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=head1 NAME |
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|
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AnyEvent::MP - multi-processing/message-passing framework |
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|
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=head1 SYNOPSIS |
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|
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use AnyEvent::MP; |
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|
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NODE # returns this node identifier |
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$NODE # contains this node identifier |
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|
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snd $port, type => data...; |
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|
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rcv $port, smartmatch => $cb->($port, @msg); |
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|
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# examples: |
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rcv $port2, ping => sub { snd $_[0], "pong"; 0 }; |
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rcv $port1, pong => sub { warn "pong received\n" }; |
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snd $port2, ping => $port1; |
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|
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# more, smarter, matches (_any_ is exported by this module) |
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rcv $port, [child_died => $pid] => sub { ... |
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rcv $port, [_any_, _any_, 3] => sub { .. $_[2] is 3 |
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|
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=head1 DESCRIPTION |
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|
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This module (-family) implements a simple message passing framework. |
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|
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Despite its simplicity, you can securely message other processes running |
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on the same or other hosts. |
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|
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=head1 CONCEPTS |
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|
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=over 4 |
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|
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=item port |
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|
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A port is something you can send messages to with the C<snd> function, and |
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you can register C<rcv> handlers with. All C<rcv> handlers will receive |
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messages they match, messages will not be queued. |
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|
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=item port id - C<pid@host#portname> |
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|
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A port id is always the node id, a hash-mark (C<#>) as separator, followed |
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by a port name. |
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|
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A port name can be a well known port (basically an identifier/bareword), |
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or a generated name, consisting of node id, a dot (C<.>), and an |
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identifier. |
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|
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=item node |
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|
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A node is a single process containing at least one port - the node |
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port. You can send messages to node ports to let them create new ports, |
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among other things. |
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|
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Initially, nodes are either private (single-process only) or hidden |
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(connected to a father node only). Only when they epxlicitly "go public" |
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can you send them messages form unrelated other nodes. |
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|
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Public nodes automatically connect to all other public nodes in a network |
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when they connect, creating a full mesh. |
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|
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=item node id - C<host:port>, C<id@host>, C<id> |
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|
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A node ID is a string that either uniquely identifies a given node (For |
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private and hidden nodes), or contains a recipe on how to reach a given |
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node (for public nodes). |
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|
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=back |
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|
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=head1 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; |
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|
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use AnyEvent::MP::Util (); |
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use AnyEvent::MP::Node; |
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use AnyEvent::MP::Transport; |
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|
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use utf8; |
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use common::sense; |
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|
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use Carp (); |
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|
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use AE (); |
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|
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use base "Exporter"; |
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|
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our $VERSION = '0.0'; |
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our @EXPORT = qw(NODE $NODE $PORT snd rcv _any_); |
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|
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our $DEFAULT_SECRET; |
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our $DEFAULT_PORT = "4040"; |
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|
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our $CONNECT_INTERVAL = 5; # new connect every 5s, at least |
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our $CONNECT_TIMEOUT = 30; # includes handshake |
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|
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sub default_secret { |
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unless (defined $DEFAULT_SECRET) { |
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if (open my $fh, "<$ENV{HOME}/.aemp-secret") { |
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sysread $fh, $DEFAULT_SECRET, -s $fh; |
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} else { |
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$DEFAULT_SECRET = AnyEvent::MP::Util::nonce 32; |
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} |
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} |
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|
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$DEFAULT_SECRET |
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} |
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|
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our $UNIQ = sprintf "%x.%x", $$, time; # per-process/node unique cookie |
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our $PUBLIC = 0; |
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our $NODE; |
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our $PORT; |
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|
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our %NODE; # node id to transport mapping, or "undef", for local node |
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our %PORT; # local ports |
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our %LISTENER; # local transports |
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|
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sub NODE() { $NODE } |
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|
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{ |
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use POSIX (); |
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my $nodename = (POSIX::uname)[1]; |
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$NODE = "$$\@$nodename"; |
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} |
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|
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sub _ANY_() { 1 } |
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sub _any_() { \&_ANY_ } |
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|
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sub add_node { |
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my ($noderef) = @_; |
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|
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return $NODE{$noderef} |
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if exists $NODE{$noderef}; |
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|
