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"""Support files for podman API implementation."""
import datetime
import functools
from dateutil.parser import parse as dateutil_parse
__all__ = [
'cached_property',
'datetime_parse',
'datetime_format',
]
def cached_property(fn):
"""Cache return to save future expense."""
return property(functools.lru_cache(maxsize=8)(fn))
# Cannot subclass collections.UserDict, breaks varlink
class Config(dict):
"""Silently ignore None values, only take key once."""
def __init__(self, **kwargs):
"""Construct dictionary."""
super(Config, self).__init__(kwargs)
def __setitem__(self, key, value):
"""Store unique, not None values."""
if value is None:
return
if super().__contains__(key):
return
super().__setitem__(key, value)
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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