pool.py 文件源码

def command(self, dbname, spec, slave_ok=False,
                read_preference=ReadPreference.PRIMARY,
                codec_options=DEFAULT_CODEC_OPTIONS, check=True,
                allowable_errors=None, check_keys=False,
                read_concern=DEFAULT_READ_CONCERN):
        """Execute a command or raise ConnectionFailure or OperationFailure.

        :Parameters:
          - `dbname`: name of the database on which to run the command
          - `spec`: a command document as a dict, SON, or mapping object
          - `slave_ok`: whether to set the SlaveOkay wire protocol bit
          - `read_preference`: a read preference
          - `codec_options`: a CodecOptions instance
          - `check`: raise OperationFailure if there are errors
          - `allowable_errors`: errors to ignore if `check` is True
          - `check_keys`: if True, check `spec` for invalid keys
          - `read_concern`: The read concern for this command.
        """
        if self.max_wire_version < 4 and not read_concern.ok_for_legacy:
            raise ConfigurationError(
                'read concern level of %s is not valid '
                'with a max wire version of %d.'
                % (read_concern.level, self.max_wire_version))
        try:
            return command(self.sock, dbname, spec, slave_ok,
                           self.is_mongos, read_preference, codec_options,
                           check, allowable_errors, self.address,
                           check_keys, self.listeners, self.max_bson_size,
                           read_concern)
        except OperationFailure:
            raise
        # Catch socket.error, KeyboardInterrupt, etc. and close ourselves.
        except BaseException as error:
            self._raise_connection_failure(error)