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550 lines
19 KiB
550 lines
19 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 implements on-demand retrieval capable state and chain objects
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// for the Ethereum Light Client.
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package light
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import (
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"context"
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"errors"
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"math/big"
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"sync"
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"sync/atomic"
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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/lru"
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"github.com/ethereum/go-ethereum/consensus"
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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/state"
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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/event"
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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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)
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var (
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bodyCacheLimit = 256
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blockCacheLimit = 256
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)
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// LightChain represents a canonical chain that by default only handles block
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// headers, downloading block bodies and receipts on demand through an ODR
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// interface. It only does header validation during chain insertion.
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type LightChain struct {
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hc *core.HeaderChain
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indexerConfig *IndexerConfig
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chainDb ethdb.Database
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engine consensus.Engine
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odr OdrBackend
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chainFeed event.Feed
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chainSideFeed event.Feed
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chainHeadFeed event.Feed
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scope event.SubscriptionScope
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genesisBlock *types.Block
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forker *core.ForkChoice
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bodyCache *lru.Cache[common.Hash, *types.Body]
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bodyRLPCache *lru.Cache[common.Hash, rlp.RawValue]
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blockCache *lru.Cache[common.Hash, *types.Block]
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chainmu sync.RWMutex // protects header inserts
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quit chan struct{}
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wg sync.WaitGroup
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// Atomic boolean switches:
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stopped atomic.Bool // whether LightChain is stopped or running
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procInterrupt atomic.Bool // interrupts chain insert
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disableCheckFreq atomic.Bool // disables header verification
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}
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// NewLightChain returns a fully initialised light chain using information
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// available in the database. It initialises the default Ethereum header
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// validator.
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func NewLightChain(odr OdrBackend, config *params.ChainConfig, engine consensus.Engine) (*LightChain, error) {
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bc := &LightChain{
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chainDb: odr.Database(),
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indexerConfig: odr.IndexerConfig(),
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odr: odr,
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quit: make(chan struct{}),
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bodyCache: lru.NewCache[common.Hash, *types.Body](bodyCacheLimit),
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bodyRLPCache: lru.NewCache[common.Hash, rlp.RawValue](bodyCacheLimit),
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blockCache: lru.NewCache[common.Hash, *types.Block](blockCacheLimit),
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engine: engine,
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}
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bc.forker = core.NewForkChoice(bc, nil)
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var err error
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bc.hc, err = core.NewHeaderChain(odr.Database(), config, bc.engine, bc.getProcInterrupt)
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if err != nil {
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return nil, err
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}
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bc.genesisBlock, _ = bc.GetBlockByNumber(NoOdr, 0)
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if bc.genesisBlock == nil {
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return nil, core.ErrNoGenesis
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}
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if err := bc.loadLastState(); err != nil {
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return nil, err
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}
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// Check the current state of the block hashes and make sure that we do not have any of the bad blocks in our chain
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for hash := range core.BadHashes {
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if header := bc.GetHeaderByHash(hash); header != nil {
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log.Error("Found bad hash, rewinding chain", "number", header.Number, "hash", header.ParentHash)
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bc.SetHead(header.Number.Uint64() - 1)
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log.Info("Chain rewind was successful, resuming normal operation")
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}
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}
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return bc, nil
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}
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func (lc *LightChain) getProcInterrupt() bool {
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return lc.procInterrupt.Load()
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}
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// Odr returns the ODR backend of the chain
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func (lc *LightChain) Odr() OdrBackend {
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return lc.odr
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}
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// HeaderChain returns the underlying header chain.
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func (lc *LightChain) HeaderChain() *core.HeaderChain {
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return lc.hc
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}
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// loadLastState loads the last known chain state from the database. This method
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// assumes that the chain manager mutex is held.
