Created
December 4, 2014 18:39
-
-
Save xianyunwuxin/5ae664ce6f8b3f6b7878 to your computer and use it in GitHub Desktop.
like Mongodb's ObjectID
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
# coding:utf8 | |
# object_id.py | |
__all__ = ('ObjectID', ) | |
from __future__ import print_function | |
from __future__ import unicode_literals | |
import os | |
import struct | |
import socket | |
import sys | |
from hashlib import md5 | |
import time | |
import itertools | |
import binascii | |
PY3 = sys.version_info[0] == 3 | |
def _object_id(): | |
range_ = range | |
if not PY3: | |
range_ = xrange | |
iter_ = itertools.cycle(range_(0xffffff)) | |
machine = md5(socket.gethostname().encode('utf8')).digest()[:3] | |
pid = struct.pack('>L', os.getpid()) | |
def f(as_bytes=False): | |
now = struct.pack('>L', int(time.time())) | |
inc = struct.pack('>L', next(iter_))[1:] | |
result = b''.join( | |
(now, machine, pid, inc) | |
) | |
return result | |
return f | |
object_id = _object_id() | |
class ObjectID(object): | |
def __init__(self, val=None): | |
if not val: | |
self.bytes = object_id() | |
elif type(val) is bytes: | |
self.bytes = val | |
else: | |
self.string = val | |
@property | |
def string(self): | |
return self._string | |
@string.setter | |
def string(self, val): | |
self._string = val | |
self._bytes = binascii.unhexlify(val) | |
@property | |
def bytes(self): | |
return self._bytes | |
@bytes.setter | |
def bytes(self, val): | |
self._bytes = val | |
self._string = binascii.hexlify(val).decode('utf8') | |
def __str__(self): | |
return self.string | |
if PY3: | |
def __eq__(self, b): | |
return self.bytes == b.bytes | |
else: | |
def __cmp__(self, b): | |
return not self.bytes == b.bytes | |
if __name__ == '__main__': | |
a = ObjectID() | |
b = ObjectID(a.string) | |
c = ObjectID(a.bytes) | |
print(a==b) | |
print(a==c) | |
d = ObjectID() | |
print(a==d) | |
list(map(print, (a, b, c, d))) |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment