aiodns
Simple DNS resolver for asyncio
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README:
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aiodns provides a simple way for doing asynchronous DNS resolutions using pycares <https://github.com/saghul/pycares>_.
.. code:: python
import asyncio
import aiodns
loop = asyncio.get_event_loop()
resolver = aiodns.DNSResolver(loop=loop)
async def query(name, query_type):
return await resolver.query(name, query_type)
coro = query('google.com', 'A')
result = loop.run_until_complete(coro)
The following query types are supported: A, AAAA, ANY, CAA, CNAME, MX, NAPTR, NS, PTR, SOA, SRV, TXT.
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 ofasyncio.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 thedocumentation <http://pycares.readthedocs.org/en/latest/channel.html#pycares.Channel.query>_ 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). Whilequery()always performs a request to a DNS server,gethostbyname()first looks into/etc/hostsand thus can resolve local hostnames (such aslocalhost). Please checkthe documentation <http://pycares.readthedocs.io/en/latest/channel.html#pycares.Channel.gethostbyname>_ for the result fields. The actual result of the call is aasyncio.Future. -
gethostbyaddr(name): Make a reverse lookup for an address. -
cancel(): Cancel all pending DNS queries. All futures will getDNSErrorexception set, withARES_ECANCELLEDerrno.
This library requires the asyncio loop to be a SelectorEventLoop, which is not the default on Windows.
The default can be changed as follows (do this very early in your application):
.. code:: python
asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
This may have other implications for the rest of your codebase, so make sure to test thoroughly.
To run the test suite: python tests.py
Saúl Ibarra Corretgé [email protected]
aiodns uses the MIT license, check LICENSE file.
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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