Re: Non-blocking publishing in Python

Adam:

> The question was not bone-headed at all. It's just that sometimes our
> Python guy goes into  { while 1: sleep } mode. ;)

In that case, I'll continue to poll() the list. Hopefully the results are=
n't too
asynchronous!


> Both of those client libraries were experimental prototypes, as is
> probably clear from reading the source. Plus, I was kind of learning
> Python as we wrote them.
>=20
> I'm Cc'ing Ben in case he knows the answer to your embedding question.

So is anyone using the Python clients for any interesting applications? I=
've
evaluated some other asynchronous messaging technologies, and mod/re-pubs=
ub
looks the most promising w.r.t. Python and Internet-wide messaging. It wo=
uld be
great if anyone could share some insight into the embedding question, or =
how to
harness the non-blocking behavior of the pubsublib.


> I do know that no one is currently working to port the client library
> to Twisted; right now all the energy and effort is going into
> rewriting the server using Twisted, and hopefully we can learn from
> that to do a client rewrite sometime later. If you're feeling
> ambitious, feel free to take a crack at doing it with Twisted's
> Deferred mechanism...

How is the progress on the server side? Is the current version stable eno=
ugh to
be making changes that would be compatible with the current server develo=
pment?
I have some experience with Twisted, so I wouldn't mind taking a look, bu=
t I
would like to get a sense of the project road map so my work isn't wasted=
.

>    -- Adam

Brian


PS Are you Adam Rifkin or another Adam?


> On Apr 5, 2005 4:13 AM,
> [email protected]
> <[email protected]> wrote:
> > Haven't heard anything back from the list regarding this question. If=
 it
> is
> > because the question was too bone-headed, then there is no remedy.
> Otherwise,
> > the following information might be useful to someone else getting sta=
rted.
> >=20
> > There are two python client libraries: pubsublib.py and libkn/libkn.p=
y.
> > According to the source, pubsublib.py is a non-blocking implementatio=
n,
> while
> > libkn.py is blocking. The examples in apps are built off of pubsublib=
, so
> they
> > should be non-blocking.
> >=20
> > This seems to be true when running as a standalone script, but what a=
bout
> when I
> > want to embed? Is the logging package being used to help the debuggin=
g
> process
> > or are people using pdb?
> >=20
> > Also, I read somewhere that the client is supposed to be using Twiste=
d in
> the
> > near future. Is this still the case, and if so, what's the progress o=
n it?
> >=20
> > Thanks,
> > Brian
> >=20
> >=20
> > Quoting [email protected]:
> >=20
> > > Hello:
> > >
> > > I'm trying to use the apps/publish.py module as a starting point fo=
r
> writing
> > > my
> > > own simple publishing lib to work with repubsub. The script runs fi=
ne on
> its
> > > own, but whenever I try to embed it in other code, I seem to get
> blocking
> > > issues and the CPU load spikes.
> > >
> > > Inside the apps/publish.py script, I looked at the following method
> calls:
> > >
> > >   asyncore.poll()
> > >   scheduler.timeout()
> > >   scheduler.run()
> > >
> > > Now Python's asyncore does not have documentation on the poll funct=
ion,
> > > although
> > > in my interpreter, I do see a reference for poll. The two scheduler
> function
> > > calls both pass in their implementations. If I comment out that loo=
p, my
> > > messages don't get published. So what's going on here?
> > >
> > > Ideally, I'd like to be able to use Twisted's Deferred mechanism to
> handle
> > > the
> > > blocking issue, but I'm unsure the best way to approach it without
> heavily
> > > modifying the code base.
> > >
> > > Any help is greatly appreciated.
> > >
> > > Thanks,
> > > Brian
> > >
> > > --
> > >   =3D=3D=3D=3D
> > > brian lee dae yung
> > > biomimetic art and research
> > >   mux space . com
> > >
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> >=20
> > --
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> > brian lee dae yung
> > biomimetic art and research
> >   mux space . com
> >=20
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>=20
>=20
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>=20


--=20
  =3D=3D=3D=3D
brian lee dae yung
biomimetic art and research
  mux space . com

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