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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.
"""
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

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