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config.py
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config.py
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# Copyright (c) 2017 VyOS maintainers and contributors
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the Software
# is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
# INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
# OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
# IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
import subprocess
import re
class VyOSError(Exception):
pass
class Config(object):
def __init__(self):
self._cli_shell_api = "/bin/cli-shell-api"
self._level = ""
def _make_command(self, op, path):
args = path.split()
cmd = [self._cli_shell_api, op] + args
return cmd
def _run(self, cmd):
p = subprocess.Popen(cmd, stdout=subprocess.PIPE)
out = p.stdout.read()
p.wait()
if p.returncode != 0:
raise VyOSError()
else:
return out
def set_level(self, path):
# Make sure there's always a space between default path (level)
# and path supplied as method argument
# XXX: for small strings in-place concatenation is not a problem
self._level = path + " "
def get_level(self):
return(self._level.strip())
def exists(self, path):
try:
self._run(self._make_command('exists', self._level + path))
return True
except VyOSError:
return False
def session_changed(self):
try:
self._run(self._make_command('sessionChanged', ''))
return True
except VyOSError:
return False
def in_session(self):
try:
self._run(self._make_command('inSession', ''))
return True
except VyOSError:
return False
def is_multi(self, path):
try:
self._run(self._make_command('isMulti', self._level + path))
return True
except VyOSError:
return False
def is_tag(self, path):
try:
self._run(self._make_command('isTag', self._level + path))
return True
except VyOSError:
return False
def is_leaf(self, path):
try:
self._run(self._make_command('isLeaf', self._level + path))
return True
except VyOSError:
return False
def return_value(self, path):
full_path = self._level + path
if self.is_multi(path):
raise VyOSError("Cannot use return_value on multi node: {0}".format(full_path))
elif not self.is_leaf(path):
raise VyOSError("Cannot use return_value on non-leaf node: {0}".format(full_path))
else:
try:
out = self._run(self._make_command('returnValue', full_path))
return out
except VyOSError:
raise VyOSError("Path doesn't exist: {0}".format(full_path))
def return_values(self, path):
full_path = self._level + path
if not self.is_multi(path):
raise VyOSError("Cannot use return_values on non-multi node: {0}".format(full_path))
elif not self.is_leaf(path):
raise VyOSError("Cannot use return_values on non-leaf node: {0}".format(full_path))
else:
try:
out = self._run(self._make_command('returnValues', full_path))
return out
except VyOSError:
raise VyOSError("Path doesn't exist: {0}".format(full_path))
def list_nodes(self, path):
full_path = self._level + path
if self.is_tag(path):
try:
out = self._run(self._make_command('listNodes', full_path))
values = out.split()
return list(map(lambda x: re.sub(r'^\'(.*)\'$', r'\1',x), values))
except VyOSError:
raise VyOSError("Path doesn't exist: {0}".format(full_path))
else:
raise VyOSError("Cannot use list_nodes on a non-tag node: {0}".format(full_path))

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