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148 lines
3.1 KiB
148 lines
3.1 KiB
package nodes
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import (
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"encoding/json"
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"os"
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"path/filepath"
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"sync"
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"go.uber.org/zap"
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)
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// RaftStorage 结构，持久化 currentTerm、votedFor 和 logEntries
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type RaftStorage struct {
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mu sync.Mutex
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filePath string
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CurrentTerm int `json:"current_term"`
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VotedFor string `json:"voted_for"`
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LogEntries []RaftLogEntry `json:"log_entries"`
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}
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// NewRaftStorage 创建 Raft 存储
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func NewRaftStorage(filePath string) *RaftStorage {
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storage := &RaftStorage{
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filePath: filePath,
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}
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storage.loadData() // 载入已有数据
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return storage
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}
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// loadData 读取 JSON 文件数据
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func (rs *RaftStorage) loadData() {
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rs.mu.Lock()
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defer rs.mu.Unlock()
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file, err := os.Open(rs.filePath)
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if err != nil {
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log.Info("文件未创建：" + rs.filePath)
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rs.saveData() // 文件不存在时创建默认数据
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return
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}
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defer file.Close()
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err = json.NewDecoder(file).Decode(rs)
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if err != nil {
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log.Error("读取文件失败：" + rs.filePath, zap.Error(err))
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}
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}
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// 持久化数据到 JSON(必须持有锁，不能直接外部调用)
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func (rs *RaftStorage) saveData() {
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// 获取文件所在的目录
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dir := filepath.Dir(rs.filePath)
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// 确保目录存在
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if err := os.MkdirAll(dir, 0755); err != nil {
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log.Error("创建存储目录失败", zap.Error(err))
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return
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}
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file, err := os.Create(rs.filePath)
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if err != nil {
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log.Error("持久化节点出错", zap.Error(err))
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return
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}
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defer file.Close()
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err = json.NewEncoder(file).Encode(rs)
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if err != nil {
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log.Error("持久化写入失败")
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}
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}
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// SetCurrentTerm 设置当前 term，并清空 votedFor（符合 Raft 规范）
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func (rs *RaftStorage) SetCurrentTerm(term int) {
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rs.mu.Lock()
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defer rs.mu.Unlock()
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if term > rs.CurrentTerm {
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rs.CurrentTerm = term
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rs.VotedFor = "" // 新任期清空投票
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rs.saveData()
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}
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}
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// GetCurrentTerm 获取当前 term
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func (rs *RaftStorage) GetCurrentTerm() int {
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rs.mu.Lock()
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defer rs.mu.Unlock()
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return rs.CurrentTerm
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}
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// SetVotedFor 记录投票给谁
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func (rs *RaftStorage) SetVotedFor(candidate string) {
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rs.mu.Lock()
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defer rs.mu.Unlock()
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rs.VotedFor = candidate
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rs.saveData()
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}
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// GetVotedFor 获取投票对象
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func (rs *RaftStorage) GetVotedFor() string {
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rs.mu.Lock()
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defer rs.mu.Unlock()
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return rs.VotedFor
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}
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// 同时设置
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func (rs *RaftStorage) SetTermAndVote(term int, candidate string) {
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rs.mu.Lock()
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defer rs.mu.Unlock()
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rs.VotedFor = candidate
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rs.CurrentTerm = term
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rs.saveData()
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}
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// append日志
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func (rs *RaftStorage) AppendLog(rlogE RaftLogEntry) {
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rs.mu.Lock()
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defer rs.mu.Unlock()
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rs.LogEntries = append(rs.LogEntries, rlogE)
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rs.saveData()
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}
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// 更改日志
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func (rs *RaftStorage) WriteLog(rlogEs []RaftLogEntry) {
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rs.mu.Lock()
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defer rs.mu.Unlock()
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rs.LogEntries = rlogEs
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rs.saveData()
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}
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// 获取所有日志
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func (rs *RaftStorage) GetLogEntries() []RaftLogEntry {
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rs.mu.Lock()
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defer rs.mu.Unlock()
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return rs.LogEntries
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}
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// GetLastLogIndex 获取最新日志的 index
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func (rs *RaftStorage) GetLastLogIndex() int {
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rs.mu.Lock()
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defer rs.mu.Unlock()
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if len(rs.LogEntries) == 0 {
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return 0
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}
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return len(rs.LogEntries)-1
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}
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