Object
A RingServer allows a Rinda::TupleSpace to be located via UDP broadcasts. Default service location uses the following steps:
A RingServer begins listening on the network broadcast UDP address.
A RingFinger sends a UDP packet containing the DRb URI where it will listen for a reply.
The RingServer receives the UDP packet and connects back to the provided DRb URI with the DRb service.
A RingServer requires a TupleSpace:
ts = Rinda::TupleSpace.new rs = Rinda::RingServer.new
RingServer can also listen on multicast addresses for announcements. This allows multiple RingServers to run on the same host. To use network broadcast and multicast:
ts = Rinda::TupleSpace.new rs = Rinda::RingServer.new ts, %w[Socket::INADDR_ANY, 239.0.0.1 ff02::1]
Advertises ts
on the given addresses
at
port
.
If addresses
is omitted only the UDP broadcast address is
used.
addresses
can contain multiple addresses. If a multicast
address is given in addresses
then the RingServer will listen for multicast queries.
If you use IPv4 multicast you may need to set an address of the inbound interface which joins a multicast group.
ts = Rinda::TupleSpace.new rs = Rinda::RingServer.new(ts, [['239.0.0.1', '9.5.1.1']])
You can set addresses as an Array Object. The first element of the Array is a multicast address and the second is an inbound interface address. If the second is omitted then ‘0.0.0.0’ is used.
If you use IPv6 multicast you may need to set both the local interface address and the inbound interface index:
rs = Rinda::RingServer.new(ts, [['ff02::1', '::1', 1]])
The first element is a multicast address and the second is an inbound interface address. The third is an inbound interface index.
At this time there is no easy way to get an interface index by name.
If the second is omitted then ‘::1’ is used. If the third is omitted then 0 (default interface) is used.
# File rinda/ring.rb, line 94 def initialize(ts, addresses=[Socket::INADDR_ANY], port=Ring_PORT) @port = port if Integer === addresses then addresses, @port = [Socket::INADDR_ANY], addresses end @renewer = Renewer.new @ts = ts @sockets = [] addresses.each do |address| if Array === address make_socket(*address) else make_socket(address) end end @w_services = write_services @r_service = reply_service end
Pulls lookup tuples out of the TupleSpace and sends their DRb object the address of the local TupleSpace.
# File rinda/ring.rb, line 218 def do_reply tuple = @ts.take([:lookup_ring, nil], @renewer) Thread.new { tuple[1].call(@ts) rescue nil} rescue end
Extracts the response URI from msg
and adds it to TupleSpace where it will be picked up by
reply_service
for notification.
# File rinda/ring.rb, line 193 def do_write(msg) Thread.new do begin tuple, sec = Marshal.load(msg) @ts.write(tuple, sec) rescue end end end
Creates a socket at address
If address
is multicast address then
interface_address
and multicast_interface
can be
set as optional.
A created socket is bound to interface_address
. If you use
IPv4 multicast then the interface of interface_address
is used
as the inbound interface. If interface_address
is omitted or
nil then ‘0.0.0.0’ or ‘::1’ is used.
If you use IPv6 multicast then multicast_interface
is used as
the inbound interface. multicast_interface
is a network
interface index. If multicast_interface
is omitted then 0
(default interface) is used.
# File rinda/ring.rb, line 132 def make_socket(address, interface_address=nil, multicast_interface=0) addrinfo = Addrinfo.udp(address, @port) socket = Socket.new(addrinfo.pfamily, addrinfo.socktype, addrinfo.protocol) if addrinfo.ipv4_multicast? or addrinfo.ipv6_multicast? then if Socket.const_defined?(:SO_REUSEPORT) then socket.setsockopt(:SOCKET, :SO_REUSEPORT, true) else socket.setsockopt(:SOCKET, :SO_REUSEADDR, true) end if addrinfo.ipv4_multicast? then interface_address = '0.0.0.0' if interface_address.nil? socket.bind(Addrinfo.udp(interface_address, @port)) mreq = IPAddr.new(addrinfo.ip_address).hton + IPAddr.new(interface_address).hton socket.setsockopt(:IPPROTO_IP, :IP_ADD_MEMBERSHIP, mreq) else interface_address = '::1' if interface_address.nil? socket.bind(Addrinfo.udp(interface_address, @port)) mreq = IPAddr.new(addrinfo.ip_address).hton + [multicast_interface].pack('I') socket.setsockopt(:IPPROTO_IPV6, :IPV6_JOIN_GROUP, mreq) end else socket.bind(addrinfo) end socket rescue socket = socket.close if socket raise ensure @sockets << socket if socket end
Creates a thread that notifies waiting clients from the TupleSpace.
# File rinda/ring.rb, line 206 def reply_service Thread.new do loop do do_reply end end end
Shuts down the RingServer
# File rinda/ring.rb, line 227 def shutdown @renewer.renew = false @w_services.each do |thread| thread.kill thread.join end @sockets.each do |socket| socket.close end @r_service.kill @r_service.join end
Creates threads that pick up UDP packets and passes them to #do_write for decoding.
# File rinda/ring.rb, line 178 def write_services @sockets.map do |s| Thread.new(s) do |socket| loop do msg = socket.recv(1024) do_write(msg) end end end end