142 lines
4.6 KiB
Go
142 lines
4.6 KiB
Go
// Copyright 2019 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 snapshot
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import (
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"sync"
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"github.com/allegro/bigcache"
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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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"github.com/ethereum/go-ethereum/rlp"
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)
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// diskLayer is a low level persistent snapshot built on top of a key-value store.
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type diskLayer struct {
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journal string // Path of the snapshot journal to use on shutdown
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db ethdb.KeyValueStore // Key-value store containing the base snapshot
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cache *bigcache.BigCache // Cache to avoid hitting the disk for direct access
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root common.Hash // Root hash of the base snapshot
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stale bool // Signals that the layer became stale (state progressed)
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lock sync.RWMutex
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}
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// Root returns root hash for which this snapshot was made.
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func (dl *diskLayer) Root() common.Hash {
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return dl.root
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}
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// Stale return whether this layer has become stale (was flattened across) or if
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// it's still live.
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func (dl *diskLayer) Stale() bool {
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dl.lock.RLock()
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defer dl.lock.RUnlock()
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return dl.stale
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}
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// Account directly retrieves the account associated with a particular hash in
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// the snapshot slim data format.
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func (dl *diskLayer) Account(hash common.Hash) (*Account, error) {
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data, err := dl.AccountRLP(hash)
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if err != nil {
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return nil, err
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}
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if len(data) == 0 { // can be both nil and []byte{}
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return nil, nil
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}
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account := new(Account)
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if err := rlp.DecodeBytes(data, account); err != nil {
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panic(err)
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}
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return account, nil
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}
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// AccountRLP directly retrieves the account RLP associated with a particular
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// hash in the snapshot slim data format.
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func (dl *diskLayer) AccountRLP(hash common.Hash) ([]byte, error) {
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dl.lock.RLock()
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defer dl.lock.RUnlock()
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// If the layer was flattened into, consider it invalid (any live reference to
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// the original should be marked as unusable).
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if dl.stale {
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return nil, ErrSnapshotStale
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}
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key := string(hash[:])
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// Try to retrieve the account from the memory cache
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if blob, err := dl.cache.Get(key); err == nil {
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snapshotCleanHitMeter.Mark(1)
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snapshotCleanReadMeter.Mark(int64(len(blob)))
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return blob, nil
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}
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// Cache doesn't contain account, pull from disk and cache for later
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blob := rawdb.ReadAccountSnapshot(dl.db, hash)
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dl.cache.Set(key, blob)
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snapshotCleanMissMeter.Mark(1)
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snapshotCleanWriteMeter.Mark(int64(len(blob)))
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return blob, nil
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}
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// Storage directly retrieves the storage data associated with a particular hash,
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// within a particular account.
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func (dl *diskLayer) Storage(accountHash, storageHash common.Hash) ([]byte, error) {
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dl.lock.RLock()
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defer dl.lock.RUnlock()
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// If the layer was flattened into, consider it invalid (any live reference to
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// the original should be marked as unusable).
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if dl.stale {
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return nil, ErrSnapshotStale
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}
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key := string(append(accountHash[:], storageHash[:]...))
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// Try to retrieve the storage slot from the memory cache
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if blob, err := dl.cache.Get(key); err == nil {
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snapshotCleanHitMeter.Mark(1)
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snapshotCleanReadMeter.Mark(int64(len(blob)))
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return blob, nil
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}
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// Cache doesn't contain storage slot, pull from disk and cache for later
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blob := rawdb.ReadStorageSnapshot(dl.db, accountHash, storageHash)
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dl.cache.Set(key, blob)
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snapshotCleanMissMeter.Mark(1)
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snapshotCleanWriteMeter.Mark(int64(len(blob)))
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return blob, nil
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}
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// Update creates a new layer on top of the existing snapshot diff tree with
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// the specified data items. Note, the maps are retained by the method to avoid
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// copying everything.
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func (dl *diskLayer) Update(blockHash common.Hash, accounts map[common.Hash][]byte, storage map[common.Hash]map[common.Hash][]byte) *diffLayer {
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return newDiffLayer(dl, blockHash, accounts, storage)
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}
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// Journal commits an entire diff hierarchy to disk into a single journal file.
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func (dl *diskLayer) Journal() error {
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// There's no journalling a disk layer
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return nil
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}
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