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func (lc *LightChain) loadLastState() error {
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if head := rawdb.ReadHeadHeaderHash(lc.chainDb); head == (common.Hash{}) {
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// Corrupt or empty database, init from scratch
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lc.Reset()
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} else {
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header := lc.GetHeaderByHash(head)
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if header == nil {
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// Corrupt or empty database, init from scratch
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lc.Reset()
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} else {
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lc.hc.SetCurrentHeader(header)
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}
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}
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// Issue a status log and return
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header := lc.hc.CurrentHeader()
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headerTd := lc.GetTd(header.Hash(), header.Number.Uint64())
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log.Info("Loaded most recent local header", "number", header.Number, "hash", header.Hash(), "td", headerTd, "age", common.PrettyAge(time.Unix(int64(header.Time), 0)))
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return nil
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}
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// SetHead rewinds the local chain to a new head. Everything above the new
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// head will be deleted and the new one set.
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func (lc *LightChain) SetHead(head uint64) error {
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lc.chainmu.Lock()
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defer lc.chainmu.Unlock()
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lc.hc.SetHead(head, nil, nil)
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return lc.loadLastState()
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}
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// SetHeadWithTimestamp rewinds the local chain to a new head that has at max
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// the given timestamp. Everything above the new head will be deleted and the
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// new one set.
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func (lc *LightChain) SetHeadWithTimestamp(timestamp uint64) error {
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lc.chainmu.Lock()
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defer lc.chainmu.Unlock()
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lc.hc.SetHeadWithTimestamp(timestamp, nil, nil)
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return lc.loadLastState()
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}
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// GasLimit returns the gas limit of the current HEAD block.
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func (lc *LightChain) GasLimit() uint64 {
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return lc.hc.CurrentHeader().GasLimit
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}
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// Reset purges the entire blockchain, restoring it to its genesis state.
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func (lc *LightChain) Reset() {
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lc.ResetWithGenesisBlock(lc.genesisBlock)
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}
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// ResetWithGenesisBlock purges the entire blockchain, restoring it to the
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// specified genesis state.
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func (lc *LightChain) ResetWithGenesisBlock(genesis *types.Block) {
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// Dump the entire block chain and purge the caches
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lc.SetHead(0)
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lc.chainmu.Lock()
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defer lc.chainmu.Unlock()
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// Prepare the genesis block and reinitialise the chain
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batch := lc.chainDb.NewBatch()
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rawdb.WriteTd(batch, genesis.Hash(), genesis.NumberU64(), genesis.Difficulty())
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rawdb.WriteBlock(batch, genesis)
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rawdb.WriteHeadHeaderHash(batch, genesis.Hash())
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if err := batch.Write(); err != nil {
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log.Crit("Failed to reset genesis block", "err", err)
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}
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lc.genesisBlock = genesis
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lc.hc.SetGenesis(lc.genesisBlock.Header())
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lc.hc.SetCurrentHeader(lc.genesisBlock.Header())
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}
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// Accessors
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// Engine retrieves the light chain's consensus engine.
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func (lc *LightChain) Engine() consensus.Engine { return lc.engine }
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// Genesis returns the genesis block
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func (lc *LightChain) Genesis() *types.Block {
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return lc.genesisBlock
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}
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func (lc *LightChain) StateCache() state.Database {
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panic("not implemented")
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}
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// GetBody retrieves a block body (transactions and uncles) from the database
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// or ODR service by hash, caching it if found.
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func (lc *LightChain) GetBody(ctx context.Context, hash common.Hash) (*types.Body, error) {
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// Short circuit if the body's already in the cache, retrieve otherwise
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if cached, ok := lc.bodyCache.Get(hash); ok {
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return cached, nil
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}
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number := lc.hc.GetBlockNumber(hash)
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if number == nil {
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return nil, errors.New("unknown block")
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}
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body, err := GetBody(ctx, lc.odr, hash, *number)
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if err != nil {
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return nil, err
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}
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// Cache the found body for next time and return
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lc.bodyCache.Add(hash, body)
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return body, nil
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}
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// GetBodyRLP retrieves a block body in RLP encoding from the database or
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// ODR service by hash, caching it if found.
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func (lc *LightChain) GetBodyRLP(ctx context.Context, hash common.Hash) (rlp.RawValue, error) {
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// Short circuit if the body's already in the cache, retrieve otherwise
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if cached, ok := lc.bodyRLPCache.Get(hash); ok {
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return cached, nil
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}
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number := lc.hc.GetBlockNumber(hash)
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if number == nil {
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return nil, errors.New("unknown block")
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}
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body, err := GetBodyRLP(ctx, lc.odr, hash, *number)
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if err != nil {
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return nil, err
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}
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// Cache the found body for next time and return
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lc.bodyRLPCache.Add(hash, body)
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return body, nil
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}
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// HasBlock checks if a block is fully present in the database or not, caching
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// it if present.
