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# Copyright 2022-2024 ETSI OSG/SDG TeraFlowSDN (TFS) (https://tfs.etsi.org/)
#
# 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.
# See the License for the specific language governing permissions and
# limitations under the License.
import copy, json, libyang, logging, os
from typing import Dict, List, Optional
LOGGER = logging.getLogger(__name__)
YANG_DIR = os.path.join(os.path.dirname(__file__), 'yang')
YANG_MODULES = [
'ietf-yang-types',
'ietf-interfaces',
'iana-if-type',
'ietf-access-control-list',
]
class YangValidator:
def __init__(self) -> None:
self._yang_context = libyang.Context(YANG_DIR)
for module_name in YANG_MODULES:
LOGGER.info('Loading module: {:s}'.format(str(module_name)))
yang_module = self._yang_context.load_module(module_name)
yang_module.feature_enable_all()
yang_module_prefix = yang_module.prefix()
LOGGER.info(' Prefix: {:s}'.format(str(yang_module_prefix)))
def parse_to_dict(self, message : Dict, interface_names : List[str]) -> Dict:
interfaces = self._yang_context.create_data_path('/ietf-interfaces:interfaces')
for if_index,interface_name in enumerate(interface_names):
if_path = 'interface[name="{:s}"]'.format(str(interface_name))
interface = interfaces.create_path(if_path)
interface.create_path('if-index', if_index + 1)
interface.create_path('type', 'iana-if-type:ethernetCsmacd')
interface.create_path('admin-status', 'up')
interface.create_path('oper-status', 'up')
statistics = interface.create_path('statistics')
statistics.create_path('discontinuity-time', '2024-07-11T10:00:00.000000Z')
message = copy.deepcopy(message)
message['ietf-interfaces:interfaces'] = interfaces.print_dict()['interfaces']
dnode : Optional[libyang.DNode] = self._yang_context.parse_data_mem(
json.dumps(message), 'json', validate_present=True, strict=True
)
if dnode is None: raise Exception('Unable to parse Message({:s})'.format(str(message)))
message = dnode.print_dict()
dnode.free()
interfaces.free()
return message
def destroy(self) -> None:
self._yang_context.destroy()
self._yang_context = None
def main() -> None:
import uuid # pylint: disable=import-outside-toplevel
logging.basicConfig(level=logging.DEBUG)
interface_names = {'200', '500', str(uuid.uuid4()), str(uuid.uuid4())}
ACL_RULE = {"ietf-access-control-list:acls": {
"acl": [{
"name": "sample-ipv4-acl", "type": "ipv4-acl-type",
"aces": {"ace": [{
"name": "rule1",
"matches": {
"ipv4": {
"source-ipv4-network": "128.32.10.6/24",
"destination-ipv4-network": "172.10.33.0/24",
"dscp": 18
},
"tcp": {
"source-port": {"operator": "eq", "port": 1444},
"destination-port": {"operator": "eq", "port": 1333},
"flags": "syn"
}
},
"actions": {"forwarding": "drop"}
}]}
}],
"attachment-points": {"interface": [{
"interface-id": "200",
"ingress": {"acl-sets": {"acl-set": [{"name": "sample-ipv4-acl"}]}}
}]
}}}
yang_validator = YangValidator()
request_data = yang_validator.parse_to_dict(ACL_RULE, list(interface_names))
yang_validator.destroy()
LOGGER.info('request_data = {:s}'.format(str(request_data)))
if __name__ == '__main__':
main()