rm unused

cmd/opera/launcher/chaincmd.go

@@ -116,22 +116,6 @@ EVM export mode is configured with --export.evm.mode.
     opera export evm-keys
 
 Requires a first argument of the DB directory to write to.
-`,
-			},
-			{
-				Name:      "graph",
-				Usage:     "Export events DAG",
-				ArgsUsage: "<filename> [<epochFrom> <epochTo>]",
-				Action:    utils.MigrateFlags(exportDAGgraph),
-				Flags: []cli.Flag{
-					DataDirFlag,
-				},
-				Description: `
-    opera export graph
-
-Requires a first argument of the file to write to.
-Optional second and third arguments control the first and
-last epoch to write
 `,
 			},
 		},

cmd/opera/launcher/export.go

@@ -18,9 +18,11 @@ import (
 	"github.com/ethereum/go-ethereum/rlp"
 	"github.com/status-im/keycard-go/hexutils"
 	"github.com/syndtr/goleveldb/leveldb/opt"
+	"gonum.org/v1/gonum/graph/encoding/dot"
 	"gopkg.in/urfave/cli.v1"
 
 	"github.com/Fantom-foundation/go-opera/gossip"
+	"github.com/Fantom-foundation/go-opera/utils/dag"
 	"github.com/Fantom-foundation/go-opera/utils/dbutil/autocompact"
 )
 
@@ -131,6 +133,22 @@ func exportRLP(w io.Writer, gdb *gossip.Store, from, to idx.Epoch) (err error) {
 	return
 }
 
+// exportDOT writer the active chain.
+func exportDOT(writer io.Writer, gdb *gossip.Store, from, to idx.Epoch) (err error) {
+	graph := dag.Graph(gdb, from, to)
+	buf, err := dot.Marshal(graph, "DAG", "", "\t")
+	if err != nil {
+		return err
+	}
+
+	_, err = writer.Write(buf)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
 func exportEvmKeys(ctx *cli.Context) error {
 	if len(ctx.Args()) < 1 {
 		utils.Fatalf("This command requires an argument.")