NCS live-status get example

foo.py

class Selftest(Action):
    @Action.action
    def cb_action(self, uinfo, name, kp, action_input, action_output):
        out = action_output.somewhere
        with ncs.maapi.single_write_trans('python-state-backbone-interface-write', 'system', db=ncs.OPERATIONAL) as t:
            root = ncs.maagic.get_root(t)
            service = ncs.maagic.get_node(t, kp)

            dev = devices.device[service.interface]
            intf = dev.live_status.interfaces.interface[service.interface]

            # each assignment will generate a NETCONF get request to the device
            # asking for one leaf per request, first tx_bytes, then rx_bytes etc
            out.tx_bytes = intf.tx_bytes
            out.rx_bytes = intf.rx_bytes
            out.tx_packets = intf.tx_packets
            out.rx_packets = intf.rx_packets



class Selftest(Action):
    @Action.action
    def cb_action(self, uinfo, name, kp, action_input, action_output):
        out = action_output.somewhere
        with ncs.maapi.single_write_trans('python-state-backbone-interface-write', 'system', db=ncs.OPERATIONAL) as t:
            root = ncs.maagic.get_root(t)
            service = ncs.maagic.get_node(t, kp)

            dev = devices.device[service.interface]
            # bulk get the whole interface
            # we can use maagic to sort of express the path (this would still
            # lead to a NETCONF request but it's a clean way to express the path
            # (internally you can access it with _path on the maagic node object
            # already today))
            intf_path = dev.live_status.interfaces.interface[service.interface]
            # now ask for a get query, use helper function to generate a content
            # match filter based on a maagic node object (accessing its path)
            intf = dev.get(path_to_content_match(intf_path))
            # the intf object now holds a maagic structure with "cached" data,
            # i.e. trying to access it will not lead to further requests to the device
            # thus the following assignments are super cheap, just copying data
            # from one local object to another
            out.tx_bytes = intf.tx_bytes
            out.rx_bytes = intf.rx_bytes
            out.tx_packets = intf.tx_packets
            out.rx_packets = intf.rx_packets