def nearest(self, n=1, timestamp=None):
"""nearest bin. timestamp must be a utc datetime, defaults to now"""
if timestamp is None:
timestamp = utcdtnow()
n_before = self._ts_query(end_time=timestamp).order_by(desc(Bin.sample_time)).limit(n).all()
min_date = datetime2utcdatetime(n_before[-1].sample_time)
max_date = timestamp + (timestamp - min_date)
n_after = self._ts_query(start_time=timestamp, end_time=max_date).order_by(Bin.sample_time).limit(n).all()
cand = list(n_before) + list(n_after)
return sorted(cand, key=lambda b: timestamp - datetime2utcdatetime(b.sample_time))[:n]
def __init__(self,pid,pathname,length=None,checksum=None,fix_time=None,create_time=None,mod_time=None,checksum_type='md5',fix=True):
"""all timestamps should be datetimes with timezone"""
self.pid = pid
self.pathname = pathname
self.filename = os.path.basename(pathname)
self.length = length
self.checksum = checksum
self.checksum_type = checksum_type
self.fix_time = datetime2utcdatetime(fix_time)
self.create_time = datetime2utcdatetime(create_time)
self.mod_time = datetime2utcdatetime(mod_time)
if fix:
self.fix()