Add host show CLI

Add host show CLI
I cannot bump the api version to 1.5 as the unit test fail. seem
pecan check the request version to all controller function which
lead to unit test fail.

Change-Id: I4662bde3737b6c0a4c1ea1d51ca67c072f6b3011
Partially-Implements: blueprint show-container-engine-info

setup.cfg

@@ -59,6 +59,7 @@ openstack.container.v1 =
    appcontainer_image_list = zunclient.osc.v1.images:ListImage
    appcontainer_image_pull = zunclient.osc.v1.images:PullImage
    appcontainer_host_list = zunclient.osc.v1.hosts:ListHost
+   appcontainer_host_show = zunclient.osc.v1.hosts:ShowHost
 
 [build_sphinx]
 source-dir = doc/source

zunclient/osc/v1/hosts.py

@@ -16,6 +16,11 @@ from osc_lib.command import command
 from osc_lib import utils
 
 
+def _host_columns(host):
+    del host._info['links']
+    return host._info.keys()
+
+
 def _get_client(obj, parsed_args):
     obj.log.debug("take_action(%s)" % parsed_args)
     return obj.app.client_manager.container
@@ -61,3 +66,25 @@ class ListHost(command.Lister):
         columns = ('uuid', 'hostname', 'mem_total', 'cpus', 'os', 'labels')
         return (columns, (utils.get_item_properties(host, columns)
                           for host in hosts))
+
+
+class ShowHost(command.ShowOne):
+    """Show a host"""
+
+    log = logging.getLogger(__name__ + ".ShowHost")
+
+    def get_parser(self, prog_name):
+        parser = super(ShowHost, self).get_parser(prog_name)
+        parser.add_argument(
+            'host',
+            metavar='<host>',
+            help='ID or name of the host to show.')
+        return parser
+
+    def take_action(self, parsed_args):
+        client = _get_client(self, parsed_args)
+        host = parsed_args.host
+        host = client.hosts.get(host)
+        columns = _host_columns(host)
+
+        return columns, utils.get_item_properties(host, columns)

zunclient/v1/hosts.py

@@ -74,3 +74,9 @@ class HostManager(base.Manager):
             return self._list_pagination(self._path(path),
                                          "hosts",
                                          limit=limit)
+
+    def get(self, id):
+        try:
+            return self._list(self._path(id))[0]
+        except IndexError:
+            return None

zunclient/v1/hosts_shell.py

@@ -10,6 +10,9 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import json
+import yaml
+
 from zunclient.common import cliutils as utils
 from zunclient.common import utils as zun_utils
 
@@ -42,3 +45,25 @@ def do_host_list(cs, args):
     utils.print_list(hosts, columns,
                      {'versions': zun_utils.print_list_field('versions')},
                      sortby_index=None)
+
+
+@utils.arg('host',
+           metavar='<host>',
+           help='ID or name of the host to show.')
+@utils.arg('-f', '--format',
+           metavar='<format>',
+           action='store',
+           choices=['json', 'yaml', 'table'],
+           default='table',
+           help='Print representation of the host.'
+                'The choices of the output format is json,table,yaml.'
+                'Defaults to table.')
+def do_host_show(cs, args):
+    """Show details of a host."""
+    host = cs.hosts.get(args.host)
+    if args.format == 'json':
+        print(json.dumps(host._info, indent=4, sort_keys=True))
+    elif args.format == 'yaml':
+        print(yaml.safe_dump(host._info, default_flow_style=False))
+    elif args.format == 'table':
+        utils.print_dict(host._info)