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1.1 |
=head1 NAME |
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1.3 |
AnyEvent::MP::Kernel - the actual message passing kernel |
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1.1 |
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=head1 SYNOPSIS |
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1.3 |
use AnyEvent::MP::Kernel; |
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1.1 |
|
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=head1 DESCRIPTION |
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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 |
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L<Coro::MP>. |
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1.3 |
This module is mainly of interest when knowledge about connectivity, |
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1.27 |
connected nodes etc. is sought. |
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=head1 GLOBALS AND FUNCTIONS |
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=over 4 |
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=cut |
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package AnyEvent::MP::Kernel; |
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use common::sense; |
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1.16 |
use POSIX (); |
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1.1 |
use Carp (); |
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use MIME::Base64 (); |
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use AE (); |
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use AnyEvent::MP::Node; |
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use AnyEvent::MP::Transport; |
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use base "Exporter"; |
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1.28 |
our $VERSION = '0.9'; |
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1.1 |
our @EXPORT = qw( |
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1.13 |
%NODE %PORT %PORT_DATA $UNIQ $RUNIQ $ID |
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1.21 |
add_node load_func snd_to_func snd_on eval_on |
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1.1 |
|
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1.10 |
NODE $NODE node_of snd kil |
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1.17 |
port_is_local |
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1.1 |
resolve_node initialise_node |
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1.13 |
known_nodes up_nodes mon_nodes node_is_known node_is_up |
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1.1 |
); |
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our $DEFAULT_PORT = "4040"; |
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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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1.16 |
=item $AnyEvent::MP::Kernel::WARN->($level, $msg) |
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1.1 |
|
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1.27 |
This value is called with an error or warning message, when e.g. a |
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connection could not be created, authorisation failed and so on. |
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It I<must not> block or send messages -queue it and use an idle watcher if |
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you need to do any of these things. |
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1.1 |
|
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1.16 |
C<$level> sould be C<0> for messages ot be logged always, C<1> for |
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unexpected messages and errors, C<2> for warnings, C<7> for messages about |
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node connectivity and services, C<8> for debugging messages and C<9> for |
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tracing messages. |
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The default simply logs the message to STDERR. |
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=cut |
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our $WARNLEVEL = exists $ENV{PERL_ANYEVENT_MP_WARNLEVEL} ? $ENV{PERL_ANYEVENT_MP_WARNLEVEL} : 5; |
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1.1 |
our $WARN = sub { |
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1.29 |
return if $WARNLEVEL < $_[0]; |
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1.16 |
my ($level, $msg) = @_; |
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$msg =~ s/\n$//; |
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printf STDERR "%s <%d> %s\n", |
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(POSIX::strftime "%Y-%m-%d %H:%M:%S", localtime time), |
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$level, |
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$msg; |
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}; |
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1.29 |
=item $AnyEvent::MP::Kernel::WARNLEVEL [default 5 or $ENV{PERL_ANYEVENT_MP_WARNLEVEL}] |
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The maximum level at which warning messages will be printed to STDERR by |
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the default warn handler. |
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=cut |
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sub load_func($) { |
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my $func = $_[0]; |
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unless (defined &$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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\&$func |
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} |
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sub nonce($) { |
