41 lines
1.4 KiB
Nim
41 lines
1.4 KiB
Nim
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import
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strformat,
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../logging, ../errors, ../constants
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type
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GasMeter* = ref object
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logger*: Logger
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gasRefunded*: Int256
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startGas*: Int256
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gasRemaining*: Int256
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proc newGasMeter*(startGas: Int256): GasMeter =
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new(result)
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result.startGas = startGas
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result.gasRemaining = result.startGas
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result.gasRefunded = 0.Int256
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proc consumeGas*(gasMeter: var GasMeter; amount: Int256; reason: string) =
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if amount < 0.Int256:
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raise newException(ValidationError, "Gas consumption amount must be positive")
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if amount > gasMeter.gasRemaining:
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raise newException(OutOfGas,
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%"Out of gas: Needed {amount} - Remaining {gasMeter.gasRemaining} - Reason: {reason}")
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gasMeter.gasRemaining -= amount
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gasMeter.logger.trace(
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%"GAS CONSUMPTION: {gasMeter.gasRemaining + amount} - {amount} -> {gasMeter.gasRemaining} ({reason})")
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proc returnGas*(gasMeter: var GasMeter; amount: Int256) =
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if amount < 0.Int256:
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raise newException(ValidationError, "Gas return amount must be positive")
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gasMeter.gasRemaining += amount
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gasMeter.logger.trace(
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%"GAS RETURNED: {gasMeter.gasRemaining - amount} + {amount} -> {gasMeter.gasRemaining}")
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proc refundGas*(gasMeter: var GasMeter; amount: Int256) =
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if amount < 0.Int256:
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raise newException(ValidationError, "Gas refund amount must be positive")
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gasMeter.gasRefunded += amount
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gasMeter.logger.trace(
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%"GAS REFUND: {gasMeter.gasRemaining - amount} + {amount} -> {gasMeter.gasRefunded}")
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