Add the new generic driver

In order to add the support for these specific accelerators,
we propose to improve the generic driver to manage these
devices. We propose to improve the existing GenericDriver.

Change-Id: I9a4fdcfcda3778b87f9bb75df8bdbc136f5bdb66

cyborg/accelerator/drivers/driver.py

@@ -0,0 +1,38 @@
+import abc
+import six
+
+
+@six.add_metaclass(abc.ABCMeta)
+class GenericDriver(object):
+
+    @abc.abstractmethod
+    def discover(self):
+        """Discover a specified accelerator.
+
+        :return: the list of driver device objs
+        """
+        pass
+
+    @abc.abstractmethod
+    def update(self, control_path, image_path):
+        """Update the device firmware with specific image.
+
+        :param control_path: the image update control path of device.
+        :param image_path: The image path of the firmware binary.
+
+        :return: True if update successfully otherwise False
+        """
+        pass
+
+    @abc.abstractmethod
+    def get_stats(self):
+        """Collects device stats.
+
+        It is used to collect information from the device about the device
+        capabilities. Such as performance info like temprature, power, volt,
+        packet_count info.
+
+        :return: The stats info of the device. The format should follow the
+        current Cyborg device-deploy-accelerator model
+        """
+        pass

cyborg/tests/unit/accelerator/drivers/test_driver.py

@@ -0,0 +1,31 @@
+import six
+
+from cyborg.tests import base
+from cyborg.accelerator.drivers.driver import GenericDriver
+
+
+class WellDoneDriver(GenericDriver):
+    def discover(self):
+        pass
+
+    def update(self, control_path, image_path):
+        pass
+
+    def get_stats(self):
+        pass
+
+
+class NotCompleteDriver(GenericDriver):
+    def discover(self):
+        pass
+
+
+class TestGenericDriver(base.TestCase):
+
+    def test_generic_driver(self):
+        driver = WellDoneDriver()
+        # Can't instantiate abstract class NotCompleteDriver with
+        # abstract methods get_stats, update
+        result = self.assertRaises(TypeError, NotCompleteDriver)
+        self.assertIn("Can't instantiate abstract class",
+                      six.text_type(result))