// Copyright 2014 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 core implements the Ethereum consensus protocol.
package core
import (
"errors"
"fmt"
"io"
"math/big"
"sync"
"sync/atomic"
"time"
"github.com/ethereum/go-ethereum/common"
"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/logger"
"github.com/ethereum/go-ethereum/logger/glog"
"github.com/ethereum/go-ethereum/metrics"
"github.com/ethereum/go-ethereum/pow"
"github.com/ethereum/go-ethereum/rlp"
"github.com/hashicorp/golang-lru"
)
var (
chainlogger = logger.NewLogger("CHAIN")
jsonlogger = logger.NewJsonLogger()
blockInsertTimer = metrics.NewTimer("chain/inserts")
ErrNoGenesis = errors.New("Genesis not found in chain")
)
const (
headerCacheLimit = 512
bodyCacheLimit = 256
tdCacheLimit = 1024
blockCacheLimit = 256
maxFutureBlocks = 256
maxTimeFutureBlocks = 30
checkpointLimit = 200
)
type ChainManager struct {
//eth EthManager
chainDb ethdb.Database
processor types.BlockProcessor
eventMux *event.TypeMux
genesisBlock *types.Block
// Last known total difficulty
mu sync.RWMutex
chainmu sync.RWMutex
tsmu sync.RWMutex
checkpoint int // checkpoint counts towards the new checkpoint
td *big.Int
currentBlock *types.Block
currentGasLimit *big.Int
headerCache *lru.Cache // Cache for the most recent block headers
bodyCache *lru.Cache // Cache for the most recent block bodies
bodyRLPCache *lru.Cache // Cache for the most recent block bodies in RLP encoded format
tdCache *lru.Cache // Cache for the most recent block total difficulties
blockCache *lru.Cache // Cache for the most recent entire blocks
futureBlocks *lru.Cache // future blocks are blocks added for later processing
quit chan struct{}
running int32 // running must be called automically
// procInterrupt must be atomically called
procInterrupt int32 // interrupt signaler for block processing
wg sync.WaitGroup
pow pow.PoW
}
func NewChainManager(chainDb ethdb.Database, pow pow.PoW, mux *event.TypeMux) (*ChainManager, error) {
headerCache, _ := lru.New(headerCacheLimit)
bodyCache, _ := lru.New(bodyCacheLimit)
bodyRLPCache, _ := lru.New(bodyCacheLimit)
tdCache, _ := lru.New(tdCacheLimit)
blockCache, _ := lru.New(blockCacheLimit)
futureBlocks, _ := lru.New(maxFutureBlocks)
bc := &ChainManager{
chainDb: chainDb,
eventMux: mux,
quit: make(chan struct{}),
headerCache: headerCache,
bodyCache: bodyCache,
bodyRLPCache: bodyRLPCache,
tdCache: tdCache,
blockCache: blockCache,
futureBlocks: futureBlocks,
pow: pow,
}
bc.genesisBlock = bc.GetBlockByNumber(0)
if bc.genesisBlock == nil {
reader, err := NewDefaultGenesisReader()
if err != nil {
return nil, err
}
bc.genesisBlock, err = WriteGenesisBlock(chainDb, reader)
if err != nil {
return nil, err
}
glog.V(logger.Info).Infoln("WARNING: Wrote default ethereum genesis block")
}
if err := bc.setLastState(); 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 BadHashes {
if block := bc.GetBlock(hash); block != nil {
glog.V(logger.Error).Infof("Found bad hash. Reorganising chain to state %x\n", block.ParentHash().Bytes()[:4])
block = bc.GetBlock(block.ParentHash())
if block == nil {
glog.Fatal("Unable to complete. Parent block not found. Corrupted DB?")
