chore: better logs in batcher

Author: samlaf

op-batcher/batcher/channel.go

@@ -65,6 +65,7 @@ func (c *channel) TxFailed(id string, failoverToEthDA bool) {
 		// and is only used while the altDA is down, so we can afford to be inefficient here.
 		// TODO: figure out how to switch to blobs/auto instead. Might need to make
 		// batcherService.initChannelConfig function stateless so that we can reuse it.
+		c.log.Info("Failing over to calldata txs", "id", c.ID())
 		c.cfg.DaType = DaTypeCalldata
 	}
 	c.metr.RecordBatchTxFailed()

op-batcher/batcher/channel_manager.go

@@ -318,7 +318,7 @@ func (s *channelManager) ensureChannelWithSpace(l1Head eth.BlockID) error {
 		"compression_algo", cfg.CompressorConfig.CompressionAlgo,
 		"target_num_frames", cfg.TargetNumFrames,
 		"max_frame_size", cfg.MaxFrameSize,
-		"da_type", cfg.DaType,
+		"da_type", cfg.DaType.String(),
 	)
 	s.metr.RecordChannelOpened(pc.ID(), s.pendingBlocks())
 

op-batcher/batcher/tx_data.go

@@ -21,6 +21,19 @@ const (
 	DaTypeAltDA
 )
 
+func (d DaType) String() string {
+	switch d {
+	case DaTypeCalldata:
+		return "calldata"
+	case DaTypeBlob:
+		return "blob"
+	case DaTypeAltDA:
+		return "alt_da"
+	default:
+		return fmt.Sprintf("unknown_da_type_%d", d)
+	}
+}
+
 // txData represents the data for a single transaction.
 //
 // Note: The batcher currently sends exactly one frame per transaction. This