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opmode.py
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opmode.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 re
import sys
import typing
def _is_op_mode_function_name(name):
if re.match(r"^(show|clear|reset|restart)", name):
return True
else:
return False
def _is_show(name):
if re.match(r"^show", name):
return True
else:
return False
def _get_op_mode_functions(module):
from inspect import getmembers, isfunction
# Get all functions in that module
funcs = getmembers(module, isfunction)
# getmembers returns (name, func) tuples
funcs = list(filter(lambda ft: _is_op_mode_function_name(ft[0]), funcs))
funcs_dict = {}
for (name, thunk) in funcs:
funcs_dict[name] = thunk
return funcs_dict
def _is_optional_type(t):
# Optional[t] is internally an alias for Union[t, NoneType]
# and there's no easy way to get union members it seems
if (type(t) == typing._UnionGenericAlias):
if (len(t.__args__) == 2):
if t.__args__[1] == type(None):
return True
return False
def _get_arg_type(t):
""" Returns the type itself if it's a primitive type,
or the "real" type of typing.Optional
Doesn't work with anything else at the moment!
"""
if _is_optional_type(t):
return t.__args__[0]
else:
return t
def run(module):
from argparse import ArgumentParser
functions = _get_op_mode_functions(module)
parser = ArgumentParser()
subparsers = parser.add_subparsers(dest="subcommand")
for function_name in functions:
subparser = subparsers.add_parser(function_name, help=functions[function_name].__doc__)
type_hints = typing.get_type_hints(functions[function_name])
for opt in type_hints:
th = type_hints[opt]
if _get_arg_type(th) == bool:
subparser.add_argument(f"--{opt}", action='store_true')
else:
if _is_optional_type(th):
subparser.add_argument(f"--{opt}", type=_get_arg_type(th), default=None)
else:
subparser.add_argument(f"--{opt}", type=_get_arg_type(th), required=True)
# Get options as a dict rather than a namespace,
# so that we can modify it and pack for passing to functions
args = vars(parser.parse_args())
if not args["subcommand"]:
print("Subcommand required!")
parser.print_usage()
sys.exit(1)
function_name = args["subcommand"]
func = functions[function_name]
# Remove the subcommand from the arguments,
# it would cause an extra argument error when we pass the dict to a function
del args["subcommand"]
# Show commands must always get the "raw" argument,
# but other commands (clear/reset/restart) should not,
# because they produce no output and it makes no sense for them.
if ("raw" not in args) and _is_show(function_name):
args["raw"] = False
if re.match(r"^show", function_name):
# Show commands are slightly special:
# they may return human-formatted output
# or a raw dict that we need to serialize in JSON for printing
res = func(**args)
if not args["raw"]:
return res
else:
from json import dumps
return dumps(res, indent=4)
else:
# Other functions should not return anything,
# although they may print their own warnings or status messages
func(**args)

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