100 lines
2.6 KiB
Go
100 lines
2.6 KiB
Go
package types
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import (
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fmt "fmt"
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math "math"
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sdk "github.com/cosmos/cosmos-sdk/types"
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)
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// ErrorNegativeGasConsumed defines an error thrown when the amount of gas refunded results in a
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// negative gas consumed amount.
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// Copied from cosmos-sdk
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type ErrorNegativeGasConsumed struct {
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Descriptor string
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}
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// ErrorGasOverflow defines an error thrown when an action results gas consumption
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// unsigned integer overflow.
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type ErrorGasOverflow struct {
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Descriptor string
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}
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type infiniteGasMeterWithLimit struct {
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consumed sdk.Gas
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limit sdk.Gas
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}
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// NewInfiniteGasMeterWithLimit returns a reference to a new infiniteGasMeter.
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func NewInfiniteGasMeterWithLimit(limit sdk.Gas) *infiniteGasMeterWithLimit {
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return &infiniteGasMeterWithLimit{
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consumed: 0,
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limit: limit,
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}
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}
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func (g *infiniteGasMeterWithLimit) GasConsumed() sdk.Gas {
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return g.consumed
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}
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func (g *infiniteGasMeterWithLimit) GasConsumedToLimit() sdk.Gas {
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return g.consumed
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}
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func (g *infiniteGasMeterWithLimit) Limit() sdk.Gas {
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return g.limit
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}
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// GasRemaining returns the gas left in the GasMeter.
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func (g *infiniteGasMeterWithLimit) GasRemaining() sdk.Gas {
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if g.IsPastLimit() {
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return 0
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}
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return g.limit - g.consumed
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}
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// addUint64Overflow performs the addition operation on two uint64 integers and
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// returns a boolean on whether or not the result overflows.
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func addUint64Overflow(a, b uint64) (uint64, bool) {
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if math.MaxUint64-a < b {
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return 0, true
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}
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return a + b, false
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}
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func (g *infiniteGasMeterWithLimit) ConsumeGas(amount sdk.Gas, descriptor string) {
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var overflow bool
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// TODO: Should we set the consumed field after overflow checking?
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g.consumed, overflow = addUint64Overflow(g.consumed, amount)
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if overflow {
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panic(ErrorGasOverflow{descriptor})
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}
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}
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// RefundGas will deduct the given amount from the gas consumed. If the amount is greater than the
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// gas consumed, the function will panic.
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//
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// Use case: This functionality enables refunding gas to the transaction or block gas pools so that
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// EVM-compatible chains can fully support the go-ethereum StateDb interface.
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// See https://github.com/cosmos/cosmos-sdk/pull/9403 for reference.
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func (g *infiniteGasMeterWithLimit) RefundGas(amount sdk.Gas, descriptor string) {
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if g.consumed < amount {
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panic(ErrorNegativeGasConsumed{Descriptor: descriptor})
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}
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g.consumed -= amount
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}
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func (g *infiniteGasMeterWithLimit) IsPastLimit() bool {
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return false
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}
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func (g *infiniteGasMeterWithLimit) IsOutOfGas() bool {
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return false
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}
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func (g *infiniteGasMeterWithLimit) String() string {
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return fmt.Sprintf("InfiniteGasMeter:\n consumed: %d", g.consumed)
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}
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