Fix #3090: Drop reader parameter from request.multipart() (#3091)

CHANGES/3090.removal

@@ -0,0 +1 @@
+Drop ``reader`` parameter from ``request.multipart()``.

aiohttp/web_request.py

@@ -19,8 +19,9 @@
 from multidict import CIMultiDict, CIMultiDictProxy, MultiDict, MultiDictProxy
 from yarl import URL
 
-from . import hdrs, multipart
+from . import hdrs
 from .helpers import DEBUG, ChainMapProxy, HeadersMixin, reify, sentinel
+from .multipart import MultipartReader
 from .streams import EmptyStreamReader, StreamReader
 from .typedefs import JSONDecoder, LooseHeaders, RawHeaders, StrOrURL
 from .web_exceptions import HTTPRequestEntityTooLarge
@@ -548,9 +549,9 @@ async def json(self, *, loads: JSONDecoder=DEFAULT_JSON_DECODER) -> Any:
         body = await self.text()
         return loads(body)
 
-    async def multipart(self, *, reader=multipart.MultipartReader):
+    async def multipart(self) -> MultipartReader:
         """Return async iterator to process BODY as multipart."""
-        return reader(self._headers, self._payload)
+        return MultipartReader(self._headers, self._payload)
 
     async def post(self) -> MultiDictProxy:
         """Return POST parameters."""

docs/web_reference.rst

@@ -411,7 +411,7 @@ and :ref:`aiohttp-web-signals` handlers.
          :meth:`~Request.json` call will return the same value.
 
 
-   .. comethod:: multipart(*, reader=aiohttp.multipart.MultipartReader)
+   .. comethod:: multipart()
 
       Returns :class:`aiohttp.multipart.MultipartReader` which processes
       incoming *multipart* request.
@@ -432,6 +432,10 @@ and :ref:`aiohttp-web-signals` handlers.
 
       .. seealso:: :ref:`aiohttp-multipart`
 
+      .. versionchanged:: 3.4
+
+         Dropped *reader* parameter.
+
    .. comethod:: post()
 
       A :ref:`coroutine <coroutine>` that reads POST parameters from