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"""
This module is the requests implementation of Pipeline ABC
"""
from __future__ import absolute_import # we have a "requests" module that conflicts with "requests" on Py2.7
import contextlib
import logging
import threading
from typing import TYPE_CHECKING, List, Callable, Iterator, Any, Union, Dict, Optional # pylint: disable=unused-import
import warnings
from oauthlib import oauth2
import requests
from requests.models import CONTENT_CHUNK_SIZE
from urllib3 import Retry # Needs requests 2.16 at least to be safe
from ..exceptions import (
TokenExpiredError,
ClientRequestError,
raise_with_traceback
)
from ..universal_http import ClientRequest
from ..universal_http.requests import BasicRequestsHTTPSender
from . import HTTPSender, HTTPPolicy, Response, Request
_LOGGER = logging.getLogger(__name__)
class RequestsCredentialsPolicy(HTTPPolicy):
"""Implementation of request-oauthlib except and retry logic.
"""
def __init__(self, credentials):
super(RequestsCredentialsPolicy, self).__init__()
self._creds = credentials
def send(self, request, **kwargs):
session = request.context.session
try:
self._creds.signed_session(session)
except TypeError: # Credentials does not support session injection
_LOGGER.warning("Your credentials class does not support session injection. Performance will not be at the maximum.")
request.context.session = session = self._creds.signed_session()
try:
try:
return self.next.send(request, **kwargs)
except (oauth2.rfc6749.errors.InvalidGrantError,
oauth2.rfc6749.errors.TokenExpiredError) as err:
error = "Token expired or is invalid. Attempting to refresh."
_LOGGER.warning(error)
try:
try:
self._creds.refresh_session(session)
except TypeError: # Credentials does not support session injection
_LOGGER.warning("Your credentials class does not support session injection. Performance will not be at the maximum.")
request.context.session = session = self._creds.refresh_session()
return self.next.send(request, **kwargs)
except (oauth2.rfc6749.errors.InvalidGrantError,
oauth2.rfc6749.errors.TokenExpiredError) as err:
msg = "Token expired or is invalid."
raise_with_traceback(TokenExpiredError, msg, err)
except (requests.RequestException,
oauth2.rfc6749.errors.OAuth2Error) as err:
msg = "Error occurred in request."
raise_with_traceback(ClientRequestError, msg, err)
class RequestsPatchSession(HTTPPolicy):
"""Implements request level configuration
that are actually to be done at the session level.
This is highly deprecated, and is totally legacy.
The pipeline structure allows way better design for this.
"""
_protocols = ['http://', 'https://']
def send(self, request, **kwargs):
"""Patch the current session with Request level operation config.
This is deprecated, we shouldn't patch the session with
arguments at the Request, and "config" should be used.
"""
session = request.context.session
old_max_redirects = None
if 'max_redirects' in kwargs:
warnings.warn("max_redirects in operation kwargs is deprecated, use config.redirect_policy instead",
DeprecationWarning)
old_max_redirects = session.max_redirects
session.max_redirects = int(kwargs['max_redirects'])
old_trust_env = None
if 'use_env_proxies' in kwargs:
warnings.warn("use_env_proxies in operation kwargs is deprecated, use config.proxies instead",
DeprecationWarning)
old_trust_env = session.trust_env
session.trust_env = bool(kwargs['use_env_proxies'])
old_retries = {}
if 'retries' in kwargs:
warnings.warn("retries in operation kwargs is deprecated, use config.retry_policy instead",
DeprecationWarning)
max_retries = kwargs['retries']
for protocol in self._protocols:
old_retries[protocol] = session.adapters[protocol].max_retries
session.adapters[protocol].max_retries = max_retries
try:
return self.next.send(request, **kwargs)
finally:
if old_max_redirects:
session.max_redirects = old_max_redirects
if old_trust_env:
session.trust_env = old_trust_env
if old_retries:
for protocol in self._protocols:
session.adapters[protocol].max_retries = old_retries[protocol]
class RequestsContext(object):
def __init__(self, session):
self.session = session
class PipelineRequestsHTTPSender(HTTPSender):
"""Implements a basic Pipeline, that supports universal HTTP lib "requests" driver.
"""
def __init__(self, universal_http_requests_driver=None):
# type: (Optional[BasicRequestsHTTPSender]) -> None
self.driver = universal_http_requests_driver or BasicRequestsHTTPSender()
def __enter__(self):
# type: () -> PipelineRequestsHTTPSender
self.driver.__enter__()
return self
def __exit__(self, *exc_details): # pylint: disable=arguments-differ
self.driver.__exit__(*exc_details)
def close(self):
self.__exit__()
def build_context(self):
# type: () -> RequestsContext
return RequestsContext(
session=self.driver.session,
)
def send(self, request, **kwargs):
# type: (Request[ClientRequest], Any) -> Response
"""Send request object according to configuration.
:param Request request: The request object to be sent.
"""
if request.context is None: # Should not happen, but make mypy happy and does not hurt
request.context = self.build_context()
if request.context.session is not self.driver.session:
kwargs['session'] = request.context.session
return Response(
request,
self.driver.send(request.http_request, **kwargs)
)