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=head1 NAME |
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AnyEvent::MP::Kernel - the actual message passing kernel |
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=head1 SYNOPSIS |
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use AnyEvent::MP::Kernel; |
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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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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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our @EXPORT = qw( |
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1.13 |
%NODE %PORT %PORT_DATA $UNIQ $RUNIQ $ID |
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add_node load_func snd_to_func snd_on eval_on |
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NODE $NODE node_of snd kil port_is_local |
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configure |
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1.46 |
up_nodes mon_nodes node_is_up |
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1.1 |
); |
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1.16 |
=item $AnyEvent::MP::Kernel::WARN->($level, $msg) |
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This value is called with an error or warning message, when e.g. a |
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connection could not be created, authorisation failed and so on. |
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It I<must not> block or send messages -queue it and use an idle watcher if |
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you need to do any of these things. |
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C<$level> should be C<0> for messages to 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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=item @AnyEvent::MP::Kernel::WARN |
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All code references in this array are called for every log message, from |
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the default C<$WARN> handler. This is an easy way to tie into the log |
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messages without disturbing others. |
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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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our @WARN; |
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our $WARN = sub { |
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&$_ for @WARN; |
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return if $WARNLEVEL < $_[0]; |
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my ($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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=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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local $@; |
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unless (eval "require $pkg; 1") { |
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my $error = $@; |
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$error =~ /^Can't locate .*.pm in \@INC \(/ |
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or return sub { die $error }; |
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} |
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} until defined &$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, $_[0]; |
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} else { |
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# shit... |
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$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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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 "nna*", $$ & 0xffff, time & 0xffff, nonce 2 |
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} |
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our $CONFIG; # this node's configuration |
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our $RUNIQ = alnumbits nonce 96/8; # remote uniq value |
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our $UNIQ = gen_uniq; # per-process/node unique cookie |
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our $NODE = "anon/$RUNIQ"; |
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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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our %RMON; # local ports monitored by remote nodes ($RMON{nodeid}{portid} == cb) |
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our %LMON; # monitored _local_ ports |
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our %LISTENER; |
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our $LISTENER; # our listeners, as arrayref |
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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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my ($node, undef) = split /#/, $_[0], 2; |
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$node |
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} |
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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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our $DELAY_TIMER; |
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our @DELAY_QUEUE; |
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sub _delay_run { |
