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# $Id$
# Copyright (C) 2007--2008 American Registry for Internet Numbers ("ARIN")
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND ARIN DISCLAIMS ALL WARRANTIES WITH
# REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
# AND FITNESS. IN NO EVENT SHALL ARIN BE LIABLE FOR ANY SPECIAL, DIRECT,
# INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
# LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
# OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
# PERFORMANCE OF THIS SOFTWARE.
"""Unified RPKI date/time handling, based on the standard Python datetime module.
Module name chosen to sidestep a nightmare of import-related errors
that occur with the more obvious module names.
"""
import datetime as pydatetime
def now():
"""Get current timestamp."""
return datetime.utcnow()
class datetime(pydatetime.datetime):
"""RPKI extensions to standard datetime.datetime class. All work
here is in UTC, so we use naive datetime objects.
"""
def totimestamp(self):
"""Convert to seconds from epoch (like time.time()). Conversion
method is a bit silly, but avoids time module timezone whackiness.
"""
return int(self.strftime("%s"))
@classmethod
def fromUTCTime(cls, x):
"""Convert from ASN.1 UTCTime."""
return cls.strptime(x, "%y%m%d%H%M%SZ")
def toUTCTime(self):
"""Convert to ASN.1 UTCTime."""
return self.strftime("%y%m%d%H%M%SZ")
@classmethod
def fromGeneralizedTime(cls, x):
"""Convert from ASN.1 GeneralizedTime."""
return cls.strptime(x, "%Y%m%d%H%M%SZ")
def toGeneralizedTime(self):
"""Convert to ASN.1 GeneralizedTime."""
return self.strftime("%Y%m%d%H%M%SZ")
@classmethod
def fromASN1tuple(cls, x):
"""Convert from ASN.1 tuple representation."""
assert isinstance(x, tuple) and len(x) == 2 and x[0] in ("utcTime", "generalTime")
if x[0] == "utcTime":
return cls.fromUTCTime(x[1])
else:
return cls.fromGeneralizedTime(x[1])
## @var PKIX_threshhold
# Threshold specified in RFC 3280 for switchover from UTCTime to GeneralizedTime.
PKIX_threshhold = pydatetime.datetime(2050, 1, 1)
def toASN1tuple(self):
"""Convert to ASN.1 tuple representation."""
if self < self.PKIX_threshhold:
return "utcTime", self.toUTCTime()
else:
return "generalTime", self.toGeneralizedTime()
@classmethod
def fromXMLtime(cls, x):
"""Convert from XML time representation."""
if x is None:
return None
else:
return cls.strptime(x, "%Y-%m-%dT%H:%M:%SZ")
def toXMLtime(self):
"""Convert to XML time representation."""
return self.strftime("%Y-%m-%dT%H:%M:%SZ")
def __str__(self):
return self.toXMLtime()
@classmethod
def fromdatetime(cls, x):
"""Convert a datetime.datetime object into this subclass.
This is whacky due to the weird constructors for datetime.
"""
return cls.combine(x.date(), x.time())
def __add__(self, other):
"""Force correct class for timedelta results."""
return self.fromdatetime(pydatetime.datetime.__add__(self, other))
def __sub__(self, other):
"""Force correct class for timedelta results."""
return self.fromdatetime(pydatetime.datetime.__sub__(self, other))
@classmethod
def from_sql(cls, x):
"""Convert from SQL storage format."""
return cls.fromdatetime(x)
def to_sql(self):
"""Convert to SQL storage format.
There's something whacky going on in the MySQLdb module, it throws
range errors when storing a derived type into a DATETIME column.
Investigate some day, but for now brute force this by copying the
relevant fields into a datetime.datetime for MySQLdb's
consumption.
"""
return pydatetime.datetime(year = self.year, month = self.month, day = self.day,
hour = self.hour, minute = self.minute, second = self.second,
microsecond = 0, tzinfo = None)
def later(self, other):
"""Return the later of two timestamps."""
return other if other > self else self
def earlier(self, other):
"""Return the earlier of two timestamps."""
return other if other < self else self
# Alias to simplify imports for callers
timedelta = pydatetime.timedelta
if __name__ == "__main__":
now = datetime.now()
print now
print repr(now)
print now.strftime("%s")
print now.toUTCTime()
print now.toGeneralizedTime()
print now.toASN1tuple()
print now.toXMLtime()
print
then = now
then += timedelta(days = 30)
print then
print repr(then)
print then.strftime("%s")
print then.toUTCTime()
print then.toGeneralizedTime()
print then.toASN1tuple()
print then.toXMLtime()
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