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=head1 NAME |
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AnyEvent::MP::DataConn - create socket connections between nodes |
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=head1 SYNOPSIS |
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use AnyEvent::MP::DataConn; |
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=head1 DESCRIPTION |
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This module can be used to create socket connections between the local and |
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a remote node in the aemp network. The socket can be used freely for any |
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purpose, and in most cases, this mechanism is a good way to transport big |
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chunks of binary data. |
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The connections created by this module use the same security mechanisms |
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as normal AEMP connections (secure authentication, optional use of TLS), |
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and in fact, use the same listening port as AEMP connections, so when two |
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nodes can reach each other, they can, with high probability, creare a data |
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connection between them. |
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The protocol is, however, not the AEMP transport protocol, so this will |
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only work between nodes implementing the "aemp-dataconn" protocol. |
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=head1 FUNCTIONS |
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=over 4 |
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=cut |
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package AnyEvent::MP::DataConn; |
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use common::sense; |
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use Carp (); |
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use POSIX (); |
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use AnyEvent (); |
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use AnyEvent::Util (); |
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use AnyEvent::MP; |
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use AnyEvent::MP::Kernel; |
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sub _inject { |
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my ($conn, $error) = @_; |
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} |
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=item AnyEvent::MP::DataConn::connect_to $node, $timeout, [$initfunc, @initdata], @localmsg |
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Creates a socket connection between the local node and the node C<$node> |
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(which can also be specified as a port). |
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When the connection could be successfully created, the C<$initfunc> |
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will be called with the given C<@initdata> on the remote node (similar |
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to C<snd_to_func> or C<spawn>), and the C<AnyEvent::Handle> object |
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representing the connection as additional argument. |
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Also, the local port in which context C<connect_to> was called (C<$SELF>) |
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will receive a message with contents C<@localmsg>, again with the |
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AnyEvent::Handle object tacked to the end. |
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The AnyEvent::Handle object will be in a "quiescent" state - you could rip |
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out the file handle and forget about it, but it is recommended to use it, |
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as the security settings might have called for a TLS connection. IF you |
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opt to use it, you at least have to set an C<on_error> callback. |
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In case of any error (or timeout), nothing will be called on the |
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remote side, and the local port will be C<kil>'ed with an C<< |
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AnyEvent::MP::DataConn => "error message" >> kill reason. |
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=cut |
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sub connect_to($$$;@) { |
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my ($node, $timeout, $initspec, @localmsg) = @_; |
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my $port = $SELF; |
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$node = node_of $node; |
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my %state; |
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$state{to} = AE::timer $timeout, 0, sub { |
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%state = (); |
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kil $port, AnyEvent::MP::DataConn:: => "$node: unable to establish connection within $timeout seconds"; |
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}; |
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my $continue_connect = sub { |
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use Data::Dumper; |
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warn Dumper $NODE{$node};#d# |
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}; |
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if (port_is_local $node) { |
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return kil $port, AnyEvent::MP::DataConn:: => |
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"connect_to does not yet support local/local connections, please bug me about it"; |
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} elsif (node_is_up $node) { |
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$continue_connect->(); |
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} else { |
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$state{mon_nodes} = mon_nodes sub { |
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return unless $_[0] eq $node && $_[1]; |
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delete $state{mon_nodes}; |
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$continue_connect->() |
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}; |
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} |
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} |
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=back |
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=head1 SEE ALSO |
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L<AnyEvent::MP>. |
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=head1 AUTHOR |
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Marc Lehmann <schmorp@schmorp.de> |
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http://home.schmorp.de/ |
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=cut |
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1 |
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