mirror of
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34 lines
1.2 KiB
Go
34 lines
1.2 KiB
Go
// Copyright 2017 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 clientv3util contains utility functions derived from clientv3.
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package clientv3util
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import (
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"go.etcd.io/etcd/client/v3"
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)
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// KeyExists returns a comparison operation that evaluates to true iff the given
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// key exists. It does this by checking if the key `Version` is greater than 0.
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// It is a useful guard in transaction delete operations.
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func KeyExists(key string) clientv3.Cmp {
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return clientv3.Compare(clientv3.Version(key), ">", 0)
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}
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// KeyMissing returns a comparison operation that evaluates to true iff the
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// given key does not exist.
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func KeyMissing(key string) clientv3.Cmp {
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return clientv3.Compare(clientv3.Version(key), "=", 0)
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}
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