Add command for Fetch VNF package API

Added command support for downloading csar vnf package contents.

Change-Id: I6371ebdf0dd9d127ca88bcd721a31036d11ea5fc
Implements: bp enhance-vnf-package-support-part1

tackerclient/osc/v1/vnfpkgm/vnf_package.py

@@ -260,7 +260,8 @@ class DeleteVnfPackage(command.Command):
 
 
 class DownloadVnfPackage(command.Command):
-    _description = _("Read VNFD of an on-boarded VNF Package")
+    _description = _("Download VNF package contents or VNFD of an on-boarded "
+                     "VNF package.")
 
     def get_parser(self, prog_name):
         parser = super(DownloadVnfPackage, self).get_parser(prog_name)
@@ -272,9 +273,9 @@ class DownloadVnfPackage(command.Command):
         parser.add_argument(
             "--file",
             metavar="<FILE>",
-            help=_("Local file to save downloaded vnfd data. "
+            help=_("Local file to save downloaded VNF Package or VNFD data. "
                    "If this is not specified and there is no redirection "
-                   "then vnfd data will not be saved.")
+                   "then data will not be saved.")
         )
         parser.add_argument(
             "--vnfd",
@@ -308,15 +309,13 @@ class DownloadVnfPackage(command.Command):
             body = client.download_vnfd_from_vnf_package(
                 parsed_args.vnf_package, parsed_args.type)
 
-            if parsed_args.file:
-                sdk_utils.save_data(body, parsed_args.file)
-            else:
+            if not parsed_args.file:
                 print(body)
-
+                return
         else:
-            msg = ("Currently only download vnfd from on-boarded vnf package "
-                   "is supported. use --vnfd")
-            sdk_utils.exit(msg)
+            body = client.download_vnf_package(parsed_args.vnf_package)
+
+        sdk_utils.save_data(body, parsed_args.file)
 
 
 class UpdateVnfPackage(command.ShowOne):

tackerclient/tests/unit/osc/v1/test_vnf_package.py

@@ -560,3 +560,37 @@ class TestDownloadVnfPackage(TestVnfPackage):
             self.assertRaises(SystemExit,
                               self.download_vnf_package.take_action,
                               parsed_args)
+
+    def test_download_vnf_package(self):
+        file_name = 'vnf_package_data.zip'
+        test_file, temp_dir = _create_zip()
+
+        # file in which VNF Package data will be stored.
+        # for testing purpose we are creating temporary zip file.
+        local_file = tempfile.NamedTemporaryFile(suffix=file_name)
+        vnf_package_data = open(test_file, 'rb').read()
+
+        arglist = [
+            self._vnf_package['id'],
+            '--file', local_file.name
+        ]
+        verifylist = [
+            ('vnf_package', self._vnf_package['id']),
+            ('file', local_file.name)
+        ]
+
+        parsed_args = self.check_parser(self.download_vnf_package, arglist,
+                                        verifylist)
+
+        url = os.path.join(self.url, '/vnfpkgm/v1/vnf_packages',
+                           self._vnf_package['id'], 'package_content')
+
+        self.requests_mock.register_uri(
+            'GET', url, headers={'content-type': 'application/zip'},
+            content=vnf_package_data)
+
+        self.download_vnf_package.take_action(parsed_args)
+        self.assertTrue(filecmp.cmp(test_file, local_file.name),
+                        "Downloaded contents don't match test file")
+        self.assertTrue(self._check_valid_zip_file(local_file.name))
+        shutil.rmtree(temp_dir)

tackerclient/v1_0/client.py

@@ -754,6 +754,7 @@ class VnfPackageClient(ClientBase):
     vnfpackages_path = '/vnfpkgm/v1/vnf_packages'
     vnfpackage_path = '/vnfpkgm/v1/vnf_packages/%s'
     vnfpackage_vnfd_path = '/vnfpkgm/v1/vnf_packages/%s/vnfd'
+    vnfpackage_download_path = '/vnfpkgm/v1/vnf_packages/%s/package_content'
 
     def build_action(self, action):
         return action
@@ -794,6 +795,11 @@ class VnfPackageClient(ClientBase):
                 base_path=self.vnfpackages_path),
                 body=file_data)
 
+    @APIParamsCall
+    def download_vnf_package(self, vnf_package):
+        self.format = 'zip'
+        return self.get(self.vnfpackage_download_path % vnf_package)
+
     @APIParamsCall
     def download_vnfd_from_vnf_package(self, vnf_package, accept):
         """Read VNFD of an on-boarded VNF Package.
@@ -1148,3 +1154,6 @@ class Client(object):
     def download_vnfd_from_vnf_package(self, vnf_package, accept):
         return self.vnf_package_client.download_vnfd_from_vnf_package(
             vnf_package, accept)
+
+    def download_vnf_package(self, vnf_package):
+        return self.vnf_package_client.download_vnf_package(vnf_package)