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-"""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.
-
-$Id$
-
-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.
-"""
-
-import datetime as pydatetime
-import re
-
-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
-
-class timedelta(pydatetime.timedelta):
- """Timedelta with text parsing. This accepts two input formats:
-
- - A simple integer, indicating a number of seconds.
-
- - A string of the form "wD xH yM zS" where w, x, y, and z are integers
- and D, H, M, and S indicate days, hours, minutes, and seconds.
- All of the fields are optional, but at least one must be specified.
- Eg, "3D4H" means "three days plus four hours".
- """
-
- ## @var regexp
- # Hideously ugly regular expression to parse the complex text form.
- # Tags are intended for use with re.MatchObject.groupdict() and map
- # directly to the keywords expected by the timedelta constructor.
-
- regexp = re.compile("\\s*".join(("^",
- "(?:(?P<days>\\d+)D)?",
- "(?:(?P<hours>\\d+)H)?",
- "(?:(?P<minutes>\\d+)M)?",
- "(?:(?P<seconds>\\d+)S)?",
- "$")),
- re.I)
-
- @classmethod
- def parse(cls, arg):
- """Parse text into a timedelta object."""
- if not isinstance(arg, str):
- return cls(seconds = arg)
- elif arg.isdigit():
- return cls(seconds = int(arg))
- else:
- match = cls.regexp.match(arg)
- if match:
- return cls(**dict((k, int(v)) for (k, v) in match.groupdict().items() if v is not None))
- else:
- raise RuntimeError, "Couldn't parse timedelta %s" % repr(arg)
-
-
- def convert_to_seconds(self):
- """Convert a timedelta interval to seconds."""
- return self.days * 24 * 60 * 60 + self.seconds
-
-if __name__ == "__main__":
-
- def test(t):
- print
- print "str: ", t
- print "repr: ", repr(t)
- print "seconds since epoch:", t.strftime("%s")
- print "UTCTime: ", t.toUTCTime()
- print "GeneralizedTime: ", t.toGeneralizedTime()
- print "ASN1tuple: ", t.toASN1tuple()
- print "XMLtime: ", t.toXMLtime()
- print
-
- print
- print "Testing time conversion routines"
- test(now())
- test(now() + timedelta(days = 30))
- test(now() + timedelta.parse("3d5s"))
- timedelta.parse(" 3d 5s ")