Add compute support server backup operation

Implements: blueprint add-compute-backup

Change-Id: I8349cc5a16f39caa1d68db88b89313cf4d3ed416
Signed-off-by: Yuanbin.Chen <cybing4@gmail.com>

doc/source/users/proxies/compute.rst

@@ -29,6 +29,7 @@ Server Operations
    .. automethod:: openstack.compute.v2._proxy.Proxy.delete_server_metadata
    .. automethod:: openstack.compute.v2._proxy.Proxy.wait_for_server
    .. automethod:: openstack.compute.v2._proxy.Proxy.create_server_image
+   .. automethod:: openstack.compute.v2._proxy.Proxy.backup_server
 
 Network Actions
 ***************

openstack/compute/v2/_proxy.py

@@ -620,6 +620,22 @@ class Proxy(proxy2.BaseProxy):
         server = self._get_resource(_server.Server, server)
         server.remove_floating_ip(self._session, address)
 
+    def backup_server(self, server, name, backup_type, rotation):
+        """Backup a server
+
+        :param server: Either the ID of a server or a
+                       :class:`~openstack.compute.v2.server.Server` instance.
+        :param name: The name of the backup image.
+        :param backup_type: The type of the backup, for example, daily.
+        :param rotation: The rotation of the back up image, the oldest
+                         image will be removed when image count exceed
+                         the rotation count.
+
+        :returns: None
+        """
+        server = self._get_resource(_server.Server, server)
+        server.backup(self._session, name, backup_type, rotation)
+
     def pause_server(self, server):
         """Pauses a server and changes its status to ``PAUSED``.
 

openstack/compute/v2/server.py

@@ -274,6 +274,16 @@ class Server(resource2.Resource, metadata.MetadataMixin):
         body = {"removeFloatingIp": {"address": address}}
         self._action(session, body)
 
+    def backup(self, session, name, backup_type, rotation):
+        body = {
+            "createBackup": {
+                "name": name,
+                "backup_type": backup_type,
+                "rotation": rotation
+            }
+        }
+        self._action(session, body)
+
     def pause(self, session):
         body = {"pause": None}
         self._action(session, body)

openstack/tests/unit/compute/v2/test_proxy.py

@@ -318,6 +318,12 @@ class TestComputeProxy(test_proxy_base2.TestProxyBase):
                      method_args=["value", "address"],
                      expected_args=["address"])
 
+    def test_server_backup(self):
+        self._verify("openstack.compute.v2.server.Server.backup",
+                     self.proxy.backup_server,
+                     method_args=["value", "name", "daily", 1],
+                     expected_args=["name", "daily", 1])
+
     def test_server_pause(self):
         self._verify("openstack.compute.v2.server.Server.pause",
                      self.proxy.pause_server,

openstack/tests/unit/compute/v2/test_server.py

@@ -424,6 +424,19 @@ class TestServer(testtools.TestCase):
         self.sess.post.assert_called_with(
             url, endpoint_filter=sot.service, json=body, headers=headers)
 
+    def test_backup(self):
+        sot = server.Server(**EXAMPLE)
+
+        res = sot.backup(self.sess, "name", "daily", 1)
+
+        self.assertIsNone(res)
+        url = 'servers/IDENTIFIER/action'
+        body = {"createBackup": {"name": "name", "backup_type": "daily",
+                                 "rotation": 1}}
+        headers = {'Accept': ''}
+        self.sess.post.assert_called_with(
+            url, endpoint_filter=sot.service, json=body, headers=headers)
+
     def test_pause(self):
         sot = server.Server(**EXAMPLE)