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/*
* Copyright (C) 2017-2018 "IoT.bzh"
* Author Sebastien Douheret <sebastien@iot.bzh>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package xdsconfig
import (
"encoding/xml"
"fmt"
"os"
"path/filepath"
common "gerrit.automotivelinux.org/gerrit/src/xds/xds-common.git/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"`
}
// ServerData Hold server data saved in ServerData file
type ServerData struct {
ID string `xml:"id"`
}
var sdMutex = sync.NewMutex()
// ServerIDGet Get Server unique ID
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()
dir := filepath.Dir(file)
if !common.Exists(dir) {
if err := os.MkdirAll(dir, 0755); err != nil {
return fmt.Errorf("Cannot create server data directory: %s", dir)
}
}
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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