package chain
import (
"bytes"
"container/list"
"fmt"
"math/big"
"github.com/ethereum/go-ethereum/ethutil"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/state"
)
var chainlogger = logger.NewLogger("CHAIN")
func AddTestNetFunds(block *Block) {
for _, addr := range []string{
"51ba59315b3a95761d0863b05ccc7a7f54703d99",
"e4157b34ea9615cfbde6b4fda419828124b70c78",
"b9c015918bdaba24b4ff057a92a3873d6eb201be",
"6c386a4b26f73c802f34673f7248bb118f97424a",
"cd2a3d9f938e13cd947ec05abc7fe734df8dd826",
"2ef47100e0787b915105fd5e3f4ff6752079d5cb",
"e6716f9544a56c530d868e4bfbacb172315bdead",
"1a26338f0d905e295fccb71fa9ea849ffa12aaf4",
} {
codedAddr := ethutil.Hex2Bytes(addr)
account := block.state.GetAccount(codedAddr)
account.SetBalance(ethutil.Big("1606938044258990275541962092341162602522202993782792835301376")) //ethutil.BigPow(2, 200)
block.state.UpdateStateObject(account)
}
}
func CalcDifficulty(block, parent *Block) *big.Int {
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
}
type ChainManager struct {
eth EthManager
genesisBlock *Block
// Last known total difficulty
TD *big.Int
LastBlockNumber uint64
CurrentBlock *Block
LastBlockHash []byte
workingChain *BlockChain
}
func NewChainManager(ethereum EthManager) *ChainManager {
bc := &ChainManager{}
bc.genesisBlock = NewBlockFromBytes(ethutil.Encode(Genesis))
bc.eth = ethereum
bc.setLastBlock()
return bc
}
func (bc *ChainManager) setLastBlock() {
data, _ := ethutil.Config.Db.Get([]byte("LastBlock"))
if len(data) != 0 {
// Prep genesis
AddTestNetFunds(bc.genesisBlock)
block := NewBlockFromBytes(data)
bc.CurrentBlock = block
bc.LastBlockHash = block.Hash()
bc.LastBlockNumber = block.Number.Uint64()
// Set the last know difficulty (might be 0x0 as initial value, Genesis)
bc.TD = ethutil.BigD(ethutil.Config.Db.LastKnownTD())
} else {
bc.Reset()
}
chainlogger.Infof("Last block (#%d) %x\n", bc.LastBlockNumber, bc.CurrentBlock.Hash())
}
// Block creation & chain handling
func (bc *ChainManager) NewBlock(coinbase []byte) *Block {
var root interface{}
hash := ZeroHash256
if bc.CurrentBlock != nil {
root = bc.CurrentBlock.Root()
hash = bc.LastBlockHash
}
block := CreateBlock(
root,
hash,
coinbase,
ethutil.BigPow(2, 32),
nil,
"")
block.MinGasPrice = big.NewInt(10000000000000)
parent := bc.CurrentBlock
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)
}
return block
}
func (bc *ChainManager) Reset() {
AddTestNetFunds(bc.genesisBlock)
bc.genesisBlock.state.Trie.Sync()
// Prepare the genesis block
bc.add(bc.genesisBlock)
bc.CurrentBlock = bc.genesisBlock
bc.SetTotalDifficulty(ethutil.Big("0"))
// Set the last know difficulty (might be 0x0 as initial value, Genesis)
bc.TD = ethutil.BigD(ethutil.Config.Db.LastKnownTD())
}
// Add a block to the chain and record addition information
func (bc *ChainManager) add(block *Block) {
bc.writeBlockInfo(block)
bc.CurrentBlock = block
bc.LastBlockHash = block.Hash()
encodedBlock := block.RlpEncode()
ethutil.Config.Db.Put(block.Hash(), encodedBlock)
ethutil.Config.Db.Put([]byte("LastBlock"), encodedBlock)
//chainlogger.Infof("Imported block #%d (%x...)\n", block.Number, block.Hash()[0:4])
}
// Accessors
func (bc *ChainManager) Genesis() *Block {
return bc.genesisBlock
}
// Block fetching methods
func (bc *ChainManager) HasBlock(hash []byte) bool {
data, _ := ethutil.Config.Db.Get(hash)
return len(data) != 0
}
func (self *ChainManager) GetChainHashesFromHash(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) *Block {
data, _ := ethutil.Config.Db.Get(hash)
if len(data) == 0 {
if self.workingChain != nil {
// Check the temp chain
for e := self.workingChain.Front(); e != nil; e = e.Next() {
if bytes.Compare(e.Value.(*link).block.Hash(), hash) == 0 {
