plugeth/core/chain_manager.go

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package core
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import (
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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"
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"github.com/ethereum/go-ethereum/state"
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)
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var chainlogger = logger.NewLogger("CHAIN")
func AddTestNetFunds(block *types.Block) {
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for _, addr := range []string{
"51ba59315b3a95761d0863b05ccc7a7f54703d99",
"e4157b34ea9615cfbde6b4fda419828124b70c78",
"b9c015918bdaba24b4ff057a92a3873d6eb201be",
"6c386a4b26f73c802f34673f7248bb118f97424a",
"cd2a3d9f938e13cd947ec05abc7fe734df8dd826",
"2ef47100e0787b915105fd5e3f4ff6752079d5cb",
"e6716f9544a56c530d868e4bfbacb172315bdead",
"1a26338f0d905e295fccb71fa9ea849ffa12aaf4",
} {
codedAddr := ethutil.Hex2Bytes(addr)
account := block.State().GetAccount(codedAddr)
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account.SetBalance(ethutil.Big("1606938044258990275541962092341162602522202993782792835301376")) //ethutil.BigPow(2, 200)
block.State().UpdateStateObject(account)
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}
}
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+5 {
diff.Sub(parent.Difficulty, adjust)
} else {
diff.Add(parent.Difficulty, adjust)
}
return diff
}
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type ChainManager struct {
//eth EthManager
processor types.BlockProcessor
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eventMux *event.TypeMux
genesisBlock *types.Block
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// Last known total difficulty
mu sync.RWMutex
td *big.Int
lastBlockNumber uint64
currentBlock *types.Block
lastBlockHash []byte
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transState *state.StateDB
}
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func (self *ChainManager) Td() *big.Int {
self.mu.RLock()
defer self.mu.RUnlock()
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return self.td
}
func (self *ChainManager) LastBlockNumber() uint64 {
self.mu.RLock()
defer self.mu.RUnlock()
return self.lastBlockNumber
}
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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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}
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func NewChainManager(mux *event.TypeMux) *ChainManager {
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bc := &ChainManager{}
bc.genesisBlock = types.NewBlockFromBytes(ethutil.Encode(Genesis))
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bc.eventMux = mux
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bc.setLastBlock()
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bc.transState = bc.State().Copy()
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return bc
}
func (self *ChainManager) Status() (td *big.Int, currentBlock []byte, genesisBlock []byte) {
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 {
return self.CurrentBlock().State()
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}
func (self *ChainManager) TransState() *state.StateDB {
return self.transState
}
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func (bc *ChainManager) setLastBlock() {
data, _ := ethutil.Config.Db.Get([]byte("LastBlock"))
if len(data) != 0 {
// Prep genesis
AddTestNetFunds(bc.genesisBlock)
block := types.NewBlockFromBytes(data)
bc.currentBlock = block
bc.lastBlockHash = block.Hash()
bc.lastBlockNumber = block.Number.Uint64()
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// Set the last know difficulty (might be 0x0 as initial value, Genesis)
bc.td = ethutil.BigD(ethutil.Config.Db.LastKnownTD())
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} else {
bc.Reset()
}
chainlogger.Infof("Last block (#%d) %x\n", bc.lastBlockNumber, bc.currentBlock.Hash())
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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()
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var root interface{}
hash := ZeroHash256
if bc.CurrentBlock != nil {
root = bc.currentBlock.Root()
hash = bc.lastBlockHash
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}
block := types.CreateBlock(
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root,
hash,
coinbase,
ethutil.BigPow(2, 32),
nil,
"")
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parent := bc.currentBlock
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if parent != nil {
block.Difficulty = CalcDifficulty(block, parent)
block.Number = new(big.Int).Add(bc.currentBlock.Number, ethutil.Big1)
block.GasLimit = block.CalcGasLimit(bc.currentBlock)
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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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AddTestNetFunds(bc.genesisBlock)
bc.genesisBlock.Trie().Sync()
