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"""
Core Exceptions
~~~~~~~~~~~~~~~
These exceptions are tied to how **web-poet** operates.
"""
from __future__ import annotations
from typing import TYPE_CHECKING
if TYPE_CHECKING:
from web_poet import HttpRequest
__all__ = [
"NoSavedHttpResponse",
"PageObjectAction",
"RequestDownloaderVarError",
"Retry",
"UseFallback",
]
class RequestDownloaderVarError(Exception):
"""The ``web_poet.request_downloader_var`` had its contents accessed but there
wasn't any value set during the time requests are executed.
See the documentation section about :ref:`setting up the contextvars <setup-contextvars>`
to learn more about this.
"""
class PageObjectAction(ValueError):
"""Base class for exceptions that can be raised from a page object to
indicate something to be done about that page object."""
class Retry(PageObjectAction):
"""The page object found that the input data is partial or empty, and a
request retry may provide better input."""
class UseFallback(PageObjectAction):
"""The page object cannot extract data from the input, but the input seems
valid, so an alternative data extraction implementation for the same item
type may succeed."""
class NoSavedHttpResponse(AssertionError):
"""Indicates that there is no saved response for this request.
Can only be raised when a :class:`~.HttpClient` instance is used to
get saved responses.
:param request: The :class:`~.HttpRequest` instance that was used.
:type request: HttpRequest
"""
def __init__(self, msg: str | None = None, request: HttpRequest | None = None):
self.request = request
if msg is None:
msg = f"There is no saved response available for this HTTP Request: {self.request}"
super().__init__(msg)
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