261 lines
8.9 KiB
Go
261 lines
8.9 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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"bytes"
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"encoding/binary"
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"math/big"
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"time"
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"github.com/VictoriaMetrics/fastcache"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/common/math"
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"github.com/ethereum/go-ethereum/core/rawdb"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/ethdb"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/rlp"
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"github.com/ethereum/go-ethereum/trie"
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)
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var (
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// emptyRoot is the known root hash of an empty trie.
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emptyRoot = common.HexToHash("56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421")
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// emptyCode is the known hash of the empty EVM bytecode.
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emptyCode = crypto.Keccak256Hash(nil)
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)
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// generatorStats is a collection of statistics gathered by the snapshot generator
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// for logging purposes.
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type generatorStats struct {
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wiping chan struct{} // Notification channel if wiping is in progress
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origin uint64 // Origin prefix where generation started
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start time.Time // Timestamp when generation started
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accounts uint64 // Number of accounts indexed
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slots uint64 // Number of storage slots indexed
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storage common.StorageSize // Account and storage slot size
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}
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// Log creates an contextual log with the given message and the context pulled
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// from the internally maintained statistics.
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func (gs *generatorStats) Log(msg string, marker []byte) {
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var ctx []interface{}
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// Figure out whether we're after or within an account
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switch len(marker) {
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case common.HashLength:
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ctx = append(ctx, []interface{}{"at", common.BytesToHash(marker)}...)
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case 2 * common.HashLength:
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ctx = append(ctx, []interface{}{
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"in", common.BytesToHash(marker[:common.HashLength]),
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"at", common.BytesToHash(marker[common.HashLength:]),
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}...)
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}
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// Add the usual measurements
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ctx = append(ctx, []interface{}{
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"accounts", gs.accounts,
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"slots", gs.slots,
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"storage", gs.storage,
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"elapsed", common.PrettyDuration(time.Since(gs.start)),
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}...)
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// Calculate the estimated indexing time based on current stats
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if len(marker) > 0 {
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if done := binary.BigEndian.Uint64(marker[:8]) - gs.origin; done > 0 {
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left := math.MaxUint64 - binary.BigEndian.Uint64(marker[:8])
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speed := done/uint64(time.Since(gs.start)/time.Millisecond+1) + 1 // +1s to avoid division by zero
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ctx = append(ctx, []interface{}{
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"eta", common.PrettyDuration(time.Duration(left/speed) * time.Millisecond),
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}...)
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}
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}
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log.Info(msg, ctx...)
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}
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// generateSnapshot regenerates a brand new snapshot based on an existing state
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// database and head block asynchronously. The snapshot is returned immediately
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// and generation is continued in the background until done.
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func generateSnapshot(diskdb ethdb.KeyValueStore, triedb *trie.Database, cache int, root common.Hash, wiper chan struct{}) *diskLayer {
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// Wipe any previously existing snapshot from the database if no wiper is
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// currently in progress.
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if wiper == nil {
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wiper = wipeSnapshot(diskdb, true)
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}
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// Create a new disk layer with an initialized state marker at zero
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rawdb.WriteSnapshotRoot(diskdb, root)
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base := &diskLayer{
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diskdb: diskdb,
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triedb: triedb,
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root: root,
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cache: fastcache.New(cache * 1024 * 1024),
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genMarker: []byte{}, // Initialized but empty!
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genAbort: make(chan chan *generatorStats),
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}
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go base.generate(&generatorStats{wiping: wiper, start: time.Now()})
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return base
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}
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// generate is a background thread that iterates over the state and storage tries,
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// constructing the state snapshot. All the arguments are purely for statistics
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// gethering and logging, since the method surfs the blocks as they arrive, often
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// being restarted.
