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vlangroup.go
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vlangroup.go
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package lochness
import (
"encoding/json"
"errors"
"path/filepath"
"strconv"
"github.com/pborman/uuid"
"github.com/coreos/go-etcd/etcd"
)
var (
// VLANGroupPath is the path in the config store for VLAN groups
VLANGroupPath = "/lochness/vlangroups/"
)
type (
// VLANGroup defines a set of VLANs for a guest interface
VLANGroup struct {
context *Context
modifiedIndex uint64
ID string `json:"id"`
Description string `json:"description"`
Metadata map[string]string `json:"metadata"`
vlans []int
}
// VLANGroups is an alias to a slice of *VLANGroup
VLANGroups []*VLANGroup
)
func (c *Context) blankVLANGroup(id string) *VLANGroup {
vg := &VLANGroup{
context: c,
ID: id,
Metadata: make(map[string]string),
vlans: make([]int, 0, 0),
}
if id == "" {
vg.ID = uuid.New()
}
return vg
}
// key is a helper to generate the config store key.
func (vg *VLANGroup) key() string {
return filepath.Join(VLANGroupPath, vg.ID, "metadata")
}
func (vg *VLANGroup) vlanKey(vlan *VLAN) string {
var key int
if vlan != nil {
key = vlan.Tag
}
return filepath.Join(VLANGroupPath, vg.ID, "vlans", strconv.Itoa(key))
}
// NewVLANGroup creates a new blank VLANGroup.
func (c *Context) NewVLANGroup() *VLANGroup {
return c.blankVLANGroup("")
}
// VLANGroup fetches a VLAN from the data store.
func (c *Context) VLANGroup(id string) (*VLANGroup, error) {
var err error
id, err = canonicalizeUUID(id)
if err != nil {
return nil, err
}
vg := c.blankVLANGroup(id)
if err = vg.Refresh(); err != nil {
return nil, err
}
return vg, nil
}
// Refresh reloads the VLAN from the data store.
func (vg *VLANGroup) Refresh() error {
resp, err := vg.context.etcd.Get(filepath.Dir(vg.key()), false, true)
if err != nil {
return err
}
for _, node := range resp.Node.Nodes {
key := filepath.Base(node.Key)
switch key {
case "metadata":
if err := json.Unmarshal([]byte(node.Value), &vg); err != nil {
return err
}
vg.modifiedIndex = node.ModifiedIndex
case "vlans":
for _, x := range node.Nodes {
vlanTag, _ := strconv.Atoi(filepath.Base(x.Key))
vg.vlans = append(vg.vlans, vlanTag)
}
}
}
return nil
}
// Validate ensures a VLANGroup has resonable data.
func (vg *VLANGroup) Validate() error {
if _, err := canonicalizeUUID(vg.ID); err != nil {
return errors.New("invalid ID")
}
return nil
}
// Save persists a VLANgroup. It will call Validate.
func (vg *VLANGroup) Save() error {
if err := vg.Validate(); err != nil {
return err
}
value, err := json.Marshal(vg)
if err != nil {
return err
}
// if something changed, don't clobber
var resp *etcd.Response
if vg.modifiedIndex != 0 {
resp, err = vg.context.etcd.CompareAndSwap(vg.key(), string(value), 0, "", vg.modifiedIndex)
} else {
resp, err = vg.context.etcd.Create(vg.key(), string(value), 0)
}
if err != nil {
return err
}
vg.modifiedIndex = resp.EtcdIndex
return nil
}
// Destroy removes a VLANGroup
func (vg *VLANGroup) Destroy() error {
// Unlink VLANs
for _, vlanTag := range vg.vlans {
vlan, err := vg.context.VLAN(vlanTag)
if err != nil {
return err
}
if err := vg.RemoveVLAN(vlan); err != nil {
return err
}
}
// Delete the VLANGroup
if _, err := vg.context.etcd.Delete(filepath.Dir(vg.key()), true); err != nil {
return err
}
return nil
}
// AddVLAN adds a VLAN to the VLANGroup
func (vg *VLANGroup) AddVLAN(vlan *VLAN) error {
// VLANGroup side
if _, err := vg.context.etcd.Set(vg.vlanKey(vlan), "", 0); err != nil {
return err
}
vg.vlans = append(vg.vlans, vlan.Tag)
// VLAN side
if _, err := vlan.context.etcd.Set(vlan.vlanGroupKey(vg), "", 0); err != nil {
return err
}
vlan.vlanGroups = append(vlan.vlanGroups, vg.ID)
return nil
}
// RemoveVLAN removes a VLAN from the VLANGroup
func (vg *VLANGroup) RemoveVLAN(vlan *VLAN) error {
// VLANGroup side
if _, err := vg.context.etcd.Delete(vg.vlanKey(vlan), false); err != nil {
return err
}
newVLANs := make([]int, 0, len(vg.vlans)-1)
for _, vlanTag := range vg.vlans {
if vlanTag != vlan.Tag {
newVLANs = append(newVLANs, vlanTag)
}
}
vg.vlans = newVLANs
// VLAN side
if _, err := vlan.context.etcd.Delete(vlan.vlanGroupKey(vg), false); err != nil {
return err
}
newVLANGroups := make([]string, 0, len(vlan.vlanGroups)-1)
for _, vlanGroup := range vlan.vlanGroups {
if vlanGroup != vg.ID {
newVLANGroups = append(newVLANGroups, vlanGroup)
}
}
vlan.vlanGroups = newVLANGroups
return nil
}
// ForEachVLANGroup will run f on each VLAN. It will stop iteration if f returns an error.
func (c *Context) ForEachVLANGroup(f func(*VLANGroup) error) error {
resp, err := c.etcd.Get(VLANGroupPath, false, false)
if err != nil {
return err
}
for _, n := range resp.Node.Nodes {
groupID := filepath.Base(n.Key)
vlanGroup, err := c.VLANGroup(groupID)
if err != nil {
return err
}
if err := f(vlanGroup); err != nil {
return err
}
}
return nil
}
// VLANs returns the Tags of the VLANs associated with the VLANGroup
func (vg *VLANGroup) VLANs() []int {
return vg.vlans
}