fix(prover): Reorder guardian prover sign + add allowance flag/logic

cmd/flags/prover.go

@@ -175,6 +175,11 @@ var (
 		Value:    16,
 		Category: proverCategory,
 	}
+	Allowance = &cli.StringFlag{
+		Name:     "prover.allowance",
+		Usage:    "Amount to approve TaikoL1 contract for TaikoToken usage",
+		Category: proverCategory,
+	}
 )
 
 // All prover flags.
@@ -210,4 +215,5 @@ var ProverFlags = MergeFlags(CommonFlags, []cli.Flag{
 	DatabasePath,
 	DatabaseCacheSize,
 	ProverAssignmentHookAddress,
+	Allowance,
 })

prover/config.go

@@ -52,6 +52,7 @@ type Config struct {
 	MaxBlockSlippage                  uint64
 	DatabasePath                      string
 	DatabaseCacheSize                 uint64
+	Allowance                         *big.Int
 }
 
 // NewConfigFromCliContext creates a new config instance from command line flags.
@@ -105,6 +106,16 @@ func NewConfigFromCliContext(c *cli.Context) (*Config, error) {
 		proveBlockMaxTxGasTipCap = new(big.Int).SetUint64(c.Uint64(flags.ProveBlockMaxTxGasTipCap.Name))
 	}
 
+	var allowance *big.Int = common.Big0
+	if c.IsSet(flags.Allowance.Name) {
+		amt, ok := new(big.Int).SetString(c.String(flags.Allowance.Name), 10)
+		if !ok {
+			return nil, fmt.Errorf("error setting allowance config value: %v", c.String(flags.Allowance.Name))
+		}
+
+		allowance = amt
+	}
+
 	return &Config{
 		L1WsEndpoint:                      c.String(flags.L1WSEndpoint.Name),
 		L1HttpEndpoint:                    c.String(flags.L1HTTPEndpoint.Name),
@@ -144,5 +155,6 @@ func NewConfigFromCliContext(c *cli.Context) (*Config, error) {
 		MaxProposedIn:                     c.Uint64(flags.MaxProposedIn.Name),
 		DatabasePath:                      c.String(flags.DatabasePath.Name),
 		DatabaseCacheSize:                 c.Uint64(flags.DatabaseCacheSize.Name),
+		Allowance:                         allowance,
 	}, nil
 }

prover/config_test.go

@@ -18,6 +18,7 @@ var (
 	l2HttpEndpoint = os.Getenv("L2_EXECUTION_ENGINE_HTTP_ENDPOINT")
 	taikoL1        = os.Getenv("TAIKO_L1_ADDRESS")
 	taikoL2        = os.Getenv("TAIKO_L2_ADDRESS")
+	allowance      = "10000000000000000000000000000000000000000000000000"
 	rpcTimeout     = 5 * time.Second
 	minTierFee     = 1024
 )
@@ -57,6 +58,7 @@ func (s *ProverTestSuite) TestNewConfigFromCliContextGuardianProver() {
 		s.Equal(uint64(128), c.DatabaseCacheSize)
 		s.Equal(uint64(100), c.MaxProposedIn)
 		s.Equal(os.Getenv("ASSIGNMENT_HOOK_ADDRESS"), c.AssignmentHookAddress.String())
+		s.Equal(allowance, c.Allowance.String())
 
 		return err
 	}
@@ -88,6 +90,7 @@ func (s *ProverTestSuite) TestNewConfigFromCliContextGuardianProver() {
 		"--" + flags.DatabasePath.Name, "dbPath",
 		"--" + flags.DatabaseCacheSize.Name, "128",
 		"--" + flags.MaxProposedIn.Name, "100",
+		"--" + flags.Allowance.Name, allowance,
 	}))
 }
 
@@ -161,6 +164,7 @@ func (s *ProverTestSuite) SetupApp() *cli.App {
 		&cli.Uint64Flag{Name: flags.DatabaseCacheSize.Name},
 		&cli.Uint64Flag{Name: flags.MaxProposedIn.Name},
 		&cli.StringFlag{Name: flags.ProverAssignmentHookAddress.Name},
+		&cli.StringFlag{Name: flags.Allowance.Name},
 	}
 	app.Action = func(ctx *cli.Context) error {
 		_, err := NewConfigFromCliContext(ctx)

prover/prover.go

@@ -257,17 +257,98 @@ func InitFromConfig(ctx context.Context, p *Prover, cfg *Config) (err error) {
 	if p.IsGuardianProver() {
 		proverServerOpts.ProverPrivateKey = p.cfg.GuardianProverPrivateKey
 	}
+
 	if p.srv, err = server.New(proverServerOpts); err != nil {
 		return err
 	}
 