}
bc.SetHead(block)
glog.V(logger.Error).Infoln("Chain reorg was successfull. Resuming normal operation")
}
}
// Take ownership of this particular state
go bc.update()
return bc, nil
}
func (bc *ChainManager) SetHead(head *types.Block) {
bc.mu.Lock()
defer bc.mu.Unlock()
for block := bc.currentBlock; block != nil && block.Hash() != head.Hash(); block = bc.GetBlock(block.ParentHash()) {
DeleteBlock(bc.chainDb, block.Hash())
}
bc.headerCache.Purge()
bc.bodyCache.Purge()
bc.bodyRLPCache.Purge()
bc.blockCache.Purge()
bc.futureBlocks.Purge()
bc.currentBlock = head
bc.setTotalDifficulty(bc.GetTd(head.Hash()))
bc.insert(head)
bc.setLastState()
}
func (self *ChainManager) Td() *big.Int {
self.mu.RLock()
defer self.mu.RUnlock()
return new(big.Int).Set(self.td)
}
func (self *ChainManager) GasLimit() *big.Int {
self.mu.RLock()
defer self.mu.RUnlock()
return self.currentBlock.GasLimit()
}
func (self *ChainManager) LastBlockHash() common.Hash {
self.mu.RLock()
defer self.mu.RUnlock()
return self.currentBlock.Hash()
}
func (self *ChainManager) CurrentBlock() *types.Block {
self.mu.RLock()
defer self.mu.RUnlock()
return self.currentBlock
}
func (self *ChainManager) Status() (td *big.Int, currentBlock common.Hash, genesisBlock common.Hash) {
self.mu.RLock()
defer self.mu.RUnlock()
return new(big.Int).Set(self.td), self.currentBlock.Hash(), self.genesisBlock.Hash()
}
func (self *ChainManager) SetProcessor(proc types.BlockProcessor) {
self.processor = proc
}
func (self *ChainManager) State() *state.StateDB {
return state.New(self.CurrentBlock().Root(), self.chainDb)
}
func (bc *ChainManager) recover() bool {
data, _ := bc.chainDb.Get([]byte("checkpoint"))
if len(data) != 0 {
block := bc.GetBlock(common.BytesToHash(data))
if block != nil {
if err := WriteCanonicalHash(bc.chainDb, block.Hash(), block.NumberU64()); err != nil {
glog.Fatalf("failed to write database head number: %v", err)
}
if err := WriteHeadBlockHash(bc.chainDb, block.Hash()); err != nil {
glog.Fatalf("failed to write database head hash: %v", err)
}
bc.currentBlock = block
return true
}
}
return false
}
func (bc *ChainManager) setLastState() error {
head := GetHeadBlockHash(bc.chainDb)
if head != (common.Hash{}) {
block := bc.GetBlock(head)
if block != nil {
bc.currentBlock = block
} else {
glog.Infof("LastBlock (%x) not found. Recovering...\n", head)
if bc.recover() {
glog.Infof("Recover successful")
} else {
glog.Fatalf("Recover failed. Please report")
}
}
} else {
bc.Reset()
}
bc.td = bc.GetTd(bc.currentBlock.Hash())
bc.currentGasLimit = CalcGasLimit(bc.currentBlock)
if glog.V(logger.Info) {
glog.Infof("Last block (#%v) %x TD=%v\n", bc.currentBlock.Number(), bc.currentBlock.Hash(), bc.td)
}
return nil
}
// Reset purges the entire blockchain, restoring it to its genesis state.
func (bc *ChainManager) Reset() {
bc.ResetWithGenesisBlock(bc.genesisBlock)
}
// ResetWithGenesisBlock purges the entire blockchain, restoring it to the
// specified genesis state.
func (bc *ChainManager) ResetWithGenesisBlock(genesis *types.Block) {
bc.mu.Lock()
defer bc.mu.Unlock()
// Dump the entire block chain and purge the caches
for block := bc.currentBlock; block != nil; block = bc.GetBlock(block.ParentHash()) {
DeleteBlock(bc.chainDb, block.Hash())
}
bc.headerCache.Purge()
bc.bodyCache.Purge()
bc.bodyRLPCache.Purge()
bc.blockCache.Purge()
bc.futureBlocks.Purge()
// Prepare the genesis block and reinitialize the chain
if err := WriteTd(bc.chainDb, genesis.Hash(), genesis.Difficulty()); err != nil {
glog.Fatalf("failed to write genesis block TD: %v", err)
}
if err := WriteBlock(bc.chainDb, genesis); err != nil {
glog.Fatalf("failed to write genesis block: %v", err)
}
bc.insert(bc.genesisBlock)
bc.currentBlock = bc.genesisBlock
bc.setTotalDifficulty(genesis.Difficulty())
}
// Export writes the active chain to the given writer.
func (self *ChainManager) Export(w io.Writer) error {
if err := self.ExportN(w, uint64(0), self.currentBlock.NumberU64()); err != nil {
return err
}
return nil
}
// ExportN writes a subset of the active chain to the given writer.
