I try to add methodes to net.IP. Therefore I created a custom type IPAddr:
package main
import (
"encoding/json"
"net"
"log"
)
func readNetworks(data []byte) (*[]Network, error) {
var networks []Network
if err := json.Unmarshal(data, &networks); err != nil {
return &networks, err
}
return &networks, nil
}
type IPAddr net.IP
type Network struct {
CIDR string `json:"cidr"`
Gateway IPAddr `json:"gateway"`
}
func (ip *IPAddr) copy() IPAddr {
if x := ip.To4(); x != nil {
ip = x
}
dup := make(IPAddr, len(ip))
copy(dup, ip)
return dup
}
func main() {
_, err := readNetworks([]byte("[{\"cidr\":\"10.100.19.0/24\",\"gateway\":\"10.100.19.1\"}]"))
if err != nil {
log.Fatal(err)
}
}
Some things that do not work here:
- Method To4() from net.IP is not known for IPAddr (line 27)
- len() does not work for IPAddr but for net.IP (line 30)
- string cannot be unmarshalled to IPAddr, this works for net.IP (line 12)
My type definition is obviously wrong... any hints?
See example at: http://play.golang.org/p/BT7VFnbPZW