641 lines
16 KiB
Go
641 lines
16 KiB
Go
package ethchain
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import (
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"bytes"
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"encoding/hex"
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"fmt"
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"github.com/ethereum/eth-go/ethutil"
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"github.com/ethereum/eth-go/ethwire"
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"github.com/obscuren/secp256k1-go"
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"log"
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"math"
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"math/big"
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"strconv"
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"sync"
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"time"
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)
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type BlockProcessor interface {
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ProcessBlock(block *Block)
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}
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type BlockManager struct {
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// Mutex for locking the block processor. Blocks can only be handled one at a time
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mutex sync.Mutex
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// The block chain :)
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bc *BlockChain
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// Stack for processing contracts
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stack *Stack
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// non-persistent key/value memory storage
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mem map[string]*big.Int
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TransactionPool *TxPool
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Pow PoW
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Speaker PublicSpeaker
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SecondaryBlockProcessor BlockProcessor
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}
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func AddTestNetFunds(block *Block) {
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for _, addr := range []string{
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"8a40bfaa73256b60764c1bf40675a99083efb075", // Gavin
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"e6716f9544a56c530d868e4bfbacb172315bdead", // Jeffrey
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"1e12515ce3e0f817a4ddef9ca55788a1d66bd2df", // Vit
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"1a26338f0d905e295fccb71fa9ea849ffa12aaf4", // Alex
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} {
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//log.Println("2^200 Wei to", addr)
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codedAddr, _ := hex.DecodeString(addr)
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addr := block.GetAddr(codedAddr)
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addr.Amount = ethutil.BigPow(2, 200)
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block.UpdateAddr(codedAddr, addr)
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}
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}
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func NewBlockManager(speaker PublicSpeaker) *BlockManager {
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bm := &BlockManager{
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//server: s,
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bc: NewBlockChain(),
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stack: NewStack(),
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mem: make(map[string]*big.Int),
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Pow: &EasyPow{},
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Speaker: speaker,
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}
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if bm.bc.CurrentBlock == nil {
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AddTestNetFunds(bm.bc.genesisBlock)
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bm.bc.genesisBlock.State().Sync()
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// Prepare the genesis block
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bm.bc.Add(bm.bc.genesisBlock)
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//log.Printf("root %x\n", bm.bc.genesisBlock.State().Root)
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//bm.bc.genesisBlock.PrintHash()
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}
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log.Printf("Last block: %x\n", bm.bc.CurrentBlock.Hash())
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return bm
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}
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func (bm *BlockManager) BlockChain() *BlockChain {
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return bm.bc
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}
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func (bm *BlockManager) ApplyTransactions(block *Block, txs []*Transaction) {
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// Process each transaction/contract
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for _, tx := range txs {
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// If there's no recipient, it's a contract
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if tx.IsContract() {
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block.MakeContract(tx)
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bm.ProcessContract(tx, block)
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} else {
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bm.TransactionPool.ProcessTransaction(tx, block)
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}
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}
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}
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// Block processing and validating with a given (temporarily) state
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func (bm *BlockManager) ProcessBlock(block *Block) error {
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// Processing a blocks may never happen simultaneously
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bm.mutex.Lock()
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defer bm.mutex.Unlock()
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// Defer the Undo on the Trie. If the block processing happened
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// we don't want to undo but since undo only happens on dirty
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// nodes this won't happen because Commit would have been called
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// before that.
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defer bm.bc.CurrentBlock.State().Undo()
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hash := block.Hash()
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if bm.bc.HasBlock(hash) {
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return nil
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}
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// Check if we have the parent hash, if it isn't known we discard it
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// Reasons might be catching up or simply an invalid block
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if !bm.bc.HasBlock(block.PrevHash) && bm.bc.CurrentBlock != nil {
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return ParentError(block.PrevHash)
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}
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// Process the transactions on to current block
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bm.ApplyTransactions(bm.bc.CurrentBlock, block.Transactions())
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// Block validation
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if err := bm.ValidateBlock(block); err != nil {
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return err
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}
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// I'm not sure, but I don't know if there should be thrown
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// any errors at this time.
