da: try using blobdata for eth fallback

op-batcher/batcher/driver.go

@@ -584,7 +584,7 @@ func (l *BatchSubmitter) cancelBlockingTx(queue *txmgr.Queue[txRef], receiptsCh
 	var candidate *txmgr.TxCandidate
 	var err error
 	if isBlockedBlob {
-		candidate, _ = l.calldataTxCandidate([]byte{})
+		candidate = l.calldataTxCandidate([]byte{})
 	} else if candidate, err = l.blobTxCandidate(emptyTxData); err != nil {
 		panic(err) // this error should not happen
 	}
@@ -630,6 +630,20 @@ func (l *BatchSubmitter) publishToAltDAAndL1(txdata txData, queue *txmgr.Queue[t
 	}
 }
 
+// fallbackTxCandidate creates a fallback tx candidate for the given txdata.
+func (l *BatchSubmitter) fallbackTxCandidate(txdata txData) (*txmgr.TxCandidate, error) {
+	switch l.DAClient.FallbackMode {
+	case celestia.FallbackModeBlobData:
+		return l.blobTxCandidate(txdata)
+	case celestia.FallbackModeCallData:
+		return l.calldataTxCandidate(txdata.CallData()), nil
+	case celestia.FallbackModeDisabled:
+		return nil, fmt.Errorf("celestia: fallback disabled")
+	default:
+		return nil, fmt.Errorf("celestia: unknown fallback mode: %s", l.DAClient.FallbackMode)
+	}
+}
+
 // sendTransaction creates & queues for sending a transaction to the batch inbox address with the given `txData`.
 // This call will block if the txmgr queue is at the  max-pending limit.
 // The method will block if the queue's MaxPendingTransactions is exceeded.
@@ -659,7 +673,13 @@ func (l *BatchSubmitter) sendTransaction(txdata txData, queue *txmgr.Queue[txRef
 		}
 		candidate, err = l.celestiaTxCandidate(txdata.CallData())
 		if err != nil {
-			return err
+			l.Log.Error("celestia: blob submission failed", "err", err)
+			candidate, err = l.fallbackTxCandidate(txdata)
+			if err != nil {
+				l.Log.Error("celestia: fallback failed", "err", err)
+				l.recordFailedTx(txdata.ID(), err)
+				return nil
+			}
 		}
 	}
 
@@ -706,24 +726,19 @@ func (l *BatchSubmitter) calldataTxCandidate(data []byte) *txmgr.TxCandidate {
 }
 
 func (l *BatchSubmitter) celestiaTxCandidate(data []byte) (*txmgr.TxCandidate, error) {
-	l.Log.Info("Building Calldata transaction candidate", "size", len(data))
+	l.Log.Info("Building Celestia transaction candidate", "size", len(data))
 	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Duration(l.RollupConfig.BlockTime)*time.Second)
 	ids, err := l.DAClient.Client.Submit(ctx, [][]byte{data}, -1, l.DAClient.Namespace)
 	cancel()
-	if err == nil && len(ids) == 1 {
-		l.Log.Info("celestia: blob successfully submitted", "id", hex.EncodeToString(ids[0]))
-		data = append([]byte{celestia.DerivationVersionCelestia}, ids[0]...)
-	} else {
-		if l.DAClient.EthFallbackDisabled {
-			return nil, fmt.Errorf("celestia: blob submission failed; eth fallback disabled: %w", err)
-		}
-
-		l.Log.Info("celestia: blob submission failed; falling back to eth", "err", err)
+	if err != nil {
+		return nil, err
 	}
-	return &txmgr.TxCandidate{
-		To:     &l.RollupConfig.BatchInboxAddress,
-		TxData: data,
-	}, nil
+	if len(ids) != 1 {
+		return nil, fmt.Errorf("celestia: expected 1 id, got %d", len(ids))
+	}
+	l.Log.Info("celestia: blob successfully submitted", "id", hex.EncodeToString(ids[0]))
+	data = append([]byte{celestia.DerivationVersionCelestia}, ids[0]...)
+	return l.calldataTxCandidate(data), nil
 }
 
