$seed} = 1; |
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1.8 |
}, |
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; |
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} |
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sub more_seeding { |
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1.22 |
my $int = List::Util::max 1, |
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$AnyEvent::MP::Kernel::CONFIG->{connect_interval} |
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* ($nodecnt ? keys %AnyEvent::MP::Kernel::NODE : 1) |
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- rand; |
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$SEED_WATCHER = AE::timer $int, 0, \&more_seeding; |
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@SEEDS = keys %SEEDS unless @SEEDS; |
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1.8 |
return unless @SEEDS; |
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1.22 |
seed_connect splice @SEEDS, rand @SEEDS, 1; |
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1.8 |
} |
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sub set_seeds(@) { |
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1.22 |
@SEEDS{@_} = (); |
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1.8 |
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$SEED_WATCHER ||= AE::timer 5, $AnyEvent::MP::Kernel::MONITOR_TIMEOUT, \&more_seeding; |
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1.29 |
after 0.100 * rand, \&more_seeding |
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for 1 .. keys %SEEDS; |
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1.8 |
} |
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1.26 |
sub up_seeds() { |
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grep node_is_up $_, values %SEEDS |
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} |
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sub node_is_seed($) { |
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grep $_ eq $_[0], grep defined, values %SEEDS |
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} |
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1.22 |
# returns all (up) seed nodes, or all nodes if no seednodes are up/known |
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1.26 |
sub route_nodes { |
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my @seeds = up_seeds; |
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1.22 |
@seeds = up_nodes unless @seeds; |
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@seeds |
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} |
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1.8 |
############################################################################# |
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1.20 |
sub _change { |
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my ($group, $add, $del) = @_; |
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my $kv = $greg{$group} ||= {}; |
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delete @$kv{@$del}; |
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@$kv{@$add} = (); |
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my $ports = [keys %$kv]; |
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$_->($ports, $add, $del) for @{ $gmon{$group} }; |
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} |
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1.4 |
sub unreg_groups($) { |
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1.8 |
my ($node) = @_; |
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1.4 |
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1.8 |
my $qr = qr/^\Q$node\E(?:#|$)/; |
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1.20 |
my @del; |
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1.4 |
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1.20 |
while (my ($group, $ports) = each %greg) { |
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@del = grep /$qr/, keys %$ports; |
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_change $group, [], \@del |
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if @del; |
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1.4 |
} |
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} |
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sub set_groups($$) { |
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1.8 |
my ($node, $lreg) = @_; |
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1.5 |
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1.6 |
while (my ($k, $v) = each %$lreg) { |
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1.20 |
_change $k, $v, []; |
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1.6 |
} |
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1.4 |
} |
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1.20 |
=item $guard = grp_reg $group, $port |
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1.4 |
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Register the given (local!) port in the named global group C<$group>. |
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The port will be unregistered automatically when the port is destroyed. |
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When not called in void context, then a guard object will be returned that |
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will also cause the name to be unregistered when destroyed. |
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=cut |
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# unregister local port |
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sub unregister { |
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my ($port, $group) = @_; |
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delete $lmon{"$group\x00$port"}; |
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@{ $lreg{$group} } = grep $_ ne $port, @{ $lreg{$group} }; |
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1.20 |
_change $group, [], [$port]; |
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1.4 |
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1.20 |
snd $_, reg0 => $group, $port |
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1.4 |
for values %port; |
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} |
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# register local port |
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1.20 |
sub grp_reg($$) { |
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my ($group, $port) = @_; |
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1.4 |