func (self *ChainManager) ExportN(w io.Writer, first uint64, last uint64) error {
self.mu.RLock()
defer self.mu.RUnlock()
if first > last {
return fmt.Errorf("export failed: first (%d) is greater than last (%d)", first, last)
}
glog.V(logger.Info).Infof("exporting %d blocks...\n", last-first+1)
for nr := first; nr <= last; nr++ {
block := self.GetBlockByNumber(nr)
if block == nil {
return fmt.Errorf("export failed on #%d: not found", nr)
}
if err := block.EncodeRLP(w); err != nil {
return err
}
}
return nil
}
// insert injects a block into the current chain block chain. Note, this function
// assumes that the `mu` mutex is held!
func (bc *ChainManager) insert(block *types.Block) {
// Add the block to the canonical chain number scheme and mark as the head
if err := WriteCanonicalHash(bc.chainDb, block.Hash(), block.NumberU64()); err != nil {
glog.Fatalf("failed to insert block number: %v", err)
}
if err := WriteHeadBlockHash(bc.chainDb, block.Hash()); err != nil {
glog.Fatalf("failed to insert block number: %v", err)
}
// Add a new restore point if we reached some limit
bc.checkpoint++
if bc.checkpoint > checkpointLimit {
if err := bc.chainDb.Put([]byte("checkpoint"), block.Hash().Bytes()); err != nil {
glog.Fatalf("failed to create checkpoint: %v", err)
}
bc.checkpoint = 0
}
// Update the internal internal state with the head block
bc.currentBlock = block
}
// Accessors
func (bc *ChainManager) Genesis() *types.Block {
return bc.genesisBlock
}
// HasHeader checks if a block header is present in the database or not, caching
// it if present.
func (bc *ChainManager) HasHeader(hash common.Hash) bool {
return bc.GetHeader(hash) != nil
}
// GetHeader retrieves a block header from the database by hash, caching it if
// found.
func (self *ChainManager) GetHeader(hash common.Hash) *types.Header {
// Short circuit if the header's already in the cache, retrieve otherwise
if header, ok := self.headerCache.Get(hash); ok {
return header.(*types.Header)
}
header := GetHeader(self.chainDb, hash)
if header == nil {
return nil
}
// Cache the found header for next time and return
self.headerCache.Add(header.Hash(), header)
return header
}
// GetHeaderByNumber retrieves a block header from the database by number,
// caching it (associated with its hash) if found.
func (self *ChainManager) GetHeaderByNumber(number uint64) *types.Header {
hash := GetCanonicalHash(self.chainDb, number)
if hash == (common.Hash{}) {
return nil
}
return self.GetHeader(hash)
}
// GetBody retrieves a block body (transactions and uncles) from the database by
// hash, caching it if found.
func (self *ChainManager) GetBody(hash common.Hash) *types.Body {
// Short circuit if the body's already in the cache, retrieve otherwise
if cached, ok := self.bodyCache.Get(hash); ok {
body := cached.(*types.Body)
return body
}
body := GetBody(self.chainDb, hash)
if body == nil {
return nil
}
// Cache the found body for next time and return
self.bodyCache.Add(hash, body)
return body
}
// GetBodyRLP retrieves a block body in RLP encoding from the database by hash,
// caching it if found.
func (self *ChainManager) GetBodyRLP(hash common.Hash) rlp.RawValue {
// Short circuit if the body's already in the cache, retrieve otherwise
if cached, ok := self.bodyRLPCache.Get(hash); ok {
return cached.(rlp.RawValue)
}
body := GetBodyRLP(self.chainDb, hash)
if len(body) == 0 {
return nil
}
// Cache the found body for next time and return
self.bodyRLPCache.Add(hash, body)
return body
}
// GetTd retrieves a block's total difficulty in the canonical chain from the
// database by hash, caching it if found.
func (self *ChainManager) GetTd(hash common.Hash) *big.Int {
// Short circuit if the td's already in the cache, retrieve otherwise
if cached, ok := self.tdCache.Get(hash); ok {
return cached.(*big.Int)
}
td := GetTd(self.chainDb, hash)
if td == nil {
return nil
}
// Cache the found body for next time and return
self.tdCache.Add(hash, td)
return td
}
// HasBlock checks if a block is fully present in the database or not, caching
// it if present.
func (bc *ChainManager) HasBlock(hash common.Hash) bool {
return bc.GetBlock(hash) != nil
}
// GetBlock retrieves a block from the database by hash, caching it if found.
