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"""Common definition.""" |
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# from collections import namedtuple |
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from typing import Any, Awaitable, Callable, List, NamedTuple, Optional, TypeVar, Union |
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__all__ = [ |
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'CallableFunction', |
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'AsyncInnerFunction', |
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'SUCCESS', |
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'FAILURE', |
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'ExceptionDecorator', |
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'NodeMetadata', |
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'node_metadata', |
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] |
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CallableFunction = Union[Callable[..., Awaitable[Any]], Callable] |
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"""Something callable with or without async.""" |
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AsyncInnerFunction = Callable[[], Awaitable[Any]] |
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"""Function signature of async function implementation.""" |
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SUCCESS = True # a success call |
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"""Success constant.""" |
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FAILURE = not SUCCESS # Well defined falsy... |
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"""Failure constant.""" |
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class ExceptionDecorator(Exception): |
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"""ExceptionDecorator exception is a decorator on a real exception. |
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This will ensure that ```assert ExceptionDecorator.__bool__ == False```. |
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This permit to return exception as a 'FAILURE' status. |
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""" |
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def __init__(self, exception: Exception): |
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super().__init__() |
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self.exception = exception |
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def __bool__(self): |
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return False |
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def __repr__(self): |
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return self.exception.__repr__() |
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def __str__(self): |
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return self.exception.__str__() |
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class NodeMetadata(NamedTuple): |
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"""NodeMetadata is our node definition. |
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# Attributes |
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- name (str): named operation |
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- properties (List[str]): a list of property name. |
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- edges (List[str]): a list of member name which act as edges. |
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""" |
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name: str |
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properties: List[str] |
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edges: List[str] |
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T = TypeVar('T', bound=CallableFunction) |
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68
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def node_metadata( # pylint: disable=protected-access |
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name: Optional[str] = None, |
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properties: Optional[List[str]] = None, |
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edges: Optional[List[str]] = None, |
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): |
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"""'node_metadata' is a function decorator which add meta information about node. |
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We add a property on decorated function named '__node_metadata'. |
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# Parameters |
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name (Optional[str]): override name of decorated function, |
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default is function name left striped with '_' |
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properties (Optional[List[str]]): a list of property name ([] as default) |
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edges (Optional[List[str]]): a list of edges name (["child", "children"] as default) |
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# Returns |
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the decorator function |
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""" |
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87
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def decorate_function(function: T) -> T: |
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function.__node_metadata = NodeMetadata( |
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name=name if name else function.__name__.lstrip('_'), |
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properties=properties or [], |
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edges=edges or ['child', 'children'], |
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) |
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return function |
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return decorate_function |
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geronimo-iia /
async-btree
