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from typing import TypeVar, Any
from azure.core.pipeline import PipelineRequest, PipelineResponse
from azure.core.pipeline.transport import HttpResponse as LegacyHttpResponse, HttpRequest as LegacyHttpRequest
from azure.core.rest import HttpResponse, HttpRequest
from ._base import SansIOHTTPPolicy

HTTPResponseType = TypeVar("HTTPResponseType", HttpResponse, LegacyHttpResponse)
HTTPRequestType = TypeVar("HTTPRequestType", HttpRequest, LegacyHttpRequest)


class CustomHookPolicy(SansIOHTTPPolicy[HTTPRequestType, HTTPResponseType]):
    """A simple policy that enable the given callback
    with the response.

    :keyword callback raw_request_hook: Callback function. Will be invoked on request.
    :keyword callback raw_response_hook: Callback function. Will be invoked on response.
    """

    def __init__(self, **kwargs: Any):  # pylint: disable=unused-argument,super-init-not-called
        self._request_callback = kwargs.get("raw_request_hook")
        self._response_callback = kwargs.get("raw_response_hook")

    def on_request(self, request: PipelineRequest[HTTPRequestType]) -> None:
        """This is executed before sending the request to the next policy.

        :param request: The PipelineRequest object.
        :type request: ~azure.core.pipeline.PipelineRequest
        """
        request_callback = request.context.options.pop("raw_request_hook", None)
        if request_callback:
            request.context["raw_request_hook"] = request_callback
            request_callback(request)
        elif self._request_callback:
            self._request_callback(request)

        response_callback = request.context.options.pop("raw_response_hook", None)
        if response_callback:
            request.context["raw_response_hook"] = response_callback

    def on_response(
        self, request: PipelineRequest[HTTPRequestType], response: PipelineResponse[HTTPRequestType, HTTPResponseType]
    ) -> None:
        """This is executed after the request comes back from the policy.

        :param request: The PipelineRequest object.
        :type request: ~azure.core.pipeline.PipelineRequest
        :param response: The PipelineResponse object.
        :type response: ~azure.core.pipeline.PipelineResponse
        """
        response_callback = response.context.get("raw_response_hook")
        if response_callback:
            response_callback(response)
        elif self._response_callback:
            self._response_callback(response)
