From: Alexander Maryanovsky <msasha@gmail.com>
Date: Mon, 12 Apr 2021 16:37:02 +0000 (+0300)
Subject: Type-hint stream_request_body so that the type of stream_request_body(cls) is the... 
X-Git-Tag: v6.2.0b1~22^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0cf7a2a89688ef7910f6962e81f8323dfe6cf422;p=thirdparty%2Ftornado.git

Type-hint stream_request_body so that the type of stream_request_body(cls) is the same as the type of cls.
---

diff --git a/tornado/web.py b/tornado/web.py
index ddf1de746..06e37c281 100644
--- a/tornado/web.py
+++ b/tornado/web.py
@@ -118,6 +118,7 @@ from typing import (
     Iterable,
     Generator,
     Type,
+    TypeVar,
     cast,
     overload,
 )
@@ -1818,7 +1819,10 @@ class RequestHandler(object):
             self.clear_header(h)
 
 
-def stream_request_body(cls: Type[RequestHandler]) -> Type[RequestHandler]:
+RequestHandlerType = TypeVar("RequestHandlerType", bound=RequestHandler)
+
+
+def stream_request_body(cls: Type[RequestHandlerType]) -> Type[RequestHandlerType]:
     """Apply to `RequestHandler` subclasses to enable streaming body support.
 
     This decorator implies the following changes: