Objectid tidak didefinisikan python

# Copyright 2009-2015 MongoDB, 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 # # //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. """Tools for working with MongoDB `ObjectIds <//dochub.mongodb.org/core/objectids>`_. """ import binascii import calendar import datetime import os import struct import threading import time from random import SystemRandom from bson.errors import InvalidId from bson.py3compat import PY3, bytes_from_hex, string_type, text_type from bson.tz_util import utc _MAX_COUNTER_VALUE = 0xFFFFFF def _raise_invalid_id(oid): raise InvalidId( "%r is not a valid ObjectId, it must be a 12-byte input" " or a 24-character hex string" % oid) def _random_bytes(): """Get the 5-byte random field of an ObjectId.""" return os.urandom(5) class ObjectId(object): """A MongoDB ObjectId. """ _pid = os.getpid() _inc = SystemRandom().randint(0, _MAX_COUNTER_VALUE) _inc_lock = threading.Lock() __random = _random_bytes() __slots__ = ('__id',) _type_marker = 7 def __init__(self, oid=None): """Initialize a new ObjectId. An ObjectId is a 12-byte unique identifier consisting of: - a 4-byte value representing the seconds since the Unix epoch, - a 5-byte random value, - a 3-byte counter, starting with a random value. By default, ``ObjectId()`` creates a new unique identifier. The optional parameter `oid` can be an :class:`ObjectId`, or any 12 :class:`bytes` or, in Python 2, any 12-character :class:`str`. For example, the 12 bytes b'foo-bar-quux' do not follow the ObjectId specification but they are acceptable input:: >>> ObjectId(b'foo-bar-quux') ObjectId('666f6f2d6261722d71757578') `oid` can also be a :class:`unicode` or :class:`str` of 24 hex digits:: >>> ObjectId('0123456789ab0123456789ab') ObjectId('0123456789ab0123456789ab') >>> >>> # A u-prefixed unicode literal: >>> ObjectId(u'0123456789ab0123456789ab') ObjectId('0123456789ab0123456789ab') Raises :class:`~bson.errors.InvalidId` if `oid` is not 12 bytes nor 24 hex digits, or :class:`TypeError` if `oid` is not an accepted type. :Parameters: - `oid` (optional): a valid ObjectId. . seealso:: The MongoDB documentation on `ObjectIds`_. . versionchanged:: 3.8 :class:`~bson.objectid.ObjectId` now implements the `ObjectID specification version 0.2 <//github.com/mongodb/specifications/blob/master/source/ objectid.rst>`_. """ if oid is None: self.__generate() elif isinstance(oid, bytes) and len(oid) == 12: self.__id = oid else: self.__validate(oid) @classmethod def from_datetime(cls, generation_time): """Create a dummy ObjectId instance with a specific generation time. This method is useful for doing range queries on a field containing :class:`ObjectId` instances. . warning:: It is not safe to insert a document containing an ObjectId generated using this method. This method deliberately eliminates the uniqueness guarantee that ObjectIds generally provide. ObjectIds generated with this method should be used exclusively in queries. `generation_time` will be converted to UTC. Naive datetime instances will be treated as though they already contain UTC. An example using this helper to get documents where ``"_id"`` was generated before January 1, 2010 would be: >>> gen_time = datetime.datetime(2010, 1, 1) >>> dummy_id = ObjectId.from_datetime(gen_time) >>> result = collection.find({"_id": {"$lt": dummy_id}}) :Parameters: - `generation_time`: :class:`~datetime.datetime` to be used as the generation time for the resulting ObjectId. """ if generation_time.utcoffset() is not None: generation_time = generation_time - generation_time.utcoffset() timestamp = calendar.timegm(generation_time.timetuple()) oid = struct.pack( ">I", int(timestamp)) + b"\x00\x00\x00\x00\x00\x00\x00\x00" return cls(oid) @classmethod def is_valid(cls, oid): """Checks if a `oid` string is valid or not. :Parameters: - `oid`: the object id to validate . versionadded:: 2.3 """ if not oid: return False try: ObjectId(oid) return True except (InvalidId, TypeError): return False @classmethod def _random(cls): """Generate a 5-byte random number once per process. """ pid = os.getpid() if pid != cls._pid: cls._pid = pid cls.__random = _random_bytes() return cls.__random def __generate(self): """Generate a new value for this ObjectId. """ # 4 bytes current time oid = struct.pack(">I", int(time.time())) # 5 bytes random oid += ObjectId._random() # 3 bytes inc with ObjectId._inc_lock: oid += struct.pack(">I", ObjectId._inc)[1:4] ObjectId._inc = (ObjectId._inc + 1) % (_MAX_COUNTER_VALUE + 1) self.__id = oid def __validate(self, oid): """Validate and use the given id for this ObjectId. Raises TypeError if id is not an instance of (:class:`basestring` (:class:`str` or :class:`bytes` in python 3), ObjectId) and InvalidId if it is not a valid ObjectId. :Parameters: - `oid`: a valid ObjectId """ if isinstance(oid, ObjectId): self.__id = oid.binary # bytes or unicode in python 2, str in python 3 elif isinstance(oid, string_type): if len(oid) == 24: try: self.__id = bytes_from_hex(oid) except (TypeError, ValueError): _raise_invalid_id(oid) else: _raise_invalid_id(oid) else: raise TypeError("id must be an instance of (bytes, %s, ObjectId), " "not %s" % (text_type.__name__, type(oid))) @property def binary(self): """12-byte binary representation of this ObjectId. """ return self.__id @property def generation_time(self): """A :class:`datetime.datetime` instance representing the time of generation for this :class:`ObjectId`. The :class:`datetime.datetime` is timezone aware, and represents the generation time in UTC. It is precise to the second. """ timestamp = struct.unpack(">I", self.__id[0:4])[0] return datetime.datetime.fromtimestamp(timestamp, utc) def __getstate__(self): """return value of object for pickling. needed explicitly because __slots__() defined. """ return self.__id def __setstate__(self, value): """explicit state set from pickling """ # Provide backwards compatability with OIDs # pickled with pymongo-1.9 or older. if isinstance(value, dict): oid = value["_ObjectId__id"] else: oid = value # ObjectIds pickled in python 2.x used `str` for __id. # In python 3.x this has to be converted to `bytes` # by encoding latin-1. if PY3 and isinstance(oid, text_type): self.__id = oid.encode('latin-1') else: self.__id = oid def __str__(self): if PY3: return binascii.hexlify(self.__id).decode() return binascii.hexlify(self.__id) def __repr__(self): return "ObjectId('%s')" % (str(self),) def __eq__(self, other): if isinstance(other, ObjectId): return self.__id == other.binary return NotImplemented def __ne__(self, other): if isinstance(other, ObjectId): return self.__id != other.binary return NotImplemented def __lt__(self, other): if isinstance(other, ObjectId): return self.__id < other.binary return NotImplemented def __le__(self, other): if isinstance(other, ObjectId): return self.__id <= other.binary return NotImplemented def __gt__(self, other): if isinstance(other, ObjectId): return self.__id > other.binary return NotImplemented def __ge__(self, other): if isinstance(other, ObjectId): return self.__id >= other.binary return NotImplemented def __hash__(self): """Get a hash value for this :class:`ObjectId`.""" return hash(self.__id)

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