/usr/lib/python3/dist-packages/protorpc/message_types.py is in python3-protorpc-standalone 0.9.1-3.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 | #!/usr/bin/env python
#
# Copyright 2010 Google Inc.
#
# 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.
#
"""Simple protocol message types.
Includes new message and field types that are outside what is defined by the
protocol buffers standard.
"""
__author__ = 'rafek@google.com (Rafe Kaplan)'
import datetime
from . import messages
from . import util
__all__ = [
'DateTimeField',
'DateTimeMessage',
'VoidMessage',
]
class VoidMessage(messages.Message):
"""Empty message."""
class DateTimeMessage(messages.Message):
"""Message to store/transmit a DateTime.
Fields:
milliseconds: Milliseconds since Jan 1st 1970 local time.
time_zone_offset: Optional time zone offset, in minutes from UTC.
"""
milliseconds = messages.IntegerField(1, required=True)
time_zone_offset = messages.IntegerField(2)
class DateTimeField(messages.MessageField):
"""Field definition for datetime values.
Stores a python datetime object as a field. If time zone information is
included in the datetime object, it will be included in
the encoded data when this is encoded/decoded.
"""
type = datetime.datetime
message_type = DateTimeMessage
@util.positional(3)
def __init__(self,
number,
**kwargs):
super(DateTimeField, self).__init__(self.message_type,
number,
**kwargs)
def value_from_message(self, message):
"""Convert DateTimeMessage to a datetime.
Args:
A DateTimeMessage instance.
Returns:
A datetime instance.
"""
message = super(DateTimeField, self).value_from_message(message)
if message.time_zone_offset is None:
return datetime.datetime.utcfromtimestamp(message.milliseconds / 1000.0)
# Need to subtract the time zone offset, because when we call
# datetime.fromtimestamp, it will add the time zone offset to the
# value we pass.
milliseconds = (message.milliseconds -
60000 * message.time_zone_offset)
timezone = util.TimeZoneOffset(message.time_zone_offset)
return datetime.datetime.fromtimestamp(milliseconds / 1000.0,
tz=timezone)
def value_to_message(self, value):
value = super(DateTimeField, self).value_to_message(value)
# First, determine the delta from the epoch, so we can fill in
# DateTimeMessage's milliseconds field.
if value.tzinfo is None:
time_zone_offset = 0
local_epoch = datetime.datetime.utcfromtimestamp(0)
else:
time_zone_offset = value.tzinfo.utcoffset(value).total_seconds()
# Determine Jan 1, 1970 local time.
local_epoch = datetime.datetime.fromtimestamp(-time_zone_offset,
tz=value.tzinfo)
delta = value - local_epoch
# Create and fill in the DateTimeMessage, including time zone if
# one was specified.
message = DateTimeMessage()
message.milliseconds = int(delta.total_seconds() * 1000)
if value.tzinfo is not None:
utc_offset = value.tzinfo.utcoffset(value)
if utc_offset is not None:
message.time_zone_offset = int(
value.tzinfo.utcoffset(value).total_seconds() / 60)
return message
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