• Martin Holst Swende's avatar
    all: simplify timestamps to uint64 (#19372) · 0b4fe8d1
    Martin Holst Swende authored
    * all: simplify timestamps to uint64
    
    * tests: update definitions
    
    * clef, faucet, mobile: leftover uint64 fixups
    
    * ethash: fix tests
    
    * graphql: update schema for timestamp
    
    * ethash: remove unused variable
    0b4fe8d1
lightchain.go 18.7 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542
// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

// Package light implements on-demand retrieval capable state and chain objects
// for the Ethereum Light Client.
package light

import (
	"context"
	"errors"
	"math/big"
	"sync"
	"sync/atomic"
	"time"

	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/consensus"
	"github.com/ethereum/go-ethereum/core"
	"github.com/ethereum/go-ethereum/core/rawdb"
	"github.com/ethereum/go-ethereum/core/state"
	"github.com/ethereum/go-ethereum/core/types"
	"github.com/ethereum/go-ethereum/ethdb"
	"github.com/ethereum/go-ethereum/event"
	"github.com/ethereum/go-ethereum/log"
	"github.com/ethereum/go-ethereum/params"
	"github.com/ethereum/go-ethereum/rlp"
	lru "github.com/hashicorp/golang-lru"
)

var (
	bodyCacheLimit  = 256
	blockCacheLimit = 256
)

// LightChain represents a canonical chain that by default only handles block
// headers, downloading block bodies and receipts on demand through an ODR
// interface. It only does header validation during chain insertion.
type LightChain struct {
	hc            *core.HeaderChain
	indexerConfig *IndexerConfig
	chainDb       ethdb.Database
	engine        consensus.Engine
	odr           OdrBackend
	chainFeed     event.Feed
	chainSideFeed event.Feed
	chainHeadFeed event.Feed
	scope         event.SubscriptionScope
	genesisBlock  *types.Block

	bodyCache    *lru.Cache // Cache for the most recent block bodies
	bodyRLPCache *lru.Cache // Cache for the most recent block bodies in RLP encoded format
	blockCache   *lru.Cache // Cache for the most recent entire blocks

	chainmu sync.RWMutex // protects header inserts
	quit    chan struct{}
	wg      sync.WaitGroup

	// Atomic boolean switches:
	running          int32 // whether LightChain is running or stopped
	procInterrupt    int32 // interrupts chain insert
	disableCheckFreq int32 // disables header verification
}

// NewLightChain returns a fully initialised light chain using information
// available in the database. It initialises the default Ethereum header
// validator.
func NewLightChain(odr OdrBackend, config *params.ChainConfig, engine consensus.Engine) (*LightChain, error) {
	bodyCache, _ := lru.New(bodyCacheLimit)
	bodyRLPCache, _ := lru.New(bodyCacheLimit)
	blockCache, _ := lru.New(blockCacheLimit)

	bc := &LightChain{
		chainDb:       odr.Database(),
		indexerConfig: odr.IndexerConfig(),
		odr:           odr,
		quit:          make(chan struct{}),
		bodyCache:     bodyCache,
		bodyRLPCache:  bodyRLPCache,
		blockCache:    blockCache,
		engine:        engine,
	}
	var err error
	bc.hc, err = core.NewHeaderChain(odr.Database(), config, bc.engine, bc.getProcInterrupt)
	if err != nil {
		return nil, err
	}
	bc.genesisBlock, _ = bc.GetBlockByNumber(NoOdr, 0)
	if bc.genesisBlock == nil {
		return nil, core.ErrNoGenesis
	}
	if cp, ok := trustedCheckpoints[bc.genesisBlock.Hash()]; ok {
		bc.addTrustedCheckpoint(cp)
	}
	if err := bc.loadLastState(); err != nil {
		return nil, err
	}
	// Check the current state of the block hashes and make sure that we do not have any of the bad blocks in our chain
	for hash := range core.BadHashes {
		if header := bc.GetHeaderByHash(hash); header != nil {
			log.Error("Found bad hash, rewinding chain", "number", header.Number, "hash", header.ParentHash)
			bc.SetHead(header.Number.Uint64() - 1)
			log.Error("Chain rewind was successful, resuming normal operation")
		}
	}
	return bc, nil
}

