/
__init__.py
114 lines (98 loc) · 4.25 KB
/
__init__.py
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
# Copyright 2015 Spotify AB. All rights reserved.
#
# The contents of this file are 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.
"""napalm.base package."""
# Python std lib
import inspect
import importlib
# NAPALM base
from typing import Type
from napalm.base.base import NetworkDriver
from napalm.base.exceptions import ModuleImportError
from napalm.base.mock import MockDriver
__all__ = [
"get_network_driver", # export the function
"NetworkDriver", # also export the base class
]
def get_network_driver(name: str, prepend: bool = True) -> Type[NetworkDriver]:
"""
Searches for a class derived form the base NAPALM class NetworkDriver in a specific library.
The library name must repect the following pattern: napalm_[DEVICE_OS].
NAPALM community supports a list of devices and provides the corresponding libraries; for
full reference please refer to the `Supported Network Operation Systems`_ paragraph on
`Read the Docs`_.
.. _`Supported Network Operation Systems`: \
http://napalm.readthedocs.io/en/latest/#supported-network-operating-systems
.. _`Read the Docs`: \
http://napalm.readthedocs.io/
:param name: the name of the device operating system or the name of the library.
:return: the first class derived from NetworkDriver, found in the library.
:raise ModuleImportError: when the library is not installed or a derived class from \
NetworkDriver was not found.
Example::
.. code-block:: python
>>> get_network_driver('junos')
<class 'napalm.junos.junos.JunOSDriver'>
>>> get_network_driver('IOS-XR')
<class 'napalm.iosxr.iosxr.IOSXRDriver'>
>>> get_network_driver('napalm.eos')
<class 'napalm.eos.eos.EOSDriver'>
>>> get_network_driver('wrong')
napalm.base.exceptions.ModuleImportError: Cannot import "napalm_wrong". Is the library \
installed?
"""
if name == "mock":
return MockDriver
if not (isinstance(name, str) and len(name) > 0):
raise ModuleImportError("Please provide a valid driver name.")
# Only lowercase allowed
name = name.lower()
# Try to not raise error when users requests IOS-XR for e.g.
module_install_name = name.replace("-", "")
community_install_name = "napalm_{name}".format(name=module_install_name)
custom_install_name = "custom_napalm.{name}".format(name=module_install_name)
# Can also request using napalm_[SOMETHING]
if "napalm" not in module_install_name and prepend is True:
module_install_name = "napalm.{name}".format(name=module_install_name)
# Order is custom_napalm_os (local only) -> napalm.os (core) -> napalm_os (community)
for module_name in [
custom_install_name,
module_install_name,
community_install_name,
]:
try:
module = importlib.import_module(module_name)
break
except ImportError as e:
message = str(e)
if "No module named" in message:
# py2 doesn't have ModuleNotFoundError exception
failed_module = message.split()[-1]
if failed_module.replace("'", "") in module_name:
continue
raise e
else:
raise ModuleImportError(
'Cannot import "{install_name}". Is the library installed?'.format(
install_name=name
)
)
for name, obj in inspect.getmembers(module):
if inspect.isclass(obj) and issubclass(obj, NetworkDriver):
return obj
# looks like you don't have any Driver class in your module...
raise ModuleImportError(
'No class inheriting "napalm.base.base.NetworkDriver" found in "{install_name}".'.format(
install_name=module_install_name
)
)