plugeth/core/chain_manager.go

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