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func (dl *diskLayer) generate(stats *generatorStats) {
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// If a database wipe is in operation, wait until it's done
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if stats.wiping != nil {
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stats.Log("Wiper running, state snapshotting paused", dl.genMarker)
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select {
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// If wiper is done, resume normal mode of operation
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case <-stats.wiping:
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stats.wiping = nil
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stats.start = time.Now()
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// If generator was aboted during wipe, return
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case abort := <-dl.genAbort:
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abort <- stats
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return
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}
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}
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// Create an account and state iterator pointing to the current generator marker
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accTrie, err := trie.NewSecure(dl.root, dl.triedb)
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if err != nil {
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// The account trie is missing (GC), surf the chain until one becomes available
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stats.Log("Trie missing, state snapshotting paused", dl.genMarker)
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abort := <-dl.genAbort
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abort <- stats
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return
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}
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stats.Log("Resuming state snapshot generation", dl.genMarker)
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var accMarker []byte
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if len(dl.genMarker) > 0 { // []byte{} is the start, use nil for that
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accMarker = dl.genMarker[:common.HashLength]
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}
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accIt := trie.NewIterator(accTrie.NodeIterator(accMarker))
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batch := dl.diskdb.NewBatch()
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// Iterate from the previous marker and continue generating the state snapshot
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logged := time.Now()
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for accIt.Next() {
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// Retrieve the current account and flatten it into the internal format
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accountHash := common.BytesToHash(accIt.Key)
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var acc struct {
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Nonce uint64
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Balance *big.Int
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Root common.Hash
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CodeHash []byte
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}
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if err := rlp.DecodeBytes(accIt.Value, &acc); err != nil {
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log.Crit("Invalid account encountered during snapshot creation", "err", err)
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}
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data := AccountRLP(acc.Nonce, acc.Balance, acc.Root, acc.CodeHash)
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// If the account is not yet in-progress, write it out
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if accMarker == nil || !bytes.Equal(accountHash[:], accMarker) {
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rawdb.WriteAccountSnapshot(batch, accountHash, data)
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stats.storage += common.StorageSize(1 + common.HashLength + len(data))
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stats.accounts++
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}
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// If we've exceeded our batch allowance or termination was requested, flush to disk
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var abort chan *generatorStats
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select {
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case abort = <-dl.genAbort:
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default:
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}
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if batch.ValueSize() > ethdb.IdealBatchSize || abort != nil {
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// Only write and set the marker if we actually did something useful
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if batch.ValueSize() > 0 {
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batch.Write()
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batch.Reset()
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dl.lock.Lock()
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dl.genMarker = accountHash[:]
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dl.lock.Unlock()
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}
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if abort != nil {
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stats.Log("Aborting state snapshot generation", accountHash[:])
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abort <- stats
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return
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}
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}
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// If the account is in-progress, continue where we left off (otherwise iterate all)
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if acc.Root != emptyRoot {
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storeTrie, err := trie.NewSecure(acc.Root, dl.triedb)
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if err != nil {
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log.Crit("Storage trie inaccessible for snapshot generation", "err", err)
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}
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var storeMarker []byte
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if accMarker != nil && bytes.Equal(accountHash[:], accMarker) && len(dl.genMarker) > common.HashLength {
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storeMarker = dl.genMarker[common.HashLength:]
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}
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storeIt := trie.NewIterator(storeTrie.NodeIterator(storeMarker))
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for storeIt.Next() {
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rawdb.WriteStorageSnapshot(batch, accountHash, common.BytesToHash(storeIt.Key), storeIt.Value)
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stats.storage += common.StorageSize(1 + 2*common.HashLength + len(storeIt.Value))
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stats.slots++
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// If we've exceeded our batch allowance or termination was requested, flush to disk
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var abort chan *generatorStats
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select {
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case abort = <-dl.genAbort:
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default:
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}
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if batch.ValueSize() > ethdb.IdealBatchSize || abort != nil {
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// Only write and set the marker if we actually did something useful
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if batch.ValueSize() > 0 {
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batch.Write()
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batch.Reset()
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dl.lock.Lock()
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dl.genMarker = append(accountHash[:], storeIt.Key...)
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dl.lock.Unlock()
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}
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if abort != nil {
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stats.Log("Aborting state snapshot generation", append(accountHash[:], storeIt.Key...))
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abort <- stats
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return
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}
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}
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}
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}
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if time.Since(logged) > 8*time.Second {
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stats.Log("Generating state snapshot", accIt.Key)
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logged = time.Now()
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}
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// Some account processed, unmark the marker
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accMarker = nil
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}
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// Snapshot fully generated, set the marker to nil
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if batch.ValueSize() > 0 {
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batch.Write()
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}
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log.Info("Generated state snapshot", "accounts", stats.accounts, "slots", stats.slots,
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"storage", stats.storage, "elapsed", common.PrettyDuration(time.Since(stats.start)))
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dl.lock.Lock()
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dl.genMarker = nil
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dl.lock.Unlock()
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// Someone will be looking for us, wait it out
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abort := <-dl.genAbort
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abort <- nil
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}
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