08326794e8
This change refactors stacktrie to separate the stacktrie itself from the internal representation of nodes: a stacktrie is not a recursive structure of stacktries, rather, a framework for representing and operating upon a set of nodes. --------- Co-authored-by: Gary Rong <garyrong0905@gmail.com>
121 lines
2.8 KiB
Go
121 lines
2.8 KiB
Go
// Copyright 2023 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package trie
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import (
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"bufio"
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"bytes"
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"encoding"
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"encoding/gob"
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)
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// Compile-time interface checks.
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var (
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_ = encoding.BinaryMarshaler((*StackTrie)(nil))
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_ = encoding.BinaryUnmarshaler((*StackTrie)(nil))
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)
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// NewFromBinaryV2 initialises a serialized stacktrie with the given db.
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// OBS! Format was changed along with the name of this constructor.
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func NewFromBinaryV2(data []byte) (*StackTrie, error) {
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stack := NewStackTrie(nil)
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if err := stack.UnmarshalBinary(data); err != nil {
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return nil, err
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}
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return stack, nil
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}
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// MarshalBinary implements encoding.BinaryMarshaler.
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func (t *StackTrie) MarshalBinary() (data []byte, err error) {
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var (
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b bytes.Buffer
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w = bufio.NewWriter(&b)
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)
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if err := gob.NewEncoder(w).Encode(t.owner); err != nil {
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return nil, err
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}
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if err := t.root.marshalInto(w); err != nil {
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return nil, err
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}
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w.Flush()
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return b.Bytes(), nil
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}
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// UnmarshalBinary implements encoding.BinaryUnmarshaler.
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func (t *StackTrie) UnmarshalBinary(data []byte) error {
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r := bytes.NewReader(data)
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if err := gob.NewDecoder(r).Decode(&t.owner); err != nil {
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return err
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}
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if err := t.root.unmarshalFrom(r); err != nil {
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return err
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}
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return nil
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}
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type stackNodeMarshaling struct {
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Typ uint8
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Key []byte
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Val []byte
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}
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func (n *stNode) marshalInto(w *bufio.Writer) (err error) {
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enc := stackNodeMarshaling{
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Typ: n.typ,
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Key: n.key,
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Val: n.val,
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}
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if err := gob.NewEncoder(w).Encode(enc); err != nil {
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return err
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}
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for _, child := range n.children {
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if child == nil {
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w.WriteByte(0)
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continue
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}
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w.WriteByte(1)
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if err := child.marshalInto(w); err != nil {
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return err
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}
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}
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return nil
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}
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func (n *stNode) unmarshalFrom(r *bytes.Reader) error {
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var dec stackNodeMarshaling
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if err := gob.NewDecoder(r).Decode(&dec); err != nil {
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return err
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}
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n.typ = dec.Typ
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n.key = dec.Key
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n.val = dec.Val
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for i := range n.children {
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if b, err := r.ReadByte(); err != nil {
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return err
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} else if b == 0 {
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continue
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}
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var child stNode
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if err := child.unmarshalFrom(r); err != nil {
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return err
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}
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n.children[i] = &child
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}
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return nil
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}
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