Experimental Physics and Industrial Control System
Subject: |
Re: sending pickled python objects of epics channel access |
From: |
Andrew Johnson <[email protected]> |
To: |
<[email protected]> |
Date: |
Mon, 15 May 2017 17:24:48 -0500 |
Hi Tim,
On 05/15/2017 05:00 PM, Madden, Timothy J. wrote:
> This is probably a bad idea... But if I were to take a python object,
> call pickle.dumps() to convert it into a string, I
> could then caput it to a waveform record. Then some other py client
> could caget, then call pickle.loads() from the
> waveform record. then we get the object back. So we are sending python
> objects over epics CA.
>
> Has anyone tried this? Seems straightforward. Just how bad an idea is this?
I don't see it as a particularly terrible idea. I wonder if the DØ guys
at Fermilab ever used to do something like this (I do remember Fritz
Bartlett talking about pickling, but the tech-talk archives don't return
anything related).
The obvious limitation of pickling is that you are limiting other users
to writing their code in Python (or in some other language that has a
compatible de/serializing library — Perl's CPAN has such a module called
Python::Serialise::Pickle but it only had one release, in 2003), but
that might not be a problem for some projects. If you were to use a more
generic format such as JSON or YAML you might make life easier for
others, but if you're only expecting this data to ever pass between your
2 clients that shouldn't be a big issue.
- Andrew
--
Arguing for surveillance because you have nothing to hide is no
different than making the claim, "I don't care about freedom of
speech because I have nothing to say." -- Edward Snowdon
- Replies:
- Re: sending pickled python objects of epics channel access Kasemir, Kay
- References:
- sending pickled python objects of epics channel access Madden, Timothy J.
- Navigate by Date:
- Prev:
Re: sending pickled python objects of epics channel access Matt Newville
- Next:
Re: sending pickled python objects of epics channel access Hartman, Steven M.
- Index:
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
<2017>
2018
2019
2020
2021
2022
2023
2024
- Navigate by Thread:
- Prev:
Re: sending pickled python objects of epics channel access Matt Newville
- Next:
Re: sending pickled python objects of epics channel access Kasemir, Kay
- Index:
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
<2017>
2018
2019
2020
2021
2022
2023
2024