configdict.py
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configdict.py
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	# Copyright 2019 VyOS maintainers and contributors <maintainers@vyos.io>
	#
	# This library is free software; you can redistribute it and/or
	# modify it under the terms of the GNU Lesser General Public
	# License as published by the Free Software Foundation; either
	# version 2.1 of the License, or (at your option) any later version.
	#
	# This library is distributed in the hope that it will be useful,
	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	# Lesser General Public License for more details.
	#
	# You should have received a copy of the GNU Lesser General Public
	# License along with this library. If not, see <http://www.gnu.org/licenses/>.

	"""
	A library for retrieving value dicts from VyOS configs in a declarative fashion.

	"""
	import jmespath

	from enum import Enum
	from copy import deepcopy

	from vyos import ConfigError
	from vyos.validate import is_member
	from vyos.util import ifname_from_config

	def retrieve_config(path_hash, base_path, config):
	"""
	Retrieves a VyOS config as a dict according to a declarative description

	The description dict, passed in the first argument, must follow this format:
	``field_name : <path, type, [inner_options_dict]>``.

	Supported types are: ``str`` (for normal nodes),
	``list`` (returns a list of strings, for multi nodes),
	``bool`` (returns True if valueless node exists),
	``dict`` (for tag nodes, returns a dict indexed by node names,
	according to description in the third item of the tuple).

	Args:
	path_hash (dict): Declarative description of the config to retrieve
	base_path (list): A base path to prepend to all option paths
	config (vyos.config.Config): A VyOS config object

	Returns:
	dict: config dict
	"""
	config_hash = {}

	for k in path_hash:

	if type(path_hash[k]) != tuple:
	raise ValueError("In field {0}: expected a tuple, got a value {1}".format(k, str(path_hash[k])))
	if len(path_hash[k]) < 2:
	raise ValueError("In field {0}: field description must be a tuple of at least two items, path (list) and type".format(k))

	path = path_hash[k][0]
	if type(path) != list:
	raise ValueError("In field {0}: path must be a list, not a {1}".format(k, type(path)))

	typ = path_hash[k][1]
	if type(typ) != type:
	raise ValueError("In field {0}: type must be a type, not a {1}".format(k, type(typ)))

	path = base_path + path

	path_str = " ".join(path)

	if typ == str:
	config_hash[k] = config.return_value(path_str)
	elif typ == list:
	config_hash[k] = config.return_values(path_str)
	elif typ == bool:
	config_hash[k] = config.exists(path_str)
	elif typ == dict:
	try:
	inner_hash = path_hash[k][2]
	except IndexError:
	raise ValueError("The type of the \'{0}\' field is dict, but inner options hash is missing from the tuple".format(k))
	config_hash[k] = {}
	nodes = config.list_nodes(path_str)
	for node in nodes:
	config_hash[k][node] = retrieve_config(inner_hash, path + [node], config)

	return config_hash


	def dict_merge(source, destination):
	""" Merge two dictionaries. Only keys which are not present in destination
	will be copied from source, anything else will be kept untouched. Function
	will return a new dict which has the merged key/value pairs. """
	from copy import deepcopy
	tmp = deepcopy(destination)

	for key, value in source.items():
	if key not in tmp.keys():
	tmp[key] = value
	elif isinstance(source[key], dict):
	tmp[key] = dict_merge(source[key], tmp[key])

	return tmp

	def list_diff(first, second):
	""" Diff two dictionaries and return only unique items """
	second = set(second)
	return [item for item in first if item not in second]

	def T2665_default_dict_cleanup(dict):
	""" Cleanup default keys for tag nodes https://phabricator.vyos.net/T2665. """
	# Cleanup
	for vif in ['vif', 'vif_s']:
	if vif in dict.keys():
	for key in ['ip', 'mtu']:
	if key in dict[vif].keys():
	del dict[vif][key]

	# cleanup VIF-S defaults
	if 'vif_c' in dict[vif].keys():
	for key in ['ip', 'mtu']:
	if key in dict[vif]['vif_c'].keys():
	del dict[vif]['vif_c'][key]
	# If there is no vif-c defined and we just cleaned the default
	# keys - we can clean the entire vif-c dict as it's useless
	if not dict[vif]['vif_c']:
	del dict[vif]['vif_c']

