nimbus-eth1/nimbus/transaction.nim

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# Nimbus
# Copyright (c) 2018 Status Research & Development GmbH
# Licensed under either of
# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
# * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
# at your option. This file may not be copied, modified, or distributed except according to those terms.
import
constants, errors, eth_common, eth_keys, nimcrypto, rlp
proc intrinsicGas*(t: Transaction): GasInt =
# Compute the baseline gas cost for this transaction. This is the amount
# of gas needed to send this transaction (but that is not actually used
# for computation)
raise newException(ValueError, "not implemented intrinsicGas")
proc validate*(t: Transaction) =
# Hook called during instantiation to ensure that all transaction
# parameters pass validation rules
if t.intrinsicGas() > t.gasLimit:
raise newException(ValidationError, "Insufficient gas")
# self.check_signature_validity()
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func rlpEncode*(transaction: Transaction): auto =
# Encode transaction without signature
type
TransHashObj = object
accountNonce: AccountNonce
gasPrice: GasInt
gasLimit: GasInt
to: EthAddress
value: UInt256
payload: Blob
return rlp.encode(TransHashObj(
accountNonce: transaction.accountNonce,
gasPrice: transaction.gasPrice,
gasLimit: transaction.gasLimit,
to: transaction.to,
value: transaction.value,
payload: transaction.payload
))
func hash*(transaction: Transaction): Hash256 =
# Hash transaction without signature
return keccak256.digest(transaction.rlpEncode.toOpenArray)
proc toSignature*(transaction: Transaction): Signature =
var bytes: array[65, byte]
bytes[0..31] = transaction.R.toByteArrayBE()
bytes[32..63] = transaction.S.toByteArrayBE()
# TODO: V will become a byte or range soon.
bytes[64] = transaction.V
initSignature(bytes)
proc getSender*(transaction: Transaction, output: var EthAddress): bool =
## Find the address the transaction was sent from.
let
txHash = transaction.hash # hash without signature
sig = transaction.toSignature()
var pubKey: PublicKey
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if recoverSignatureKey(sig, txHash.data, pubKey) == EthKeysStatus.Success:
output = pubKey.toCanonicalAddress()
result = true
proc getSender*(transaction: Transaction): EthAddress =
## Raises error on failure to recover public key
if not transaction.getSender(result):
raise newException(ValidationError, "Could not derive sender address from transaction")