Warnings are displayed for blocks with empty tables

[dmgav]

A series of warnings is displayed by the IOC each time a user switches between designs using GUI. The warnings are printed for the blocks with empty tables (in this test SEQ2 and PGEN2):

Traceback (most recent call last):
  File "/nsls2/users/dgavrilov/repos/PandABlocks-ioc/src/pandablocks_ioc/_tables.py", line 678, in _update_scalar
    scalar_val = waveform_data[index]
IndexError: index 0 is out of bounds for axis 0 with size 0
WARNING:Index 0 of record SEQ2:TABLE:TRIGGER is out of bounds.
Traceback (most recent call last):
  File "/nsls2/users/dgavrilov/repos/PandABlocks-ioc/src/pandablocks_ioc/_tables.py", line 678, in _update_scalar
    scalar_val = waveform_data[index]
IndexError: index 0 is out of bounds for axis 0 with size 0
WARNING:Index 0 of record SEQ2:TABLE:POSITION is out of bounds.
Traceback (most recent call last):
  File "/nsls2/users/dgavrilov/repos/PandABlocks-ioc/src/pandablocks_ioc/_tables.py", line 678, in _update_scalar
    scalar_val = waveform_data[index]
IndexError: index 0 is out of bounds for axis 0 with size 0
WARNING:Index 0 of record SEQ2:TABLE:TIME1 is out of bounds.
Traceback (most recent call last):
  File "/nsls2/users/dgavrilov/repos/PandABlocks-ioc/src/pandablocks_ioc/_tables.py", line 678, in _update_scalar
    scalar_val = waveform_data[index]
IndexError: index 0 is out of bounds for axis 0 with size 0
WARNING:Index 0 of record SEQ2:TABLE:OUTA1 is out of bounds.
Traceback (most recent call last):
  File "/nsls2/users/dgavrilov/repos/PandABlocks-ioc/src/pandablocks_ioc/_tables.py", line 678, in _update_scalar
    scalar_val = waveform_data[index]
IndexError: index 0 is out of bounds for axis 0 with size 0
WARNING:Index 0 of record SEQ2:TABLE:OUTB1 is out of bounds.
Traceback (most recent call last):
  File "/nsls2/users/dgavrilov/repos/PandABlocks-ioc/src/pandablocks_ioc/_tables.py", line 678, in _update_scalar
    scalar_val = waveform_data[index]
IndexError: index 0 is out of bounds for axis 0 with size 0
WARNING:Index 0 of record SEQ2:TABLE:OUTC1 is out of bounds.
Traceback (most recent call last):
  File "/nsls2/users/dgavrilov/repos/PandABlocks-ioc/src/pandablocks_ioc/_tables.py", line 678, in _update_scalar
    scalar_val = waveform_data[index]
IndexError: index 0 is out of bounds for axis 0 with size 0
WARNING:Index 0 of record SEQ2:TABLE:OUTD1 is out of bounds.
Traceback (most recent call last):
  File "/nsls2/users/dgavrilov/repos/PandABlocks-ioc/src/pandablocks_ioc/_tables.py", line 678, in _update_scalar
    scalar_val = waveform_data[index]
IndexError: index 0 is out of bounds for axis 0 with size 0
WARNING:Index 0 of record SEQ2:TABLE:OUTE1 is out of bounds.
Traceback (most recent call last):
  File "/nsls2/users/dgavrilov/repos/PandABlocks-ioc/src/pandablocks_ioc/_tables.py", line 678, in _update_scalar
    scalar_val = waveform_data[index]
IndexError: index 0 is out of bounds for axis 0 with size 0
WARNING:Index 0 of record SEQ2:TABLE:OUTF1 is out of bounds.
Traceback (most recent call last):
  File "/nsls2/users/dgavrilov/repos/PandABlocks-ioc/src/pandablocks_ioc/_tables.py", line 678, in _update_scalar
    scalar_val = waveform_data[index]
IndexError: index 0 is out of bounds for axis 0 with size 0
WARNING:Index 0 of record SEQ2:TABLE:TIME2 is out of bounds.
