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# Copyright 2019 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
from inspect import signature
from inspect import _empty
from vyos import debug
from vyos.util import popen
from vyos.util import cmd
from vyos.ifconfig.section import Section
class Control(Section):
_command_get = {}
_command_set = {}
_signature = {}
def __init__(self, **kargs):
# some commands (such as operation comands - show interfaces, etc.)
# need to query the interface statistics. If the interface
# code is used and the debugging is enabled, the screen output
# will include both the command but also the debugging for that command
# to prevent this, debugging can be explicitely disabled
# if debug is not explicitely disabled the the config, enable it
self.debug = ''
if kargs.get('debug', True) and debug.enabled('ifconfig'):
self.debug = 'ifconfig'
def _debug_msg (self, message):
return debug.message(message, self.debug)
def _popen(self, command):
return popen(command, self.debug)
def _cmd(self, command):
return cmd(command, self.debug)
def _get_command(self, config, name):
"""
Using the defined names, set data write to sysfs.
"""
cmd = self._command_get[name]['shellcmd'].format(**config)
return self._command_get[name].get('format', lambda _: _)(self._cmd(cmd))
def _values(self, name, validate, value):
"""
looks at the validation function "validate"
for the interface sysfs or command and
returns a dict with the right options to call it
"""
if name not in self._signature:
self._signature[name] = signature(validate)
values = {}
for k in self._signature[name].parameters:
default = self._signature[name].parameters[k].default
if default is not _empty:
continue
if k == 'self':
values[k] = self
elif k == 'ifname':
values[k] = self.ifname
else:
values[k] = value
return values
def _set_command(self, config, name, value):
"""
Using the defined names, set data write to sysfs.
"""
# the code can pass int as int
value = str(value)
validate = self._command_set[name].get('validate', None)
if validate:
try:
validate(**self._values(name, validate, value))
except Exception as e:
raise e.__class__(f'Could not set {name}. {e}')
convert = self._command_set[name].get('convert', None)
if convert:
value = convert(value)
possible = self._command_set[name].get('possible', None)
if possible and not possible(config['ifname'], value):
return False
config = {**config, **{'value': value}}
cmd = self._command_set[name]['shellcmd'].format(**config)
return self._command_set[name].get('format', lambda _: _)(self._cmd(cmd))
_sysfs_get = {}
_sysfs_set = {}
def _read_sysfs(self, filename):
"""
Provide a single primitive w/ error checking for reading from sysfs.
"""
value = None
with open(filename, 'r') as f:
value = f.read().rstrip('\n')
self._debug_msg("read '{}' < '{}'".format(value, filename))
return value
def _write_sysfs(self, filename, value):
"""
Provide a single primitive w/ error checking for writing to sysfs.
"""
self._debug_msg("write '{}' > '{}'".format(value, filename))
if os.path.isfile(filename):
with open(filename, 'w') as f:
f.write(str(value))
return True
return False
def _get_sysfs(self, config, name):
"""
Using the defined names, get data write from sysfs.
"""
filename = self._sysfs_get[name]['location'].format(**config)
if not filename:
return None
return self._read_sysfs(filename)
def _set_sysfs(self, config, name, value):
"""
Using the defined names, set data write to sysfs.
"""
# the code can pass int as int
value = str(value)
validate = self._sysfs_set[name].get('validate', None)
if validate:
try:
validate(**self._values(name, validate, value))
except Exception as e:
raise e.__class__(f'Could not set {name}. {e}')
config = {**config, **{'value': value}}
convert = self._sysfs_set[name].get('convert', None)
if convert:
value = convert(value)
commited = self._write_sysfs(
self._sysfs_set[name]['location'].format(**config), value)
if not commited:
errmsg = self._sysfs_set.get('errormsg', '')
if errmsg:
raise TypeError(errmsg.format(**config))
return commited
def get_interface(self, name):
if name in self._sysfs_get:
return self._get_sysfs(self.config, name)
if name in self._command_get:
return self._get_command(self.config, name)
raise KeyError(f'{name} is not a attribute of the interface we can get')
def set_interface(self, name, value):
if name in self._sysfs_set:
return self._set_sysfs(self.config, name, value)
if name in self._command_set:
return self._set_command(self.config, name, value)
raise KeyError(f'{name} is not a attribute of the interface we can set')
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