216 lines
7.0 KiB
Python
216 lines
7.0 KiB
Python
# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""Utilities and helper functions."""
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import ast
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import contextlib
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import os
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import shutil
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import six
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import tempfile
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import webob.exc
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from keystoneclient import discover as ks_discover
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from oslo_config import cfg
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from oslo_log import log as logging
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from oslo_utils import importutils
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from oslo_utils import strutils
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from oslo_utils import timeutils
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from karbor import exception
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from karbor.i18n import _
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from stevedore import driver
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CONF = cfg.CONF
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LOG = logging.getLogger(__name__)
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def find_config(config_path):
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"""Find a configuration file using the given hint.
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:param config_path: Full or relative path to the config.
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:returns: Full path of the config, if it exists.
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:raises karbor.exception.ConfigNotFound:
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"""
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possible_locations = [
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config_path,
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os.path.join("/var/lib/karbor", "etc", "karbor", config_path),
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os.path.join("/var/lib/karbor", "etc", config_path),
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os.path.join("/var/lib/karbor", config_path),
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"/etc/karbor/%s" % config_path,
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]
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for path in possible_locations:
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if os.path.exists(path):
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return os.path.abspath(path)
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raise exception.ConfigNotFound(path=os.path.abspath(config_path))
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def service_is_up(service):
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"""Check whether a service is up based on last heartbeat."""
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last_heartbeat = service['updated_at'] or service['created_at']
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elapsed = (timeutils.utcnow() - last_heartbeat).total_seconds()
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return abs(elapsed) <= CONF.service_down_time
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def remove_invalid_filter_options(context, filters,
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allowed_search_options):
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"""Remove search options that are not valid for non-admin API/context."""
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if context.is_admin:
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# Allow all options
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return
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# Otherwise, strip out all unknown options
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unknown_options = [opt for opt in filters
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if opt not in allowed_search_options]
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bad_options = ", ".join(unknown_options)
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LOG.debug("Removing options '%s' from query.", bad_options)
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for opt in unknown_options:
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del filters[opt]
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def check_filters(filters):
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for k, v in filters.items():
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try:
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filters[k] = ast.literal_eval(v)
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except (ValueError, SyntaxError):
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LOG.debug('Could not evaluate value %s, assuming string', v)
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def is_valid_boolstr(val):
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"""Check if the provided string is a valid bool string or not."""
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val = str(val).lower()
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return val in ('true', 'false', 'yes', 'no', 'y', 'n', '1', '0')
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def get_bool_param(param_string, params):
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param = params.get(param_string, False)
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if not is_valid_boolstr(param):
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msg = _('Value %(param)s for %(param_string)s is not a '
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'boolean.') % {'param': param, 'param_string': param_string}
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raise exception.InvalidParameterValue(err=msg)
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return strutils.bool_from_string(param, strict=True)
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def load_class(namespace, plugin_name):
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try:
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LOG.debug('Start load plugin %s. ', plugin_name)
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# Try to resolve plugin by name
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mgr = driver.DriverManager(namespace, plugin_name)
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return mgr.driver
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except RuntimeError as e1:
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# fallback to class name
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try:
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return importutils.import_class(plugin_name)
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except ImportError as e2:
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LOG.error("Error loading plugin by name, %s", e1)
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LOG.error("Error loading plugin by class, %s", e2)
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raise ImportError(_("Class not found."))
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def load_plugin(namespace, plugin_name, *args, **kwargs):
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plugin_class = load_class(namespace, plugin_name)
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return plugin_class(*args, **kwargs)
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def get_auth_uri(v3=True):
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# Look for the keystone auth_uri in the configuration. First we
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# check the [clients_keystone] section, and if it is not set we
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# look in [keystone_authtoken]
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if cfg.CONF.clients_keystone.auth_uri:
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discover = ks_discover.Discover(
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auth_url=cfg.CONF.clients_keystone.auth_uri)
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return discover.url_for('3.0')
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else:
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# Import auth_token to have keystone_authtoken settings setup.
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importutils.import_module('keystonemiddleware.auth_token')
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auth_uri = cfg.CONF.keystone_authtoken.www_authenticate_uri
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return auth_uri.replace('v2.0', 'v3') if auth_uri and v3 else auth_uri
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def validate_integer(value, name, min_value=None, max_value=None):
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"""Make sure that value is a valid integer, potentially within range.
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:param value: the value of the integer
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:param name: the name of the integer
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:param min_length: the min_length of the integer
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:param max_length: the max_length of the integer
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:returns: integer
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"""
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try:
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value = int(value)
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except (TypeError, ValueError, UnicodeEncodeError):
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raise webob.exc.HTTPBadRequest(explanation=(
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_('%s must be an integer.') % name))
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if min_value is not None and value < min_value:
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raise webob.exc.HTTPBadRequest(
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explanation=(_('%(value_name)s must be >= %(min_value)d') %
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{'value_name': name, 'min_value': min_value}))
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if max_value is not None and value > max_value:
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raise webob.exc.HTTPBadRequest(
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explanation=(_('%(value_name)s must be <= %(max_value)d') %
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{'value_name': name, 'max_value': max_value}))
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return value
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def walk_class_hierarchy(clazz, encountered=None):
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"""Walk class hierarchy, yielding most derived classes first."""
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if not encountered:
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encountered = []
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for subclass in clazz.__subclasses__():
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if subclass not in encountered:
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encountered.append(subclass)
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# drill down to leaves first
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for subsubclass in walk_class_hierarchy(subclass, encountered):
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yield subsubclass
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yield subclass
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@contextlib.contextmanager
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def tempdir(**kwargs):
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tmpdir = tempfile.mkdtemp(**kwargs)
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try:
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yield tmpdir
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finally:
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try:
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shutil.rmtree(tmpdir)
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except OSError as e:
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LOG.debug('Could not remove tmpdir: %s',
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six.text_type(e))
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class DoNothing(str):
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"""Class that literally does nothing.
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We inherit from str in case it's called with json.dumps.
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"""
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def __call__(self, *args, **kwargs):
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return self
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def __getattr__(self, name):
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return self
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DO_NOTHING = DoNothing()
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def notifications_enabled(conf):
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"""Check if oslo notifications are enabled."""
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notifications_driver = set(conf.oslo_messaging_notifications.driver)
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return notifications_driver and notifications_driver != {'noop'}
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