[Twisted-Python] SNMPProtocol, request for review...

Andrew Bennetts andrew-twisted at puzzling.org
Sun Nov 2 17:20:27 EST 2003

On Sun, Nov 02, 2003 at 01:56:15PM -0500, Mike C. Fletcher wrote:
> I'm particularly interested in:
>    * whether the timeouts are handled properly (we do a crude callLater
>      and check for deferred.called for them), is there a more elegant
>      Twisted mechanism for handling timed-out operations?

I haven't yet looked at your code, but there is a .setTimeout method on
Deferreds that sounds applicable here.  By default it will errback your
deferred with a defer.TimeoutError, but you can pass in a custom timeoutFunc
if necessary.

One thing to watch out for when using setTimeout is that you need to wrap
your calls to d.callback/d.errback in try/except defer.AlreadyCalledError,
in case the timeout does happen (alternatively you could pass in a
timeoutFunc that arranges for whatever would call callback/errback to be
cancelled, but that might be harder).  This is probably already the case
with your existing timeouts, though.

>    * whether the message IDs are handled properly (we just store all
>      "live" messages in a dictionary and delete them when they are
>      timed out or responded to), is there some more elegant Twisted
>      solution?

Again, I haven't looked at your code, but that sounds ok to me :)


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