133 lines
5.2 KiB
Go
133 lines
5.2 KiB
Go
// Copyright 2020 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 pruner
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import (
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"encoding/binary"
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"errors"
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"os"
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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/log"
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bloomfilter "github.com/holiman/bloomfilter/v2"
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)
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// stateBloomHasher is a wrapper around a byte blob to satisfy the interface API
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// requirements of the bloom library used. It's used to convert a trie hash or
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// contract code hash into a 64 bit mini hash.
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type stateBloomHasher []byte
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func (f stateBloomHasher) Write(p []byte) (n int, err error) { panic("not implemented") }
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func (f stateBloomHasher) Sum(b []byte) []byte { panic("not implemented") }
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func (f stateBloomHasher) Reset() { panic("not implemented") }
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func (f stateBloomHasher) BlockSize() int { panic("not implemented") }
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func (f stateBloomHasher) Size() int { return 8 }
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func (f stateBloomHasher) Sum64() uint64 { return binary.BigEndian.Uint64(f) }
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// stateBloom is a bloom filter used during the state convesion(snapshot->state).
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// The keys of all generated entries will be recorded here so that in the pruning
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// stage the entries belong to the specific version can be avoided for deletion.
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//
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// The false-positive is allowed here. The "false-positive" entries means they
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// actually don't belong to the specific version but they are not deleted in the
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// pruning. The downside of the false-positive allowance is we may leave some "dangling"
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// nodes in the disk. But in practice the it's very unlike the dangling node is
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// state root. So in theory this pruned state shouldn't be visited anymore. Another
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// potential issue is for fast sync. If we do another fast sync upon the pruned
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// database, it's problematic which will stop the expansion during the syncing.
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// TODO address it @rjl493456442 @holiman @karalabe.
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//
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// After the entire state is generated, the bloom filter should be persisted into
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// the disk. It indicates the whole generation procedure is finished.
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type stateBloom struct {
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bloom *bloomfilter.Filter
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}
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// newStateBloomWithSize creates a brand new state bloom for state generation.
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// The bloom filter will be created by the passing bloom filter size. According
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// to the https://hur.st/bloomfilter/?n=600000000&p=&m=2048MB&k=4, the parameters
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// are picked so that the false-positive rate for mainnet is low enough.
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func newStateBloomWithSize(size uint64) (*stateBloom, error) {
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bloom, err := bloomfilter.New(size*1024*1024*8, 4)
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if err != nil {
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return nil, err
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}
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log.Info("Initialized state bloom", "size", common.StorageSize(float64(bloom.M()/8)))
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return &stateBloom{bloom: bloom}, nil
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}
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// NewStateBloomFromDisk loads the state bloom from the given file.
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// In this case the assumption is held the bloom filter is complete.
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func NewStateBloomFromDisk(filename string) (*stateBloom, error) {
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bloom, _, err := bloomfilter.ReadFile(filename)
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if err != nil {
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return nil, err
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}
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return &stateBloom{bloom: bloom}, nil
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}
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// Commit flushes the bloom filter content into the disk and marks the bloom
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// as complete.
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func (bloom *stateBloom) Commit(filename, tempname string) error {
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// Write the bloom out into a temporary file
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_, err := bloom.bloom.WriteFile(tempname)
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if err != nil {
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return err
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}
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// Ensure the file is synced to disk
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f, err := os.OpenFile(tempname, os.O_RDWR, 0666)
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if err != nil {
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return err
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}
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if err := f.Sync(); err != nil {
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f.Close()
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return err
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}
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f.Close()
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// Move the teporary file into it's final location
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return os.Rename(tempname, filename)
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}
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// Put implements the KeyValueWriter interface. But here only the key is needed.
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func (bloom *stateBloom) Put(key []byte, value []byte) error {
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// If the key length is not 32bytes, ensure it's contract code
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// entry with new scheme.
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if len(key) != common.HashLength {
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isCode, codeKey := rawdb.IsCodeKey(key)
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if !isCode {
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return errors.New("invalid entry")
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}
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bloom.bloom.Add(stateBloomHasher(codeKey))
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return nil
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}
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bloom.bloom.Add(stateBloomHasher(key))
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return nil
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}
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// Delete removes the key from the key-value data store.
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func (bloom *stateBloom) Delete(key []byte) error { panic("not supported") }
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// Contain is the wrapper of the underlying contains function which
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// reports whether the key is contained.
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// - If it says yes, the key may be contained
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// - If it says no, the key is definitely not contained.
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func (bloom *stateBloom) Contain(key []byte) (bool, error) {
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return bloom.bloom.Contains(stateBloomHasher(key)), nil
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}
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