mirror of
https://github.com/etcd-io/etcd.git
synced 2024-09-27 06:25:44 +00:00
142 lines
2.9 KiB
Go
142 lines
2.9 KiB
Go
// Copyright 2016 The etcd Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package clientv3_test
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import (
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"context"
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"fmt"
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"log"
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"go.etcd.io/etcd/clientv3"
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)
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func ExampleLease_grant() {
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cli, err := clientv3.New(clientv3.Config{
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Endpoints: endpoints,
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DialTimeout: dialTimeout,
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})
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if err != nil {
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log.Fatal(err)
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}
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defer cli.Close()
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// minimum lease TTL is 5-second
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resp, err := cli.Grant(context.TODO(), 5)
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if err != nil {
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log.Fatal(err)
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}
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// after 5 seconds, the key 'foo' will be removed
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_, err = cli.Put(context.TODO(), "foo", "bar", clientv3.WithLease(resp.ID))
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if err != nil {
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log.Fatal(err)
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}
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}
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func ExampleLease_revoke() {
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cli, err := clientv3.New(clientv3.Config{
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Endpoints: endpoints,
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DialTimeout: dialTimeout,
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})
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if err != nil {
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log.Fatal(err)
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}
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defer cli.Close()
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resp, err := cli.Grant(context.TODO(), 5)
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if err != nil {
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log.Fatal(err)
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}
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_, err = cli.Put(context.TODO(), "foo", "bar", clientv3.WithLease(resp.ID))
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if err != nil {
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log.Fatal(err)
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}
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// revoking lease expires the key attached to its lease ID
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_, err = cli.Revoke(context.TODO(), resp.ID)
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if err != nil {
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log.Fatal(err)
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}
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gresp, err := cli.Get(context.TODO(), "foo")
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if err != nil {
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log.Fatal(err)
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}
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fmt.Println("number of keys:", len(gresp.Kvs))
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// Output: number of keys: 0
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}
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func ExampleLease_keepAlive() {
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cli, err := clientv3.New(clientv3.Config{
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Endpoints: endpoints,
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DialTimeout: dialTimeout,
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})
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if err != nil {
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log.Fatal(err)
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}
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defer cli.Close()
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resp, err := cli.Grant(context.TODO(), 5)
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if err != nil {
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log.Fatal(err)
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}
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_, err = cli.Put(context.TODO(), "foo", "bar", clientv3.WithLease(resp.ID))
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if err != nil {
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log.Fatal(err)
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}
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// the key 'foo' will be kept forever
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ch, kaerr := cli.KeepAlive(context.TODO(), resp.ID)
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if kaerr != nil {
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log.Fatal(kaerr)
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}
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ka := <-ch
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fmt.Println("ttl:", ka.TTL)
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// Output: ttl: 5
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}
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func ExampleLease_keepAliveOnce() {
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cli, err := clientv3.New(clientv3.Config{
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Endpoints: endpoints,
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DialTimeout: dialTimeout,
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})
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if err != nil {
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log.Fatal(err)
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}
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defer cli.Close()
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resp, err := cli.Grant(context.TODO(), 5)
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if err != nil {
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log.Fatal(err)
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}
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_, err = cli.Put(context.TODO(), "foo", "bar", clientv3.WithLease(resp.ID))
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if err != nil {
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log.Fatal(err)
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}
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// to renew the lease only once
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ka, kaerr := cli.KeepAliveOnce(context.TODO(), resp.ID)
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if kaerr != nil {
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log.Fatal(kaerr)
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}
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fmt.Println("ttl:", ka.TTL)
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// Output: ttl: 5
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}
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