nimbus-eth1/nimbus/vm/interpreter/gas_meter.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
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chronicles, strformat, eth/common, # GasInt
../../errors, ../types
logScope:
topics = "vm gas"
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proc init*(m: var GasMeter, startGas: GasInt) =
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m.gasRemaining = startGas
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m.gasRefunded = 0
proc consumeGas*(gasMeter: var GasMeter; amount: GasInt; reason: string) =
if amount > gasMeter.gasRemaining:
raise newException(OutOfGas,
&"Out of gas: Needed {amount} - Remaining {gasMeter.gasRemaining} - Reason: {reason}")
gasMeter.gasRemaining -= amount
trace "GAS CONSUMPTION", total = gasMeter.gasRemaining + amount, amount, remaining = gasMeter.gasRemaining, reason
proc returnGas*(gasMeter: var GasMeter; amount: GasInt) =
gasMeter.gasRemaining += amount
trace "GAS RETURNED", consumed = gasMeter.gasRemaining - amount, amount, remaining = gasMeter.gasRemaining
proc refundGas*(gasMeter: var GasMeter; amount: GasInt) =
gasMeter.gasRefunded += amount
trace "GAS REFUND", consumed = gasMeter.gasRemaining - amount, amount, refunded = gasMeter.gasRefunded