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508 lines
12 KiB
508 lines
12 KiB
package main
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import (
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"bytes"
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"errors"
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"fmt"
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"github.com/ethereum/ethutil-go"
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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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)
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type BlockChain struct {
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// Last block
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LastBlock *ethutil.Block
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// The famous, the fabulous Mister GENESIIIIIIS (block)
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genesisBlock *ethutil.Block
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// Last known total difficulty
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TD *big.Int
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}
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func NewBlockChain() *BlockChain {
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bc := &BlockChain{}
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bc.genesisBlock = ethutil.NewBlock(ethutil.Encode(ethutil.Genesis))
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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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// TODO get last block from the database
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bc.LastBlock = bc.genesisBlock
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return bc
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}
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func (bc *BlockChain) HasBlock(hash string) bool {
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data, _ := ethutil.Config.Db.Get([]byte(hash))
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return len(data) != 0
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}
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func (bc *BlockChain) GenesisBlock() *ethutil.Block {
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return bc.genesisBlock
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}
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type BlockManager struct {
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// The block chain :)
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bc *BlockChain
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// Last known block number
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LastBlockNumber *big.Int
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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]string
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}
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func NewBlockManager() *BlockManager {
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bm := &BlockManager{
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bc: NewBlockChain(),
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stack: NewStack(),
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mem: make(map[string]string),
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}
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// Set the last known block number based on the blockchains last
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// block
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bm.LastBlockNumber = bm.BlockInfo(bm.bc.LastBlock).Number
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return bm
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}
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// Process a block.
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func (bm *BlockManager) ProcessBlock(block *ethutil.Block) error {
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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(block); err != nil {
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return err
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}
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// Get the tx count. Used to create enough channels to 'join' the go routines
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txCount := len(block.Transactions())
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// Locking channel. When it has been fully buffered this method will return
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lockChan := make(chan bool, txCount)
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// Process each transaction/contract
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for _, tx := range block.Transactions() {
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// If there's no recipient, it's a contract
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if tx.IsContract() {
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go bm.ProcessContract(tx, block, lockChan)
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} else {
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// "finish" tx which isn't a contract
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lockChan <- true
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}
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}
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// Wait for all Tx to finish processing
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for i := 0; i < txCount; i++ {
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<-lockChan
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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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ethutil.Config.Db.Put(block.Hash(), block.RlpEncode())
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bm.bc.LastBlock = block
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}
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return nil
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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 (bm *BlockManager) writeBlockInfo(block *ethutil.Block) {
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bi := ethutil.BlockInfo{Number: bm.LastBlockNumber.Add(bm.LastBlockNumber, big.NewInt(1))}
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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 (bm *BlockManager) BlockInfo(block *ethutil.Block) ethutil.BlockInfo {
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bi := ethutil.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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func (bm *BlockManager) CalculateTD(block *ethutil.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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bm.bc.LastBlock = block
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// Set the new total difficulty back to the block chain
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bm.bc.TD = td
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if Debug {
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log.Println("TD(block) =", td)
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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 *ethutil.Block) error {
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// TODO
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// 2. Check if the difficulty is correct
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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.LastBlock != nil && block.PrevHash == "" &&
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!bm.bc.HasBlock(block.PrevHash) {
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return errors.New("Block's parent unknown")
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}
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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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for _, uncle := range block.Uncles {
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if uncle.PrevHash != block.PrevHash {
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if Debug {
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log.Printf("Uncle prvhash mismatch %x %x\n", block.PrevHash, uncle.PrevHash)
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}
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return errors.New("Mismatching Prvhash from uncle")
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}
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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.bc.LastBlock != nil && block.PrevHash == "" &&
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!DaggerVerify(ethutil.BigD(block.Hash()), block.Difficulty, block.Nonce) {
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return errors.New("Block's nonce is invalid")
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}
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log.Println("Block validation PASSED")
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return nil
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}
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func (bm *BlockManager) AccumelateRewards(block *ethutil.Block) error {
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// Get the coinbase rlp data
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d := block.State().Get(block.Coinbase)
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ether := ethutil.NewEtherFromData([]byte(d))
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// Reward amount of ether to the coinbase address
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ether.AddFee(ethutil.CalculateBlockReward(block, len(block.Uncles)))
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block.State().Update(block.Coinbase, string(ether.RlpEncode()))
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// TODO Reward each uncle
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return nil
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}
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func (bm *BlockManager) ProcessContract(tx *ethutil.Transaction, block *ethutil.Block, lockChan chan bool) {
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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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// Let the channel know where done even though it failed (so the execution may resume normally)
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lockChan <- true
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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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// Broadcast we're done
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lockChan <- true
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}
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// Contract evaluation is done here.
