215 lines
7.4 KiB
Go
215 lines
7.4 KiB
Go
// Copyright 2019 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/>.
|
|
|
|
package trie
|
|
|
|
import (
|
|
"encoding/binary"
|
|
"fmt"
|
|
"math"
|
|
"sync"
|
|
"sync/atomic"
|
|
"time"
|
|
|
|
"github.com/ethereum/go-ethereum/common"
|
|
"github.com/ethereum/go-ethereum/core/rawdb"
|
|
"github.com/ethereum/go-ethereum/ethdb"
|
|
"github.com/ethereum/go-ethereum/log"
|
|
"github.com/ethereum/go-ethereum/metrics"
|
|
"github.com/steakknife/bloomfilter"
|
|
)
|
|
|
|
var (
|
|
bloomAddMeter = metrics.NewRegisteredMeter("trie/bloom/add", nil)
|
|
bloomLoadMeter = metrics.NewRegisteredMeter("trie/bloom/load", nil)
|
|
bloomTestMeter = metrics.NewRegisteredMeter("trie/bloom/test", nil)
|
|
bloomMissMeter = metrics.NewRegisteredMeter("trie/bloom/miss", nil)
|
|
bloomFaultMeter = metrics.NewRegisteredMeter("trie/bloom/fault", nil)
|
|
bloomErrorGauge = metrics.NewRegisteredGauge("trie/bloom/error", nil)
|
|
)
|
|
|
|
// syncBloomHasher is a wrapper around a byte blob to satisfy the interface API
|
|
// requirements of the bloom library used. It's used to convert a trie hash or
|
|
// contract code hash into a 64 bit mini hash.
|
|
type syncBloomHasher []byte
|
|
|
|
func (f syncBloomHasher) Write(p []byte) (n int, err error) { panic("not implemented") }
|
|
func (f syncBloomHasher) Sum(b []byte) []byte { panic("not implemented") }
|
|
func (f syncBloomHasher) Reset() { panic("not implemented") }
|
|
func (f syncBloomHasher) BlockSize() int { panic("not implemented") }
|
|
func (f syncBloomHasher) Size() int { return 8 }
|
|
func (f syncBloomHasher) Sum64() uint64 { return binary.BigEndian.Uint64(f) }
|
|
|
|
// SyncBloom is a bloom filter used during fast sync to quickly decide if a trie
|
|
// node or contract code already exists on disk or not. It self populates from the
|
|
// provided disk database on creation in a background thread and will only start
|
|
// returning live results once that's finished.
|
|
type SyncBloom struct {
|
|
bloom *bloomfilter.Filter
|
|
inited uint32
|
|
closer sync.Once
|
|
closed uint32
|
|
pend sync.WaitGroup
|
|
}
|
|
|
|
// NewSyncBloom creates a new bloom filter of the given size (in megabytes) and
|
|
// initializes it from the database. The bloom is hard coded to use 3 filters.
|
|
func NewSyncBloom(memory uint64, database ethdb.Iteratee) *SyncBloom {
|
|
// Create the bloom filter to track known trie nodes
|
|
bloom, err := bloomfilter.New(memory*1024*1024*8, 3)
|
|
if err != nil {
|
|
panic(fmt.Sprintf("failed to create bloom: %v", err))
|
|
}
|
|
log.Info("Allocated fast sync bloom", "size", common.StorageSize(memory*1024*1024))
|
|
|
|
// Assemble the fast sync bloom and init it from previous sessions
|
|
b := &SyncBloom{
|
|
bloom: bloom,
|
|
}
|
|
b.pend.Add(2)
|
|
go func() {
|
|
defer b.pend.Done()
|
|
b.init(database)
|
|
}()
|
|
go func() {
|
|
defer b.pend.Done()
|
|
b.meter()
|
|
}()
|
|
return b
|
|
}
|
|
|
|
// init iterates over the database, pushing every trie hash into the bloom filter.
|
|
func (b *SyncBloom) init(database ethdb.Iteratee) {
|
|
// Iterate over the database, but restart every now and again to avoid holding
|
|
// a persistent snapshot since fast sync can push a ton of data concurrently,
|
|
// bloating the disk.
|
|
//
|
|
// Note, this is fine, because everything inserted into leveldb by fast sync is
|
|
// also pushed into the bloom directly, so we're not missing anything when the
|
|
// iterator is swapped out for a new one.
