// 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
}
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())
}
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())}
}