 func (l *BatchSubmitter) handleReceipt(r txmgr.TxReceipt[txRef]) {

op-batcher/batcher/service.go

@@ -383,7 +383,7 @@ func (bs *BatcherService) initAltDA(cfg *CLIConfig) error {
 }
 
 func (bs *BatcherService) initDA(cfg *CLIConfig) error {
-	client, err := celestia.NewDAClient(cfg.DaConfig.Rpc, cfg.DaConfig.AuthToken, cfg.DaConfig.Namespace, cfg.DaConfig.EthFallbackDisabled)
+	client, err := celestia.NewDAClient(cfg.DaConfig.Rpc, cfg.DaConfig.AuthToken, cfg.DaConfig.Namespace, cfg.DaConfig.FallbackMode)
 	if err != nil {
 		return err
 	}

op-batcher/batcher/test_batch_submitter.go

@@ -29,7 +29,7 @@ func (l *TestBatchSubmitter) JamTxPool(ctx context.Context) error {
 	var err error
 	cc := l.state.cfgProvider.ChannelConfig()
 	if cc.UseBlobs {
-		candidate, _ = l.calldataTxCandidate([]byte{})
+		candidate = l.calldataTxCandidate([]byte{})
 	} else if candidate, err = l.blobTxCandidate(emptyTxData); err != nil {
 		return err
 	}

op-celestia/cli.go

@@ -1,11 +1,22 @@
 package celestia
 
 import (
+	"fmt"
+
 	"github.com/urfave/cli/v2"
 
 	opservice "github.com/ethereum-optimism/optimism/op-service"
 )
 
+const (
+	// FallbackModeDisabled is the fallback mode disabled
+	FallbackModeDisabled = "disabled"
+	// FallbackModeBlobData is the fallback mode blob data
+	FallbackModeBlobData = "blobdata"
+	// FallbackModeCallData is the fallback mode call data
+	FallbackModeCallData = "calldata"
+)
+
 const (
 	// RPCFlagName defines the flag for the rpc url
 	RPCFlagName = "da.rpc"
@@ -15,6 +26,8 @@ const (
 	NamespaceFlagName = "da.namespace"
 	// EthFallbackDisabledFlagName defines the flag for disabling eth fallback
 	EthFallbackDisabledFlagName = "da.eth_fallback_disabled"
+	// FallbackModeFlagName defines the flag for fallback mode
+	FallbackModeFlagName = "da.fallback_mode"
 
 	// NamespaceSize is the size of the hex encoded namespace string
 	NamespaceSize = 58
@@ -43,17 +56,35 @@ func CLIFlags(envPrefix string) []cli.Flag {
 		},
 		&cli.BoolFlag{
 			Name:    EthFallbackDisabledFlagName,
-			Usage:   "disable eth fallback",
+			Usage:   "disable eth fallback (deprecated, use FallbackModeFlag instead)",
 			EnvVars: opservice.PrefixEnvVar(envPrefix, "DA_ETH_FALLBACK_DISABLED"),
+			Action: func(c *cli.Context, e bool) error {
+				if e {
+					return c.Set(FallbackModeFlagName, FallbackModeDisabled)
+				}
+				return nil
+			},
+		},
+		&cli.StringFlag{
+			Name:    FallbackModeFlagName,
+			Usage:   fmt.Sprintf("fallback mode; must be one of: %s, %s or %s", FallbackModeDisabled, FallbackModeBlobData, FallbackModeCallData),
+			EnvVars: opservice.PrefixEnvVar(envPrefix, "DA_FALLBACK_MODE"),
+			Value:   FallbackModeCallData,
+			Action: func(c *cli.Context, s string) error {
+				if s != FallbackModeDisabled && s != FallbackModeBlobData && s != FallbackModeCallData {
+					return fmt.Errorf("invalid fallback mode: %s; must be one of: %s, %s or %s", s, FallbackModeDisabled, FallbackModeBlobData, FallbackModeCallData)
+				}
+				return nil
+			},
 		},
 	}
 }
 
