530 lines
17 KiB
Go
530 lines
17 KiB
Go
// Copyright 2017 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 light
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import (
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"bytes"
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"context"
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"encoding/binary"
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"errors"
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"fmt"
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"math/big"
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"time"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/common/bitutil"
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"github.com/ethereum/go-ethereum/core"
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"github.com/ethereum/go-ethereum/core/rawdb"
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"github.com/ethereum/go-ethereum/core/types"
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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/params"
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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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// IndexerConfig includes a set of configs for chain indexers.
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type IndexerConfig struct {
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// The block frequency for creating CHTs.
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ChtSize uint64
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// The number of confirmations needed to generate/accept a canonical hash help trie.
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ChtConfirms uint64
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// The block frequency for creating new bloom bits.
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BloomSize uint64
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// The number of confirmation needed before a bloom section is considered probably final and its rotated bits
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// are calculated.
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BloomConfirms uint64
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// The block frequency for creating BloomTrie.
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BloomTrieSize uint64
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// The number of confirmations needed to generate/accept a bloom trie.
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BloomTrieConfirms uint64
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}
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var (
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// DefaultServerIndexerConfig wraps a set of configs as a default indexer config for server side.
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DefaultServerIndexerConfig = &IndexerConfig{
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ChtSize: params.CHTFrequency,
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ChtConfirms: params.HelperTrieProcessConfirmations,
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BloomSize: params.BloomBitsBlocks,
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BloomConfirms: params.BloomConfirms,
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BloomTrieSize: params.BloomTrieFrequency,
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BloomTrieConfirms: params.HelperTrieProcessConfirmations,
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}
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// DefaultClientIndexerConfig wraps a set of configs as a default indexer config for client side.
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DefaultClientIndexerConfig = &IndexerConfig{
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ChtSize: params.CHTFrequency,
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ChtConfirms: params.HelperTrieConfirmations,
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BloomSize: params.BloomBitsBlocksClient,
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BloomConfirms: params.HelperTrieConfirmations,
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BloomTrieSize: params.BloomTrieFrequency,
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BloomTrieConfirms: params.HelperTrieConfirmations,
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}
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// TestServerIndexerConfig wraps a set of configs as a test indexer config for server side.
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TestServerIndexerConfig = &IndexerConfig{
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ChtSize: 128,
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ChtConfirms: 1,
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BloomSize: 16,
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BloomConfirms: 1,
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BloomTrieSize: 128,
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BloomTrieConfirms: 1,
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}
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// TestClientIndexerConfig wraps a set of configs as a test indexer config for client side.
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TestClientIndexerConfig = &IndexerConfig{
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ChtSize: 128,
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ChtConfirms: 8,
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BloomSize: 128,
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BloomConfirms: 8,
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BloomTrieSize: 128,
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BloomTrieConfirms: 8,
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}
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)
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var (
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errNoTrustedCht = errors.New("no trusted canonical hash trie")
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errNoTrustedBloomTrie = errors.New("no trusted bloom trie")
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errNoHeader = errors.New("header not found")
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)
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// ChtNode structures are stored in the Canonical Hash Trie in an RLP encoded format
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type ChtNode struct {
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Hash common.Hash
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Td *big.Int
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}
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// GetChtRoot reads the CHT root associated to the given section from the database
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func GetChtRoot(db ethdb.Database, sectionIdx uint64, sectionHead common.Hash) common.Hash {
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var encNumber [8]byte
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binary.BigEndian.PutUint64(encNumber[:], sectionIdx)
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data, _ := db.Get(append(append(rawdb.ChtPrefix, encNumber[:]...), sectionHead.Bytes()...))
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return common.BytesToHash(data)
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}
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// StoreChtRoot writes the CHT root associated to the given section into the database
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func StoreChtRoot(db ethdb.Database, sectionIdx uint64, sectionHead, root common.Hash) {
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var encNumber [8]byte
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binary.BigEndian.PutUint64(encNumber[:], sectionIdx)
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db.Put(append(append(rawdb.ChtPrefix, encNumber[:]...), sectionHead.Bytes()...), root.Bytes())
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}
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// ChtIndexerBackend implements core.ChainIndexerBackend.
