langchain/vectorstores/milvus.py/Milvus/_create_connection_alias
class Milvus:    def _create_connection_alias(self, connection_args: dict) -> str:
        """Create the connection to the Milvus server."""
        from pymilvus import MilvusException, connections

        # Grab the connection arguments that are used for checking existing connection
        host: str = connection_args.get("host", None)
        port: Union[str, int] = connection_args.get("port", None)
        address: str = connection_args.get("address", None)
        uri: str = connection_args.get("uri", None)
        user = connection_args.get("user", None)

        # Order of use is host/port, uri, address
        if host is not None and port is not None:
            given_address = str(host) + ":" + str(port)
        elif uri is not None:
            given_address = uri.split("https://")[1]
        elif address is not None:
            given_address = address
        else:
            given_address = None
            logger.debug("Missing standard address type for reuse atttempt")

        # User defaults to empty string when getting connection info
        if user is not None:
            tmp_user = user
        else:
            tmp_user = ""

        # If a valid address was given, then check if a connection exists
        if given_address is not None:
            for con in connections.list_connections():
                addr = connections.get_connection_addr(con[0])
                if (
                    con[1]
                    and ("address" in addr)
                    and (addr["address"] == given_address)
                    and ("user" in addr)
                    and (addr["user"] == tmp_user)
                ):
                    logger.debug("Using previous connection: %s", con[0])
                    return con[0]

        # Generate a new connection if one doesnt exist
        alias = uuid4().hex
        try:
            connections.connect(alias=alias, **connection_args)
            logger.debug("Created new connection using: %s", alias)
            return alias
        except MilvusException as e:
            logger.error("Failed to create new connection using: %s", alias)
            raise e