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Re: asyncio - run coroutine in the background

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Hello there,

I realize that this discussion of supporting asynchronous name 
lookup requests in DNS is merely a detour in this thread on asyncio, 
but I couldn't resist mentioning an existing tool.

>> getaddrinfo is a notorious pain but I think it's just a library 
>> issue; an async version should be possible in principle.  How 
>> does Twisted handle it?  Does it have a version?
>
>In a (non-Python) program of mine, I got annoyed by synchronous 
>name lookups, so I hacked around it: instead of using the regular 
>library functions, I just do a DNS lookup directly (which can then 
>be event-based - send a UDP packet, get notified when a UDP packet 
>arrives). Downside: Ignores /etc/nsswitch.conf and /etc/hosts, and 
>goes straight to the name server. Upside: Is able to do its own 
>caching, since the DNS library gives me the TTLs, but 
>gethostbyname/getaddrinfo won't.

Another (non-Python) DNS name lookup library that does practically 
the same thing (along with the shortcomingsn you mentioned, Chris: 
no NSS nor /etc/hosts) is the adns library.  Well, it is DNS, after 
all.

  http://www.gnu.org/software/adns/
  https://pypi.python.org/pypi/adns-python/1.2.1

And, there are Python bindings.  I have been quite happy using the 
adns tools (and tools built on the Python bindings) for mass lookups 
(millions of DNS names).  It works very nicely.

Just sharing knowledge of an existing tool,

-Martin

-- 
Martin A. Brown
http://linux-ip.net/

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Thread

asyncio - run coroutine in the background "Frank Millman" <frank@chagford.com> - 2016-02-15 08:35 +0200
  Re: asyncio - run coroutine in the background Marko Rauhamaa <marko@pacujo.net> - 2016-02-15 08:54 +0200
    Re: asyncio - run coroutine in the background "Frank Millman" <frank@chagford.com> - 2016-02-15 09:16 +0200
      Re: asyncio - run coroutine in the background Marko Rauhamaa <marko@pacujo.net> - 2016-02-15 09:34 +0200
      Re: asyncio - run coroutine in the background Paul Rubin <no.email@nospam.invalid> - 2016-02-14 23:39 -0800
        Re: asyncio - run coroutine in the background "Frank Millman" <frank@chagford.com> - 2016-02-15 10:17 +0200
        Re: asyncio - run coroutine in the background Marko Rauhamaa <marko@pacujo.net> - 2016-02-15 13:05 +0200
        Re: asyncio - run coroutine in the background Chris Angelico <rosuav@gmail.com> - 2016-02-16 16:51 +1100
        Re: asyncio - run coroutine in the background Kevin Conway <kevinjacobconway@gmail.com> - 2016-02-16 13:22 +0000
          Re: asyncio - run coroutine in the background Marko Rauhamaa <marko@pacujo.net> - 2016-02-16 16:17 +0200
            Re: asyncio - run coroutine in the background "Frank Millman" <frank@chagford.com> - 2016-02-16 16:36 +0200
            Re: asyncio - run coroutine in the background Kevin Conway <kevinjacobconway@gmail.com> - 2016-02-16 14:54 +0000
            Re: asyncio - run coroutine in the background Steven D'Aprano <steve@pearwood.info> - 2016-02-17 02:17 +1100
              Re: asyncio - run coroutine in the background Marko Rauhamaa <marko@pacujo.net> - 2016-02-16 19:12 +0200
                Re: asyncio - run coroutine in the background Paul Rubin <no.email@nospam.invalid> - 2016-02-17 20:38 -0800
                Re: asyncio - run coroutine in the background Marko Rauhamaa <marko@pacujo.net> - 2016-02-18 08:10 +0200
              Re: asyncio - run coroutine in the background Marko Rauhamaa <marko@pacujo.net> - 2016-02-16 19:13 +0200
              Re: asyncio - run coroutine in the background Marko Rauhamaa <marko@pacujo.net> - 2016-02-16 19:14 +0200
              Re: asyncio - run coroutine in the background Marko Rauhamaa <marko@pacujo.net> - 2016-02-16 19:15 +0200
                Re: asyncio - run coroutine in the background Marko Rauhamaa <marko@pacujo.net> - 2016-02-16 19:15 +0200
                Re: asyncio - run coroutine in the background Robin Becker <robin@reportlab.com> - 2016-02-16 17:52 +0000
            Re: asyncio - run coroutine in the background "Frank Millman" <frank@chagford.com> - 2016-02-16 17:21 +0200
              Re: asyncio - run coroutine in the background Marko Rauhamaa <marko@pacujo.net> - 2016-02-16 19:20 +0200
                Re: asyncio - run coroutine in the background Paul Rubin <no.email@nospam.invalid> - 2016-02-19 23:40 -0800
                Re: asyncio - run coroutine in the background Marko Rauhamaa <marko@pacujo.net> - 2016-02-20 10:13 +0200
                Re: asyncio - run coroutine in the background Paul Rubin <no.email@nospam.invalid> - 2016-02-20 00:37 -0800
                Re: asyncio - run coroutine in the background Chris Angelico <rosuav@gmail.com> - 2016-02-20 19:52 +1100
                Re: asyncio - run coroutine in the background Marko Rauhamaa <marko@pacujo.net> - 2016-02-20 10:59 +0200
                Re: asyncio - run coroutine in the background Chris Angelico <rosuav@gmail.com> - 2016-02-20 20:02 +1100
                Re: asyncio - run coroutine in the background Marko Rauhamaa <marko@pacujo.net> - 2016-02-20 11:28 +0200
                Re: asyncio - run coroutine in the background Kevin Conway <kevinjacobconway@gmail.com> - 2016-02-20 13:52 +0000
                Re: asyncio - run coroutine in the background "Martin A. Brown" <martin@linux-ip.net> - 2016-02-20 09:45 -0800
                Re: asyncio - run coroutine in the background Chris Angelico <rosuav@gmail.com> - 2016-02-21 08:47 +1100
            Re: asyncio - run coroutine in the background Chris Angelico <rosuav@gmail.com> - 2016-02-17 02:28 +1100
            Re: asyncio - run coroutine in the background "Frank Millman" <frank@chagford.com> - 2016-02-16 17:45 +0200
        Re: asyncio - run coroutine in the background "Frank Millman" <frank@chagford.com> - 2016-02-16 15:52 +0200

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