256 lines
9.7 KiB
Python
256 lines
9.7 KiB
Python
# -*- coding: utf-8 -*-
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# Part of Odoo, Flectra. See LICENSE file for full copyright and licensing details.
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__all__ = ['synchronized', 'lazy_classproperty', 'lazy_property',
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'classproperty', 'conditional', 'lazy']
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from functools import wraps
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from inspect import getsourcefile
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from json import JSONEncoder
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class lazy_property(object):
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""" Decorator for a lazy property of an object, i.e., an object attribute
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that is determined by the result of a method call evaluated once. To
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reevaluate the property, simply delete the attribute on the object, and
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get it again.
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"""
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def __init__(self, fget):
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self.fget = fget
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def __get__(self, obj, cls):
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if obj is None:
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return self
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value = self.fget(obj)
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setattr(obj, self.fget.__name__, value)
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return value
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@property
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def __doc__(self):
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return self.fget.__doc__
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@staticmethod
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def reset_all(obj):
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""" Reset all lazy properties on the instance `obj`. """
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cls = type(obj)
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obj_dict = vars(obj)
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for name in list(obj_dict):
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if isinstance(getattr(cls, name, None), lazy_property):
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obj_dict.pop(name)
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class lazy_classproperty(lazy_property):
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""" Similar to :class:`lazy_property`, but for classes. """
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def __get__(self, obj, cls):
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val = self.fget(cls)
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setattr(cls, self.fget.__name__, val)
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return val
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def conditional(condition, decorator):
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""" Decorator for a conditionally applied decorator.
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Example:
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@conditional(get_config('use_cache'), ormcache)
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def fn():
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pass
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"""
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if condition:
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return decorator
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else:
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return lambda fn: fn
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def synchronized(lock_attr='_lock'):
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def decorator(func):
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@wraps(func)
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def wrapper(self, *args, **kwargs):
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lock = getattr(self, lock_attr)
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try:
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lock.acquire()
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return func(self, *args, **kwargs)
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finally:
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lock.release()
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return wrapper
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return decorator
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def frame_codeinfo(fframe, back=0):
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""" Return a (filename, line) pair for a previous frame .
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@return (filename, lineno) where lineno is either int or string==''
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"""
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try:
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if not fframe:
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return "<unknown>", ''
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for i in range(back):
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fframe = fframe.f_back
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try:
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fname = getsourcefile(fframe)
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except TypeError:
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fname = '<builtin>'
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lineno = fframe.f_lineno or ''
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return fname, lineno
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except Exception:
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return "<unknown>", ''
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def compose(a, b):
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""" Composes the callables ``a`` and ``b``. ``compose(a, b)(*args)`` is
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equivalent to ``a(b(*args))``.
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Can be used as a decorator by partially applying ``a``::
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@partial(compose, a)
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def b():
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...
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"""
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@wraps(b)
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def wrapper(*args, **kwargs):
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return a(b(*args, **kwargs))
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return wrapper
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class _ClassProperty(property):
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def __get__(self, cls, owner):
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return self.fget.__get__(None, owner)()
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def classproperty(func):
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return _ClassProperty(classmethod(func))
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class lazy(object):
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""" A proxy to the (memoized) result of a lazy evaluation::
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foo = lazy(func, arg) # func(arg) is not called yet
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bar = foo + 1 # eval func(arg) and add 1
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baz = foo + 2 # use result of func(arg) and add 2
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"""
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__slots__ = ['_func', '_args', '_kwargs', '_cached_value']
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def __init__(self, func, *args, **kwargs):
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# bypass own __setattr__
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object.__setattr__(self, '_func', func)
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object.__setattr__(self, '_args', args)
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object.__setattr__(self, '_kwargs', kwargs)
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@property
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def _value(self):
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if self._func is not None:
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value = self._func(*self._args, **self._kwargs)
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object.__setattr__(self, '_func', None)
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object.__setattr__(self, '_args', None)
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object.__setattr__(self, '_kwargs', None)
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object.__setattr__(self, '_cached_value', value)
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return self._cached_value
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def __getattr__(self, name): return getattr(self._value, name)
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def __setattr__(self, name, value): return setattr(self._value, name, value)
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def __delattr__(self, name): return delattr(self._value, name)
