Re: [pysnmp-dev] Regarding use of Dispatcher with Multiprocessing

[Ani A <ani...@gm...>]

Hi Ilya,

I am trying to create something like a _proxy_, the goal is to be able to
intercept traps from the local
SNMP Agent, and then peeking into the varbinds, decide which one of the
remote trap-receivers to send to.

Traps are the first goal, then, for Informs, I need to be able to get the
ack, and send it back to the main agent as well.

Since I am using Multiprocessing module [1], do I still have to worry about
MT safe?

(the networking part of this, is that the receivers are all on different
networks
 [ different Linux namespaces ], so I have to get the SNMP payload and then
build a separate UDP packet and
send, unless there is an easier way/API that I can use to just change the
IP and send)

Hope I explained the problem [that I am trying to solve], clearly. Any
help/tips/guidance very much welcome.


[1] https://docs.python.org/2/library/multiprocessing.html

--
Ani


On Fri, Feb 27, 2015 at 1:09 AM, Ilya Etingof <il...@gl...> wrote:

> Hi Ani,
>
> At what point you are going to employ threading? Just for SNMP receiving
> part (what is not easy since a single instance of SNMP engine is not
> MT-safe) or for some sort of custom processing logic beyond SNMP engine?
>
> -ilya
>
> > On 24 Feb 2015, at 09:44, Ani A <ani...@gm...> wrote:
> >
> > Hello,
> >
> > I was running through the examples in pysnmp (for Trap receiver with V3
> case)
> > and I have a few doubts (maybe trivial! but somehow I am not getting it)
> >
> > I want to use pysnmp, with Python's Multiprocessing module, so in
> > each Process's callback function, do I run the following ?
> >
> >    try:
> >        snmpEngine.transportDispatcher.runDispatcher()
> >    except:
> >        snmpEngine.transportDispatcher.closeDispatcher()
> >        raise
> >
> > i.e, what should my main-loop wait on? , since I have another Queue as
> well
> > which I need to check.
> >
> > Thanks.
> > —
> > Ani
>
>