416 lines
9.5 KiB
Go
416 lines
9.5 KiB
Go
package core
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import (
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"bytes"
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"fmt"
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"math/big"
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"sync"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/ethutil"
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"github.com/ethereum/go-ethereum/event"
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"github.com/ethereum/go-ethereum/logger"
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"github.com/ethereum/go-ethereum/rlp"
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"github.com/ethereum/go-ethereum/state"
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)
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var chainlogger = logger.NewLogger("CHAIN")
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type ChainEvent struct {
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Block *types.Block
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Td *big.Int
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}
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type StateQuery interface {
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GetAccount(addr []byte) *state.StateObject
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}
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func CalcDifficulty(block, parent *types.Block) *big.Int {
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diff := new(big.Int)
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adjust := new(big.Int).Rsh(parent.Difficulty(), 10)
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if block.Time() >= parent.Time()+8 {
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diff.Sub(parent.Difficulty(), adjust)
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} else {
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diff.Add(parent.Difficulty(), adjust)
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}
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return diff
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}
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func CalculateTD(block, parent *types.Block) *big.Int {
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uncleDiff := new(big.Int)
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for _, uncle := range block.Uncles() {
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uncleDiff = uncleDiff.Add(uncleDiff, uncle.Difficulty)
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}
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// TD(genesis_block) = 0 and TD(B) = TD(B.parent) + sum(u.difficulty for u in B.uncles) + B.difficulty
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td := new(big.Int)
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td = td.Add(parent.Td, uncleDiff)
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td = td.Add(td, block.Header().Difficulty)
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return td
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}
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func CalcGasLimit(parent, block *types.Block) *big.Int {
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if block.Number().Cmp(big.NewInt(0)) == 0 {
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return ethutil.BigPow(10, 6)
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}
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// ((1024-1) * parent.gasLimit + (gasUsed * 6 / 5)) / 1024
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previous := new(big.Int).Mul(big.NewInt(1024-1), parent.GasLimit())
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current := new(big.Rat).Mul(new(big.Rat).SetInt(parent.GasUsed()), big.NewRat(6, 5))
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curInt := new(big.Int).Div(current.Num(), current.Denom())
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result := new(big.Int).Add(previous, curInt)
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result.Div(result, big.NewInt(1024))
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min := big.NewInt(125000)
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return ethutil.BigMax(min, result)
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}
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type ChainManager struct {
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//eth EthManager
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db ethutil.Database
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processor types.BlockProcessor
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eventMux *event.TypeMux
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genesisBlock *types.Block
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// Last known total difficulty
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mu sync.RWMutex
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tsmu sync.RWMutex
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td *big.Int
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currentBlock *types.Block
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lastBlockHash []byte
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transState *state.StateDB
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}
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func NewChainManager(db ethutil.Database, mux *event.TypeMux) *ChainManager {
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bc := &ChainManager{db: db, genesisBlock: GenesisBlock(db), eventMux: mux}
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bc.setLastBlock()
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bc.transState = bc.State().Copy()
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return bc
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}
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func (self *ChainManager) Td() *big.Int {
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self.mu.RLock()
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defer self.mu.RUnlock()
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return self.td
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}
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func (self *ChainManager) LastBlockHash() []byte {
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self.mu.RLock()
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defer self.mu.RUnlock()
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return self.lastBlockHash
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}
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func (self *ChainManager) CurrentBlock() *types.Block {
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self.mu.RLock()
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defer self.mu.RUnlock()
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return self.currentBlock
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}
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func (self *ChainManager) Status() (td *big.Int, currentBlock []byte, genesisBlock []byte) {
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self.mu.RLock()
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defer self.mu.RUnlock()
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return self.td, self.currentBlock.Hash(), self.Genesis().Hash()
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}
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func (self *ChainManager) SetProcessor(proc types.BlockProcessor) {
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self.processor = proc
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}
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func (self *ChainManager) State() *state.StateDB {
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return state.New(self.CurrentBlock().Root(), self.db)
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}
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func (self *ChainManager) TransState() *state.StateDB {
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self.tsmu.RLock()
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defer self.tsmu.RUnlock()
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return self.transState
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}
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func (self *ChainManager) setTransState(statedb *state.StateDB) {
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self.transState = statedb
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}
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func (bc *ChainManager) setLastBlock() {
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data, _ := bc.db.Get([]byte("LastBlock"))
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if len(data) != 0 {
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var block types.Block
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rlp.Decode(bytes.NewReader(data), &block)
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bc.currentBlock = &block
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bc.lastBlockHash = block.Hash()
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// Set the last know difficulty (might be 0x0 as initial value, Genesis)
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bc.td = ethutil.BigD(bc.db.LastKnownTD())
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} else {
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bc.Reset()
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}
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chainlogger.Infof("Last block (#%v) %x TD=%v\n", bc.currentBlock.Number(), bc.currentBlock.Hash(), bc.td)
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}
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// Block creation & chain handling
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func (bc *ChainManager) NewBlock(coinbase []byte) *types.Block {
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bc.mu.RLock()
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defer bc.mu.RUnlock()
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var root []byte
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parentHash := ZeroHash256
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if bc.currentBlock != nil {
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root = bc.currentBlock.Header().Root
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parentHash = bc.lastBlockHash
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}
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block := types.NewBlock(
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parentHash,
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coinbase,
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root,
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ethutil.BigPow(2, 32),
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nil,
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"")
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block.SetUncles(nil)
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block.SetTransactions(nil)
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block.SetReceipts(nil)
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parent := bc.currentBlock
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if parent != nil {
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header := block.Header()
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header.Difficulty = CalcDifficulty(block, parent)
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header.Number = new(big.Int).Add(parent.Header().Number, ethutil.Big1)
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header.GasLimit = CalcGasLimit(parent, block)
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}
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return block
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}
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func (bc *ChainManager) Reset() {
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bc.mu.Lock()
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defer bc.mu.Unlock()
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for block := bc.currentBlock; block != nil; block = bc.GetBlock(block.Header().ParentHash) {
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bc.db.Delete(block.Hash())
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}
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// Prepare the genesis block
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bc.write(bc.genesisBlock)
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bc.insert(bc.genesisBlock)
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bc.currentBlock = bc.genesisBlock
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bc.setTotalDifficulty(ethutil.Big("0"))
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}
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func (self *ChainManager) Export() []byte {
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self.mu.RLock()
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defer self.mu.RUnlock()
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chainlogger.Infof("exporting %v blocks...\n", self.currentBlock.Header().Number)
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blocks := make([]*types.Block, int(self.currentBlock.NumberU64())+1)
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for block := self.currentBlock; block != nil; block = self.GetBlock(block.Header().ParentHash) {
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blocks[block.NumberU64()] = block
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}
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return ethutil.Encode(blocks)
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}
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func (bc *ChainManager) insert(block *types.Block) {
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encodedBlock := ethutil.Encode(block)
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bc.db.Put([]byte("LastBlock"), encodedBlock)
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bc.currentBlock = block
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bc.lastBlockHash = block.Hash()
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}
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func (bc *ChainManager) write(block *types.Block) {
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encodedBlock := ethutil.Encode(block.RlpDataForStorage())
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bc.db.Put(block.Hash(), encodedBlock)
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}
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// Accessors
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func (bc *ChainManager) Genesis() *types.Block {
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return bc.genesisBlock
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}
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// Block fetching methods
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func (bc *ChainManager) HasBlock(hash []byte) bool {
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data, _ := bc.db.Get(hash)
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return len(data) != 0
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}
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func (self *ChainManager) GetBlockHashesFromHash(hash []byte, max uint64) (chain [][]byte) {
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block := self.GetBlock(hash)
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if block == nil {
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return
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}
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// XXX Could be optimised by using a different database which only holds hashes (i.e., linked list)
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for i := uint64(0); i < max; i++ {
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parentHash := block.Header().ParentHash
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block = self.GetBlock(parentHash)
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if block == nil {
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chainlogger.Infof("GetBlockHashesFromHash Parent UNKNOWN %x\n", parentHash)
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break
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}
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chain = append(chain, block.Hash())
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if block.Header().Number.Cmp(ethutil.Big0) <= 0 {
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break
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}
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}
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fmt.Printf("get hash %x (%d)\n", hash, len(chain))
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return
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}
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func (self *ChainManager) GetBlock(hash []byte) *types.Block {
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data, _ := self.db.Get(hash)
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if len(data) == 0 {
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return nil
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}
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var block types.Block
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if err := rlp.Decode(bytes.NewReader(data), &block); err != nil {
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fmt.Println(err)
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return nil
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}
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return &block
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}
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func (self *ChainManager) GetUnclesInChain(block *types.Block, length int) (uncles []*types.Header) {
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for i := 0; block != nil && i < length; i++ {
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uncles = append(uncles, block.Uncles()...)
