Synnefo

.. _astakosclient:

Component astakosclient

^^^^^^^^^^^^^^^^^^^^^^^^^^^^

The Synnefo component :ref:`astakosclient <astakosclient>` defines a

default client for the :ref:`Astakos <astakos>` service. It is designed to be

simple and minimal, hence easy to debug and test.

It uses the user's authentication token to query Astakos for:

    * User's info

    * Usernames for given UUIDs

    * UUIDs for given usernames

    * User's quotas

It can also query Astakos with another service's (Cyclades or Pithos)

authentication token for:

    * Usernames for given UUIDs

    * UUIDs for given usernames

    * Issue commissions

    * Get pending commissions

    * Accept or reject commissions

Additionally, there are options for using the `objpool

<https://github.com/grnet/objpool>`_ library to pool the http connections.

Basic example

=============

The ``astakosclient`` module provides the ``AstakosClient`` class. This section

demonstrates how to get user's info using ``astakosclient``.

.. code-block:: python

    from astakosclient import AstakosClient

    client = AstakosClient("https://accounts.example.com")

    user_info = client.get_user_info("UQpYas7ElzWGD5yCcEXtjw==")

    print user_info['username']

Another example where we ask for the username of a user with UUID:

``b3de8eb0-3958-477e-als9-789af8dd352c``

.. code-block:: python

    from astakosclient import AstakosClient

    client = AstakosClient("https://accounts.example.com")

    username = client.get_username("UQpYas7ElzWGD5yCcEXtjw==",

                                   "b3de8eb0-3958-477e-als9-789af8dd352c")

    print username

Classes and functions

=====================

This section describes in depth the API of ``astakosclient``.

Astakos Client

--------------

*class* astakosclient.\ **AstakosClient(**\ astakos_url,

retry=0, use_pool=False, pool_size=8, logger=None\ **)**

    Initialize an instance of **AstakosClient** given the *astakos_url*.

    Optionally one can specify if we are going to use a pool, the pool_size

    and the number of retries if the connection fails.

    This class provides the following methods:

    **get_user_info(**\ token, usage=False\ **)**

        Given a user's authentication token it returns a dict with the

        correspoinding user's info. If usage is set to True more

        information about user's resources will be returned.

        In case of error raise an AstakosClientException exception.

    **get_usernames(**\ token, uuids\ **)**

        Given a user's authentication token and a list of UUIDs

        return a uuid_catalog, that is a dictionary with the given

        UUIDs as keys and the corresponding user names as values.

        Invalid UUIDs will not be in the dictionary.

        In case of error raise an AstakosClientException exception.

    **get_username(**\ token, uuid\ **)**

        Given a user's authentication token and a UUID (as string)

        return the corresponding user name (as string).

        In case of invalid UUID raise NoUserName exception.

        In case of error raise an AstakosClientException exception.

    **service_get_usernames(**\ token, uuids\ **)**

        Same as get_usernames but called with a service's token.

    **service_get_username(**\ token, uuid\ **)**

        Same as get_username but called with a service's token.

    **get_uuids(**\ token, display_names\ **)**

        Given a user's authentication token and a list of usernames

        return a displayname_catalog, that is a dictionary with the given

        usernames as keys and the corresponding UUIDs as values.

        Invalid usernames will not be in the dictionary.

        In case of error raise an AstakosClientException exception.

    **get_uuid(**\ token, display_name\ **)**

        Given a user's authentication token and a username (as string)

        return the corresponding UUID (as string).

        In case of invalid user name raise NoUUID exception.

        In case of error raise an AstakosClientException exception.

    **service_get_uuids(**\ token, uuids\ **)**

        Same as get_uuids but called with a service's token.

    **service_get_uuid(**\ token, uuid\ **)**

        Same as get_uuid but called with a service's token.

    **get_services()**

        Return a list of dicts with the registered services.

    **get_resources()**

        Return a list of dicts with the available resources

    **get_quotas(**\ token\ **)**

        Given a user's authentication token return user's

        current quotas (as dict of dicts).

        In case of error raise an AstakosClientException exception.

    **issue_commission(**\ token, request\ **)**

        Given a service's authentication token issue a commission.

        In case of success return commission's id (int).

        Otherwise raise an AstakosClientException exception.

    **issue_one_commission(**\ token, holder, source, provisions, force=False, auto_accept=False\ **)**

        Given a service's authentication token issue a commission.

        In this case we specify the holder, the source and the provisions

        (a list of (string, int)) and astakosclient will create the

        corresponding commission.

        In case of success return commission's id (int).

        Otherwise raise an AstakosClientException exception.

    **get_pending_commissions(**\ token\ **)**

        Given a service's authentication token return the pending

        commissions (list of integers).

        In case of error raise an AstakosClientException exception.

    **get_commission_info(**\ token, serial\ **)**

        Given a service's authentication token and the id of a

        pending commission return a dict of dicts containting

        informations (details) about the requested commission.

        In case of error raise an AstakosClientException exception.

    **commission_action(**\ token, serial, action\ **)**

        Given a service's authentication token and the id of a

        pending commission, request the specified action (currently

        one of accept, reject).

        In case of success returns nothing.

        Otherwise raise an AstakosClientException exception.

    **accept_commission(**\ token, serial\ **)**

        Accept a pending commission (see commission_action).

    **reject_commission(**\ token, serial\ **)**

        Reject a pending commission (see commission_action).

    **resolve_commissions(**\ token, accept_serials, reject_serials\ **)**

        Accept or Reject many pending commissions at once.

        In case of success return a dict of dicts describing which

        commissions accepted, which rejected and which failed to

        resolved.

        Otherwise raise an AstakosClientException exception.

Public Functions

----------------

**get_token_from_cookie(**\ request, cookie_name\ **)**

    Given a Django request object and an Astakos cookie name

    extract the user's token from it.

Exceptions and Errors

=====================

*exception* **AstakosClientException**

    Raised in case of an error. It contains an error message and the

    corresponding http status code. Other exceptions raised by

    astakosclient module are derived from this one.

*exception* **BadValue**

    A redefinition of ValueError exception under AstakosClientException.

*exception* **InvalidResponse**

    This exception is raised whenever the server's response is not

    valid json (cannot be parsed by simplejson library).

*exception* **BadRequest**

    Raised in case of a Bad Request, with status 400.

*exception* **Unauthorized**

    Raised in case of Invalid token (unauthorized access), with status 401.

*exception* **Forbidden**

    The server understood the request, but is refusing to fulfill it.

    Status 401.

*exception* **NotFound**

    The server has not found anything matching the Request-URI. Status 404.

*exception* **QuotaLimit**

    Quantity fell below zero or exceeded capacity in one of the holdings.

*exception* **NoUserName**

    Raised by getDisplayName and getServiceDisplayName when an invalid

    UUID was given.

*exception* **NoUUID**

    Raised by *getUUID* and *getServiceUUID* when an invalid

    username was given.