Merge pull request #3153 from fjl/trie-unload-fix

trie: improve cache unloading mechanism

trie/trie.go

@@ -105,13 +105,11 @@ func New(root common.Hash, db Database) (*Trie, error) {
 		if db == nil {
 			panic("trie.New: cannot use existing root without a database")
 		}
-		if v, _ := trie.db.Get(root[:]); len(v) == 0 {
-			return nil, &MissingNodeError{
-				RootHash: root,
-				NodeHash: root,
-			}
+		rootnode, err := trie.resolveHash(root[:], nil, nil)
+		if err != nil {
+			return nil, err
 		}
-		trie.root = hashNode(root.Bytes())
+		trie.root = rootnode
 	}
 	return trie, nil
 }
@@ -158,14 +156,15 @@ func (t *Trie) tryGet(origNode node, key []byte, pos int) (value []byte, newnode
 		if err == nil && didResolve {
 			n = n.copy()
 			n.Val = newnode
+			n.flags.gen = t.cachegen
 		}
 		return value, n, didResolve, err
 	case *fullNode:
 		value, newnode, didResolve, err = t.tryGet(n.Children[key[pos]], key, pos+1)
 		if err == nil && didResolve {
 			n = n.copy()
+			n.flags.gen = t.cachegen
 			n.Children[key[pos]] = newnode
-
 		}
 		return value, n, didResolve, err
 	case hashNode:
@@ -261,7 +260,8 @@ func (t *Trie) insert(n node, prefix, key []byte, value node) (bool, node, error
 			return false, n, err
 		}
 		n = n.copy()
-		n.Children[key[0]], n.flags.hash, n.flags.dirty = nn, nil, true
+		n.flags = t.newFlag()
+		n.Children[key[0]] = nn
 		return true, n, nil
 
 	case nil:
@@ -345,7 +345,8 @@ func (t *Trie) delete(n node, prefix, key []byte) (bool, node, error) {
 			return false, n, err
 		}
 		n = n.copy()
-		n.Children[key[0]], n.flags.hash, n.flags.dirty = nn, nil, true
+		n.flags = t.newFlag()
+		n.Children[key[0]] = nn
 
 		// Check how many non-nil entries are left after deleting and
 		// reduce the full node to a short node if only one entry is
@@ -443,7 +444,7 @@ func (t *Trie) resolveHash(n hashNode, prefix, suffix []byte) (node, error) {
 			SuffixLen: len(suffix),
 		}
 	}
-	dec := mustDecodeNode(n, enc)
+	dec := mustDecodeNode(n, enc, t.cachegen)
 	return dec, nil
 }