Source code for runway.cfngin.hooks.protocols

"""Protocols for structural typing.

For more information on protocols, refer to
`PEP 544 <https://www.python.org/dev/peps/pep-0544/>`__.

"""
from __future__ import annotations

from abc import abstractmethod
from typing import TYPE_CHECKING, Any, Optional, TypeVar, Union, overload

from typing_extensions import Protocol, runtime_checkable

if TYPE_CHECKING:
    from ...context import CfnginContext


_T = TypeVar("_T")


[docs]class CfnginHookArgsProtocol(Protocol): """Protocol for CFNgin hook arguments class. This class defines a structural interface for all CFNgin hook argument classes. It is recommended to use the provided base class in place of this when authoring a new argument class. """ @overload @abstractmethod def get(self, __name: str) -> Optional[Any]: ... @overload @abstractmethod def get(self, __name: str, __default: Union[Any, _T]) -> Union[Any, _T]: ...
[docs] @abstractmethod def get(self, __name: str, __default: Union[Any, _T] = None) -> Union[Any, _T]: """Safely get the value of an attribute. Args: name: Attribute name to return the value for. default: Value to return if attribute is not found. """ raise NotImplementedError
@abstractmethod def __contains__(self, __name: str) -> bool: raise NotImplementedError @abstractmethod def __getattribute__(self, __name: str) -> Any: raise NotImplementedError @abstractmethod def __getitem__(self, __name: str) -> Any: raise NotImplementedError @abstractmethod def __setitem__(self, __name: str, _value: Any) -> None: raise NotImplementedError
[docs]@runtime_checkable class CfnginHookProtocol(Protocol): """Protocol for CFNgin hooks. This class defines a structural interface for all CFNgin hook classes. Classes used for hooks do not need to subclass this hook. They only need to implement a similar interface. While not required, it is still acceptable to subclass this class for full type checking of a hook class. """ args: CfnginHookArgsProtocol """Arguments passed to the hook and parsed into an object."""
[docs] @abstractmethod def __init__( # pylint: disable=super-init-not-called self, context: CfnginContext, **_kwargs: Any ) -> None: """Structural __init__ method. This should not be called. Pylint will erroneously warn about "super-init-not-called" if using this class as a subclass. This should be disabled in-line until the bug reports for this issue is resolved. """ raise NotImplementedError
[docs] @abstractmethod def post_deploy(self) -> Any: """Run during the **post_deploy** stage. Returns: A "truthy" value if the hook was successful or a "falsy" value if the hook failed. """ raise NotImplementedError
[docs] @abstractmethod def post_destroy(self) -> Any: """Run during the **post_destroy** stage. Returns: A "truthy" value if the hook was successful or a "falsy" value if the hook failed. """ raise NotImplementedError
[docs] @abstractmethod def pre_deploy(self) -> Any: """Run during the **pre_deploy** stage. Returns: A "truthy" value if the hook was successful or a "falsy" value if the hook failed. """ raise NotImplementedError
[docs] @abstractmethod def pre_destroy(self) -> Any: """Run during the **pre_destroy** stage. Returns: A "truthy" value if the hook was successful or a "falsy" value if the hook failed. """ raise NotImplementedError