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(shift @DELAY_QUEUE or return undef $DELAY_TIMER)->() while 1; |
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} |
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sub delay($) { |
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push @DELAY_QUEUE, shift; |
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$DELAY_TIMER ||= AE::timer 0, 0, \&_delay_run; |
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} |
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sub _inject { |
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warn "RCV $SRCNODE->{id} -> " . eval { JSON::XS->new->encode (\@_) } . "\n" if TRACE && @_;#d# |
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&{ $PORT{+shift} or return }; |
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} |
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# 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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sub add_node { |
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my ($node) = @_; |
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$NODE{$node} ||= new AnyEvent::MP::Node::Direct $node |
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1.13 |
} |
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sub snd(@) { |
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my ($nodeid, $portid) = split /#/, shift, 2; |
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warn "SND $nodeid <- " . eval { JSON::XS->new->encode (\@_) } . "\n" if TRACE && @_;#d# |
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defined $nodeid #d#UGLY |
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or Carp::croak "'undef' is not a valid node ID/port ID"; |
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($NODE{$nodeid} || add_node $nodeid) |
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->{send} (["$portid", @_]); |
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} |
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=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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my ($nodeid, undef) = split /#/, $_[0], 2; |
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1.21 |
$NODE{$nodeid} == $NODE{""} |
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1.17 |
} |
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=item snd_to_func $node, $func, @args |
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Expects a node ID and a name of a function. Asynchronously tries to call |
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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($$;@) { |
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1.21 |
my $nodeid = shift; |
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1.11 |
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1.41 |
# on $NODE, we artificially delay... (for spawn) |
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# this is very ugly - maybe we should simply delay ALL messages, |
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# to avoid deep recursion issues. but that's so... slow... |
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1.45 |
$AnyEvent::MP::Node::Self::DELAY = 1 |
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if $nodeid ne $NODE; |
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1.49 |
defined $nodeid #d#UGLY |
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or Carp::croak "'undef' is not a valid node ID/port ID"; |
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1.45 |
($NODE{$nodeid} || add_node $nodeid)->send (["", @_]); |
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1.11 |
} |
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1.18 |
=item snd_on $node, @msg |
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Executes C<snd> with the given C<@msg> (which must include the destination |
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port) on the given node. |
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=cut |
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sub snd_on($@) { |
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my $node = shift; |
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snd $node, snd => @_; |
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} |
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1.29 |
=item eval_on $node, $string[, @reply] |
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1.18 |
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1.29 |
Evaluates the given string as Perl expression on the given node. When |
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@reply is specified, then it is used to construct a reply message with |
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C<"$@"> and any results from the eval appended. |
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1.18 |
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=cut |
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1.29 |
sub eval_on($$;@) { |
279 |
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1.18 |
my $node = shift; |
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snd $node, eval => @_; |
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} |
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1.1 |
sub kil(@) { |
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1.21 |
my ($nodeid, $portid) = split /#/, shift, 2; |
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1.1 |