// addTrustedCheckpoint adds a trusted checkpoint to the blockchain
func (lc *LightChain) addTrustedCheckpoint(cp *params.TrustedCheckpoint) {
	if lc.odr.ChtIndexer() != nil {
		StoreChtRoot(lc.chainDb, cp.SectionIndex, cp.SectionHead, cp.CHTRoot)
		lc.odr.ChtIndexer().AddCheckpoint(cp.SectionIndex, cp.SectionHead)
	}
	if lc.odr.BloomTrieIndexer() != nil {
		StoreBloomTrieRoot(lc.chainDb, cp.SectionIndex, cp.SectionHead, cp.BloomRoot)
		lc.odr.BloomTrieIndexer().AddCheckpoint(cp.SectionIndex, cp.SectionHead)
	}
	if lc.odr.BloomIndexer() != nil {
		lc.odr.BloomIndexer().AddCheckpoint(cp.SectionIndex, cp.SectionHead)
	}
	log.Info("Added trusted checkpoint", "chain", cp.Name, "block", (cp.SectionIndex+1)*lc.indexerConfig.ChtSize-1, "hash", cp.SectionHead)
}

func (lc *LightChain) getProcInterrupt() bool {
	return atomic.LoadInt32(&lc.procInterrupt) == 1
}

// Odr returns the ODR backend of the chain
func (lc *LightChain) Odr() OdrBackend {
	return lc.odr
}

// loadLastState loads the last known chain state from the database. This method
// assumes that the chain manager mutex is held.
func (lc *LightChain) loadLastState() error {
	if head := rawdb.ReadHeadHeaderHash(lc.chainDb); head == (common.Hash{}) {
		// Corrupt or empty database, init from scratch
		lc.Reset()
	} else {
		if header := lc.GetHeaderByHash(head); header != nil {
			lc.hc.SetCurrentHeader(header)
		}
	}

	// Issue a status log and return
	header := lc.hc.CurrentHeader()
	headerTd := lc.GetTd(header.Hash(), header.Number.Uint64())
	log.Info("Loaded most recent local header", "number", header.Number, "hash", header.Hash(), "td", headerTd, "age", common.PrettyAge(time.Unix(int64(header.Time), 0)))

	return nil
}

// SetHead rewinds the local chain to a new head. Everything above the new
// head will be deleted and the new one set.
func (lc *LightChain) SetHead(head uint64) {
	lc.chainmu.Lock()
	defer lc.chainmu.Unlock()

	lc.hc.SetHead(head, nil)
	lc.loadLastState()
}

// GasLimit returns the gas limit of the current HEAD block.
func (lc *LightChain) GasLimit() uint64 {
	return lc.hc.CurrentHeader().GasLimit
}

// Reset purges the entire blockchain, restoring it to its genesis state.
func (lc *LightChain) Reset() {
	lc.ResetWithGenesisBlock(lc.genesisBlock)
}

// ResetWithGenesisBlock purges the entire blockchain, restoring it to the
// specified genesis state.
func (lc *LightChain) ResetWithGenesisBlock(genesis *types.Block) {
	// Dump the entire block chain and purge the caches
	lc.SetHead(0)

	lc.chainmu.Lock()
	defer lc.chainmu.Unlock()

	// Prepare the genesis block and reinitialise the chain
	rawdb.WriteTd(lc.chainDb, genesis.Hash(), genesis.NumberU64(), genesis.Difficulty())
	rawdb.WriteBlock(lc.chainDb, genesis)

	lc.genesisBlock = genesis
	lc.hc.SetGenesis(lc.genesisBlock.Header())
	lc.hc.SetCurrentHeader(lc.genesisBlock.Header())
}

// Accessors

// Engine retrieves the light chain's consensus engine.
func (lc *LightChain) Engine() consensus.Engine { return lc.engine }

