Update manual network config ux to use network model objects

- Use get_interface method to obtain and Networkdev object
and interact with this.  Validates {add,remove}_subnet methods
on Networkdev objects.
- Add method in model for setting and validating gateway values

Signed-off-by: Ryan Harper <ryan.harper@canonical.com>

subiquity/models/network.py

@@ -46,9 +46,9 @@ class Networkdev():
         log.debug('Info: {}'.format(probe_info))
         self.action = action
         self.probe_info = probe_info
-        self._configure_from_info()
+        self.configure_from_info()
 
-    def _configure_from_info(self):
+    def configure_from_info(self):
         log.debug('configuring netdev from info source')
 
         ip_info = self.probe_info.ip
@@ -170,7 +170,7 @@ class Networkdev():
             if ipaddr is False:
                 raise ValueError(('Invalid IP address ') + address)
 
-            ipnet = self.valid_ipv4_network(network)
+            ipnet = valid_ipv4_network(network)
             if ipnet is False:
                 raise ValueError(('Invalid IP network ') + network)
 
@@ -478,3 +478,10 @@ class NetworkModel(ModelPolicy):
         self.configured_interfaces.update({ifname: BondAction(**action)})
         log.debug("add_bond: {} as BondAction({})".format(
                   ifname, action))
+
+    def set_default_gateway(self, gateway_input):
+        addr = valid_ipv4_address(gateway_input)
+        if addr is False:
+            raise ValueError(('Invalid gateway IP ') + gateway_input)
+
+        self.default_gateway = addr.compressed

subiquity/ui/views/network_configure_ipv4_interface.py

@@ -27,7 +27,8 @@ class NetworkConfigureIPv4InterfaceView(ViewPolicy):
     def __init__(self, model, signal, iface):
         self.model = model
         self.signal = signal
-        self.iface = iface
+        self.ifname = iface
+        self.iface = self.model.get_interface(self.ifname)
         self.gateway_input = StringEditor(caption="")  # FIXME: ipaddr_editor
         self.address_input = StringEditor(caption="")  # FIXME: ipaddr_editor
         self.subnet_input = StringEditor(caption="")  # FIXME: ipaddr_editor
@@ -76,7 +77,7 @@ class NetworkConfigureIPv4InterfaceView(ViewPolicy):
         return Pile(col1)
 
     def _build_set_as_default_gw_button(self):
-        ifaces = self.model.get_interfaces()
+        ifaces = self.model.get_all_interface_names()
         if len(ifaces) > 1:
             btn = menu_btn(label="Set this as default gateway",
                            on_press=self.set_default_gateway)
@@ -86,7 +87,11 @@ class NetworkConfigureIPv4InterfaceView(ViewPolicy):
 
     def set_default_gateway(self, button):
         if self.gateway_input.value:
-            self.model.default_gateway = self.gateway_input.value
+            try:
+                self.model.set_default_gateway(self.gateway_input.value)
+            except ValueError:
+                # FIXME: set error message UX ala identity
+                pass
 
     def _build_buttons(self):
         cancel = cancel_btn(on_press=self.cancel)
@@ -108,11 +113,11 @@ class NetworkConfigureIPv4InterfaceView(ViewPolicy):
             'searchpath': self.searchpath_input.value,
         }
         try:
-            self.model.remove_subnets(self.iface)
-            self.model.add_subnet(self.iface, **result)
+            self.iface.remove_subnets()
+            self.iface.add_subnet(**result)
         except ValueError:
             log.exception('Failed to manually configure interface')
-            self.model.configure_iface_from_info(self.iface)
+            self.iface.configure_from_info()
             # FIXME: set error message in UX ala identity
             return