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280"""Stubs for aiohttp HTTP clients"""
import asyncio
import functools
import json
import logging
from http.cookies import CookieError, Morsel, SimpleCookie
from typing import Mapping, Union
from aiohttp import ClientConnectionError, ClientResponse, CookieJar, RequestInfo, hdrs, streams
from aiohttp.helpers import strip_auth_from_url
from multidict import CIMultiDict, CIMultiDictProxy, MultiDict
from yarl import URL
from vcr.errors import CannotOverwriteExistingCassetteException
from vcr.request import Request
log = logging.getLogger(__name__)
class MockStream(asyncio.StreamReader, streams.AsyncStreamReaderMixin):
pass
class MockClientResponse(ClientResponse):
def __init__(self, method, url, request_info=None):
super().__init__(
method=method,
url=url,
writer=None,
continue100=None,
timer=None,
request_info=request_info,
traces=None,
loop=asyncio.get_event_loop(),
session=None,
)
async def json(self, *, encoding="utf-8", loads=json.loads, **kwargs):
stripped = self._body.strip()
if not stripped:
return None
return loads(stripped.decode(encoding))
async def text(self, encoding="utf-8", errors="strict"):
return self._body.decode(encoding, errors=errors)
async def read(self):
return self._body
def release(self):
pass
@property
def content(self):
s = MockStream()
s.feed_data(self._body)
s.feed_eof()
return s
def build_response(vcr_request, vcr_response, history):
request_info = RequestInfo(
url=URL(vcr_request.url),
method=vcr_request.method,
headers=_deserialize_headers(vcr_request.headers),
real_url=URL(vcr_request.url),
)
response = MockClientResponse(vcr_request.method, URL(vcr_request.url), request_info=request_info)
response.status = vcr_response["status"]["code"]
response._body = vcr_response["body"].get("string", b"")
response.reason = vcr_response["status"]["message"]
response._headers = _deserialize_headers(vcr_response["headers"])
response._history = tuple(history)
# cookies
for hdr in response.headers.getall(hdrs.SET_COOKIE, ()):
try:
cookies = SimpleCookie(hdr)
for cookie_name, cookie in cookies.items():
expires = cookie.get("expires", "").strip()
if expires:
log.debug('Ignoring expiration date: %s="%s"', cookie_name, expires)
cookie["expires"] = ""
response.cookies.load(cookie.output(header="").strip())
except CookieError as exc:
log.warning("Can not load response cookies: %s", exc)
response.close()
return response
def _serialize_headers(headers):
"""Serialize CIMultiDictProxy to a pickle-able dict because proxy
objects forbid pickling:
https://github.com/aio-libs/multidict/issues/340
"""
# Mark strings as keys so 'istr' types don't show up in
# the cassettes as comments.
serialized_headers = {}
for k, v in headers.items():
serialized_headers.setdefault(str(k), []).append(v)
return serialized_headers
def _deserialize_headers(headers):
deserialized_headers = CIMultiDict()
for k, vs in headers.items():
if isinstance(vs, list):
for v in vs:
deserialized_headers.add(k, v)
else:
deserialized_headers.add(k, vs)
return CIMultiDictProxy(deserialized_headers)
def play_responses(cassette, vcr_request, kwargs):
history = []
allow_redirects = kwargs.get("allow_redirects", True)
vcr_response = cassette.play_response(vcr_request)
response = build_response(vcr_request, vcr_response, history)
# If we're following redirects, continue playing until we reach
# our final destination.
while allow_redirects and 300 <= response.status <= 399:
if "location" not in response.headers:
break
next_url = URL(response.url).join(URL(response.headers["location"]))
# Make a stub VCR request that we can then use to look up the recorded
# VCR request saved to the cassette. This feels a little hacky and
# may have edge cases based on the headers we're providing (e.g. if
# there's a matcher that is used to filter by headers).
vcr_request = Request("GET", str(next_url), None, _serialize_headers(response.request_info.headers))
vcr_requests = cassette.find_requests_with_most_matches(vcr_request)
for vcr_request, *_ in vcr_requests:
if cassette.can_play_response_for(vcr_request):
break
# Tack on the response we saw from the redirect into the history
# list that is added on to the final response.
history.append(response)
vcr_response = cassette.play_response(vcr_request)
response = build_response(vcr_request, vcr_response, history)
return response
async def record_response(cassette, vcr_request, response):
"""Record a VCR request-response chain to the cassette."""