|
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length $portid |
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1.21 |
or Carp::croak "$nodeid#$portid: killing a node port is not allowed, caught"; |
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|
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1.21 |
($NODE{$nodeid} || add_node $nodeid) |
290 |
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1.1 |
->kill ("$portid", @_); |
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} |
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1.7 |
sub _nodename { |
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require POSIX; |
295 |
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(POSIX::uname ())[1] |
296 |
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} |
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1.21 |
sub _resolve($) { |
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my ($nodeid) = @_; |
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1.1 |
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my $cv = AE::cv; |
302 |
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my @res; |
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304 |
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$cv->begin (sub { |
305 |
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my %seen; |
306 |
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my @refs; |
307 |
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for (sort { $a->[0] <=> $b->[0] } @res) { |
308 |
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push @refs, $_->[1] unless $seen{$_->[1]}++ |
309 |
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} |
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1.21 |
shift->send (@refs); |
311 |
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1.1 |
}); |
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my $idx; |
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1.21 |
for my $t (split /,/, $nodeid) { |
315 |
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1.1 |
my $pri = ++$idx; |
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1.7 |
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$t = length $t ? _nodename . ":$t" : _nodename |
318 |
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if $t =~ /^\d*$/; |
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1.1 |
|
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1.34 |
my ($host, $port) = AnyEvent::Socket::parse_hostport $t, 0 |
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1.7 |
or Carp::croak "$t: unparsable transport descriptor"; |
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1.33 |
$port = "0" if $port eq "*"; |
324 |
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325 |
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if ($host eq "*") { |
326 |
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$cv->begin; |
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# use fork_call, as Net::Interface is big, and we need it rarely. |
328 |
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require AnyEvent::Util; |
329 |
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AnyEvent::Util::fork_call ( |
330 |
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sub { |
331 |
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my @addr; |
332 |
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333 |
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require Net::Interface; |
334 |
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335 |
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for my $if (Net::Interface->interfaces) { |
336 |
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# we statically lower-prioritise ipv6 here, TODO :() |
337 |
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1.47 |
for $_ ($if->address (Net::Interface::AF_INET ())) { |
338 |
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1.33 |
next if /^\x7f/; # skip localhost etc. |
339 |
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push @addr, $_; |
340 |
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} |
341 |
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for ($if->address (Net::Interface::AF_INET6 ())) { |
342 |
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#next if $if->scope ($_) <= 2; |
343 |
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next unless /^[\x20-\x3f\xfc\xfd]/; # global unicast, site-local unicast |
344 |
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push @addr, $_; |
345 |
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} |
346 |
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347 |
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} |
348 |
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@addr |
349 |
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}, sub { |
350 |
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for my $ip (@_) { |
351 |
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push @res, [ |
352 |
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$pri += 1e-5, |
353 |
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AnyEvent::Socket::format_hostport AnyEvent::Socket::format_address $ip, $port |
354 |
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]; |
355 |
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} |
356 |
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$cv->end; |
357 |
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} |
