// ContractCall implements ContractCaller.ContractCall, executing the specified
// contract with the given input data.
func (b *SimulatedBackend) ContractCall(contract common.Address, data []byte, pending bool) ([]byte, error) {
// Create a copy of the current state db to screw around with
var (
block *types.Block
statedb *state.StateDB
)
if pending {
block, statedb = b.pendingBlock, b.pendingState
defer statedb.RevertToSnapshot(statedb.Snapshot())
} else {
block = b.blockchain.CurrentBlock()
statedb, _ = b.blockchain.State()
}
// If there's no code to interact with, respond with an appropriate error
if code := statedb.GetCode(contract); len(code) == 0 {
return nil, bind.ErrNoCode
}
// Set infinite balance to the a fake caller account
from := statedb.GetOrNewStateObject(common.Address{})
from.SetBalance(common.MaxBig)
// Assemble the call invocation to measure the gas usage
msg := callmsg{
from: from,
to: &contract,
gasPrice: new(big.Int),
gasLimit: common.MaxBig,
value: new(big.Int),
data: data,
}
// Execute the call and return
vmenv := core.NewEnv(statedb, chainConfig, b.blockchain, msg, block.Header(), vm.Config{})
gaspool := new(core.GasPool).AddGas(common.MaxBig)
out, _, err := core.ApplyMessage(vmenv, msg, gaspool)
return out, err
}
func (t *BlockTest) ValidatePostState(statedb *state.StateDB) error {
// validate post state accounts in test file against what we have in state db
for addrString, acct := range t.postAccounts {
// XXX: is is worth it checking for errors here?
addr, err := hex.DecodeString(addrString)
if err != nil {
return err
}
code, err := hex.DecodeString(strings.TrimPrefix(acct.Code, "0x"))
if err != nil {
return err
}
balance, ok := new(big.Int).SetString(acct.Balance, 0)
if !ok {
return err
}
nonce, err := strconv.ParseUint(prepInt(16, acct.Nonce), 16, 64)
if err != nil {
return err
}
// address is indirectly verified by the other fields, as it's the db key
code2 := statedb.GetCode(common.BytesToAddress(addr))
balance2 := statedb.GetBalance(common.BytesToAddress(addr))
nonce2 := statedb.GetNonce(common.BytesToAddress(addr))
if !bytes.Equal(code2, code) {
return fmt.Errorf("account code mismatch for addr: %s want: %s have: %s", addrString, hex.EncodeToString(code), hex.EncodeToString(code2))
}
if balance2.Cmp(balance) != 0 {
return fmt.Errorf("account balance mismatch for addr: %s, want: %d, have: %d", addrString, balance, balance2)
}
if nonce2 != nonce {
return fmt.Errorf("account nonce mismatch for addr: %s want: %d have: %d", addrString, nonce, nonce2)
}
}
return nil
}