// Genesis returns the genesis block
func (lc *LightChain) Genesis() *types.Block {
	return lc.genesisBlock
}

func (lc *LightChain) StateCache() state.Database {
	panic("not implemented")
}

// GetBody retrieves a block body (transactions and uncles) from the database
// or ODR service by hash, caching it if found.
func (lc *LightChain) GetBody(ctx context.Context, hash common.Hash) (*types.Body, error) {
	// Short circuit if the body's already in the cache, retrieve otherwise
	if cached, ok := lc.bodyCache.Get(hash); ok {
		body := cached.(*types.Body)
		return body, nil
	}
	number := lc.hc.GetBlockNumber(hash)
	if number == nil {
		return nil, errors.New("unknown block")
	}
	body, err := GetBody(ctx, lc.odr, hash, *number)
	if err != nil {
		return nil, err
	}
	// Cache the found body for next time and return
	lc.bodyCache.Add(hash, body)
	return body, nil
}

// GetBodyRLP retrieves a block body in RLP encoding from the database or
// ODR service by hash, caching it if found.
func (lc *LightChain) GetBodyRLP(ctx context.Context, hash common.Hash) (rlp.RawValue, error) {
	// Short circuit if the body's already in the cache, retrieve otherwise
	if cached, ok := lc.bodyRLPCache.Get(hash); ok {
		return cached.(rlp.RawValue), nil
	}
	number := lc.hc.GetBlockNumber(hash)
	if number == nil {
		return nil, errors.New("unknown block")
	}
	body, err := GetBodyRLP(ctx, lc.odr, hash, *number)
	if err != nil {
		return nil, err
	}
	// Cache the found body for next time and return
	lc.bodyRLPCache.Add(hash, body)
	return body, nil
}

// HasBlock checks if a block is fully present in the database or not, caching
// it if present.
func (lc *LightChain) HasBlock(hash common.Hash, number uint64) bool {
	blk, _ := lc.GetBlock(NoOdr, hash, number)
	return blk != nil
}

// GetBlock retrieves a block from the database or ODR service by hash and number,
// caching it if found.
func (lc *LightChain) GetBlock(ctx context.Context, hash common.Hash, number uint64) (*types.Block, error) {
	// Short circuit if the block's already in the cache, retrieve otherwise
	if block, ok := lc.blockCache.Get(hash); ok {
		return block.(*types.Block), nil
	}
	block, err := GetBlock(ctx, lc.odr, hash, number)
	if err != nil {
		return nil, err
	}
	// Cache the found block for next time and return
	lc.blockCache.Add(block.Hash(), block)
	return block, nil
}

// GetBlockByHash retrieves a block from the database or ODR service by hash,
// caching it if found.
func (lc *LightChain) GetBlockByHash(ctx context.Context, hash common.Hash) (*types.Block, error) {
	number := lc.hc.GetBlockNumber(hash)
	if number == nil {
		return nil, errors.New("unknown block")
	}
	return lc.GetBlock(ctx, hash, *number)
}

// GetBlockByNumber retrieves a block from the database or ODR service by
// number, caching it (associated with its hash) if found.
func (lc *LightChain) GetBlockByNumber(ctx context.Context, number uint64) (*types.Block, error) {
	hash, err := GetCanonicalHash(ctx, lc.odr, number)
	if hash == (common.Hash{}) || err != nil {
		return nil, err
	}
	return lc.GetBlock(ctx, hash, number)
}

// Stop stops the blockchain service. If any imports are currently in progress
// it will abort them using the procInterrupt.
func (lc *LightChain) Stop() {
	if !atomic.CompareAndSwapInt32(&lc.running, 0, 1) {
		return
	}
	close(lc.quit)
	atomic.StoreInt32(&lc.procInterrupt, 1)

	lc.wg.Wait()
	log.Info("Blockchain manager stopped")
}

// Rollback is designed to remove a chain of links from the database that aren't
// certain enough to be valid.
func (lc *LightChain) Rollback(chain []common.Hash) {
	lc.chainmu.Lock()
	defer lc.chainmu.Unlock()

	for i := len(chain) - 1; i >= 0; i-- {
		hash := chain[i]

		if head := lc.hc.CurrentHeader(); head.Hash() == hash {
			lc.hc.SetCurrentHeader(lc.GetHeader(head.ParentHash, head.Number.Uint64()-1))
		}
	}
}