358 |
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); |
359 |
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} else { |
360 |
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$cv->begin; |
361 |
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AnyEvent::Socket::resolve_sockaddr $host, $port, "tcp", 0, undef, sub { |
362 |
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for (@_) { |
363 |
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my ($service, $host) = AnyEvent::Socket::unpack_sockaddr $_->[3]; |
364 |
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push @res, [ |
365 |
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$pri += 1e-5, |
366 |
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AnyEvent::Socket::format_hostport AnyEvent::Socket::format_address $host, $service |
367 |
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]; |
368 |
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} |
369 |
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$cv->end; |
370 |
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}; |
371 |
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} |
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1.1 |
} |
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374 |
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$cv->end; |
375 |
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376 |
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$cv |
377 |
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} |
378 |
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379 |
root |
1.39 |
sub configure(@) { |
380 |
|
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unshift @_, "profile" if @_ & 1; |
381 |
root |
1.34 |
my (%kv) = @_; |
382 |
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383 |
|
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my $profile = delete $kv{profile}; |
384 |
root |
1.1 |
|
385 |
root |
1.21 |
$profile = _nodename |
386 |
|
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unless defined $profile; |
387 |
root |
1.6 |
|
388 |
root |
1.32 |
$CONFIG = AnyEvent::MP::Config::find_profile $profile, %kv; |
389 |
root |
1.24 |
|
390 |
root |
1.47 |
delete $NODE{$NODE}; # we do not support doing stuff before configure |
391 |
|
|
|
392 |
root |
1.24 |
my $node = exists $CONFIG->{nodeid} ? $CONFIG->{nodeid} : $profile; |
393 |
root |
1.51 |
|
394 |
|
|
$node or Carp::croak "$node: illegal node ID (see AnyEvent::MP manpage for syntax)\n"; |
395 |
|
|
|
396 |
root |
1.24 |
$NODE = $node |
397 |
|
|
unless $node eq "anon/"; |
398 |
root |
1.6 |
|
399 |
root |
1.21 |
$NODE{$NODE} = $NODE{""}; |
400 |
|
|
$NODE{$NODE}{id} = $NODE; |
401 |
root |
1.20 |
|
402 |
root |
1.21 |
my $seeds = $CONFIG->{seeds}; |
403 |
|
|
my $binds = $CONFIG->{binds}; |
404 |
root |
1.3 |
|
405 |
root |
1.33 |
$binds ||= ["*"]; |
406 |
root |
1.1 |
|
407 |
root |
1.21 |
$WARN->(8, "node $NODE starting up."); |
408 |
root |
1.1 |
|
409 |
root |
1.23 |
$LISTENER = []; |
410 |
|
|
%LISTENER = (); |
411 |
|
|
|
412 |
root |
1.21 |
for (map _resolve $_, @$binds) { |
413 |
|
|
for my $bind ($_->recv) { |
414 |
|
|
my ($host, $port) = AnyEvent::Socket::parse_hostport $bind |
415 |
|
|
or Carp::croak "$bind: unparsable local bind address"; |
416 |
root |
1.20 |
|
417 |
root |
1.33 |
my $listener = AnyEvent::MP::Transport::mp_server |
418 |
|
|
$host, |
419 |
|
|
$port, |
420 |
|
|
prepare => sub { |
421 |
|
|
my (undef, $host, $port) = @_; |
422 |
|
|
$bind = AnyEvent::Socket::format_hostport $host, $port; |
423 |
root |
1.53 |
0 |
424 |
root |
1.33 |
}, |
425 |
|
|
; |
426 |
|
|
$LISTENER{$bind} = $listener; |
427 |
root |
1.21 |
push @$LISTENER, $bind; |
428 |
|
|
} |
429 |
root |
1.1 |
} |
430 |
|
|
|
431 |
root |
1.40 |
$WARN->(8, "node listens on [@$LISTENER]."); |
432 |
|
|
|
433 |
root |
1.21 |
# the global service is mandatory currently |
434 |
|
|
require AnyEvent::MP::Global; |
435 |
root |
1.1 |
|
436 |
root |
1.21 |
# connect to all seednodes |
437 |
|
|
AnyEvent::MP::Global::set_seeds (map $_->recv, map _resolve $_, @$seeds); |
438 |
root |
1.1 |
|
439 |
root |
1.20 |
for (@{ $CONFIG->{services} }) { |
440 |
root |
1.43 |
if (ref) { |
441 |
|
|
my ($func, @args) = @$_; |
442 |
|
|
(load_func $func)->(@args); |
443 |
|
|
} elsif (s/::$//) { |
444 |
root |
1.13 |
eval "require $_"; |
445 |
|
|
die $@ if $@; |
446 |
|
|
} else { |
447 |
|
|
(load_func $_)->(); |
448 |
|
|
} |
449 |
|
|
} |
450 |
root |
1.1 |
} |
451 |
|
|
|
452 |
|
|
############################################################################# |
453 |
root |
1.6 |
# node monitoring and info |
454 |
root |
1.3 |
|
455 |
root |
1.21 |
=item node_is_known $nodeid |
456 |
root |
1.13 |
|
457 |
root |
1.46 |
Returns true iff the given node is currently known to the system. The only |
458 |
|
|
time a node is known but not up currently is when a conenction request is |
459 |
|
|
pending. |
460 |
root |
1.13 |
|
461 |
|
|
=cut |
462 |
|
|
|
463 |
|
|
sub node_is_known($) { |
464 |
|
|
exists $NODE{$_[0]} |
465 |
|
|
} |
466 |
|
|
|
467 |
root |
1.21 |
=item node_is_up $nodeid |
468 |
root |
1.13 |
|
469 |
|
|
Returns true if the given node is "up", that is, the kernel thinks it has |
470 |
|
|
a working connection to it. |
471 |
|
|
|
472 |
|
|
If the node is known but not currently connected, returns C<0>. If the |
473 |
|
|
node is not known, returns C<undef>. |
474 |
|
|
|
475 |
|
|
=cut |
476 |
|
|
|
477 |
|
|
sub node_is_up($) { |
478 |
