Fix missing eof when writer cancelled

CHANGES/7764.bugfix

@@ -0,0 +1 @@
+Fixed an issue when a client request is closed before completing a chunked payload -- by :user:`Dreamsorcerer`

aiohttp/client.py

@@ -1140,6 +1140,7 @@ async def __aexit__(
         # explicitly.  Otherwise connection error handling should kick in
         # and close/recycle the connection as required.
         self._resp.release()
+        await self._resp.wait_for_close()
 
 
 class _WSRequestContextManager(_BaseRequestContextManager[ClientWebSocketResponse]):

aiohttp/client_reqrep.py

@@ -529,8 +529,11 @@ async def write_bytes(
         """Support coroutines that yields bytes objects."""
         # 100 response
         if self._continue is not None:
-            await writer.drain()
-            await self._continue
+            try:
+                await writer.drain()
+                await self._continue
+            except asyncio.CancelledError:
+                return
 
         protocol = conn.protocol
         assert protocol is not None
@@ -543,8 +546,6 @@ async def write_bytes(
 
                 for chunk in self.body:
                     await writer.write(chunk)  # type: ignore[arg-type]
-
-            await writer.write_eof()
         except OSError as exc:
             if exc.errno is None and isinstance(exc, asyncio.TimeoutError):
                 protocol.set_exception(exc)
@@ -555,12 +556,12 @@ async def write_bytes(
                 new_exc.__context__ = exc
                 new_exc.__cause__ = exc
                 protocol.set_exception(new_exc)
-        except asyncio.CancelledError as exc:
-            if not conn.closed:
-                protocol.set_exception(exc)
+        except asyncio.CancelledError:
+            await writer.write_eof()
         except Exception as exc:
             protocol.set_exception(exc)
         else:
+            await writer.write_eof()
             protocol.start_timeout()
         finally:
             self._writer = None
@@ -649,7 +650,8 @@ async def send(self, conn: "Connection") -> "ClientResponse":
     async def close(self) -> None:
         if self._writer is not None:
             try:
-                await self._writer
+                with contextlib.suppress(asyncio.CancelledError):
+                    await self._writer
             finally:
                 self._writer = None
 
@@ -914,8 +916,7 @@ def _response_eof(self) -> None:
             ):
                 return
 
-            self._connection.release()
-            self._connection = None
+            self._release_connection()
 
         self._closed = True
         self._cleanup_writer()
@@ -927,30 +928,22 @@ def closed(self) -> bool:
     def close(self) -> None:
         if not self._released:
             self._notify_content()
-        if self._closed:
-            return
 
         self._closed = True
         if self._loop.is_closed():
             return
 
-        if self._connection is not None:
-            self._connection.close()
-            self._connection = None
         self._cleanup_writer()
+        self._release_connection()
 
     def release(self) -> Any:
         if not self._released:
             self._notify_content()
-        if self._closed:
-            return noop()
 
         self._closed = True
-        if self._connection is not None:
-            self._connection.release()
-            self._connection = None
 
         self._cleanup_writer()
+        self._release_connection()
         return noop()
 
     @property
@@ -975,10 +968,28 @@ def raise_for_status(self) -> None:
                 headers=self.headers,
             )
 
+    def _release_connection(self) -> None:
+        if self._connection is not None:
+            if self._writer is None:
+                self._connection.release()
+                self._connection = None
+            else:
+                self._writer.add_done_callback(lambda f: self._release_connection())
+
+    async def _wait_released(self) -> None:
+        if self._writer is not None:
+            try:
+                await self._writer
+            finally:
+                self._writer = None
+        self._release_connection()
+
     def _cleanup_writer(self) -> None:
         if self._writer is not None:
-            self._writer.cancel()
-        self._writer = None
+            if self._writer.done():
+                self._writer = None
+            else:
+                self._writer.cancel()
         self._session = None
 
     def _notify_content(self) -> None:
@@ -1008,9 +1019,10 @@ async def read(self) -> bytes:
             except BaseException:
                 self.close()
                 raise
-        elif self._released:
+        elif self._released:  # Response explicity released
             raise ClientConnectionError("Connection closed")
 
+        await self._wait_released()  # Underlying connection released
         return self._body
 
     def get_encoding(self) -> str:
@@ -1087,3 +1099,4 @@ async def __aexit__(
         # for exceptions, response object can close connection
         # if state is broken
         self.release()
+        await self.wait_for_close()

tests/test_client_functional.py

@@ -137,6 +137,7 @@ async def handler(request):
     client = await aiohttp_client(app)
     resp = await client.get("/")
     assert resp.closed
+    await resp.wait_for_close()
     assert 1 == len(client._session.connector._conns)
 
 
@@ -156,6 +157,60 @@ async def handler(request):
     assert content == b""
 
 
+async def test_stream_request_on_server_eof(aiohttp_client) -> None:
+    async def handler(request):
+        return web.Response(text="OK", status=200)
+
+    app = web.Application()
+    app.add_routes([web.get("/", handler)])
+    app.add_routes([web.put("/", handler)])
+
+    client = await aiohttp_client(app)
+
+    async def data_gen():
+        for _ in range(2):
+            yield b"just data"
+            await asyncio.sleep(0.1)
+
+    async with client.put("/", data=data_gen()) as resp:
+        assert 200 == resp.status
+        assert len(client.session.connector._acquired) == 1
+        conn = next(iter(client.session.connector._acquired))
+
+    async with client.get("/") as resp:
+        assert 200 == resp.status
+
+    # Connection should have been reused
+    conns = next(iter(client.session.connector._conns.values()))
+    assert len(conns) == 1
+    assert conns[0][0] is conn
+
+
+async def test_stream_request_on_server_eof_nested(aiohttp_client) -> None:
+    async def handler(request):
+        return web.Response(text="OK", status=200)
+
+    app = web.Application()
+    app.add_routes([web.get("/", handler)])
+    app.add_routes([web.put("/", handler)])
+
+    client = await aiohttp_client(app)
+
+    async def data_gen():
+        for _ in range(2):
+            yield b"just data"
+            await asyncio.sleep(0.1)
+
+    async with client.put("/", data=data_gen()) as resp:
+        assert 200 == resp.status
+        async with client.get("/") as resp:
+            assert 200 == resp.status
+
+    # Should be 2 separate connections
+    conns = next(iter(client.session.connector._conns.values()))
+    assert len(conns) == 2
+
+
 async def test_HTTP_304_WITH_BODY(aiohttp_client: Any) -> None:
     async def handler(request):
         body = await request.read()
@@ -238,8 +293,8 @@ async def handler(request):
     client = await aiohttp_client(app)
 
     with io.BytesIO(data) as file_handle:
-        resp = await client.post("/", data=file_handle)
-    assert 200 == resp.status
+        async with client.post("/", data=file_handle) as resp:
+            assert 200 == resp.status
 
 
 async def test_post_data_with_bytesio_file(aiohttp_client: Any) -> None: