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=head1 NAME |
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AnyEvent::MP::Global - some network-global services |
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|
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=head1 SYNOPSIS |
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|
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use AnyEvent::MP::Global; |
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|
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=head1 DESCRIPTION |
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|
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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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|
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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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|
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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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|
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=head1 GLOBALS AND FUNCTIONS |
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|
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=over 4 |
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|
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=cut |
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|
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package AnyEvent::MP::Global; |
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|
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use common::sense; |
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use Carp (); |
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use MIME::Base64 (); |
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|
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use AnyEvent (); |
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use AnyEvent::Util (); |
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|
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use AnyEvent::MP; |
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use AnyEvent::MP::Kernel; |
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|
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our $VERSION = $AnyEvent::MP::VERSION; |
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|
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our %addr; # port ID => [address...] mapping |
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|
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our %port; # our rendezvous port on the other side |
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our %lreg; # local registry, name => [pid...] |
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our %lmon; # local rgeistry monitoring name,pid => mon |
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our %greg; # global regstry, name => [pid...] |
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|
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our $nodecnt; |
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|
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$AnyEvent::MP::Kernel::WARN->(7, "starting global service."); |
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|
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############################################################################# |
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# seednodes |
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|
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our @SEEDS; |
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our %SEED_CONNECT; |
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our $SEED_WATCHER; |
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|
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sub seed_connect { |
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my ($seed) = @_; |
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|
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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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|
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# ughhh |
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$SEED_CONNECT{$seed} ||= AnyEvent::MP::Transport::mp_connect $host, $port, |
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seed => $seed, |
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sub { |
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delete $SEED_CONNECT{$seed}; |
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after 1, \&more_seeding; |
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}, |
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; |
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} |
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|
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sub more_seeding { |
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return if $nodecnt; |
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return unless @SEEDS; |
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|
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$AnyEvent::MP::Kernel::WARN->(9, "no nodes connected, seeding."); |
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|
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seed_connect $SEEDS[rand @SEEDS]; |
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} |
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|
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sub avoid_seed($) { |
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@SEEDS = grep $_ ne $_[0], @SEEDS; |
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} |
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|
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sub set_seeds(@) { |
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@SEEDS = @_; |
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|
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$SEED_WATCHER ||= AE::timer 5, $AnyEvent::MP::Kernel::MONITOR_TIMEOUT, \&more_seeding; |
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|
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seed_connect $_ |
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for @SEEDS; |
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} |
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|
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############################################################################# |
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|
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sub unreg_groups($) { |
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my ($node) = @_; |
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|
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my $qr = qr/^\Q$node\E(?:#|$)/; |
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|
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for my $group (values %greg) { |
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@$group = grep $_ !~ $qr, @$group; |
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} |
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} |
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|
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sub set_groups($$) { |
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my ($node, $lreg) = @_; |
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|
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while (my ($k, $v) = each %$lreg) { |
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push @{ $greg{$k} }, @$v; |
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} |
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} |
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|
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=item $guard = register $port, $group |
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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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|
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=cut |
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# register port from any node |
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sub _register { |
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my ($port, $group) = @_; |
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|
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push @{ $greg{$group} }, $port; |
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} |
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|
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# unregister port from any node |
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sub _unregister { |
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my ($port, $group) = @_; |
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|
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@{ $greg{$group} } = grep $_ ne $port, @{ $greg{$group} }; |
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} |
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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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|
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_unregister $port, $group; |
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|
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snd $_, reg0 => $port, $group |
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for values %port; |
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} |
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|
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# register local port |
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sub register($$) { |
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my ($port, $group) = @_; |
