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295 lines
11 KiB
295 lines
11 KiB
// Copyright 2016 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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"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/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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const (
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ChtFrequency = 32768
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ChtV1Frequency = 4096 // as long as we want to retain LES/1 compatibility, servers generate CHTs with the old, higher frequency
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HelperTrieConfirmations = 2048 // number of confirmations before a server is expected to have the given HelperTrie available
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HelperTrieProcessConfirmations = 256 // number of confirmations before a HelperTrie is generated
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)
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// trustedCheckpoint represents a set of post-processed trie roots (CHT and BloomTrie) associated with
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// the appropriate section index and head hash. It is used to start light syncing from this checkpoint
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// and avoid downloading the entire header chain while still being able to securely access old headers/logs.
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type trustedCheckpoint struct {
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name string
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sectionIdx uint64
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sectionHead, chtRoot, bloomTrieRoot common.Hash
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}
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var (
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mainnetCheckpoint = trustedCheckpoint{
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name: "ETH mainnet",
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sectionIdx: 129,
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sectionHead: common.HexToHash("64100587c8ec9a76870056d07cb0f58622552d16de6253a59cac4b580c899501"),
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chtRoot: common.HexToHash("bb4fb4076cbe6923c8a8ce8f158452bbe19564959313466989fda095a60884ca"),
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bloomTrieRoot: common.HexToHash("0db524b2c4a2a9520a42fd842b02d2e8fb58ff37c75cf57bd0eb82daeace6716"),
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}
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ropstenCheckpoint = trustedCheckpoint{
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name: "Ropsten testnet",
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sectionIdx: 50,
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sectionHead: common.HexToHash("00bd65923a1aa67f85e6b4ae67835784dd54be165c37f056691723c55bf016bd"),
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chtRoot: common.HexToHash("6f56dc61936752cc1f8c84b4addabdbe6a1c19693de3f21cb818362df2117f03"),
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bloomTrieRoot: common.HexToHash("aca7d7c504d22737242effc3fdc604a762a0af9ced898036b5986c3a15220208"),
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}
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)
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// trustedCheckpoints associates each known checkpoint with the genesis hash of the chain it belongs to
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var trustedCheckpoints = map[common.Hash]trustedCheckpoint{
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params.MainnetGenesisHash: mainnetCheckpoint,
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params.TestnetGenesisHash: ropstenCheckpoint,
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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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chtPrefix = []byte("chtRoot-") // chtPrefix + chtNum (uint64 big endian) -> trie root hash
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ChtTablePrefix = "cht-"
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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 assoctiated to the given section from the database
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// Note that sectionIdx is specified according to LES/1 CHT section size
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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(chtPrefix, encNumber[:]...), sectionHead.Bytes()...))
