python-keystoneclient/doc/source/using-api-v3.rst

The Client v3 API

Introduction

The main concepts in the Identity v3 API are:

• credentials
• domains
• endpoints
• groups
• policies
• projects
• role assignments
• roles
• services
• trusts
• users

The :pykeystoneclient.v3.client API lets you query and make changes through managers. For example, to manipulate a project (formerly called tenant), you interact with a :pykeystoneclient.v3.projects.ProjectManager object.

You obtain access to managers through attributes of a :pykeystoneclient.v3.client.Client object. For example, the projects attribute of a Client object is a projects manager:

>>> from keystoneclient.v3 import client
>>> keystone = client.Client(...)
>>> keystone.projects.list() # List projects

While it is possible to instantiate a :pykeystoneclient.v3.client.Client object (as done above for clarity), the recommended approach is to use the discovery mechanism provided by the :pykeystoneclient.client.Client class. The appropriate class will be instantiated depending on the API versions available:

>>> from keystoneclient import client
>>> keystone =
...    client.Client(auth_url='http://localhost:5000', ...)
>>> type(keystone)
<class 'keystoneclient.v3.client.Client'>

One can force the use of a specific version of the API, either by using the version keyword argument:

>>> from keystoneclient import client
>>> keystone = client.Client(auth_url='http://localhost:5000',
                             version=(2,), ...)
>>> type(keystone)
<class 'keystoneclient.v2_0.client.Client'>
>>> keystone = client.Client(auth_url='http://localhost:5000',
                             version=(3,), ...)
>>> type(keystone)
<class 'keystoneclient.v3.client.Client'>

Or by specifying directly the specific API version authentication URL as the auth_url keyword argument:

>>> from keystoneclient import client
>>> keystone =
...     client.Client(auth_url='http://localhost:5000/v2.0', ...)
>>> type(keystone)
<class 'keystoneclient.v2_0.client.Client'>
>>> keystone =
...     client.Client(auth_url='http://localhost:5000/v3', ...)
>>> type(keystone)
<class 'keystoneclient.v3.client.Client'>

Upon successful authentication, a :pykeystoneclient.v3.client.Client object is returned (when using the Identity v3 API). Authentication and examples of common tasks are provided below.

You can generally expect that when the client needs to propagate an exception it will raise an instance of subclass of keystoneclient.exceptions.ClientException (see :pykeystoneclient.openstack.common.apiclient.exceptions.ClientException)

Authenticating Using Sessions

Instantiate a :pykeystoneclient.v3.client.Client using a :py~keystoneclient.session.Session to provide the authentication plugin, SSL/TLS certificates, and other data:

>>> from keystoneclient.auth.identity import v3
>>> from keystoneclient import session
>>> from keystoneclient.v3 import client
>>> auth = v3.Password(auth_url='https://my.keystone.com:5000/v3',
...                    user_id='myuserid',
...                    password='mypassword',
...                    project_id='myprojectid')
>>> sess = session.Session(auth=auth)
>>> keystone = client.Client(session=sess)

For more information on Sessions refer to: Using Sessions.

Non-Session Authentication (deprecated)

The deprecated way to authenticate is to pass the username, the user's domain name (which will default to 'Default' if it is not specified), and a password:

>>> from keystoneclient import client
>>> auth_url = 'http://localhost:5000'
>>> username = 'adminUser'
>>> user_domain_name = 'Default'
>>> password = 'secreetword'
>>> keystone = client.Client(auth_url=auth_url, version=(3,),
...                          username=username, password=password,
...                          user_domain_name=user_domain_name)

A :py~keystoneclient.session.Session should be passed to the Client instead. Using a Session you're not limited to authentication using a username and password but can take advantage of other more secure authentication methods.

You may optionally specify a domain or project (along with its project domain name), to obtain a scoped token:

>>> from keystoneclient import client
>>> auth_url = 'http://localhost:5000'
>>> username = 'adminUser'
>>> user_domain_name = 'Default'
>>> project_name = 'demo'
>>> project_domain_name = 'Default'
>>> password = 'secreetword'
>>> keystone = client.Client(auth_url=auth_url, version=(3,),
...                          username=username, password=password,
...                          user_domain_name=user_domain_name,
...                          project_name=project_name,
...                          project_domain_name=project_domain_name)