dd7a15c0ff
Weed out outdated/unnecessary info and add link to api ref. Change-Id: Ia45c8ad6e2a697d5b76232e17e4df34539d81c12
74 lines
2.8 KiB
ReStructuredText
74 lines
2.8 KiB
ReStructuredText
..
|
|
Copyright 2010-2011 OpenStack LLC
|
|
All Rights Reserved.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License"); you may
|
|
not use this file except in compliance with the License. You may obtain
|
|
a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
License for the specific language governing permissions and limitations
|
|
under the License.
|
|
|
|
Adding a Method to the OpenStack Manila API
|
|
===========================================
|
|
|
|
The interface to manila is a RESTful API. REST stands for Representational
|
|
State Transfer and provides an architecture "style" for distributed systems
|
|
using HTTP for transport. Figure out a way to express your request and
|
|
response in terms of resources that are being created, modified, read, or
|
|
destroyed. Manila's API aims to conform to the `guidelines <http://specs
|
|
.openstack.org/openstack/api-sig/>`_ set by OpenStack API SIG.
|
|
|
|
Routing
|
|
-------
|
|
|
|
To map URLs to controllers+actions, manila uses the Routes package. See
|
|
the `routes package documentation <https://routes.readthedocs.io/en/latest/>`_
|
|
for more information.
|
|
|
|
URLs are mapped to "action" methods on "controller" classes in
|
|
``manila/api/<VERSION>/router.py``.
|
|
|
|
These are two methods of the routes package that are used to perform the
|
|
mapping and the routing:
|
|
|
|
- mapper.connect() lets you map a single URL to a single action on a
|
|
controller.
|
|
- mapper.resource() connects many standard URLs to actions on a controller.
|
|
|
|
Controllers and actions
|
|
-----------------------
|
|
|
|
Controllers live in ``manila/api/v1`` and ``manila/api/v2``.
|
|
|
|
See ``manila/api/v1/shares.py`` for an example.
|
|
|
|
Action methods take parameters that are sucked out of the URL by
|
|
mapper.connect() or .resource(). The first two parameters are self and the
|
|
WebOb request, from which you can get the req.environ, req.body,
|
|
req.headers, etc.
|
|
|
|
Actions return a dictionary, and wsgi.Controller serializes that to JSON.
|
|
|
|
Faults
|
|
------
|
|
|
|
If you need to return a non-200, you should return faults.Fault(webob.exc
|
|
.HTTPNotFound()) replacing the exception as appropriate.
|
|
|
|
Evolving the API
|
|
----------------
|
|
|
|
The ``v1`` version of the manila API has been deprecated. The ``v2`` version
|
|
of the API supports micro versions. So all changes to the v2 API strive to
|
|
maintain stability at any given API micro version, so consumers can safely
|
|
rely on a specific micro version of the API never to change the request and
|
|
response semantics. Read more about :doc:`API Microversions
|
|
<api_microversion_dev>` to understand how stability and backwards
|
|
compatibility are maintained.
|