Add compute support server live migrate operation

Implements: blueprint add-compute-migrate

Change-Id: I16e40a946565a94a1ecff0ad522c7cc79bdb234e
Signed-off-by: Yuanbin.Chen <cybing4@gmail.com>

doc/source/users/proxies/compute.rst

@@ -64,6 +64,7 @@ Starting, Stopping, etc.
    .. automethod:: openstack.compute.v2._proxy.Proxy.evacuate_server
    .. automethod:: openstack.compute.v2._proxy.Proxy.migrate_server
    .. automethod:: openstack.compute.v2._proxy.Proxy.get_server_console_output
+   .. automethod:: openstack.compute.v2._proxy.Proxy.live_migrate_server
 
 Modifying a Server
 ******************

openstack/compute/v2/_proxy.py

@@ -1267,6 +1267,18 @@ class Proxy(proxy2.BaseProxy):
                        :class:`~openstack.compute.v2.server.Server` instance.
         :returns: None
         """
-
         server = self._get_resource(_server.Server, server)
         server.migrate(self._session)
+
+    def live_migrate_server(self, server, host=None, force=False):
+        """Migrate a server from one host to target host
+
+        :param server: Either the ID of a server or a
+                       :class:`~openstack.compute.v2.server.Server` instance.
+        :param host: The host to which to migrate the server
+        :param force: Force a live-migration by not verifying the provided
+                      destination host by the scheduler.
+        :returns: None
+        """
+        server = self._get_resource(_server.Server, server)
+        server.live_migrate(self._session, host, force)

openstack/compute/v2/server.py

@@ -357,6 +357,16 @@ class Server(resource2.Resource, metadata.MetadataMixin):
         resp = self._action(session, body)
         return resp.json()
 
+    def live_migrate(self, session, host, force):
+        body = {
+            "os-migrateLive": {
+                "host": host,
+                "block_migration": "auto",
+                "force": force
+            }
+        }
+        self._action(session, body)
+
 
 class ServerDetail(Server):
     base_path = '/servers/detail'

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

@@ -510,3 +510,9 @@ class TestComputeProxy(test_proxy_base2.TestProxyBase):
                      self.proxy.force_service_down,
                      method_args=["value", "host1", "nova-compute"],
                      expected_args=["host1", "nova-compute"])
+
+    def test_live_migrate_server(self):
+        self._verify('openstack.compute.v2.server.Server.live_migrate',
+                     self.proxy.live_migrate_server,
+                     method_args=["value", "host1", "force"],
+                     expected_args=["host1", "force"])

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

@@ -654,3 +654,22 @@ class TestServer(testtools.TestCase):
         headers = {'Accept': ''}
         self.sess.post.assert_called_with(
             url, endpoint_filter=sot.service, json=body, headers=headers)
+
+    def test_live_migrate(self):
+        sot = server.Server(**EXAMPLE)
+
+        res = sot.live_migrate(self.sess, host='HOST2', force=False)
+
+        self.assertIsNone(res)
+        url = 'servers/IDENTIFIER/action'
+        body = {
+            "os-migrateLive": {
+                "host": 'HOST2',
+                "block_migration": "auto",
+                "force": False
+            }
+        }
+
+        headers = {'Accept': ''}
+        self.sess.post.assert_called_with(
+            url, endpoint_filter=sot.service, json=body, headers=headers)