|
|
($NODE{$_[0]} or return)->{transport} |
479 |
|
|
? 1 : 0 |
480 |
|
|
} |
481 |
|
|
|
482 |
root |
1.3 |
=item known_nodes |
483 |
|
|
|
484 |
root |
1.26 |
Returns the node IDs of all nodes currently known to this node, including |
485 |
|
|
itself and nodes not currently connected. |
486 |
root |
1.3 |
|
487 |
|
|
=cut |
488 |
|
|
|
489 |
root |
1.49 |
sub known_nodes() { |
490 |
root |
1.26 |
map $_->{id}, values %NODE |
491 |
root |
1.3 |
} |
492 |
|
|
|
493 |
|
|
=item up_nodes |
494 |
|
|
|
495 |
root |
1.26 |
Return the node IDs of all nodes that are currently connected (excluding |
496 |
|
|
the node itself). |
497 |
root |
1.3 |
|
498 |
|
|
=cut |
499 |
|
|
|
500 |
root |
1.49 |
sub up_nodes() { |
501 |
root |
1.26 |
map $_->{id}, grep $_->{transport}, values %NODE |
502 |
root |
1.3 |
} |
503 |
|
|
|
504 |
root |
1.21 |
=item $guard = mon_nodes $callback->($nodeid, $is_up, @reason) |
505 |
root |
1.3 |
|
506 |
root |
1.27 |
Registers a callback that is called each time a node goes up (a connection |
507 |
|
|
is established) or down (the connection is lost). |
508 |
root |
1.3 |
|
509 |
|
|
Node up messages can only be followed by node down messages for the same |
510 |
|
|
node, and vice versa. |
511 |
|
|
|
512 |
root |
1.27 |
Note that monitoring a node is usually better done by monitoring it's node |
513 |
|
|
port. This function is mainly of interest to modules that are concerned |
514 |
|
|
about the network topology and low-level connection handling. |
515 |
|
|
|
516 |
|
|
Callbacks I<must not> block and I<should not> send any messages. |
517 |
|
|
|
518 |
|
|
The function returns an optional guard which can be used to unregister |
519 |
root |
1.3 |
the monitoring callback again. |
520 |
|
|
|
521 |
root |
1.46 |
Example: make sure you call function C<newnode> for all nodes that are up |
522 |
|
|
or go up (and down). |
523 |
|
|
|
524 |
|
|
newnode $_, 1 for up_nodes; |
525 |
|
|
mon_nodes \&newnode; |
526 |
|
|
|
527 |
root |
1.3 |
=cut |
528 |
|
|
|
529 |
|
|
our %MON_NODES; |
530 |
|
|
|
531 |
|
|
sub mon_nodes($) { |
532 |
|
|
my ($cb) = @_; |
533 |
|
|
|
534 |
|
|
$MON_NODES{$cb+0} = $cb; |
535 |
|
|
|
536 |
|
|
wantarray && AnyEvent::Util::guard { delete $MON_NODES{$cb+0} } |
537 |
|
|
} |
538 |
|
|
|
539 |
|
|
sub _inject_nodeevent($$;@) { |
540 |
root |
1.16 |
my ($node, $up, @reason) = @_; |
541 |
root |
1.3 |
|
542 |
|
|
for my $cb (values %MON_NODES) { |
543 |
root |
1.21 |
eval { $cb->($node->{id}, $up, @reason); 1 } |
544 |
root |
1.16 |
or $WARN->(1, $@); |
545 |
root |
1.3 |
} |
546 |
root |
1.16 |
|
547 |
root |
1.21 |
$WARN->(7, "$node->{id} is " . ($up ? "up" : "down") . " (@reason)"); |
548 |
root |
1.3 |
} |
549 |
|
|
|
550 |
|
|
############################################################################# |
551 |
root |
1.1 |
# self node code |
552 |
|
|
|
553 |
|
|
our %node_req = ( |
554 |
|
|
# internal services |
555 |
|
|
|
556 |
|
|
# monitoring |
557 |
root |
1.27 |
mon0 => sub { # stop monitoring a port |
558 |
root |
1.1 |
my $portid = shift; |
559 |
|
|
my $node = $SRCNODE; |
560 |
|
|
$NODE{""}->unmonitor ($portid, delete $node->{rmon}{$portid}); |
561 |
|
|
}, |
562 |
root |
1.27 |
mon1 => sub { # start monitoring a port |
563 |
root |
1.1 |
my $portid = shift; |
564 |
|
|
my $node = $SRCNODE; |
565 |
root |
1.59 |
Scalar::Util::weaken $node; |
566 |
root |
1.1 |
$NODE{""}->monitor ($portid, $node->{rmon}{$portid} = sub { |
567 |
root |
1.58 |
delete $node->{rmon}{$portid}; |
568 |
root |
1.27 |
$node->send (["", kil => $portid, @_]) |
569 |
root |
1.59 |
if $node && $node->{transport}; |
570 |
root |
1.1 |
}); |
571 |
|
|
}, |
572 |
|
|
kil => sub { |
573 |
|
|
my $cbs = delete $SRCNODE->{lmon}{+shift} |
574 |
|
|
or return; |
575 |
|
|
|
576 |
|
|
$_->(@_) for @$cbs; |
577 |
|
|
}, |
578 |
|
|
|
579 |
root |
1.18 |
# "public" services - not actually public |
580 |
root |
1.1 |
|
581 |
|
|
# relay message to another node / generic echo |
582 |
root |
1.15 |
snd => \&snd, |
583 |
root |
1.27 |
snd_multiple => sub { |
584 |
root |
1.1 |
snd @$_ for @_ |
585 |
|
|
}, |
586 |
|
|
|
587 |
root |
1.4 |
# informational |
588 |
|
|
info => sub { |
589 |
|
|
snd @_, $NODE; |
590 |
|
|
}, |
591 |
|
|
known_nodes => sub { |
592 |
|
|
snd @_, known_nodes; |
593 |
|
|
}, |
594 |
|
|
up_nodes => sub { |
595 |
|
|
snd @_, up_nodes; |
596 |
|
|
}, |
597 |
|
|
|
598 |
root |
1.30 |
# random utilities |
599 |
root |
1.1 |
eval => sub { |
600 |
root |
1.50 |
my @res = do { package main; eval shift }; |
601 |
root |
1.1 |
snd @_, "$@", @res if @_; |
602 |
|
|
}, |
603 |
|
|
time => sub { |
604 |
|
|
snd @_, AE::time; |
605 |
|
|
}, |
606 |
|
|
devnull => sub { |
607 |
|
|
# |
608 |
|
|
}, |
609 |
root |
1.15 |
"" => sub { |
610 |
root |
1.27 |
# empty messages are keepalives or similar devnull-applications |
611 |
root |
1.15 |
}, |
612 |
root |
1.1 |
); |
613 |
|
|
|
614 |
root |
1.18 |
$NODE{""} = $NODE{$NODE} = new AnyEvent::MP::Node::Self $NODE; |
615 |
root |
1.1 |
$PORT{""} = sub { |
616 |
|
|
my $tag = shift; |
617 |
|
|
eval { &{ $node_req{$tag} ||= load_func $tag } }; |
618 |
root |
1.16 |
$WARN->(2, "error processing node message: $@") if $@; |
619 |
root |
1.1 |
}; |
620 |
|
|
|
621 |
|
|
=back |
622 |
|
|
|
623 |
|
|
=head1 SEE ALSO |
624 |
|
|
|
625 |
|
|
L<AnyEvent::MP>. |
626 |
|
|
|
627 |
|
|
=head1 AUTHOR |
628 |
|
|
|
629 |
|
|
Marc Lehmann <schmorp@schmorp.de> |
630 |
|
|
http://home.schmorp.de/ |
631 |
|
|
|
632 |
|
|
=cut |
633 |
|
|
|
634 |
|
|
1 |
635 |
|
|
|