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base_vyostest_shim.py
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base_vyostest_shim.py
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# Copyright (C) 2021 VyOS maintainers and contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or later as
# published by the Free Software Foundation.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import os
import unittest
from time import sleep
from vyos.configsession import ConfigSession
from vyos.configsession import ConfigSessionError
from vyos import ConfigError
from vyos.util import cmd
save_config = '/tmp/vyos-smoketest-save'
# This class acts as shim between individual Smoketests developed for VyOS and
# the Python UnitTest framework. Before every test is loaded, we dump the current
# system configuration and reload it after the test - despite the test results.
#
# Using this approach we can not render a live system useless while running any
# kind of smoketest. In addition it adds debug capabilities like printing the
# command used to execute the test.
class VyOSUnitTestSHIM:
class TestCase(unittest.TestCase):
# if enabled in derived class, print out each and every set/del command
# on the CLI. This is usefull to grap all the commands required to
# trigger the certain failure condition.
# Use "self.debug = True" in derived classes setUp() method
debug = False
@classmethod
def setUpClass(cls):
cls._session = ConfigSession(os.getpid())
cls._session.save_config(save_config)
pass
@classmethod
def tearDownClass(cls):
# discard any pending changes which might caused a messed up config
cls._session.discard()
# ... and restore the initial state
cls._session.migrate_and_load_config(save_config)
try:
cls._session.commit()
except (ConfigError, ConfigSessionError):
cls._session.discard()
cls.fail(cls)
def cli_set(self, config):
if self.debug:
print('set ' + ' '.join(config))
self._session.set(config)
def cli_delete(self, config):
if self.debug:
print('del ' + ' '.join(config))
self._session.delete(config)
def cli_commit(self):
self._session.commit()
def getFRRconfig(self, string, end='$', endsection='^!'):
""" Retrieve current "running configuration" from FRR """
command = f'vtysh -c "show run" | sed -n "/^{string}{end}/,/{endsection}/p"'
count = 0
tmp = ''
while count < 10 and tmp == '':
# Let FRR settle after a config change first before harassing it again
sleep(1)
tmp = cmd(command)
count += 1
if self.debug or tmp == '':
import pprint
print(f'\n\ncommand "{command}" returned:\n')
pprint.pprint(tmp)
return tmp

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