Add functions to list or find nova server instances.

Change-Id: I9ddbacb62c2cfa3148ef310610746c5fa16a4900

tobiko/openstack/nova/__init__.py

@@ -20,6 +20,8 @@ from tobiko.openstack.nova import _hypervisor
 CLIENT_CLASSES = _client.CLIENT_CLASSES
 get_nova_client = _client.get_nova_client
 list_hypervisors = _client.list_hypervisors
+list_servers = _client.list_servers
+find_server = _client.find_server
 nova_client = _client.nova_client
 NovaClientFixture = _client.NovaClientFixture
 find_hypervisor = _client.find_hypervisor

tobiko/openstack/nova/_client.py

@@ -76,6 +76,20 @@ def find_hypervisor(client=None, unique=False, **params):
         return hypervisors.first
 
 
+def list_servers(client=None, **params):
+    client = nova_client(client)
+    servers = client.servers.list()
+    return tobiko.select(servers).with_attributes(**params)
+
+
+def find_server(client=None, unique=False, **params):
+    servers = list_servers(client=client, **params)
+    if unique:
+        return servers.unique
+    else:
+        return servers.first
+
+
 def get_server(server, client=None):
     return nova_client(client).servers.get(server)
 

tobiko/tests/functional/openstack/test_nova.py

@@ -80,6 +80,19 @@ class ClientTest(testtools.TestCase):
                                          length=50)
         self.assertTrue(output)
 
+    def test_list_servers(self):
+        server_id = self.stack.server_id
+        for server in nova.list_servers():
+            if server_id == server.id:
+                break
+        else:
+            self.fail('Server {} not found'.format(server_id))
+
+    def test_find_server(self):
+        server_id = self.stack.server_id
+        server = nova.find_server(id=server_id, unique=True)
+        self.assertEqual(server_id, server.id)
+
 
 class HypervisorTest(testtools.TestCase):