func (self *ChainManager) GetBlock(hash common.Hash) *types.Block {
// Short circuit if the block's already in the cache, retrieve otherwise
if block, ok := self.blockCache.Get(hash); ok {
return block.(*types.Block)
}
block := GetBlock(self.chainDb, hash)
if block == nil {
return nil
}
// Cache the found block for next time and return
self.blockCache.Add(block.Hash(), block)
return block
}
// GetBlockByNumber retrieves a block from the database by number, caching it
// (associated with its hash) if found.
func (self *ChainManager) GetBlockByNumber(number uint64) *types.Block {
hash := GetCanonicalHash(self.chainDb, number)
if hash == (common.Hash{}) {
return nil
}
return self.GetBlock(hash)
}
// GetBlockHashesFromHash retrieves a number of block hashes starting at a given
// hash, fetching towards the genesis block.
func (self *ChainManager) GetBlockHashesFromHash(hash common.Hash, max uint64) []common.Hash {
// Get the origin header from which to fetch
header := self.GetHeader(hash)
if header == nil {
return nil
}
// Iterate the headers until enough is collected or the genesis reached
chain := make([]common.Hash, 0, max)
for i := uint64(0); i < max; i++ {
if header = self.GetHeader(header.ParentHash); header == nil {
break
}
chain = append(chain, header.Hash())
if header.Number.Cmp(common.Big0) == 0 {
break
}
}
return chain
}
// [deprecated by eth/62]
// GetBlocksFromHash returns the block corresponding to hash and up to n-1 ancestors.
func (self *ChainManager) GetBlocksFromHash(hash common.Hash, n int) (blocks []*types.Block) {
for i := 0; i < n; i++ {
block := self.GetBlock(hash)
if block == nil {
break
}
blocks = append(blocks, block)
hash = block.ParentHash()
}
return
}
func (self *ChainManager) GetUnclesInChain(block *types.Block, length int) (uncles []*types.Header) {
for i := 0; block != nil && i < length; i++ {
uncles = append(uncles, block.Uncles()...)
block = self.GetBlock(block.ParentHash())
}
return
}
// setTotalDifficulty updates the TD of the chain manager. Note, this function
// assumes that the `mu` mutex is held!
func (bc *ChainManager) setTotalDifficulty(td *big.Int) {
bc.td = new(big.Int).Set(td)
}
func (bc *ChainManager) Stop() {
if !atomic.CompareAndSwapInt32(&bc.running, 0, 1) {
return
}
close(bc.quit)
atomic.StoreInt32(&bc.procInterrupt, 1)
bc.wg.Wait()
glog.V(logger.Info).Infoln("Chain manager stopped")
}
type queueEvent struct {
queue []interface{}
canonicalCount int
sideCount int
splitCount int
}
func (self *ChainManager) procFutureBlocks() {
blocks := make([]*types.Block, self.futureBlocks.Len())
for i, hash := range self.futureBlocks.Keys() {
block, _ := self.futureBlocks.Get(hash)
blocks[i] = block.(*types.Block)
}
if len(blocks) > 0 {
types.BlockBy(types.Number).Sort(blocks)
self.InsertChain(blocks)
}
}
type writeStatus byte
const (
NonStatTy writeStatus = iota
CanonStatTy
SplitStatTy
SideStatTy
)
// WriteBlock writes the block to the chain.
func (self *ChainManager) WriteBlock(block *types.Block) (status writeStatus, err error) {
self.wg.Add(1)
defer self.wg.Done()
// Calculate the total difficulty of the block
ptd := self.GetTd(block.ParentHash())
if ptd == nil {
return NonStatTy, ParentError(block.ParentHash())
}
td := new(big.Int).Add(block.Difficulty(), ptd)
self.mu.RLock()
cblock := self.currentBlock
self.mu.RUnlock()
// Compare the TD of the last known block in the canonical chain to make sure it's greater.
// At this point it's possible that a different chain (fork) becomes the new canonical chain.
if td.Cmp(self.Td()) > 0 {
// chain fork
if block.ParentHash() != cblock.Hash() {
// during split we merge two different chains and create the new canonical chain
err := self.reorg(cblock, block)
if err != nil {
return NonStatTy, err
}
}
status = CanonStatTy
self.mu.Lock()
self.setTotalDifficulty(td)
self.insert(block)
self.mu.Unlock()
} else {
status = SideStatTy
}
if err := WriteTd(self.chainDb, block.Hash(), td); err != nil {
glog.Fatalf("failed to write block total difficulty: %v", err)
}
if err := WriteBlock(self.chainDb, block); err != nil {
glog.Fatalf("filed to write block contents: %v", err)
}
// Delete from future blocks
self.futureBlocks.Remove(block.Hash())
return
}
// InsertChain will attempt to insert the given chain in to the canonical chain or, otherwise, create a fork. It an error is returned
// it will return the index number of the failing block as well an error describing what went wrong (for possible errors see core/errors.go).
