multicast: Fix 100% cpu load from select use

Implement select in multicast.py to fix immediate return causing 100% cpu load
See merge request !39

re6st/cli/node.py

@@ -366,12 +366,6 @@ def main():
                     R[r] = partial(tunnel_manager.handleServerEvent, r)
                     x.close()
 
-            if config.multicast:
-                from re6st.multicast import PimDm
-                pimdm = PimDm()
-                cleanup.append(pimdm.run(config.iface_list, config.run).stop)
-                R[pimdm.s_netlink] = pimdm.addInterfaceWhenReady
-
             ip('addr', my_ip + '/%s' % len(subnet),
                'dev', config.main_interface)
             if_rt = ['ip', '-6', 'route', 'del',
@@ -458,6 +452,11 @@ def main():
             select_list = [forwarder.select] if forwarder else []
             if config.console:
                 select_list.append(console.select)
+            if config.multicast:
+                from re6st.multicast import PimDm
+                pimdm = PimDm()
+                cleanup.append(pimdm.run(config.iface_list, config.run).stop)
+                select_list.append(pimdm.select)
             select_list += tunnel_manager.select, utils.select
             while True:
                 args = R.copy(), {}, []

re6st/multicast.py

@@ -72,9 +72,6 @@ class PimDm(object):
         subprocess.call(['pim-dm', '-aimld', ifname])
 
     def addInterfaceWhenReady(self):
-        if not self.not_ready_iface_set:
-            return
-
         data = self.s_netlink.recv(65535)
         unpack = unpacker(data)
         msg_len, msg_type, flags, seq, pid = unpack("=LHHLL")
@@ -127,6 +124,10 @@ class PimDm(object):
 
         return utils.Popen(['pim-dm', '-config', conf_file_path])
 
+    def select(self, r, w, t):
+        if self.not_ready_iface_set:
+            r[self.s_netlink] = self.addInterfaceWhenReady
+
 def ifap_iter(ifa):
     '''Iterate over linked list of ifaddrs'''
     while ifa: