"""xmlrpclib.Transport implementation
"""

import logging
import urllib.parse
import xmlrpc.client
from typing import TYPE_CHECKING, Tuple

from pip._internal.exceptions import NetworkConnectionError
from pip._internal.network.session import PipSession
from pip._internal.network.utils import raise_for_status

if TYPE_CHECKING:
    from xmlrpc.client import _HostType, _Marshallable

logger = logging.getLogger(__name__)


class PipXmlrpcTransport(xmlrpc.client.Transport):
    """Provide a `xmlrpclib.Transport` implementation via a `PipSession`
    object.
    """

    def __init__(self, index_url, session, use_datetime=False):
        # type: (str, PipSession, bool) -> None
        super().__init__(use_datetime)
        index_parts = urllib.parse.urlparse(index_url)
        self._scheme = index_parts.scheme
        self._session = session

    def request(self, host, handler, request_body, verbose=False):
        # type: (_HostType, str, bytes, bool) -> Tuple[_Marshallable, ...]
        assert isinstance(host, str)
        parts = (self._scheme, host, handler, None, None, None)
        url = urllib.parse.urlunparse(parts)
        try:
            headers = {'Content-Type': 'text/xml'}
            response = self._session.post(url, data=request_body,
                                          headers=headers, stream=True)
            raise_for_status(response)
            self.verbose = verbose
            return self.parse_response(response.raw)
        except NetworkConnectionError as exc:
            assert exc.response
            logger.critical(
                "HTTP error %s while getting %s",
                exc.response.status_code, url,
            )
            raise
