Simple DNS resolver for asyncio
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('google.com','A') result = loop.run_until_complete(f) print(result)
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:
@asyncio.coroutine def func(): result = yield from resolver.query('google.com','A')
For Trollius you should use another syntax like:
@trollius.coroutine def func(): result = yield trollius.From(resolver.query('google.com','A'))
The API is pretty simple, two 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.
cancel(): Cancel all pending DNS queries. All futures will get DNSError exception set, with ARES_ECANCELLED errno.
Running the test suite
To run the test suite: python test_aiodns.py
aiodns uses the MIT license, check LICENSE file.
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 :-)
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