292 lines
6.9 KiB
Go
292 lines
6.9 KiB
Go
package ethchain
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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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"github.com/ethereum/go-ethereum/ethlog"
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"github.com/ethereum/go-ethereum/ethutil"
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)
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var chainlogger = ethlog.NewLogger("CHAIN")
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type ChainManager struct {
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Ethereum EthManager
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// The famous, the fabulous Mister GENESIIIIIIS (block)
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genesisBlock *Block
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// Last known total difficulty
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TD *big.Int
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LastBlockNumber uint64
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CurrentBlock *Block
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LastBlockHash []byte
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}
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func NewChainManager(ethereum EthManager) *ChainManager {
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bc := &ChainManager{}
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bc.genesisBlock = NewBlockFromBytes(ethutil.Encode(Genesis))
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bc.Ethereum = ethereum
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bc.setLastBlock()
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return bc
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}
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func (bc *ChainManager) Genesis() *Block {
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return bc.genesisBlock
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}
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func (bc *ChainManager) NewBlock(coinbase []byte) *Block {
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var root interface{}
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hash := ZeroHash256
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if bc.CurrentBlock != nil {
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root = bc.CurrentBlock.state.Trie.Root
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hash = bc.LastBlockHash
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}
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block := CreateBlock(
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root,
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hash,
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coinbase,
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ethutil.BigPow(2, 32),
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nil,
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"")
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block.MinGasPrice = big.NewInt(10000000000000)
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parent := bc.CurrentBlock
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if parent != nil {
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block.Difficulty = CalcDifficulty(block, parent)
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block.Number = new(big.Int).Add(bc.CurrentBlock.Number, ethutil.Big1)
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block.GasLimit = block.CalcGasLimit(bc.CurrentBlock)
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}
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return block
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}
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func CalcDifficulty(block, parent *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+5 {
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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 (bc *ChainManager) Reset() {
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AddTestNetFunds(bc.genesisBlock)
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bc.genesisBlock.state.Trie.Sync()
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// Prepare the genesis block
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bc.Add(bc.genesisBlock)
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fk := append([]byte("bloom"), bc.genesisBlock.Hash()...)
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bc.Ethereum.Db().Put(fk, make([]byte, 255))
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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)
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bc.TD = ethutil.BigD(ethutil.Config.Db.LastKnownTD())
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}
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func (bc *ChainManager) HasBlock(hash []byte) bool {
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data, _ := ethutil.Config.Db.Get(hash)
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return len(data) != 0
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}
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// TODO: At one point we might want to save a block by prevHash in the db to optimise this...
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func (bc *ChainManager) HasBlockWithPrevHash(hash []byte) bool {
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block := bc.CurrentBlock
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for ; block != nil; block = bc.GetBlock(block.PrevHash) {
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if bytes.Compare(hash, block.PrevHash) == 0 {
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return true
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}
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}
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return false
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}
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func (bc *ChainManager) CalculateBlockTD(block *Block) *big.Int {
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blockDiff := new(big.Int)
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for _, uncle := range block.Uncles {
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blockDiff = blockDiff.Add(blockDiff, uncle.Difficulty)
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}
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blockDiff = blockDiff.Add(blockDiff, block.Difficulty)
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return blockDiff
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}
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func (bc *ChainManager) GenesisBlock() *Block {
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return bc.genesisBlock
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}
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func (self *ChainManager) GetChainHashesFromHash(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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chain = append(chain, block.Hash())
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if block.Number.Cmp(ethutil.Big0) <= 0 {
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break
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}
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block = self.GetBlock(block.PrevHash)
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}
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return
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}
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func AddTestNetFunds(block *Block) {
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for _, addr := range []string{
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"51ba59315b3a95761d0863b05ccc7a7f54703d99",
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"e4157b34ea9615cfbde6b4fda419828124b70c78",
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"b9c015918bdaba24b4ff057a92a3873d6eb201be",
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"6c386a4b26f73c802f34673f7248bb118f97424a",
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"cd2a3d9f938e13cd947ec05abc7fe734df8dd826",
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"2ef47100e0787b915105fd5e3f4ff6752079d5cb",
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"e6716f9544a56c530d868e4bfbacb172315bdead",
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"1a26338f0d905e295fccb71fa9ea849ffa12aaf4",
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} {
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codedAddr := ethutil.Hex2Bytes(addr)
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account := block.state.GetAccount(codedAddr)
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account.SetBalance(ethutil.Big("1606938044258990275541962092341162602522202993782792835301376")) //ethutil.BigPow(2, 200)
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block.state.UpdateStateObject(account)
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}
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}
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func (bc *ChainManager) setLastBlock() {
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data, _ := ethutil.Config.Db.Get([]byte("LastBlock"))
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if len(data) != 0 {
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// Prep genesis
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AddTestNetFunds(bc.genesisBlock)
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block := NewBlockFromBytes(data)
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bc.CurrentBlock = block
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bc.LastBlockHash = block.Hash()
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bc.LastBlockNumber = block.Number.Uint64()
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// Set the last know difficulty (might be 0x0 as initial value, Genesis)
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bc.TD = ethutil.BigD(ethutil.Config.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 (#%d) %x\n", bc.LastBlockNumber, bc.CurrentBlock.Hash())
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}
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func (bc *ChainManager) SetTotalDifficulty(td *big.Int) {
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ethutil.Config.Db.Put([]byte("LTD"), td.Bytes())
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bc.TD = td
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}
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// Add a block to the chain and record addition information
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func (bc *ChainManager) Add(block *Block) {
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bc.writeBlockInfo(block)
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// Prepare the genesis block
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bc.CurrentBlock = block
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bc.LastBlockHash = block.Hash()
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encodedBlock := block.RlpEncode()
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ethutil.Config.Db.Put(block.Hash(), encodedBlock)
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ethutil.Config.Db.Put([]byte("LastBlock"), encodedBlock)
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}
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func (self *ChainManager) CalcTotalDiff(block *Block) (*big.Int, error) {
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parent := self.GetBlock(block.PrevHash)
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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.PrevHash)
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}
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parentTd := parent.BlockInfo().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.Difficulty)
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return td, nil
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}
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func (bc *ChainManager) GetBlock(hash []byte) *Block {
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data, _ := ethutil.Config.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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return NewBlockFromBytes(data)
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}
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func (self *ChainManager) GetBlockByNumber(num uint64) *Block {
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block := self.CurrentBlock
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for ; block != nil; block = self.GetBlock(block.PrevHash) {
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if block.Number.Uint64() == num {
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break
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}
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}
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if block != nil && block.Number.Uint64() == 0 && num != 0 {
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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) GetBlockBack(num uint64) *Block {
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block := self.CurrentBlock
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for ; num != 0 && block != nil; num-- {
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block = self.GetBlock(block.PrevHash)
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}
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return block
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}
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func (bc *ChainManager) BlockInfoByHash(hash []byte) BlockInfo {
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bi := BlockInfo{}
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data, _ := ethutil.Config.Db.Get(append(hash, []byte("Info")...))
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bi.RlpDecode(data)
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return bi
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}
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func (bc *ChainManager) BlockInfo(block *Block) BlockInfo {
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bi := BlockInfo{}
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data, _ := ethutil.Config.Db.Get(append(block.Hash(), []byte("Info")...))
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bi.RlpDecode(data)
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return bi
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}
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// Unexported method for writing extra non-essential block info to the db
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func (bc *ChainManager) writeBlockInfo(block *Block) {
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bc.LastBlockNumber++
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bi := 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
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ethutil.Config.Db.Put(append(block.Hash(), []byte("Info")...), bi.RlpEncode())
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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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