def _command(self, sock_info, command, slave_ok=False,
read_preference=None,
codec_options=None, check=True, allowable_errors=None,
read_concern=DEFAULT_READ_CONCERN):
"""Internal command helper.
:Parameters:
- `sock_info` - A SocketInfo instance.
- `command` - The command itself, as a SON instance.
- `slave_ok`: whether to set the SlaveOkay wire protocol bit.
- `codec_options` (optional) - An instance of
:class:`~bson.codec_options.CodecOptions`.
- `check`: raise OperationFailure if there are errors
- `allowable_errors`: errors to ignore if `check` is True
- `read_concern` (optional) - An instance of
:class:`~pymongo.read_concern.ReadConcern`.
:Returns:
# todo: don't return address
(result document, address of server the command was run on)
"""
return sock_info.command(self.__database.name,
command,
slave_ok,
read_preference or self.read_preference,
codec_options or self.codec_options,
check,
allowable_errors,
read_concern=read_concern)
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