Add simple os-api extension cli extension

Add a useful extension that will show you what
openstack api extensions are available for usage
and print out the result into a nice little table.

Useful as a example for others to base contrib/
extensions off of.

Example @ http://paste.openstack.org/show/20989/

Change-Id: I5b72f5ea73c00f1c1a0f09f670d744c820e05837

novaclient/v1_1/contrib/list_extensions.py

@@ -0,0 +1,46 @@
+# Copyright 2011 OpenStack LLC.
+# All Rights Reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+from novaclient import base
+from novaclient import utils
+
+
+class ListExtResource(base.Resource):
+    @property
+    def summary(self):
+        descr = self.description.strip()
+        if not descr:
+            return '??'
+        lines = descr.split("\n")
+        if len(lines) == 1:
+            return lines[0]
+        else:
+            return lines[0] + "..."
+
+
+class ListExtManager(base.Manager):
+    resource_class = ListExtResource
+
+    def show_all(self):
+        return self._list("/extensions", 'extensions')
+
+
+def do_list_extensions(client, _args):
+    """
+    List all the os-api extensions that are available.
+    """
+    extensions = client.list_extensions.show_all()
+    fields = ["Name", "Summary", "Alias", "Updated"]
+    utils.print_list(extensions, fields)

tests/v1_1/contrib/test_list_extensions.py

@@ -0,0 +1,21 @@
+from novaclient import extension
+from novaclient.v1_1.contrib import list_extensions
+
+from tests import utils
+from tests.v1_1 import fakes
+
+
+extensions = [
+    extension.Extension(list_extensions.__name__.split(".")[-1],
+                        list_extensions),
+]
+cs = fakes.FakeClient(extensions=extensions)
+
+
+class ListExtensionsTests(utils.TestCase):
+    def test_list_extensions(self):
+        all_exts = cs.list_extensions.show_all()
+        cs.assert_called('GET', '/extensions')
+        self.assertTrue(len(all_exts) > 0)
+        for r in all_exts:
+            self.assertTrue(len(r.summary) > 0)

tests/v1_1/fakes.py

@@ -25,7 +25,8 @@ class FakeClient(fakes.FakeClient, client.Client):
 
     def __init__(self, *args, **kwargs):
         client.Client.__init__(self, 'username', 'password',
-                               'project_id', 'auth_url')
+                               'project_id', 'auth_url',
+                               extensions=kwargs.get('extensions'))
         self.client = FakeHTTPClient(**kwargs)
 
 
@@ -67,6 +68,53 @@ class FakeHTTPClient(base_client.HTTPClient):
         else:
             return httplib2.Response({"status": status}), body
 
+    #
+    # List all extensions
+    #
+
+    def get_extensions(self, **kw):
+        exts = [
+            {
+                "alias": "NMN",
+                "description": "Multiple network support",
+                "links": [],
+                "name": "Multinic",
+                "namespace": ("http://docs.openstack.org/"
+                              "compute/ext/multinic/api/v1.1"),
+                "updated": "2011-06-09T00:00:00+00:00"
+            },
+            {
+                "alias": "OS-DCF",
+                "description": "Disk Management Extension",
+                "links": [],
+                "name": "DiskConfig",
+                "namespace": ("http://docs.openstack.org/"
+                              "compute/ext/disk_config/api/v1.1"),
+                "updated": "2011-09-27T00:00:00+00:00"
+            },
+            {
+                "alias": "OS-EXT-SRV-ATTR",
+                "description": "Extended Server Attributes support.",
+                "links": [],
+                "name": "ExtendedServerAttributes",
+                "namespace": ("http://docs.openstack.org/"
+                              "compute/ext/extended_status/api/v1.1"),
+                "updated": "2011-11-03T00:00:00+00:00"
+            },
+            {
+                "alias": "OS-EXT-STS",
+                "description": "Extended Status support",
+                "links": [],
+                "name": "ExtendedStatus",
+                "namespace": ("http://docs.openstack.org/"
+                              "compute/ext/extended_status/api/v1.1"),
+                "updated": "2011-11-03T00:00:00+00:00"
+            },
+        ]
+        return (200, {
+            "extensions": exts,
+        })
+
     #
     # Limits
     #