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package xdsconfig
import (
"encoding/xml"
"fmt"
"os"
common "github.com/iotbzh/xds-common/golib"
uuid "github.com/satori/go.uuid"
"github.com/syncthing/syncthing/lib/sync"
)
// xmlServerData contains persistent data stored/loaded by server
type xmlServerData struct {
XMLName xml.Name `xml:"XDS-Server"`
Version string `xml:"version,attr"`
Data ServerData `xml:"server-data"`
}
type ServerData struct {
ID string `xml:"id"`
}
var sdMutex = sync.NewMutex()
// ServerIDGet
func ServerIDGet() (string, error) {
var f string
var err error
d := ServerData{}
if f, err = ServerDataFilenameGet(); err != nil {
return "", err
}
if err = serverDataRead(f, &d); err != nil || d.ID == "" {
// Create a new uuid when not found
d.ID = uuid.NewV1().String()
if err := serverDataWrite(f, d); err != nil {
return "", err
}
}
return d.ID, nil
}
// serverDataRead reads data saved on disk
func serverDataRead(file string, data *ServerData) error {
if !common.Exists(file) {
return fmt.Errorf("No folder config file found (%s)", file)
}
sdMutex.Lock()
defer sdMutex.Unlock()
fd, err := os.Open(file)
defer fd.Close()
if err != nil {
return err
}
xsd := xmlServerData{}
err = xml.NewDecoder(fd).Decode(&xsd)
if err == nil {
*data = xsd.Data
}
return err
}
// serverDataWrite writes persistant data to disk
func serverDataWrite(file string, data ServerData) error {
sdMutex.Lock()
defer sdMutex.Unlock()
fd, err := os.OpenFile(file, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0666)
defer fd.Close()
if err != nil {
return err
}
xsd := &xmlServerData{
Version: "1",
Data: data,
}
enc := xml.NewEncoder(fd)
enc.Indent("", " ")
return enc.Encode(xsd)
}
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