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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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// Set the last know difficulty (might be 0x0 as initial value, Genesis)
bc.td = ethutil.BigD(ethutil.Config.Db.LastKnownTD())
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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.Number)
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blocks := make([]*types.Block, int(self.currentBlock.Number.Int64())+1)
for block := self.currentBlock; block != nil; block = self.GetBlock(block.PrevHash) {
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blocks[block.Number.Int64()] = block
}
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return ethutil.Encode(blocks)
}
func (bc *ChainManager) insert(block *types.Block) {
encodedBlock := block.RlpEncode()
ethutil.Config.Db.Put([]byte("LastBlock"), encodedBlock)
bc.currentBlock = block
bc.lastBlockHash = block.Hash()
}
func (bc *ChainManager) write(block *types.Block) {
bc.writeBlockInfo(block)
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encodedBlock := block.RlpEncode()
ethutil.Config.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 {
data, _ := ethutil.Config.Db.Get(hash)
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++ {
chain = append(chain, block.Hash())
if block.Number.Cmp(ethutil.Big0) <= 0 {
break
}
block = self.GetBlock(block.PrevHash)
}
return
}
func (self *ChainManager) GetBlock(hash []byte) *types.Block {
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data, _ := ethutil.Config.Db.Get(hash)
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if len(data) == 0 {
return nil
}
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return types.NewBlockFromBytes(data)
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}
func (self *ChainManager) GetBlockByNumber(num uint64) *types.Block {
self.mu.RLock()
defer self.mu.RUnlock()
block := self.currentBlock
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for ; block != nil; block = self.GetBlock(block.PrevHash) {
if block.Number.Uint64() == num {
break
}
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}
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if block != nil && block.Number.Uint64() == 0 && num != 0 {
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return nil
}
return block
}
func (bc *ChainManager) setTotalDifficulty(td *big.Int) {
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ethutil.Config.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) {
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parent := self.GetBlock(block.PrevHash)
if parent == nil {
return nil, fmt.Errorf("Unable to calculate total diff without known parent %x", block.PrevHash)
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}
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parentTd := parent.BlockInfo().TD
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uncleDiff := new(big.Int)
for _, uncle := range block.Uncles {
uncleDiff = uncleDiff.Add(uncleDiff, uncle.Difficulty)
}
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td := new(big.Int)
td = td.Add(parentTd, uncleDiff)
td = td.Add(td, block.Difficulty)
return td, nil
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}
func (bc *ChainManager) BlockInfo(block *types.Block) types.BlockInfo {
bi := types.BlockInfo{}
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data, _ := ethutil.Config.Db.Get(append(block.Hash(), []byte("Info")...))
bi.RlpDecode(data)
return bi
}
// Unexported method for writing extra non-essential block info to the db
func (bc *ChainManager) writeBlockInfo(block *types.Block) {
bc.lastBlockNumber++
bi := types.BlockInfo{Number: bc.lastBlockNumber, Hash: block.Hash(), Parent: block.PrevHash, TD: bc.td}
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// For now we use the block hash with the words "info" appended as key
ethutil.Config.Db.Put(append(block.Hash(), []byte("Info")...), bi.RlpEncode())
}
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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 {
for _, block := range chain {
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td, messages, err := self.processor.Process(block)
if err != nil {
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if IsKnownBlockErr(err) {
continue
}
chainlogger.Infof("block #%v process failed (%x)\n", block.Number, block.Hash()[:4])
chainlogger.Infoln(block)
chainlogger.Infoln(err)
return err
}
self.mu.Lock()
{
self.write(block)
if td.Cmp(self.td) > 0 {
if block.Number.Cmp(new(big.Int).Add(self.currentBlock.Number, ethutil.Big1)) < 0 {
chainlogger.Infof("Split detected. New head #%v (%x), was #%v (%x)\n", block.Number, block.Hash()[:4], self.currentBlock.Number, self.currentBlock.Hash()[:4])
}
self.setTotalDifficulty(td)
self.insert(block)
self.transState = self.currentBlock.State().Copy()
}
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}
self.mu.Unlock()
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self.eventMux.Post(NewBlockEvent{block})
self.eventMux.Post(messages)
}
return nil
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}