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my $nonce; |
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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 $nonce_init; |
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1.31 |
unless ($nonce_init++) { |
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srand time ^ $$ ^ unpack "%L*", qx"ps -edalf" . qx"ipconfig /all"; |
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} |
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$nonce = join "", map +(chr rand 256), 1 .. $_[0] |
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} |
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$nonce |
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} |
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1.21 |
sub alnumbits($) { |
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my $data = $_[0]; |
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if (eval "use Math::GMP 2.05; 1") { |
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$data = Math::GMP::get_str_gmp ( |
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(Math::GMP::new_from_scalar_with_base (+(unpack "H*", $data), 16)), |
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); |
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} else { |
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$data = MIME::Base64::encode_base64 $data, ""; |
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$data =~ s/=//; |
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$data =~ s/x/x0/g; |
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$data =~ s/\//x1/g; |
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$data =~ s/\+/x2/g; |
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} |
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$data |
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} |
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sub gen_uniq { |
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alnumbits pack "wNa*", $$, time, nonce 2 |
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1.1 |
} |
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1.20 |
our $CONFIG; # this node's configuration |
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our $RUNIQ = alnumbits nonce 16;; # remote uniq value |
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our $UNIQ = gen_uniq; # per-process/node unique cookie |
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1.21 |
our $NODE = "anon/$RUNIQ"; |
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1.1 |
our $ID = "a"; |
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our %NODE; # node id to transport mapping, or "undef", for local node |
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our (%PORT, %PORT_DATA); # local ports |
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1.21 |
our %RMON; # local ports monitored by remote nodes ($RMON{nodeid}{portid} == cb) |
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1.1 |
our %LMON; # monitored _local_ ports |
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our %LISTENER; |
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1.21 |
our $LISTENER; # our listeners, as arrayref |
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1.1 |
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our $SRCNODE; # holds the sending node during _inject |
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sub NODE() { |
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$NODE |
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} |
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sub node_of($) { |
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1.21 |
my ($node, undef) = split /#/, $_[0], 2; |
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1.1 |
|
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1.21 |
$node |
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1.1 |
} |
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1.17 |
BEGIN { |
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*TRACE = $ENV{PERL_ANYEVENT_MP_TRACE} |
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? sub () { 1 } |
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: sub () { 0 }; |
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} |
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sub _inject { |
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1.25 |
warn "RCV $SRCNODE->{id} -> " . (JSON::XS->new->encode (\@_)) . "\n" if TRACE && @_;#d# |
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1.1 |
&{ $PORT{+shift} or return }; |
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} |
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1.20 |
# this function adds a node-ref, so you can send stuff to it |
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# it is basically the central routing component. |
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1.1 |
sub add_node { |
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1.21 |
my ($node) = @_; |
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1.1 |
|
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1.21 |
$NODE{$node} ||= new AnyEvent::MP::Node::Direct $node |
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1.13 |
} |
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1.1 |
sub snd(@) { |
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1.21 |
my ($nodeid, $portid) = split /#/, shift, 2; |
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1.1 |
|
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1.25 |
warn "SND $nodeid <- " . (JSON::XS->new->encode (\@_)) . "\n" if TRACE && @_;#d# |
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1.1 |
|
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1.21 |
($NODE{$nodeid} || add_node $nodeid) |
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1.2 |
->{send} (["$portid", @_]); |
