| from __future__ import absolute_import |
|
|
| import binascii |
| import weakref |
|
|
| from kafka.vendor import six |
|
|
|
|
| if six.PY3: |
| MAX_INT = 2 ** 31 |
| TO_SIGNED = 2 ** 32 |
|
|
| def crc32(data): |
| crc = binascii.crc32(data) |
| |
| |
| |
| if crc >= MAX_INT: |
| crc -= TO_SIGNED |
| return crc |
| else: |
| from binascii import crc32 |
|
|
|
|
| class WeakMethod(object): |
| """ |
| Callable that weakly references a method and the object it is bound to. It |
| is based on https://stackoverflow.com/a/24287465. |
| |
| Arguments: |
| |
| object_dot_method: A bound instance method (i.e. 'object.method'). |
| """ |
| def __init__(self, object_dot_method): |
| try: |
| self.target = weakref.ref(object_dot_method.__self__) |
| except AttributeError: |
| self.target = weakref.ref(object_dot_method.im_self) |
| self._target_id = id(self.target()) |
| try: |
| self.method = weakref.ref(object_dot_method.__func__) |
| except AttributeError: |
| self.method = weakref.ref(object_dot_method.im_func) |
| self._method_id = id(self.method()) |
|
|
| def __call__(self, *args, **kwargs): |
| """ |
| Calls the method on target with args and kwargs. |
| """ |
| return self.method()(self.target(), *args, **kwargs) |
|
|
| def __hash__(self): |
| return hash(self.target) ^ hash(self.method) |
|
|
| def __eq__(self, other): |
| if not isinstance(other, WeakMethod): |
| return False |
| return self._target_id == other._target_id and self._method_id == other._method_id |
|
|
|
|
| class Dict(dict): |
| """Utility class to support passing weakrefs to dicts |
| |
| See: https://docs.python.org/2/library/weakref.html |
| """ |
| pass |
|
|
