| 1 |
=head1 NAME |
| 2 |
|
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AnyEvent::MP::Kernel - the actual message passing kernel |
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|
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=head1 SYNOPSIS |
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|
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use AnyEvent::MP::Kernel; |
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|
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=head1 DESCRIPTION |
| 10 |
|
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This module provides most of the basic functionality of AnyEvent::MP, |
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exposed through higher level interfaces such as L<AnyEvent::MP> and |
| 13 |
L<Coro::MP>. |
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|
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This module is mainly of interest when knowledge about connectivity, |
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connected nodes etc. are needed. |
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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::Kernel; |
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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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|
| 30 |
use AE (); |
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|
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use AnyEvent::MP::Node; |
| 33 |
use AnyEvent::MP::Transport; |
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|
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use base "Exporter"; |
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|
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our $VERSION = '0.6'; |
| 38 |
our @EXPORT = qw( |
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%NODE %PORT %PORT_DATA $UNIQ $RUNIQ $ID add_node load_func |
| 40 |
|
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NODE $NODE node_of snd kil |
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resolve_node initialise_node |
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); |
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|
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our $DEFAULT_PORT = "4040"; |
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|
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our $CONNECT_INTERVAL = 2; # new connect every 2s, at least |
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our $NETWORK_LATENCY = 3; # activity timeout |
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our $MONITOR_TIMEOUT = 15; # fail monitoring after this time |
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|
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=item $AnyEvent::MP::Kernel::WARN |
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|
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This value is called with an error or warning message, when e.g. a connection |
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could not be created, authorisation failed and so on. |
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|
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The default simply logs the message to STDERR. |
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|
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=cut |
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|
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our $WARN = sub { |
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my $msg = $_[0]; |
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$msg =~ s/\n$//; |
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warn "$msg\n"; |
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}; |
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|
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sub load_func($) { |
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my $func = $_[0]; |
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|
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unless (defined &$func) { |
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my $pkg = $func; |
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do { |
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$pkg =~ s/::[^:]+$// |
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or return sub { die "unable to resolve '$func'" }; |
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eval "require $pkg"; |
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} until defined &$func; |
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} |
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|
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\&$func |
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} |
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|
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sub nonce($) { |
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my $nonce; |
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|
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if (open my $fh, "</dev/urandom") { |
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sysread $fh, $nonce, $_[0]; |
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} else { |
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# shit... |
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our $nonce_init; |
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unless ($nonce_init++) { |
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srand time ^ $$ ^ unpack "%L*", qx"ps -edalf" . qx"ipconfig /all"; |
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} |
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|
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$nonce = join "", map +(chr rand 256), 1 .. $_[0] |
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} |
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|
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$nonce |
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} |
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|
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sub asciibits($) { |
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my $data = $_[0]; |
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|
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if (eval "use Math::GMP 2.05; 1") { |
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$data = Math::GMP::get_str_gmp ( |
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(Math::GMP::new_from_scalar_with_base (+(unpack "H*", $data), 16)), |
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62 |
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); |
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} else { |
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$data = MIME::Base64::encode_base64 $data, ""; |
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$data =~ s/=//; |
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$data =~ s/\//s/g; |
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$data =~ s/\+/p/g; |
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} |
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|
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$data |
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} |
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|
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sub gen_uniq { |
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asciibits pack "wNa*", $$, time, nonce 2 |
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} |
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|
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=item $AnyEvent::MP::Kernel::PUBLIC |
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|
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A boolean indicating whether this is a full/public node, which can create |
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and accept direct connections form othe rnodes. |
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|
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=item $AnyEvent::MP::Kernel::SLAVE |
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|
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A boolean indicating whether this node is a slave node, i.e. does most of it's |
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message sending/receiving through some master node. |
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|
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=item $AnyEvent::MP::Kernel::MASTER |
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|
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Defined only in slave mode, in which cas eit contains the noderef of the |
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master node. |
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|
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=cut |
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|
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our $PUBLIC = 0; |
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our $SLAVE = 0; |
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our $MASTER; # master noderef when $SLAVE |
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|
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our $NODE = asciibits nonce 16; |
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our $RUNIQ = $NODE; # remote uniq value |
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our $UNIQ = gen_uniq; # per-process/node unique cookie |
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our $ID = "a"; |
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|
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our %NODE; # node id to transport mapping, or "undef", for local node |
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our (%PORT, %PORT_DATA); # local ports |
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|
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our %RMON; # local ports monitored by remote nodes ($RMON{noderef}{portid} == cb) |
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our %LMON; # monitored _local_ ports |
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|
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our %LISTENER; |
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|
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our $SRCNODE; # holds the sending node during _inject |
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|
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sub NODE() { |
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$NODE |
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} |
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|
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sub node_of($) { |
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my ($noderef, undef) = split /#/, $_[0], 2; |
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|
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$noderef |
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} |
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|
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sub TRACE() { 0 } |
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|
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sub _inject { |
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warn "RCV $SRCNODE->{noderef} -> @_\n" if TRACE;#d# |
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&{ $PORT{+shift} or return }; |
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} |
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|
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sub add_node { |
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my ($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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# new node, check validity |
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my $node; |
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|
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if ($noderef =~ /^slave\/.+$/) { |
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$node = new AnyEvent::MP::Node::Indirect $noderef; |
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|
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} else { |
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for (split /,/, $noderef) { |
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my ($host, $port) = AnyEvent::Socket::parse_hostport $_ |
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or Carp::croak "$noderef: not a resolved node reference ('$_' not parsable)"; |
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|
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$port > 0 |
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or Carp::croak "$noderef: not a resolved node reference ('$_' contains non-numeric port)"; |
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|
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AnyEvent::Socket::parse_address $host |
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or Carp::croak "$noderef: not a resolved node reference ('$_' contains unresolved address)"; |
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} |
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|
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# TODO: for indirect sends, use a different class |
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$node = new AnyEvent::MP::Node::Direct $noderef; |
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} |
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|
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$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, $portid) = split /#/, shift, 2; |
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|
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warn "SND $noderef <- $portid @_\n" if TRACE;#d# |
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|
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($NODE{$noderef} || add_node $noderef) |
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->{send} (["$portid", @_]); |
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} |
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|
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sub kil(@) { |
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my ($noderef, $portid) = split /#/, shift, 2; |
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|
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length $portid |
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or Carp::croak "$noderef#$portid: killing a node port is not allowed, caught"; |
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|
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($NODE{$noderef} || add_node $noderef) |
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->kill ("$portid", @_); |
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} |
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|
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sub _nodename { |
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require POSIX; |
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(POSIX::uname ())[1] |
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} |
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|
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sub resolve_node($) { |
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my ($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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$t = length $t ? _nodename . ":$t" : _nodename |
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if $t =~ /^\d*$/; |
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|
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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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$cv->end; |
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|
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$cv |
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} |
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|
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sub initialise_node(@) { |
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my ($noderef, @others) = @_; |
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|
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my $profile = AnyEvent::MP::Config::find_profile |
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+(defined $noderef ? $noderef : _nodename); |
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|
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$noderef = $profile->{noderef} |
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if exists $profile->{noderef}; |
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|
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push @others, @{ $profile->{seeds} }; |
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|
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if ($noderef =~ /^slave\/(.*)$/) { |
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$SLAVE = AE::cv; |
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my $name = $1; |
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$name = $NODE unless length $name; |
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$noderef = AE::cv; |
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$noderef->send ("slave/$name"); |
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|
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@others |
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or Carp::croak "seed nodes must be specified for slave nodes"; |
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|
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} else { |
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$PUBLIC = 1; |
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$noderef = resolve_node $noderef; |
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} |
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|
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@others = map $_->recv, map +(resolve_node $_), @others; |
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|