	# If there is no real vif/vif-s defined and we just cleaned the default
	# keys - we can clean the entire vif dict as it's useless
	if not dict[vif]:
	del dict[vif]

	return dict

	def leaf_node_changed(conf, path):
	"""
	Check if a leaf node was altered. If it has been altered - values has been
	changed, or it was added/removed, we will return the old value. If nothing
	has been changed, None is returned
	"""
	from vyos.configdiff import get_config_diff
	D = get_config_diff(conf, key_mangling=('-', '_'))
	D.set_level(conf.get_level())
	(new, old) = D.get_value_diff(path)
	if new != old:
	if isinstance(old, str):
	return old
	elif isinstance(old, list):
	if isinstance(new, str):
	new = [new]
	elif isinstance(new, type(None)):
	new = []
	return list_diff(old, new)

	return None

	def node_changed(conf, path):
	"""
	Check if a leaf node was altered. If it has been altered - values has been
	changed, or it was added/removed, we will return the old value. If nothing
	has been changed, None is returned
	"""
	from vyos.configdiff import get_config_diff, Diff
	D = get_config_diff(conf, key_mangling=('-', '_'))
	D.set_level(conf.get_level())
	# get_child_nodes() will return dict_keys(), mangle this into a list with PEP448
	keys = D.get_child_nodes_diff(path, expand_nodes=Diff.DELETE)['delete'].keys()
	return list(keys)

	def get_removed_vlans(conf, dict):
	"""
	Common function to parse a dictionary retrieved via get_config_dict() and
	determine any added/removed VLAN interfaces - be it 802.1q or Q-in-Q.
	"""
	from vyos.configdiff import get_config_diff, Diff

	# Check vif, vif-s/vif-c VLAN interfaces for removal
	D = get_config_diff(conf, key_mangling=('-', '_'))
	D.set_level(conf.get_level())
	# get_child_nodes() will return dict_keys(), mangle this into a list with PEP448
	keys = D.get_child_nodes_diff(['vif'], expand_nodes=Diff.DELETE)['delete'].keys()
	if keys:
	dict.update({'vif_remove': [*keys]})

	# get_child_nodes() will return dict_keys(), mangle this into a list with PEP448
	keys = D.get_child_nodes_diff(['vif-s'], expand_nodes=Diff.DELETE)['delete'].keys()
	if keys:
	dict.update({'vif_s_remove': [*keys]})

	for vif in dict.get('vif_s', {}).keys():
	keys = D.get_child_nodes_diff(['vif-s', vif, 'vif-c'], expand_nodes=Diff.DELETE)['delete'].keys()
	if keys:
	dict.update({'vif_s': { vif : {'vif_c_remove': [*keys]}}})

	return dict

	def get_interface_dict(config, base, ifname):
	"""
	Common utility function to retrieve and mandgle the interfaces available
	in CLI configuration. All interfaces have a common base ground where the
	value retrival is identical - so it can and should be reused

	Will return a dictionary with the necessary interface configuration
	"""
	from vyos.xml import defaults

	# retrieve interface default values
	default_values = defaults(base)

	# setup config level which is extracted in get_removed_vlans()
	config.set_level(base + [ifname])
	dict = config.get_config_dict([], key_mangling=('-', '_'), get_first_key=True)

	# Check if interface has been removed
	if dict == {}:
	dict.update({'deleted' : ''})

	# Add interface instance name into dictionary
	dict.update({'ifname': ifname})

	# We have gathered the dict representation of the CLI, but there are
	# default options which we need to update into the dictionary
	# retrived.
	dict = dict_merge(default_values, dict)

	# Check if we are a member of a bridge device
	bridge = is_member(config, ifname, 'bridge')
	if bridge:
	dict.update({'is_bridge_member' : bridge})

	# Check if we are a member of a bond device
	bond = is_member(config, ifname, 'bonding')
	if bond:
	dict.update({'is_bond_member' : bond})

	mac = leaf_node_changed(config, ['mac'])
	if mac:
	dict.update({'mac_old' : mac})

	eui64 = leaf_node_changed(config, ['ipv6', 'address', 'eui64'])
	if eui64:
	# XXX: T2636 workaround: convert string to a list with one element
	if isinstance(eui64, str):
	eui64 = [eui64]
	tmp = jmespath.search('ipv6.address', dict)
	if not tmp:
	dict.update({'ipv6': {'address': {'eui64_old': eui64}}})
	else:
	dict['ipv6']['address'].update({'eui64_old': eui64})

	# remove wrongly inserted values
	dict = T2665_default_dict_cleanup(dict)

	# The values are identical for vif, vif-s and vif-c as the all include the same
	# XML definitions which hold the defaults
	default_vif_values = defaults(base + ['vif'])
	for vif, vif_config in dict.get('vif', {}).items():
	vif_config = dict_merge(default_vif_values, vif_config)
	for vif_s, vif_s_config in dict.get('vif_s', {}).items():
	vif_s_config = dict_merge(default_vif_values, vif_s_config)
	for vif_c, vif_c_config in vif_s_config.get('vif_c', {}).items():
	vif_c_config = dict_merge(default_vif_values, vif_c_config)

	# Check vif, vif-s/vif-c VLAN interfaces for removal
	dict = get_removed_vlans(config, dict)

	return dict

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