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etcd.go
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etcd.go
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package metaserver
import (
"context"
"encoding/json"
"fmt"
"path/filepath"
"strings"
"time"
"github.com/rfeverything/rfs/internal/logger"
vpb "github.com/rfeverything/rfs/internal/proto/volume_server"
"go.etcd.io/etcd/api/v3/mvccpb"
clientv3 "go.etcd.io/etcd/client/v3"
"go.etcd.io/etcd/client/v3/concurrency"
"go.uber.org/zap"
)
type EtcdStore struct {
uniqueID int32
client *clientv3.Client
isleader bool
closed bool
volumeUpdateChan chan *VolumeUpdateEvent
}
func genKey(dir, FileName string) (key string) {
dir = strings.TrimPrefix(dir, "/")
return strings.Join([]string{"file", dir, FileName}, "/")
}
func NewEtcdStore(UniqueID int32) *EtcdStore {
logger.Global().Info("NewEtcdStore", zap.Int32("uid", UniqueID))
var client *clientv3.Client
var err error
config := clientv3.Config{
Endpoints: []string{"127.0.0.1:2379"},
DialTimeout: 5 * time.Second,
}
if client, err = clientv3.New(config); err != nil {
logger.Global().Fatal(err.Error())
}
resp, err := client.Grant(context.TODO(), 5)
if err != nil {
logger.Global().Fatal(err.Error())
}
_, err = client.Put(context.TODO(), strings.Join([]string{"/rfs/meta/", string(UniqueID)}, ""), "", clientv3.WithLease(resp.ID))
if err != nil {
logger.Global().Fatal(err.Error())
}
klresp, kaerr := client.KeepAlive(context.TODO(), resp.ID)
if kaerr != nil {
logger.Global().Fatal(err.Error())
}
//clean lease keepalive response queue
go func() {
for {
<-klresp
}
}()
es := &EtcdStore{
client: client,
uniqueID: UniqueID,
}
es.volumeUpdateChan = make(chan *VolumeUpdateEvent, 1)
go es.election()
go es.watchVolume()
logger.Global().Info("NewEtcdStore Done", zap.Int32("UniqueID", UniqueID))
return es
}
func (es *EtcdStore) Close() {
es.closed = false
es.client.Close()
}
func (es *EtcdStore) InsertEntry(ctx context.Context, dir string, entry *Entry) error {
key := genKey(dir, entry.Name)
meta, err := entry.EncodeAttributesAndChunks()
if err != nil {
return fmt.Errorf("EncodeAttributesAndChunks: %v", err)
}
if _, err := es.client.Put(ctx, string(key), string(meta)); err != nil {
return fmt.Errorf("EtcdStore.Put: %v", err)
}
return nil
}
func (es *EtcdStore) GetEntry(ctx context.Context, path string) (*Entry, error) {
key := genKey(filepath.Split(path))
resp, err := es.client.Get(ctx, string(key))
if err != nil {
return nil, fmt.Errorf("EtcdStore.Get: %v", err)
}
if len(resp.Kvs) == 0 {
return nil, nil
}
var entry Entry
if err := entry.DecodeAttributesAndChunks(resp.Kvs[0].Value); err != nil {
return nil, fmt.Errorf("DecodeAttributesAndChunks: %v", err)
}
return &entry, nil
}
func (es *EtcdStore) DeleteEntry(ctx context.Context, path string) error {
key := genKey(filepath.Split(path))
if _, err := es.client.Delete(ctx, string(key)); err != nil {
return fmt.Errorf("EtcdStore.Delete: %v", err)
}
return nil
}
func (es *EtcdStore) ListEntries(ctx context.Context, dir string) ([]*Entry, error) {
key := genKey(dir, "")
resp, err := es.client.Get(ctx, key, clientv3.WithPrefix())
if err != nil {
return nil, fmt.Errorf("EtcdStore.Get: %v", err)
}
var entries []*Entry
for _, kv := range resp.Kvs {
var entry Entry
if err := entry.DecodeAttributesAndChunks(kv.Value); err != nil {
continue
}
entries = append(entries, &entry)
}
return entries, nil
}
func (es *EtcdStore) KvGet(ctx context.Context, key string) (string, error) {
resp, err := es.client.Get(ctx, key)
if err != nil {
return "", fmt.Errorf("EtcdStore.Get: %v", err)
}
if len(resp.Kvs) == 0 {
return "", nil
}
return string(resp.Kvs[0].Value), nil
}
func (es *EtcdStore) KvPut(ctx context.Context, key, value string) error {
if _, err := es.client.Put(ctx, key, value); err != nil {
return fmt.Errorf("EtcdStore.Put: %v", err)
}
return nil
}
func (es *EtcdStore) IsLeader() bool {
return es.isleader
}
func (es *EtcdStore) election() {
logger.Global().Info("election")
for !es.closed {
s, err := concurrency.NewSession(es.client, concurrency.WithTTL(5))
if err != nil {
fmt.Println(err)
continue
}
e := concurrency.NewElection(s, "metaserver-leader")
ctx := context.TODO()
if err = e.Campaign(ctx, string(es.uniqueID)); err != nil {
fmt.Println(err)
continue
}
logger.Global().Info("election: success", zap.Int32("uid", es.uniqueID))
es.isleader = true
select {
case <-s.Done():
es.isleader = false
logger.Global().Debug("election: expired", zap.Int32("uid", es.uniqueID))
default:
logger.Global().Debug("election: running", zap.Int32("uid", es.uniqueID))
time.Sleep(time.Second)
}
}
}
func (es *EtcdStore) GetVolumesStatus() ([]*vpb.VolumeStatus, error) {
resp, err := es.client.Get(context.TODO(), "/rfs/volumes/", clientv3.WithPrefix())
if err != nil {
return nil, fmt.Errorf("EtcdStore.Get: %v", err)
}
var volumes []*vpb.VolumeStatus
for _, kv := range resp.Kvs {
var volume vpb.VolumeStatus
if err := json.Unmarshal(kv.Value, &volume); err != nil {
return nil, fmt.Errorf("json.Unmarshal: %v", err)
}
volumes = append(volumes, &volume)
}
return volumes, nil
}
func (es *EtcdStore) GetVolumesStatusChan() chan *VolumeUpdateEvent {
return es.volumeUpdateChan
}
func (es *EtcdStore) watchVolume() {
ctx := context.TODO()
rch := es.client.Watch(ctx, "/rfs/volumes/", clientv3.WithPrefix())
for wresp := range rch {
for _, ev := range wresp.Events {
switch ev.Type {
case mvccpb.PUT:
var volume vpb.VolumeStatus
if err := json.Unmarshal(ev.Kv.Value, &volume); err != nil {
logger.Global().Error("json.Unmarshal", zap.Error(err))
continue
}
logger.Global().Info("watchVolume: PUT", zap.String("key", string(ev.Kv.Key)), zap.Any("volume", &volume))
es.volumeUpdateChan <- &VolumeUpdateEvent{
Type: VolumeEventTypePut,
Status: &volume,
VolumeId: string(ev.Kv.Key[len("/rfs/volumes/") : len(ev.Kv.Key)-1]),
}
case mvccpb.DELETE:
logger.Global().Info("watchVolume: DELETE", zap.String("key", string(ev.Kv.Key)))
es.volumeUpdateChan <- &VolumeUpdateEvent{
Type: VolumeEventTypeDelete,
VolumeId: string(ev.Kv.Key[len("/rfs/volumes/") : len(ev.Kv.Key)-1]),
}
}
}
}
}