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vxlan.go
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vxlan.go
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/*
Copyright 2018 ZTE Corporation. All rights reserved.
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 networkserver
import (
"encoding/json"
"errors"
"github.com/ZTE/Knitter/pkg/db-accessor"
LOG "github.com/ZTE/Knitter/pkg/klog"
"strconv"
"sync"
)
const (
StartVxlanID int = 5000
EndVxlanID int = 15000
ErrVxlanID int = 88888
)
type VxlanIDManager struct {
lock sync.Mutex
IDList map[string]*bool
}
var vxlanManager *VxlanIDManager
func GetVxlanManager() *VxlanIDManager {
if vxlanManager == nil {
vxlan := VxlanIDManager{}
vxlan.load()
vxlanManager = &vxlan
}
return vxlanManager
}
func (_ *VxlanIDManager) GetErrVxlanID() string {
return strconv.Itoa(ErrVxlanID)
}
func (self *VxlanIDManager) Alloc() (string, error) {
self.lock.Lock()
defer self.lock.Unlock()
if self.IDList == nil {
self.IDList = make(map[string]*bool)
}
for i := StartVxlanID; i < EndVxlanID; i++ {
id := strconv.Itoa(i)
if self.IDList[id] == nil {
used := true
self.IDList[id] = &used
err := self.save()
if err != nil {
delete(self.IDList, id)
continue
}
return id, nil
}
}
return strconv.Itoa(ErrVxlanID), errors.New("can-not-alloc-vxlan-id")
}
func (self *VxlanIDManager) Free(id string) error {
self.lock.Lock()
defer self.lock.Unlock()
if self.IDList[id] == nil {
return errors.New("free-vxlan-id-error:not-in-use")
}
idItem := self.IDList[id]
delete(self.IDList, id)
err := self.save()
if err != nil {
self.IDList[id] = idItem
return err
}
return nil
}
func (self *VxlanIDManager) load() (err error) {
self.lock.Lock()
defer self.lock.Unlock()
key := dbaccessor.GetKeyOfEmbeddedServerVnis()
value, err := ReadData(key)
if err != nil {
LOG.Error("Read-embedded-server-data-from-etcd-error")
return err
}
return json.Unmarshal([]byte(value), &self)
}
func (self *VxlanIDManager) save() (err error) {
key := dbaccessor.GetKeyOfEmbeddedServerVnis()
value, err := json.Marshal(self)
if err != nil {
LOG.Error("Marshal-ERROR:", err.Error())
return err
}
err = SaveData(key, string(value))
if err != nil {
LOG.Error("Save-embedded-server-VxlanIDManager-data-to-etcd-error")
return err
}
return nil
}