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# Copyright 2017 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Helpers for :mod:`datetime`."""
import calendar
import datetime
import re
from google.protobuf import timestamp_pb2
_UTC_EPOCH = datetime.datetime.fromtimestamp(0, datetime.timezone.utc)
_RFC3339_MICROS = "%Y-%m-%dT%H:%M:%S.%fZ"
_RFC3339_NO_FRACTION = "%Y-%m-%dT%H:%M:%S"
# datetime.strptime cannot handle nanosecond precision: parse w/ regex
_RFC3339_NANOS = re.compile(
r"""
(?P<no_fraction>
\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2} # YYYY-MM-DDTHH:MM:SS
)
( # Optional decimal part
\. # decimal point
(?P<nanos>\d{1,9}) # nanoseconds, maybe truncated
)?
Z # Zulu
""",
re.VERBOSE,
)
def _from_microseconds(value):
"""Convert timestamp in microseconds since the unix epoch to datetime.
Args:
value (float): The timestamp to convert, in microseconds.
Returns:
datetime.datetime: The datetime object equivalent to the timestamp in
UTC.
"""
return _UTC_EPOCH + datetime.timedelta(microseconds=value)
def _to_rfc3339(value, ignore_zone=True):
"""Convert a datetime to an RFC3339 timestamp string.
Args:
value (datetime.datetime):
The datetime object to be converted to a string.
ignore_zone (bool): If True, then the timezone (if any) of the
datetime object is ignored and the datetime is treated as UTC.
Returns:
str: The RFC3339 formatted string representing the datetime.
"""
if not ignore_zone and value.tzinfo is not None:
# Convert to UTC and remove the time zone info.
value = value.replace(tzinfo=None) - value.utcoffset()
return value.strftime(_RFC3339_MICROS)
class DatetimeWithNanoseconds(datetime.datetime):
"""Track nanosecond in addition to normal datetime attrs.
Nanosecond can be passed only as a keyword argument.
"""
__slots__ = ("_nanosecond",)
# pylint: disable=arguments-differ
def __new__(cls, *args, **kw):
nanos = kw.pop("nanosecond", 0)
if nanos > 0:
if "microsecond" in kw:
raise TypeError("Specify only one of 'microsecond' or 'nanosecond'")
kw["microsecond"] = nanos // 1000
inst = datetime.datetime.__new__(cls, *args, **kw)
inst._nanosecond = nanos or 0
return inst
# pylint: disable=arguments-differ
def replace(self, *args, **kw):
"""Return a date with the same value, except for those parameters given
new values by whichever keyword arguments are specified. For example,
if d == date(2002, 12, 31), then
d.replace(day=26) == date(2002, 12, 26).
NOTE: nanosecond and microsecond are mutually exclusive arguments.
"""
ms_provided = "microsecond" in kw
ns_provided = "nanosecond" in kw
provided_ns = kw.pop("nanosecond", 0)
prev_nanos = self.nanosecond
if ms_provided and ns_provided:
raise TypeError("Specify only one of 'microsecond' or 'nanosecond'")
if ns_provided:
# if nanos were provided, manipulate microsecond kw arg to super
kw["microsecond"] = provided_ns // 1000
inst = super().replace(*args, **kw)
if ms_provided:
# ms were provided, nanos are invalid, build from ms
inst._nanosecond = inst.microsecond * 1000
elif ns_provided:
# ns were provided, replace nanoseconds to match after calling super
inst._nanosecond = provided_ns
else:
# if neither ms or ns were provided, passthru previous nanos.
inst._nanosecond = prev_nanos
return inst
@property
def nanosecond(self):
"""Read-only: nanosecond precision."""
return self._nanosecond or self.microsecond * 1000
def rfc3339(self):
"""Return an RFC3339-compliant timestamp.
Returns:
(str): Timestamp string according to RFC3339 spec.
"""
if self._nanosecond == 0:
return _to_rfc3339(self)
nanos = str(self._nanosecond).rjust(9, "0").rstrip("0")
return "{}.{}Z".format(self.strftime(_RFC3339_NO_FRACTION), nanos)
@classmethod
def from_rfc3339(cls, stamp):
"""Parse RFC3339-compliant timestamp, preserving nanoseconds.
Args:
stamp (str): RFC3339 stamp, with up to nanosecond precision
Returns:
:class:`DatetimeWithNanoseconds`:
an instance matching the timestamp string
Raises:
ValueError: if `stamp` does not match the expected format
"""
with_nanos = _RFC3339_NANOS.match(stamp)
if with_nanos is None:
raise ValueError(
"Timestamp: {}, does not match pattern: {}".format(
stamp, _RFC3339_NANOS.pattern
)
)
bare = datetime.datetime.strptime(
with_nanos.group("no_fraction"), _RFC3339_NO_FRACTION
)
fraction = with_nanos.group("nanos")
if fraction is None:
nanos = 0
else:
scale = 9 - len(fraction)
nanos = int(fraction) * (10**scale)
return cls(
bare.year,
bare.month,
bare.day,
bare.hour,
bare.minute,
bare.second,
nanosecond=nanos,
tzinfo=datetime.timezone.utc,
)
def timestamp_pb(self):
"""Return a timestamp message.
Returns:
(:class:`~google.protobuf.timestamp_pb2.Timestamp`): Timestamp message
"""
inst = (
self
if self.tzinfo is not None
else self.replace(tzinfo=datetime.timezone.utc)
)
delta = inst - _UTC_EPOCH
seconds = int(delta.total_seconds())
nanos = self._nanosecond or self.microsecond * 1000
return timestamp_pb2.Timestamp(seconds=seconds, nanos=nanos)
@classmethod
def from_timestamp_pb(cls, stamp):
"""Parse RFC3339-compliant timestamp, preserving nanoseconds.
Args:
stamp (:class:`~google.protobuf.timestamp_pb2.Timestamp`): timestamp message
Returns:
:class:`DatetimeWithNanoseconds`:
an instance matching the timestamp message
"""
microseconds = int(stamp.seconds * 1e6)
bare = _from_microseconds(microseconds)
return cls(
bare.year,
bare.month,
bare.day,
bare.hour,
bare.minute,
bare.second,
nanosecond=stamp.nanos,
tzinfo=datetime.timezone.utc,
)
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