gophercloud: extracting addresses of servers

gophercloud-server-addresses.go

package main

import (
	"fmt"
	"log"

	"github.com/gophercloud/gophercloud"
	"github.com/gophercloud/gophercloud/openstack"
	"github.com/gophercloud/gophercloud/openstack/compute/v2/servers"
	"github.com/gophercloud/utils/openstack/clientconfig"
)

func main() {
	fmt.Println("extract addresses of all servers")

	provider, err := clientconfig.AuthenticatedClient(&clientconfig.ClientOpts{})
	if err != nil {
		log.Fatal(err)
	}

	vms, err := openstack.NewComputeV2(provider, gophercloud.EndpointOpts{})
	if err != nil {
		log.Fatal(err)
	}

	all, err := servers.List(vms, servers.ListOpts{}).AllPages()
	if err != nil {
		log.Fatal(err)
	}

	allServers, err := servers.ExtractServers(all)
	if err != nil {
		log.Fatal(err)
	}

	addrs := make([]string, 0)
	for _, s := range allServers {
		for k, _ := range s.Addresses {
			v, ok := s.Addresses[k].([]interface{})
			if !ok {
				log.Printf("skipping %+v", v)
				continue
			}
			for _, a := range v {
				at, ok := a.(map[string]interface{})
				if !ok {
					log.Printf("skipping %+v", a)
					continue
				}
				addr, ok := at["addr"]
				if !ok {
					log.Printf("skipping %+v", at)
					continue
				}

				realAddr, ok := addr.(string)
				if !ok {
					log.Printf("skipping %+v", addr)
					continue
				}
				addrs = append(addrs, realAddr)
			}
		}
	}
	fmt.Printf("%#v\n", addrs)
}