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port_is_local $port |
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1.20 |
or Carp::croak "AnyEvent::MP::Global::grp_reg can only be called for local ports, caught"; |
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grep $_ eq $port, @{ $lreg{$group} } |
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and Carp::croak "'$group': group already registered, cannot register a second time"; |
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1.4 |
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$lmon{"$group\x00$port"} = mon $port, sub { unregister $port, $group }; |
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push @{ $lreg{$group} }, $port; |
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1.20 |
snd $_, reg1 => $group, $port |
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1.4 |
for values %port; |
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1.20 |
_change $group, [$port], []; |
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1.4 |
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wantarray && AnyEvent::Util::guard { unregister $port, $group } |
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} |
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1.20 |
=item $ports = grp_get $group |
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1.15 |
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Returns all the ports currently registered to the given group (as |
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1.20 |
read-only(!) array reference). When the group has no registered members, |
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1.15 |
return C<undef>. |
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=cut |
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1.20 |
sub grp_get($) { |
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my @ports = keys %{ $greg{$_[0]} }; |
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@ports ? \@ports : undef |
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} |
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=item $guard = grp_mon $group, $callback->($ports, $add, $del) |
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Installs a monitor on the given group. Each time there is a change it |
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will be called with the current group members as an arrayref as the |
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first argument. The second argument only contains ports added, the third |
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argument only ports removed. |
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Unlike C<grp_get>, all three arguments will always be array-refs, even if |
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the array is empty. None of the arrays must be modified in any way. |
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The first invocation will be with the first two arguments set to the |
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current members, as if all of them were just added, but only when the |
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group is atcually non-empty. |
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Optionally returns a guard object that uninstalls the watcher when it is |
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destroyed. |
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=cut |
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sub grp_mon($$) { |
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my ($grp, $cb) = @_; |
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AnyEvent::MP::Kernel::delay sub { |
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return unless $cb; |
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push @{ $gmon{$grp} }, $cb; |
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$cb->(((grp_get $grp) || return) x 2, []); |
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}; |
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defined wantarray && AnyEvent::Util::::guard { |
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my @mon = grep $_ != $cb, @{ delete $gmon{$grp} }; |
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$gmon{$grp} = \@mon if @mon; |
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undef $cb; |
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} |
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1.15 |
} |
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1.4 |
sub start_node { |
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1.8 |
my ($node) = @_; |
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1.4 |
|
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1.8 |
return if exists $port{$node}; |
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return if $node eq $NODE; # do not connect to ourselves |
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1.4 |
|
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# establish connection |
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1.8 |
my $port = $port{$node} = spawn $node, "AnyEvent::MP::Global::connect", 0, $NODE; |
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1.4 |
mon $port, sub { |
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1.8 |
unreg_groups $node; |
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delete $port{$node}; |
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1.4 |
}; |
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1.8 |
|
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1.10 |
snd $port, addr => $AnyEvent::MP::Kernel::LISTENER; |
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1.17 |
snd $port, nodes => \%addr if %addr; |
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1.8 |
snd $port, set => \%lreg if %lreg; |
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1.4 |
} |
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1.3 |
|
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1.5 |
# other nodes connect via this |
311 |
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1.3 |
sub connect { |
312 |
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1.8 |
my ($version, $node) = @_; |
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1.1 |
|
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1.3 |
# monitor them, silently die |
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1.26 |
mon $node, psub { |
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delete $SEEDME{$node}; |
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kil $SELF; |
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}; |
