private String getUniqueIdFromInvokeContext() {
        String uniqueId = (String) RpcInvokeContext.getContext().get(TripleContants.SOFA_UNIQUE_ID);
        return uniqueId == null ? "" : uniqueId;
    }
get unique id from rpc invoke context

@return unique id from rpc invoke context
remoting/remoting-triple/src/main/java/com/alipay/sofa/rpc/server/triple/UniqueIdInvoker.java