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type ChtIndexerBackend struct {
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disablePruning bool
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diskdb, trieTable ethdb.Database
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odr OdrBackend
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triedb *trie.Database
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section, sectionSize uint64
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lastHash common.Hash
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trie *trie.Trie
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}
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// NewChtIndexer creates a Cht chain indexer
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func NewChtIndexer(db ethdb.Database, odr OdrBackend, size, confirms uint64, disablePruning bool) *core.ChainIndexer {
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trieTable := rawdb.NewTable(db, string(rawdb.ChtTablePrefix))
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backend := &ChtIndexerBackend{
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diskdb: db,
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odr: odr,
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trieTable: trieTable,
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triedb: trie.NewDatabaseWithConfig(trieTable, &trie.Config{Cache: 1}), // Use a tiny cache only to keep memory down
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sectionSize: size,
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disablePruning: disablePruning,
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}
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return core.NewChainIndexer(db, rawdb.NewTable(db, string(rawdb.ChtIndexTablePrefix)), backend, size, confirms, time.Millisecond*100, "cht")
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}
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// fetchMissingNodes tries to retrieve the last entry of the latest trusted CHT from the
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// ODR backend in order to be able to add new entries and calculate subsequent root hashes
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func (c *ChtIndexerBackend) fetchMissingNodes(ctx context.Context, section uint64, root common.Hash) error {
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batch := c.trieTable.NewBatch()
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r := &ChtRequest{ChtRoot: root, ChtNum: section - 1, BlockNum: section*c.sectionSize - 1, Config: c.odr.IndexerConfig()}
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for {
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err := c.odr.Retrieve(ctx, r)
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switch err {
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case nil:
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r.Proof.Store(batch)
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return batch.Write()
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case ErrNoPeers:
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// if there are no peers to serve, retry later
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select {
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case <-ctx.Done():
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return ctx.Err()
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case <-time.After(time.Second * 10):
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// stay in the loop and try again
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}
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default:
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return err
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}
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}
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}
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// Reset implements core.ChainIndexerBackend
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func (c *ChtIndexerBackend) Reset(ctx context.Context, section uint64, lastSectionHead common.Hash) error {
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var root common.Hash
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if section > 0 {
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root = GetChtRoot(c.diskdb, section-1, lastSectionHead)
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}
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var err error
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c.trie, err = trie.New(trie.TrieID(root), c.triedb)
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if err != nil && c.odr != nil {
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err = c.fetchMissingNodes(ctx, section, root)
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if err == nil {
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c.trie, err = trie.New(trie.TrieID(root), c.triedb)
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}
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}
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c.section = section
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return err
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}
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// Process implements core.ChainIndexerBackend
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func (c *ChtIndexerBackend) Process(ctx context.Context, header *types.Header) error {
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hash, num := header.Hash(), header.Number.Uint64()
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c.lastHash = hash
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td := rawdb.ReadTd(c.diskdb, hash, num)
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if td == nil {
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panic(nil)
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}
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var encNumber [8]byte
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binary.BigEndian.PutUint64(encNumber[:], num)
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data, _ := rlp.EncodeToBytes(ChtNode{hash, td})
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c.trie.Update(encNumber[:], data)
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return nil
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}
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// Commit implements core.ChainIndexerBackend
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func (c *ChtIndexerBackend) Commit() error {
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root, nodes, err := c.trie.Commit(false)
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if err != nil {
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return err
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}
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// Commit trie changes into trie database in case it's not nil.
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if nodes != nil {
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if err := c.triedb.Update(trie.NewWithNodeSet(nodes)); err != nil {
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return err
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}
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if err := c.triedb.Commit(root, false, nil); err != nil {
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return err
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}
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}
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// Re-create trie with newly generated root and updated database.
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c.trie, err = trie.New(trie.TrieID(root), c.triedb)
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if err != nil {
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return err
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}
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// Pruning historical trie nodes if necessary.
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if !c.disablePruning {
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it := c.trieTable.NewIterator(nil, nil)
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defer it.Release()
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var (
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deleted int
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batch = c.trieTable.NewBatch()
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t = time.Now()
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)
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hashes := make(map[common.Hash]struct{})
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if nodes != nil {
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for _, hash := range nodes.Hashes() {
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hashes[hash] = struct{}{}
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}
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}
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for it.Next() {
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trimmed := bytes.TrimPrefix(it.Key(), rawdb.ChtTablePrefix)
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if len(trimmed) == common.HashLength {
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if _, ok := hashes[common.BytesToHash(trimmed)]; !ok {
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batch.Delete(trimmed)
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deleted += 1
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}
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}
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}
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if err := batch.Write(); err != nil {
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return err
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}
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log.Debug("Prune historical CHT trie nodes", "deleted", deleted, "remaining", len(hashes), "elapsed", common.PrettyDuration(time.Since(t)))
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}
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log.Info("Storing CHT", "section", c.section, "head", fmt.Sprintf("%064x", c.lastHash), "root", fmt.Sprintf("%064x", root))
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StoreChtRoot(c.diskdb, c.section, c.lastHash, root)
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return nil
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}
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// Prune implements core.ChainIndexerBackend which deletes all chain data
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// (except hash<->number mappings) older than the specified threshold.
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func (c *ChtIndexerBackend) Prune(threshold uint64) error {
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// Short circuit if the light pruning is disabled.
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if c.disablePruning {
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return nil
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}
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t := time.Now()
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// Always keep genesis header in database.
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start, end := uint64(1), (threshold+1)*c.sectionSize
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var batch = c.diskdb.NewBatch()
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for {
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numbers, hashes := rawdb.ReadAllCanonicalHashes(c.diskdb, start, end, 10240)
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if len(numbers) == 0 {
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break
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}
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for i := 0; i < len(numbers); i++ {
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// Keep hash<->number mapping in database otherwise the hash based
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// API(e.g. GetReceipt, GetLogs) will be broken.
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//
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// Storage size wise, the size of a mapping is ~41bytes. For one
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// section is about 1.3MB which is acceptable.
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//
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// In order to totally get rid of this index, we need an additional
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// flag to specify how many historical data light client can serve.
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rawdb.DeleteCanonicalHash(batch, numbers[i])
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rawdb.DeleteBlockWithoutNumber(batch, hashes[i], numbers[i])
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}
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if batch.ValueSize() > ethdb.IdealBatchSize {
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if err := batch.Write(); err != nil {
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return err
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}
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batch.Reset()
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}
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start = numbers[len(numbers)-1] + 1
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}
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if err := batch.Write(); err != nil {
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return err
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}
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log.Debug("Prune history headers", "threshold", threshold, "elapsed", common.PrettyDuration(time.Since(t)))
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return nil
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}
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// GetBloomTrieRoot reads the BloomTrie root associated to the given section from the database
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func GetBloomTrieRoot(db ethdb.Database, sectionIdx uint64, sectionHead common.Hash) common.Hash {
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var encNumber [8]byte
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binary.BigEndian.PutUint64(encNumber[:], sectionIdx)
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data, _ := db.Get(append(append(rawdb.BloomTriePrefix, encNumber[:]...), sectionHead.Bytes()...))
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return common.BytesToHash(data)
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}
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// StoreBloomTrieRoot writes the BloomTrie root associated to the given section into the database
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func StoreBloomTrieRoot(db ethdb.Database, sectionIdx uint64, sectionHead, root common.Hash) {
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var encNumber [8]byte
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binary.BigEndian.PutUint64(encNumber[:], sectionIdx)
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db.Put(append(append(rawdb.BloomTriePrefix, encNumber[:]...), sectionHead.Bytes()...), root.Bytes())
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}
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// BloomTrieIndexerBackend implements core.ChainIndexerBackend
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type BloomTrieIndexerBackend struct {
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disablePruning bool
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diskdb, trieTable ethdb.Database
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triedb *trie.Database
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odr OdrBackend
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section uint64
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parentSize uint64
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size uint64
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bloomTrieRatio uint64
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trie *trie.Trie
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sectionHeads []common.Hash
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}
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// NewBloomTrieIndexer creates a BloomTrie chain indexer
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func NewBloomTrieIndexer(db ethdb.Database, odr OdrBackend, parentSize, size uint64, disablePruning bool) *core.ChainIndexer {
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trieTable := rawdb.NewTable(db, string(rawdb.BloomTrieTablePrefix))
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backend := &BloomTrieIndexerBackend{
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diskdb: db,
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odr: odr,
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trieTable: trieTable,
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triedb: trie.NewDatabaseWithConfig(trieTable, &trie.Config{Cache: 1}), // Use a tiny cache only to keep memory down
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parentSize: parentSize,
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size: size,
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disablePruning: disablePruning,
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}
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backend.bloomTrieRatio = size / parentSize
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backend.sectionHeads = make([]common.Hash, backend.bloomTrieRatio)
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return core.NewChainIndexer(db, rawdb.NewTable(db, string(rawdb.BloomTrieIndexPrefix)), backend, size, 0, time.Millisecond*100, "bloomtrie")
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}
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// fetchMissingNodes tries to retrieve the last entries of the latest trusted bloom trie from the
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// ODR backend in order to be able to add new entries and calculate subsequent root hashes
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func (b *BloomTrieIndexerBackend) fetchMissingNodes(ctx context.Context, section uint64, root common.Hash) error {
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indexCh := make(chan uint, types.BloomBitLength)
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type res struct {
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nodes *NodeSet
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err error
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}
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resCh := make(chan res, types.BloomBitLength)
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for i := 0; i < 20; i++ {
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go func() {
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for bitIndex := range indexCh {
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r := &BloomRequest{BloomTrieRoot: root, BloomTrieNum: section - 1, BitIdx: bitIndex, SectionIndexList: []uint64{section - 1}, Config: b.odr.IndexerConfig()}
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for {
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if err := b.odr.Retrieve(ctx, r); err == ErrNoPeers {
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// if there are no peers to serve, retry later
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select {
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case <-ctx.Done():
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resCh <- res{nil, ctx.Err()}
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return
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case <-time.After(time.Second * 10):
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// stay in the loop and try again
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}
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} else {
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resCh <- res{r.Proofs, err}
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break
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}
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}
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}
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}()
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}
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for i := uint(0); i < types.BloomBitLength; i++ {
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indexCh <- i
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}
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close(indexCh)
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batch := b.trieTable.NewBatch()
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for i := uint(0); i < types.BloomBitLength; i++ {
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res := <-resCh
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if res.err != nil {
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return res.err
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}
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res.nodes.Store(batch)
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}
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return batch.Write()
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}
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// Reset implements core.ChainIndexerBackend
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func (b *BloomTrieIndexerBackend) Reset(ctx context.Context, section uint64, lastSectionHead common.Hash) error {
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var root common.Hash
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if section > 0 {
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root = GetBloomTrieRoot(b.diskdb, section-1, lastSectionHead)
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}
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var err error
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b.trie, err = trie.New(trie.TrieID(root), b.triedb)
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if err != nil && b.odr != nil {
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err = b.fetchMissingNodes(ctx, section, root)
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if err == nil {
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b.trie, err = trie.New(trie.TrieID(root), b.triedb)
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}
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}
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b.section = section
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return err
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}
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// Process implements core.ChainIndexerBackend
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func (b *BloomTrieIndexerBackend) Process(ctx context.Context, header *types.Header) error {
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num := header.Number.Uint64() - b.section*b.size
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if (num+1)%b.parentSize == 0 {
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b.sectionHeads[num/b.parentSize] = header.Hash()
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}
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return nil
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}
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// Commit implements core.ChainIndexerBackend
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func (b *BloomTrieIndexerBackend) Commit() error {
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var compSize, decompSize uint64
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for i := uint(0); i < types.BloomBitLength; i++ {
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var encKey [10]byte
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binary.BigEndian.PutUint16(encKey[0:2], uint16(i))
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binary.BigEndian.PutUint64(encKey[2:10], b.section)
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var decomp []byte
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for j := uint64(0); j < b.bloomTrieRatio; j++ {
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data, err := rawdb.ReadBloomBits(b.diskdb, i, b.section*b.bloomTrieRatio+j, b.sectionHeads[j])
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if err != nil {
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return err
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}
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decompData, err2 := bitutil.DecompressBytes(data, int(b.parentSize/8))
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if err2 != nil {
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return err2
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}
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decomp = append(decomp, decompData...)
