Find IPs on OpenStack clouds without floating-ips

The floating-ip extension, while pretty ubiquitous, is not a
foregone conclusion. Specifically, Rackspace, while also
served by the rax module, is a valid OpenStack cloud and can
be interacted with directly via nova interfaces.

Add support for determining public and private IPs for
OpenStack clouds that don't use floating ips by reading
the public and private keys from the addresses dict.

cloud/nova_compute

@@ -299,6 +299,19 @@ def _add_floating_ip(module, nova, server):
     return server
 
 
+def _get_ips(addresses, ext_tag, key_name):
+
+    ret = []
+    for (k, v) in addresses.iteritems():
+        if k == key_name:
+            ret.extend([addrs['addr'] for addrs in v])
+        else:
+            for interface_spec in v:
+                if 'OS-EXT-IPS:type' in interface_spec and interface_spec['OS-EXT-IPS:type'] == ext_tag:
+                    ret.append(interface_spec['addr'])
+    return ret
+
+
 def _create_server(module, nova):
     # issue an error early on and not launch the instance
     if module.params['floating_ip'] is not None:
@@ -339,8 +352,9 @@ def _create_server(module, nova):
                 if module.params['floating_ip'] is not None:
                     server = _add_floating_ip(module, nova, server)
 
-                private = [ x['addr'] for x in getattr(server, 'addresses').itervalues().next() if 'OS-EXT-IPS:type' in x and x['OS-EXT-IPS:type'] == 'fixed']
-                public  = [ x['addr'] for x in getattr(server, 'addresses').itervalues().next() if 'OS-EXT-IPS:type' in x and x['OS-EXT-IPS:type'] == 'floating']
+                private = _get_ips(getattr(server, 'addresses'), 'fixed', 'private')
+                public = _get_ips(getattr(server, 'addresses'), 'floating', 'public')
+
                 # now exit with info 
                 module.exit_json(changed = True, id = server.id, private_ip=''.join(private), public_ip=''.join(public), status = server.status, info = server._info)
 
@@ -351,8 +365,8 @@ def _create_server(module, nova):
         module.fail_json(msg = "Timeout waiting for the server to come up.. Please check manually")
     if server.status == 'ERROR':
             module.fail_json(msg = "Error in creating the server.. Please check manually")
-    private = [ x['addr'] for x in getattr(server, 'addresses').itervalues().next() if x['OS-EXT-IPS:type'] == 'fixed']
-    public  = [ x['addr'] for x in getattr(server, 'addresses').itervalues().next() if x['OS-EXT-IPS:type'] == 'floating']
+    private = _get_ips(getattr(server, 'addresses'), 'fixed', 'private')
+    public = _get_ips(getattr(server, 'addresses'), 'floating', 'public')
 
     module.exit_json(changed = True, id = info['id'], private_ip=''.join(private), public_ip=''.join(public), status = server.status, info = server._info)
 
@@ -373,8 +387,8 @@ def _get_server_state(module, nova):
     if server and module.params['state'] == 'present':
         if server.status != 'ACTIVE':
             module.fail_json( msg="The VM is available but not Active. state:" + server.status)
-        private = [ x['addr'] for x in getattr(server, 'addresses').itervalues().next() if 'OS-EXT-IPS:type' in x and x['OS-EXT-IPS:type'] == 'fixed']
-        public  = [ x['addr'] for x in getattr(server, 'addresses').itervalues().next() if 'OS-EXT-IPS:type' in x and x['OS-EXT-IPS:type'] == 'floating']
+        private = _get_ips(getattr(server, 'addresses'), 'fixed', 'private')
+        public = _get_ips(getattr(server, 'addresses'), 'floating', 'public')
         module.exit_json(changed = False, id = server.id, public_ip = ''.join(public), private_ip = ''.join(private), info = server._info)
     if server and module.params['state'] == 'absent':
         return True