tapispy 0.1.0.dev0

Python SDK for the Tapis computing platform.

Python2/3 binding for TACC.Cloud Tapis and Abaco APIs

• Documentation: https://agavepy.readthedocs.io/en/latest/

• GitHub: https://github.com/TACC/agavepy

• PyPI: https://pypi.python.org/pypi/agavepy

• Free software: 3-Clause BSD License

Installation

Install from PyPI:

pip install tapispy

Install from GitHub checkout:

cd tapispy
python setup.py install
# or #
make install

Contributing

In case you want to contribute, you should read our contributing guidelines and we have a contributor’s guide that explains setting up a development environment and the contribution process.

Quickstart

If you already have an active installation of the TACC Cloud CLI, TapisPy will pick up on your existing credential cache, stored in $HOME/.tapis/current. We illustrate this usage pattern first, as it’s really straightforward.

TACC Cloud CLI

>>> from tapispy.tapis import Tapis
>>> ta = Tapis.restore()

Voila! You have an active, authenticated API client. TapisPy will use a cached refresh token to keep this session active as long as the code is running.

Pure Python

Authentication and authorization to the TACC Cloud APIs uses OAuth2, a widely-adopted web standard. Our implementation of Oauth2 is designed to give you the flexibility you need to script and automate use of TACC Cloud while keeping your access credentials and digital assets secure.

This is covered in great detail in our Developer Documentation but some key concepts will be highlighted here, interleaved with Python code.

The first step is to create a Python object ta which will interact with an Tapis tenant.

>>> from tapispy.tapis import Tapis
>>> ta = Tapis()
CODE                 NAME                                     URL
3dem                 3dem Tenant                              https://api.3dem.org/
agave.prod           Agave Public Tenant                      https://public.agaveapi.co/
araport.org          Araport                                  https://api.araport.org/
designsafe           DesignSafe                               https://agave.designsafe-ci.org/
iplantc.org          CyVerse Science APIs                     https://agave.iplantc.org/
irec                 iReceptor                                https://irec.tenants.prod.tacc.cloud/
sd2e                 SD2E Tenant                              https://api.sd2e.org/
sgci                 Science Gateways Community Institute     https://sgci.tacc.cloud/
tacc.prod            TACC                                     https://api.tacc.utexas.edu/
vdjserver.org        VDJ Server                               https://vdj-agave-api.tacc.utexas.edu/

Please specify the ID of a tenant to interact with: araport.org
>>> ta.api_server
'https://api.araport.org/'

If you already now what tenant you want to work with, you can instantiate Tapis as follows:

>>> from tapispy.tapis import Tapis
>>> ta = Tapis(api_server="https://api.tacc.cloud")

or

>>> from tapispy.tapis import Tapis
>>> ta = Tapis(tenant_id="tacc.prod")

Once the object is instantiated, interact with it according to the API documentation and your specific usage needs.

Create a new Oauth client

In order to interact with Tapis, you’ll need to first create an Oauth client so that later on you can create access tokens to do work.

To create a client you can do the following:

>>> from tapispy.tapis import Tapis
>>> ta = Tapis(api_server='https://api.tacc.cloud')
>>> ta.clients_create("client-name", "some description")
API username: your-username
API password:
>>> ta.api_key
'xxxxxxxxxxxxxxxxxxxxxxxxxxxxx'
>>> ta.api_secret
'XXXXXXXXXXXXXXXXXXXXXXXXXXXXX'

You will use the api key and secret to generate Oauth tokens, which are temporary credentials that you can use in place of putting your real credentials into code that is interacting with TACC APIs.

Reuse an existing Oauth client

Once you generate a client, you can re-use its key and secret. Clients can be created using the Python-based approach illustrated above, via the TACC Cloud CLI clients-create command, or by a direct, correctly-structured POST to the clients web service. No matter how you’ve created a client, setting TapisPy up to use it works the same way:

>>> from tapispy.tapis import Tapis
>>> ta = Tapis(api_server='https://api.tacc.cloud',
...            username='mwvaughn',
...            client_name='my_client',
...            api_key='kV4XLPhVBAv9RTf7a2QyBHhQAXca',
...            api_secret='5EbjEOcyzzIsAAE3vBS7nspVqHQa')

The Tapis object ta is now configured to talk to all TACC Cloud services.

Generate an Access Token

In order to interact with the TACC cloud services in a more secure and controlled manner - without constantly using your username and password - we will use the oauth client, created in the previous step, to generate access tokens.

The generated tokens will by default have a lifetime of 4 hours, or 14400 seconds.

To create a token

>>> ta.get_access_token()
API password:
>>> ta.token
'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'

Keep in mind that you will need to create an oauth client first!

Saving your credentials

To save your process (api key, api secret, access token, refresh token, tenant information) you can use the method Tapis.save_configs()

>>> ta.save_configs()

By default, Tapis.save_configs will store credentials in ~/.tapis. It will save all session in ~/.tapis/config.json and, for backwards-compatibility with other tapis tooling, it will save the current session in ~/.tapis/current.

The refresh token

Nobody likes to change their password, but they have to if it leaks out into the wild. A tragically easy way for that to happen is in committed code or a Docker container where it’s been hard-coded. To get around this, TapisPy works with the TACC authentication APIs to support using a refresh token. Basically, as long as you have the apikey, apisecret, and the last refresh token for an authenticated session, you can renew the session without sending a password. Neat, right? Let’s build on the ta object from above to learn about this.

Let’s start by inspecting its token property, which will also demonstrate how you can access token data programmatically for your own purposes.

>>> ta.token.token_info
{u'access_token': u'14f0bbd0b334e594e676661bf9ccc136', 'created_at':
 1518136421, u'expires_in': 13283, 'expires_at': 'Thu Feb  8 22:15:04',
 u'token_type': u'bearer', 'expiration': 1518149704, u'scope': u'default',
 u'refresh_token': u'b138c49040a6f67f80d49a1c112e44b'}
>>> ta.token.token_info['refresh_token']
u'b138c49046f67f80d49a1c10a12e44b'