Experimental Physics and
Industrial Control System

Hi Windsor,

 

Some examples of python code for handling the pb files can be found at:

 

https://github.com/zhangt58/PyArchAppl/blob/master/main/data/pb/decode.py

https://github.com/dls-controls/aapy/blob/master/aa/pb.py

and

https://gitlab.esss.lu.se/ics-software/py-epicsarchiver/-/blob/master/epicsarchiver/pb.py?ref_type=heads

 

Obviously, I prefer my own code 😊

 

In terms of appending data, could you explain your use case? I don’t know why you would want to append data from outside the archiver.

The archiver makes many assumptions about these files in terms of what data is in them dependent on the name of the file. I would be

Careful about altering them.

 

A simple solution can be to push data into the files using a PV! Note that the archiver doesn’t do any checks that timestamps correspond to the current time.

Only that they are sequential. So as long as you are adding new events you can push extra events in.

 

A second solution is to use the merge data from another cluster in the ETL process. You can see some documentation at https://slacmshankar.github.io/epicsarchiver_docs/redundancy.html

I can probably create an example if you need it.

 

You could then set up a dummy PV to push the data you want in, and allow the archiver ETL process to merge the data for you.

 

I hope that helps.

Sky