Add subnet placement zone param to the Resources method

cloudbridge/cloud/interfaces/resources.py

@@ -856,7 +856,7 @@ class Network(CloudResource):
         pass
 
     @abstractmethod
-    def create_subnet(self, cidr_block, name=None):
+    def create_subnet(self, cidr_block, name=None, zone=None):
         """
         Create a new network subnet and associate it with this Network.
 
@@ -868,6 +868,11 @@ class Network(CloudResource):
         :param name: An optional subnet name. The name will be set if the
                      provider supports it.
 
+        :type zone: ``str``
+        :param zone: Placement zone where to create the subnet. Some providers
+                     may not support subnet zones, in which case the value is
+                     ignored.
+
         :rtype: ``object`` of :class:`.Subnet`
         :return:  A Subnet object
         """

cloudbridge/cloud/providers/aws/resources.py

@@ -961,8 +961,9 @@ class AWSNetwork(BaseNetwork):
         subnets = self._provider.vpc_conn.get_all_subnets(filters=flter)
         return [AWSSubnet(self._provider, subnet) for subnet in subnets]
 
-    def create_subnet(self, cidr_block, name=None):
-        subnet = self._provider.vpc_conn.create_subnet(self.id, cidr_block)
+    def create_subnet(self, cidr_block, name=None, zone=None):
+        subnet = self._provider.vpc_conn.create_subnet(self.id, cidr_block,
+                                                       availability_zone=zone)
         cb_subnet = AWSSubnet(self._provider, subnet)
         if name:
             cb_subnet.name = name

cloudbridge/cloud/providers/openstack/resources.py

@@ -691,7 +691,8 @@ class OpenStackNetwork(BaseNetwork):
                    .get('subnets', []))
         return [OpenStackSubnet(self._provider, subnet) for subnet in subnets]
 
-    def create_subnet(self, cidr_block, name=''):
+    def create_subnet(self, cidr_block, name='', zone=None):
+        """OpenStack has no support for subnet zones so the value is ignored"""
         subnet_info = {'name': name, 'network_id': self.id,
                        'cidr': cidr_block, 'ip_version': 4}
         subnet = (self._provider.neutron.create_subnet({'subnet': subnet_info})