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}
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comp := bitutil.CompressBytes(decomp)
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decompSize += uint64(len(decomp))
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compSize += uint64(len(comp))
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if len(comp) > 0 {
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b.trie.Update(encKey[:], comp)
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} else {
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b.trie.Delete(encKey[:])
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}
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}
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root, nodes, err := b.trie.Commit(false)
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if err != nil {
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return err
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}
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// Commit trie changes into trie database in case it's not nil.
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if nodes != nil {
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if err := b.triedb.Update(trie.NewWithNodeSet(nodes)); err != nil {
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return err
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}
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if err := b.triedb.Commit(root, false, nil); err != nil {
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return err
|
|
}
|
|
}
|
|
// Re-create trie with newly generated root and updated database.
|
|
b.trie, err = trie.New(trie.TrieID(root), b.triedb)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
// Pruning historical trie nodes if necessary.
|
|
if !b.disablePruning {
|
|
it := b.trieTable.NewIterator(nil, nil)
|
|
defer it.Release()
|
|
|
|
var (
|
|
deleted int
|
|
batch = b.trieTable.NewBatch()
|
|
t = time.Now()
|
|
)
|
|
hashes := make(map[common.Hash]struct{})
|
|
if nodes != nil {
|
|
for _, hash := range nodes.Hashes() {
|
|
hashes[hash] = struct{}{}
|
|
}
|
|
}
|
|
for it.Next() {
|
|
trimmed := bytes.TrimPrefix(it.Key(), rawdb.BloomTrieTablePrefix)
|
|
if len(trimmed) == common.HashLength {
|
|
if _, ok := hashes[common.BytesToHash(trimmed)]; !ok {
|
|
batch.Delete(trimmed)
|
|
deleted += 1
|
|
}
|
|
}
|
|
}
|
|
if err := batch.Write(); err != nil {
|
|
return err
|
|
}
|
|
log.Debug("Prune historical bloom trie nodes", "deleted", deleted, "remaining", len(hashes), "elapsed", common.PrettyDuration(time.Since(t)))
|
|
}
|
|
sectionHead := b.sectionHeads[b.bloomTrieRatio-1]
|
|
StoreBloomTrieRoot(b.diskdb, b.section, sectionHead, root)
|
|
log.Info("Storing bloom trie", "section", b.section, "head", fmt.Sprintf("%064x", sectionHead), "root", fmt.Sprintf("%064x", root), "compression", float64(compSize)/float64(decompSize))
|
|
|
|
return nil
|
|
}
|
|
|
|
// Prune implements core.ChainIndexerBackend which deletes all
|
|
// bloombits which older than the specified threshold.
|
|
func (b *BloomTrieIndexerBackend) Prune(threshold uint64) error {
|
|
// Short circuit if the light pruning is disabled.
|
|
if b.disablePruning {
|
|
return nil
|
|
}
|
|
start := time.Now()
|
|
for i := uint(0); i < types.BloomBitLength; i++ {
|
|
rawdb.DeleteBloombits(b.diskdb, i, 0, threshold*b.bloomTrieRatio+b.bloomTrieRatio)
|
|
}
|
|
log.Debug("Prune history bloombits", "threshold", threshold, "elapsed", common.PrettyDuration(time.Since(start)))
|
|
return nil
|
|
}
|