[google|compute] Update Addresses suport

- Modify "list_aggregated_addresses" to support filters
- Add "get_by_ip_address" model method
- Add ability to assign/deassign an IP to a server

lib/fog/google/models/compute/address.rb

@@ -24,6 +24,17 @@ module Fog
         IN_USE_STATE   = 'IN_USE'
         RESERVED_STATE = 'RESERVED'
 
+        def server
+          return nil if !in_use? || self.users.nil? || self.users.empty?
+
+          service.servers.get(self.users.first.split('/')[-1])
+        end
+
+        def server=(server)
+          requires :identity, :region
+          server ? associate(server) : disassociate
+        end
+
         def save
           requires :identity, :region
 
@@ -55,6 +66,29 @@ module Fog
         def in_use?
           self.status == IN_USE_STATE
         end
+
+        private
+
+        def associate(server)
+          nic = server.network_interfaces.first['name']
+          data = service.add_server_access_config(server.name, server.zone_name, nic, :address => self.address)
+          Fog::Compute::Google::Operations.new(:service => service).get(data.body['name'], data.body['zone'])
+        end
+
+        def disassociate
+          return nil if !in_use? || self.users.nil? || self.users.empty?
+
+          # An address can only be associated with one server at a time
+          server = service.servers.get(self.users.first.split('/')[-1])
+          nic = server.network_interfaces.first['name']
+          unless server.network_interfaces.first['accessConfigs'].nil? ||
+                 server.network_interfaces.first['accessConfigs'].empty?
+            access_config = server.network_interfaces.first['accessConfigs'].first['name']
+            data = service.delete_server_access_config(server.name, server.zone_name, nic,
+                                                       :access_config => access_config)
+            Fog::Compute::Google::Operations.new(:service => service).get(data.body['name'], data.body['zone'])
+          end
+        end
       end
 
     end

lib/fog/google/models/compute/addresses.rb

@@ -27,6 +27,14 @@ module Fog
         rescue Fog::Errors::NotFound
           nil
         end
+
+        def get_by_ip_address(ip_address)
+          addresses = service.list_aggregated_addresses(:filter => "address eq .*#{ip_address}").body['items']
+          address = addresses.each_value.select { |region| region.has_key?('addresses') }
+
+          return nil if address.empty?
+          new(address.first['addresses'].first)
+        end
       end
 
     end

lib/fog/google/models/compute/server.rb

@@ -105,6 +105,10 @@ module Fog
           ip
         end
 
+        def addresses
+          [private_ip_address, public_ip_address]
+        end
+
         def attach_disk(disk, options = {})
           requires :identity, :zone
 

lib/fog/google/requests/compute/list_aggregated_addresses.rb

@@ -3,17 +3,18 @@ module Fog
     class Google
 
       class Mock
-        def list_aggregated_addresses
+        def list_aggregated_addresses(options = {})
           Fog::Mock.not_implemented
         end
       end
 
       class Real
-        def list_aggregated_addresses
+        def list_aggregated_addresses(options = {})
           api_method = @compute.addresses.aggregated_list
           parameters = {
             'project' => @project,
           }
+          parameters['filter'] = options[:filter] if options[:filter]
 
           result = self.build_result(api_method, parameters)
           response = self.build_response(result)