583 lines
20 KiB
Python
583 lines
20 KiB
Python
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# Protocol Buffers - Google's data interchange format
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# Copyright 2008 Google Inc. All rights reserved.
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# https://developers.google.com/protocol-buffers/
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following disclaimer
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# in the documentation and/or other materials provided with the
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# distribution.
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# * Neither the name of Google Inc. nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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"""Contains well known classes.
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This files defines well known classes which need extra maintenance including:
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- Any
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- Duration
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- FieldMask
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- Struct
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- Timestamp
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"""
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__author__ = 'jieluo@google.com (Jie Luo)'
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import calendar
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import collections.abc
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import datetime
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from google.protobuf.internal import field_mask
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FieldMask = field_mask.FieldMask
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_TIMESTAMPFOMAT = '%Y-%m-%dT%H:%M:%S'
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_NANOS_PER_SECOND = 1000000000
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_NANOS_PER_MILLISECOND = 1000000
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_NANOS_PER_MICROSECOND = 1000
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_MILLIS_PER_SECOND = 1000
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_MICROS_PER_SECOND = 1000000
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_SECONDS_PER_DAY = 24 * 3600
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_DURATION_SECONDS_MAX = 315576000000
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class Any(object):
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"""Class for Any Message type."""
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__slots__ = ()
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def Pack(self, msg, type_url_prefix='type.googleapis.com/',
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deterministic=None):
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"""Packs the specified message into current Any message."""
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if len(type_url_prefix) < 1 or type_url_prefix[-1] != '/':
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self.type_url = '%s/%s' % (type_url_prefix, msg.DESCRIPTOR.full_name)
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else:
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self.type_url = '%s%s' % (type_url_prefix, msg.DESCRIPTOR.full_name)
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self.value = msg.SerializeToString(deterministic=deterministic)
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def Unpack(self, msg):
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"""Unpacks the current Any message into specified message."""
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descriptor = msg.DESCRIPTOR
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if not self.Is(descriptor):
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return False
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msg.ParseFromString(self.value)
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return True
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def TypeName(self):
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"""Returns the protobuf type name of the inner message."""
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# Only last part is to be used: b/25630112
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return self.type_url.split('/')[-1]
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def Is(self, descriptor):
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"""Checks if this Any represents the given protobuf type."""
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return '/' in self.type_url and self.TypeName() == descriptor.full_name
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_EPOCH_DATETIME_NAIVE = datetime.datetime.utcfromtimestamp(0)
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_EPOCH_DATETIME_AWARE = datetime.datetime.fromtimestamp(
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0, tz=datetime.timezone.utc)
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class Timestamp(object):
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"""Class for Timestamp message type."""
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__slots__ = ()
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def ToJsonString(self):
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"""Converts Timestamp to RFC 3339 date string format.
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Returns:
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A string converted from timestamp. The string is always Z-normalized
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and uses 3, 6 or 9 fractional digits as required to represent the
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exact time. Example of the return format: '1972-01-01T10:00:20.021Z'
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"""
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nanos = self.nanos % _NANOS_PER_SECOND
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total_sec = self.seconds + (self.nanos - nanos) // _NANOS_PER_SECOND
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seconds = total_sec % _SECONDS_PER_DAY
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days = (total_sec - seconds) // _SECONDS_PER_DAY
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dt = datetime.datetime(1970, 1, 1) + datetime.timedelta(days, seconds)
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result = dt.isoformat()
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if (nanos % 1e9) == 0:
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# If there are 0 fractional digits, the fractional
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# point '.' should be omitted when serializing.
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return result + 'Z'
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if (nanos % 1e6) == 0:
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# Serialize 3 fractional digits.
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return result + '.%03dZ' % (nanos / 1e6)
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if (nanos % 1e3) == 0:
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# Serialize 6 fractional digits.
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return result + '.%06dZ' % (nanos / 1e3)
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# Serialize 9 fractional digits.
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return result + '.%09dZ' % nanos
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def FromJsonString(self, value):
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"""Parse a RFC 3339 date string format to Timestamp.
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Args:
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value: A date string. Any fractional digits (or none) and any offset are
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accepted as long as they fit into nano-seconds precision.
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Example of accepted format: '1972-01-01T10:00:20.021-05:00'
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Raises:
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ValueError: On parsing problems.
