Add usage show command

Should show basic usage by project id, if not specified then
use the project id the user is authN'ing with.

Change-Id: I0284a5efd84075b18e1a7117cc9f8f7fecf16274
Closes-Bug: #1400796

openstackclient/compute/v2/usage.py

@@ -20,6 +20,8 @@ import logging
 import sys
 
 from cliff import lister
+from cliff import show
+import six
 
 from openstackclient.common import utils
 
@@ -114,3 +116,75 @@ class ListUsage(lister.Lister):
                         'total_local_gb_usage': lambda x: float("%.2f" % x),
                     },
                 ) for s in usage_list))
+
+
+class ShowUsage(show.ShowOne):
+    """Show resource usage for a single project. """
+
+    log = logging.getLogger(__name__ + ".ShowUsage")
+
+    def get_parser(self, prog_name):
+        parser = super(ShowUsage, self).get_parser(prog_name)
+        parser.add_argument(
+            "--start",
+            metavar="<start>",
+            default=None,
+            help="Usage range start date, ex 2012-01-20"
+                 " (default: 4 weeks ago)."
+        )
+        parser.add_argument(
+            "--end",
+            metavar="<end>",
+            default=None,
+            help="Usage range end date, ex 2012-01-20 (default: tomorrow)."
+        )
+        parser.add_argument(
+            "--project",
+            metavar="<project>",
+            default=None,
+            help="Name or ID of project to show usage for."
+        )
+        return parser
+
+    def take_action(self, parsed_args):
+        self.log.debug("take_action(%s)", parsed_args)
+
+        identity_client = self.app.client_manager.identity
+        compute_client = self.app.client_manager.compute
+        dateformat = "%Y-%m-%d"
+        now = datetime.datetime.utcnow()
+
+        if parsed_args.start:
+            start = datetime.datetime.strptime(parsed_args.start, dateformat)
+        else:
+            start = now - datetime.timedelta(weeks=4)
+
+        if parsed_args.end:
+            end = datetime.datetime.strptime(parsed_args.end, dateformat)
+        else:
+            end = now + datetime.timedelta(days=1)
+
+        if parsed_args.project:
+            project = utils.find_resource(
+                identity_client.projects,
+                parsed_args.project,
+            ).id
+        else:
+            # Get the project from the current auth
+            project = self.app.client_manager.auth_ref.project_id
+
+        usage = compute_client.usage.get(project, start, end)
+
+        if parsed_args.formatter == 'table':
+            sys.stdout.write("Usage from %s to %s on project %s: \n" % (
+                start.strftime(dateformat),
+                end.strftime(dateformat),
+                project
+            ))
+
+        info = {}
+        info['Servers'] = len(usage.server_usages)
+        info['RAM MB-Hours'] = float("%.2f" % usage.total_memory_mb_usage)
+        info['CPU Hours'] = float("%.2f" % usage.total_vcpus_usage)
+        info['Disk GB-Hours'] = float("%.2f" % usage.total_local_gb_usage)
+        return zip(*sorted(six.iteritems(info)))

setup.cfg

@@ -131,6 +131,8 @@ openstack.compute.v2 =
     server_unrescue = openstackclient.compute.v2.server:UnrescueServer
     server_unset = openstackclient.compute.v2.server:UnsetServer
 
+    usage_show = openstackclient.compute.v2.usage:ShowUsage
+
 openstack.identity.v2 =
     catalog_list = openstackclient.identity.v2_0.catalog:ListCatalog
     catalog_show = openstackclient.identity.v2_0.catalog:ShowCatalog