1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
|
# 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
class Error(Exception):
""" Any error that makes requested operation impossible to complete
for reasons unrelated to the user input or script logic.
"""
pass
class UnconfiguredSubsystem(Error):
""" Requested operation is valid, but cannot be completed
because corresponding subsystem is not configured and running.
"""
pass
class DataUnavailable(Error):
""" Requested operation is valid, but cannot be completed
because data for it is not available.
This error MAY be treated as temporary because such issues
are often caused by transient events such as service restarts.
"""
pass
class PermissionDenied(Error):
""" Requested operation is valid, but the caller has no permission
to perform it.
"""
pass
class InternalError(Error):
""" Any situation when VyOS detects that it could not perform
an operation correctly due to logic errors in its own code
or errors in underlying software.
"""
pass
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 _normalize_field_name(name):
# Convert the name to string if it is not
# (in some cases they may be numbers)
name = str(name)
# Replace all separators with underscores
name = re.sub(r'(\s|[\(\)\[\]\{\}\-\.\,:\"\'\`])+', '_', name)
# Replace specific characters with textual descriptions
name = re.sub(r'@', '_at_', name)
name = re.sub(r'%', '_percentage_', name)
name = re.sub(r'~', '_tilde_', name)
# Force all letters to lowercase
name = name.lower()
# Remove leading and trailing underscores, if any
name = re.sub(r'(^(_+)(?=[^_])|_+$)', '', name)
# Ensure there are only single underscores
name = re.sub(r'_+', '_', name)
return name
def _normalize_dict_field_names(old_dict):
new_dict = {}
for key in old_dict:
new_key = _normalize_field_name(key)
new_dict[new_key] = _normalize_field_names(old_dict[key])
# Sanity check
if len(old_dict) != len(new_dict):
raise InternalError("Dictionary fields do not allow unique normalization")
else:
return new_dict
def _normalize_field_names(value):
if isinstance(value, dict):
return _normalize_dict_field_names(value)
elif isinstance(value, list):
return list(map(lambda v: _normalize_field_names(v), value))
else:
return value
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])
if 'return' in type_hints:
del type_hints['return']
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:
res = _normalize_field_names(res)
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)
|
