// HashToUrl(contenthash) resolves the url for contenthash using UrlHint
// resolution is costless non-transactional
// implemented as direct retrieval from db
// if we use content addressed storage, this step is no longer necessary
func (self *Registrar) HashToUrl(chash common.Hash) (uri string, err error) {
if zero.MatchString(UrlHintAddr) {
return "", fmt.Errorf("UrlHint address is not set")
}
// look up in URL reg
var str string = " "
var idx uint32
for len(str) > 0 {
mapaddr := storageMapping(storageIdx2Addr(1), chash[:])
key := storageAddress(storageFixedArray(mapaddr, storageIdx2Addr(idx)))
hex := self.backend.StorageAt(UrlHintAddr[2:], key)
str = string(common.Hex2Bytes(hex[2:]))
l := 0
for (l < len(str)) && (str[l] == 0) {
l++
}
str = str[l:]
uri = uri + str
idx++
}
if len(uri) == 0 {
err = fmt.Errorf("HashToUrl: URL hint not found for '%v'", chash.Hex())
}
return
}
func (tx *Tx) UnmarshalJSON(b []byte) (err error) {
req := struct {
To common.Address `json:"to"`
From common.Address `json:"from"`
Nonce *rpc.HexNumber `json:"nonce"`
Value *rpc.HexNumber `json:"value"`
Data string `json:"data"`
GasLimit *rpc.HexNumber `json:"gas"`
GasPrice *rpc.HexNumber `json:"gasPrice"`
Hash common.Hash `json:"hash"`
}{}
if err := json.Unmarshal(b, &req); err != nil {
return err
}
contractCreation := (req.To == (common.Address{}))
tx.To = &req.To
tx.From = req.From
tx.Nonce = req.Nonce
tx.Value = req.Value
tx.Data = req.Data
tx.GasLimit = req.GasLimit
tx.GasPrice = req.GasPrice
tx.Hash = req.Hash
data := common.Hex2Bytes(tx.Data)
if tx.Nonce == nil {
return fmt.Errorf("need nonce")
}
if tx.Value == nil {
tx.Value = rpc.NewHexNumber(0)
}
if tx.GasLimit == nil {
tx.GasLimit = rpc.NewHexNumber(0)
}
if tx.GasPrice == nil {
tx.GasPrice = rpc.NewHexNumber(defaultGasPrice)
}
if contractCreation {
tx.tx = types.NewContractCreation(tx.Nonce.Uint64(), tx.Value.BigInt(), tx.GasLimit.BigInt(), tx.GasPrice.BigInt(), data)
} else {
if tx.To == nil {
return fmt.Errorf("need to address")
}
tx.tx = types.NewTransaction(tx.Nonce.Uint64(), *tx.To, tx.Value.BigInt(), tx.GasLimit.BigInt(), tx.GasPrice.BigInt(), data)
}
return nil
}
// Returns the unsigned version of i
func (i *Number) Uint256() *Number {
return Uint(0).Set(i)
}
// Returns the index of the first bit that's set to 1
func (i *Number) FirstBitSet() int {
for j := 0; j < i.num.BitLen(); j++ {
if i.num.Bit(j) > 0 {
return j
}
}
return i.num.BitLen()
}
// Variables
var (
Zero = Uint(0)
One = Uint(1)
Two = Uint(2)
MaxUint256 = Uint(0).SetBytes(common.Hex2Bytes("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"))
MinOne = Int(-1)
// "typedefs"
Uint = Uint256
Int = Int256
)
// WriteGenesisBlock writes the genesis block to the database as block number 0
func WriteGenesisBlock(chainDb ethdb.Database, reader io.Reader) (*types.Block, error) {
contents, err := ioutil.ReadAll(reader)
if err != nil {
return nil, err
}
var genesis struct {
Nonce string
Timestamp string
ParentHash string
ExtraData string
GasLimit string
Difficulty string
Mixhash string
Coinbase string
Alloc map[string]struct {
Code string
Storage map[string]string
Balance string
}
}
if err := json.Unmarshal(contents, &genesis); err != nil {
return nil, err
}
// creating with empty hash always works
statedb, _ := state.New(common.Hash{}, chainDb)
for addr, account := range genesis.Alloc {
address := common.HexToAddress(addr)
statedb.AddBalance(address, common.String2Big(account.Balance))
statedb.SetCode(address, common.Hex2Bytes(account.Code))
for key, value := range account.Storage {
statedb.SetState(address, common.HexToHash(key), common.HexToHash(value))
}
}
root, stateBatch := statedb.CommitBatch()
difficulty := common.String2Big(genesis.Difficulty)
block := types.NewBlock(&types.Header{
Nonce: types.EncodeNonce(common.String2Big(genesis.Nonce).Uint64()),
Time: common.String2Big(genesis.Timestamp),
ParentHash: common.HexToHash(genesis.ParentHash),
Extra: common.FromHex(genesis.ExtraData),
GasLimit: common.String2Big(genesis.GasLimit),
Difficulty: difficulty,
MixDigest: common.HexToHash(genesis.Mixhash),
Coinbase: common.HexToAddress(genesis.Coinbase),
Root: root,
}, nil, nil, nil)
if block := GetBlock(chainDb, block.Hash()); block != nil {
glog.V(logger.Info).Infoln("Genesis block already in chain. Writing canonical number")
err := WriteCanonicalHash(chainDb, block.Hash(), block.NumberU64())
if err != nil {
return nil, err
}
return block, nil
}
if err := stateBatch.Write(); err != nil {
return nil, fmt.Errorf("cannot write state: %v", err)
}
if err := WriteTd(chainDb, block.Hash(), difficulty); err != nil {
return nil, err
}
if err := WriteBlock(chainDb, block); err != nil {
return nil, err
}
if err := WriteBlockReceipts(chainDb, block.Hash(), nil); err != nil {
return nil, err
}
if err := WriteCanonicalHash(chainDb, block.Hash(), block.NumberU64()); err != nil {
return nil, err
}
if err := WriteHeadBlockHash(chainDb, block.Hash()); err != nil {
return nil, err
}
return block, nil
}