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"""
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if not isinstance(value, str):
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raise ValueError('Timestamp JSON value not a string: {!r}'.format(value))
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timezone_offset = value.find('Z')
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if timezone_offset == -1:
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timezone_offset = value.find('+')
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if timezone_offset == -1:
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timezone_offset = value.rfind('-')
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if timezone_offset == -1:
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raise ValueError(
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'Failed to parse timestamp: missing valid timezone offset.')
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time_value = value[0:timezone_offset]
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# Parse datetime and nanos.
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point_position = time_value.find('.')
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if point_position == -1:
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second_value = time_value
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nano_value = ''
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else:
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second_value = time_value[:point_position]
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nano_value = time_value[point_position + 1:]
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if 't' in second_value:
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raise ValueError(
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'time data \'{0}\' does not match format \'%Y-%m-%dT%H:%M:%S\', '
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'lowercase \'t\' is not accepted'.format(second_value))
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date_object = datetime.datetime.strptime(second_value, _TIMESTAMPFOMAT)
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td = date_object - datetime.datetime(1970, 1, 1)
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seconds = td.seconds + td.days * _SECONDS_PER_DAY
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if len(nano_value) > 9:
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raise ValueError(
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'Failed to parse Timestamp: nanos {0} more than '
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'9 fractional digits.'.format(nano_value))
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if nano_value:
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nanos = round(float('0.' + nano_value) * 1e9)
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else:
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nanos = 0
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# Parse timezone offsets.
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if value[timezone_offset] == 'Z':
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if len(value) != timezone_offset + 1:
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raise ValueError('Failed to parse timestamp: invalid trailing'
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' data {0}.'.format(value))
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else:
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timezone = value[timezone_offset:]
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pos = timezone.find(':')
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if pos == -1:
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raise ValueError(
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'Invalid timezone offset value: {0}.'.format(timezone))
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if timezone[0] == '+':
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seconds -= (int(timezone[1:pos])*60+int(timezone[pos+1:]))*60
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else:
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seconds += (int(timezone[1:pos])*60+int(timezone[pos+1:]))*60
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# Set seconds and nanos
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self.seconds = int(seconds)
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self.nanos = int(nanos)
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def GetCurrentTime(self):
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"""Get the current UTC into Timestamp."""
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self.FromDatetime(datetime.datetime.utcnow())
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def ToNanoseconds(self):
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"""Converts Timestamp to nanoseconds since epoch."""
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return self.seconds * _NANOS_PER_SECOND + self.nanos
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def ToMicroseconds(self):
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"""Converts Timestamp to microseconds since epoch."""
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return (self.seconds * _MICROS_PER_SECOND +
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self.nanos // _NANOS_PER_MICROSECOND)
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def ToMilliseconds(self):
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"""Converts Timestamp to milliseconds since epoch."""
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return (self.seconds * _MILLIS_PER_SECOND +
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self.nanos // _NANOS_PER_MILLISECOND)
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def ToSeconds(self):
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"""Converts Timestamp to seconds since epoch."""
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return self.seconds
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def FromNanoseconds(self, nanos):
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"""Converts nanoseconds since epoch to Timestamp."""
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self.seconds = nanos // _NANOS_PER_SECOND
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self.nanos = nanos % _NANOS_PER_SECOND
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def FromMicroseconds(self, micros):
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"""Converts microseconds since epoch to Timestamp."""
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self.seconds = micros // _MICROS_PER_SECOND
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self.nanos = (micros % _MICROS_PER_SECOND) * _NANOS_PER_MICROSECOND
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def FromMilliseconds(self, millis):
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"""Converts milliseconds since epoch to Timestamp."""
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self.seconds = millis // _MILLIS_PER_SECOND
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self.nanos = (millis % _MILLIS_PER_SECOND) * _NANOS_PER_MILLISECOND
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def FromSeconds(self, seconds):
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"""Converts seconds since epoch to Timestamp."""
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self.seconds = seconds
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self.nanos = 0
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def ToDatetime(self, tzinfo=None):
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"""Converts Timestamp to a datetime.
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Args:
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tzinfo: A datetime.tzinfo subclass; defaults to None.
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Returns:
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If tzinfo is None, returns a timezone-naive UTC datetime (with no timezone
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information, i.e. not aware that it's UTC).
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Otherwise, returns a timezone-aware datetime in the input timezone.
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"""
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delta = datetime.timedelta(
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seconds=self.seconds,
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microseconds=_RoundTowardZero(self.nanos, _NANOS_PER_MICROSECOND))
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if tzinfo is None:
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return _EPOCH_DATETIME_NAIVE + delta
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else:
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return _EPOCH_DATETIME_AWARE.astimezone(tzinfo) + delta
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def FromDatetime(self, dt):
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"""Converts datetime to Timestamp.