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func (bm *BlockManager) ProcContract(tx *ethutil.Transaction, block *ethutil.Block, cb TxCallback) {
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// Instruction pointer
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pc := 0
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blockInfo := bm.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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//fmt.Printf("# op arg\n")
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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 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.String())
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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.String())
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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.String())
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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.String())
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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.String())
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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.String())
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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.String())
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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.String())
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case oNEG:
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base.Sub(Pow256, ethutil.Big(bm.stack.Pop()))
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bm.stack.Push(base.String())
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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("1")
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} else {
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bm.stack.Push("0")
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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("1")
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} else {
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bm.stack.Push("0")
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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("1")
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} else {
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bm.stack.Push("0")
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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("1")
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} else {
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bm.stack.Push("0")
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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("1")
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} else {
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bm.stack.Push("0")
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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(string(tx.Hash()))
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case oTXSENDER:
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bm.stack.Push(string(tx.Sender()))
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case oTXVALUE:
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bm.stack.Push(tx.Value.String())
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case oTXDATAN:
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bm.stack.Push(big.NewInt(int64(len(tx.Data))).String())
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case oTXDATA:
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v := ethutil.Big(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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//I know this will change. It makes no
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//sense. Read comment above
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bm.stack.Push(ethutil.Big("0").String())
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} else {
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bm.stack.Push(ethutil.Big(tx.Data[v.Uint64()]).String())
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}
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case oBLK_PREVHASH:
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bm.stack.Push(string(block.PrevHash))
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case oBLK_COINBASE:
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bm.stack.Push(block.Coinbase)
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case oBLK_TIMESTAMP:
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bm.stack.Push(big.NewInt(block.Time).String())
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case oBLK_NUMBER:
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bm.stack.Push(blockInfo.Number.String())
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case oBLK_DIFFICULTY:
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bm.stack.Push(block.Difficulty.String())
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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.String())
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case oSHA256, 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(ethutil.Big(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(ethutil.Big(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())).String())
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} else {
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bm.stack.Push(base.SetBytes(ethutil.Ripemd160(data.Bytes())).String())
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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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//if ethutil.Big(x).Cmp(ethutil.Big(y)) {
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data := new(bytes.Buffer)
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data.WriteString(x)
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data.WriteString(y)
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if secp256k1.VerifyPubkeyValidity(data.Bytes()) == 1 {
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// TODO
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} else {
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// Invalid, push infinity
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bm.stack.Push("0")
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bm.stack.Push("0")
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}
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//} else {
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// // Invalid, push infinity
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// bm.stack.Push("0")
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// bm.stack.Push("0")
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//}
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case oECADD:
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case oECSIGN:
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case oECRECOVER:
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case oECVALID:
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case oSHA3:
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case oPUSH:
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// Get the next entry and pushes the value on the stack
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pc++
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bm.stack.Push(contract.State().Get(string(ethutil.NumberToBytes(uint64(pc), 32))))
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case oPOP:
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// Pop current value of the stack
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bm.stack.Pop()
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case oDUP:
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case oSWAP:
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case oMLOAD:
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case oMSTORE:
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case oSLOAD:
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case oSSTORE:
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case oJMP:
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case oJMPI:
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case oIND:
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case oEXTRO:
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case oBALANCE:
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case oMKTX:
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case oSUICIDE:
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/*
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case oLOAD:
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// Load instruction X on the stack
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i, _ := strconv.Atoi(bm.stack.Pop())
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bm.stack.Push(contract.State().Get(string(ethutil.NumberToBytes(uint64(i), 32))))
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*/
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}
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pc++
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}
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bm.stack.Print()
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}
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