package ethchain import ( "bytes" "fmt" "math/big" "github.com/ethereum/eth-go/ethlog" "github.com/ethereum/eth-go/ethutil" ) var chainlogger = ethlog.NewLogger("CHAIN") type BlockChain struct { Ethereum EthManager // The famous, the fabulous Mister GENESIIIIIIS (block) genesisBlock *Block // Last known total difficulty TD *big.Int LastBlockNumber uint64 CurrentBlock *Block LastBlockHash []byte } func NewBlockChain(ethereum EthManager) *BlockChain { bc := &BlockChain{} bc.genesisBlock = NewBlockFromBytes(ethutil.Encode(Genesis)) bc.Ethereum = ethereum bc.setLastBlock() return bc } func (bc *BlockChain) Genesis() *Block { return bc.genesisBlock } func (bc *BlockChain) NewBlock(coinbase []byte) *Block { var root interface{} hash := ZeroHash256 if bc.CurrentBlock != nil { root = bc.CurrentBlock.state.Trie.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 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 } func (bc *BlockChain) Reset() { AddTestNetFunds(bc.genesisBlock) bc.genesisBlock.state.Trie.Sync() // Prepare the genesis block bc.Add(bc.genesisBlock) fk := append([]byte("bloom"), bc.genesisBlock.Hash()...) bc.Ethereum.Db().Put(fk, make([]byte, 255)) 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()) } func (bc *BlockChain) HasBlock(hash []byte) bool { data, _ := ethutil.Config.Db.Get(hash) return len(data) != 0 } // TODO: At one point we might want to save a block by prevHash in the db to optimise this... func (bc *BlockChain) HasBlockWithPrevHash(hash []byte) bool { block := bc.CurrentBlock for ; block != nil; block = bc.GetBlock(block.PrevHash) { if bytes.Compare(hash, block.PrevHash) == 0 { return true } } return false } func (bc *BlockChain) CalculateBlockTD(block *Block) *big.Int { blockDiff := new(big.Int) for _, uncle := range block.Uncles { blockDiff = blockDiff.Add(blockDiff, uncle.Difficulty) } blockDiff = blockDiff.Add(blockDiff, block.Difficulty) return blockDiff } func (bc *BlockChain) GenesisBlock() *Block { return bc.genesisBlock } func (self *BlockChain) 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 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.Balance = ethutil.Big("1606938044258990275541962092341162602522202993782792835301376") //ethutil.BigPow(2, 200) block.state.UpdateStateObject(account) } } func (bc *BlockChain) 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()) } func (bc *BlockChain) SetTotalDifficulty(td *big.Int) { ethutil.Config.Db.Put([]byte("LTD"), td.Bytes()) bc.TD = td } // Add a block to the chain and record addition information func (bc *BlockChain) Add(block *Block) { bc.writeBlockInfo(block) // Prepare the genesis 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) } func (self *BlockChain) 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 *BlockChain) GetBlock(hash []byte) *Block { data, _ := ethutil.Config.Db.Get(hash) if len(data) == 0 { return nil } return NewBlockFromBytes(data) } func (self *BlockChain) 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 (self *BlockChain) GetBlockBack(num uint64) *Block { block := self.CurrentBlock for ; num != 0 && block != nil; num-- { block = self.GetBlock(block.PrevHash) } return block } func (bc *BlockChain) BlockInfoByHash(hash []byte) BlockInfo { bi := BlockInfo{} data, _ := ethutil.Config.Db.Get(append(hash, []byte("Info")...)) bi.RlpDecode(data) return bi } func (bc *BlockChain) 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 *BlockChain) 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 *BlockChain) Stop() { if bc.CurrentBlock != nil { chainlogger.Infoln("Stopped") } }