feat(BB): Free Lane (#167)

tests/app/ante.go

@@ -4,6 +4,7 @@ import (
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/cosmos/cosmos-sdk/x/auth/ante"
 	"github.com/skip-mev/pob/blockbuster"
+	"github.com/skip-mev/pob/blockbuster/utils"
 	builderante "github.com/skip-mev/pob/x/builder/ante"
 	builderkeeper "github.com/skip-mev/pob/x/builder/keeper"
 )
@@ -15,6 +16,7 @@ type POBHandlerOptions struct {
 	TxDecoder     sdk.TxDecoder
 	TxEncoder     sdk.TxEncoder
 	BuilderKeeper builderkeeper.Keeper
+	FreeLane      blockbuster.Lane
 }
 
 // NewPOBAnteHandler wraps all of the default Cosmos SDK AnteDecorators with the POB AnteHandler.
@@ -38,11 +40,14 @@ func NewPOBAnteHandler(options POBHandlerOptions) sdk.AnteHandler {
 		ante.NewTxTimeoutHeightDecorator(),
 		ante.NewValidateMemoDecorator(options.BaseOptions.AccountKeeper),
 		ante.NewConsumeGasForTxSizeDecorator(options.BaseOptions.AccountKeeper),
-		ante.NewDeductFeeDecorator(
-			options.BaseOptions.AccountKeeper,
-			options.BaseOptions.BankKeeper,
-			options.BaseOptions.FeegrantKeeper,
-			options.BaseOptions.TxFeeChecker,
+		utils.NewIgnoreDecorator(
+			ante.NewDeductFeeDecorator(
+				options.BaseOptions.AccountKeeper,
+				options.BaseOptions.BankKeeper,
+				options.BaseOptions.FeegrantKeeper,
+				options.BaseOptions.TxFeeChecker,
+			),
+			options.FreeLane,
 		),
 		ante.NewSetPubKeyDecorator(options.BaseOptions.AccountKeeper), // SetPubKeyDecorator must be called before all signature verification decorators
 		ante.NewValidateSigCountDecorator(options.BaseOptions.AccountKeeper),

tests/app/app.go

@@ -71,6 +71,7 @@ import (
 	"github.com/skip-mev/pob/blockbuster/abci"
 	"github.com/skip-mev/pob/blockbuster/lanes/auction"
 	"github.com/skip-mev/pob/blockbuster/lanes/base"
+	"github.com/skip-mev/pob/blockbuster/lanes/free"
 	buildermodule "github.com/skip-mev/pob/x/builder"
 	builderkeeper "github.com/skip-mev/pob/x/builder/keeper"
 )
@@ -287,10 +288,17 @@ func New(
 		auction.NewDefaultAuctionFactory(app.txConfig.TxDecoder()),
 	)
 
+	// Free lane allows transactions to be included in the next block for free.
+	freeLane := free.NewFreeLane(
+		config,
+		free.NewDefaultFreeFactory(app.txConfig.TxDecoder()),
+	)
+
 	// Default lane accepts all other transactions.
 	defaultLane := base.NewDefaultLane(config)
 	lanes := []blockbuster.Lane{
 		tobLane,
+		freeLane,
 		defaultLane,
 	}
 
@@ -311,6 +319,7 @@ func New(
 		BuilderKeeper: app.BuilderKeeper,
 		TxDecoder:     app.txConfig.TxDecoder(),
 		TxEncoder:     app.txConfig.TxEncoder(),
+		FreeLane:      freeLane,
 		TOBLane:       tobLane,
 		Mempool:       mempool,
 	}