コード例 #1
0
def store_and_cache(instrument_id, key, value):
    """
        Store and cache a DASMON parameter
        @param instrument_id: Instrument object
        @param key: key string
        @param value: value for the given key
    """
    try:
        key_id = Parameter.objects.get(name=key)
    except:
        key_id = Parameter(name=key)
        key_id.save()
    status_entry = StatusVariable(instrument_id=instrument_id,
                                  key_id=key_id,
                                  value=value)
    status_entry.save()
    
    # Update the latest value
    try:
        last_value = StatusCache.objects.filter(instrument_id=instrument_id,
                                             key_id=key_id).latest('timestamp')
        last_value.value = value = status_entry.value
        last_value.timestamp = status_entry.timestamp
        last_value.save()
    except:
        last_value = StatusCache(instrument_id=instrument_id,
                                 key_id=key_id,
                                 value=status_entry.value,
                                 timestamp=status_entry.timestamp)
        last_value.save()
コード例 #2
0
def add_status_entry(instrument_id, message_channel, value):
    """
        Add a status message for a given instrument.
        
        @param instrument_id: Instrument object
        @param message_channel: name of the AMQ channel used to report updates
        @param value: value for the entry (string)
    """
    # Find the parameter used to report updates
    try:
        key_id = Parameter.objects.get(name=message_channel)
        update = StatusVariable(instrument_id=instrument_id,
                                key_id=key_id,
                                value=str(value))
        update.save()
    except:
        logging.error("add_status_entry: could add parameter for %s" % message_channel)
コード例 #3
0
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()