Skip to main content

Simple DNS resolver for asyncio

Project description

Simple DNS resolver for asyncio

.. image::

aiodns provides a simple way for doing asynchronous DNS resolutions
with a synchronous looking interface by using `pycares <>`_.



import asyncio
import aiodns

loop = asyncio.get_event_loop()
resolver = aiodns.DNSResolver(loop=loop)
f = resolver.query('','A')
result = loop.run_until_complete(f)

The following query types are supported: A, AAAA, CNAME, MX, NAPTR, NS, PTR, SOA, SRV, TXT.

The library supports both *asyncio* and *Trollius*.

If you use Python 3 you may use `yield from` statement::

def func():
result = yield from resolver.query('','A')

For Trollius you should use another syntax like::

def func():
result = yield trollius.From(resolver.query('','A'))


The API is pretty simple, three functions are provided in the ``DNSResolver`` class:

* ``query(host, type)``: Do a DNS resolution of the given type for the given hostname. It returns an
instance of ``asyncio.Future``. The actual result of the DNS query is taken directly from pycares.
As of version 1.0.0 of aiodns (and pycares, for that matter) results are always namedtuple-like
objects with different attributes. Please check `the documentation <>`_
for the result fields.
* ``gethostbyname(host, socket_family)``: Do a DNS resolution for the given
hostname and the desired type of address family (i.e. ``socket.AF_INET``).
While ``query()`` always performs a request to a DNS server,
``gethostbyname()`` first looks into ``/etc/hosts`` and thus can resolve
local hostnames (such as ``localhost``). Please check `the documentation
for the result fields. The actual result of the call is a ``asyncio.Future``.
* ``cancel()``: Cancel all pending DNS queries. All futures will get ``DNSError`` exception set, with

Running the test suite

To run the test suite: ``python``


Saúl Ibarra Corretgé <>


aiodns uses the MIT license, check LICENSE file.

Python versions

Python >= 3.4 is natively supported. Python 3.3 supported using the `asyncio package <>`_.
Older Python versions(2.6 - 3.2) are supported using `trollius <>`_.


If you'd like to contribute, fork the project, make a patch and send a pull
request. Have a look at the surrounding code and please, make yours look
alike :-)

Project details

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Filename, size & hash SHA256 hash help File type Python version Upload date
aiodns-1.1.1-py2.py3-none-any.whl (6.4 kB) Copy SHA256 hash SHA256 Wheel py2.py3
aiodns-1.1.1.tar.gz (6.1 kB) Copy SHA256 hash SHA256 Source None

Supported by

Elastic Elastic Search Pingdom Pingdom Monitoring Google Google BigQuery Sentry Sentry Error logging AWS AWS Cloud computing DataDog DataDog Monitoring Fastly Fastly CDN SignalFx SignalFx Supporter DigiCert DigiCert EV certificate StatusPage StatusPage Status page