Traceback (most recent call last):
  File "/nsls2/users/dgavrilov/repos/PandABlocks-ioc/src/pandablocks_ioc/_tables.py", line 678, in _update_scalar
    scalar_val = waveform_data[index]
IndexError: index 0 is out of bounds for axis 0 with size 0
WARNING:Index 0 of record SEQ2:TABLE:OUTA2 is out of bounds.
Traceback (most recent call last):
  File "/nsls2/users/dgavrilov/repos/PandABlocks-ioc/src/pandablocks_ioc/_tables.py", line 678, in _update_scalar
    scalar_val = waveform_data[index]
IndexError: index 0 is out of bounds for axis 0 with size 0
WARNING:Index 0 of record SEQ2:TABLE:OUTB2 is out of bounds.
Traceback (most recent call last):
  File "/nsls2/users/dgavrilov/repos/PandABlocks-ioc/src/pandablocks_ioc/_tables.py", line 678, in _update_scalar
    scalar_val = waveform_data[index]
IndexError: index 0 is out of bounds for axis 0 with size 0
WARNING:Index 0 of record SEQ2:TABLE:OUTC2 is out of bounds.
Traceback (most recent call last):
  File "/nsls2/users/dgavrilov/repos/PandABlocks-ioc/src/pandablocks_ioc/_tables.py", line 678, in _update_scalar
    scalar_val = waveform_data[index]
IndexError: index 0 is out of bounds for axis 0 with size 0
WARNING:Index 0 of record SEQ2:TABLE:OUTD2 is out of bounds.
Traceback (most recent call last):
  File "/nsls2/users/dgavrilov/repos/PandABlocks-ioc/src/pandablocks_ioc/_tables.py", line 678, in _update_scalar
    scalar_val = waveform_data[index]
IndexError: index 0 is out of bounds for axis 0 with size 0
WARNING:Index 0 of record SEQ2:TABLE:OUTE2 is out of bounds.
Traceback (most recent call last):
  File "/nsls2/users/dgavrilov/repos/PandABlocks-ioc/src/pandablocks_ioc/_tables.py", line 678, in _update_scalar
    scalar_val = waveform_data[index]
IndexError: index 0 is out of bounds for axis 0 with size 0
WARNING:Index 0 of record SEQ2:TABLE:OUTF2 is out of bounds.
Traceback (most recent call last):
  File "/nsls2/users/dgavrilov/repos/PandABlocks-ioc/src/pandablocks_ioc/_tables.py", line 678, in _update_scalar
    scalar_val = waveform_data[index]
IndexError: index 0 is out of bounds for axis 0 with size 0
WARNING:Index 0 of record PGEN2:TABLE:POSITION is out of bounds.
Traceback (most recent call last):
  File "/nsls2/users/dgavrilov/repos/PandABlocks-ioc/src/pandablocks_ioc/_tables.py", line 678, in _update_scalar
    scalar_val = waveform_data[index]
IndexError: index 0 is out of bounds for axis 0 with size 0

[dmgav]

Possible solution: to quiet down the exception the case when len(waveform) == 0 should be processed separately by raising a dedicated exception or just by checking the condition and setting scalar_val=0 and sev to alarm.NO_ALARM or alarm.INVALID_ALARM without printing the error message.

PandABlocks-ioc/src/pandablocks_ioc/_tables.py

Lines 675 to 695 in 35360f4

	try:
	scalar_val = waveform_data[index]
	if labels:
	# mbbi/o records must use the numeric index
	scalar_val = labels.index(scalar_val)
	sev = alarm.NO_ALARM
	except IndexError as e:
	logging.warning(
	f"Index {index} of record {waveform_record_name} is out of bounds.",
	exc_info=e,
	)
	scalar_val = 0
	sev = alarm.INVALID_ALARM
	except ValueError as e:
	logging.warning(
	f"Value {scalar_val} of record {waveform_record_name} is not "
	"a recognised value.",
	exc_info=e,
	)
	scalar_val = 0
	sev = alarm.INVALID_ALARM