本文整理汇总了Golang中github.com/coreos/etcd/clientv3.Client.Txn方法的典型用法代码示例。如果您正苦于以下问题：Golang Client.Txn方法的具体用法？Golang Client.Txn怎么用？Golang Client.Txn使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类github.com/coreos/etcd/clientv3.Client的用法示例。
在下文中一共展示了Client.Txn方法的3个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Golang代码示例。
示例1: makeMirror
func makeMirror(ctx context.Context, c *clientv3.Client, dc *clientv3.Client) error {
total := int64(0)
go func() {
for {
time.Sleep(30 * time.Second)
fmt.Println(atomic.LoadInt64(&total))
}
}()
// TODO: remove the prefix of the destination cluster?
s := mirror.NewSyncer(c, mmprefix, 0)
rc, errc := s.SyncBase(ctx)
for r := range rc {
for _, kv := range r.Kvs {
_, err := dc.Put(ctx, string(kv.Key), string(kv.Value))
if err != nil {
return err
}
atomic.AddInt64(&total, 1)
}
}
err := <-errc
if err != nil {
return err
}
wc := s.SyncUpdates(ctx)
for wr := range wc {
if wr.CompactRevision != 0 {
return rpctypes.ErrCompacted
}
var rev int64
ops := []clientv3.Op{}
for _, ev := range wr.Events {
nrev := ev.Kv.ModRevision
if rev != 0 && nrev > rev {
_, err := dc.Txn(ctx).Then(ops...).Commit()
if err != nil {
return err
}
ops = []clientv3.Op{}
}
switch ev.Type {
case storagepb.PUT:
ops = append(ops, clientv3.OpPut(string(ev.Kv.Key), string(ev.Kv.Value)))
atomic.AddInt64(&total, 1)
case storagepb.DELETE, storagepb.EXPIRE:
ops = append(ops, clientv3.OpDelete(string(ev.Kv.Key)))
atomic.AddInt64(&total, 1)
default:
panic("unexpected event type")
}
}
if len(ops) != 0 {
_, err := dc.Txn(ctx).Then(ops...).Commit()
if err != nil {
return err
}
}
}
return nil
}示例2: putKeyAtMostOnce
func putKeyAtMostOnce(ctx context.Context, client *clientv3.Client, key string) error {
gr, err := getKey(ctx, client, key)
if err != nil {
return err
}
var modrev int64
if len(gr.Kvs) > 0 {
modrev = gr.Kvs[0].ModRevision
}
for ctx.Err() == nil {
_, err := client.Txn(ctx).If(clientv3.Compare(clientv3.ModRevision(key), "=", modrev)).Then(clientv3.OpPut(key, key)).Commit()
if err == nil {
return nil
}
}
return ctx.Err()
}示例3: makeMirror
func makeMirror(ctx context.Context, c *clientv3.Client, dc *clientv3.Client) error {
total := int64(0)
go func() {
for {
time.Sleep(30 * time.Second)
fmt.Println(atomic.LoadInt64(&total))
}
}()
s := mirror.NewSyncer(c, mmprefix, 0)
rc, errc := s.SyncBase(ctx)
// if destination prefix is specified and remove destination prefix is true return error
if mmnodestprefix && len(mmdestprefix) > 0 {
ExitWithError(ExitBadArgs, fmt.Errorf("`--dest-prefix` and `--no-dest-prefix` cannot be set at the same time, choose one."))
}
// if remove destination prefix is false and destination prefix is empty set the value of destination prefix same as prefix
if !mmnodestprefix && len(mmdestprefix) == 0 {
mmdestprefix = mmprefix
}
for r := range rc {
for _, kv := range r.Kvs {
_, err := dc.Put(ctx, modifyPrefix(string(kv.Key)), string(kv.Value))
if err != nil {
return err
}
atomic.AddInt64(&total, 1)
}
}
err := <-errc
if err != nil {
return err
}
wc := s.SyncUpdates(ctx)
for wr := range wc {
if wr.CompactRevision != 0 {
return rpctypes.ErrCompacted
}
var rev int64
ops := []clientv3.Op{}
for _, ev := range wr.Events {
nrev := ev.Kv.ModRevision
if rev != 0 && nrev > rev {
_, err := dc.Txn(ctx).Then(ops...).Commit()
if err != nil {
return err
}
ops = []clientv3.Op{}
}
switch ev.Type {
case mvccpb.PUT:
ops = append(ops, clientv3.OpPut(modifyPrefix(string(ev.Kv.Key)), string(ev.Kv.Value)))
atomic.AddInt64(&total, 1)
case mvccpb.DELETE:
ops = append(ops, clientv3.OpDelete(modifyPrefix(string(ev.Kv.Key))))
atomic.AddInt64(&total, 1)
default:
panic("unexpected event type")
}
}
if len(ops) != 0 {
_, err := dc.Txn(ctx).Then(ops...).Commit()
if err != nil {
return err
}
}
}
return nil
}