Add support for setting router gateway

This patch adds the support to set the gateway information
for a router.

Implements: blueprint neutron-client-advanced-router
Partially-Implements: blueprint network-commands-options
Change-Id: Ifb5a4d1965cd7e75c0c8cf2cfb677e0628b699dc
Depends-On: I2bda0dd40afd64b6cecca5f64ef2326bda4fac92

2 files changed, 163 insertions, 7 deletions

diff --git a/openstackclient/network/v2/router.py b/openstackclient/network/v2/router.py
index cbd412b5..bf60cf6f 100644
--- a/openstackclient/network/v2/router.py
+++ b/openstackclient/network/v2/router.py
@@ -473,9 +473,32 @@ class SetRouter(command.Command):
             help=_("Clear high availablability attribute of the router "
                    "(disabled router only)")
         )
-        # TODO(tangchen): Support setting 'external_gateway_info' property in
-        # 'router set' command.
-
+        parser.add_argument(
+            '--external-gateway',
+            metavar="<network>",
+            help=_("External Network used as router's gateway (name or ID)")
+        )
+        parser.add_argument(
+            '--fixed-ip',
+            metavar='subnet=<subnet>,ip-address=<ip-address>',
+            action=parseractions.MultiKeyValueAction,
+            optional_keys=['subnet', 'ip-address'],
+            help=_("Desired IP and/or subnet (name or ID)"
+                   "on external gateway: "
+                   "subnet=<subnet>,ip-address=<ip-address> "
+                   "(repeat option to set multiple fixed IP addresses)")
+        )
+        snat_group = parser.add_mutually_exclusive_group()
+        snat_group.add_argument(
+            '--enable-snat',
+            action='store_true',
+            help=_("Enable Source NAT on external gateway")
+        )
+        snat_group.add_argument(
+            '--disable-snat',
+            action='store_true',
+            help=_("Disable Source NAT on external gateway")
+        )
         return parser
 
     def take_action(self, parsed_args):
@@ -504,7 +527,34 @@ class SetRouter(command.Command):
             for route in parsed_args.routes:
                 route['nexthop'] = route.pop('gateway')
             attrs['routes'] = obj.routes + parsed_args.routes
-
+        if (parsed_args.disable_snat or parsed_args.enable_snat or
+           parsed_args.fixed_ip) and not parsed_args.external_gateway:
+                msg = (_("You must specify '--external-gateway' in order"
+                         "to update the SNAT or fixed-ip values"))
+                raise exceptions.CommandError(msg)
+        if parsed_args.external_gateway:
+            gateway_info = {}
+            network = client.find_network(
+                parsed_args.external_gateway, ignore_missing=False)
+            gateway_info['network_id'] = network.id
+            if parsed_args.disable_snat:
+                gateway_info['enable_snat'] = False
+            if parsed_args.enable_snat:
+                gateway_info['enable_snat'] = True
+            if parsed_args.fixed_ip:
+                ips = []
+                for ip_spec in parsed_args.fixed_ip:
+                    if ip_spec.get('subnet', False):
+                        subnet_name_id = ip_spec.pop('subnet')
+                        if subnet_name_id:
+                            subnet = client.find_subnet(subnet_name_id,
+                                                        ignore_missing=False)
+                            ip_spec['subnet_id'] = subnet.id
+                    if ip_spec.get('ip-address', False):
+                        ip_spec['ip_address'] = ip_spec.pop('ip-address')
+                    ips.append(ip_spec)
+                gateway_info['external_fixed_ips'] = ips
+            attrs['external_gateway_info'] = gateway_info
         client.update_router(obj, **attrs)
 
 
diff --git a/openstackclient/tests/unit/network/v2/test_router.py b/openstackclient/tests/unit/network/v2/test_router.py
index 24984e47..f5f2c325 100644
--- a/openstackclient/tests/unit/network/v2/test_router.py
+++ b/openstackclient/tests/unit/network/v2/test_router.py
@@ -561,17 +561,19 @@ class TestSetRouter(TestRouter):
 
     # The router to set.
     _default_route = {'destination': '10.20.20.0/24', 'nexthop': '10.20.30.1'}
+    _network = network_fakes.FakeNetwork.create_one_network()
+    _subnet = network_fakes.FakeSubnet.create_one_subnet()
     _router = network_fakes.FakeRouter.create_one_router(
         attrs={'routes': [_default_route]}
     )
 
     def setUp(self):
         super(TestSetRouter, self).setUp()
-
+        self.network.router_add_gateway = mock.Mock()
         self.network.update_router = mock.Mock(return_value=None)
-
         self.network.find_router = mock.Mock(return_value=self._router)
-
+        self.network.find_network = mock.Mock(return_value=self._network)
+        self.network.find_subnet = mock.Mock(return_value=self._subnet)
         # Get the command object to test
         self.cmd = router.SetRouter(self.app, self.namespace)
 
