77 lines
2.4 KiB
Go
77 lines
2.4 KiB
Go
package ante
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
sdk "github.com/cosmos/cosmos-sdk/types"
|
|
sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
|
|
"github.com/cosmos/cosmos-sdk/x/auth/types"
|
|
)
|
|
|
|
var (
|
|
_ GasTx = (*types.StdTx)(nil) // assert StdTx implements GasTx
|
|
)
|
|
|
|
// GasTx defines a Tx with a GetGas() method which is needed to use SetUpContextDecorator
|
|
type GasTx interface {
|
|
sdk.Tx
|
|
GetGas() uint64
|
|
}
|
|
|
|
// SetUpContextDecorator sets the GasMeter in the Context and wraps the next AnteHandler with a defer clause
|
|
// to recover from any downstream OutOfGas panics in the AnteHandler chain to return an error with information
|
|
// on gas provided and gas used.
|
|
// CONTRACT: Must be first decorator in the chain
|
|
// CONTRACT: Tx must implement GasTx interface
|
|
type SetUpContextDecorator struct{}
|
|
|
|
func NewSetUpContextDecorator() SetUpContextDecorator {
|
|
return SetUpContextDecorator{}
|
|
}
|
|
|
|
func (sud SetUpContextDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error) {
|
|
// all transactions must implement GasTx
|
|
gasTx, ok := tx.(GasTx)
|
|
if !ok {
|
|
// Set a gas meter with limit 0 as to prevent an infinite gas meter attack
|
|
// during runTx.
|
|
newCtx = SetGasMeter(simulate, ctx, 0)
|
|
return newCtx, sdkerrors.Wrap(sdkerrors.ErrTxDecode, "Tx must be GasTx")
|
|
}
|
|
|
|
newCtx = SetGasMeter(simulate, ctx, gasTx.GetGas())
|
|
|
|
// Decorator will catch an OutOfGasPanic caused in the next antehandler
|
|
// AnteHandlers must have their own defer/recover in order for the BaseApp
|
|
// to know how much gas was used! This is because the GasMeter is created in
|
|
// the AnteHandler, but if it panics the context won't be set properly in
|
|
// runTx's recover call.
|
|
defer func() {
|
|
if r := recover(); r != nil {
|
|
switch rType := r.(type) {
|
|
case sdk.ErrorOutOfGas:
|
|
log := fmt.Sprintf(
|
|
"out of gas in location: %v; gasWanted: %d, gasUsed: %d",
|
|
rType.Descriptor, gasTx.GetGas(), newCtx.GasMeter().GasConsumed())
|
|
|
|
err = sdkerrors.Wrap(sdkerrors.ErrOutOfGas, log)
|
|
default:
|
|
panic(r)
|
|
}
|
|
}
|
|
}()
|
|
|
|
return next(newCtx, tx, simulate)
|
|
}
|
|
|
|
// SetGasMeter returns a new context with a gas meter set from a given context.
|
|
func SetGasMeter(simulate bool, ctx sdk.Context, gasLimit uint64) sdk.Context {
|
|
// In various cases such as simulation and during the genesis block, we do not
|
|
// meter any gas utilization.
|
|
if simulate || ctx.BlockHeight() == 0 {
|
|
return ctx.WithGasMeter(sdk.NewInfiniteGasMeter())
|
|
}
|
|
|
|
return ctx.WithGasMeter(sdk.NewGasMeter(gasLimit))
|
|
}
|