 type CLIConfig struct {
-	Rpc                 string
-	AuthToken           string
-	Namespace           string
-	EthFallbackDisabled bool
+	Rpc          string
+	AuthToken    string
+	Namespace    string
+	FallbackMode string
 }
 
 func (c CLIConfig) Check() error {
@@ -68,9 +99,9 @@ func NewCLIConfig() CLIConfig {
 
 func ReadCLIConfig(ctx *cli.Context) CLIConfig {
 	return CLIConfig{
-		Rpc:                 ctx.String(RPCFlagName),
-		AuthToken:           ctx.String(AuthTokenFlagName),
-		Namespace:           ctx.String(NamespaceFlagName),
-		EthFallbackDisabled: ctx.Bool(EthFallbackDisabledFlagName),
+		Rpc:          ctx.String(RPCFlagName),
+		AuthToken:    ctx.String(AuthTokenFlagName),
+		Namespace:    ctx.String(NamespaceFlagName),
+		FallbackMode: ctx.String(FallbackModeFlagName),
 	}
 }

op-celestia/da_client.go

@@ -2,20 +2,21 @@ package celestia
 
 import (
 	"encoding/hex"
+	"fmt"
 	"time"
 
 	"github.com/rollkit/go-da"
 	"github.com/rollkit/go-da/proxy"
 )
 
 type DAClient struct {
-	Client              da.DA
-	GetTimeout          time.Duration
-	Namespace           da.Namespace
-	EthFallbackDisabled bool
+	Client       da.DA
+	GetTimeout   time.Duration
+	Namespace    da.Namespace
+	FallbackMode string
 }
 
-func NewDAClient(rpc, token, namespace string, ethFallbackDisabled bool) (*DAClient, error) {
+func NewDAClient(rpc, token, namespace, fallbackMode string) (*DAClient, error) {
 	client, err := proxy.NewClient(rpc, token)
 	if err != nil {
 		return nil, err
@@ -24,10 +25,13 @@ func NewDAClient(rpc, token, namespace string, ethFallbackDisabled bool) (*DACli
 	if err != nil {
 		return nil, err
 	}
+	if fallbackMode != "disabled" && fallbackMode != "blobdata" && fallbackMode != "calldata" {
+		return nil, fmt.Errorf("celestia: unknown fallback mode: %s", fallbackMode)
+	}
 	return &DAClient{
-		Client:              client,
-		GetTimeout:          time.Minute,
-		Namespace:           ns,
-		EthFallbackDisabled: ethFallbackDisabled,
+		Client:       client,
+		GetTimeout:   time.Minute,
+		Namespace:    ns,
+		FallbackMode: fallbackMode,
 	}, nil
 }

op-node/rollup/driver/da.go

@@ -6,7 +6,18 @@ import (
 )
 
 func SetDAClient(cfg celestia.CLIConfig) error {
-	client, err := celestia.NewDAClient(cfg.Rpc, cfg.AuthToken, cfg.Namespace, false)
+	// NOTE: we always read using blob_data_source.go
+	// If the transaction has calldata, based on the prefix byte.
+	//     - If the prefix byte is 0xce
+	//         - We interpret the calldata as a celestia reference and fetch
+	//           the data from celestia.
+	//     - Otherwise, we use the calldata fallback mode.
+	// If the transaction has blobs, we use blobdata fallback mode.
+	// See dataAndHashesFromTxs and DataFromEVMTransactions
+	// The read path always operates in the most permissive mode and is
+	// independent of the fallback mode.
+	// Therefore the configuration value for FallbackMode passed here does not matter.
+	client, err := celestia.NewDAClient(cfg.Rpc, cfg.AuthToken, cfg.Namespace, cfg.FallbackMode)
 	if err != nil {
 		return err
 	}