How to perform srvctl functions programmatically?

Hi all,

I know there is api for crsctl. But what if all I need is to inquire about RAC databases, nodes, instances and vips?

What api can I use to do the same things that I can do from command line with srvctl?

I know I can spawn srvctl processes and then parse the output, but that option doesn't seem very clean and dependent on a lot of factors that can change.

thanks in advance for any help

Ed