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# Copyright 2012-2013 OpenStack, LLC.
#
# 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.
#
"""Common client utilities"""
import os
import sys
import uuid
from openstackclient.common import exceptions
def find_resource(manager, name_or_id):
"""Helper for the _find_* methods."""
# Try to get entity as integer id
try:
if isinstance(name_or_id, int) or name_or_id.isdigit():
return manager.get(int(name_or_id))
except exceptions.NotFound:
pass
# Try to get entity as uuid
try:
uuid.UUID(str(name_or_id))
return manager.get(name_or_id)
except (ValueError, exceptions.NotFound):
pass
# Try directly using the passed value
try:
return manager.get(name_or_id)
except Exception:
pass
kwargs = {}
if 'NAME_ATTR' in manager.resource_class.__dict__:
# novaclient does this for oddball resources
kwargs[manager.resource_class.NAME_ATTR] = name_or_id
else:
kwargs['name'] = name_or_id
# finally try to find entity by name
try:
return manager.find(**kwargs)
# FIXME(dtroyer): The exception to catch here is dependent on which
# client library the manager passed in belongs to.
# Eventually this should be pulled from a common set
# of client exceptions.
except Exception as ex:
try:
return manager.find(display_name=name_or_id)
except Exception:
pass
if type(ex).__name__ == 'NotFound':
msg = "No %s with a name or ID of '%s' exists." % \
(manager.resource_class.__name__.lower(), name_or_id)
raise exceptions.CommandError(msg)
else:
raise
def get_item_properties(item, fields, mixed_case_fields=[], formatters={}):
"""Return a tuple containing the item properties.
:param item: a single item resource (e.g. Server, Tenant, etc)
:param fields: tuple of strings with the desired field names
:param mixed_case_fields: tuple of field names to preserve case
:param formatters: dictionary mapping field names to callables
to format the values
"""
row = []
for field in fields:
if field in formatters:
row.append(formatters[field](item))
else:
if field in mixed_case_fields:
field_name = field.replace(' ', '_')
else:
field_name = field.lower().replace(' ', '_')
data = getattr(item, field_name, '')
row.append(data)
return tuple(row)
def string_to_bool(arg):
return arg.strip().lower() in ('t', 'true', 'yes', '1')
def env(*vars, **kwargs):
"""Search for the first defined of possibly many env vars
Returns the first environment variable defined in vars, or
returns the default defined in kwargs.
"""
for v in vars:
value = os.environ.get(v, None)
if value:
return value
return kwargs.get('default', '')
def import_class(import_str):
"""Returns a class from a string including module and class
:param import_str: a string representation of the class name
:rtype: the requested class
"""
mod_str, _sep, class_str = import_str.rpartition('.')
__import__(mod_str)
return getattr(sys.modules[mod_str], class_str)
def get_client_class(api_name, version, version_map):
"""Returns the client class for the requested API version
:param api_name: the name of the API, e.g. 'compute', 'image', etc
:param version: the requested API version
:param version_map: a dict of client classes keyed by version
:rtype: a client class for the requested API version
"""
try:
client_path = version_map[str(version)]
except (KeyError, ValueError):
msg = "Invalid %s client version '%s'. must be one of: %s" % (
(api_name, version, ', '.join(version_map.keys())))
raise exceptions.UnsupportedVersion(msg)
return import_class(client_path)
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