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client/v3/clientv3util/example_key_test.go
66 строк
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Sasha Melentyev
all: goimports -w .
17 ноя 2022, 19:07
17 ноя 2022, 19:07
c3b6cbd
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// Copyright 2017 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 clientv3util_test import ( "context" "log" clientv3 "go.etcd.io/etcd/client/v3" "go.etcd.io/etcd/client/v3/clientv3util" ) func ExampleKeyMissing() { cli, err := clientv3.New(clientv3.Config{ Endpoints: []string{"127.0.0.1:2379"}, }) if err != nil { log.Fatal(err) } defer cli.Close() kvc := clientv3.NewKV(cli) // perform a put only if key is missing // It is useful to do the check atomically to avoid overwriting // the existing key which would generate potentially unwanted events, // unless of course you wanted to do an overwrite no matter what. _, err = kvc.Txn(context.Background()). If(clientv3util.KeyMissing("purpleidea")). Then(clientv3.OpPut("purpleidea", "hello world")). Commit() if err != nil { log.Fatal(err) } } func ExampleKeyExists() { cli, err := clientv3.New(clientv3.Config{ Endpoints: []string{"127.0.0.1:2379"}, }) if err != nil { log.Fatal(err) } defer cli.Close() kvc := clientv3.NewKV(cli) // perform a delete only if key already exists _, err = kvc.Txn(context.Background()). If(clientv3util.KeyExists("purpleidea")). Then(clientv3.OpDelete("purpleidea")). Commit() if err != nil { log.Fatal(err) } }