don't wait for disconnect() when handling errors (pr redis#2356)

This can result in other errors such as timeouts.

redis/asyncio/connection.py

@@ -826,7 +826,7 @@ async def on_connect(self) -> None:
  if str_if_bytes(await self.read_response()) != "OK":
  raise ConnectionError("Invalid Database")
 
- async def disconnect(self) -> None:
+ async def disconnect(self, nowait: bool = False) -> None:
  """Disconnects from the Redis server"""
  try:
  async with async_timeout.timeout(self.socket_connect_timeout):
@@ -836,8 +836,9 @@ async def disconnect(self) -> None:
  try:
  if os.getpid() == self.pid:
  self._writer.close() # type: ignore[union-attr]
- # py3.6 doesn't have this method
- if hasattr(self._writer, "wait_closed"):
+ # wait for close to finish, except when handling errors and
+ # forcecully disconnecting.
+ if not nowait:
  await self._writer.wait_closed() # type: ignore[union-attr]
  except OSError:
  pass
@@ -938,10 +939,10 @@ async def read_response(self, disable_decoding: bool = False):
  disable_decoding=disable_decoding
  )
  except asyncio.TimeoutError:
- await self.disconnect()
+ await self.disconnect(nowait=True)
  raise TimeoutError(f"Timeout reading from {self.host}:{self.port}")
  except OSError as e:
- await self.disconnect()
+ await self.disconnect(nowait=True)
  raise ConnectionError(
  f"Error while reading from {self.host}:{self.port} : {e.args}"
  )
@@ -950,7 +951,7 @@ async def read_response(self, disable_decoding: bool = False):
  # is subclass of Exception, not BaseException
  raise
  except Exception:
- await self.disconnect()
+ await self.disconnect(nowait=True)
  raise
 
  if self.health_check_interval: