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core, eth, rpc: split out block validator and state processor

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This removes the burden on a single object to take care of all
validation and state processing. Now instead the validation is done by
the `core.BlockValidator` (`types.Validator`) that takes care of both
header and uncle validation through the `ValidateBlock` method and state
validation through the `ValidateState` method. The state processing is
done by a new object `core.StateProcessor` (`types.Processor`) and
accepts a new state as input and uses that to process the given block's
transactions (and uncles for rewords) to calculate the state root for
the next block (P_n + 1).
This commit is contained in:
Jeffrey Wilcke
2015-10-19 16:08:17 +02:00
parent 9422eec554
commit a1d9ef48c5
19 changed files with 702 additions and 643 deletions
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136
core/blockchain.go
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@ -33,6 +33,7 @@ import (
"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/core/vm"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/event"
@ -61,17 +62,34 @@ const (
blockCacheLimit = 256
maxFutureBlocks = 256
maxTimeFutureBlocks = 30
// must be bumped when consensus algorithm is changed, this forces the upgradedb
// command to be run (forces the blocks to be imported again using the new algorithm)
BlockChainVersion = 3
)
// BlockChain represents the canonical chain given a database with a genesis
// block. The Blockchain manages chain imports, reverts, chain reorganisations.
//
// Importing blocks in to the block chain happens according to the set of rules
// defined by the two stage Validator. Processing of blocks is done using the
// Processor which processes the included transaction. The validation of the state
// is done in the second part of the Validator. Failing results in aborting of
// the import.
//
// The BlockChain also helps in returning blocks from **any** chain included
// in the database as well as blocks that represents the canonical chain. It's
// important to note that GetBlock can return any block and does not need to be
// included in the canonical one where as GetBlockByNumber always represents the
// canonical chain.
type BlockChain struct {
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
procmu sync.RWMutex
checkpoint int // checkpoint counts towards the new checkpoint
currentHeader *types.Header // Current head of the header chain (may be above the block chain!)
@ -91,10 +109,15 @@ type BlockChain struct {
procInterrupt int32 // interrupt signaler for block processing
wg sync.WaitGroup
pow pow.PoW
rand *mrand.Rand
pow pow.PoW
rand *mrand.Rand
processor Processor
validator Validator
}
// NewBlockChain returns a fully initialised block chain using information
// available in the database. It initialiser the default Ethereum Validator and
// Processor.
func NewBlockChain(chainDb ethdb.Database, pow pow.PoW, mux *event.TypeMux) (*BlockChain, error) {
headerCache, _ := lru.New(headerCacheLimit)
bodyCache, _ := lru.New(bodyCacheLimit)
@ -121,6 +144,8 @@ func NewBlockChain(chainDb ethdb.Database, pow pow.PoW, mux *event.TypeMux) (*Bl
return nil, err
}
bc.rand = mrand.New(mrand.NewSource(seed.Int64()))
bc.SetValidator(NewBlockValidator(bc, pow))
bc.SetProcessor(NewStateProcessor(bc))
bc.genesisBlock = bc.GetBlockByNumber(0)
if bc.genesisBlock == nil {
@ -292,6 +317,7 @@ func (self *BlockChain) FastSyncCommitHead(hash common.Hash) error {
return nil
}
// GasLimit returns the gas limit of the current HEAD block.
func (self *BlockChain) GasLimit() *big.Int {
self.mu.RLock()
defer self.mu.RUnlock()
@ -299,6 +325,7 @@ func (self *BlockChain) GasLimit() *big.Int {
return self.currentBlock.GasLimit()
}
// LastBlockHash return the hash of the HEAD block.
func (self *BlockChain) LastBlockHash() common.Hash {
self.mu.RLock()
defer self.mu.RUnlock()
@ -333,6 +360,8 @@ func (self *BlockChain) CurrentFastBlock() *types.Block {
return self.currentFastBlock
}
// Status returns status information about the current chain such as the HEAD Td,
// the HEAD hash and the hash of the genesis block.
func (self *BlockChain) Status() (td *big.Int, currentBlock common.Hash, genesisBlock common.Hash) {
self.mu.RLock()
defer self.mu.RUnlock()
@ -340,10 +369,38 @@ func (self *BlockChain) Status() (td *big.Int, currentBlock common.Hash, genesis
return self.GetTd(self.currentBlock.Hash()), self.currentBlock.Hash(), self.genesisBlock.Hash()
}
func (self *BlockChain) SetProcessor(proc types.BlockProcessor) {
self.processor = proc
// SetProcessor sets the processor required for making state modifications.
func (self *BlockChain) SetProcessor(processor Processor) {
self.procmu.Lock()
defer self.procmu.Unlock()
self.processor = processor
}
// SetValidator sets the validator which is used to validate incoming blocks.
func (self *BlockChain) SetValidator(validator Validator) {
self.procmu.Lock()
defer self.procmu.Unlock()
self.validator = validator
}
// Validator returns the current validator.
func (self *BlockChain) Validator() Validator {
self.procmu.RLock()
defer self.procmu.RUnlock()
return self.validator
}
// Processor returns the current processor.
func (self *BlockChain) Processor() Processor {
self.procmu.RLock()
defer self.procmu.RUnlock()
return self.processor
}
// AuxValidator returns the auxiliary validator (Proof of work atm)
func (self *BlockChain) AuxValidator() pow.PoW { return self.pow }
// State returns a new mutable state based on the current HEAD block.
func (self *BlockChain) State() (*state.StateDB, error) {
return state.New(self.CurrentBlock().Root(), self.chainDb)
}
@ -606,6 +663,8 @@ func (self *BlockChain) GetUnclesInChain(block *types.Block, length int) []*type
return uncles
}
// Stop stops the blockchain service. If any imports are currently in progress
// it will abort them using the procInterrupt.
func (bc *BlockChain) Stop() {
if !atomic.CompareAndSwapInt32(&bc.running, 0, 1) {
return
@ -758,9 +817,9 @@ func (self *BlockChain) InsertHeaderChain(chain []*types.Header, checkFreq int)
var err error
if index == 0 {
err = self.processor.ValidateHeader(header, checkPow, false)
err = self.Validator().ValidateHeader(header, self.GetHeader(header.ParentHash), checkPow)
} else {
err = self.processor.ValidateHeaderWithParent(header, chain[index-1], checkPow, false)
err = self.Validator().ValidateHeader(header, chain[index-1], checkPow)
}
if err != nil {
errs[index] = err
@ -1025,9 +1084,10 @@ func (self *BlockChain) InsertChain(chain types.Blocks) (int, error) {
// faster than direct delivery and requires much less mutex
// acquiring.
var (
stats struct{ queued, processed, ignored int }
events = make([]interface{}, 0, len(chain))
tstart = time.Now()
stats struct{ queued, processed, ignored int }
events = make([]interface{}, 0, len(chain))
coalescedLogs vm.Logs
tstart = time.Now()
nonceChecked = make([]bool, len(chain))
)
@ -1057,12 +1117,12 @@ func (self *BlockChain) InsertChain(chain types.Blocks) (int, error) {
if BadHashes[block.Hash()] {
err := BadHashError(block.Hash())
blockErr(block, err)
reportBlock(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)
// 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++
@ -1089,14 +1149,41 @@ func (self *BlockChain) InsertChain(chain types.Blocks) (int, error) {
continue
}
blockErr(block, err)
go ReportBlock(block, err)
reportBlock(block, err)
return i, err
}
// Create a new statedb using the parent block and report an
// error if it fails.
statedb, err := state.New(self.GetBlock(block.ParentHash()).Root(), self.chainDb)
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)
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 := PutBlockReceipts(self.chainDb, block.Hash(), receipts); err != nil {
glog.V(logger.Warn).Infoln("error writing block receipts:", err)
return i, err
}
txcount += len(block.Transactions())
@ -1105,6 +1192,7 @@ func (self *BlockChain) InsertChain(chain types.Blocks) (int, error) {
if err != nil {
return i, err
}
switch status {
case CanonStatTy:
if glog.V(logger.Debug) {
@ -1141,7 +1229,7 @@ func (self *BlockChain) InsertChain(chain types.Blocks) (int, error) {
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)
go self.postChainEvents(events, coalescedLogs)
return 0, nil
}
@ -1239,7 +1327,9 @@ func (self *BlockChain) reorg(oldBlock, newBlock *types.Block) error {
// postChainEvents iterates over the events generated by a chain insertion and
// posts them into the event mux.
func (self *BlockChain) postChainEvents(events []interface{}) {
func (self *BlockChain) postChainEvents(events []interface{}, logs vm.Logs) {
// post event logs for further processing
self.eventMux.Post(logs)
for _, event := range events {
if event, ok := event.(ChainEvent); ok {
// We need some control over the mining operation. Acquiring locks and waiting for the miner to create new block takes too long
@ -1265,9 +1355,13 @@ func (self *BlockChain) update() {
}
}
func blockErr(block *types.Block, err error) {
// reportBlock reports the given block and error using the canonical block
// reporting tool. Reporting the block to the service is handled in a separate
// goroutine.
func reportBlock(block *types.Block, err error) {
if glog.V(logger.Error) {
glog.Errorf("Bad block #%v (%s)\n", block.Number(), block.Hash().Hex())
glog.Errorf(" %v", err)
}
go ReportBlock(block, err)
}