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Args:
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dt: A datetime. If it's timezone-naive, it's assumed to be in UTC.
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"""
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# Using this guide: http://wiki.python.org/moin/WorkingWithTime
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# And this conversion guide: http://docs.python.org/library/time.html
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# Turn the date parameter into a tuple (struct_time) that can then be
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# manipulated into a long value of seconds. During the conversion from
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# struct_time to long, the source date in UTC, and so it follows that the
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# correct transformation is calendar.timegm()
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self.seconds = calendar.timegm(dt.utctimetuple())
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self.nanos = dt.microsecond * _NANOS_PER_MICROSECOND
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class Duration(object):
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"""Class for Duration message type."""
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__slots__ = ()
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def ToJsonString(self):
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"""Converts Duration to string format.
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Returns:
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A string converted from self. The string format will contains
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3, 6, or 9 fractional digits depending on the precision required to
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represent the exact Duration value. For example: "1s", "1.010s",
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"1.000000100s", "-3.100s"
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"""
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_CheckDurationValid(self.seconds, self.nanos)
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if self.seconds < 0 or self.nanos < 0:
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result = '-'
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seconds = - self.seconds + int((0 - self.nanos) // 1e9)
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nanos = (0 - self.nanos) % 1e9
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else:
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result = ''
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seconds = self.seconds + int(self.nanos // 1e9)
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nanos = self.nanos % 1e9
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result += '%d' % seconds
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if (nanos % 1e9) == 0:
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# If there are 0 fractional digits, the fractional
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# point '.' should be omitted when serializing.
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return result + 's'
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if (nanos % 1e6) == 0:
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# Serialize 3 fractional digits.
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return result + '.%03ds' % (nanos / 1e6)
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if (nanos % 1e3) == 0:
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# Serialize 6 fractional digits.
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return result + '.%06ds' % (nanos / 1e3)
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# Serialize 9 fractional digits.
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return result + '.%09ds' % nanos
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def FromJsonString(self, value):
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"""Converts a string to Duration.
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Args:
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value: A string to be converted. The string must end with 's'. Any
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fractional digits (or none) are accepted as long as they fit into
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precision. For example: "1s", "1.01s", "1.0000001s", "-3.100s
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Raises:
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ValueError: On parsing problems.
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"""
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if not isinstance(value, str):
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raise ValueError('Duration JSON value not a string: {!r}'.format(value))
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if len(value) < 1 or value[-1] != 's':
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raise ValueError(
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'Duration must end with letter "s": {0}.'.format(value))
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try:
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pos = value.find('.')
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if pos == -1:
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seconds = int(value[:-1])
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nanos = 0
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else:
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seconds = int(value[:pos])
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if value[0] == '-':
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nanos = int(round(float('-0{0}'.format(value[pos: -1])) *1e9))
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else:
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nanos = int(round(float('0{0}'.format(value[pos: -1])) *1e9))
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_CheckDurationValid(seconds, nanos)
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self.seconds = seconds
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self.nanos = nanos
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except ValueError as e:
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raise ValueError(
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'Couldn\'t parse duration: {0} : {1}.'.format(value, e))
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def ToNanoseconds(self):
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"""Converts a Duration to nanoseconds."""
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return self.seconds * _NANOS_PER_SECOND + self.nanos
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def ToMicroseconds(self):
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"""Converts a Duration to microseconds."""
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micros = _RoundTowardZero(self.nanos, _NANOS_PER_MICROSECOND)
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return self.seconds * _MICROS_PER_SECOND + micros
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def ToMilliseconds(self):
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"""Converts a Duration to milliseconds."""
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millis = _RoundTowardZero(self.nanos, _NANOS_PER_MILLISECOND)
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return self.seconds * _MILLIS_PER_SECOND + millis
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def ToSeconds(self):
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"""Converts a Duration to seconds."""
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return self.seconds
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def FromNanoseconds(self, nanos):
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"""Converts nanoseconds to Duration."""
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self._NormalizeDuration(nanos // _NANOS_PER_SECOND,
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nanos % _NANOS_PER_SECOND)
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def FromMicroseconds(self, micros):
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"""Converts microseconds to Duration."""
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self._NormalizeDuration(
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micros // _MICROS_PER_SECOND,
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(micros % _MICROS_PER_SECOND) * _NANOS_PER_MICROSECOND)
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def FromMilliseconds(self, millis):
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"""Converts milliseconds to Duration."""
