mirror of
https://gitlab.com/pulsechaincom/go-pulse.git
synced 2024-12-24 12:27:17 +00:00
313 lines
8.3 KiB
Go
313 lines
8.3 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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"log"
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"math/big"
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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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// TODO rename to state manager
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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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// States for addresses. You can watch any address
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// at any given time
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addrStateStore *AddrStateStore
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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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addrStateStore: NewAddrStateStore(),
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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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// Watches any given address and puts it in the address state store
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func (bm *BlockManager) WatchAddr(addr []byte) *AddressState {
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account := bm.bc.CurrentBlock.GetAddr(addr)
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return bm.addrStateStore.Add(addr, account)
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}
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func (bm *BlockManager) GetAddrState(addr []byte) *AddressState {
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account := bm.addrStateStore.Get(addr)
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if account == nil {
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a := bm.bc.CurrentBlock.GetAddr(addr)
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account = &AddressState{Nonce: a.Nonce, Account: a}
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}
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return account
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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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} else {
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if contract := block.GetContract(tx.Recipient); contract != nil {
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bm.ProcessContract(contract, tx, block)
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} else {
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err := bm.TransactionPool.ProcessTransaction(tx, block)
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if err != nil {
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ethutil.Config.Log.Infoln("[BMGR]", err)
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}
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}
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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.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.Sync()
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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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// Add the block to the chain
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bm.bc.Add(block)
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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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ethutil.Config.Log.Infof("[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(contract *Contract, tx *Transaction, block *Block) {
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// Recovering function in case the VM had any errors
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/*
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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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*/
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vm := &Vm{}
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vm.Process(contract, NewState(block.state), RuntimeVars{
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address: tx.Hash()[12:],
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blockNumber: block.BlockInfo().Number,
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sender: tx.Sender(),
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prevHash: block.PrevHash,
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coinbase: block.Coinbase,
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time: block.Time,
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diff: block.Difficulty,
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txValue: tx.Value,
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txData: tx.Data,
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})
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}
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