237 lines
10 KiB
Python
237 lines
10 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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"""
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The :class:`~openstack.connection.Connection` class is the primary interface
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to the Python SDK it maintains a context for a connection to a cloud provider.
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The connection has an attribute to access each supported service. The service
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attributes are created dynamically based on user profiles and the service
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catalog.
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Examples
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--------
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At a minimum, the :class:`~openstack.connection.Connection` class needs to be
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created with an authenticator or the parameters to build one.
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Create a connection
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~~~~~~~~~~~~~~~~~~~
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The following example constructor uses the identity authenticator using
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username and password. The default settings for the transport are used
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by this connection.::
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from openstack import connection
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auth_args = {
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'auth_url': 'http://172.20.1.108:5000/v3',
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'project_name': 'admin',
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'username': 'admin',
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'password': 'admin',
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}
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conn = connection.Connection(**auth_args)
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List
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~~~~
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Services are accessed through an attribute named after the service. A list
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of all the projects is retrieved in this manner::
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projects = conn.identity.list_projects()
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Find or create
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~~~~~~~~~~~~~~
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If you wanted to make sure you had a network named 'jenkins', you would first
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try to find it and if that fails, you would create it::
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network = conn.network.find_network("jenkins")
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if network is None:
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network = conn.network.create_network({"name": "jenkins"})
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"""
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import logging
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import sys
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from keystoneauth1.loading import base as ksa_loader
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import os_client_config
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from openstack import profile as _profile
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from openstack import proxy
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from openstack import session as _session
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from openstack import utils
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_logger = logging.getLogger(__name__)
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def from_config(cloud_name=None, cloud_config=None, options=None):
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"""Create a Connection using os-client-config
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:param str cloud_name: Use the `cloud_name` configuration details when
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creating the Connection instance.
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:param cloud_config: An instance of
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`os_client_config.config.OpenStackConfig`
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as returned from the os-client-config library.
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If no `config` is provided,
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`os_client_config.OpenStackConfig` will be called,
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and the provided `cloud_name` will be used in
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determining which cloud's configuration details
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will be used in creation of the
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`Connection` instance.
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:param options: An argparse Namespace object; allows direct passing
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in of argparse options to be added to the cloud config.
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This value is passed to the `argparse` argument of
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`os_client_config.config.OpenStackConfig.get_one_cloud`.
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:rtype: :class:`~openstack.connection.Connection`
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"""
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# TODO(thowe): I proposed that service name defaults to None in OCC
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defaults = {}
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prof = _profile.Profile()
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services = [service.service_type for service in prof.get_services()]
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for service in services:
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defaults[service + '_service_name'] = None
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# TODO(thowe): default is 2 which turns into v2 which doesn't work
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# this stuff needs to be fixed where we keep version and path separated.
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defaults['network_api_version'] = 'v2.0'
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if cloud_config is None:
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occ = os_client_config.OpenStackConfig(override_defaults=defaults)
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cloud_config = occ.get_one_cloud(cloud=cloud_name, argparse=options)
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if cloud_config.debug:
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utils.enable_logging(True, stream=sys.stdout)
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# TODO(mordred) we need to add service_type setting to openstacksdk.
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# Some clouds have type overridden as well as name.
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services = [service.service_type for service in prof.get_services()]
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for service in cloud_config.get_services():
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if service in services:
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version = cloud_config.get_api_version(service)
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if version:
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version = str(version)
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if not version.startswith("v"):
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version = "v" + version
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prof.set_version(service, version)
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name = cloud_config.get_service_name(service)
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if name:
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prof.set_name(service, name)
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interface = cloud_config.get_interface(service)
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if interface:
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prof.set_interface(service, interface)
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region = cloud_config.get_region_name(service)
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if region:
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for service in services:
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prof.set_region(service, region)
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# Auth
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auth = cloud_config.config['auth']
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# TODO(thowe) We should be using auth_type
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auth['auth_plugin'] = cloud_config.config['auth_type']
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if 'cacert' in auth:
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auth['verify'] = auth.pop('cacert')
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if 'cacert' in cloud_config.config:
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auth['verify'] = cloud_config.config['cacert']
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if 'insecure' in cloud_config.config:
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auth['verify'] = not bool(cloud_config.config['insecure'])
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return Connection(profile=prof, **auth)
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class Connection(object):
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def __init__(self, session=None, authenticator=None, profile=None,
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verify=True, user_agent=None, auth_plugin=None, **auth_args):
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"""Create a context for a connection to a cloud provider.