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func (lc *LightChain) HasBlock(hash common.Hash, number uint64) bool {
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blk, _ := lc.GetBlock(NoOdr, hash, number)
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return blk != nil
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}
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// GetBlock retrieves a block from the database or ODR service by hash and number,
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// caching it if found.
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func (lc *LightChain) GetBlock(ctx context.Context, hash common.Hash, number uint64) (*types.Block, error) {
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// Short circuit if the block's already in the cache, retrieve otherwise
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if block, ok := lc.blockCache.Get(hash); ok {
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return block, nil
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}
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block, err := GetBlock(ctx, lc.odr, hash, number)
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if err != nil {
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return nil, err
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}
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// Cache the found block for next time and return
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lc.blockCache.Add(block.Hash(), block)
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return block, nil
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}
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// GetBlockByHash retrieves a block from the database or ODR service by hash,
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// caching it if found.
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func (lc *LightChain) GetBlockByHash(ctx context.Context, hash common.Hash) (*types.Block, error) {
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number := lc.hc.GetBlockNumber(hash)
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if number == nil {
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return nil, errors.New("unknown block")
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}
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return lc.GetBlock(ctx, hash, *number)
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}
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// GetBlockByNumber retrieves a block from the database or ODR service by
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// number, caching it (associated with its hash) if found.
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func (lc *LightChain) GetBlockByNumber(ctx context.Context, number uint64) (*types.Block, error) {
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hash, err := GetCanonicalHash(ctx, lc.odr, number)
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if hash == (common.Hash{}) || err != nil {
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return nil, err
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}
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return lc.GetBlock(ctx, hash, number)
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}
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// Stop stops the blockchain service. If any imports are currently in progress
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// it will abort them using the procInterrupt.
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func (lc *LightChain) Stop() {
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if !lc.stopped.CompareAndSwap(false, true) {
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return
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}
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close(lc.quit)
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lc.StopInsert()
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lc.wg.Wait()
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log.Info("Blockchain stopped")
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}
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// StopInsert interrupts all insertion methods, causing them to return
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// errInsertionInterrupted as soon as possible. Insertion is permanently disabled after
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// calling this method.
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func (lc *LightChain) StopInsert() {
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lc.procInterrupt.Store(true)
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}
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// Rollback is designed to remove a chain of links from the database that aren't
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// certain enough to be valid.
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func (lc *LightChain) Rollback(chain []common.Hash) {
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lc.chainmu.Lock()
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defer lc.chainmu.Unlock()
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batch := lc.chainDb.NewBatch()
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for i := len(chain) - 1; i >= 0; i-- {
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hash := chain[i]
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// Degrade the chain markers if they are explicitly reverted.
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// In theory we should update all in-memory markers in the
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// last step, however the direction of rollback is from high
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// to low, so it's safe the update in-memory markers directly.
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if head := lc.hc.CurrentHeader(); head.Hash() == hash {
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rawdb.WriteHeadHeaderHash(batch, head.ParentHash)
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lc.hc.SetCurrentHeader(lc.GetHeader(head.ParentHash, head.Number.Uint64()-1))
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}
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}
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if err := batch.Write(); err != nil {
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log.Crit("Failed to rollback light chain", "error", err)
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}
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}
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func (lc *LightChain) InsertHeader(header *types.Header) error {
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// Verify the header first before obtaining the lock
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headers := []*types.Header{header}
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if _, err := lc.hc.ValidateHeaderChain(headers, 100); err != nil {
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return err
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}
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// Make sure only one thread manipulates the chain at once
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lc.chainmu.Lock()
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defer lc.chainmu.Unlock()
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lc.wg.Add(1)
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defer lc.wg.Done()
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_, err := lc.hc.WriteHeaders(headers)
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log.Info("Inserted header", "number", header.Number, "hash", header.Hash())
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return err
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}
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func (lc *LightChain) SetCanonical(header *types.Header) error {
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lc.chainmu.Lock()
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defer lc.chainmu.Unlock()
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lc.wg.Add(1)
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defer lc.wg.Done()
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if err := lc.hc.Reorg([]*types.Header{header}); err != nil {
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return err
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}
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// Emit events
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block := types.NewBlockWithHeader(header)
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lc.chainFeed.Send(core.ChainEvent{Block: block, Hash: block.Hash()})
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lc.chainHeadFeed.Send(core.ChainHeadEvent{Block: block})
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log.Info("Set the chain head", "number", block.Number(), "hash", block.Hash())
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return nil
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}
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// InsertHeaderChain attempts to insert the given header chain in to the local
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// chain, possibly creating a reorg. If an error is returned, it will return the
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// index number of the failing header as well an error describing what went wrong.
