ncclient:NETCONF Python client

# Copyright 2h009 Shikhar Bhushan

#

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

#

#    http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

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'Locking-related NETCONF operations'

from ncclient.xml_ import *

from rpc import RPC

# TODO:

# should have some way to parse session-id from a lock-denied error, and raise

# a tailored exception

class Lock(RPC):

    "*<lock>* RPC"

    def request(self, target):

        node = new_ele("lock")

        sub_ele(sub_ele(node, "target"), target)

        return self._request(node)

class Unlock(RPC):

    "*<unlock>* RPC"

    def request(self, target):

        node = new_ele("unlock")

        sub_ele(sub_ele(node, "target"), target)

        return self._request(node)

class LockContext:

    """

    A context manager for the :class:`Lock` / :class:`Unlock` pair of RPC's.

    RPC errors are always raised as exceptions.

    Initialise with (:class:`Session <ncclient.transport.Session>`) instance

    and lock target.

    """

    def __init__(self, session, target):

        self.session = session

        self.target = target

    def __enter__(self):

        Lock(self.session).request(self.target)

        return self

    def __exit__(self, *args):

        Unlock(self.session).request(self.target)

        return False