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1.1 |
} |
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1.17 |
=item $is_local = port_is_local $port |
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Returns true iff the port is a local port. |
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=cut |
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sub port_is_local($) { |
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1.21 |
my ($nodeid, undef) = split /#/, $_[0], 2; |
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1.17 |
|
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1.21 |
$NODE{$nodeid} == $NODE{""} |
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1.17 |
} |
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1.18 |
=item snd_to_func $node, $func, @args |
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1.11 |
|
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1.21 |
Expects a node ID and a name of a function. Asynchronously tries to call |
220 |
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1.11 |
this function with the given arguments on that node. |
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1.20 |
This function can be used to implement C<spawn>-like interfaces. |
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1.11 |
|
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=cut |
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1.18 |
sub snd_to_func($$;@) { |
227 |
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1.21 |
my $nodeid = shift; |
228 |
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1.11 |
|
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1.21 |
($NODE{$nodeid} || add_node $nodeid) |
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1.11 |
->send (["", @_]); |
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} |
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1.18 |
=item snd_on $node, @msg |
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Executes C<snd> with the given C<@msg> (which must include the destination |
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port) on the given node. |
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=cut |
239 |
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240 |
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sub snd_on($@) { |
241 |
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my $node = shift; |
242 |
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snd $node, snd => @_; |
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} |
244 |
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1.29 |
=item eval_on $node, $string[, @reply] |
246 |
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1.18 |
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247 |
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1.29 |
Evaluates the given string as Perl expression on the given node. When |
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@reply is specified, then it is used to construct a reply message with |
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C<"$@"> and any results from the eval appended. |
250 |
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1.18 |
|
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=cut |
252 |
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253 |
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1.29 |
sub eval_on($$;@) { |
254 |
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1.18 |
my $node = shift; |
255 |
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snd $node, eval => @_; |
256 |
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} |
257 |
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258 |
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1.1 |
sub kil(@) { |
259 |
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1.21 |
my ($nodeid, $portid) = split /#/, shift, 2; |
260 |
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1.1 |
|
261 |
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length $portid |
262 |
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1.21 |
or Carp::croak "$nodeid#$portid: killing a node port is not allowed, caught"; |
263 |
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1.1 |
|
264 |
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1.21 |
($NODE{$nodeid} || add_node $nodeid) |
265 |
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1.1 |
->kill ("$portid", @_); |
266 |
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} |
267 |
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268 |
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1.7 |
sub _nodename { |
269 |
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require POSIX; |
270 |
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(POSIX::uname ())[1] |
271 |
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} |
272 |
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273 |
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1.21 |
sub _resolve($) { |
274 |
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my ($nodeid) = @_; |
275 |
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1.1 |
|
276 |
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my $cv = AE::cv; |
277 |
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my @res; |
278 |
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279 |
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$cv->begin (sub { |
280 |
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my %seen; |
281 |
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my @refs; |
282 |
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for (sort { $a->[0] <=> $b->[0] } @res) { |
283 |
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push @refs, $_->[1] unless $seen{$_->[1]}++ |
284 |
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} |
285 |
root |
1.21 |
shift->send (@refs); |
286 |