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if err := bm.AccumelateRewards(bm.bc.CurrentBlock, block); err != nil {
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return err
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}
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if !block.State().Cmp(bm.bc.CurrentBlock.State()) {
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return fmt.Errorf("Invalid merkle root. Expected %x, got %x", block.State().Root, bm.bc.CurrentBlock.State().Root)
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}
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// Calculate the new total difficulty and sync back to the db
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if bm.CalculateTD(block) {
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// Sync the current block's state to the database and cancelling out the deferred Undo
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bm.bc.CurrentBlock.State().Sync()
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// Add the block to the chain
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bm.bc.Add(block)
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/*
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ethutil.Config.Db.Put(block.Hash(), block.RlpEncode())
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bm.bc.CurrentBlock = block
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bm.LastBlockHash = block.Hash()
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bm.writeBlockInfo(block)
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*/
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/*
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txs := bm.TransactionPool.Flush()
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var coded = []interface{}{}
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for _, tx := range txs {
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err := bm.TransactionPool.ValidateTransaction(tx)
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if err == nil {
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coded = append(coded, tx.RlpEncode())
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}
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}
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*/
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// Broadcast the valid block back to the wire
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bm.Speaker.Broadcast(ethwire.MsgBlockTy, []interface{}{block.Value().Val})
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// If there's a block processor present, pass in the block for further
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// processing
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if bm.SecondaryBlockProcessor != nil {
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bm.SecondaryBlockProcessor.ProcessBlock(block)
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}
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log.Printf("[BMGR] Added block #%d (%x)\n", block.BlockInfo().Number, block.Hash())
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} else {
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fmt.Println("total diff failed")
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}
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return nil
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}
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func (bm *BlockManager) CalculateTD(block *Block) bool {
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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(genesis_block) = 0 and TD(B) = TD(B.parent) + sum(u.difficulty for u in B.uncles) + B.difficulty
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td := new(big.Int)
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td = td.Add(bm.bc.TD, uncleDiff)
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td = td.Add(td, block.Difficulty)
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// The new TD will only be accepted if the new difficulty is
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// is greater than the previous.
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if td.Cmp(bm.bc.TD) > 0 {
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// Set the new total difficulty back to the block chain
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bm.bc.SetTotalDifficulty(td)
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/*
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if ethutil.Config.Debug {
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log.Println("[BMGR] TD(block) =", td)
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}
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*/
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return true
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}
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return false
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}
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// Validates the current block. Returns an error if the block was invalid,
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// an uncle or anything that isn't on the current block chain.
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// Validation validates easy over difficult (dagger takes longer time = difficult)
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func (bm *BlockManager) ValidateBlock(block *Block) error {
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// TODO
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// 2. Check if the difficulty is correct
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// Check each uncle's previous hash. In order for it to be valid
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// is if it has the same block hash as the current
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previousBlock := bm.bc.GetBlock(block.PrevHash)
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for _, uncle := range block.Uncles {
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if bytes.Compare(uncle.PrevHash, previousBlock.PrevHash) != 0 {
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return ValidationError("Mismatch uncle's previous hash. Expected %x, got %x", previousBlock.PrevHash, uncle.PrevHash)
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}
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}
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diff := block.Time - bm.bc.CurrentBlock.Time
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if diff < 0 {
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return ValidationError("Block timestamp less then prev block %v", diff)
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}
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// New blocks must be within the 15 minute range of the last block.
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if diff > int64(15*time.Minute) {
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return ValidationError("Block is too far in the future of last block (> 15 minutes)")
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}
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// Verify the nonce of the block. Return an error if it's not valid
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if !bm.Pow.Verify(block.HashNoNonce(), block.Difficulty, block.Nonce) {
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return ValidationError("Block's nonce is invalid (= %v)", block.Nonce)
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}
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return nil
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}
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func CalculateBlockReward(block *Block, uncleLength int) *big.Int {
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base := new(big.Int)
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for i := 0; i < uncleLength; i++ {
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base.Add(base, UncleInclusionReward)
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}
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return base.Add(base, BlockReward)
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}
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func CalculateUncleReward(block *Block) *big.Int {
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return UncleReward
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}
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func (bm *BlockManager) AccumelateRewards(processor *Block, block *Block) error {
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// Get the coinbase rlp data
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addr := processor.GetAddr(block.Coinbase)
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// Reward amount of ether to the coinbase address
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addr.AddFee(CalculateBlockReward(block, len(block.Uncles)))
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processor.UpdateAddr(block.Coinbase, addr)
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for _, uncle := range block.Uncles {
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uncleAddr := processor.GetAddr(uncle.Coinbase)
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uncleAddr.AddFee(CalculateUncleReward(uncle))
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processor.UpdateAddr(uncle.Coinbase, uncleAddr)
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}
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return nil
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}
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func (bm *BlockManager) Stop() {
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bm.bc.Stop()
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}
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func (bm *BlockManager) ProcessContract(tx *Transaction, block *Block) {
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// Recovering function in case the VM had any errors
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defer func() {
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if r := recover(); r != nil {
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fmt.Println("Recovered from VM execution with err =", r)
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}
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}()
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// Process contract
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bm.ProcContract(tx, block, func(opType OpType) bool {
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// TODO turn on once big ints are in place
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//if !block.PayFee(tx.Hash(), StepFee.Uint64()) {
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// return false
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//}
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return true // Continue
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})
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}
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// Contract evaluation is done here.