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A connection needs a transport and an authenticator. The user may pass
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in a transport and authenticator they want to use or they may pass in
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the parameters to create a transport and authenticator. The connection
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creates a
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:class:`~openstack.session.Session` which uses the profile
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and authenticator to perform HTTP requests.
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:param session: A session object compatible with
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:class:`~openstack.session.Session`.
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:type session: :class:`~openstack.session.Session`
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:param authenticator: An authenticator derived from the base
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authenticator plugin that was previously created. Two common
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authentication identity plugins are
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:class:`identity_v2 <openstack.auth.identity.v2.Auth>` and
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:class:`identity_v3 <openstack.auth.identity.v3.Auth>`.
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If this parameter is not passed in, the connection will create an
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authenticator.
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:type authenticator: :class:`~openstack.auth.base.BaseAuthPlugin`
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:param profile: If the user has any special profiles such as the
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service name, region, version or interface, they may be provided
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in the profile object. If no profiles are provided, the
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services that appear first in the service catalog will be used.
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:type profile: :class:`~openstack.profile.Profile`
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:param bool verify: If a transport is not provided to the connection,
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this parameter will be used to create a transport. If ``verify``
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is set to true, which is the default, the SSL cert will be
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verified. It can also be set to a CA_BUNDLE path.
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:param str user_agent: If a transport is not provided to the
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connection, this parameter will be used when creating a transport.
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The value given here will be prepended to the default, which is
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specified in :attr:`~openstack.transport.USER_AGENT`.
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The resulting ``user_agent`` value is used for the ``User-Agent``
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HTTP header.
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:param str auth_plugin: The name of authentication plugin to use. If
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the authentication plugin name is not provided, the connection will
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try to guess what plugin to use based on the *auth_url* in the
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*auth_args*. Two common values for the plugin would be
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``v3password`` and ``v3token``.
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:param auth_args: The rest of the parameters provided are assumed to be
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authentication arguments that are used by the authentication
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plugin.
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"""
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self.authenticator = self._create_authenticator(authenticator,
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auth_plugin,
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**auth_args)
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self.profile = profile if profile else _profile.Profile()
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self.session = session if session else _session.Session(
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self.profile, auth=self.authenticator, verify=verify,
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user_agent=user_agent)
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self._open()
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def _create_authenticator(self, authenticator, auth_plugin, **args):
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if authenticator:
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return authenticator
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# TODO(thowe): Jamie was suggesting we should support other
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# ways of loading the plugin
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loader = ksa_loader.get_plugin_loader(auth_plugin)
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load_args = {}
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for opt in loader.get_options():
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if args.get(opt.dest):
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load_args[opt.dest] = args[opt.dest]
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return loader.load_from_options(**load_args)
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def _open(self):
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"""Open the connection.
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NOTE(thowe): Have this set up some lazy loader instead.
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"""
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for service in self.profile.get_services():
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self._load(service)
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def _load(self, service):
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attr_name = service.get_service_module()
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module = service.get_module() + "._proxy"
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try:
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__import__(module)
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proxy_class = getattr(sys.modules[module], "Proxy")
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if not issubclass(proxy_class, proxy.BaseProxy):
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raise TypeError("%s.Proxy must inherit from BaseProxy" %
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proxy_class.__module__)
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setattr(self, attr_name, proxy_class(self.session))
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except Exception as e:
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_logger.warn("Unable to load %s: %s" % (module, e))
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