Exemple #1
0
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
}
Exemple #2
0
// 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
}