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func (bm *BlockManager) ProcContract(tx *Transaction, block *Block, cb TxCallback) {
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// Instruction pointer
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pc := 0
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blockInfo := bm.bc.BlockInfo(block)
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contract := block.GetContract(tx.Hash())
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if contract == nil {
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fmt.Println("Contract not found")
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return
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}
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Pow256 := ethutil.BigPow(2, 256)
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if ethutil.Config.Debug {
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fmt.Printf("# op arg\n")
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}
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out:
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for {
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// The base big int for all calculations. Use this for any results.
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base := new(big.Int)
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// XXX Should Instr return big int slice instead of string slice?
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// Get the next instruction from the contract
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//op, _, _ := Instr(contract.state.Get(string(Encode(uint32(pc)))))
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nb := ethutil.NumberToBytes(uint64(pc), 32)
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o, _, _ := ethutil.Instr(contract.State().Get(string(nb)))
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op := OpCode(o)
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if !cb(0) {
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break
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}
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if ethutil.Config.Debug {
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fmt.Printf("%-3d %-4s\n", pc, op.String())
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}
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switch op {
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case oSTOP:
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break out
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case oADD:
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x, y := bm.stack.Popn()
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// (x + y) % 2 ** 256
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base.Add(x, y)
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base.Mod(base, Pow256)
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// Pop result back on the stack
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bm.stack.Push(base)
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case oSUB:
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x, y := bm.stack.Popn()
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// (x - y) % 2 ** 256
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base.Sub(x, y)
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base.Mod(base, Pow256)
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// Pop result back on the stack
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bm.stack.Push(base)
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case oMUL:
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x, y := bm.stack.Popn()
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// (x * y) % 2 ** 256
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base.Mul(x, y)
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base.Mod(base, Pow256)
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// Pop result back on the stack
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bm.stack.Push(base)
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case oDIV:
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x, y := bm.stack.Popn()
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// floor(x / y)
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base.Div(x, y)
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// Pop result back on the stack
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bm.stack.Push(base)
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case oSDIV:
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x, y := bm.stack.Popn()
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// n > 2**255
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if x.Cmp(Pow256) > 0 {
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x.Sub(Pow256, x)
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}
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if y.Cmp(Pow256) > 0 {
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y.Sub(Pow256, y)
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}
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z := new(big.Int)
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z.Div(x, y)
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if z.Cmp(Pow256) > 0 {
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z.Sub(Pow256, z)
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}
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// Push result on to the stack
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bm.stack.Push(z)
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case oMOD:
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x, y := bm.stack.Popn()
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base.Mod(x, y)
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bm.stack.Push(base)
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case oSMOD:
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x, y := bm.stack.Popn()
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// n > 2**255
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if x.Cmp(Pow256) > 0 {
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x.Sub(Pow256, x)
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}
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if y.Cmp(Pow256) > 0 {
