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core, trie, eth, cmd: rework preimage store (ethereum#25287)
* core, trie, eth, cmd: rework preimage store * trie: address comment
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// Copyright 2022 The go-ethereum Authors | ||
// This file is part of the go-ethereum library. | ||
// | ||
// The go-ethereum library is free software: you can redistribute it and/or modify | ||
// it under the terms of the GNU Lesser General Public License as published by | ||
// the Free Software Foundation, either version 3 of the License, or | ||
// (at your option) any later version. | ||
// | ||
// The go-ethereum library is distributed in the hope that it will be useful, | ||
// but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
// GNU Lesser General Public License for more details. | ||
// | ||
// You should have received a copy of the GNU Lesser General Public License | ||
// 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 ( | ||
"sync" | ||
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"github.com/ethereum/go-ethereum/common" | ||
"github.com/ethereum/go-ethereum/core/rawdb" | ||
"github.com/ethereum/go-ethereum/ethdb" | ||
) | ||
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// preimageStore is the store for caching preimages of node key. | ||
type preimageStore struct { | ||
lock sync.RWMutex | ||
disk ethdb.KeyValueStore | ||
preimages map[common.Hash][]byte // Preimages of nodes from the secure trie | ||
preimagesSize common.StorageSize // Storage size of the preimages cache | ||
} | ||
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// newPreimageStore initializes the store for caching preimages. | ||
func newPreimageStore(disk ethdb.KeyValueStore) *preimageStore { | ||
return &preimageStore{ | ||
disk: disk, | ||
preimages: make(map[common.Hash][]byte), | ||
} | ||
} | ||
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// insertPreimage writes a new trie node pre-image to the memory database if it's | ||
// yet unknown. The method will NOT make a copy of the slice, only use if the | ||
// preimage will NOT be changed later on. | ||
func (store *preimageStore) insertPreimage(preimages map[common.Hash][]byte) { | ||
store.lock.Lock() | ||
defer store.lock.Unlock() | ||
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for hash, preimage := range preimages { | ||
if _, ok := store.preimages[hash]; ok { | ||
continue | ||
} | ||
store.preimages[hash] = preimage | ||
store.preimagesSize += common.StorageSize(common.HashLength + len(preimage)) | ||
} | ||
} | ||
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// preimage retrieves a cached trie node pre-image from memory. If it cannot be | ||
// found cached, the method queries the persistent database for the content. | ||
func (store *preimageStore) preimage(hash common.Hash) []byte { | ||
store.lock.RLock() | ||
preimage := store.preimages[hash] | ||
store.lock.RUnlock() | ||
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if preimage != nil { | ||
return preimage | ||
} | ||
return rawdb.ReadPreimage(store.disk, hash) | ||
} | ||
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// commit flushes the cached preimages into the disk. | ||
func (store *preimageStore) commit(force bool) error { | ||
store.lock.Lock() | ||
defer store.lock.Unlock() | ||
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if store.preimagesSize <= 4*1024*1024 && !force { | ||
return nil | ||
} | ||
batch := store.disk.NewBatch() | ||
rawdb.WritePreimages(batch, store.preimages) | ||
if err := batch.Write(); err != nil { | ||
return err | ||
} | ||
store.preimages, store.preimagesSize = make(map[common.Hash][]byte), 0 | ||
return nil | ||
} | ||
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// size returns the current storage size of accumulated preimages. | ||
func (store *preimageStore) size() common.StorageSize { | ||
store.lock.RLock() | ||
defer store.lock.RUnlock() | ||
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return store.preimagesSize | ||
} |
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