425 lines
9.2 KiB
Go
425 lines
9.2 KiB
Go
package services
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import (
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"archive/zip"
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"context"
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"fmt"
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"io"
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"os"
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"path/filepath"
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"strings"
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"sync"
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"sync/atomic"
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"time"
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"github.com/wailsapp/wails/v3/pkg/services/log"
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)
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// MigrationStatus 迁移状态
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type MigrationStatus string
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const (
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MigrationStatusMigrating MigrationStatus = "migrating"
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MigrationStatusCompleted MigrationStatus = "completed"
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MigrationStatusFailed MigrationStatus = "failed"
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)
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// MigrationProgress 迁移进度信息
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type MigrationProgress struct {
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Status MigrationStatus `json:"status"`
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Progress float64 `json:"progress"`
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Error string `json:"error,omitempty"`
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}
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// MigrationService 迁移服务
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type MigrationService struct {
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logger *log.LoggerService
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mu sync.RWMutex
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progress atomic.Value // stores MigrationProgress
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ctx context.Context
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cancel context.CancelFunc
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}
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// NewMigrationService 创建迁移服务
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func NewMigrationService(logger *log.LoggerService) *MigrationService {
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if logger == nil {
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logger = log.New()
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}
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ms := &MigrationService{
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logger: logger,
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}
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// 初始化进度
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ms.progress.Store(MigrationProgress{
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Status: MigrationStatusCompleted,
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Progress: 0,
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})
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return ms
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}
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// GetProgress 获取当前进度
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func (ms *MigrationService) GetProgress() MigrationProgress {
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return ms.progress.Load().(MigrationProgress)
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}
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// updateProgress 更新进度
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func (ms *MigrationService) updateProgress(progress MigrationProgress) {
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ms.progress.Store(progress)
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}
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// MigrateDirectory 迁移目录
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func (ms *MigrationService) MigrateDirectory(srcPath, dstPath string) error {
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// 创建可取消的上下文
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ctx, cancel := context.WithCancel(context.Background())
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ms.mu.Lock()
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ms.ctx = ctx
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ms.cancel = cancel
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ms.mu.Unlock()
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defer func() {
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ms.mu.Lock()
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ms.cancel = nil
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ms.ctx = nil
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ms.mu.Unlock()
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}()
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// 初始化进度
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ms.updateProgress(MigrationProgress{
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Status: MigrationStatusMigrating,
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Progress: 0,
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})
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// 预检查
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if err := ms.preCheck(srcPath, dstPath); err != nil {
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if err == errNoMigrationNeeded {
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ms.updateProgress(MigrationProgress{
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Status: MigrationStatusCompleted,
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Progress: 100,
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})
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return nil
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}
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return ms.failWithError(err)
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}
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// 执行原子迁移
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if err := ms.atomicMove(ctx, srcPath, dstPath); err != nil {
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return ms.failWithError(err)
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}
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// 迁移完成
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ms.updateProgress(MigrationProgress{
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Status: MigrationStatusCompleted,
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Progress: 100,
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})
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return nil
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}
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var errNoMigrationNeeded = fmt.Errorf("no migration needed")
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// preCheck 预检查
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func (ms *MigrationService) preCheck(srcPath, dstPath string) error {
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// 检查源目录是否存在
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if _, err := os.Stat(srcPath); os.IsNotExist(err) {
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return errNoMigrationNeeded
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}
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// 如果路径相同，不需要迁移
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srcAbs, _ := filepath.Abs(srcPath)
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dstAbs, _ := filepath.Abs(dstPath)
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if srcAbs == dstAbs {
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return errNoMigrationNeeded
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}
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// 检查目标路径是否是源路径的子目录
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if ms.isSubDirectory(srcAbs, dstAbs) {
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return fmt.Errorf("target path cannot be a subdirectory of source path")
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}
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return nil
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}
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// failWithError 失败并记录错误
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func (ms *MigrationService) failWithError(err error) error {
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ms.updateProgress(MigrationProgress{
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Status: MigrationStatusFailed,
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Error: err.Error(),
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})
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return err
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}
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// atomicMove 原子移动目录
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func (ms *MigrationService) atomicMove(ctx context.Context, srcPath, dstPath string) error {
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// 检查是否取消
