def store_and_cache_(instrument_id, key_id, value, timestamp=None, cache_only=False):
"""
Store and cache a DASMON parameter
@param instrument_id: Instrument object
@param key_id: key Parameter object
@param value: value for the given key
@param cache_only: only update cache
"""
# Do bother with parameter that are not monitored
if key_id.monitored is False:
return
# The longest allowable string is 128 characters
value_string = str(value)
if len(value_string) > 128:
value_string = value_string[:128]
datetime_timestamp = datetime.datetime.fromtimestamp(time.time()).replace(tzinfo=timezone.get_current_timezone())
if cache_only is False:
status_entry = StatusVariable(instrument_id=instrument_id,
key_id=key_id,
value=value_string)
# Force the timestamp value as needed
if timestamp is not None:
try:
datetime_timestamp = datetime.datetime.fromtimestamp(timestamp).replace(tzinfo=timezone.get_current_timezone())
status_entry.timestamp = datetime_timestamp
except:
logging.error("Could not process timestamp [%s]: %s", timestamp, sys.exc_value)
status_entry.save()
datetime_timestamp = status_entry.timestamp
# Update the latest value
try:
last_value = StatusCache.objects.filter(instrument_id=instrument_id,
key_id=key_id).latest('timestamp')
last_value.value = value_string
last_value.timestamp = datetime_timestamp
last_value.save()
except:
last_value = StatusCache(instrument_id=instrument_id,
key_id=key_id,
value=value_string,
timestamp=datetime_timestamp)
last_value.save()
