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###
# ============LICENSE_START=======================================================
# Simulator
# ================================================================================
# Copyright (C) 2019 Nokia. All rights reserved.
# ================================================================================
# 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.
# ============LICENSE_END=========================================================
###
import logging
import subprocess
import os
from subprocess import check_output, CalledProcessError
from flask import Flask
from flask_restful import Resource, Api, reqparse
from werkzeug.datastructures import FileStorage
import time
app = Flask(__name__)
api = Api(app)
logger = logging.getLogger("yang-loader")
logger.addHandler(logging.StreamHandler())
KAFKA_BROKER_NAME="kafka1:9092"
KAFKA_TOPIC_NAME="config"
class YangLoaderHelper(object):
@classmethod
def save_file(cls, yang_model_file: FileStorage) -> str:
path = "/tmp/" + yang_model_file.filename
yang_model_file.save(path)
return path
@classmethod
def install_new_model(cls, yang_model_path: str):
logger.info("Installing new model: %s", yang_model_path)
command = "sysrepoctl --install --yang={} --owner=netconf:nogroup --permissions=777" \
.format(yang_model_path)
cls._run_bash_command(command)
@classmethod
def uninstall_a_model(cls, yang_model_name: str):
logger.info("Uninstalling a model: %s", yang_model_name)
command = "sysrepoctl --uninstall --module={}" \
.format(yang_model_name)
cls._run_bash_command(command)
@classmethod
def set_default_configuration(cls, init_conf_path: str, module_name: str):
logger.info("Attempting to set default configuration %s for module %s", init_conf_path, module_name)
command = "sysrepocfg --import={} --datastore=startup --format=xml --level=3 {}" \
.format(init_conf_path, module_name)
cls._run_bash_command(command)
@classmethod
def start_change_listener_for_model(cls, module_name: str):
logger.info("Starting listener for model: %s", module_name)
command = "python /netconf/netopeer_change_saver.py {} {} {}" \
.format(module_name, KAFKA_BROKER_NAME, KAFKA_TOPIC_NAME)
try:
check_output(["pgrep", "-f" , command], stderr=subprocess.STDOUT, universal_newlines=True)
logger.info("Change listener for {} already exist.".format(module_name))
except CalledProcessError:
subprocess.Popen(command.split(), stdout=subprocess.PIPE)
@classmethod
def stop_change_listener_for_model(cls, model_name):
logger.info("Stopping listener for model %s", model_name)
pid = cls.get_pid_by_name(model_name)
logger.info("pid is %s", pid)
command = "kill -2 {}".format(pid)
cls._run_bash_command(command)
@classmethod
def _run_bash_command(cls, command: str):
try:
logger.info("Attempts to invoke %s", command)
output = check_output(command.split(), stderr=subprocess.STDOUT,
universal_newlines=True)
logger.info("Output: %s", output)
if "ERR" in output:
raise RuntimeError(str(output))
except subprocess.CalledProcessError as e:
raise RuntimeError(e, str(e.stdout))
@classmethod
def get_pid_by_name(cls, name):
for dirname in os.listdir('/proc'):
if not dirname.isdigit():
continue
try:
with open('/proc/{}/cmdline'.format(dirname), mode='rb') as fd:
content = fd.read().decode().split('\x00')
except Exception as e:
print(e)
continue
if name in content:
return dirname
class YangModelServer(Resource):
logger = logging.getLogger('YangModelServer')
def __init__(self, yang_loader_helper: YangLoaderHelper = YangLoaderHelper()):
self._yang_loader_helper = yang_loader_helper
def post(self):
args = self._parse_request()
yang_model_file = args['yangModel']
initial_config_file = args['initialConfig']
module_name = args['moduleName']
model_path = self._yang_loader_helper.save_file(yang_model_file)
conf_path = self._yang_loader_helper.save_file(initial_config_file)
try:
self._yang_loader_helper.install_new_model(model_path)
self._yang_loader_helper.set_default_configuration(conf_path,
module_name)
self._yang_loader_helper.start_change_listener_for_model(module_name)
except RuntimeError as e:
self.logger.error(e.args, exc_info=True)
return str(e.args), 400
return "Successfully started"
def delete(self):
args = self._parse_request()
yang_model_name = args['yangModelName']
try:
self._yang_loader_helper.stop_change_listener_for_model(yang_model_name)
time.sleep(5)
self._yang_loader_helper.uninstall_a_model(yang_model_name)
except RuntimeError as e:
self.logger.error(e.args, exc_info=True)
return str(e.args), 400
return "Successfully deleted"
@classmethod
def _parse_request(cls) -> reqparse.Namespace:
parse = reqparse.RequestParser()
parse.add_argument('yangModel',
type=FileStorage,
location='files')
parse.add_argument('initialConfig',
type=FileStorage,
location='files')
parse.add_argument('moduleName', type=str)
parse.add_argument('yangModelName', type=str)
return parse.parse_args()
api.add_resource(YangModelServer, '/model')
if __name__ == '__main__':
logging.basicConfig(filename=os.path.dirname(__file__) + "/yang_loader.log",
filemode="w",
level=logging.DEBUG)
app.run(host='0.0.0.0', port='5002')
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