// postChainEvents iterates over the events generated by a chain insertion and
// posts them into the event feed.
func (lc *LightChain) postChainEvents(events []interface{}) {
	for _, event := range events {
		switch ev := event.(type) {
		case core.ChainEvent:
			if lc.CurrentHeader().Hash() == ev.Hash {
				lc.chainHeadFeed.Send(core.ChainHeadEvent{Block: ev.Block})
			}
			lc.chainFeed.Send(ev)
		case core.ChainSideEvent:
			lc.chainSideFeed.Send(ev)
		}
	}
}

// InsertHeaderChain attempts to insert the given header chain in to the local
// chain, possibly creating a reorg. If an error is returned, it will return the
// index number of the failing header as well an error describing what went wrong.
//
// The verify parameter can be used to fine tune whether nonce verification
// should be done or not. The reason behind the optional check is because some
// of the header retrieval mechanisms already need to verfy nonces, as well as
// because nonces can be verified sparsely, not needing to check each.
//
// In the case of a light chain, InsertHeaderChain also creates and posts light
// chain events when necessary.
func (lc *LightChain) InsertHeaderChain(chain []*types.Header, checkFreq int) (int, error) {
	if atomic.LoadInt32(&lc.disableCheckFreq) == 1 {
		checkFreq = 0
	}
	start := time.Now()
	if i, err := lc.hc.ValidateHeaderChain(chain, checkFreq); err != nil {
		return i, err
	}

	// Make sure only one thread manipulates the chain at once
	lc.chainmu.Lock()
	defer lc.chainmu.Unlock()

	lc.wg.Add(1)
	defer lc.wg.Done()

	var events []interface{}
	whFunc := func(header *types.Header) error {
		status, err := lc.hc.WriteHeader(header)

		switch status {
		case core.CanonStatTy:
			log.Debug("Inserted new header", "number", header.Number, "hash", header.Hash())
			events = append(events, core.ChainEvent{Block: types.NewBlockWithHeader(header), Hash: header.Hash()})

		case core.SideStatTy:
			log.Debug("Inserted forked header", "number", header.Number, "hash", header.Hash())
			events = append(events, core.ChainSideEvent{Block: types.NewBlockWithHeader(header)})
		}
		return err
	}
	i, err := lc.hc.InsertHeaderChain(chain, whFunc, start)
	lc.postChainEvents(events)
	return i, err
}

// CurrentHeader retrieves the current head header of the canonical chain. The
// header is retrieved from the HeaderChain's internal cache.
func (lc *LightChain) CurrentHeader() *types.Header {
	return lc.hc.CurrentHeader()
}

// GetTd retrieves a block's total difficulty in the canonical chain from the
// database by hash and number, caching it if found.
func (lc *LightChain) GetTd(hash common.Hash, number uint64) *big.Int {
	return lc.hc.GetTd(hash, number)
}

// GetTdByHash retrieves a block's total difficulty in the canonical chain from the
// database by hash, caching it if found.
func (lc *LightChain) GetTdByHash(hash common.Hash) *big.Int {
	return lc.hc.GetTdByHash(hash)
}

// GetHeader retrieves a block header from the database by hash and number,
// caching it if found.
func (lc *LightChain) GetHeader(hash common.Hash, number uint64) *types.Header {
	return lc.hc.GetHeader(hash, number)
}

// GetHeaderByHash retrieves a block header from the database by hash, caching it if
// found.
func (lc *LightChain) GetHeaderByHash(hash common.Hash) *types.Header {
	return lc.hc.GetHeaderByHash(hash)
}

// HasHeader checks if a block header is present in the database or not, caching
// it if present.
func (lc *LightChain) HasHeader(hash common.Hash, number uint64) bool {
	return lc.hc.HasHeader(hash, number)
}