try:
body = {"string": (await response.read())}
# aiohttp raises a ClientConnectionError on reads when
# there is no body. We can use this to know to not write one.
except ClientConnectionError:
body = {}
vcr_response = {
"status": {"code": response.status, "message": response.reason},
"headers": _serialize_headers(response.headers),
"body": body,
}
cassette.append(vcr_request, vcr_response)
async def record_responses(cassette, vcr_request, response):
"""Because aiohttp follows redirects by default, we must support
them by default. This method is used to write individual
request-response chains that were implicitly followed to get
to the final destination.
"""
for i, past_response in enumerate(response.history):
aiohttp_request = past_response.request_info
past_request = Request(
aiohttp_request.method,
str(aiohttp_request.url),
# Record body of first request, rest are following a redirect.
None if i else vcr_request.body,
_serialize_headers(aiohttp_request.headers),
)
await record_response(cassette, past_request, past_response)
# If we're following redirects, then the last request-response
# we record is the one attached to the `response`.
if response.history:
aiohttp_request = response.request_info
vcr_request = Request(
aiohttp_request.method,
str(aiohttp_request.url),
None,
_serialize_headers(aiohttp_request.headers),
)
await record_response(cassette, vcr_request, response)
def _build_cookie_header(session, cookies, cookie_header, url):
url, _ = strip_auth_from_url(url)
all_cookies = session._cookie_jar.filter_cookies(url)
if cookies is not None:
tmp_cookie_jar = CookieJar()
tmp_cookie_jar.update_cookies(cookies)
req_cookies = tmp_cookie_jar.filter_cookies(url)
if req_cookies:
all_cookies.load(req_cookies)
if not all_cookies and not cookie_header:
return None
c = SimpleCookie()
if cookie_header:
c.load(cookie_header)
for name, value in all_cookies.items():
if isinstance(value, Morsel):
mrsl_val = value.get(value.key, Morsel())
mrsl_val.set(value.key, value.value, value.coded_value)
c[name] = mrsl_val
else:
c[name] = value
return c.output(header="", sep=";").strip()
def _build_url_with_params(url_str: str, params: Mapping[str, Union[str, int, float]]) -> URL:
# This code is basically a copy&paste of aiohttp.
# https://github.com/aio-libs/aiohttp/blob/master/aiohttp/client_reqrep.py#L225
url = URL(url_str)
q = MultiDict(url.query)
url2 = url.with_query(params)
q.extend(url2.query)
return url.with_query(q)
def vcr_request(cassette, real_request):
@functools.wraps(real_request)
async def new_request(self, method, url, **kwargs):
headers = kwargs.get("headers")
auth = kwargs.get("auth")
headers = self._prepare_headers(headers)
data = kwargs.get("data", kwargs.get("json"))
params = kwargs.get("params")
cookies = kwargs.get("cookies")
if auth is not None:
headers["AUTHORIZATION"] = auth.encode()
request_url = URL(url) if not params else _build_url_with_params(url, params)
c_header = headers.pop(hdrs.COOKIE, None)
cookie_header = _build_cookie_header(self, cookies, c_header, request_url)
if cookie_header:
headers[hdrs.COOKIE] = cookie_header
vcr_request = Request(method, str(request_url), data, _serialize_headers(headers))
if cassette.can_play_response_for(vcr_request):
log.info(f"Playing response for {vcr_request} from cassette")
response = play_responses(cassette, vcr_request, kwargs)
for redirect in response.history:
self._cookie_jar.update_cookies(redirect.cookies, redirect.url)
self._cookie_jar.update_cookies(response.cookies, response.url)
return response
if cassette.write_protected and cassette.filter_request(vcr_request):
raise CannotOverwriteExistingCassetteException(cassette=cassette, failed_request=vcr_request)
log.info("%s not in cassette, sending to real server", vcr_request)
response = await real_request(self, method, url, **kwargs)
await record_responses(cassette, vcr_request, response)
return response
return new_request