Add list vnf instance API

Implemented list vnf instances API.

* GET /vnflcm/v1/vnf_instances

Co-authored-By: Ajay Parja <ajay.parja@nttdata.com>
Co-authored-By: Shubham Potale <shubham.potale@nttdata.com>

Change-Id: I1f5d9110e857111232a4ffd4b9c4b229c03a46f8
Blueprint: support-etsi-nfv-specs

tacker/api/views/vnf_lcm.py

@@ -69,3 +69,7 @@ class ViewBuilder(object):
 
     def show(self, vnf_instance):
         return self._get_vnf_instance_info(vnf_instance)
+
+    def index(self, vnf_instances):
+        return [self._get_vnf_instance_info(vnf_instance)
+                for vnf_instance in vnf_instances]

tacker/api/vnflcm/v1/controller.py

@@ -202,8 +202,12 @@ class VnfLcmController(wsgi.Controller):
 
         return self._view_builder.show(vnf_instance)
 
+    @wsgi.response(http_client.OK)
+    @wsgi.expected_errors((http_client.FORBIDDEN))
     def index(self, request):
-        raise webob.exc.HTTPNotImplemented()
+        context = request.environ['tacker.context']
+        vnf_instances = objects.VnfInstanceList.get_all(context)
+        return self._view_builder.index(vnf_instances)
 
     def delete(self, request, id):
         raise webob.exc.HTTPNotImplemented()

tacker/policies/vnf_lcm.py

@@ -76,7 +76,18 @@ rules = [
                 'path': '/vnflcm/v1/vnf_instances/{vnfInstanceId}/heal'
             }
         ]
-    )
+    ),
+    policy.DocumentedRuleDefault(
+        name=VNFLCM % 'index',
+        check_str=base.RULE_ADMIN_OR_OWNER,
+        description="Query VNF instances.",
+        operations=[
+            {
+                'method': 'GET',
+                'path': '/vnflcm/v1/vnf_instances'
+            }
+        ]
+    ),
 ]
 
 

tacker/tests/unit/vnflcm/test_controller.py

@@ -972,3 +972,35 @@ class TestController(base.TestCase):
                     expected_type=expected_type))
 
         self.assertEqual(expected_message, exception.msg)
+
+    @mock.patch.object(objects.VnfInstanceList, "get_all")
+    def test_index(self, mock_vnf_list):
+        req = fake_request.HTTPRequest.blank('/vnf_instances')
+        vnf_instance_1 = fakes.return_vnf_instance()
+        vnf_instance_2 = fakes.return_vnf_instance(
+            fields.VnfInstanceState.INSTANTIATED)
+
+        mock_vnf_list.return_value = [vnf_instance_1, vnf_instance_2]
+        resp = self.controller.index(req)
+        expected_result = [fakes.fake_vnf_instance_response(),
+            fakes.fake_vnf_instance_response(
+            fields.VnfInstanceState.INSTANTIATED)]
+        self.assertEqual(expected_result, resp)
+
+    @mock.patch.object(objects.VnfInstanceList, "get_all")
+    def test_index_empty_response(self, mock_vnf_list):
+        req = fake_request.HTTPRequest.blank('/vnf_instances')
+
+        mock_vnf_list.return_value = []
+        resp = self.controller.index(req)
+        self.assertEqual([], resp)
+
+    @ddt.data('HEAD', 'PUT', 'DELETE', 'PATCH')
+    def test_index_invalid_http_method(self, method):
+        # Wrong HTTP method
+        req = fake_request.HTTPRequest.blank(
+            '/vnf_instances')
+        req.headers['Content-Type'] = 'application/json'
+        req.method = method
+        resp = req.get_response(self.app)
+        self.assertEqual(http_client.METHOD_NOT_ALLOWED, resp.status_code)

tacker/wsgi.py

@@ -1043,8 +1043,8 @@ class Resource(Application):
 
         if not response:
             resp_obj = None
-            if isinstance(action_result, (dict, str)) \
-                    or action_result is None:
+            if (isinstance(action_result, (dict, list, str)) or
+                    action_result is None):
                 resp_obj = ResponseObject(action_result)
             elif isinstance(action_result, ResponseObject):
                 resp_obj = action_result