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//
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// The verify parameter can be used to fine tune whether nonce verification
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// should be done or not. The reason behind the optional check is because some
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// of the header retrieval mechanisms already need to verify nonces, as well as
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// because nonces can be verified sparsely, not needing to check each.
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//
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// In the case of a light chain, InsertHeaderChain also creates and posts light
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// chain events when necessary.
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func (lc *LightChain) InsertHeaderChain(chain []*types.Header, checkFreq int) (int, error) {
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if len(chain) == 0 {
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return 0, nil
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}
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if lc.disableCheckFreq.Load() {
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checkFreq = 0
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}
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start := time.Now()
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if i, err := lc.hc.ValidateHeaderChain(chain, checkFreq); err != nil {
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return i, err
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}
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// Make sure only one thread manipulates the chain at once
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lc.chainmu.Lock()
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defer lc.chainmu.Unlock()
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lc.wg.Add(1)
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defer lc.wg.Done()
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status, err := lc.hc.InsertHeaderChain(chain, start, lc.forker)
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if err != nil || len(chain) == 0 {
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return 0, err
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}
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// Create chain event for the new head block of this insertion.
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var (
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lastHeader = chain[len(chain)-1]
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block = types.NewBlockWithHeader(lastHeader)
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)
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switch status {
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case core.CanonStatTy:
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lc.chainFeed.Send(core.ChainEvent{Block: block, Hash: block.Hash()})
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lc.chainHeadFeed.Send(core.ChainHeadEvent{Block: block})
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case core.SideStatTy:
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lc.chainSideFeed.Send(core.ChainSideEvent{Block: block})
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}
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return 0, err
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}
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// CurrentHeader retrieves the current head header of the canonical chain. The
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// header is retrieved from the HeaderChain's internal cache.
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func (lc *LightChain) CurrentHeader() *types.Header {
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return lc.hc.CurrentHeader()
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}
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// GetTd retrieves a block's total difficulty in the canonical chain from the
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// database by hash and number, caching it if found.
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func (lc *LightChain) GetTd(hash common.Hash, number uint64) *big.Int {
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return lc.hc.GetTd(hash, number)
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}
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// GetTdOdr retrieves the total difficult from the database or
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// network by hash and number, caching it (associated with its hash) if found.
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func (lc *LightChain) GetTdOdr(ctx context.Context, hash common.Hash, number uint64) *big.Int {
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td := lc.GetTd(hash, number)
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if td != nil {
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return td
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}
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td, _ = GetTd(ctx, lc.odr, hash, number)
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return td
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}
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// GetHeader retrieves a block header from the database by hash and number,
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// caching it if found.
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func (lc *LightChain) GetHeader(hash common.Hash, number uint64) *types.Header {
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return lc.hc.GetHeader(hash, number)
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}
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// GetHeaderByHash retrieves a block header from the database by hash, caching it if
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// found.
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func (lc *LightChain) GetHeaderByHash(hash common.Hash) *types.Header {
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return lc.hc.GetHeaderByHash(hash)
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}
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// HasHeader checks if a block header is present in the database or not, caching
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// it if present.
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func (lc *LightChain) HasHeader(hash common.Hash, number uint64) bool {
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return lc.hc.HasHeader(hash, number)
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}
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// GetCanonicalHash returns the canonical hash for a given block number
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func (bc *LightChain) GetCanonicalHash(number uint64) common.Hash {
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return bc.hc.GetCanonicalHash(number)
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}
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// GetAncestor retrieves the Nth ancestor of a given block. It assumes that either the given block or
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// a close ancestor of it is canonical. maxNonCanonical points to a downwards counter limiting the
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// number of blocks to be individually checked before we reach the canonical chain.
