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configdep.py
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configdep.py
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# Copyright 2022 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/>.
import os
import json
import typing
from inspect import stack
from vyos.util import load_as_module
from vyos.defaults import directories
from vyos.configsource import VyOSError
from vyos import ConfigError
# https://peps.python.org/pep-0484/#forward-references
# for type 'Config'
if typing.TYPE_CHECKING:
from vyos.config import Config
dependent_func: dict[str, list[typing.Callable]] = {}
def canon_name(name: str) -> str:
return os.path.splitext(name)[0].replace('-', '_')
def canon_name_of_path(path: str) -> str:
script = os.path.basename(path)
return canon_name(script)
def caller_name() -> str:
return stack()[-1].filename
def read_dependency_dict() -> dict:
path = os.path.join(directories['data'],
'config-mode-dependencies.json')
with open(path) as f:
d = json.load(f)
return d
def get_dependency_dict(config: 'Config') -> dict:
if hasattr(config, 'cached_dependency_dict'):
d = getattr(config, 'cached_dependency_dict')
else:
d = read_dependency_dict()
setattr(config, 'cached_dependency_dict', d)
return d
def run_config_mode_script(script: str, config: 'Config'):
path = os.path.join(directories['conf_mode'], script)
name = canon_name(script)
mod = load_as_module(name, path)
config.set_level([])
try:
c = mod.get_config(config)
mod.verify(c)
mod.generate(c)
mod.apply(c)
except (VyOSError, ConfigError) as e:
raise ConfigError(repr(e))
def def_closure(target: str, config: 'Config',
tagnode: typing.Optional[str] = None) -> typing.Callable:
script = target + '.py'
def func_impl():
if tagnode:
os.environ['VYOS_TAGNODE_VALUE'] = tagnode
run_config_mode_script(script, config)
return func_impl
def set_dependents(case: str, config: 'Config',
tagnode: typing.Optional[str] = None):
d = get_dependency_dict(config)
k = canon_name_of_path(caller_name())
l = dependent_func.setdefault(k, [])
for target in d[k][case]:
func = def_closure(target, config, tagnode)
l.append(func)
def call_dependents():
k = canon_name_of_path(caller_name())
l = dependent_func.get(k, [])
while l:
f = l.pop(0)
f()

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