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for (split /,/, $noderef) { |
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return $NODE{$noderef} = $NODE{$_} |
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if exists $NODE{$_}; |
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} |
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|
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# for indirect sends, use a different class |
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my $node = new AnyEvent::MP::Node::Direct $noderef; |
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|
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$NODE{$_} = $node |
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for $noderef, split /,/, $noderef; |
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|
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$node |
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} |
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|
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sub snd($@) { |
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my ($noderef, $port) = split /#/, shift, 2; |
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|
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add_node $noderef |
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unless exists $NODE{$noderef}; |
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|
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$NODE{$noderef}->send ([$port, [@_]]); |
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} |
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|
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sub _inject { |
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my ($port, $msg) = @{+shift}; |
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|
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$port = $PORT{$port} |
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or return; |
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|
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use Data::Dumper; |
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warn Dumper $msg; |
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} |
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|
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sub normalise_noderef($) { |
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my ($noderef) = @_; |
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|
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my $cv = AE::cv; |
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my @res; |
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|
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$cv->begin (sub { |
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my %seen; |
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my @refs; |
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for (sort { $a->[0] <=> $b->[0] } @res) { |
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push @refs, $_->[1] unless $seen{$_->[1]}++ |
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} |
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shift->send (join ",", @refs); |
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}); |
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|
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$noderef = $DEFAULT_PORT unless length $noderef; |
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|
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my $idx; |
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for my $t (split /,/, $noderef) { |
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my $pri = ++$idx; |
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|
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#TODO: this should be outside normalise_noderef and in become_public |
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if ($t =~ /^\d*$/) { |
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my $nodename = (POSIX::uname)[1]; |
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|
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$cv->begin; |
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AnyEvent::Socket::resolve_sockaddr $nodename, $t || "aemp=$DEFAULT_PORT", "tcp", 0, undef, sub { |
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for (@_) { |
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my ($service, $host) = AnyEvent::Socket::unpack_sockaddr $_->[3]; |
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push @res, [ |
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$pri += 1e-5, |
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AnyEvent::Socket::format_hostport AnyEvent::Socket::format_address $host, $service |
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]; |
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} |
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$cv->end; |
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}; |
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|
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# my (undef, undef, undef, undef, @ipv4) = gethostbyname $nodename; |
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# |
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# for (@ipv4) { |
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# push @res, [ |
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# $pri, |
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# AnyEvent::Socket::format_hostport AnyEvent::Socket::format_address $_, $t || $DEFAULT_PORT, |
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# ]; |
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# } |
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} else { |
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my ($host, $port) = AnyEvent::Socket::parse_hostport $t, "aemp=$DEFAULT_PORT" |
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or Carp::croak "$t: unparsable transport descriptor"; |
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|
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$cv->begin; |
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AnyEvent::Socket::resolve_sockaddr $host, $port, "tcp", 0, undef, sub { |
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for (@_) { |
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my ($service, $host) = AnyEvent::Socket::unpack_sockaddr $_->[3]; |
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push @res, [ |
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$pri += 1e-5, |
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AnyEvent::Socket::format_hostport AnyEvent::Socket::format_address $host, $service |
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]; |
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} |
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$cv->end; |
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} |
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} |
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} |
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|
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$cv->end; |
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|
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$cv |
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} |
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|
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sub become_public { |
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return if $PUBLIC; |
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|
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my $noderef = join ",", ref $_[0] ? @{+shift} : shift; |
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my @args = @_; |
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|
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$NODE = (normalise_noderef $noderef)->recv; |
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|
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my $self = new AnyEvent::MP::Node::Self noderef => $NODE; |
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|
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$NODE{""} = $self; # empty string == local node |
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|
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for my $t (split /,/, $NODE) { |
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$NODE{$t} = $self; |
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|
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my ($host, $port) = AnyEvent::Socket::parse_hostport $t; |
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|
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$LISTENER{$t} = AnyEvent::MP::Transport::mp_server $host, $port, |
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@args, |
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on_error => sub { |
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die "on_error<@_>\n";#d# |
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}, |
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on_connect => sub { |
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my ($tp) = @_; |
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|
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$NODE{$tp->{remote_id}} = $_[0]; |
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}, |
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sub { |
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my ($tp) = @_; |
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|
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$NODE{"$tp->{peerhost}:$tp->{peerport}"} = $tp; |
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}, |
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; |
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} |
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$PUBLIC = 1; |
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} |
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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>. |
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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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|
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