func (s *PublicBlockChainAPI) doCall(args CallArgs, blockNr rpc.BlockNumber) (string, *big.Int, error) {
if block := blockByNumber(s.miner, s.bc, blockNr); block != nil {
stateDb, err := state.New(block.Root(), s.chainDb)
if err != nil {
return "0x", nil, err
}
stateDb = stateDb.Copy()
var from *state.StateObject
if args.From == (common.Address{}) {
accounts, err := s.am.Accounts()
if err != nil || len(accounts) == 0 {
from = stateDb.GetOrNewStateObject(common.Address{})
} else {
from = stateDb.GetOrNewStateObject(accounts[0].Address)
}
} else {
from = stateDb.GetOrNewStateObject(args.From)
}
from.SetBalance(common.MaxBig)
msg := callmsg{
from: from,
to: &args.To,
gas: args.Gas.BigInt(),
gasPrice: args.GasPrice.BigInt(),
value: args.Value.BigInt(),
data: common.FromHex(args.Data),
}
if msg.gas.Cmp(common.Big0) == 0 {
msg.gas = big.NewInt(50000000)
}
if msg.gasPrice.Cmp(common.Big0) == 0 {
msg.gasPrice = new(big.Int).Mul(big.NewInt(50), common.Shannon)
}
header := s.bc.CurrentBlock().Header()
vmenv := core.NewEnv(stateDb, s.bc, msg, header)
gp := new(core.GasPool).AddGas(common.MaxBig)
res, gas, err := core.ApplyMessage(vmenv, msg, gp)
if len(res) == 0 { // backwards compatability
return "0x", gas, err
}
return common.ToHex(res), gas, err
}
return "0x", common.Big0, nil
}
// 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
}