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y.Sub(Pow256, y)
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}
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z := new(big.Int)
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z.Mod(x, y)
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if z.Cmp(Pow256) > 0 {
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z.Sub(Pow256, z)
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}
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// Push result on to the stack
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bm.stack.Push(z)
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case oEXP:
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x, y := bm.stack.Popn()
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base.Exp(x, y, Pow256)
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bm.stack.Push(base)
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case oNEG:
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base.Sub(Pow256, bm.stack.Pop())
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bm.stack.Push(base)
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case oLT:
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x, y := bm.stack.Popn()
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// x < y
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if x.Cmp(y) < 0 {
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bm.stack.Push(ethutil.BigTrue)
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} else {
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bm.stack.Push(ethutil.BigFalse)
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}
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case oLE:
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x, y := bm.stack.Popn()
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// x <= y
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if x.Cmp(y) < 1 {
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bm.stack.Push(ethutil.BigTrue)
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} else {
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bm.stack.Push(ethutil.BigFalse)
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}
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case oGT:
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x, y := bm.stack.Popn()
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// x > y
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if x.Cmp(y) > 0 {
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bm.stack.Push(ethutil.BigTrue)
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} else {
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bm.stack.Push(ethutil.BigFalse)
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}
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case oGE:
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x, y := bm.stack.Popn()
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// x >= y
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if x.Cmp(y) > -1 {
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bm.stack.Push(ethutil.BigTrue)
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} else {
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bm.stack.Push(ethutil.BigFalse)
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}
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case oNOT:
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x, y := bm.stack.Popn()
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// x != y
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if x.Cmp(y) != 0 {
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bm.stack.Push(ethutil.BigTrue)
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} else {
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bm.stack.Push(ethutil.BigFalse)
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}
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// Please note that the following code contains some
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// ugly string casting. This will have to change to big
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// ints. TODO :)
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case oMYADDRESS:
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bm.stack.Push(ethutil.BigD(tx.Hash()))
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case oTXSENDER:
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bm.stack.Push(ethutil.BigD(tx.Sender()))
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case oTXVALUE:
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bm.stack.Push(tx.Value)
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case oTXDATAN:
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bm.stack.Push(big.NewInt(int64(len(tx.Data))))
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case oTXDATA:
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v := bm.stack.Pop()
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// v >= len(data)
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if v.Cmp(big.NewInt(int64(len(tx.Data)))) >= 0 {
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bm.stack.Push(ethutil.Big("0"))
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} else {
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bm.stack.Push(ethutil.Big(tx.Data[v.Uint64()]))
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}
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case oBLK_PREVHASH:
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bm.stack.Push(ethutil.BigD(block.PrevHash))
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case oBLK_COINBASE:
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bm.stack.Push(ethutil.BigD(block.Coinbase))
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case oBLK_TIMESTAMP:
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bm.stack.Push(big.NewInt(block.Time))
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case oBLK_NUMBER:
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bm.stack.Push(big.NewInt(int64(blockInfo.Number)))
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case oBLK_DIFFICULTY:
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bm.stack.Push(block.Difficulty)
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case oBASEFEE:
