Source code for linkd.utils

# -*- coding: utf-8 -*-
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from __future__ import annotations

__all__ = ["Marker", "MaybeAwaitable", "get_dependency_id", "maybe_await"]

import functools
import inspect
import typing as t

T = t.TypeVar("T")

MaybeAwaitable: t.TypeAlias = t.Union[T, t.Coroutine[t.Any, t.Any, T]]
"""TypeAlias for an item that might be able to be awaited."""

ANNOTATION_PARSE_LOCAL_INCLUDE_MODULES: set[str] = {"linkd"}
"""
Modules that will be included into the locals dict when parsing injected function annotations.
Only modify this if you know what you are doing.
"""




class Marker:
    """
    Simple class intended to be used in place of when you'd use an object as a marker, in order
    to provide a better repr.

    Args:
        name: The name of the marker.

    Example:

        .. code-block:: python

            >>> FOO = object()
            >>> FOO
            <object object at 0x104cdc5f0>
            >>> BAR = Marker("BAR")
            >>> BAR
            <linkd.Marker: BAR>
    """

    __slots__ = ("_name",)

    def __init__(self, name: str) -> None:
        self._name = name

    def __repr__(self) -> str:
        return f"<linkd.{self.__class__.__name__}: {self._name!r}>"





@functools.cache
def get_dependency_id(dependency_type: t.Any) -> str:
    """
    Get the dependency id of the given type. This is used when storing and retrieving dependencies from registries
    and containers.

    Args:
        dependency_type: The type to get the dependency id for.

    Returns:
        The dependency id for the given type.
    """
    return f"{dependency_type.__module__}.{getattr(dependency_type, '__qualname__', dependency_type.__name__)}"





async def maybe_await(item: MaybeAwaitable[T]) -> T:
    """
    Await the given item if it is a coroutine, otherwise just return the given item.

    Args:
        item: The item to maybe await.

    Returns:
        The item, or the return once the item was awaited.
    """
    if inspect.iscoroutine(item):
        return await item
    return t.cast("T", item)