func (self *ChainManager) InsertChain(chain types.Blocks) (int, error) {
self.wg.Add(1)
defer self.wg.Done()
self.chainmu.Lock()
defer self.chainmu.Unlock()
// A queued approach to delivering events. This is generally
// faster than direct delivery and requires much less mutex
// acquiring.
var (
queue = make([]interface{}, len(chain))
queueEvent = queueEvent{queue: queue}
stats struct{ queued, processed, ignored int }
tstart = time.Now()
nonceChecked = make([]bool, len(chain))
)
// Start the parallel nonce verifier.
nonceAbort, nonceResults := verifyNoncesFromBlocks(self.pow, chain)
defer close(nonceAbort)
txcount := 0
for i, block := range chain {
if atomic.LoadInt32(&self.procInterrupt) == 1 {
glog.V(logger.Debug).Infoln("Premature abort during chain processing")
break
}
bstart := time.Now()
// Wait for block i's nonce to be verified before processing
// its state transition.
for !nonceChecked[i] {
r := <-nonceResults
nonceChecked[r.index] = true
if !r.valid {
block := chain[r.index]
return r.index, &BlockNonceErr{Hash: block.Hash(), Number: block.Number(), Nonce: block.Nonce()}
}
}
if BadHashes[block.Hash()] {
err := fmt.Errorf("Found known bad hash in chain %x", block.Hash())
blockErr(block, err)
return i, err
}
// Call in to the block processor and check for errors. It's likely that if one block fails
// all others will fail too (unless a known block is returned).
logs, receipts, err := self.processor.Process(block)
if err != nil {
if IsKnownBlockErr(err) {
stats.ignored++
continue
}
if err == BlockFutureErr {
// Allow up to MaxFuture second in the future blocks. If this limit
// is exceeded the chain is discarded and processed at a later time
// if given.
max := big.NewInt(time.Now().Unix() + maxTimeFutureBlocks)
if block.Time().Cmp(max) == 1 {
return i, fmt.Errorf("%v: BlockFutureErr, %v > %v", BlockFutureErr, block.Time(), max)
}
self.futureBlocks.Add(block.Hash(), block)
stats.queued++
continue
}
if IsParentErr(err) && self.futureBlocks.Contains(block.ParentHash()) {
self.futureBlocks.Add(block.Hash(), block)
stats.queued++
continue
}
blockErr(block, err)
go ReportBlock(block, err)
return i, err
}
if err := PutBlockReceipts(self.chainDb, block, receipts); err != nil {
glog.V(logger.Warn).Infoln("error writing block receipts:", err)
}
txcount += len(block.Transactions())
// write the block to the chain and get the status
status, err := self.WriteBlock(block)
if err != nil {
return i, err
}
switch status {
case CanonStatTy:
if glog.V(logger.Debug) {
glog.Infof("[%v] inserted block #%d (%d TXs %v G %d UNCs) (%x...). Took %v\n", time.Now().UnixNano(), block.Number(), len(block.Transactions()), block.GasUsed(), len(block.Uncles()), block.Hash().Bytes()[0:4], time.Since(bstart))
}
queue[i] = ChainEvent{block, block.Hash(), logs}
queueEvent.canonicalCount++
// This puts transactions in a extra db for rpc
PutTransactions(self.chainDb, block, block.Transactions())
// store the receipts
PutReceipts(self.chainDb, receipts)
case SideStatTy:
if glog.V(logger.Detail) {
glog.Infof("inserted forked block #%d (TD=%v) (%d TXs %d UNCs) (%x...). Took %v\n", block.Number(), block.Difficulty(), len(block.Transactions()), len(block.Uncles()), block.Hash().Bytes()[0:4], time.Since(bstart))
}
queue[i] = ChainSideEvent{block, logs}
queueEvent.sideCount++
case SplitStatTy:
queue[i] = ChainSplitEvent{block, logs}
queueEvent.splitCount++
}
stats.processed++
}
if (stats.queued > 0 || stats.processed > 0 || stats.ignored > 0) && bool(glog.V(logger.Info)) {
tend := time.Since(tstart)
start, end := chain[0], chain[len(chain)-1]
glog.Infof("imported %d block(s) (%d queued %d ignored) including %d txs in %v. #%v [%x / %x]\n", stats.processed, stats.queued, stats.ignored, txcount, tend, end.Number(), start.Hash().Bytes()[:4], end.Hash().Bytes()[:4])
}
go self.eventMux.Post(queueEvent)
return 0, nil
}
// reorgs takes two blocks, an old chain and a new chain and will reconstruct the blocks and inserts them
// to be part of the new canonical chain and accumulates potential missing transactions and post an
// event about them
func (self *ChainManager) reorg(oldBlock, newBlock *types.Block) error {
self.mu.Lock()
defer self.mu.Unlock()
var (
newChain types.Blocks
commonBlock *types.Block
oldStart = oldBlock
newStart = newBlock
deletedTxs types.Transactions
)
// first reduce whoever is higher bound
if oldBlock.NumberU64() > newBlock.NumberU64() {
// reduce old chain
for oldBlock = oldBlock; oldBlock != nil && oldBlock.NumberU64() != newBlock.NumberU64(); oldBlock = self.GetBlock(oldBlock.ParentHash()) {
deletedTxs = append(deletedTxs, oldBlock.Transactions()...)
