t8n/evm: add new cli command

Signed-off-by: Ignacio Hagopian <[email protected]>

cmd/evm/internal/t8ntool/transition.go

@@ -548,13 +548,65 @@ func VerkleKeys(ctx *cli.Context) error {
 		}
 	}
 
+	vkt, err := genVktFromAlloc(alloc)
+	if err != nil {
+		return fmt.Errorf("error generating vkt: %w", err)
+	}
+
+	collector := make(map[common.Hash]hexutil.Bytes)
+	it, err := vkt.NodeIterator(nil)
+	if err != nil {
+		panic(err)
+	}
+	for it.Next(true) {
+		if it.Leaf() {
+			collector[common.BytesToHash(it.LeafKey())] = it.LeafBlob()
+		}
+	}
+
+	output, err := json.MarshalIndent(collector, "", "")
+	if err != nil {
+		return fmt.Errorf("error outputting tree: %w", err)
+	}
+
+	fmt.Println(string(output))
+
+	return nil
+}
+
+// VerkleRoot computes the root of a VKT from a genesis alloc.
+func VerkleRoot(ctx *cli.Context) error {
+	var allocStr = ctx.String(InputAllocFlag.Name)
+	var alloc core.GenesisAlloc
+	if allocStr == stdinSelector {
+		decoder := json.NewDecoder(os.Stdin)
+		if err := decoder.Decode(&alloc); err != nil {
+			return NewError(ErrorJson, fmt.Errorf("failed unmarshaling stdin: %v", err))
+		}
+	}
+	if allocStr != stdinSelector {
+		if err := readFile(allocStr, "alloc", &alloc); err != nil {
+			return err
+		}
+	}
+
+	vkt, err := genVktFromAlloc(alloc)
+	if err != nil {
+		return fmt.Errorf("error generating vkt: %w", err)
+	}
+	fmt.Println(vkt.Hash())
+
+	return nil
+}
+
+func genVktFromAlloc(alloc core.GenesisAlloc) (*trie.VerkleTrie, error) {
 	vkt := trie.NewVerkleTrie(verkle.New(), trie.NewDatabase(rawdb.NewMemoryDatabase()), utils.NewPointCache(), true)
 
 	for addr, acc := range alloc {
 		for slot, value := range acc.Storage {
 			err := vkt.UpdateStorage(addr, slot.Bytes(), value.Big().Bytes())
 			if err != nil {
-				return fmt.Errorf("error inserting storage: %w", err)
+				return nil, fmt.Errorf("error inserting storage: %w", err)
 			}
 		}
 
@@ -566,34 +618,15 @@ func VerkleKeys(ctx *cli.Context) error {
 		}
 		err := vkt.UpdateAccount(addr, account)
 		if err != nil {
-			return fmt.Errorf("error inserting account: %w", err)
+			return nil, fmt.Errorf("error inserting account: %w", err)
 		}
 
 		err = vkt.UpdateContractCode(addr, common.BytesToHash(account.CodeHash), acc.Code)
 		if err != nil {
-			return fmt.Errorf("error inserting code: %w", err)
-		}
-	}
-
-	collector := make(map[common.Hash]hexutil.Bytes)
-	it, err := vkt.NodeIterator(nil)
-	if err != nil {
-		panic(err)
-	}
-	for it.Next(true) {
-		if it.Leaf() {
-			collector[common.BytesToHash(it.LeafKey())] = it.LeafBlob()
+			return nil, fmt.Errorf("error inserting code: %w", err)
 		}
 	}
-
-	output, err := json.MarshalIndent(collector, "", "")
-	if err != nil {
-		return fmt.Errorf("error outputting tree: %w", err)
-	}
-
-	fmt.Println(string(output))
-
-	return nil
+	return vkt, nil
 }
 
 // VerkleCodeChunkKey computes the tree key of a code-chunk for a given address.

cmd/evm/main.go

@@ -188,6 +188,15 @@ var verkleCommand = &cli.Command{
 			Usage:   "chunkify a given bytecode",
 			Action:  t8ntool.VerkleChunkifyCode,
 		},
+		{
+			Name:    "root",
+			Aliases: []string{"VR"},
+			Usage:   "compute the root of a verkle tree for the given alloc",
+			Action:  t8ntool.VerkleRoot,
+			Flags: []cli.Flag{
+				t8ntool.InputAllocFlag,
+			},
+		},
 	},
 }