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//
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// Note: ancestor == 0 returns the same block, 1 returns its parent and so on.
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func (lc *LightChain) GetAncestor(hash common.Hash, number, ancestor uint64, maxNonCanonical *uint64) (common.Hash, uint64) {
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return lc.hc.GetAncestor(hash, number, ancestor, maxNonCanonical)
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}
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|
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// GetHeaderByNumber retrieves a block header from the database by number,
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|
// caching it (associated with its hash) if found.
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|
func (lc *LightChain) GetHeaderByNumber(number uint64) *types.Header {
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|
return lc.hc.GetHeaderByNumber(number)
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|
}
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|
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|
// GetHeaderByNumberOdr retrieves a block header from the database or network
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|
// by number, caching it (associated with its hash) if found.
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|
func (lc *LightChain) GetHeaderByNumberOdr(ctx context.Context, number uint64) (*types.Header, error) {
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|
if header := lc.hc.GetHeaderByNumber(number); header != nil {
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|
return header, nil
|
|
}
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|
return GetHeaderByNumber(ctx, lc.odr, number)
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|
}
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|
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|
// Config retrieves the header chain's chain configuration.
|
|
func (lc *LightChain) Config() *params.ChainConfig { return lc.hc.Config() }
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|
|
|
// LockChain locks the chain mutex for reading so that multiple canonical hashes can be
|
|
// retrieved while it is guaranteed that they belong to the same version of the chain
|
|
func (lc *LightChain) LockChain() {
|
|
lc.chainmu.RLock()
|
|
}
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|
|
|
// UnlockChain unlocks the chain mutex
|
|
func (lc *LightChain) UnlockChain() {
|
|
lc.chainmu.RUnlock()
|
|
}
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|
|
|
// SubscribeChainEvent registers a subscription of ChainEvent.
|
|
func (lc *LightChain) SubscribeChainEvent(ch chan<- core.ChainEvent) event.Subscription {
|
|
return lc.scope.Track(lc.chainFeed.Subscribe(ch))
|
|
}
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|
|
|
// SubscribeChainHeadEvent registers a subscription of ChainHeadEvent.
|
|
func (lc *LightChain) SubscribeChainHeadEvent(ch chan<- core.ChainHeadEvent) event.Subscription {
|
|
return lc.scope.Track(lc.chainHeadFeed.Subscribe(ch))
|
|
}
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|
|
|
// SubscribeChainSideEvent registers a subscription of ChainSideEvent.
|
|
func (lc *LightChain) SubscribeChainSideEvent(ch chan<- core.ChainSideEvent) event.Subscription {
|
|
return lc.scope.Track(lc.chainSideFeed.Subscribe(ch))
|
|
}
|
|
|
|
// SubscribeLogsEvent implements the interface of filters.Backend
|
|
// LightChain does not send logs events, so return an empty subscription.
|
|
func (lc *LightChain) SubscribeLogsEvent(ch chan<- []*types.Log) event.Subscription {
|
|
return lc.scope.Track(new(event.Feed).Subscribe(ch))
|
|
}
|
|
|
|
// SubscribeRemovedLogsEvent implements the interface of filters.Backend
|
|
// LightChain does not send core.RemovedLogsEvent, so return an empty subscription.
|
|
func (lc *LightChain) SubscribeRemovedLogsEvent(ch chan<- core.RemovedLogsEvent) event.Subscription {
|
|
return lc.scope.Track(new(event.Feed).Subscribe(ch))
|
|
}
|
|
|
|
// DisableCheckFreq disables header validation. This is used for ultralight mode.
|
|
func (lc *LightChain) DisableCheckFreq() {
|
|
lc.disableCheckFreq.Store(true)
|
|
}
|
|
|
|
// EnableCheckFreq enables header validation.
|
|
func (lc *LightChain) EnableCheckFreq() {
|
|
lc.disableCheckFreq.Store(false)
|
|
}
|
|
|