96 lines
3.0 KiB
Go
96 lines
3.0 KiB
Go
// Copyright 2022 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package trie
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import (
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"sync"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core/rawdb"
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"github.com/ethereum/go-ethereum/ethdb"
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)
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// preimageStore is the store for caching preimages of node key.
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type preimageStore struct {
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lock sync.RWMutex
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disk ethdb.KeyValueStore
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preimages map[common.Hash][]byte // Preimages of nodes from the secure trie
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preimagesSize common.StorageSize // Storage size of the preimages cache
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}
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// newPreimageStore initializes the store for caching preimages.
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func newPreimageStore(disk ethdb.KeyValueStore) *preimageStore {
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return &preimageStore{
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disk: disk,
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preimages: make(map[common.Hash][]byte),
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}
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}
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// insertPreimage writes a new trie node pre-image to the memory database if it's
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// yet unknown. The method will NOT make a copy of the slice, only use if the
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// preimage will NOT be changed later on.
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func (store *preimageStore) insertPreimage(preimages map[common.Hash][]byte) {
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store.lock.Lock()
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defer store.lock.Unlock()
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for hash, preimage := range preimages {
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if _, ok := store.preimages[hash]; ok {
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continue
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}
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store.preimages[hash] = preimage
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store.preimagesSize += common.StorageSize(common.HashLength + len(preimage))
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}
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}
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// preimage retrieves a cached trie node pre-image from memory. If it cannot be
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// found cached, the method queries the persistent database for the content.
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func (store *preimageStore) preimage(hash common.Hash) []byte {
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store.lock.RLock()
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preimage := store.preimages[hash]
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store.lock.RUnlock()
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if preimage != nil {
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return preimage
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}
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return rawdb.ReadPreimage(store.disk, hash)
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}
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// commit flushes the cached preimages into the disk.
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func (store *preimageStore) commit(force bool) error {
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store.lock.Lock()
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defer store.lock.Unlock()
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if store.preimagesSize <= 4*1024*1024 && !force {
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return nil
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}
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batch := store.disk.NewBatch()
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rawdb.WritePreimages(batch, store.preimages)
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if err := batch.Write(); err != nil {
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return err
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}
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store.preimages, store.preimagesSize = make(map[common.Hash][]byte), 0
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return nil
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}
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// size returns the current storage size of accumulated preimages.
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func (store *preimageStore) size() common.StorageSize {
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store.lock.RLock()
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defer store.lock.RUnlock()
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return store.preimagesSize
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}
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