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$NODE = $noderef->recv; |
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|
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for my $t (split /,/, $NODE) { |
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$NODE{$t} = $NODE{""}; |
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|
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my ($host, $port) = AnyEvent::Socket::parse_hostport $t; |
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|
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$LISTENER{$t} = AnyEvent::MP::Transport::mp_server $host, $port, |
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sub { |
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my ($tp) = @_; |
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|
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# TODO: urgs |
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my $node = add_node $tp->{remote_node}; |
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$node->{trial}{accept} = $tp; |
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}, |
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; |
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} |
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|
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(add_node $_)->connect for @others; |
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|
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if ($SLAVE) { |
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my $timeout = AE::timer $MONITOR_TIMEOUT, 0, sub { $SLAVE->() }; |
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$MASTER = $SLAVE->recv; |
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defined $MASTER |
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or Carp::croak "AnyEvent::MP: unable to enter slave mode, unable to connect to a seednode.\n"; |
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|
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(my $via = $MASTER) =~ s/,/!/g; |
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|
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$NODE .= "\@$via"; |
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$NODE{$NODE} = $NODE{""}; |
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|
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$_->send (["", iam => $NODE]) |
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for values %NODE; |
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|
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$SLAVE = 1; |
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} |
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|
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(load_func $_)->() |
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for @{ $profile->{services} }; |
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} |
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|
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############################################################################# |
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# node monitoring and info |
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|
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sub _uniq_nodes { |
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my %node; |
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|
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@node{values %NODE} = values %NODE; |
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|
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values %node; |
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} |
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|
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=item known_nodes |
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|
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Returns the noderefs of all nodes connected to this node. |
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|
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=cut |
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|
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sub known_nodes { |
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map $_->{noderef}, _uniq_nodes |
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} |
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|
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=item up_nodes |
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|
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Return the noderefs of all nodes that are currently connected (excluding |
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the node itself). |
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|
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=cut |
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|
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sub up_nodes { |
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map $_->{noderef}, grep $_->{transport}, _uniq_nodes |
| 381 |
} |
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|
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=item $guard = mon_nodes $callback->($noderef, $is_up, @reason) |
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|
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Registers a callback that is called each time a node goes up (connection |
| 386 |
is established) or down (connection is lost). |
| 387 |
|
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Node up messages can only be followed by node down messages for the same |
| 389 |
node, and vice versa. |
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|
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The fucntino returns an optional guard which can be used to de-register |
| 392 |
the monitoring callback again. |
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|
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=cut |
| 395 |
|
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our %MON_NODES; |
| 397 |
|
| 398 |
sub mon_nodes($) { |
| 399 |
my ($cb) = @_; |
| 400 |
|
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$MON_NODES{$cb+0} = $cb; |
| 402 |
|
| 403 |
wantarray && AnyEvent::Util::guard { delete $MON_NODES{$cb+0} } |
| 404 |
} |
| 405 |
|
| 406 |
sub _inject_nodeevent($$;@) { |
| 407 |
my ($node, @args) = @_; |
| 408 |
|
| 409 |
unshift @args, $node->{noderef}; |
| 410 |
|
| 411 |
for my $cb (values %MON_NODES) { |
| 412 |
eval { $cb->(@args); 1 } |
| 413 |
or $WARN->($@); |
| 414 |
} |
| 415 |
} |
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|
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############################################################################# |
| 418 |
# self node code |
| 419 |
|
| 420 |
our %node_req = ( |
| 421 |
# internal services |
| 422 |
|
| 423 |
# monitoring |
| 424 |
mon0 => sub { # disable monitoring |
| 425 |
my $portid = shift; |
| 426 |
my $node = $SRCNODE; |
| 427 |
$NODE{""}->unmonitor ($portid, delete $node->{rmon}{$portid}); |
| 428 |
}, |
| 429 |
mon1 => sub { # enable monitoring |
| 430 |
my $portid = shift; |
| 431 |
my $node = $SRCNODE; |
| 432 |
$NODE{""}->monitor ($portid, $node->{rmon}{$portid} = sub { |
| 433 |
$node->send (["", kil => $portid, @_]); |
| 434 |
}); |
| 435 |
}, |
| 436 |
kil => sub { |
| 437 |
my $cbs = delete $SRCNODE->{lmon}{+shift} |
| 438 |
or return; |
| 439 |
|
| 440 |
$_->(@_) for @$cbs; |
| 441 |
}, |
| 442 |
# node changed its name (for slave nodes) |
| 443 |
iam => sub { |
| 444 |
# get rid of bogus slave/xxx name, hopefully |
| 445 |
delete $NODE{$SRCNODE->{noderef}}; |
| 446 |
|
| 447 |
# change noderef |
| 448 |
$SRCNODE->{noderef} = $_[0]; |
| 449 |
|
| 450 |
# anchor |
| 451 |
$NODE{$_[0]} = $SRCNODE; |
| 452 |
}, |
| 453 |
|
| 454 |
# public services |
| 455 |
|
| 456 |
# relay message to another node / generic echo |
| 457 |
relay => sub { |
| 458 |
&snd; |
| 459 |
}, |
| 460 |
relay_multiple => sub { |
| 461 |
snd @$_ for @_ |
| 462 |
}, |
| 463 |
|
| 464 |
# informational |
| 465 |
info => sub { |
| 466 |
snd @_, $NODE; |
| 467 |
}, |
| 468 |
known_nodes => sub { |
| 469 |
snd @_, known_nodes; |
| 470 |
}, |
| 471 |
up_nodes => sub { |
| 472 |
snd @_, up_nodes; |
| 473 |
}, |
| 474 |
|
| 475 |
# random garbage |
| 476 |
eval => sub { |
| 477 |
my @res = eval shift; |
| 478 |
snd @_, "$@", @res if @_; |
| 479 |
}, |
| 480 |
time => sub { |
| 481 |
snd @_, AE::time; |
| 482 |
}, |
| 483 |
devnull => sub { |
| 484 |
# |
| 485 |
}, |
| 486 |
); |
| 487 |
|
| 488 |
$NODE{""} = $NODE{$NODE} = new AnyEvent::MP::Node::Self noderef => $NODE; |
| 489 |
$PORT{""} = sub { |
| 490 |
my $tag = shift; |
| 491 |
eval { &{ $node_req{$tag} ||= load_func $tag } }; |
| 492 |
$WARN->("error processing node message: $@") if $@; |
| 493 |
}; |
| 494 |
|
| 495 |
=back |
| 496 |
|
| 497 |
=head1 SEE ALSO |
| 498 |
|
| 499 |
L<AnyEvent::MP>. |
| 500 |
|
| 501 |
=head1 AUTHOR |
| 502 |
|
| 503 |
Marc Lehmann <schmorp@schmorp.de> |
| 504 |
http://home.schmorp.de/ |
| 505 |
|
| 506 |
=cut |
| 507 |
|
| 508 |
1 |
| 509 |
|
