214 lines
7.6 KiB
Nim
214 lines
7.6 KiB
Nim
# Nimbus - Various ways of calling the EVM
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#
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# Copyright (c) 2018-2021 Status Research & Development GmbH
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# Licensed under either of
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# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
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# * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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import
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std/[options, times],
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chronicles,
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eth/[common/eth_types, trie/db],
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stint,
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".."/[vm_types, vm_state, vm_gas_costs, forks, constants],
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".."/[db/db_chain, db/accounts_cache, chain_config],
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./call_common
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type
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RpcCallData* = object
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source* : Option[EthAddress]
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to* : Option[EthAddress]
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gasLimit* : Option[GasInt]
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gasPrice* : Option[GasInt]
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maxFee* : Option[GasInt]
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maxPriorityFee*: Option[GasInt]
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value* : Option[UInt256]
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data* : seq[byte]
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accessList* : AccessList
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proc toCallParams(vmState: BaseVMState, cd: RpcCallData,
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globalGasCap: GasInt, baseFee: Option[UInt256],
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forkOverride = none(Fork)): CallParams =
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# Reject invalid combinations of pre- and post-1559 fee styles
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if cd.gasPrice.isSome and (cd.maxFee.isSome or cd.maxPriorityFee.isSome):
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raise newException(ValueError, "both gasPrice and (maxFeePerGas or maxPriorityFeePerGas) specified")
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# Set default gas & gas price if none were set
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var gasLimit = globalGasCap
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if gasLimit == 0:
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gasLimit = GasInt(high(uint64) div 2)
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if cd.gasLimit.isSome:
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gasLimit = cd.gasLimit.get()
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if globalGasCap != 0 and globalGasCap < gasLimit:
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warn "Caller gas above allowance, capping", requested = gasLimit, cap = globalGasCap
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gasLimit = globalGasCap
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var gasPrice = cd.gasPrice.get(0.GasInt)
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if baseFee.isSome:
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# A basefee is provided, necessitating EIP-1559-type execution
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let maxPriorityFee = cd.maxPriorityFee.get(0.GasInt)
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let maxFee = cd.maxFee.get(0.GasInt)
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# Backfill the legacy gasPrice for EVM execution, unless we're all zeroes
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if maxPriorityFee > 0 or maxFee > 0:
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let baseFee = baseFee.get().truncate(GasInt)
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let priorityFee = min(maxPriorityFee, maxFee - baseFee)
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gasPrice = priorityFee + baseFee
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CallParams(
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vmState: vmState,
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forkOverride: forkOverride,
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sender: cd.source.get(ZERO_ADDRESS),
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to: cd.to.get(ZERO_ADDRESS),
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isCreate: cd.to.isNone,
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gasLimit: gasLimit,
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gasPrice: gasPrice,
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value: cd.value.get(0.u256),
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input: cd.data,
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accessList: cd.accessList
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)
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proc rpcCallEvm*(call: RpcCallData, header: BlockHeader, chainDB: BaseChainDB): CallResult =
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const globalGasCap = 0 # TODO: globalGasCap should configurable by user
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let topHeader = BlockHeader(
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parentHash: header.blockHash,
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timestamp: getTime().utc.toTime,
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gasLimit: 0.GasInt, ## ???
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fee: UInt256.none()) ## ???
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let vmState = BaseVMState.new(topHeader, chainDB)
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let params = toCallParams(vmState, call, globalGasCap, header.fee)
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var dbTx = chainDB.db.beginTransaction()
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defer: dbTx.dispose() # always dispose state changes
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runComputation(params)
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proc rpcEstimateGas*(cd: RpcCallData, header: BlockHeader, chainDB: BaseChainDB, gasCap: GasInt): GasInt =
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# Binary search the gas requirement, as it may be higher than the amount used
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let topHeader = BlockHeader(
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parentHash: header.blockHash,
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timestamp: getTime().utc.toTime,
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gasLimit: 0.GasInt, ## ???
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fee: UInt256.none()) ## ???
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let vmState = BaseVMState.new(topHeader, chainDB)
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let fork = chainDB.config.toFork(header.blockNumber)
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let txGas = gasFees[fork][GasTransaction] # txGas always 21000, use constants?