return e.Value.(*link).block
}
}
}
return nil
}
return NewBlockFromBytes(data)
}
func (self *ChainManager) GetBlockByNumber(num uint64) *Block {
block := self.CurrentBlock
for ; block != nil; block = self.GetBlock(block.PrevHash) {
if block.Number.Uint64() == num {
break
}
}
if block != nil && block.Number.Uint64() == 0 && num != 0 {
return nil
}
return block
}
func (bc *ChainManager) SetTotalDifficulty(td *big.Int) {
ethutil.Config.Db.Put([]byte("LTD"), td.Bytes())
bc.TD = td
}
func (self *ChainManager) CalcTotalDiff(block *Block) (*big.Int, error) {
parent := self.GetBlock(block.PrevHash)
if parent == nil {
return nil, fmt.Errorf("Unable to calculate total diff without known parent %x", block.PrevHash)
}
parentTd := parent.BlockInfo().TD
uncleDiff := new(big.Int)
for _, uncle := range block.Uncles {
uncleDiff = uncleDiff.Add(uncleDiff, uncle.Difficulty)
}
td := new(big.Int)
td = td.Add(parentTd, uncleDiff)
td = td.Add(td, block.Difficulty)
return td, nil
}
func (bc *ChainManager) BlockInfo(block *Block) BlockInfo {
bi := BlockInfo{}
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 *Block) {
bc.LastBlockNumber++
bi := BlockInfo{Number: bc.LastBlockNumber, Hash: block.Hash(), Parent: block.PrevHash, TD: bc.TD}
// 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())
}
func (bc *ChainManager) Stop() {
if bc.CurrentBlock != nil {
chainlogger.Infoln("Stopped")
}
}
func (self *ChainManager) NewIterator(startHash []byte) *ChainIterator {
return &ChainIterator{self, self.GetBlock(startHash)}
}
// This function assumes you've done your checking. No checking is done at this stage anymore
func (self *ChainManager) InsertChain(chain *BlockChain) {
for e := chain.Front(); e != nil; e = e.Next() {
link := e.Value.(*link)
self.add(link.block)
self.SetTotalDifficulty(link.td)
self.eth.EventMux().Post(NewBlockEvent{link.block})
self.eth.EventMux().Post(link.messages)
}
b, e := chain.Front(), chain.Back()
if b != nil && e != nil {
front, back := b.Value.(*link).block, e.Value.(*link).block
chainlogger.Infof("Imported %d blocks. #%v (%x) / %#v (%x)", chain.Len(), front.Number, front.Hash()[0:4], back.Number, back.Hash()[0:4])
}
}
func (self *ChainManager) TestChain(chain *BlockChain) (td *big.Int, err error) {
self.workingChain = chain
defer func() { self.workingChain = nil }()
for e := chain.Front(); e != nil; e = e.Next() {
var (
l = e.Value.(*link)
block = l.block
parent = self.GetBlock(block.PrevHash)
)
if parent == nil {
err = fmt.Errorf("incoming chain broken on hash %x\n", block.PrevHash[0:4])
return
}
var messages state.Messages
td, messages, err = self.eth.BlockManager().ProcessWithParent(block, parent)
if err != nil {
chainlogger.Infoln(err)
chainlogger.Debugf("Block #%v failed (%x...)\n", block.Number, block.Hash()[0:4])
chainlogger.Debugln(block)
err = fmt.Errorf("incoming chain failed %v\n", err)
return
}
l.td = td
l.messages = messages
}
if td.Cmp(self.TD) <= 0 {
err = &TDError{td, self.TD}
return
}
self.workingChain = nil
return
}
type link struct {
block *Block
messages state.Messages
td *big.Int
}
type BlockChain struct {
*list.List
}
func NewChain(blocks Blocks) *BlockChain {
chain := &BlockChain{list.New()}
for _, block := range blocks {
chain.PushBack(&link{block, nil, nil})
}
return chain
}
func (self *BlockChain) RlpEncode() []byte {
dat := make([]interface{}, 0)
for e := self.Front(); e != nil; e = e.Next() {
dat = append(dat, e.Value.(*link).block.RlpData())
}
return ethutil.Encode(dat)
}
type ChainIterator struct {
cm *ChainManager
block *Block // current block in the iterator
}
func (self *ChainIterator) Prev() *Block {
self.block = self.cm.GetBlock(self.block.PrevHash)
return self.block
}