 	return nil
 }
 
+// setApprovalAmount will set the allowance on the TaikoToken contract for the
+// configured proverAddress as owner and the TaikoL1 contract as spender,
+// if flag is provided for allowance.
+func (p *Prover) setApprovalAmount() error {
+	if p.cfg.Allowance == nil || p.cfg.Allowance.Cmp(common.Big0) != 1 {
+		log.Info("skipping setting approval, allowance not set")
+		return nil
+	}
+
+	allowance, err := p.rpc.TaikoToken.Allowance(
+		&bind.CallOpts{},
+		p.proverAddress,
+		p.cfg.TaikoL1Address,
+	)
+	if err != nil {
+		return err
+	}
+
+	log.Info("existing allowance for taikoL1 contract", "allowance", allowance.String())
+
+	if allowance.Cmp(p.cfg.Allowance) == 1 {
+		log.Info("skipping setting allowance, allowance already greater or equal",
+			"allowance", allowance.String(),
+			"approvalAmount", p.cfg.Allowance.String(),
+		)
+		return nil
+	}
+
+	opts, err := bind.NewKeyedTransactorWithChainID(
+		p.cfg.L1ProverPrivKey,
+		p.rpc.L1ChainID,
+	)
+	if err != nil {
+		return err
+	}
+
+	amt := new(big.Int).Exp(big.NewInt(1_000_000_000), big.NewInt(18), nil)
+
+	log.Info("prover approving taikoL1 for taiko token", "amt", amt.String())
+
+	tx, err := p.rpc.TaikoToken.Approve(
+		opts,
+		p.cfg.TaikoL1Address,
+		amt,
+	)
+	if err != nil {
+		return err
+	}
+
+	receipt, err := rpc.WaitReceipt(context.Background(), p.rpc.L1, tx)
+	if err != nil {
+		return err
+	}
+
+	if receipt.Status != 1 {
+		return errors.New("unsuccessful transaction to approve taikol1")
+	}
+
+	log.Info("prover approved taikoL1 for taiko token", "txHash", receipt.TxHash.Hex())
+
+	allowance, err = p.rpc.TaikoToken.Allowance(
+		&bind.CallOpts{},
+		p.proverAddress,
+		p.cfg.TaikoL1Address,
+	)
+	if err != nil {
+		return err
+	}
+
+	log.Info("new allowance for taikoL1 contract", "allowance", allowance.String())
+
+	return nil
+}
+
 // Start starts the main loop of the L2 block prover.
 func (p *Prover) Start() error {
+	if err := p.setApprovalAmount(); err != nil {
+		log.Crit("failed to set approval amount", "error", err)
+		return err
+	}
+
 	p.wg.Add(1)
 	p.initSubscription()
+
 	go func() {
 		if err := p.srv.Start(fmt.Sprintf(":%v", p.cfg.HTTPServerPort)); !errors.Is(err, http.ErrServerClosed) {
 			log.Crit("Failed to start http server", "error", err)
@@ -391,14 +472,6 @@ func (p *Prover) onBlockProposed(
 		return nil
 	}
 
-	// guardian prover must sign each new block and store in database, to be exposed
-	// via API for liveness checks.
-	if p.IsGuardianProver() {
-		if err := p.signBlock(ctx, event.BlockId); err != nil {
-			return fmt.Errorf("failed to sign block data (eventID %d): %w", event.BlockId, err)
-		}
-	}
-
 	if _, err := p.rpc.WaitL1Origin(ctx, event.BlockId); err != nil {
 		return fmt.Errorf("failed to wait L1Origin (eventID %d): %w", event.BlockId, err)
 	}
@@ -479,6 +552,14 @@ func (p *Prover) onBlockProposed(
 	)
 	metrics.ProverReceivedProposedBlockGauge.Update(event.BlockId.Int64())
 
+	// guardian prover must sign each new block and store in database, to be exposed
+	// via API for liveness checks.
+	if p.IsGuardianProver() {
+		if err := p.signBlock(ctx, event.BlockId); err != nil {
+			return fmt.Errorf("failed to sign block data (eventID %d): %w", event.BlockId, err)
+		}
+	}
+
 	handleBlockProposedEvent := func() error {
 		defer func() { <-p.proposeConcurrencyGuard }()
 
@@ -1185,6 +1266,8 @@ func (p *Prover) signBlock(ctx context.Context, blockID *big.Int) error {
 		return nil
 	}
 
+	log.Info("guardian prover signing block", "blockID", blockID.Uint64())
+
 	block, err := p.rpc.L2.BlockByNumber(ctx, blockID)
 	if err != nil {
 		return err
@@ -1199,5 +1282,7 @@ func (p *Prover) signBlock(ctx context.Context, blockID *big.Int) error {
 		return err
 	}
 
+	log.Info("guardian prover successfully signed block", "blockID", blockID.Uint64())
+
 	return nil
 }

prover/prover_test.go

@@ -9,6 +9,7 @@ import (
 	"testing"
 	"time"
 
+	"github.com/ethereum/go-ethereum/accounts/abi/bind"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/crypto"
@@ -18,6 +19,7 @@ import (
 	"github.com/taikoxyz/taiko-client/bindings/encoding"
 	"github.com/taikoxyz/taiko-client/driver"
 	"github.com/taikoxyz/taiko-client/pkg/jwt"
+	"github.com/taikoxyz/taiko-client/pkg/rpc"
 	"github.com/taikoxyz/taiko-client/proposer"
 	producer "github.com/taikoxyz/taiko-client/prover/proof_producer"
 	"github.com/taikoxyz/taiko-client/testutils"
@@ -42,6 +44,8 @@ func (s *ProverTestSuite) SetupTest() {
 	port, err := strconv.Atoi(proverServerUrl.Port())
 	s.Nil(err)
 
