core, trie: decode the value for storage dump (ethereum#19943)

* core, trie: decode the value for storage dump

* core/state: address comment

Author: rjl493456442

core/state/dump.go

@@ -118,7 +118,12 @@ func (self *StateDB) dump(c collector, excludeCode, excludeStorage, excludeMissi
 			account.Storage = make(map[common.Hash]string)
 			storageIt := trie.NewIterator(obj.getTrie(self.db).NodeIterator(nil))
 			for storageIt.Next() {
-				account.Storage[common.BytesToHash(self.trie.GetKey(storageIt.Key))] = common.Bytes2Hex(storageIt.Value)
+				_, content, _, err := rlp.Split(storageIt.Value)
+				if err != nil {
+					log.Error("Failed to decode the value returned by iterator", "error", err)
+					continue
+				}
+				account.Storage[common.BytesToHash(self.trie.GetKey(storageIt.Key))] = common.Bytes2Hex(content)
 			}
 		}
 		c.onAccount(addr, account)

trie/iterator.go

@@ -34,7 +34,9 @@ type Iterator struct {
 	Err   error
 }
 
-// NewIterator creates a new key-value iterator from a node iterator
+// NewIterator creates a new key-value iterator from a node iterator.
+// Note that the value returned by the iterator is raw. If the content is encoded
+// (e.g. storage value is RLP-encoded), it's caller's duty to decode it.
 func NewIterator(it NodeIterator) *Iterator {
 	return &Iterator{
 		nodeIt: it,