|
|
it := database.NewIterator(nil, nil)
|
|
|
|
var (
|
|
start = time.Now()
|
|
swap = time.Now()
|
|
)
|
|
for it.Next() && atomic.LoadUint32(&b.closed) == 0 {
|
|
// If the database entry is a trie node, add it to the bloom
|
|
key := it.Key()
|
|
if len(key) == common.HashLength {
|
|
b.bloom.Add(syncBloomHasher(key))
|
|
bloomLoadMeter.Mark(1)
|
|
}
|
|
// If the database entry is a contract code, add it to the bloom
|
|
if ok, hash := rawdb.IsCodeKey(key); ok {
|
|
b.bloom.Add(syncBloomHasher(hash))
|
|
bloomLoadMeter.Mark(1)
|
|
}
|
|
// If enough time elapsed since the last iterator swap, restart
|
|
if time.Since(swap) > 8*time.Second {
|
|
key := common.CopyBytes(it.Key())
|
|
|
|
it.Release()
|
|
it = database.NewIterator(nil, key)
|
|
|
|
log.Info("Initializing fast sync bloom", "items", b.bloom.N(), "errorrate", b.errorRate(), "elapsed", common.PrettyDuration(time.Since(start)))
|
|
swap = time.Now()
|
|
}
|
|
}
|
|
it.Release()
|
|
|
|
// Mark the bloom filter inited and return
|
|
log.Info("Initialized fast sync bloom", "items", b.bloom.N(), "errorrate", b.errorRate(), "elapsed", common.PrettyDuration(time.Since(start)))
|
|
atomic.StoreUint32(&b.inited, 1)
|
|
}
|
|
|
|
// meter periodically recalculates the false positive error rate of the bloom
|
|
// filter and reports it in a metric.
|
|
func (b *SyncBloom) meter() {
|
|
for {
|
|
// Report the current error ration. No floats, lame, scale it up.
|
|
bloomErrorGauge.Update(int64(b.errorRate() * 100000))
|
|
|
|
// Wait one second, but check termination more frequently
|
|
for i := 0; i < 10; i++ {
|
|
if atomic.LoadUint32(&b.closed) == 1 {
|
|
return
|
|
}
|
|
time.Sleep(100 * time.Millisecond)
|
|
}
|
|
}
|
|
}
|
|
|
|
// Close terminates any background initializer still running and releases all the
|
|
// memory allocated for the bloom.
|
|
func (b *SyncBloom) Close() error {
|
|
b.closer.Do(func() {
|
|
// Ensure the initializer is stopped
|
|
atomic.StoreUint32(&b.closed, 1)
|
|
b.pend.Wait()
|
|
|
|
// Wipe the bloom, but mark it "uninited" just in case someone attempts an access
|
|
log.Info("Deallocated fast sync bloom", "items", b.bloom.N(), "errorrate", b.errorRate())
|
|
|
|
atomic.StoreUint32(&b.inited, 0)
|
|
b.bloom = nil
|
|
})
|
|
return nil
|
|
}
|
|
|
|
// Add inserts a new trie node hash into the bloom filter.
|
|
func (b *SyncBloom) Add(hash []byte) {
|
|
if atomic.LoadUint32(&b.closed) == 1 {
|
|
return
|
|
}
|
|
b.bloom.Add(syncBloomHasher(hash))
|
|
bloomAddMeter.Mark(1)
|
|
}
|
|
|
|
// Contains tests if the bloom filter contains the given hash:
|
|
// - false: the bloom definitely does not contain hash
|
|
// - true: the bloom maybe contains hash
|
|
//
|
|
// While the bloom is being initialized, any query will return true.
|
|
func (b *SyncBloom) Contains(hash []byte) bool {
|
|
bloomTestMeter.Mark(1)
|
|
if atomic.LoadUint32(&b.inited) == 0 {
|
|
// We didn't load all the trie nodes from the previous run of Geth yet. As
|
|
// such, we can't say for sure if a hash is not present for anything. Until
|
|
// the init is done, we're faking "possible presence" for everything.
|
|
return true
|
|
}
|
|
// Bloom initialized, check the real one and report any successful misses
|
|
maybe := b.bloom.Contains(syncBloomHasher(hash))
|
|
if !maybe {
|
|
bloomMissMeter.Mark(1)
|
|
}
|
|
return maybe
|
|
}
|
|
|
|
// errorRate calculates the probability of a random containment test returning a
|
|
// false positive.
|
|
//
|
|
// We're calculating it ourselves because the bloom library we used missed a
|
|
// parentheses in the formula and calculates it wrong. And it's discontinued...
|
|
func (b *SyncBloom) errorRate() float64 {
|
|
k := float64(b.bloom.K())
|
|
n := float64(b.bloom.N())
|
|
m := float64(b.bloom.M())
|
|
|
|
return math.Pow(1.0-math.Exp((-k)*(n+0.5)/(m-1)), k)
|
|
}
|