// Call forms a transaction from the given arguments and tries to execute it on
// a private VM with a copy of the state. Any changes are therefore only temporary
// and not part of the actual state. This allows for local execution/queries.
func (be *registryAPIBackend) Call(fromStr, toStr, valueStr, gasStr, gasPriceStr, dataStr string) (string, string, error) {
block := be.bc.CurrentBlock()
statedb, err := state.New(block.Root(), be.chainDb)
if err != nil {
return "", "", err
}
var from *state.StateObject
if len(fromStr) == 0 {
accounts, err := be.am.Accounts()
if err != nil || len(accounts) == 0 {
from = statedb.GetOrNewStateObject(common.Address{})
} else {
from = statedb.GetOrNewStateObject(accounts[0].Address)
}
} else {
from = statedb.GetOrNewStateObject(common.HexToAddress(fromStr))
}
from.SetBalance(common.MaxBig)
msg := callmsg{
from: from,
gas: common.Big(gasStr),
gasPrice: common.Big(gasPriceStr),
value: common.Big(valueStr),
data: common.FromHex(dataStr),
}
if len(toStr) > 0 {
addr := common.HexToAddress(toStr)
msg.to = &addr
}
if msg.gas.Cmp(big.NewInt(0)) == 0 {
msg.gas = big.NewInt(50000000)
}
if msg.gasPrice.Cmp(big.NewInt(0)) == 0 {
msg.gasPrice = new(big.Int).Mul(big.NewInt(50), common.Shannon)
}
header := be.bc.CurrentBlock().Header()
vmenv := core.NewEnv(statedb, be.bc, msg, header)
gp := new(core.GasPool).AddGas(common.MaxBig)
res, gas, err := core.ApplyMessage(vmenv, msg, gp)
return common.ToHex(res), gas.String(), err
}
// Transact forms a transaction from the given arguments and submits it to the
// transactio pool for execution.
func (be *registryAPIBackend) Transact(fromStr, toStr, nonceStr, valueStr, gasStr, gasPriceStr, codeStr string) (string, error) {
if len(toStr) > 0 && toStr != "0x" && !common.IsHexAddress(toStr) {
return "", errors.New("invalid address")
}
var (
from = common.HexToAddress(fromStr)
to = common.HexToAddress(toStr)
value = common.Big(valueStr)
gas *big.Int
price *big.Int
data []byte
contractCreation bool
)
if len(gasStr) == 0 {
gas = big.NewInt(90000)
} else {
gas = common.Big(gasStr)
}
if len(gasPriceStr) == 0 {
price = big.NewInt(10000000000000)
} else {
price = common.Big(gasPriceStr)
}
data = common.FromHex(codeStr)
if len(toStr) == 0 {
contractCreation = true
}
nonce := be.txPool.State().GetNonce(from)
if len(nonceStr) != 0 {
nonce = common.Big(nonceStr).Uint64()
}
var tx *types.Transaction
if contractCreation {
tx = types.NewContractCreation(nonce, value, gas, price, data)
} else {
tx = types.NewTransaction(nonce, to, value, gas, price, data)
}
acc := accounts.Account{from}
signature, err := be.am.Sign(acc, tx.SigHash().Bytes())
if err != nil {
return "", err
}
signedTx, err := tx.WithSignature(signature)
if err != nil {
return "", err
}
be.txPool.SetLocal(signedTx)
if err := be.txPool.Add(signedTx); err != nil {
return "", nil
}
if contractCreation {
addr := crypto.CreateAddress(from, nonce)
glog.V(logger.Info).Infof("Tx(%s) created: %s\n", signedTx.Hash().Hex(), addr.Hex())
} else {
glog.V(logger.Info).Infof("Tx(%s) to: %s\n", signedTx.Hash().Hex(), tx.To().Hex())
}
return signedTx.Hash().Hex(), nil
}
