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package plugin
import (
"fmt"
"log"
"time"
"github.com/coredns/coredns/plugin"
"github.com/gophercloud/gophercloud"
"github.com/gophercloud/gophercloud/openstack"
"github.com/gophercloud/gophercloud/openstack/compute/v2/servers"
"github.com/gophercloud/gophercloud/openstack/identity/v3/projects"
"github.com/gophercloud/gophercloud/pagination"
)
// DNSEntries represents a list of hostname assiociated with a list of IPs
type DNSEntries map[string][]string
type serverEntry struct {
Name string
TenantName string
Addresses []string
}
func extractFloating(addresses map[string]interface{}) []string {
floatings := make([]string, 0)
for _, addrList := range addresses {
t := addrList.([]interface{})
for _, j := range t {
k := j.(map[string]interface{})
if k["OS-EXT-IPS:type"] == "floating" && k["version"].(float64) == 4 {
floatings = append(floatings, k["addr"].(string))
}
}
}
return floatings
}
func (os OpenStack) listTenants(provider *gophercloud.ProviderClient) (map[string]string, error) {
r := make(map[string]string)
client, err := openstack.NewIdentityV3(provider, gophercloud.EndpointOpts{Region: os.Region})
if err != nil {
return nil, fmt.Errorf("Unable to fetch tenants: %s", err)
}
pager := projects.List(client, nil)
err = pager.EachPage(func(page pagination.Page) (bool, error) {
projectsList, _ := projects.ExtractProjects(page)
for _, t := range projectsList {
r[t.ID] = t.Name
}
return true, nil
})
if err != nil {
return nil, fmt.Errorf("Unable to fetch tenants: %s", err)
}
return r, nil
}
func (os OpenStack) listServers(provider *gophercloud.ProviderClient, tenantMapping map[string]string) ([]serverEntry, error) {
serverEntries := make([]serverEntry, 0)
client, err := openstack.NewComputeV2(provider, gophercloud.EndpointOpts{
Region: os.Region,
})
if err != nil {
return nil, fmt.Errorf("Unable to fetch servers: %s", err)
}
opts := servers.ListOpts{AllTenants: true}
pager := servers.List(client, opts)
err = pager.EachPage(func(page pagination.Page) (bool, error) {
serverList, _ := servers.ExtractServers(page)
for _, s := range serverList {
se := serverEntry{
Name: s.Name,
TenantName: tenantMapping[s.TenantID],
Addresses: extractFloating(s.Addresses),
}
serverEntries = append(serverEntries, se)
}
return true, nil
})
if err != nil {
return nil, fmt.Errorf("Unable to list servers: %s", err)
}
return serverEntries, nil
}
func (os OpenStack) fetchEntries() (DNSEntries, error) {
provider, err := openstack.AuthenticatedClient(*os.AuthOptions)
if err != nil {
return nil, fmt.Errorf("Unable to authenticate: %s", err)
}
entries := make(DNSEntries)
mapping, err := os.listTenants(provider)
if err != nil {
return nil, err
}
servers, err := os.listServers(provider, mapping)
if err != nil {
return nil, err
}
for _, srv := range servers {
name := srv.Name + "." + srv.TenantName
entries[name] = srv.Addresses
}
return entries, nil
}
func (os OpenStack) runFetchEntries(globalEntries *DNSEntries) {
var err error
var entriesTemp DNSEntries
for {
entriesTemp, err = os.fetchEntries()
if err == nil {
*globalEntries = entriesTemp
} else {
log.Println(plugin.Error("openstack", err))
}
time.Sleep(time.Second)
}
}