Just released Cacti Mirage plugin dumps poller data to file for easy ingestion into any downstream system, like Splunk. Plus, a Cacti app coming soon to Splunk.
Check it out:
http://blogs.splunk.com/2016/01/29/splunk-and-cacti/
You could take a look at the Scripted Input for RRD database or MKAdvantage Cacti Portal apps.