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port_is_local $port |
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or Carp::croak "AnyEvent::MP::Global::register can only be called for local ports, caught"; |
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$lmon{"$group\x00$port"} = mon $port, sub { unregister $port, $group }; |
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push @{ $lreg{$group} }, $port; |
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|
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snd $_, reg1 => $port, $group |
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for values %port; |
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|
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_register $port, $group; |
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|
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wantarray && AnyEvent::Util::guard { unregister $port, $group } |
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} |
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|
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=item $ports = find $group |
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Returns all the ports currently registered to the given group (as |
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read-only array reference). When the group has no registered members, |
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return C<undef>. |
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|
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=cut |
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|
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sub find($) { |
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@{ $greg{$_[0]} } |
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? $greg{$_[0]} |
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: undef |
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} |
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|
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sub start_node { |
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my ($node) = @_; |
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return if exists $port{$node}; |
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return if $node eq $NODE; # do not connect to ourselves |
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|
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# establish connection |
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my $port = $port{$node} = spawn $node, "AnyEvent::MP::Global::connect", 0, $NODE; |
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mon $port, sub { |
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unreg_groups $node; |
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delete $port{$node}; |
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}; |
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snd $port, addr => $AnyEvent::MP::Kernel::LISTENER; |
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snd $port, connect => \%addr if %addr; |
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snd $port, set => \%lreg if %lreg; |
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} |
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# other nodes connect via this |
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sub connect { |
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my ($version, $node) = @_; |
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# monitor them, silently die |
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mon $node, psub { kil $SELF }; |
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rcv $SELF, |
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addr => sub { |
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my $addresses = shift; |
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$AnyEvent::MP::Kernel::WARN->(9, "$node told us its addresses (@$addresses)."); |
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$addr{$node} = $addresses; |
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# to help listener-less nodes, we broadcast new addresses to them unconditionally |
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#TODO: should be done by a node finding out about a listener-less one |
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if (@$addresses) { |
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for my $other (values %AnyEvent::MP::NODE) { |
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if ($other->{transport}) { |
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if ($addr{$other->{id}} && !@{ $addr{$other->{id}} }) { |
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$AnyEvent::MP::Kernel::WARN->(9, "helping $other->{id} to find $node."); |
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snd $port{$other->{id}}, connect => { $node => $addresses }; |
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} |
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} |
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} |
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} |
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}, |
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connect => sub { |
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my ($kv) = @_; |
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|
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use JSON::XS;#d# |
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my $kv_txt = JSON::XS->new->encode ($kv);#d# |
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$AnyEvent::MP::Kernel::WARN->(9, "$node told us it knows about $kv_txt.");#d# |
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|
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while (my ($id, $addresses) = each %$kv) { |
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my $node = AnyEvent::MP::Kernel::add_node $id; |
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$node->connect (@$addresses); |
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start_node $id; |
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} |
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}, |
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find => sub { |
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my ($othernode) = @_; |
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$AnyEvent::MP::Kernel::WARN->(9, "$node asked us to find $othernode."); |
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snd $port{$node}, connect => { $othernode => $addr{$othernode} } |
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if $addr{$othernode}; |
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}, |
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set => sub { |
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set_groups $node, shift; |
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}, |
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reg1 => \&_register, |
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reg0 => \&_unregister, |
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; |
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} |
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|
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sub mon_node { |
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my ($node, $is_up) = @_; |
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|
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if ($is_up) { |
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++$nodecnt; |
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start_node $node; |
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} else { |
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--$nodecnt; |
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more_seeding unless $nodecnt; |
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unreg_groups $node; |
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|
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# forget about the node |
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delete $addr{$node}; |
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# ask other nodes if they know the node |
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snd $_, find => $node |
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for values %port; |
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} |
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#warn "node<$node,$is_up>\n";#d# |
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} |
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|
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mon_node $_, 1 |
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for up_nodes; |
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|
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mon_nodes \&mon_node; |
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|
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=back |
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|
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=head1 SEE ALSO |
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|
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L<AnyEvent::MP>. |
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|
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=head1 AUTHOR |
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|
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Marc Lehmann <schmorp@schmorp.de> |
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http://home.schmorp.de/ |
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|
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=cut |
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1 |
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