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def __repr__(self):
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return repr(self._value) if self._func is None else object.__repr__(self)
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def __str__(self): return str(self._value)
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def __bytes__(self): return bytes(self._value)
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def __format__(self, format_spec): return format(self._value, format_spec)
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def __lt__(self, other): return self._value < other
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def __le__(self, other): return self._value <= other
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def __eq__(self, other): return self._value == other
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def __ne__(self, other): return self._value != other
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def __gt__(self, other): return self._value > other
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def __ge__(self, other): return self._value >= other
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def __hash__(self): return hash(self._value)
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def __bool__(self): return bool(self._value)
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def __call__(self, *args, **kwargs): return self._value(*args, **kwargs)
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def __len__(self): return len(self._value)
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def __getitem__(self, key): return self._value[key]
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def __missing__(self, key): return self._value.__missing__(key)
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def __setitem__(self, key, value): self._value[key] = value
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def __delitem__(self, key): del self._value[key]
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def __iter__(self): return iter(self._value)
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def __reversed__(self): return reversed(self._value)
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def __contains__(self, key): return key in self._value
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def __add__(self, other): return self._value.__add__(other)
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def __sub__(self, other): return self._value.__sub__(other)
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def __mul__(self, other): return self._value.__mul__(other)
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def __matmul__(self, other): return self._value.__matmul__(other)
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def __truediv__(self, other): return self._value.__truediv__(other)
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def __floordiv__(self, other): return self._value.__floordiv__(other)
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def __mod__(self, other): return self._value.__mod__(other)
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def __divmod__(self, other): return self._value.__divmod__(other)
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def __pow__(self, other): return self._value.__pow__(other)
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def __lshift__(self, other): return self._value.__lshift__(other)
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def __rshift__(self, other): return self._value.__rshift__(other)
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def __and__(self, other): return self._value.__and__(other)
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def __xor__(self, other): return self._value.__xor__(other)
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def __or__(self, other): return self._value.__or__(other)
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def __radd__(self, other): return self._value.__radd__(other)
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def __rsub__(self, other): return self._value.__rsub__(other)
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def __rmul__(self, other): return self._value.__rmul__(other)
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def __rmatmul__(self, other): return self._value.__rmatmul__(other)
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def __rtruediv__(self, other): return self._value.__rtruediv__(other)
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def __rfloordiv__(self, other): return self._value.__rfloordiv__(other)
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def __rmod__(self, other): return self._value.__rmod__(other)
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def __rdivmod__(self, other): return self._value.__rdivmod__(other)
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def __rpow__(self, other): return self._value.__rpow__(other)
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def __rlshift__(self, other): return self._value.__rlshift__(other)
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def __rrshift__(self, other): return self._value.__rrshift__(other)
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def __rand__(self, other): return self._value.__rand__(other)
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def __rxor__(self, other): return self._value.__rxor__(other)
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def __ror__(self, other): return self._value.__ror__(other)
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def __iadd__(self, other): return self._value.__iadd__(other)
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def __isub__(self, other): return self._value.__isub__(other)
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def __imul__(self, other): return self._value.__imul__(other)
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def __imatmul__(self, other): return self._value.__imatmul__(other)
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def __itruediv__(self, other): return self._value.__itruediv__(other)
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def __ifloordiv__(self, other): return self._value.__ifloordiv__(other)
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def __imod__(self, other): return self._value.__imod__(other)
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def __ipow__(self, other): return self._value.__ipow__(other)
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def __ilshift__(self, other): return self._value.__ilshift__(other)
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def __irshift__(self, other): return self._value.__irshift__(other)
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def __iand__(self, other): return self._value.__iand__(other)
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def __ixor__(self, other): return self._value.__ixor__(other)
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def __ior__(self, other): return self._value.__ior__(other)
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def __neg__(self): return self._value.__neg__()
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def __pos__(self): return self._value.__pos__()
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def __abs__(self): return self._value.__abs__()
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def __invert__(self): return self._value.__invert__()
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def __complex__(self): return complex(self._value)
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def __int__(self): return int(self._value)
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def __float__(self): return float(self._value)
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def __index__(self): return self._value.__index__()
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def __round__(self): return self._value.__round__()
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def __trunc__(self): return self._value.__trunc__()
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def __floor__(self): return self._value.__floor__()
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def __ceil__(self): return self._value.__ceil__()
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def __enter__(self): return self._value.__enter__()
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def __exit__(self, exc_type, exc_value, traceback):
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return self._value.__exit__(exc_type, exc_value, traceback)
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def __await__(self): return self._value.__await__()
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def __aiter__(self): return self._value.__aiter__()
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def __anext__(self): return self._value.__anext__()
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def __aenter__(self): return self._value.__aenter__()
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def __aexit__(self, exc_type, exc_value, traceback):
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return self._value.__aexit__(exc_type, exc_value, traceback)
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# patch serialization of lazy
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def default(self, o):
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if isinstance(o, lazy):
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return o._value
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return json_encoder_default(self, o)
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json_encoder_default = JSONEncoder.default
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JSONEncoder.default = default
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