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self._NormalizeDuration(
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millis // _MILLIS_PER_SECOND,
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(millis % _MILLIS_PER_SECOND) * _NANOS_PER_MILLISECOND)
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def FromSeconds(self, seconds):
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"""Converts seconds to Duration."""
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self.seconds = seconds
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self.nanos = 0
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def ToTimedelta(self):
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"""Converts Duration to timedelta."""
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return datetime.timedelta(
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seconds=self.seconds, microseconds=_RoundTowardZero(
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self.nanos, _NANOS_PER_MICROSECOND))
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def FromTimedelta(self, td):
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"""Converts timedelta to Duration."""
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self._NormalizeDuration(td.seconds + td.days * _SECONDS_PER_DAY,
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td.microseconds * _NANOS_PER_MICROSECOND)
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def _NormalizeDuration(self, seconds, nanos):
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"""Set Duration by seconds and nanos."""
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# Force nanos to be negative if the duration is negative.
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if seconds < 0 and nanos > 0:
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seconds += 1
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nanos -= _NANOS_PER_SECOND
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self.seconds = seconds
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self.nanos = nanos
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|
||
|
def _CheckDurationValid(seconds, nanos):
|
||
|
if seconds < -_DURATION_SECONDS_MAX or seconds > _DURATION_SECONDS_MAX:
|
||
|
raise ValueError(
|
||
|
'Duration is not valid: Seconds {0} must be in range '
|
||
|
'[-315576000000, 315576000000].'.format(seconds))
|
||
|
if nanos <= -_NANOS_PER_SECOND or nanos >= _NANOS_PER_SECOND:
|
||
|
raise ValueError(
|
||
|
'Duration is not valid: Nanos {0} must be in range '
|
||
|
'[-999999999, 999999999].'.format(nanos))
|
||
|
if (nanos < 0 and seconds > 0) or (nanos > 0 and seconds < 0):
|
||
|
raise ValueError(
|
||
|
'Duration is not valid: Sign mismatch.')
|
||
|
|
||
|
|
||
|
def _RoundTowardZero(value, divider):
|
||
|
"""Truncates the remainder part after division."""
|
||
|
# For some languages, the sign of the remainder is implementation
|
||
|
# dependent if any of the operands is negative. Here we enforce
|
||
|
# "rounded toward zero" semantics. For example, for (-5) / 2 an
|
||
|
# implementation may give -3 as the result with the remainder being
|
||
|
# 1. This function ensures we always return -2 (closer to zero).
|
||
|
result = value // divider
|
||
|
remainder = value % divider
|
||
|
if result < 0 and remainder > 0:
|
||
|
return result + 1
|
||
|
else:
|
||
|
return result
|
||
|
|
||
|
|
||
|
def _SetStructValue(struct_value, value):
|
||
|
if value is None:
|
||
|
struct_value.null_value = 0
|
||
|
elif isinstance(value, bool):
|
||
|
# Note: this check must come before the number check because in Python
|
||
|
# True and False are also considered numbers.
|
||
|
struct_value.bool_value = value
|
||
|
elif isinstance(value, str):
|
||
|
struct_value.string_value = value
|
||
|
elif isinstance(value, (int, float)):
|
||
|
struct_value.number_value = value
|
||
|
elif isinstance(value, (dict, Struct)):
|
||
|
struct_value.struct_value.Clear()
|
||
|
struct_value.struct_value.update(value)
|
||
|
elif isinstance(value, (list, ListValue)):
|
||
|
struct_value.list_value.Clear()
|
||
|
struct_value.list_value.extend(value)
|
||
|
else:
|
||
|
raise ValueError('Unexpected type')
|
||
|
|
||
|
|
||
|
def _GetStructValue(struct_value):
|
||
|
which = struct_value.WhichOneof('kind')
|
||
|
if which == 'struct_value':
|
||
|
return struct_value.struct_value
|
||
|
elif which == 'null_value':
|
||
|
return None
|
||
|
elif which == 'number_value':
|
||
|
return struct_value.number_value
|
||
|
elif which == 'string_value':
|
||
|
return struct_value.string_value
|
||
|
elif which == 'bool_value':
|
||
|
return struct_value.bool_value
|
||
|
elif which == 'list_value':
|
||
|
return struct_value.list_value
|
||
|
elif which is None:
|
||
|
raise ValueError('Value not set')
|
||
|
|
||
|
|
||
|
class Struct(object):
|
||
|
"""Class for Struct message type."""
