add initial support for Arista eAPI

This commit adds the shared module support for Arisat EOS devices
running eAPI.  The shared module builds on top of module_utils/urls.py.
pull/13112/head
Peter Sprygada 9 years ago
parent e56fd9e95d
commit 2e98f7f429

@ -0,0 +1,155 @@
#
# (c) 2015 Peter Sprygada, <psprygada@ansible.com>
#
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible 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 Ansible. If not, see <http://www.gnu.org/licenses/>.
#
"""
This module adds shared support for Arista EOS devices using eAPI over
HTTP/S transport. It is built on module_utils/urls.py which is required
for proper operation.
In order to use this module, include it as part of a custom
module as shown below.
** Note: The order of the import statements does matter. **
from ansible.module_utils.basic import *
from ansible.module_utils.urls import *
from ansible.module_utils.eapi import *
The eapi module provides the following common argument spec:
* host (str) - [Required] The IPv4 address or FQDN of the network device
* port (str) - Overrides the default port to use for the HTTP/S
connection. The default values are 80 for HTTP and
443 for HTTPS
* url_username (str) - [Required] The username to use to authenticate
the HTTP/S connection. Aliases: username
* url_password (str) - [Required] The password to use to authenticate
the HTTP/S connection. Aliases: password
* use_ssl (bool) - Specifies whether or not to use an encrypted (HTTPS)
connection or not. The default value is False.
* enable_mode (bool) - Specifies whether or not to enter `enable` mode
prior to executing the command list. The default value is True
* enable_password (str) - The password for entering `enable` mode
on the switch if configured.
In order to communicate with Arista EOS devices, the eAPI feature
must be enabled and configured on the device.
"""
def eapi_argument_spec(spec=None):
"""Creates an argument spec for working with eAPI
"""
arg_spec = url_argument_spec()
arg_spec.update(dict(
host=dict(required=True),
port=dict(),
url_username=dict(required=True, aliases=['username']),
url_password=dict(required=True, aliases=['password']),
use_ssl=dict(default=True, type='bool'),
enable_mode=dict(default=True, type='bool'),
enable_password=dict()
))
if spec:
arg_spec.update(spec)
return arg_spec
def eapi_url(module):
"""Construct a valid Arist eAPI URL
"""
if module.params['use_ssl']:
proto = 'https'
else:
proto = 'http'
host = module.params['host']
url = '{}://{}'.format(proto, host)
if module.params['port']:
url = '{}:{}'.format(url, module.params['port'])
return '{}/command-api'.format(url)
def to_list(arg):
"""Convert the argument to a list object
"""
if isinstance(arg, (list, tuple)):
return list(arg)
elif arg is not None:
return [arg]
else:
return []
def eapi_body(commands, encoding, reqid=None):
"""Create a valid eAPI JSON-RPC request message
"""
params = dict(version=1, cmds=to_list(commands), format=encoding)
return dict(jsonrpc='2.0', id=reqid, method='runCmds', params=params)
def eapi_enable_mode(module):
"""Build commands for entering `enable` mode on the switch
"""
if module.params['enable_mode']:
passwd = module.params['enable_password']
if passwd:
return dict(cmd='enable', input=passwd)
else:
return 'enable'
def eapi_command(module, commands, encoding='json'):
"""Send an ordered list of commands to the device over eAPI
"""
commands = to_list(commands)
url = eapi_url(module)
enable = eapi_enable_mode(module)
if enable:
commands.insert(0, enable)
data = eapi_body(commands, encoding)
data = module.jsonify(data)
headers = {'Content-Type': 'application/json-rpc'}
response, headers = fetch_url(module, url, data=data, headers=headers,
method='POST')
if headers['status'] != 200:
module.fail_json(**headers)
response = module.from_json(response.read())
if 'error' in response:
err = response['error']
module.fail_json(msg='json-rpc error', **err)
if enable:
response['result'].pop(0)
return response['result'], headers
def eapi_configure(module, commands):
"""Send configuration commands to the device over eAPI
"""
commands.insert(0, 'configure')
response, headers = eapi_command(module, commands)
response.pop(0)
return response, headers
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