caproto.server.scan_wrapper

caproto.server.scan_wrapper(scan_function, period, *, subtract_elapsed=True, stop_on_error=False, failure_severity=<AlarmSeverity.MAJOR_ALARM: 2>, use_scan_field=False)

Wrap a function intended for pvproperty.scan with common logic to periodically call it.

Parameters

scan_functionasync callable

The scan function to wrap, with expected signature:

(group, instance, async_library)

periodfloat

Wait period seconds between calls to the scanned function

subtract_elapsedbool, optional

Subtract the elapsed time of the previous call from the period for the subsequent iteration

stop_on_errorbool, optional

Fail (and stop scanning) when unhandled exceptions occur

use_scan_fieldbool, optional

Use the .SCAN field if this pvproperty is a mocked record. Raises ValueError if record is not used.

Returns

wrappedcallable

The wrapped scan function.