Experimental Physics and
Industrial Control System

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<== Date ==>		<== Thread ==>

Subject:	Re: How to: IOC reading information from file?
From:	"Cobb, Tom \(DLSLtd,RAL,LSCI\) via Tech-talk" <tech-talk at aps.anl.gov>
To:	"Marco A. Barra Montevechi Filho" <marco.filho at lnls.br>, Michael Davidsaver <mdavidsaver at gmail.com>
Cc:	"Nariyoshi, Pedro" <nariyosh at frib.msu.edu>, "tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>
Date:	Tue, 29 Nov 2022 14:05:51 +0000

An alternative approach if going down the Python route is to write the whole IOC in Python using pythonSoftIOC. Something like this:

import json

# Import the basic framework components.
from softioc import asyncio_dispatcher,
builder,
softioc

# Set the record prefix
builder.SetDeviceName("MY-DEVICE-PREFIX")

# Make some dummy data
with open("/tmp/mydata.json",
"w")
as f:
    f.write('{"my_var":
1.0}')

# Create some records
value =
builder.aIn("VALUE",
initial_value=0.0)


def set_value_from_json(path:
str):
    with open(path)
as f:
        text =
f.read()
    value.set(json.loads(text)["my_var"])


path =
builder.stringOut("PATH",
always_update=True,
on_update=set_value_from_json)

# Boilerplate get the IOC started
builder.LoadDatabase()
softioc.iocInit(asyncio_dispatcher.AsyncioDispatcher())

# Finally leave the IOC running with an interactive shell.
softioc.interactive_ioc(globals())

# On commandline:
# $ caget MY-DEVICE-PREFIX:VALUE
# MY-DEVICE-PREFIX:VALUE 0.0
# $ caput MY-DEVICE-PREFIX:PATH /tmp/mydata.json
# $ caget MY-DEVICE-PREFIX:VALUE
# MY-DEVICE-PREFIX:VALUE 1.0

Thanks,

Tom

From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Michael Davidsaver via Tech-talk <tech-talk at aps.anl.gov>
Sent: 28 November 2022 20:55
To: Marco A. Barra Montevechi Filho <marco.filho at lnls.br>
Cc: Nariyoshi, Pedro <nariyosh at frib.msu.edu>; tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
Subject: Re: How to: IOC reading information from file?

On 11/28/22 12:37, Michael Davidsaver wrote:
> On 11/28/22 12:05, Marco A. Barra Montevechi Filho via Tech-talk wrote:
>> Thanks for the suggestion, Pedro!
>>
>> At the end of the day, i figured that maybe autosave fdbrestore function would do what i wanted. Unfortunately, the function was resulting in segmentation fault. Looking in tech-talk i found this thread: https://epics.anl.gov/tech-talk/2014/msg01851.php <https://epics.anl.gov/tech-talk/2014/msg01851.php> which suggested that for autosave versions before 5.4.1 it is a known bug which is fixed after that. Since im using autosave 5-10-2 and the PVs are not very long, i gave up using autosave for this.
>
> Could you provide any details which might go into a ticket?
> Specific arguments used? ideally a stack trace? etc...
>
> https://github.com/epics-modules/autosave/issues

I haven't tried fdbrestore() previously, so I'm not certain about the
caput() errors. It certainly didn't crash on me.

Did you do full cleanup and rebuild when switching between autosave versions?
(eg. "make distclean", or just deleting and re-downloading the source)

Linking in old object code files is great way to experience some bizarre crashes.

> epics> var save_restoreDebug 5
> epics> fdbrestore "ioc_settings.sav"
> save_restore:fdbrestore:entry
> save_restore:request_manual_restore: entry
> save_restore task: calling do_manual_restore('ioc_settings.sav')
> save_restore:do_manual_restore: entry for file 'ioc_settings.sav'
> epics> do_manual_restore:ca_put() to 'TST:Speed-SP.VAL'failed.
> do_manual_restore:ca_put() to 'TST:DM-Sel.VAL'failed.
> do_manual_restore:ca_put() to 'TST:SampT-Sel.VAL'failed.
> do_manual_restore:ca_put() to 'TST:SampT:N-Sel.VAL'failed.
> do_manual_restore:ca_put() to 'TST:SampDet-Sel.VAL'failed.
> do_manual_restore:ca_put() to 'TST:Plt-SP.VAL'failed.
> do_manual_restore:ca_put() to 'TST:Samp-SP.VAL'failed.
> do_manual_restore:ca_put() to 'TST:Plt:N-SP.VAL'failed.
> do_manual_restore:ca_put() to 'TST:Samp:N-SP.VAL'failed.
> do_manual_restore:ca_put() to 'TST:Gn:X-SP.VAL'failed.
> do_manual_restore:ca_put() to 'TST:Gn:Y-SP.VAL'failed.
> do_manual_restore:ca_put() to 'TST:Gn:Z-SP.VAL'failed.
> do_manual_restore:ca_put() to 'TST:Tl-Sel.VAL'failed.
> save_restore: manual restore status=1 (0==success)

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References:: How to: IOC reading information from file? Marco A. Barra Montevechi Filho via Tech-talk; Re: How to: IOC reading information from file? Nariyoshi, Pedro via Tech-talk; Re: How to: IOC reading information from file? Marco A. Barra Montevechi Filho via Tech-talk; Re: How to: IOC reading information from file? Michael Davidsaver via Tech-talk; Re: How to: IOC reading information from file? Michael Davidsaver via Tech-talk

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ANJ, 29 Nov 2022

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System