Exemplo n.º 1
0
// Validates the current block. Returns an error if the block was invalid,
// an uncle or anything that isn't on the current block chain.
// Validation validates easy over difficult (dagger takes longer time = difficult)
func (sm *StateManager) ValidateBlock(block *Block) error {
	// TODO
	// 2. Check if the difficulty is correct

	// Check each uncle's previous hash. In order for it to be valid
	// is if it has the same block hash as the current
	previousBlock := sm.bc.GetBlock(block.PrevHash)
	for _, uncle := range block.Uncles {
		if bytes.Compare(uncle.PrevHash, previousBlock.PrevHash) != 0 {
			return ValidationError("Mismatch uncle's previous hash. Expected %x, got %x", previousBlock.PrevHash, uncle.PrevHash)
		}
	}

	diff := block.Time - sm.bc.CurrentBlock.Time
	if diff < 0 {
		return ValidationError("Block timestamp less then prev block %v", diff)
	}

	// New blocks must be within the 15 minute range of the last block.
	if diff > int64(15*time.Minute) {
		return ValidationError("Block is too far in the future of last block (> 15 minutes)")
	}

	// Verify the nonce of the block. Return an error if it's not valid
	if !sm.Pow.Verify(block.HashNoNonce(), block.Difficulty, block.Nonce) {
		return ValidationError("Block's nonce is invalid (= %v)", ethutil.Hex(block.Nonce))
	}

	return nil
}
Exemplo n.º 2
0
func (lib *EthLib) CreateTx(receiver, a, data string) string {
	var hash []byte
	if len(receiver) == 0 {
		hash = ethchain.ContractAddr
	} else {
		var err error
		hash, err = hex.DecodeString(receiver)
		if err != nil {
			return err.Error()
		}
	}

	k, _ := ethutil.Config.Db.Get([]byte("KeyRing"))
	keyPair := ethutil.NewKeyFromBytes(k)

	amount := ethutil.Big(a)
	code := ethchain.Compile(strings.Split(data, "\n"))
	tx := ethchain.NewTransaction(hash, amount, code)
	tx.Nonce = lib.stateManager.GetAddrState(keyPair.Address()).Nonce

	tx.Sign(keyPair.PrivateKey)

	lib.txPool.QueueTransaction(tx)

	if len(receiver) == 0 {
		ethutil.Config.Log.Infof("Contract addr %x", tx.Hash()[12:])
	} else {
		ethutil.Config.Log.Infof("Tx hash %x", tx.Hash())
	}

	return ethutil.Hex(tx.Hash())
}
Exemplo n.º 3
0
func (lib *EthLib) GetBlock(hexHash string) *Block {
	hash, err := hex.DecodeString(hexHash)
	if err != nil {
		return nil
	}

	block := lib.blockChain.GetBlock(hash)
	fmt.Println(block)

	return &Block{Number: int(block.BlockInfo().Number), Hash: ethutil.Hex(block.Hash())}
}