Add 'fuel2 graph delete' command

Currently Nailgun supports DELETE deployment graph operation
3d1f96e529c62b34877216411fc7545b84666d4b. However
python-fuelclient doesn't implement this feature. This patch
adds 'fuel2 graph delete' command to support deployment graph
removal process:

 fuel2 graph delete [-h] (-e ENV | -r RELEASE | -p PLUGIN)
                    -t GRAPH_TYPE

DocImpact
Closes-Bug: 1624918

Change-Id: If49d4f10d404edbd04bb9f1a976b36de1cb1dcfe

fuelclient/commands/graph.py

@@ -352,3 +352,53 @@ class GraphList(base.BaseListCommand):
         scolumn_ids = [self.columns.index(col) for col in args.sort_columns]
         data.sort(key=lambda x: [x[scolumn_id] for scolumn_id in scolumn_ids])
         return self.columns, data
+
+
+class GraphDelete(base.BaseCommand):
+    """Delete deployment graph."""
+    entity_name = 'graph'
+
+    def get_parser(self, prog_name):
+        parser = super(GraphDelete, self).get_parser(prog_name)
+        graph_class = parser.add_mutually_exclusive_group(required=True)
+        graph_class.add_argument('-e',
+                                 '--environment',
+                                 type=int,
+                                 help='Id of the environment')
+        graph_class.add_argument('-r',
+                                 '--release',
+                                 type=int,
+                                 help='Id of the release')
+        graph_class.add_argument('-p',
+                                 '--plugin',
+                                 type=int,
+                                 help='Id of the plugin')
+        parser.add_argument('-t',
+                            '--graph-type',
+                            required=True,
+                            help='Type of the deployment graph')
+        return parser
+
+    def take_action(self, parsed_args):
+        parameters_to_graph_class = (
+            ('environment', 'clusters'),
+            ('release', 'releases'),
+            ('plugin', 'plugins'),
+        )
+
+        msg = ''
+        for parameter, graph_class in parameters_to_graph_class:
+            model_id = getattr(parsed_args, parameter)
+            if model_id:
+                self.client.delete(
+                    related_model=graph_class,
+                    related_id=model_id,
+                    graph_type=parsed_args.graph_type
+                )
+                msg = ("Deployment graph '{0}' for {1} with id {2} was "
+                       "deleted.\n".format(parsed_args.graph_type,
+                                           parameter,
+                                           model_id))
+                break
+
+        self.app.stdout.write(msg)

fuelclient/tests/unit/v2/cli/test_deployment_graph.py

@@ -327,3 +327,14 @@ class TestGraphActions(test_engine.BaseCLITest):
                 mock.call(env_id=None, filters=['cluster']),
                 mock.call(env_id=None, filters=None)
             ])
+
+    def test_delete(self):
+        self._test_cmd(
+            'delete',
+            '--env 1 --graph-type custom_graph',
+            dict(
+                graph_type='custom_graph',
+                related_id=1,
+                related_model='clusters'
+            )
+        )

fuelclient/tests/unit/v2/lib/test_deployment_graph.py

@@ -330,3 +330,13 @@ class TestDeploymentGraphFacade(test_api.BaseLibTest):
         self.client.download(env_id=1, level='cluster',
                              graph_type='custom_graph')
         self.assertTrue(matcher_get.called)
+
+    def test_graph_delete(self):
+        matcher_delete = self.m_request.delete(
+            '/api/v1/clusters/1/deployment_graphs/custom_graph',
+            json={}
+        )
+        self.client.delete(graph_type='custom_graph',
+                           related_id=1,
+                           related_model='clusters')
+        self.assertTrue(matcher_delete.called)

fuelclient/v1/graph.py

@@ -266,6 +266,12 @@ class GraphClient(base_v1.BaseV1Client):
 
         return graphs_list
 
+    def delete(self, related_model, related_id, graph_type):
+        return self.connection.delete_request(
+            self.related_graph_api_path.format(related_model=related_model,
+                                               related_model_id=related_id,
+                                               graph_type=graph_type))
+
 
 def get_client(connection):
     return GraphClient(connection)

setup.cfg

@@ -61,6 +61,7 @@ fuelclient =
     env_update=fuelclient.commands.environment:EnvUpdate
     extension_list=fuelclient.commands.extension:ExtensionList
     fuel-version=fuelclient.commands.fuelversion:FuelVersion
+    graph_delete=fuelclient.commands.graph:GraphDelete
     graph_download=fuelclient.commands.graph:GraphDownload
     graph_execute=fuelclient.commands.graph:GraphExecute
     graph_list=fuelclient.commands.graph:GraphList