Add "--vnffgd-template" to vnffg-update command

This patch will add "--vnffgd-template" to vnffg-update command to support
update VNFFG from file. User can run:
    tacker vnffg-update --vnffgd-template <vnffgd-file-name> vnffg_name
to update the existing VNFFG.

Partially Implements: blueprint update-vnffg

Change-Id: Ief0469d870530693798f798ecd2f52782318795b

tackerclient/tacker/v1_0/nfvo/vnffg.py

@@ -165,6 +165,10 @@ class UpdateVNFFG(tackerV10.UpdateCommand):
     resource = _VNFFG
 
     def add_known_arguments(self, parser):
+        parser.add_argument(
+            '--vnffgd-template',
+            help=_('VNFFGD file to update VNFFG')
+        )
         parser.add_argument(
             '--vnf-mapping',
             help=_('List of logical VNFD name to VNF instance name mapping.  '
@@ -176,7 +180,8 @@ class UpdateVNFFG(tackerV10.UpdateCommand):
             help=_('Should a reverse path be created for the NFP'))
 
     def args2body(self, parsed_args):
-        body = {self.resource: {}}
+        args = {}
+        body = {self.resource: args}
 
         tacker_client = self.get_client()
         tacker_client.format = parsed_args.request_format
@@ -192,6 +197,17 @@ class UpdateVNFFG(tackerV10.UpdateCommand):
 
             parsed_args.vnf_mapping = _vnf_mapping
 
+        if parsed_args.vnffgd_template:
+            with open(parsed_args.vnffgd_template) as f:
+                template = f.read()
+            try:
+                args['vnffgd_template'] = yaml.load(
+                    template, Loader=yaml.SafeLoader)
+            except yaml.YAMLError as e:
+                raise exceptions.InvalidInput(e)
+            if not args['vnffgd_template']:
+                raise exceptions.InvalidInput('The vnffgd template is empty')
+
         tackerV10.update_dict(parsed_args, body[self.resource],
                               ['tenant_id', 'vnf_mapping', 'symmetrical'])
         return body

tackerclient/tests/unit/vm/samples/vnffg_update_file.yaml

@@ -0,0 +1 @@
+abcxyz

tackerclient/tests/unit/vm/test_cli10_vnffg.py

@@ -16,6 +16,7 @@
 
 import sys
 
+from tackerclient.common import utils
 from tackerclient.tacker.v1_0.nfvo import vnffg
 from tackerclient.tests.unit import test_cli10
 
@@ -94,11 +95,22 @@ class CLITestV10VmVNFFGJSON(test_cli10.CLITestV10Base):
     def test_update_vnffg(self):
         cmd = vnffg.UpdateVNFFG(test_cli10.MyApp(sys.stdout), None)
         my_id = 'my-id'
-        key = 'new_key'
-        value = 'new-value'
+        update_vnffg = utils.get_file_path(
+            'tests/unit/vm/samples/vnffg_update_file.yaml')
+        vnf_mapping = 'VNFD1:VNF1'
+        args = [
+            my_id,
+            '--vnf-mapping', vnf_mapping,
+            '--vnffgd-template', str(update_vnffg),
+            '--symmetrical'
+        ]
+        extra_fields = {
+            "vnf_mapping": {"VNFD1": "VNF1"},
+            "vnffgd_template": "abcxyz",
+            "symmetrical": True
+        }
         self._test_update_resource(self._RESOURCE, cmd, my_id,
-                                   [my_id, '--%s' % key, value],
-                                   {'symmetrical': False, key: value},
+                                   args, extra_fields,
                                    get_client_called_count=2)
 
     def test_delete_vnffg(self):