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block = self.GetBlock(block.ParentHash())
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}
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return
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}
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func (self *ChainManager) GetAncestors(block *types.Block, length int) (blocks []*types.Block) {
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for i := 0; i < length; i++ {
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block = self.GetBlock(block.ParentHash())
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if block == nil {
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break
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}
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blocks = append(blocks, block)
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}
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return
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}
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func (self *ChainManager) GetBlockByNumber(num uint64) *types.Block {
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self.mu.RLock()
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defer self.mu.RUnlock()
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var block *types.Block
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if num <= self.currentBlock.Number().Uint64() {
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block = self.currentBlock
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for ; block != nil; block = self.GetBlock(block.Header().ParentHash) {
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if block.Header().Number.Uint64() == num {
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break
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}
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}
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}
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return block
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}
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func (bc *ChainManager) setTotalDifficulty(td *big.Int) {
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bc.db.Put([]byte("LTD"), td.Bytes())
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bc.td = td
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}
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func (self *ChainManager) CalcTotalDiff(block *types.Block) (*big.Int, error) {
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parent := self.GetBlock(block.Header().ParentHash)
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if parent == nil {
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return nil, fmt.Errorf("Unable to calculate total diff without known parent %x", block.Header().ParentHash)
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}
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parentTd := parent.Td
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uncleDiff := new(big.Int)
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for _, uncle := range block.Uncles() {
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uncleDiff = uncleDiff.Add(uncleDiff, uncle.Difficulty)
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}
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td := new(big.Int)
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td = td.Add(parentTd, uncleDiff)
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td = td.Add(td, block.Header().Difficulty)
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return td, nil
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}
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func (bc *ChainManager) Stop() {
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if bc.CurrentBlock != nil {
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chainlogger.Infoln("Stopped")
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}
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}
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func (self *ChainManager) InsertChain(chain types.Blocks) error {
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self.tsmu.Lock()
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defer self.tsmu.Unlock()
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for _, block := range chain {
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td, err := self.processor.Process(block)
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if err != nil {
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if IsKnownBlockErr(err) {
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continue
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}
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h := block.Header()
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chainlogger.Infof("block #%v process failed (%x)\n", h.Number, h.Hash()[:4])
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chainlogger.Infoln(block)
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chainlogger.Infoln(err)
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return err
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}
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block.Td = td
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var chain, split bool
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self.mu.Lock()
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{
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self.write(block)
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cblock := self.currentBlock
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if td.Cmp(self.td) > 0 {
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if block.Header().Number.Cmp(new(big.Int).Add(cblock.Header().Number, ethutil.Big1)) < 0 {
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chainlogger.Infof("Split detected. New head #%v (%x) TD=%v, was #%v (%x) TD=%v\n", block.Header().Number, block.Hash()[:4], td, cblock.Header().Number, cblock.Hash()[:4], self.td)
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split = true
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}
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self.setTotalDifficulty(td)
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self.insert(block)
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chain = true
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}
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}
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self.mu.Unlock()
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if chain {
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self.eventMux.Post(ChainEvent{block, td})
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}
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if split {
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self.setTransState(state.New(block.Root(), self.db))
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self.eventMux.Post(ChainSplitEvent{block})
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}
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}
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return nil
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}
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// Satisfy state query interface
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func (self *ChainManager) GetAccount(addr []byte) *state.StateObject {
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return self.State().GetAccount(addr)
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}
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