@@ -758,6 +760,110 @@ class TestSetRouter(TestRouter):
             self._router, **attrs)
         self.assertIsNone(result)
 
+    def test_wrong_gateway_params(self):
+        arglist = [
+            "--fixed-ip", "subnet='abc'",
+            self._router.id,
+        ]
+        verifylist = [
+            ('fixed_ip', [{'subnet': "'abc'"}]),
+            ('router', self._router.id),
+        ]
+        parsed_args = self.check_parser(self.cmd, arglist, verifylist)
+        self.assertRaises(exceptions.CommandError,
+                          self.cmd.take_action, parsed_args)
+
+    def test_set_gateway_network_only(self):
+        arglist = [
+            "--external-gateway", self._network.id,
+            self._router.id,
+        ]
+        verifylist = [
+            ('external_gateway', self._network.id),
+            ('router', self._router.id),
+        ]
+        parsed_args = self.check_parser(self.cmd, arglist, verifylist)
+
+        result = self.cmd.take_action(parsed_args)
+        self.network.update_router.assert_called_with(
+            self._router, **{'external_gateway_info': {
+                'network_id': self._network.id}})
+        self.assertIsNone(result)
+
+    def test_set_gateway_options_subnet_only(self):
+        arglist = [
+            "--external-gateway", self._network.id,
+            "--fixed-ip", "subnet='abc'",
+            self._router.id,
+            '--enable-snat',
+        ]
+        verifylist = [
+            ('router', self._router.id),
+            ('external_gateway', self._network.id),
+            ('fixed_ip', [{'subnet': "'abc'"}]),
+            ('enable_snat', True),
+        ]
+        parsed_args = self.check_parser(self.cmd, arglist, verifylist)
+
+        result = self.cmd.take_action(parsed_args)
+        self.network.update_router.assert_called_with(
+            self._router, **{'external_gateway_info': {
+                'network_id': self._network.id,
+                'external_fixed_ips': [{
+                    'subnet_id': self._subnet.id, }],
+                'enable_snat': True, }})
+        self.assertIsNone(result)
+
+    def test_set_gateway_option_ipaddress_only(self):
+        arglist = [
+            "--external-gateway", self._network.id,
+            "--fixed-ip", "ip-address=10.0.1.1",
+            self._router.id,
+            '--enable-snat',
+        ]
+        verifylist = [
+            ('router', self._router.id),
+            ('external_gateway', self._network.id),
+            ('fixed_ip', [{'ip-address': "10.0.1.1"}]),
+            ('enable_snat', True),
+        ]
+        parsed_args = self.check_parser(self.cmd, arglist, verifylist)
+
+        result = self.cmd.take_action(parsed_args)
+        self.network.update_router.assert_called_with(
+            self._router, **{'external_gateway_info': {
+                'network_id': self._network.id,
+                'external_fixed_ips': [{
+                    'ip_address': "10.0.1.1", }],
+                'enable_snat': True, }})
+        self.assertIsNone(result)
+
+    def test_set_gateway_options_subnet_ipaddress(self):
+        arglist = [
+            "--external-gateway", self._network.id,
+            "--fixed-ip", "subnet='abc',ip-address=10.0.1.1",
+            self._router.id,
+            '--enable-snat',
+        ]
+        verifylist = [
+            ('router', self._router.id),
+            ('external_gateway', self._network.id),
+            ('fixed_ip', [{'subnet': "'abc'",
+                           'ip-address': "10.0.1.1"}]),
+            ('enable_snat', True),
+        ]
+        parsed_args = self.check_parser(self.cmd, arglist, verifylist)
+
+        result = self.cmd.take_action(parsed_args)
+        self.network.update_router.assert_called_with(
+            self._router, **{'external_gateway_info': {
+                'network_id': self._network.id,
+                'external_fixed_ips': [{
+                    'subnet_id': self._subnet.id,
+                    'ip_address': "10.0.1.1", }],
+                'enable_snat': True, }})
+        self.assertIsNone(result)
+
 
 class TestShowRouter(TestRouter):