Add refresh facts.

pyntc/devices/nxos_device.py

@@ -58,10 +58,7 @@ def _image_booted(self, image_name, **vendor_specifics):
     def _wait_for_device_reboot(self, timeout=3600):
         start = time.time()
         while time.time() - start < timeout:
-            # Clear cache
-            self._uptime = None
-            delattr(self.native, "_facts")
-
+            self.refresh()
             try:  # NXOS stays online, when it installs OS
                 if self.uptime < 180:
                     log.debug("Host %s: Device rebooted.", self.host)
@@ -72,6 +69,11 @@ def _wait_for_device_reboot(self, timeout=3600):
         log.error("Host %s: Device timed out while rebooting.", self.host)
         raise RebootTimeoutError(hostname=self.hostname, wait_time=timeout)
 
+    def refresh(self):
+        """Refresh caches on device instance."""
+        delattr(self.native, "_facts")
+        super().refresh()
+
     def backup_running_config(self, filename):
         """Backup running configuration.
 
@@ -142,6 +144,18 @@ def uptime(self):
         log.debug("Host %s: Uptime %s", self.host, self._uptime)
         return self._uptime
 
+    @property
+    def uptime_string(self):
+        """Get uptime in format dd:hh:mm.
+
+        Returns:
+            str: Uptime of device.
+        """
+        if self._uptime_string is None:
+            self._uptime_string = self.native.facts.get("uptime_string")
+
+        return self._uptime_string
+
     @property
     def hostname(self):
         """Get hostname of the device.

tests/unit/test_devices/test_nxos_device.py

@@ -250,6 +250,12 @@ def test_starting_config(self):
         expected = self.device.show("show startup-config", raw_text=True)
         self.assertEqual(self.device.startup_config, expected)
 
+    def test_refresh(self):
+        self.assertTrue(hasattr(self.device.native, "_facts"))
+        self.device.refresh()
+        self.assertIsNone(self.device._uptime)
+        self.assertFalse(hasattr(self.device.native, "_facts"))
+
 
 if __name__ == "__main__":
     unittest.main()