151 lines
6.3 KiB
Python
151 lines
6.3 KiB
Python
# Copyright 2014-present MongoDB, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Tools for specifying BSON codec options."""
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import datetime
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from collections import namedtuple
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from bson.py3compat import abc, string_type
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from bson.binary import (ALL_UUID_REPRESENTATIONS,
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PYTHON_LEGACY,
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UUID_REPRESENTATION_NAMES)
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_RAW_BSON_DOCUMENT_MARKER = 101
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def _raw_document_class(document_class):
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"""Determine if a document_class is a RawBSONDocument class."""
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marker = getattr(document_class, '_type_marker', None)
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return marker == _RAW_BSON_DOCUMENT_MARKER
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_options_base = namedtuple(
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'CodecOptions',
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('document_class', 'tz_aware', 'uuid_representation',
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'unicode_decode_error_handler', 'tzinfo'))
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class CodecOptions(_options_base):
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"""Encapsulates BSON options used in CRUD operations.
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:Parameters:
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- `document_class`: BSON documents returned in queries will be decoded
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to an instance of this class. Must be a subclass of
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:class:`~collections.MutableMapping`. Defaults to :class:`dict`.
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- `tz_aware`: If ``True``, BSON datetimes will be decoded to timezone
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aware instances of :class:`~datetime.datetime`. Otherwise they will be
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naive. Defaults to ``False``.
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- `uuid_representation`: The BSON representation to use when encoding
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and decoding instances of :class:`~uuid.UUID`. Defaults to
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:data:`~bson.binary.PYTHON_LEGACY`.
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- `unicode_decode_error_handler`: The error handler to use when decoding
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an invalid BSON string. Valid options include 'strict', 'replace', and
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'ignore'. Defaults to 'strict'.
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- `tzinfo`: A :class:`~datetime.tzinfo` subclass that specifies the
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timezone to/from which :class:`~datetime.datetime` objects should be
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encoded/decoded.
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.. warning:: Care must be taken when changing
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`unicode_decode_error_handler` from its default value ('strict').
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The 'replace' and 'ignore' modes should not be used when documents
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retrieved from the server will be modified in the client application
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and stored back to the server.
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"""
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def __new__(cls, document_class=dict,
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tz_aware=False, uuid_representation=PYTHON_LEGACY,
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unicode_decode_error_handler="strict",
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tzinfo=None):
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if not (issubclass(document_class, abc.MutableMapping) or
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_raw_document_class(document_class)):
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raise TypeError("document_class must be dict, bson.son.SON, "
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"bson.raw_bson.RawBSONDocument, or a "
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"sublass of collections.MutableMapping")
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if not isinstance(tz_aware, bool):
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raise TypeError("tz_aware must be True or False")
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if uuid_representation not in ALL_UUID_REPRESENTATIONS:
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raise ValueError("uuid_representation must be a value "
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"from bson.binary.ALL_UUID_REPRESENTATIONS")
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if not isinstance(unicode_decode_error_handler, (string_type, None)):
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raise ValueError("unicode_decode_error_handler must be a string "
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"or None")
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if tzinfo is not None:
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if not isinstance(tzinfo, datetime.tzinfo):
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raise TypeError(
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"tzinfo must be an instance of datetime.tzinfo")
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if not tz_aware:
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raise ValueError(
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"cannot specify tzinfo without also setting tz_aware=True")
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return tuple.__new__(
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cls, (document_class, tz_aware, uuid_representation,
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unicode_decode_error_handler, tzinfo))
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def _arguments_repr(self):
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"""Representation of the arguments used to create this object."""
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document_class_repr = (
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'dict' if self.document_class is dict
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else repr(self.document_class))
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uuid_rep_repr = UUID_REPRESENTATION_NAMES.get(self.uuid_representation,
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self.uuid_representation)
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return ('document_class=%s, tz_aware=%r, uuid_representation='
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'%s, unicode_decode_error_handler=%r, tzinfo=%r' %
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(document_class_repr, self.tz_aware, uuid_rep_repr,
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self.unicode_decode_error_handler, self.tzinfo))
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def __repr__(self):
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return '%s(%s)' % (self.__class__.__name__, self._arguments_repr())
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def with_options(self, **kwargs):
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"""Make a copy of this CodecOptions, overriding some options::
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>>> from bson.codec_options import DEFAULT_CODEC_OPTIONS
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>>> DEFAULT_CODEC_OPTIONS.tz_aware
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False
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>>> options = DEFAULT_CODEC_OPTIONS.with_options(tz_aware=True)
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>>> options.tz_aware
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True
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.. versionadded:: 3.5
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"""
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return CodecOptions(
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kwargs.get('document_class', self.document_class),
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kwargs.get('tz_aware', self.tz_aware),
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kwargs.get('uuid_representation', self.uuid_representation),
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kwargs.get('unicode_decode_error_handler',
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self.unicode_decode_error_handler),
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kwargs.get('tzinfo', self.tzinfo))
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DEFAULT_CODEC_OPTIONS = CodecOptions()
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def _parse_codec_options(options):
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"""Parse BSON codec options."""
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return CodecOptions(
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document_class=options.get(
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'document_class', DEFAULT_CODEC_OPTIONS.document_class),
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tz_aware=options.get(
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'tz_aware', DEFAULT_CODEC_OPTIONS.tz_aware),
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uuid_representation=options.get(
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'uuidrepresentation', DEFAULT_CODEC_OPTIONS.uuid_representation),
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unicode_decode_error_handler=options.get(
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'unicode_decode_error_handler',
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DEFAULT_CODEC_OPTIONS.unicode_decode_error_handler),
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tzinfo=options.get('tzinfo', DEFAULT_CODEC_OPTIONS.tzinfo))
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