Revision dbde4f2d5e7ff5a4dfe3fe94bcfbe65679b82578 authored by Chao Chen on 04 May 2021, 01:21:33 UTC, committed by Chao Chen on 04 May 2021, 17:37:12 UTC
1 parent 15715dc
example_lease_test.go
// Copyright 2016 The etcd Authors
//
// 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 clientv3_test
import (
"context"
"fmt"
"log"
"go.etcd.io/etcd/clientv3"
)
func ExampleLease_grant() {
cli, err := clientv3.New(clientv3.Config{
Endpoints: endpoints,
DialTimeout: dialTimeout,
})
if err != nil {
log.Fatal(err)
}
defer cli.Close()
// minimum lease TTL is 5-second
resp, err := cli.Grant(context.TODO(), 5)
if err != nil {
log.Fatal(err)
}
// after 5 seconds, the key 'foo' will be removed
_, err = cli.Put(context.TODO(), "foo", "bar", clientv3.WithLease(resp.ID))
if err != nil {
log.Fatal(err)
}
}
func ExampleLease_revoke() {
cli, err := clientv3.New(clientv3.Config{
Endpoints: endpoints,
DialTimeout: dialTimeout,
})
if err != nil {
log.Fatal(err)
}
defer cli.Close()
resp, err := cli.Grant(context.TODO(), 5)
if err != nil {
log.Fatal(err)
}
_, err = cli.Put(context.TODO(), "foo", "bar", clientv3.WithLease(resp.ID))
if err != nil {
log.Fatal(err)
}
// revoking lease expires the key attached to its lease ID
_, err = cli.Revoke(context.TODO(), resp.ID)
if err != nil {
log.Fatal(err)
}
gresp, err := cli.Get(context.TODO(), "foo")
if err != nil {
log.Fatal(err)
}
fmt.Println("number of keys:", len(gresp.Kvs))
// Output: number of keys: 0
}
func ExampleLease_keepAlive() {
cli, err := clientv3.New(clientv3.Config{
Endpoints: endpoints,
DialTimeout: dialTimeout,
})
if err != nil {
log.Fatal(err)
}
defer cli.Close()
resp, err := cli.Grant(context.TODO(), 5)
if err != nil {
log.Fatal(err)
}
_, err = cli.Put(context.TODO(), "foo", "bar", clientv3.WithLease(resp.ID))
if err != nil {
log.Fatal(err)
}
// the key 'foo' will be kept forever
ch, kaerr := cli.KeepAlive(context.TODO(), resp.ID)
if kaerr != nil {
log.Fatal(kaerr)
}
ka := <-ch
fmt.Println("ttl:", ka.TTL)
// Output: ttl: 5
}
func ExampleLease_keepAliveOnce() {
cli, err := clientv3.New(clientv3.Config{
Endpoints: endpoints,
DialTimeout: dialTimeout,
})
if err != nil {
log.Fatal(err)
}
defer cli.Close()
resp, err := cli.Grant(context.TODO(), 5)
if err != nil {
log.Fatal(err)
}
_, err = cli.Put(context.TODO(), "foo", "bar", clientv3.WithLease(resp.ID))
if err != nil {
log.Fatal(err)
}
// to renew the lease only once
ka, kaerr := cli.KeepAliveOnce(context.TODO(), resp.ID)
if kaerr != nil {
log.Fatal(kaerr)
}
fmt.Println("ttl:", ka.TTL)
// Output: ttl: 5
}
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