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etcdutils_clientv3.go
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etcdutils_clientv3.go
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package etcdutils
import (
"context"
"fmt"
"io"
"log"
"os"
"time"
"github.com/coreos/etcd/pkg/fileutil"
"github.com/coreos/etcd/clientv3"
"github.com/coreos/etcd/embed"
"github.com/coreos/etcd/clientv3/snapshot"
"go.uber.org/zap"
)
func SaveSnapshot(ctx context.Context, cfg clientv3.Config, dbPath string) error {
if len(cfg.Endpoints) != 1 {
return fmt.Errorf("snapshot must be requested to one selected node, not multiple %#v", cfg.Endpoints)
}
cli, err := clientv3.New(cfg)
if err != nil {
return err
}
defer cli.Close()
partpath := dbPath + ".part"
defer os.RemoveAll(partpath)
var f *os.File
f, err = os.OpenFile(partpath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, fileutil.PrivateFileMode)
if err != nil {
return fmt.Errorf("could not open %s (%v)", partpath, err)
}
now := time.Now()
var rd io.ReadCloser
rd, err = cli.Snapshot(ctx)
if err != nil {
return err
}
if _, err = io.Copy(f, rd); err != nil {
return err
}
if err = fileutil.Fsync(f); err != nil {
return err
}
if err = f.Close(); err != nil {
return err
}
log.Println(
"fetched snapshot",
cfg.Endpoints[0],
"took", time.Since(now),
)
if err = os.Rename(partpath, dbPath); err != nil {
return fmt.Errorf("could not rename %s to %s (%v)", partpath, dbPath, err)
}
log.Println("saved snapshot to path", dbPath)
return nil
}
func RestoreSnapshot(ctx context.Context, cfg embed.Config, peerURLs []string, dbPath string) error {
sp := snapshot.NewV3(zap.NewExample())
return sp.Restore(snapshot.RestoreConfig{
SnapshotPath: dbPath,
Name: cfg.Name,
OutputDataDir: cfg.Dir,
PeerURLs: peerURLs,
InitialCluster: cfg.InitialCluster,
InitialClusterToken: cfg.InitialClusterToken,
})
return nil
}
func EtcdMemberAdd(ctx context.Context, cfg clientv3.Config, newMemberName string, peerURLs []string) error {
cli, err := clientv3.New(cfg)
if err != nil {
return err
}
defer cli.Close()
mresp, err := cli.MemberAdd(ctx, peerURLs)
if err != nil {
return err
}
log.Println("added member.PeerURLs:", mresp.Member.PeerURLs)
return nil
}
func EtcdMemberRemove(ctx context.Context, cfg clientv3.Config, memberName string) error {
cli, err := clientv3.New(cfg)
if err != nil {
return err
}
defer cli.Close()
resp, err := cli.MemberList(ctx)
if err != nil {
return err
}
var id uint64 = 0
for _, m := range resp.Members {
if m.Name == memberName {
id = m.ID
break
}
}
if id == 0 {
return fmt.Errorf("member not found to remove")
}
_, err = cli.MemberRemove(ctx, id)
return err
}