ante.go

package app

import (
	"github.com/cosmos/cosmos-sdk/baseapp"
	sdk "github.com/cosmos/cosmos-sdk/types"
	"github.com/cosmos/cosmos-sdk/types/tx/signing"
	"github.com/cosmos/cosmos-sdk/x/auth/ante"
	authsigning "github.com/cosmos/cosmos-sdk/x/auth/signing"
	"github.com/cosmos/cosmos-sdk/x/auth/types"
)

// HandlerOptions are the options required for constructing a default SDK AnteHandler.
type HandlerOptions struct {
	AccountKeeper   ante.AccountKeeper
	BankKeeper      types.BankKeeper
	ParamStore      baseapp.ParamStore
	SignModeHandler authsigning.SignModeHandler
	SigGasConsumer  func(meter sdk.GasMeter, sig signing.SignatureV2, params types.Params) error
}

// NewAnteHandler returns an AnteHandler that checks and increments sequence
// numbers, checks signatures & account numbers, and deducts fees from the first
// signer.
func NewAnteHandler(options HandlerOptions) sdk.AnteHandler {

	var sigGasConsumer = options.SigGasConsumer
	if sigGasConsumer == nil {
		sigGasConsumer = ante.DefaultSigVerificationGasConsumer
	}

	anteDecorators := []sdk.AnteDecorator{
		ante.NewSetUpContextDecorator(), // outermost AnteDecorator. SetUpContext must be called first
		ante.NewRejectExtensionOptionsDecorator(),
		NewFeeParamDecorator(options.ParamStore),
		ante.NewValidateBasicDecorator(),
		ante.TxTimeoutHeightDecorator{},
		ante.NewValidateMemoDecorator(options.AccountKeeper),
		ante.NewConsumeGasForTxSizeDecorator(options.AccountKeeper),
		NewDeductFeeDecorator(options.AccountKeeper, options.BankKeeper, options.ParamStore),
		ante.NewSetPubKeyDecorator(options.AccountKeeper), // SetPubKeyDecorator must be called before all signature verification decorators
		ante.NewValidateSigCountDecorator(options.AccountKeeper),
		ante.NewSigGasConsumeDecorator(options.AccountKeeper, sigGasConsumer),
		ante.NewSigVerificationDecorator(options.AccountKeeper, options.SignModeHandler),
		ante.NewIncrementSequenceDecorator(options.AccountKeeper),
	}

	return sdk.ChainAnteDecorators(anteDecorators...)
}