| // 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 contains utility functions derived from clientv3. |
| package clientv3util |
| |
| import ( |
| "github.com/coreos/etcd/clientv3" |
| ) |
| |
| // KeyExists returns a comparison operation that evaluates to true iff the given |
| // key exists. It does this by checking if the key `Version` is greater than 0. |
| // It is a useful guard in transaction delete operations. |
| func KeyExists(key string) clientv3.Cmp { |
| return clientv3.Compare(clientv3.Version(key), ">", 0) |
| } |
| |
| // KeyMissing returns a comparison operation that evaluates to true iff the |
| // given key does not exist. |
| func KeyMissing(key string) clientv3.Cmp { |
| return clientv3.Compare(clientv3.Version(key), "=", 0) |
| } |