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// e = 10^21
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e := big.NewInt(0).Exp(big.NewInt(10), big.NewInt(21), big.NewInt(0))
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d := new(big.Rat)
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d.SetInt(block.Difficulty)
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c := new(big.Rat)
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c.SetFloat64(0.5)
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// d = diff / 0.5
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d.Quo(d, c)
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// base = floor(d)
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base.Div(d.Num(), d.Denom())
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x := new(big.Int)
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x.Div(e, base)
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// x = floor(10^21 / floor(diff^0.5))
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bm.stack.Push(x)
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case oSHA256, oSHA3, oRIPEMD160:
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// This is probably save
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// ceil(pop / 32)
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length := int(math.Ceil(float64(bm.stack.Pop().Uint64()) / 32.0))
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// New buffer which will contain the concatenated popped items
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data := new(bytes.Buffer)
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for i := 0; i < length; i++ {
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// Encode the number to bytes and have it 32bytes long
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num := ethutil.NumberToBytes(bm.stack.Pop().Bytes(), 256)
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data.WriteString(string(num))
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}
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if op == oSHA256 {
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bm.stack.Push(base.SetBytes(ethutil.Sha256Bin(data.Bytes())))
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} else if op == oSHA3 {
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bm.stack.Push(base.SetBytes(ethutil.Sha3Bin(data.Bytes())))
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} else {
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bm.stack.Push(base.SetBytes(ethutil.Ripemd160(data.Bytes())))
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}
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case oECMUL:
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y := bm.stack.Pop()
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x := bm.stack.Pop()
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//n := bm.stack.Pop()
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|
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//if ethutil.Big(x).Cmp(ethutil.Big(y)) {
|
|
data := new(bytes.Buffer)
|
|
data.WriteString(x.String())
|
|
data.WriteString(y.String())
|
|
if secp256k1.VerifyPubkeyValidity(data.Bytes()) == 1 {
|
|
// TODO
|
|
} else {
|
|
// Invalid, push infinity
|
|
bm.stack.Push(ethutil.Big("0"))
|
|
bm.stack.Push(ethutil.Big("0"))
|
|
}
|
|
//} else {
|
|
// // Invalid, push infinity
|
|
// bm.stack.Push("0")
|
|
// bm.stack.Push("0")
|
|
//}
|
|
|
|
case oECADD:
|
|
case oECSIGN:
|
|
case oECRECOVER:
|
|
case oECVALID:
|
|
case oPUSH:
|
|
pc++
|
|
bm.stack.Push(bm.mem[strconv.Itoa(pc)])
|
|
case oPOP:
|
|
// Pop current value of the stack
|
|
bm.stack.Pop()
|
|
case oDUP:
|
|
// Dup top stack
|
|
x := bm.stack.Pop()
|
|
bm.stack.Push(x)
|
|
bm.stack.Push(x)
|
|
case oSWAP:
|
|
// Swap two top most values
|
|
x, y := bm.stack.Popn()
|
|
bm.stack.Push(y)
|
|
bm.stack.Push(x)
|
|
case oMLOAD:
|
|
x := bm.stack.Pop()
|
|
bm.stack.Push(bm.mem[x.String()])
|
|
case oMSTORE:
|
|
x, y := bm.stack.Popn()
|
|
bm.mem[x.String()] = y
|
|
case oSLOAD:
|
|
// Load the value in storage and push it on the stack
|
|
x := bm.stack.Pop()
|
|
// decode the object as a big integer
|
|
decoder := ethutil.NewValueFromBytes([]byte(contract.State().Get(x.String())))
|
|
if !decoder.IsNil() {
|
|
bm.stack.Push(decoder.BigInt())
|
|
} else {
|
|
bm.stack.Push(ethutil.BigFalse)
|
|
}
|
|
case oSSTORE:
|
|
// Store Y at index X
|
|
x, y := bm.stack.Popn()
|
|
contract.State().Update(x.String(), string(ethutil.Encode(y)))
|
|
case oJMP:
|
|
x := int(bm.stack.Pop().Uint64())
|
|
// Set pc to x - 1 (minus one so the incrementing at the end won't effect it)
|
|
pc = x
|
|
pc--
|
|
case oJMPI:
|
|
x := bm.stack.Pop()
|
|
// Set pc to x if it's non zero
|
|
if x.Cmp(ethutil.BigFalse) != 0 {
|
|
pc = int(x.Uint64())
|
|
pc--
|
|
}
|
|
case oIND:
|
|
bm.stack.Push(big.NewInt(int64(pc)))
|
|
case oEXTRO:
|
|
memAddr := bm.stack.Pop()
|
|
contractAddr := bm.stack.Pop().Bytes()
|
|
|
|
// Push the contract's memory on to the stack
|
|
bm.stack.Push(getContractMemory(block, contractAddr, memAddr))
|
|
case oBALANCE:
|
|
// Pushes the balance of the popped value on to the stack
|
|
d := block.State().Get(bm.stack.Pop().String())
|
|
ether := NewAddressFromData([]byte(d))
|
|
bm.stack.Push(ether.Amount)
|
|
case oMKTX:
|
|
value, addr := bm.stack.Popn()
|
|
from, length := bm.stack.Popn()
|
|
|
|
j := 0
|
|
dataItems := make([]string, int(length.Uint64()))
|
|
for i := from.Uint64(); i < length.Uint64(); i++ {
|
|
dataItems[j] = string(bm.mem[strconv.Itoa(int(i))].Bytes())
|
|
j++
|
|
}
|
|
// TODO sign it?
|
|
tx := NewTransaction(addr.Bytes(), value, dataItems)
|
|
// Add the transaction to the tx pool
|
|
bm.TransactionPool.QueueTransaction(tx)
|
|
case oSUICIDE:
|
|
//addr := bm.stack.Pop()
|
|
}
|
|
pc++
|
|
}
|
|
}
|
|
|
|
// Returns an address from the specified contract's address
|
|
func getContractMemory(block *Block, contractAddr []byte, memAddr *big.Int) *big.Int {
|
|
contract := block.GetContract(contractAddr)
|
|
if contract == nil {
|
|
log.Panicf("invalid contract addr %x", contractAddr)
|
|
}
|
|
val := contract.State().Get(memAddr.String())
|
|
|
|
// decode the object as a big integer
|
|
decoder := ethutil.NewValueFromBytes([]byte(val))
|
|
if decoder.IsNil() {
|
|
return ethutil.BigFalse
|
|
}
|
|
|
|
return decoder.BigInt()
|
|
}
|