// 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 *BlockChain) 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 (
stats struct{ queued, processed, ignored int }
events = make([]interface{}, 0, len(chain))
coalescedLogs vm.Logs
tstart = time.Now()
nonceChecked = make([]bool, len(chain))
statedb *state.StateDB
)
// 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 block 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 := BadHashError(block.Hash())
reportBlock(block, err)
return i, err
}
// Stage 1 validation of the block using the chain's validator
// interface.
err := self.Validator().ValidateBlock(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
}
reportBlock(block, err)
return i, err
}
// Create a new statedb using the parent block and report an
// error if it fails.
if statedb == nil {
statedb, err = state.New(self.GetBlock(block.ParentHash()).Root(), self.chainDb)
} else {
err = statedb.Reset(chain[i-1].Root())
}
if err != nil {
reportBlock(block, err)
return i, err
}
// Process block using the parent state as reference point.
receipts, logs, usedGas, err := self.processor.Process(block, statedb, self.config.VmConfig)
if err != nil {
reportBlock(block, err)
return i, err
}
// Validate the state using the default validator
err = self.Validator().ValidateState(block, self.GetBlock(block.ParentHash()), statedb, receipts, usedGas)
if err != nil {
reportBlock(block, err)
return i, err
}
// Write state changes to database
_, err = statedb.Commit()
if err != nil {
return i, err
}
// coalesce logs for later processing
coalescedLogs = append(coalescedLogs, logs...)
if err := WriteBlockReceipts(self.chainDb, block.Hash(), receipts); err != nil {
return i, 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))
}
events = append(events, ChainEvent{block, block.Hash(), logs})
// This puts transactions in a extra db for rpc
if err := WriteTransactions(self.chainDb, block); err != nil {
return i, err
}
// store the receipts
if err := WriteReceipts(self.chainDb, receipts); err != nil {
return i, err
}
// Write map map bloom filters
if err := WriteMipmapBloom(self.chainDb, block.NumberU64(), receipts); err != nil {
return i, err
}
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))
}
events = append(events, ChainSideEvent{block, logs})
case SplitStatTy:
events = append(events, ChainSplitEvent{block, logs})
}
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.postChainEvents(events, coalescedLogs)
return 0, nil
}