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cache/predicate.go
52 строки
1 KB
Peter Chang
enable range/prefix/fromKey key filtering
16 июл 2025, 13:46
16 июл 2025, 13:46
792f763
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// Copyright 2025 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 cache import "bytes" type Prefix string func (prefix Prefix) Match(key []byte) bool { if prefix == "" { return true } prefixLen := len(prefix) return len(key) >= prefixLen && string(key[:prefixLen]) == string(prefix) } func ExactKey(key []byte) KeyPredicate { return func(k []byte) bool { return bytes.Equal(k, key) } } func FromKey(start []byte) KeyPredicate { return func(k []byte) bool { return bytes.Compare(k, start) >= 0 } } func Range(start, end []byte) KeyPredicate { return func(k []byte) bool { return bytes.Compare(k, start) >= 0 && bytes.Compare(k, end) < 0 } } func KeyPredForRange(start, end []byte) KeyPredicate { if len(end) == 0 { return ExactKey(start) } if len(end) == 1 && end[0] == 0 { return FromKey(start) } return Range(start, end) }