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var params = toCallParams(vmState, cd, gasCap, header.fee)
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var
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lo : GasInt = txGas - 1
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hi : GasInt = cd.gasLimit.get(0.GasInt)
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cap: GasInt
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var dbTx = chainDB.db.beginTransaction()
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defer: dbTx.dispose() # always dispose state changes
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# Determine the highest gas limit can be used during the estimation.
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if hi < txGas:
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# block's gasLimit act as the gas ceiling
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hi = header.gasLimit
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# Normalize the max fee per gas the call is willing to spend.
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var feeCap = cd.gasPrice.get(0.GasInt)
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if cd.gasPrice.isSome and (cd.maxFee.isSome or cd.maxPriorityFee.isSome):
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raise newException(ValueError, "both gasPrice and (maxFeePerGas or maxPriorityFeePerGas) specified")
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elif cd.maxFee.isSome:
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feeCap = cd.maxFee.get
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# Recap the highest gas limit with account's available balance.
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if feeCap > 0:
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if cd.source.isNone:
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raise newException(ValueError, "`from` can't be null")
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let balance = vmState.readOnlyStateDB.getBalance(cd.source.get)
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var available = balance
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if cd.value.isSome:
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let value = cd.value.get
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if value > available:
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raise newException(ValueError, "insufficient funds for transfer")
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available -= value
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let allowance = available div feeCap.u256
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# If the allowance is larger than maximum GasInt, skip checking
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if allowance < high(GasInt).u256 and hi > allowance.truncate(GasInt):
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let transfer = cd.value.get(0.u256)
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warn "Gas estimation capped by limited funds", original=hi, balance,
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sent=transfer, maxFeePerGas=feeCap, fundable=allowance
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hi = allowance.truncate(GasInt)
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# Recap the highest gas allowance with specified gasCap.
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if gasCap != 0 and hi > gasCap:
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warn "Caller gas above allowance, capping", requested=hi, cap=gasCap
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hi = gasCap
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cap = hi
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let intrinsicGas = intrinsicGas(params, fork)
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# Create a helper to check if a gas allowance results in an executable transaction
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proc executable(gasLimit: GasInt): bool =
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if intrinsicGas > gasLimit:
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# Special case, raise gas limit
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return true
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params.gasLimit = gasLimit
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# TODO: bail out on consensus error similar to validateTransaction
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runComputation(params).isError
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# Execute the binary search and hone in on an executable gas limit
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while lo+1 < hi:
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let mid = (hi + lo) div 2
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let failed = executable(mid)
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if failed:
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lo = mid
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else:
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hi = mid
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# Reject the transaction as invalid if it still fails at the highest allowance
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if hi == cap:
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let failed = executable(hi)
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if failed:
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# TODO: provide more descriptive EVM error beside out of gas
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# e.g. revert and other EVM errors
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raise newException(ValueError, "gas required exceeds allowance " & $cap)
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hi
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proc txCallEvm*(tx: Transaction, sender: EthAddress, vmState: BaseVMState, fork: Fork): GasInt =
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var call = CallParams(
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vmState: vmState,
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forkOverride: some(fork),
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gasPrice: tx.gasPrice,
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gasLimit: tx.gasLimit,
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sender: sender,
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to: tx.destination,
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isCreate: tx.contractCreation,
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value: tx.value,
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input: tx.payload
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)
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if tx.txType > TxLegacy:
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shallowCopy(call.accessList, tx.accessList)
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return runComputation(call).gasUsed
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proc testCallEvm*(tx: Transaction, sender: EthAddress, vmState: BaseVMState, fork: Fork): CallResult =
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var call = CallParams(
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vmState: vmState,
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forkOverride: some(fork),
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gasPrice: tx.gasPrice,
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gasLimit: tx.gasLimit,
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sender: sender,
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to: tx.destination,
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isCreate: tx.contractCreation,
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value: tx.value,
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input: tx.payload,
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noIntrinsic: true, # Don't charge intrinsic gas.
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noRefund: true, # Don't apply gas refund/burn rule.
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)
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if tx.txType > TxLegacy:
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shallowCopy(call.accessList, tx.accessList)
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runComputation(call)
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