// GetBlockHashesFromHash retrieves a number of block hashes starting at a given
// hash, fetching towards the genesis block.
func (lc *LightChain) GetBlockHashesFromHash(hash common.Hash, max uint64) []common.Hash {
	return lc.hc.GetBlockHashesFromHash(hash, max)
}

// GetAncestor retrieves the Nth ancestor of a given block. It assumes that either the given block or
// a close ancestor of it is canonical. maxNonCanonical points to a downwards counter limiting the
// number of blocks to be individually checked before we reach the canonical chain.
//
// Note: ancestor == 0 returns the same block, 1 returns its parent and so on.
func (lc *LightChain) GetAncestor(hash common.Hash, number, ancestor uint64, maxNonCanonical *uint64) (common.Hash, uint64) {
	lc.chainmu.RLock()
	defer lc.chainmu.RUnlock()

	return lc.hc.GetAncestor(hash, number, ancestor, maxNonCanonical)
}

// GetHeaderByNumber retrieves a block header from the database by number,
// caching it (associated with its hash) if found.
func (lc *LightChain) GetHeaderByNumber(number uint64) *types.Header {
	return lc.hc.GetHeaderByNumber(number)
}

// GetHeaderByNumberOdr retrieves a block header from the database or network
// by number, caching it (associated with its hash) if found.
func (lc *LightChain) GetHeaderByNumberOdr(ctx context.Context, number uint64) (*types.Header, error) {
	if header := lc.hc.GetHeaderByNumber(number); header != nil {
		return header, nil
	}
	return GetHeaderByNumber(ctx, lc.odr, number)
}

// Config retrieves the header chain's chain configuration.
func (lc *LightChain) Config() *params.ChainConfig { return lc.hc.Config() }

func (lc *LightChain) SyncCht(ctx context.Context) bool {
	// If we don't have a CHT indexer, abort
	if lc.odr.ChtIndexer() == nil {
		return false
	}
	// Ensure the remote CHT head is ahead of us
	head := lc.CurrentHeader().Number.Uint64()
	sections, _, _ := lc.odr.ChtIndexer().Sections()

	latest := sections*lc.indexerConfig.ChtSize - 1
	if clique := lc.hc.Config().Clique; clique != nil {
		latest -= latest % clique.Epoch // epoch snapshot for clique
	}
	if head >= latest {
		return false
	}
	// Retrieve the latest useful header and update to it
	if header, err := GetHeaderByNumber(ctx, lc.odr, latest); header != nil && err == nil {
		lc.chainmu.Lock()
		defer lc.chainmu.Unlock()

		// Ensure the chain didn't move past the latest block while retrieving it
		if lc.hc.CurrentHeader().Number.Uint64() < header.Number.Uint64() {
			log.Info("Updated latest header based on CHT", "number", header.Number, "hash", header.Hash(), "age", common.PrettyAge(time.Unix(int64(header.Time), 0)))
			lc.hc.SetCurrentHeader(header)
		}
		return true
	}
	return false
}

// 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()
}

// UnlockChain unlocks the chain mutex
func (lc *LightChain) UnlockChain() {
	lc.chainmu.RUnlock()
}

// SubscribeChainEvent registers a subscription of ChainEvent.
func (lc *LightChain) SubscribeChainEvent(ch chan<- core.ChainEvent) event.Subscription {
	return lc.scope.Track(lc.chainFeed.Subscribe(ch))
}

// SubscribeChainHeadEvent registers a subscription of ChainHeadEvent.
func (lc *LightChain) SubscribeChainHeadEvent(ch chan<- core.ChainHeadEvent) event.Subscription {
	return lc.scope.Track(lc.chainHeadFeed.Subscribe(ch))
}

// 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() {
	atomic.StoreInt32(&lc.disableCheckFreq, 1)
}

// EnableCheckFreq enables header validation.
func (lc *LightChain) EnableCheckFreq() {
	atomic.StoreInt32(&lc.disableCheckFreq, 0)
}