mirror of
https://gitlab.com/pulsechaincom/erigon-pulse.git
synced 2024-12-29 07:07:16 +00:00
56 lines
1.4 KiB
Go
56 lines
1.4 KiB
Go
/*
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Copyright 2021 Erigon contributors
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package recsplit
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import (
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"sync"
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"github.com/spaolacci/murmur3"
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)
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// IndexReader encapsulates Hash128 to allow concurrent access to Index
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type IndexReader struct {
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mu sync.RWMutex
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hasher murmur3.Hash128
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index *Index
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}
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// NewIndexReader creates new IndexReader
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func NewIndexReader(index *Index) *IndexReader {
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return &IndexReader{
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hasher: murmur3.New128WithSeed(index.salt),
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index: index,
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}
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}
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func (r *IndexReader) sum(key []byte) (uint64, uint64) {
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r.mu.Lock()
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defer r.mu.Unlock()
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r.hasher.Reset()
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r.hasher.Write(key) //nolint:errcheck
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return r.hasher.Sum128()
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}
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// Lookup wraps index Lookup
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func (r *IndexReader) Lookup(key []byte) uint64 {
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bucketHash, fingerprint := r.sum(key)
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if r.index != nil {
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return r.index.Lookup(bucketHash, fingerprint)
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}
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return 0
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}
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