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Python Client for Couchbase

Project Description

=======================
Couchbase Python Client
=======================

Client for Couchbase_.

.. note::

This is the documentation for the 2.x version of the client. This is
mostly compatible with the older version. Please refer to the
*release12* branch for the older version.

-----------------------
Building and Installing
-----------------------

This only applies to building from source. If you are using a Windows
installer then everything (other than the server) is already included.
See below for windows snapshot releases.

Also note that these instructions apply to building from source.
You can always get the latest supported release version from pypi_.


If you have a recent version of *pip*, you may use the latest development
version by issuing the following incantation

.. code-block:: sh

pip install git+git://github.com/couchbase/couchbase-python-client

~~~~~~~~~~~~~
Prerequisites
~~~~~~~~~~~~~

- Couchbase Server (http://couchbase.com/download)
- libcouchbase_. version 2.8.0 or greater (Bundled in Windows installer)
- libcouchbase development files.
- Python development files
- A C compiler.

~~~~~~~~
Building
~~~~~~~~

The following will compile the module locally; you can then test basic
functionality including running the examples.

.. code-block:: sh

python setup.py build_ext --inplace


If your libcouchbase install is in an alternate location (for example,
`/opt/local/libcouchbase`), you may add extra directives, like so

.. code-block:: sh

python setup.py build_ext --inplace \
--library-dir /opt/local/libcouchbase/lib \
--include-dir /opt/local/libcouchbase/include

Or you can modify the environment ``CFLAGS`` and ``LDFLAGS`` variables.


.. warning::

If you do not intend to install this module, ensure you set the
``PYTHONPATH`` environment variable to this directory before running
any scripts depending on it. Failing to do so may result in your script
running against an older version of this module (if installed), or
throwing an exception stating that the ``couchbase`` module could not
be found.


^^^^^^^^^^
Installing
^^^^^^^^^^
.. code-block:: sh

python setup.py install

-----
Using
-----

Authentication is handled differently depending on what version of Couchbase Server
you are using:

~~~~~~~~~~~~~~~~~~~~~~
Couchbase Server < 5.0
~~~~~~~~~~~~~~~~~~~~~~
Each bucket can optionally have a password. You may omit the authenticator if you
are only working with password-less buckets.

.. code-block:: pycon

>>> from couchbase.cluster import Cluster, ClassicAuthenticator
>>> cluster = Cluster('couchbase://localhost')
>>> cluster.authenticate(ClassicAuthenticator(buckets={'bucket-name': 'password'}))
>>> bucket = cluster.open_bucket('bucket-name')

~~~~~~~~~~~~~~~~~~~~~~~
Couchbase Server >= 5.0
~~~~~~~~~~~~~~~~~~~~~~~
Role-Based Access Control (RBAC) provides discrete username and passwords for an
application that allow fine-grained control. The authenticator is always required.

.. code-block:: pycon

>>> from couchbase.cluster import Cluster, PasswordAuthenticator
>>> cluster = Cluster('couchbase://localhost')
>>> cluster.authenticate(PasswordAuthenticator('username', 'password'))
>>> bucket = cluster.open_bucket('bucket-name')

Here's an example code snippet which sets a key and then reads it

.. code-block:: pycon

>>> bucket.upsert("key", "value")
OperationResult<RC=0x0, Key=key, CAS=0x31c0e3f3fc4b0000>
>>> res = bucket.get("key")
>>> res
ValueResult<RC=0x0, Key=key, Value=u'value', CAS=0x31c0e3f3fc4b0000, Flags=0x0>
>>> res.value
u'value'
>>>

You can also use views

.. code-block:: pycon

>>> resultset = bucket.query("beer", "brewery_beers", limit=5)
>>> resultset
View<Design=beer, View=brewery_beers, Query=Query:'limit=5', Rows Fetched=0>
>>> for row in resultset: print row.key
...
[u'21st_amendment_brewery_cafe']
[u'21st_amendment_brewery_cafe', u'21st_amendment_brewery_cafe-21a_ipa']
[u'21st_amendment_brewery_cafe', u'21st_amendment_brewery_cafe-563_stout']
[u'21st_amendment_brewery_cafe', u'21st_amendment_brewery_cafe-amendment_pale_ale']
[u'21st_amendment_brewery_cafe', u'21st_amendment_brewery_cafe-bitter_american']

~~~~~~~~~~~
Twisted API
~~~~~~~~~~~

The Python client now has support for the Twisted async network framework.
To use with Twisted, simply import ``txcouchbase.connection`` instead of
``couchbase.bucket``

