This is go-conntrack and it is written in golang. It provides a C-binding free API to the conntrack subsystem of the Linux kernel.
package main
import (
	"fmt"
	"github.com/florianl/go-conntrack"
)
func main() {
	nfct, err := conntrack.Open(&conntrack.Config{})
	if err != nil {
		fmt.Println("could not create nfct:", err)
		return
	}
	defer nfct.Close()
	// Get all IPv4 entries of the expected table.
	sessions, err := nfct.Dump(conntrack.Expected, conntrack.IPv4)
	if err != nil {
		fmt.Println("could not dump sessions:", err)
		return
	}
	// Print out all expected sessions.
	for _, session := range sessions {
		fmt.Printf("%#v\n", session)
	}
}- A version of Go that is supported by upstream