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1.1 |
}); |
287 |
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288 |
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1.21 |
$nodeid = $DEFAULT_PORT unless length $nodeid; |
289 |
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1.1 |
|
290 |
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my $idx; |
291 |
root |
1.21 |
for my $t (split /,/, $nodeid) { |
292 |
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1.1 |
my $pri = ++$idx; |
293 |
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1.7 |
|
294 |
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$t = length $t ? _nodename . ":$t" : _nodename |
295 |
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if $t =~ /^\d*$/; |
296 |
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1.1 |
|
297 |
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1.7 |
my ($host, $port) = AnyEvent::Socket::parse_hostport $t, "aemp=$DEFAULT_PORT" |
298 |
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or Carp::croak "$t: unparsable transport descriptor"; |
299 |
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300 |
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$cv->begin; |
301 |
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AnyEvent::Socket::resolve_sockaddr $host, $port, "tcp", 0, undef, sub { |
302 |
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for (@_) { |
303 |
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my ($service, $host) = AnyEvent::Socket::unpack_sockaddr $_->[3]; |
304 |
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push @res, [ |
305 |
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$pri += 1e-5, |
306 |
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AnyEvent::Socket::format_hostport AnyEvent::Socket::format_address $host, $service |
307 |
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]; |
308 |
root |
1.1 |
} |
309 |
root |
1.7 |
$cv->end; |
310 |
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}; |
311 |
root |
1.1 |
} |
312 |
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313 |
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$cv->end; |
314 |
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315 |
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$cv |
316 |
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} |
317 |
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318 |
root |
1.22 |
sub initialise_node(;$%) { |
319 |
root |
1.21 |
my ($profile) = @_; |
320 |
root |
1.1 |
|
321 |
root |
1.21 |
$profile = _nodename |
322 |
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unless defined $profile; |
323 |
root |
1.6 |
|
324 |
root |
1.21 |
$CONFIG = AnyEvent::MP::Config::find_profile $profile; |
325 |
root |
1.24 |
|
326 |
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my $node = exists $CONFIG->{nodeid} ? $CONFIG->{nodeid} : $profile; |
327 |
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$NODE = $node |
328 |
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unless $node eq "anon/"; |
329 |
root |
1.6 |
|
330 |
root |
1.21 |
$NODE{$NODE} = $NODE{""}; |
331 |
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$NODE{$NODE}{id} = $NODE; |
332 |
root |
1.20 |
|
333 |
root |
1.21 |
my $seeds = $CONFIG->{seeds}; |
334 |
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my $binds = $CONFIG->{binds}; |
335 |
root |
1.3 |
|
336 |
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1.21 |
$binds ||= [$NODE]; |
337 |
root |
1.1 |
|
338 |
root |
1.21 |
$WARN->(8, "node $NODE starting up."); |
339 |
root |
1.1 |
|
340 |
root |
1.23 |
$LISTENER = []; |
341 |
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%LISTENER = (); |
342 |
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343 |
root |
1.21 |
for (map _resolve $_, @$binds) { |
344 |
|
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for my $bind ($_->recv) { |
345 |
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my ($host, $port) = AnyEvent::Socket::parse_hostport $bind |
346 |
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or Carp::croak "$bind: unparsable local bind address"; |
347 |
root |
1.20 |
|
348 |
root |
1.21 |
$LISTENER{$bind} = AnyEvent::MP::Transport::mp_server $host, $port; |
349 |
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push @$LISTENER, $bind; |
350 |
|
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} |
351 |
root |
1.1 |
} |
352 |
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|
353 |
root |
1.21 |
# the global service is mandatory currently |
354 |
|
|
require AnyEvent::MP::Global; |
355 |
root |
1.1 |
|
356 |
root |
1.21 |
# connect to all seednodes |
357 |
|
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AnyEvent::MP::Global::set_seeds (map $_->recv, map _resolve $_, @$seeds); |
358 |
root |
1.1 |
|
359 |
root |
1.20 |
for (@{ $CONFIG->{services} }) { |
360 |
root |
1.13 |
if (s/::$//) { |
361 |
|
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eval "require $_"; |
362 |
|
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die $@ if $@; |
363 |
|
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} else { |
364 |
|
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(load_func $_)->(); |
365 |
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} |
366 |
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} |
367 |
root |
1.1 |
} |
368 |
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|
369 |
|
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############################################################################# |
370 |
root |
1.6 |
# node monitoring and info |
371 |
root |
1.3 |
|
372 |
root |
1.21 |
=item node_is_known $nodeid |
373 |
root |
1.13 |
|
374 |
|
|
Returns true iff the given node is currently known to the system. |
375 |
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|
376 |
|
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=cut |