|
||
|
|
||
|
__slots__ = ()
|
||
|
|
||
|
def __getitem__(self, key):
|
||
|
return _GetStructValue(self.fields[key])
|
||
|
|
||
|
def __contains__(self, item):
|
||
|
return item in self.fields
|
||
|
|
||
|
def __setitem__(self, key, value):
|
||
|
_SetStructValue(self.fields[key], value)
|
||
|
|
||
|
def __delitem__(self, key):
|
||
|
del self.fields[key]
|
||
|
|
||
|
def __len__(self):
|
||
|
return len(self.fields)
|
||
|
|
||
|
def __iter__(self):
|
||
|
return iter(self.fields)
|
||
|
|
||
|
def keys(self): # pylint: disable=invalid-name
|
||
|
return self.fields.keys()
|
||
|
|
||
|
def values(self): # pylint: disable=invalid-name
|
||
|
return [self[key] for key in self]
|
||
|
|
||
|
def items(self): # pylint: disable=invalid-name
|
||
|
return [(key, self[key]) for key in self]
|
||
|
|
||
|
def get_or_create_list(self, key):
|
||
|
"""Returns a list for this key, creating if it didn't exist already."""
|
||
|
if not self.fields[key].HasField('list_value'):
|
||
|
# Clear will mark list_value modified which will indeed create a list.
|
||
|
self.fields[key].list_value.Clear()
|
||
|
return self.fields[key].list_value
|
||
|
|
||
|
def get_or_create_struct(self, key):
|
||
|
"""Returns a struct for this key, creating if it didn't exist already."""
|
||
|
if not self.fields[key].HasField('struct_value'):
|
||
|
# Clear will mark struct_value modified which will indeed create a struct.
|
||
|
self.fields[key].struct_value.Clear()
|
||
|
return self.fields[key].struct_value
|
||
|
|
||
|
def update(self, dictionary): # pylint: disable=invalid-name
|
||
|
for key, value in dictionary.items():
|
||
|
_SetStructValue(self.fields[key], value)
|
||
|
|
||
|
collections.abc.MutableMapping.register(Struct)
|
||
|
|
||
|
|
||
|
class ListValue(object):
|
||
|
"""Class for ListValue message type."""
|
||
|
|
||
|
__slots__ = ()
|
||
|
|
||
|
def __len__(self):
|
||
|
return len(self.values)
|
||
|
|
||
|
def append(self, value):
|
||
|
_SetStructValue(self.values.add(), value)
|
||
|
|
||
|
def extend(self, elem_seq):
|
||
|
for value in elem_seq:
|
||
|
self.append(value)
|
||
|
|
||
|
def __getitem__(self, index):
|
||
|
"""Retrieves item by the specified index."""
|
||
|
return _GetStructValue(self.values.__getitem__(index))
|
||
|
|
||
|
def __setitem__(self, index, value):
|
||
|
_SetStructValue(self.values.__getitem__(index), value)
|
||
|
|
||
|
def __delitem__(self, key):
|
||
|
del self.values[key]
|
||
|
|
||
|
def items(self):
|
||
|
for i in range(len(self)):
|
||
|
yield self[i]
|
||
|
|
||
|
def add_struct(self):
|
||
|
"""Appends and returns a struct value as the next value in the list."""
|
||
|
struct_value = self.values.add().struct_value
|
||
|
# Clear will mark struct_value modified which will indeed create a struct.
|
||
|
struct_value.Clear()
|
||
|
return struct_value
|
||
|
|
||
|
def add_list(self):
|
||
|
"""Appends and returns a list value as the next value in the list."""
|
||
|
list_value = self.values.add().list_value
|
||
|
# Clear will mark list_value modified which will indeed create a list.
|
||
|
list_value.Clear()
|
||
|
return list_value
|
||
|
|
||
|
collections.abc.MutableSequence.register(ListValue)
|
||
|
|
||
|
|
||
|
# LINT.IfChange(wktbases)
|
||
|
WKTBASES = {
|
||
|
'google.protobuf.Any': Any,
|
||
|
'google.protobuf.Duration': Duration,
|
||
|
'google.protobuf.FieldMask': FieldMask,
|
||
|
'google.protobuf.ListValue': ListValue,
|
||
|
'google.protobuf.Struct': Struct,
|
||
|
'google.protobuf.Timestamp': Timestamp,
|
||
|
}
|
||
|
# LINT.ThenChange(//depot/google.protobuf/compiler/python/pyi_generator.cc:wktbases)
|