nimbus-eth1/nimbus/transaction/call_evm.nim

200 lines
7.0 KiB
Nim

# Nimbus - Various ways of calling the EVM
#
# Copyright (c) 2018-2024 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.
{.push raises: [].}
import
std/[options],
chronicles,
chronos,
eth/common/eth_types_rlp,
".."/[vm_types, vm_state, vm_gas_costs],
../db/ledger,
../common/common,
../rpc/params,
./call_common
export
call_common
proc rpcCallEvm*(args: TransactionArgs, header: common.BlockHeader, com: CommonRef): CallResult
{.gcsafe, raises: [CatchableError].} =
const globalGasCap = 0 # TODO: globalGasCap should configurable by user
let topHeader = common.BlockHeader(
parentHash: header.blockHash,
timestamp: EthTime.now(),
gasLimit: 0.GasInt, ## ???
fee: UInt256.none()) ## ???
let vmState = BaseVMState.new(topHeader, com)
let params = toCallParams(vmState, args, globalGasCap, header.fee)
var dbTx = com.db.beginTransaction()
defer: dbTx.dispose() # always dispose state changes
runComputation(params)
proc rpcCallEvm*(args: TransactionArgs,
header: common.BlockHeader,
com: CommonRef,
vmState: BaseVMState): CallResult
{.gcsafe, raises: [CatchableError].} =
const globalGasCap = 0 # TODO: globalGasCap should configurable by user
let params = toCallParams(vmState, args, globalGasCap, header.fee)
var dbTx = com.db.beginTransaction()
defer: dbTx.dispose() # always dispose state changes
runComputation(params)
proc rpcEstimateGas*(args: TransactionArgs,
header: common.BlockHeader,
com: CommonRef, gasCap: GasInt): GasInt
{.gcsafe, raises: [CatchableError].} =
# Binary search the gas requirement, as it may be higher than the amount used
let topHeader = common.BlockHeader(
parentHash: header.blockHash,
timestamp: EthTime.now(),
gasLimit: 0.GasInt, ## ???
fee: UInt256.none()) ## ???
let vmState = BaseVMState.new(topHeader, com)
let fork = vmState.determineFork
let txGas = gasFees[fork][GasTransaction] # txGas always 21000, use constants?
var params = toCallParams(vmState, args, gasCap, header.fee)
var
lo : GasInt = txGas - 1
hi : GasInt = GasInt args.gas.get(0.Quantity)
cap: GasInt
var dbTx = com.db.beginTransaction()
defer: dbTx.dispose() # always dispose state changes
# Determine the highest gas limit can be used during the estimation.
if hi < txGas:
# block's gasLimit act as the gas ceiling
hi = header.gasLimit
# Normalize the max fee per gas the call is willing to spend.
var feeCap = GasInt args.gasPrice.get(0.Quantity)
if args.gasPrice.isSome and
(args.maxFeePerGas.isSome or args.maxPriorityFeePerGas.isSome):
raise newException(ValueError,
"both gasPrice and (maxFeePerGas or maxPriorityFeePerGas) specified")
elif args.maxFeePerGas.isSome:
feeCap = GasInt args.maxFeePerGas.get
# Recap the highest gas limit with account's available balance.
if feeCap > 0:
if args.source.isNone:
raise newException(ValueError, "`from` can't be null")
let balance = vmState.readOnlyStateDB.getBalance(ethAddr args.source.get)
var available = balance
if args.value.isSome:
let value = args.value.get
if value > available:
raise newException(ValueError, "insufficient funds for transfer")
available -= value
let allowance = available div feeCap.u256
# If the allowance is larger than maximum GasInt, skip checking
if allowance < high(GasInt).u256 and hi > allowance.truncate(GasInt):
let transfer = args.value.get(0.u256)
warn "Gas estimation capped by limited funds", original=hi, balance,
sent=transfer, maxFeePerGas=feeCap, fundable=allowance
hi = allowance.truncate(GasInt)
# Recap the highest gas allowance with specified gasCap.
if gasCap != 0 and hi > gasCap:
warn "Caller gas above allowance, capping", requested=hi, cap=gasCap
hi = gasCap
cap = hi
let intrinsicGas = intrinsicGas(params, vmState)
# Create a helper to check if a gas allowance results in an executable transaction
proc executable(gasLimit: GasInt): bool
{.gcsafe, raises: [CatchableError].} =
if intrinsicGas > gasLimit:
# Special case, raise gas limit
return true
params.gasLimit = gasLimit
# TODO: bail out on consensus error similar to validateTransaction
runComputation(params).isError
# Execute the binary search and hone in on an executable gas limit
while lo+1 < hi:
let mid = (hi + lo) div 2
let failed = executable(mid)
if failed:
lo = mid
else:
hi = mid
# Reject the transaction as invalid if it still fails at the highest allowance
if hi == cap:
let failed = executable(hi)
if failed:
# TODO: provide more descriptive EVM error beside out of gas
# e.g. revert and other EVM errors
raise newException(ValueError, "gas required exceeds allowance " & $cap)
hi
proc callParamsForTx(tx: Transaction, sender: EthAddress, vmState: BaseVMState, fork: EVMFork): CallParams =
# Is there a nice idiom for this kind of thing? Should I
# just be writing this as a bunch of assignment statements?
result = CallParams(
vmState: vmState,
forkOverride: some(fork),
gasPrice: tx.gasPrice,
gasLimit: tx.gasLimit,
sender: sender,
to: tx.destination,
isCreate: tx.contractCreation,
value: tx.value,
input: tx.payload
)
if tx.txType > TxLegacy:
result.accessList = tx.accessList
if tx.txType >= TxEip4844:
result.versionedHashes = tx.versionedHashes
proc callParamsForTest(tx: Transaction, sender: EthAddress, vmState: BaseVMState, fork: EVMFork): CallParams =
result = CallParams(
vmState: vmState,
forkOverride: some(fork),
gasPrice: tx.gasPrice,
gasLimit: tx.gasLimit,
sender: sender,
to: tx.destination,
isCreate: tx.contractCreation,
value: tx.value,
input: tx.payload,
noIntrinsic: true, # Don't charge intrinsic gas.
noRefund: true, # Don't apply gas refund/burn rule.
)
if tx.txType > TxLegacy:
result.accessList = tx.accessList
if tx.txType >= TxEip4844:
result.versionedHashes = tx.versionedHashes
proc txCallEvm*(tx: Transaction, sender: EthAddress, vmState: BaseVMState, fork: EVMFork): GasInt
{.gcsafe, raises: [CatchableError].} =
let call = callParamsForTx(tx, sender, vmState, fork)
return runComputation(call).gasUsed
proc testCallEvm*(tx: Transaction, sender: EthAddress, vmState: BaseVMState, fork: EVMFork): CallResult
{.gcsafe, raises: [CatchableError].} =
let call = callParamsForTest(tx, sender, vmState, fork)
runComputation(call)