}
} else {
// reduce new chain and append new chain blocks for inserting later on
for newBlock = newBlock; newBlock != nil && newBlock.NumberU64() != oldBlock.NumberU64(); newBlock = self.GetBlock(newBlock.ParentHash()) {
newChain = append(newChain, newBlock)
}
}
if oldBlock == nil {
return fmt.Errorf("Invalid old chain")
}
if newBlock == nil {
return fmt.Errorf("Invalid new chain")
}
numSplit := newBlock.Number()
for {
if oldBlock.Hash() == newBlock.Hash() {
commonBlock = oldBlock
break
}
newChain = append(newChain, newBlock)
deletedTxs = append(deletedTxs, oldBlock.Transactions()...)
oldBlock, newBlock = self.GetBlock(oldBlock.ParentHash()), self.GetBlock(newBlock.ParentHash())
if oldBlock == nil {
return fmt.Errorf("Invalid old chain")
}
if newBlock == nil {
return fmt.Errorf("Invalid new chain")
}
}
if glog.V(logger.Debug) {
commonHash := commonBlock.Hash()
glog.Infof("Chain split detected @ %x. Reorganising chain from #%v %x to %x", commonHash[:4], numSplit, oldStart.Hash().Bytes()[:4], newStart.Hash().Bytes()[:4])
}
var addedTxs types.Transactions
// insert blocks. Order does not matter. Last block will be written in ImportChain itself which creates the new head properly
for _, block := range newChain {
// insert the block in the canonical way, re-writing history
self.insert(block)
// write canonical receipts and transactions
PutTransactions(self.chainDb, block, block.Transactions())
PutReceipts(self.chainDb, GetBlockReceipts(self.chainDb, block.Hash()))
addedTxs = append(addedTxs, block.Transactions()...)
}
// calculate the difference between deleted and added transactions
diff := types.TxDifference(deletedTxs, addedTxs)
// When transactions get deleted from the database that means the
// receipts that were created in the fork must also be deleted
for _, tx := range diff {
DeleteReceipt(self.chainDb, tx.Hash())
DeleteTransaction(self.chainDb, tx.Hash())
}
self.eventMux.Post(RemovedTransactionEvent{diff})
return nil
}
func (self *ChainManager) update() {
events := self.eventMux.Subscribe(queueEvent{})
futureTimer := time.Tick(5 * time.Second)
out:
for {
select {
case ev := <-events.Chan():
switch ev := ev.(type) {
case queueEvent:
for _, event := range ev.queue {
switch event := event.(type) {
case ChainEvent:
// We need some control over the mining operation. Acquiring locks and waiting for the miner to create new block takes too long
// and in most cases isn't even necessary.
if self.currentBlock.Hash() == event.Hash {
self.currentGasLimit = CalcGasLimit(event.Block)
self.eventMux.Post(ChainHeadEvent{event.Block})
}
}
self.eventMux.Post(event)
}
}
case <-futureTimer:
self.procFutureBlocks()
case <-self.quit:
break out
}
}
}
func blockErr(block *types.Block, err error) {
h := block.Header()
glog.V(logger.Error).Infof("Bad block #%v (%x)\n", h.Number, h.Hash().Bytes())
glog.V(logger.Error).Infoln(err)
glog.V(logger.Debug).Infoln(verifyNonces)
}