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About
-----
Restkit is an HTTP resource kit for `Python <http://python.org>`_. It allows you to easily access to HTTP resource and build objects around it. It's the base of `couchdbkit <http://www.couchdbkit.org>`_ a Python `CouchDB <http://couchdb.org>`_ framework.
Restkit is a full HTTP client using pure socket calls and its own HTTP parser. It's not based on httplib or urllib2.
Installation
------------
Restkit requires Python 2.x superior to 2.5.
Install from sources::
$ python setup.py install
Or from Pypi::
$ easy_install -U restkit
Usage
=====
Perform HTTP call support with `restkit.request`.
++++++++++++++++++++++++++++++++++++++++++++++++++
Usage example, get friendpaste page::
from restkit import request
resp = request('http://friendpaste.com')
print resp.body_string()
print resp.status_int
Create a simple Twitter Search resource
+++++++++++++++++++++++++++++++++++++++
Building a resource object is easy using `restkit.Resource` class. We use `simplejson <http://code.google.com/p/simplejson/>`_ to handle deserialisation of data.
Here is the snippet::
from restkit import Resource
try:
import simplejson as json
except ImportError:
import json # py2.6 only
class TwitterSearch(Resource):
def __init__(self, pool_instance=None, **kwargs):
search_url = "http://search.twitter.com"
super(TwitterSearch, self).__init__(search_url, follow_redirect=True,
max_follow_redirect=10,
pool_instance=pool_instance,
**kwargs)
def search(self, query):
return self.get('search.json', q=query)
def request(self, *args, **kwargs):
resp = super(TwitterSearch, self).request(*args, **kwargs)
return json.loads(resp.body)
if __name__ == "__main__":
s = TwitterSearch()
print s.search("gunicorn")
Reuses connections
------------------
Reusing connections is good. Restkit can maintain for you the http connections and reuse them if the server allows it. To do that you can pass to any object a pool instance inheriting `reskit.pool.PoolInterface`. You can use our threadsafe pool in any application::
from restkit import Resource, SimplePool
pool = SimplePool(keepalive=2)
res = Resource('http://friendpaste.com', pool_instance=pool)
or if you use Eventlet::
import eventlet
eventlet.monkey_patch(all=False, socket=True, select=True)
from restkit import Resource
from restkit.pool.reventlet import EventletPool
pool = EventletPool(keepalive=2, timeout=300)
res = Resource('http://friendpaste.com', pool_instance=pool)
Using `eventlet <http://eventlet.net>`_ pool is definitely better since it allows you to define a timeout for connections. When timeout is reached and the connection is still in the pool, it will be closed.
Authentication
==============
Restkit support for now `basic authentication`_ and `OAuth`_. But any
other authentication schema can easily be added using http filters.
Basic authentication
++++++++++++++++++++
To use `basic authentication` in a `Resource object` you can do::
from restkit import Resource, BasicAuth
auth = BasicAuth("username", "password")
r = Resource("http://friendpaste.com", filters=[auth])
Or simply use an authentication url::
r = Resource("http://username:password@friendpaste.com")
.. _basic authentification: http://www.ietf.org/rfc/rfc2617.txt
.. _OAuth: http://oauth.net/
OAuth
+++++
Restkit OAuth is based on `simplegeo python-oauth2 module <http://github.com/simplegeo/python-oauth2>`_ So you don't need other installation to use OAuth (you can also simply use `restkit.oauth2` module in your applications).
The OAuth filter `restkit.oauth2.filter.OAuthFilter` allow you to associate a consumer per resource (path). Initalize Oauth filter with::
path, consumer, token, signaturemethod
`token` and `method signature` are optionnals. Consumer should be an instance of `restkit.oauth2.Consumer`, token an instance of `restkit.oauth2.Token` signature method an instance of `oauth2.SignatureMethod` (`restkit.oauth2.Token` is only needed for three-legged requests.
The filter is appleid if the path match. It allows you to maintain different authorization per path. A wildcard at the indicate to the filter to match all path behind.
Example the rule `/some/resource/*` will match `/some/resource/other` and `/some/resource/other2`, while the rule `/some/resource` will only match the path `/some/resource`.
Simple client example:
~~~~~~~~~~~~~~~~~~~~~~
::
from restkit import OAuthFilter, request
import restkit.oauth2 as oauth
# Create your consumer with the proper key/secret.
consumer = oauth.Consumer(key="your-twitter-consumer-key",
secret="your-twitter-consumer-secret")
# Request token URL for Twitter.
request_token_url = "http://twitter.com/oauth/request_token"
# Create our filter.
auth = oauth.OAuthFilter('*', consumer)
# The request.
resp = request(request_token_url, filters=[auth])
print resp.body_string()
If you want to add OAuth to your `TwitterSearch` resource::
# Create your consumer with the proper key/secret.
consumer = oauth.Consumer(key="your-twitter-consumer-key",
secret="your-twitter-consumer-secret")
# Create our filter.
client = oauth.OAuthfilter('*', consumer)
s = TwitterSearch(filters=[client])
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