377 |
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|
378 |
|
|
sub node_is_known($) { |
379 |
|
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exists $NODE{$_[0]} |
380 |
|
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} |
381 |
|
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|
382 |
root |
1.21 |
=item node_is_up $nodeid |
383 |
root |
1.13 |
|
384 |
|
|
Returns true if the given node is "up", that is, the kernel thinks it has |
385 |
|
|
a working connection to it. |
386 |
|
|
|
387 |
|
|
If the node is known but not currently connected, returns C<0>. If the |
388 |
|
|
node is not known, returns C<undef>. |
389 |
|
|
|
390 |
|
|
=cut |
391 |
|
|
|
392 |
|
|
sub node_is_up($) { |
393 |
|
|
($NODE{$_[0]} or return)->{transport} |
394 |
|
|
? 1 : 0 |
395 |
|
|
} |
396 |
|
|
|
397 |
root |
1.3 |
=item known_nodes |
398 |
|
|
|
399 |
root |
1.26 |
Returns the node IDs of all nodes currently known to this node, including |
400 |
|
|
itself and nodes not currently connected. |
401 |
root |
1.3 |
|
402 |
|
|
=cut |
403 |
|
|
|
404 |
|
|
sub known_nodes { |
405 |
root |
1.26 |
map $_->{id}, values %NODE |
406 |
root |
1.3 |
} |
407 |
|
|
|
408 |
|
|
=item up_nodes |
409 |
|
|
|
410 |
root |
1.26 |
Return the node IDs of all nodes that are currently connected (excluding |
411 |
|
|
the node itself). |
412 |
root |
1.3 |
|
413 |
|
|
=cut |
414 |
|
|
|
415 |
|
|
sub up_nodes { |
416 |
root |
1.26 |
map $_->{id}, grep $_->{transport}, values %NODE |
417 |
root |
1.3 |
} |
418 |
|
|
|
419 |
root |
1.21 |
=item $guard = mon_nodes $callback->($nodeid, $is_up, @reason) |
420 |
root |
1.3 |
|
421 |
root |
1.27 |
Registers a callback that is called each time a node goes up (a connection |
422 |
|
|
is established) or down (the connection is lost). |
423 |
root |
1.3 |
|
424 |
|
|
Node up messages can only be followed by node down messages for the same |
425 |
|
|
node, and vice versa. |
426 |
|
|
|
427 |
root |
1.27 |
Note that monitoring a node is usually better done by monitoring it's node |
428 |
|
|
port. This function is mainly of interest to modules that are concerned |
429 |
|
|
about the network topology and low-level connection handling. |
430 |
|
|
|
431 |
|
|
Callbacks I<must not> block and I<should not> send any messages. |
432 |
|
|
|
433 |
|
|
The function returns an optional guard which can be used to unregister |
434 |
root |
1.3 |
the monitoring callback again. |
435 |
|
|
|
436 |
|
|
=cut |
437 |
|
|
|
438 |
|
|
our %MON_NODES; |
439 |
|
|
|
440 |
|
|
sub mon_nodes($) { |
441 |
|
|
my ($cb) = @_; |
442 |
|
|
|
443 |
|
|
$MON_NODES{$cb+0} = $cb; |
444 |
|
|
|
445 |
|
|
wantarray && AnyEvent::Util::guard { delete $MON_NODES{$cb+0} } |
446 |
|
|
} |
447 |
|
|
|
448 |
|
|
sub _inject_nodeevent($$;@) { |
449 |
root |
1.16 |
my ($node, $up, @reason) = @_; |
450 |
root |
1.3 |
|
451 |
|
|
for my $cb (values %MON_NODES) { |
452 |
root |
1.21 |
eval { $cb->($node->{id}, $up, @reason); 1 } |
453 |
root |
1.16 |
or $WARN->(1, $@); |
454 |
root |
1.3 |
} |
455 |
root |
1.16 |
|
456 |
root |
1.21 |
$WARN->(7, "$node->{id} is " . ($up ? "up" : "down") . " (@reason)"); |
457 |
root |
1.3 |
} |
458 |
|
|
|
459 |
|
|
############################################################################# |
460 |
root |
1.1 |
# self node code |
461 |
|
|
|
462 |
|
|
our %node_req = ( |
463 |
|
|
# internal services |
464 |
|
|
|
465 |
|
|
# monitoring |
466 |
root |
1.27 |
mon0 => sub { # stop monitoring a port |
467 |
root |
1.1 |
my $portid = shift; |
468 |
|
|
my $node = $SRCNODE; |
469 |
|
|
$NODE{""}->unmonitor ($portid, delete $node->{rmon}{$portid}); |
470 |
|
|
}, |
471 |
root |
1.27 |
mon1 => sub { # start monitoring a port |
472 |
root |
1.1 |
my $portid = shift; |
473 |
|
|
my $node = $SRCNODE; |
474 |
root |
1.27 |
Scalar::Util::weaken $node; #TODO# ugly |
475 |
root |
1.1 |
$NODE{""}->monitor ($portid, $node->{rmon}{$portid} = sub { |
476 |
root |
1.27 |
$node->send (["", kil => $portid, @_]) |
477 |
|
|
if $node && $node->{transport}; #TODO# ugly, should use snd and remove-on-disocnnect |
478 |
root |
1.1 |
}); |
479 |
|
|
}, |
480 |
|
|
kil => sub { |
481 |
|
|
my $cbs = delete $SRCNODE->{lmon}{+shift} |
482 |
|
|
or return; |
483 |
|
|
|
484 |
|
|
$_->(@_) for @$cbs; |
485 |
|
|
}, |
486 |
|
|
|
487 |
root |
1.18 |
# "public" services - not actually public |
488 |
root |
1.1 |
|
489 |
|
|
# relay message to another node / generic echo |
490 |
root |
1.15 |
snd => \&snd, |
491 |
root |
1.27 |
snd_multiple => sub { |
492 |
root |
1.1 |
snd @$_ for @_ |
493 |
|
|
}, |
494 |
|
|
|
495 |
root |
1.4 |
# informational |
496 |
|
|
info => sub { |
497 |
|
|
snd @_, $NODE; |
498 |
|
|
}, |
499 |
|
|
known_nodes => sub { |
500 |
|
|
snd @_, known_nodes; |
501 |
|
|
}, |
502 |
|
|
up_nodes => sub { |
503 |
|
|
snd @_, up_nodes; |
504 |
|
|
}, |
505 |
|
|
|
506 |
root |
1.30 |
# random utilities |
507 |
root |
1.1 |
eval => sub { |
508 |
|
|
my @res = eval shift; |
509 |
|
|
snd @_, "$@", @res if @_; |
510 |
|
|
}, |
511 |
|
|
time => sub { |
512 |
|
|
snd @_, AE::time; |
513 |
|
|
}, |
514 |
|
|
devnull => sub { |
515 |
|
|
# |
516 |
|
|
}, |
517 |
root |
1.15 |
"" => sub { |
518 |
root |
1.27 |
# empty messages are keepalives or similar devnull-applications |
519 |
root |
1.15 |
}, |
520 |
root |
1.1 |
); |
521 |
|
|
|
522 |
root |
1.18 |
$NODE{""} = $NODE{$NODE} = new AnyEvent::MP::Node::Self $NODE; |
523 |
root |
1.1 |
$PORT{""} = sub { |
524 |
|
|
my $tag = shift; |
525 |
|
|
eval { &{ $node_req{$tag} ||= load_func $tag } }; |
526 |
root |
1.16 |
$WARN->(2, "error processing node message: $@") if $@; |
527 |
root |
1.1 |
}; |
528 |
|
|
|
529 |
|
|
=back |
530 |
|
|
|
531 |
|
|
=head1 SEE ALSO |
532 |
|
|
|
533 |
|
|
L<AnyEvent::MP>. |
534 |
|
|
|
535 |
|
|
=head1 AUTHOR |
536 |
|
|
|
537 |
|
|
Marc Lehmann <schmorp@schmorp.de> |
538 |
|
|
http://home.schmorp.de/ |
539 |
|
|
|
540 |
|
|
=cut |
541 |
|
|
|
542 |
|
|
1 |
543 |
|
|
|