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return common.BytesToHash(data)
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}
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// GetChtV2Root reads the CHT root assoctiated to the given section from the database
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// Note that sectionIdx is specified according to LES/2 CHT section size
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func GetChtV2Root(db ethdb.Database, sectionIdx uint64, sectionHead common.Hash) common.Hash {
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return GetChtRoot(db, (sectionIdx+1)*(ChtFrequency/ChtV1Frequency)-1, sectionHead)
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}
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// StoreChtRoot writes the CHT root assoctiated to the given section into the database
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// Note that sectionIdx is specified according to LES/1 CHT section size
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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(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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db, cdb ethdb.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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// NewBloomTrieIndexer creates a BloomTrie chain indexer
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func NewChtIndexer(db ethdb.Database, clientMode bool) *core.ChainIndexer {
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cdb := ethdb.NewTable(db, ChtTablePrefix)
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idb := ethdb.NewTable(db, "chtIndex-")
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var sectionSize, confirmReq uint64
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if clientMode {
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sectionSize = ChtFrequency
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confirmReq = HelperTrieConfirmations
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} else {
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sectionSize = ChtV1Frequency
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confirmReq = HelperTrieProcessConfirmations
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}
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return core.NewChainIndexer(db, idb, &ChtIndexerBackend{db: db, cdb: cdb, sectionSize: sectionSize}, sectionSize, confirmReq, time.Millisecond*100, "cht")
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}
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// Reset implements core.ChainIndexerBackend
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func (c *ChtIndexerBackend) Reset(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.db, section-1, lastSectionHead)
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}
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var err error
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c.trie, err = trie.New(root, c.cdb)
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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(header *types.Header) {
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hash, num := header.Hash(), header.Number.Uint64()
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c.lastHash = hash
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td := core.GetTd(c.db, 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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}
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// Commit implements core.ChainIndexerBackend
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func (c *ChtIndexerBackend) Commit() error {
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batch := c.cdb.NewBatch()
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root, err := c.trie.CommitTo(batch)
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if err != nil {
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return err
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} else {
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batch.Write()
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if ((c.section+1)*c.sectionSize)%ChtFrequency == 0 {
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log.Info("Storing CHT", "idx", c.section*c.sectionSize/ChtFrequency, "sectionHead", fmt.Sprintf("%064x", c.lastHash), "root", fmt.Sprintf("%064x", root))
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}
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StoreChtRoot(c.db, c.section, c.lastHash, root)
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}
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return nil
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}
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const (
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BloomTrieFrequency = 32768
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ethBloomBitsSection = 4096
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ethBloomBitsConfirmations = 256
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)
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var (
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bloomTriePrefix = []byte("bltRoot-") // bloomTriePrefix + bloomTrieNum (uint64 big endian) -> trie root hash
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BloomTrieTablePrefix = "blt-"
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)
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// GetBloomTrieRoot reads the BloomTrie root assoctiated 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(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 assoctiated 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(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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db, cdb ethdb.Database
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section, parentSectionSize, 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, clientMode bool) *core.ChainIndexer {
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cdb := ethdb.NewTable(db, BloomTrieTablePrefix)
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idb := ethdb.NewTable(db, "bltIndex-")
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backend := &BloomTrieIndexerBackend{db: db, cdb: cdb}
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var confirmReq uint64
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if clientMode {
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backend.parentSectionSize = BloomTrieFrequency
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confirmReq = HelperTrieConfirmations
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} else {
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backend.parentSectionSize = ethBloomBitsSection
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confirmReq = HelperTrieProcessConfirmations
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}
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backend.bloomTrieRatio = BloomTrieFrequency / backend.parentSectionSize
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backend.sectionHeads = make([]common.Hash, backend.bloomTrieRatio)
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return core.NewChainIndexer(db, idb, backend, BloomTrieFrequency, confirmReq-ethBloomBitsConfirmations, time.Millisecond*100, "bloomtrie")
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}
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// Reset implements core.ChainIndexerBackend
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func (b *BloomTrieIndexerBackend) Reset(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.db, section-1, lastSectionHead)
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}
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var err error
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b.trie, err = trie.New(root, b.cdb)
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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(header *types.Header) {
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num := header.Number.Uint64() - b.section*BloomTrieFrequency
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if (num+1)%b.parentSectionSize == 0 {
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b.sectionHeads[num/b.parentSectionSize] = header.Hash()
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}
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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 := core.GetBloomBits(b.db, 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.parentSectionSize/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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batch := b.cdb.NewBatch()
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root, err := b.trie.CommitTo(batch)
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if err != nil {
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return err
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} else {
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batch.Write()
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sectionHead := b.sectionHeads[b.bloomTrieRatio-1]
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log.Info("Storing BloomTrie", "section", b.section, "sectionHead", fmt.Sprintf("%064x", sectionHead), "root", fmt.Sprintf("%064x", root), "compression ratio", float64(compSize)/float64(decompSize))
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StoreBloomTrieRoot(b.db, b.section, sectionHead, root)
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}
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return nil
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}
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