Change RequestInfo to be a NamedTuple to improve performances (#9692

)

CHANGES/9692.breaking.rst

@@ -0,0 +1 @@
+Changed ``ClientRequest.request_info`` to be a `NamedTuple` to improve client performance -- by :user:`bdraco`.

aiohttp/client_reqrep.py

@@ -106,8 +106,7 @@ class ContentDisposition:
     filename: Optional[str]
 
 
-@dataclasses.dataclass(frozen=True)
-class RequestInfo:
+class RequestInfo(NamedTuple):
     url: URL
     method: str
     headers: "CIMultiDictProxy[str]"
@@ -330,7 +329,11 @@ def port(self) -> Optional[int]:
     @property
     def request_info(self) -> RequestInfo:
         headers: CIMultiDictProxy[str] = CIMultiDictProxy(self.headers)
-        return RequestInfo(self.url, self.method, headers, self.original_url)
+        # These are created on every request, so we use a NamedTuple
+        # for performance reasons.
+        return tuple.__new__(
+            RequestInfo, (self.url, self.method, headers, self.original_url)
+        )
 
     def update_host(self, url: URL) -> None:
         """Update destination host, port and connection type (ssl)."""

docs/client_reference.rst

@@ -1467,7 +1467,7 @@ Response object
 
    .. attribute:: request_info
 
-       A namedtuple with request URL and headers from :class:`~aiohttp.ClientRequest`
+       A :class:`typing.NamedTuple` with request URL and headers from :class:`~aiohttp.ClientRequest`
        object, :class:`aiohttp.RequestInfo` instance.
 
    .. method:: get_encoding()
@@ -1824,7 +1824,7 @@ Utilities
 
 .. class:: RequestInfo()
 
-   A data class with request URL and headers from :class:`~aiohttp.ClientRequest`
+   A :class:`typing.NamedTuple` with request URL and headers from :class:`~aiohttp.ClientRequest`
    object, available as :attr:`ClientResponse.request_info` attribute.
 
    .. attribute:: url