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"""Support files for podman API implementation."""
import datetime
import threading
from dateutil.parser import parse as dateutil_parse
__all__ = [
'cached_property',
'datetime_parse',
'datetime_format',
]
class cached_property(object):
"""cached_property() - computed once per instance, cached as attribute.
Maybe this will make a future version of python.
"""
def __init__(self, func):
"""Construct context manager."""
self.func = func
self.__doc__ = func.__doc__
self.lock = threading.RLock()
def __get__(self, instance, cls=None):
"""Retrieve previous value, or call func()."""
if instance is None:
return self
attrname = self.func.__name__
try:
cache = instance.__dict__
except AttributeError: # objects with __slots__ have no __dict__
msg = ("No '__dict__' attribute on {}"
" instance to cache {} property.").format(
repr(type(instance).__name__), repr(attrname))
raise TypeError(msg) from None
with self.lock:
# check if another thread filled cache while we awaited lock
if attrname not in cache:
cache[attrname] = self.func(instance)
return cache[attrname]
def datetime_parse(string):
"""Convert timestamps to datetime.
tzinfo aware, if provided.
"""
return dateutil_parse(string.upper(), fuzzy=True)
def datetime_format(dt):
"""Format datetime in consistent style."""
if isinstance(dt, str):
return datetime_parse(dt).isoformat()
elif isinstance(dt, datetime.datetime):
return dt.isoformat()
else:
raise ValueError('Unable to format {}. Type {} not supported.'.format(
dt, type(dt)))
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