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1.3 |
|
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1.4 |
rcv $SELF, |
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1.8 |
addr => sub { |
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my $addresses = shift; |
323 |
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1.14 |
$AnyEvent::MP::Kernel::WARN->(9, "$node told us its addresses (@$addresses)."); |
324 |
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1.8 |
$addr{$node} = $addresses; |
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1.9 |
|
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1.28 |
for my $node (keys %SEEDME) { |
327 |
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1.26 |
my $port = $port{$node}; |
328 |
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snd $port, nodes => { $node => $addresses }; |
329 |
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1.9 |
} |
330 |
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1.8 |
}, |
331 |
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1.17 |
nodes => sub { |
332 |
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1.8 |
my ($kv) = @_; |
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use JSON::XS;#d# |
335 |
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my $kv_txt = JSON::XS->new->encode ($kv);#d# |
336 |
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$AnyEvent::MP::Kernel::WARN->(9, "$node told us it knows about $kv_txt.");#d# |
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while (my ($id, $addresses) = each %$kv) { |
339 |
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my $node = AnyEvent::MP::Kernel::add_node $id; |
340 |
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$node->connect (@$addresses); |
341 |
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start_node $id; |
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1.4 |
} |
343 |
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}, |
344 |
root |
1.16 |
find => sub { |
345 |
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1.8 |
my ($othernode) = @_; |
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$AnyEvent::MP::Kernel::WARN->(9, "$node asked us to find $othernode."); |
348 |
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1.17 |
snd $port{$node}, nodes => { $othernode => $addr{$othernode} } |
349 |
root |
1.8 |
if $addr{$othernode}; |
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}, |
351 |
root |
1.4 |
set => sub { |
352 |
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1.8 |
set_groups $node, shift; |
353 |
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1.4 |
}, |
354 |
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1.20 |
reg0 => sub { |
355 |
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_change $_[0], [], [$_[1]]; |
356 |
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}, |
357 |
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reg1 => sub { |
358 |
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_change $_[0], [$_[1]], []; |
359 |
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}, |
360 |
root |
1.26 |
|
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# some node asks us to provide network updates |
362 |
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seedme0 => sub { |
363 |
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$AnyEvent::MP::Kernel::WARN->(0, "$node asked us to NOT seed it.");#d# |
364 |
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delete $SEEDME{$node}; |
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}, |
366 |
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seedme1 => sub { |
367 |
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$AnyEvent::MP::Kernel::WARN->(0, "$node asked us to seed it.");#d# |
368 |
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$SEEDME{$node} = (); |
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# for good measure |
371 |
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snd $port{$node}, nodes => \%addr if %addr; |
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}, |
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root |
1.4 |
; |
374 |
root |
1.3 |
} |
375 |
root |
1.1 |
|
376 |
root |
1.29 |
sub set_master($) { |
377 |
|
|
return if $MASTER eq $_[0]; |
378 |
|
|
|
379 |
|
|
snd $port{$MASTER}, "seedme0" |
380 |
|
|
if $MASTER && node_is_up $MASTER; |
381 |
|
|
|
382 |
|
|
$MASTER = $_[0]; |
383 |
|
|
|
384 |
|
|
if ($MASTER) { |
385 |
|
|
snd $port{$MASTER}, "seedme1"; |
386 |
|
|
$AnyEvent::MP::Kernel::WARN->(7, "selected new master: $MASTER."); |
387 |
|
|
} else { |
388 |
|
|
$AnyEvent::MP::Kernel::WARN->(1, "no contact to any other node."); |
389 |
|
|
} |
390 |
|
|
} |
391 |
|
|
|
392 |
root |
1.1 |
sub mon_node { |
393 |
root |
1.8 |
my ($node, $is_up) = @_; |
394 |
root |
1.1 |
|
395 |
|
|
if ($is_up) { |
396 |
root |
1.8 |
++$nodecnt; |
397 |
|
|
start_node $node; |
398 |
root |
1.26 |
|
399 |
root |
1.29 |
if (node_is_seed $node) { |
400 |
|
|
if (node_is_seed $MASTER) { |
401 |
|
|
my @SEEDS = up_seeds; |
402 |
|
|
|
403 |
|
|
# switching here with lower chance roughly hopefully still gives us |
404 |
|
|
# an equal selection. |
405 |
|
|
set_master $node |
406 |
|
|
if 1 < rand @SEEDS; |
407 |
|
|
} else { |
408 |
|
|
# a seed always beats a non-seed |
409 |
|
|
set_master $node; |
410 |
|
|
} |
411 |
|
|
} |
412 |
root |
1.26 |
} |
413 |
|
|
|
414 |
root |
1.29 |
# select a new(?) master, if required |
415 |
|
|
unless ($MASTER and node_is_up $MASTER) { |
416 |
|
|
if (my @SEEDS = up_seeds) { |
417 |
|
|
set_master $SEEDS[rand @SEEDS]; |
418 |
root |
1.26 |
} else { |
419 |
root |
1.29 |
# select "last" non-seed node |
420 |
|
|
set_master +(sort +up_nodes)[-1]; |
421 |
root |
1.26 |
} |
422 |
|
|
} |
423 |
|
|
|
424 |
|
|
unless ($is_up) { |
425 |
root |
1.8 |
--$nodecnt; |
426 |
|
|
more_seeding unless $nodecnt; |
427 |
|
|
unreg_groups $node; |
428 |
|
|
|
429 |
|
|
# forget about the node |
430 |
|
|
delete $addr{$node}; |
431 |
root |
1.26 |
|
432 |
|
|
# ask our master for quick recovery |
433 |
|
|
snd $port{$MASTER}, find => $node |
434 |
|
|
if $MASTER; |
435 |
root |
1.1 |
} |
436 |
|
|
} |
437 |
|
|
|
438 |
|
|
mon_node $_, 1 |
439 |
|
|
for up_nodes; |
440 |
|
|
|
441 |
|
|
mon_nodes \&mon_node; |
442 |
|
|
|
443 |
|
|
=back |
444 |
|
|
|
445 |
|
|
=head1 SEE ALSO |
446 |
|
|
|
447 |
|
|
L<AnyEvent::MP>. |
448 |
|
|
|
449 |
|
|
=head1 AUTHOR |
450 |
|
|
|
451 |
|
|
Marc Lehmann <schmorp@schmorp.de> |
452 |
|
|
http://home.schmorp.de/ |
453 |
|
|
|
454 |
|
|
=cut |
455 |
|
|
|
456 |
|
|
1 |
457 |
|
|
|