'Create flow throttler object.
Args:
daily_req_limit: Number of flows allow per user per client. Integer.
dup_interval: rdfvalue.Duration time during which duplicate flows will be
blocked.'

def __init__(self, daily_req_limit=None, dup_interval=None):

    self.daily_req_limit = daily_req_limit
    self.dup_interval = dup_interval
