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# Copyright 2018 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
#
# https://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.
from datetime import datetime
from datetime import timedelta
from datetime import timezone
from google.protobuf import duration_pb2
from google.protobuf import timestamp_pb2
from proto import datetime_helpers, utils
class TimestampRule:
"""A marshal between Python datetimes and protobuf timestamps.
Note: Python datetimes are less precise than protobuf datetimes
(microsecond vs. nanosecond level precision). If nanosecond-level
precision matters, it is recommended to interact with the internal
proto directly.
"""
def to_python(
self, value, *, absent: bool = None
) -> datetime_helpers.DatetimeWithNanoseconds:
if isinstance(value, timestamp_pb2.Timestamp):
if absent:
return None
return datetime_helpers.DatetimeWithNanoseconds.from_timestamp_pb(value)
return value
def to_proto(self, value) -> timestamp_pb2.Timestamp:
if isinstance(value, datetime_helpers.DatetimeWithNanoseconds):
return value.timestamp_pb()
if isinstance(value, datetime):
return timestamp_pb2.Timestamp(
seconds=int(value.timestamp()),
nanos=value.microsecond * 1000,
)
if isinstance(value, str):
timestamp_value = timestamp_pb2.Timestamp()
timestamp_value.FromJsonString(value=value)
return timestamp_value
return value
class DurationRule:
"""A marshal between Python timedeltas and protobuf durations.
Note: Python timedeltas are less precise than protobuf durations
(microsecond vs. nanosecond level precision). If nanosecond-level
precision matters, it is recommended to interact with the internal
proto directly.
"""
def to_python(self, value, *, absent: bool = None) -> timedelta:
if isinstance(value, duration_pb2.Duration):
return timedelta(
days=value.seconds // 86400,
seconds=value.seconds % 86400,
microseconds=value.nanos // 1000,
)
return value
def to_proto(self, value) -> duration_pb2.Duration:
if isinstance(value, timedelta):
return duration_pb2.Duration(
seconds=value.days * 86400 + value.seconds,
nanos=value.microseconds * 1000,
)
if isinstance(value, str):
duration_value = duration_pb2.Duration()
duration_value.FromJsonString(value=value)
return duration_value
return value