210 lines
7.0 KiB
Nim
210 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
|
|
chronicles,
|
|
chronos,
|
|
eth/common/eth_types_rlp,
|
|
stew/assign2,
|
|
../evm/[types, state, internals],
|
|
../db/ledger,
|
|
../transaction,
|
|
../evm/evm_errors,
|
|
../rpc/params,
|
|
./call_common,
|
|
web3/eth_api_types,
|
|
../common/common
|
|
|
|
export
|
|
call_common
|
|
|
|
proc rpcCallEvm*(args: TransactionArgs,
|
|
header: Header,
|
|
com: CommonRef): EvmResult[CallResult] =
|
|
const globalGasCap = 0 # TODO: globalGasCap should configurable by user
|
|
let topHeader = Header(
|
|
parentHash: header.blockHash,
|
|
timestamp: EthTime.now(),
|
|
gasLimit: 0.GasInt, ## ???
|
|
baseFeePerGas: Opt.none UInt256, ## ???
|
|
)
|
|
let vmState = ? BaseVMState.new(topHeader, com)
|
|
let params = ? toCallParams(vmState, args, globalGasCap, header.baseFeePerGas)
|
|
|
|
var dbTx = com.db.ctx.txFrameBegin()
|
|
defer: dbTx.dispose() # always dispose state changes
|
|
|
|
ok(runComputation(params, CallResult))
|
|
|
|
proc rpcCallEvm*(args: TransactionArgs,
|
|
header: Header,
|
|
com: CommonRef,
|
|
vmState: BaseVMState): EvmResult[CallResult] =
|
|
const globalGasCap = 0 # TODO: globalGasCap should configurable by user
|
|
let params = ? toCallParams(vmState, args, globalGasCap, header.baseFeePerGas)
|
|
|
|
var dbTx = com.db.ctx.txFrameBegin()
|
|
defer: dbTx.dispose() # always dispose state changes
|
|
|
|
ok(runComputation(params, CallResult))
|
|
|
|
proc rpcEstimateGas*(args: TransactionArgs,
|
|
header: Header,
|
|
com: CommonRef, gasCap: GasInt): EvmResult[GasInt] =
|
|
# Binary search the gas requirement, as it may be higher than the amount used
|
|
let topHeader = Header(
|
|
parentHash: header.blockHash,
|
|
timestamp: EthTime.now(),
|
|
gasLimit: 0.GasInt, ## ???
|
|
baseFeePerGas: Opt.none UInt256, ## ???
|
|
)
|
|
let vmState = ? BaseVMState.new(topHeader, com)
|
|
let fork = vmState.fork
|
|
let txGas = GasInt gasFees[fork][GasTransaction] # txGas always 21000, use constants?
|
|
var params = ? toCallParams(vmState, args, gasCap, header.baseFeePerGas)
|
|
|
|
var
|
|
lo : GasInt = txGas - 1
|
|
hi : GasInt = GasInt args.gas.get(0.Quantity)
|
|
cap: GasInt
|
|
|
|
var dbTx = com.db.ctx.txFrameBegin()
|
|
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):
|
|
return err(evmErr(EvmInvalidParam))
|
|
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:
|
|
return err(evmErr(EvmInvalidParam))
|
|
|
|
let balance = vmState.readOnlyStateDB.getBalance(args.source.get)
|
|
var available = balance
|
|
if args.value.isSome:
|
|
let value = args.value.get
|
|
if value > available:
|
|
return err(evmErr(EvmInvalidParam))
|
|
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, fork)
|
|
|
|
# Create a helper to check if a gas allowance results in an executable transaction
|
|
proc executable(gasLimit: GasInt): EvmResult[bool] =
|
|
if intrinsicGas > gasLimit:
|
|
# Special case, raise gas limit
|
|
return ok(true)
|
|
|
|
params.gasLimit = gasLimit
|
|
# TODO: bail out on consensus error similar to validateTransaction
|
|
let res = runComputation(params, string)
|
|
ok(res.len > 0)
|
|
|
|
# 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
|
|
return err(evmErr(EvmInvalidParam))
|
|
|
|
ok(hi)
|
|
|
|
proc callParamsForTx(tx: Transaction, sender: Address, vmState: BaseVMState, baseFee: GasInt): 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,
|
|
gasPrice: tx.effectiveGasPrice(baseFee),
|
|
gasLimit: tx.gasLimit,
|
|
sender: sender,
|
|
to: tx.destination,
|
|
isCreate: tx.contractCreation,
|
|
value: tx.value,
|
|
input: tx.payload
|
|
)
|
|
if tx.txType > TxLegacy:
|
|
assign(result.accessList, tx.accessList)
|
|
|
|
if tx.txType == TxEip4844:
|
|
assign(result.versionedHashes, tx.versionedHashes)
|
|
|
|
if tx.txType == TxEip7702:
|
|
assign(result.authorizationList, tx.authorizationList)
|
|
|
|
proc callParamsForTest(tx: Transaction, sender: Address, vmState: BaseVMState): CallParams =
|
|
result = CallParams(
|
|
vmState: vmState,
|
|
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:
|
|
assign(result.accessList, tx.accessList)
|
|
|
|
if tx.txType == TxEip4844:
|
|
assign(result.versionedHashes, tx.versionedHashes)
|
|
|
|
if tx.txType == TxEip7702:
|
|
assign(result.authorizationList, tx.authorizationList)
|
|
|
|
proc txCallEvm*(tx: Transaction,
|
|
sender: Address,
|
|
vmState: BaseVMState, baseFee: GasInt): GasInt =
|
|
let
|
|
call = callParamsForTx(tx, sender, vmState, baseFee)
|
|
runComputation(call, GasInt)
|
|
|
|
proc testCallEvm*(tx: Transaction,
|
|
sender: Address,
|
|
vmState: BaseVMState): DebugCallResult =
|
|
let call = callParamsForTest(tx, sender, vmState)
|
|
runComputation(call, DebugCallResult)
|