.. code-block:: python

from twisted.internet import reactor
from txcouchbase.bucket import Bucket

cb = Bucket('couchbase://localhost/default')
def on_upsert(ret):
print "Set key. Result", ret

def on_get(ret):
print "Got key. Result", ret
reactor.stop()

cb.upsert("key", "value").addCallback(on_upsert)
cb.get("key").addCallback(on_get)
reactor.run()

# Output:
# Set key. Result OperationResult<RC=0x0, Key=key, CAS=0x9a78cf56c08c0500>
# Got key. Result ValueResult<RC=0x0, Key=key, Value=u'value', CAS=0x9a78cf56c08c0500, Flags=0x0>


The ``txcouchbase`` API is identical to the ``couchbase`` API, except that where
the synchronous API will block until it receives a result, the async API will
return a `Deferred` which will be called later with the result or an appropriate
error.

~~~~~~~~~~
GEvent API
~~~~~~~~~~

.. code-block:: python

from gcouchbase.bucket import Bucket

conn = Bucket('couchbase://localhost/default')
print conn.upsert("foo", "bar")
print conn.get("foo")

The API functions exactly like the normal Bucket API, except that the
implementation is significantly different.

------------------------
Asynchronous (Tulip) API
------------------------

This module also supports Python 3.4/3.5 asynchronous I/O. To use this
functionality, import the `couchbase.experimental` module (since this
functionality is considered experimental) and then import the `acouchbase`
module. The `acouchbase` module offers an API similar to the synchronous
client:

.. code-block:: python

import asyncio

import couchbase.experimental
couchbase.experimental.enable()
from acouchbase.bucket import Bucket


async def write_and_read(key, value):
cb = Bucket('couchbase://10.0.0.31/default')
await cb.connect()
await cb.upsert(key, value)
return await cb.get(key)

loop = asyncio.get_event_loop()
rv = loop.run_until_complete(write_and_read('foo', 'bar'))
print(rv.value)


~~~~
PyPy
~~~~

`PyPy <http://pypy.org>`_ is an alternative high performance Python
implementation. Since PyPy does not work well with C extension modules,
this module will not work directly. You may refer to the alternate
implementation based on the *cffi* module: https://github.com/couchbaselabs/couchbase-python-cffi

~~~~~~~~~~~~~~
Other Examples
~~~~~~~~~~~~~~

There are other examples in the `examples` directory. To run them from the
source tree, do something like

.. code-block:: sh

PYTHONPATH=$PWD ./examples/bench.py -U couchbase://localhost/default

----------------------
Building documentation
----------------------


The documentation is using Sphinx and also needs the numpydoc Sphinx extension.
In order for the documentation to build properly, the C extension must have
been built, since there are embedded docstrings in there as well.

To build the documentation, go into the `docs` directory and run

.. code-block:: sh

make html

The HTML output can be found in `docs/build/html/`.


Alternatively, you can also build the documentation (after building the module
itself) from the top-level directory:

.. code-block:: sh

python setup.py build_sphinx

Once built, the docs will be in in `build/sphinx/html`

-------
Testing
-------

For running the tests, you need the standard `unittest` module, shipped
with Python. Additionally, the `testresources` package is required.

To run them, use either `py.test`, `unittest` or `trial`.

The tests need a running Couchbase instance. For this, a `tests.ini`
file must be present, containing various connection parameters.
An example of this file may be found in `tests.ini.sample`.
You may copy this file to `tests.ini` and modify the values as needed.

The simplest way to run the tests is to declare a `bucket_prefix` in
the `tests.ini` file and run the `setup_tests.py` script to create
them for you.

.. code-block:: sh

python setup_tests.py

To run the tests::

nosetests

------------------------------
Support & Additional Resources
------------------------------

If you found an issue, please file it in our JIRA_.
You can ask questions in our forums_ or in the `#libcouchbase` channel on
freenode_.

The `official documentation`_ can be consulted as well for
general Couchbase concepts and offers a more didactic approach to using the
SDK.

-------
License
-------

The Couchbase Python SDK is licensed under the Apache License 2.0.

.. _Couchbase: http://couchbase.com
.. _libcouchbase: http://developer.couchbase.com/documentation/server/4.5/sdk/c/start-using-sdk.html
.. _official documentation: http://developer.couchbase.com/documentation/server/4.5/sdk/python/start-using-sdk.html
.. _JIRA: http://couchbase.com/issues/browse/pycbc
.. _freenode: http://freenode.net/irc_servers.shtml
.. _pypi: http://pypi.python.org/pypi/couchbase
.. _forums: https://forums.couchbase.com

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