+	allowance := new(big.Int).Exp(big.NewInt(1_000_000_100), big.NewInt(18), nil)
+
 	ctx, cancel := context.WithCancel(context.Background())
 	p := new(Prover)
 	s.Nil(InitFromConfig(ctx, p, (&Config{
@@ -51,6 +55,7 @@ func (s *ProverTestSuite) SetupTest() {
 		L2HttpEndpoint:           os.Getenv("L2_EXECUTION_ENGINE_HTTP_ENDPOINT"),
 		TaikoL1Address:           common.HexToAddress(os.Getenv("TAIKO_L1_ADDRESS")),
 		TaikoL2Address:           common.HexToAddress(os.Getenv("TAIKO_L2_ADDRESS")),
+		TaikoTokenAddress:        common.HexToAddress(os.Getenv("TAIKO_TOKEN_ADDRESS")),
 		GuardianProverAddress:    common.HexToAddress(os.Getenv("GUARDIAN_PROVER_CONTRACT_ADDRESS")),
 		L1ProverPrivKey:          l1ProverPrivKey,
 		GuardianProverPrivateKey: l1ProverPrivKey,
@@ -64,6 +69,7 @@ func (s *ProverTestSuite) SetupTest() {
 		HTTPServerPort:           uint64(port),
 		WaitReceiptTimeout:       12 * time.Second,
 		DatabasePath:             "",
+		Allowance:                allowance,
 	})))
 	p.srv = testutils.NewTestProverServer(
 		&s.ClientTestSuite,
@@ -141,6 +147,7 @@ func (s *ProverTestSuite) TestInitError() {
 		L2HttpEndpoint:                    os.Getenv("L2_EXECUTION_ENGINE_HTTP_ENDPOINT"),
 		TaikoL1Address:                    common.HexToAddress(os.Getenv("TAIKO_L1_ADDRESS")),
 		TaikoL2Address:                    common.HexToAddress(os.Getenv("TAIKO_L2_ADDRESS")),
+		TaikoTokenAddress:                 common.HexToAddress(os.Getenv("TAIKO_TOKEN_ADDRESS")),
 		L1ProverPrivKey:                   l1ProverPrivKey,
 		GuardianProverPrivateKey:          l1ProverPrivKey,
 		Dummy:                             true,
@@ -381,6 +388,50 @@ func (s *ProverTestSuite) TestStartSubscription() {
 	s.NotPanics(s.p.closeSubscription)
 }
 
+func (s *ProverTestSuite) TestSetApprovalAmount() {
+	opts, err := bind.NewKeyedTransactorWithChainID(s.p.proverPrivateKey, s.p.rpc.L1ChainID)
+	s.Nil(err)
+
+	tx, err := s.p.rpc.TaikoToken.Approve(opts, s.p.cfg.TaikoL1Address, common.Big0)
+	s.Nil(err)
+
+	_, err = rpc.WaitReceipt(context.Background(), s.p.rpc.L1, tx)
+	s.Nil(err)
+
+	allowance, err := s.p.rpc.TaikoToken.Allowance(&bind.CallOpts{}, s.p.proverAddress, s.p.cfg.TaikoL1Address)
+	s.Nil(err)
+
+	s.Equal(0, allowance.Cmp(common.Big0))
+
+	// max that can be approved
+	amt, ok := new(big.Int).SetString("58764887351446156758749765621197442946723800609510499661540524634076971270144", 10)
+	s.True(ok)
+
+	s.p.cfg.Allowance = amt
+
+	s.Nil(s.p.setApprovalAmount())
+
+	allowance, err = s.p.rpc.TaikoToken.Allowance(&bind.CallOpts{}, s.p.proverAddress, s.p.cfg.TaikoL1Address)
+	s.Nil(err)
+
+	s.Equal(0, amt.Cmp(allowance))
+}
+
+func (s *ProverTestSuite) TestSetApprovalAlreadySetHigher() {
+	originalAllowance, err := s.p.rpc.TaikoToken.Allowance(&bind.CallOpts{}, s.p.proverAddress, s.p.cfg.TaikoL1Address)
+	s.Nil(err)
+
+	amt := big.NewInt(1)
+	s.p.cfg.Allowance = amt
+
+	s.Nil(s.p.setApprovalAmount())
+
+	allowance, err := s.p.rpc.TaikoToken.Allowance(&bind.CallOpts{}, s.p.proverAddress, s.p.cfg.TaikoL1Address)
+	s.Nil(err)
+
+	s.Equal(0, allowance.Cmp(originalAllowance))
+}
+
 func TestProverTestSuite(t *testing.T) {
 	suite.Run(t, new(ProverTestSuite))
 }