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ntp.py
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ntp.py
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#
# Copyright (c) 2015, Arista Networks, Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
#
# Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# Neither the name of Arista Networks nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ARISTA NETWORKS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
# BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
# OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
# IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
"""Module for managing the NTP configuration in EOS
This module provides an API for configuring NTP resources using
EOS and eAPI.
Arguments:
name (string): The interface port that specifies the NTP source.
"""
import re
from pyeapi.api import Entity
class Ntp(Entity):
"""The Ntp class implements global NTP router configuration
"""
def __init__(self, *args, **kwargs):
super(Ntp, self).__init__(*args, **kwargs)
def get(self):
"""Returns the current NTP configuration
The Ntp resource returns the following:
* source_interface (str): The interface port that specifies
NTP server
* servers (list): A list of the NTP servers that have been
assigned to the node. Each entry in the
list is a key/value pair of the name of
the server as the key and None or 'prefer'
as the value if the server is preferred.
Returns:
A Python dictionary object of key/value pairs that represents
the current NTP configuration of the node::
{
"source_interface": 'Loopback0',
'servers': [
{ '1.1.1.1': None },
{ '1.1.1.2': 'prefer' },
{ '1.1.1.3': 'prefer' },
{ '1.1.1.4': None },
]
}
"""
config = self.config
if not config:
return None
response = dict()
response.update(self._parse_source_interface(config))
response.update(self._parse_servers(config))
return response
def _parse_source_interface(self, config):
match = re.search(r'^ntp source ([^\s]+)', config, re.M)
value = match.group(1) if match else None
return dict(source_interface=value)
def _parse_servers(self, config):
matches = re.findall(r'ntp server ([\S]+) ?(prefer)?', config, re.M)
value = []
for match in matches:
server = match[0]
prefer = match[1] if match[1] == 'prefer' else None
value.append({server: prefer})
return dict(servers=value)
def create(self, name):
"""Instantiate the NTP by setting the source interface.
Args:
name (string): The interface port that specifies the NTP source.
Returns:
True if the operation succeeds, otherwise False.
"""
return self.set_source_interface(name)
def delete(self):
"""Delete the NTP source entry from the node.
Returns:
True if the operation succeeds, otherwise False.
"""
cmd = self.command_builder('ntp source', disable=True)
return self.configure(cmd)
def default(self):
"""Default the NTP source entry from the node.
Returns:
True if the operation succeeds, otherwise False.
"""
cmd = self.command_builder('ntp source', default=True)
return self.configure(cmd)
def set_source_interface(self, name):
"""Assign the NTP source on the node
Args:
name (string): The interface port that specifies the NTP source.
Returns:
True if the operation succeeds, otherwise False.
"""
cmd = self.command_builder('ntp source', value=name)
return self.configure(cmd)
def add_server(self, name, prefer=False):
"""Add or update an NTP server entry to the node config
Args:
name (string): The IP address or FQDN of the NTP server.
prefer (bool): Sets the NTP server entry as preferred if True.
Returns:
True if the operation succeeds, otherwise False.
"""
if not name or re.match(r'^[\s]+$', name):
raise ValueError('ntp server name must be specified')
if prefer:
name = '%s prefer' % name
cmd = self.command_builder('ntp server', value=name)
return self.configure(cmd)
def remove_server(self, name):
"""Remove an NTP server entry from the node config
Args:
name (string): The IP address or FQDN of the NTP server.
Returns:
True if the operation succeeds, otherwise False.
"""
cmd = self.command_builder('no ntp server', value=name)
return self.configure(cmd)
def remove_all_servers(self):
"""Remove all NTP server entries from the node config
Returns:
True if the operation succeeds, otherwise False.
"""
# 'no ntp' removes all server entries.
# For command_builder, disable command 'ntp' gives the desired command
cmd = self.command_builder('ntp', disable=True)
return self.configure(cmd)
def instance(node):
"""Returns an instance of Ntp
Args:
node (Node): The node argument passes an instance of Node to the
resource
Returns:
object: An instance of Ntp
"""
return Ntp(node)