nimbus-eth1/nimbus/p2p/executor/process_transaction.nim

141 lines
5.4 KiB
Nim

# 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
std/[sets],
../../db/accounts_cache,
../../forks,
../../transaction/call_evm,
../../transaction,
../../vm_state,
../../vm_types,
../validate,
./executor_helpers,
chronicles,
eth/common,
stew/results
{.push raises: [Defect].}
# ------------------------------------------------------------------------------
# Private functions
# ------------------------------------------------------------------------------
proc eip1559BaseFee(header: BlockHeader; fork: Fork): UInt256 =
## Actually, `baseFee` should be 0 for pre-London headers already. But this
## function just plays safe. In particular, the `test_general_state_json.nim`
## module modifies this block header `baseFee` field unconditionally :(.
if FkLondon <= fork:
result = header.baseFee
proc processTransactionImpl(
vmState: BaseVMState; ## Parent accounts environment for transaction
tx: Transaction; ## Transaction to validate
sender: EthAddress; ## tx.getSender or tx.ecRecover
header: BlockHeader; ## Header for the block containing the current tx
fork: Fork): Result[GasInt,void]
# wildcard exception, wrapped below
{.gcsafe, raises: [Exception].} =
## Modelled after `https://eips.ethereum.org/EIPS/eip-1559#specification`_
## which provides a backward compatible framwork for EIP1559.
#trace "Sender", sender
#trace "txHash", rlpHash = ty.rlpHash
let
roDB = vmState.readOnlyStateDB
baseFee256 = header.eip1559BaseFee(fork)
baseFee = baseFee256.truncate(GasInt)
tx = eip1559TxNormalization(tx, baseFee, fork)
priorityFee = min(tx.maxPriorityFee, tx.maxFee - baseFee)
miner = vmState.coinbase()
# Return failure unless explicitely set `ok()`
result = err()
# Actually, the eip-1559 reference does not mention an early exit.
#
# Even though database was not changed yet but, a `persist()` directive
# before leaving is crucial for some unit tests that us a direct/deep call
# of the `processTransaction()` function. So there is no `return err()`
# statement, here.
if roDB.validateTransaction(tx, sender, header.gasLimit, baseFee256, fork):
# Execute the transaction.
let
accTx = vmState.stateDB.beginSavepoint
gasBurned = tx.txCallEvm(sender, vmState, fork)
# Make sure that the tx does not exceed the maximum cumulative limit as
# set in the block header. Again, the eip-1559 reference does not mention
# an early stop. It would rather detect differing values for the block
# header `gasUsed` and the `vmState.cumulativeGasUsed` at a later stage.
if header.gasLimit < vmState.cumulativeGasUsed + gasBurned:
vmState.stateDB.rollback(accTx)
debug "invalid tx: block header gasLimit reached",
maxLimit = header.gasLimit,
gasUsed = vmState.cumulativeGasUsed,
addition = gasBurned
else:
# Accept transaction and collect mining fee.
vmState.stateDB.commit(accTx)
vmState.stateDB.addBalance(miner, gasBurned.u256 * priorityFee.u256)
vmState.cumulativeGasUsed += gasBurned
result = ok(gasBurned)
vmState.mutateStateDB:
for deletedAccount in vmState.selfDestructs:
db.deleteAccount deletedAccount
if fork >= FkSpurious:
vmState.touchedAccounts.incl(miner)
# EIP158/161 state clearing
for account in vmState.touchedAccounts:
if db.accountExists(account) and db.isEmptyAccount(account):
debug "state clearing", account
db.deleteAccount(account)
if vmState.generateWitness:
vmState.stateDB.collectWitnessData()
vmState.stateDB.persist(clearCache = false)
# ------------------------------------------------------------------------------
# Public functions
# ------------------------------------------------------------------------------
proc processTransaction*(
vmState: BaseVMState; ## Parent accounts environment for transaction
tx: Transaction; ## Transaction to validate
sender: EthAddress; ## tx.getSender or tx.ecRecover
header: BlockHeader; ## Header for the block containing the current tx
fork: Fork): Result[GasInt,void]
{.gcsafe, raises: [Defect,CatchableError].} =
## Process the transaction, write the results to accounts db. The function
## returns the amount of gas burned if executed.
safeExecutor("processTransaction"):
result = vmState.processTransactionImpl(tx, sender, header, fork)
proc processTransaction*(
vmState: BaseVMState; ## Parent accounts environment for transaction
tx: Transaction; ## Transaction to validate
sender: EthAddress; ## tx.getSender or tx.ecRecover
header: BlockHeader): Result[GasInt,void]
{.gcsafe, raises: [Defect,CatchableError].} =
## Variant of `processTransaction()` with `*fork* derived
## from the `vmState` argument.
var fork: Fork
safeExecutor("processTransaction"):
fork = vmState.getForkUnsafe
vmState.processTransaction(tx, sender, header, fork)
# ------------------------------------------------------------------------------
# End
# ------------------------------------------------------------------------------