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select {
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case <-ctx.Done():
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return ctx.Err()
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default:
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}
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// 确保目标目录的父目录存在
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if err := os.MkdirAll(filepath.Dir(dstPath), 0755); err != nil {
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return fmt.Errorf("failed to create target parent directory: %v", err)
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}
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// 检查目标路径
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if err := ms.checkTargetPath(dstPath); err != nil {
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return err
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}
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// 尝试直接重命名
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ms.updateProgress(MigrationProgress{
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Status: MigrationStatusMigrating,
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Progress: 20,
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})
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if err := os.Rename(srcPath, dstPath); err == nil {
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return nil
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}
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// 重命名失败，使用压缩迁移
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ms.updateProgress(MigrationProgress{
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Status: MigrationStatusMigrating,
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Progress: 30,
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})
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return ms.compressMove(ctx, srcPath, dstPath)
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}
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// checkTargetPath 检查目标路径
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func (ms *MigrationService) checkTargetPath(dstPath string) error {
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stat, err := os.Stat(dstPath)
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if os.IsNotExist(err) {
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return nil
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}
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if err != nil {
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return fmt.Errorf("failed to check target path: %v", err)
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}
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if !stat.IsDir() {
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return fmt.Errorf("target path exists but is not a directory")
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}
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isEmpty, err := ms.isDirectoryEmpty(dstPath)
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if err != nil {
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return fmt.Errorf("failed to check target directory: %v", err)
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}
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if !isEmpty {
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return fmt.Errorf("target directory is not empty")
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}
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return nil
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}
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// compressMove 压缩迁移
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func (ms *MigrationService) compressMove(ctx context.Context, srcPath, dstPath string) error {
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tempZipFile := filepath.Join(os.TempDir(),
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fmt.Sprintf("voidraft_migration_%d.zip", time.Now().UnixNano()))
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defer os.Remove(tempZipFile)
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// 压缩源目录
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ms.updateProgress(MigrationProgress{
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Status: MigrationStatusMigrating,
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Progress: 40,
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})
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if err := ms.compressDirectory(ctx, srcPath, tempZipFile); err != nil {
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return fmt.Errorf("failed to compress source directory: %v", err)
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}
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// 解压到目标位置
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ms.updateProgress(MigrationProgress{
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Status: MigrationStatusMigrating,
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Progress: 70,
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})
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if err := ms.extractToDirectory(ctx, tempZipFile, dstPath); err != nil {
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return fmt.Errorf("failed to extract to target location: %v", err)
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}
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// 检查是否取消
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select {
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case <-ctx.Done():
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os.RemoveAll(dstPath)
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return ctx.Err()
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default:
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}
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// 删除源目录
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ms.updateProgress(MigrationProgress{
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Status: MigrationStatusMigrating,
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Progress: 90,
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})
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os.RemoveAll(srcPath)
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return nil
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}
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// compressDirectory 压缩目录到zip文件
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func (ms *MigrationService) compressDirectory(ctx context.Context, srcDir, zipFile string) error {
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zipWriter, err := os.Create(zipFile)
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if err != nil {
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return err
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}
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defer zipWriter.Close()
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zw := zip.NewWriter(zipWriter)
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defer zw.Close()
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return filepath.Walk(srcDir, func(filePath string, info os.FileInfo, err error) error {
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if err != nil {
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return err
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}
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// 检查是否取消
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select {
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case <-ctx.Done():
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return ctx.Err()
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default:
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}
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relPath, err := filepath.Rel(srcDir, filePath)
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if err != nil || relPath == "." {
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return err
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}
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header, err := zip.FileInfoHeader(info)
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if err != nil {
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return err
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}
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header.Name = strings.ReplaceAll(relPath, string(filepath.Separator), "/")
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if info.IsDir() {
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header.Name += "/"
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header.Method = zip.Store
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} else {
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header.Method = zip.Deflate
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}
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writer, err := zw.CreateHeader(header)
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if err != nil {
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return err
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}
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if !info.IsDir() {
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return ms.copyFileToZip(filePath, writer)
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}
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return nil
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})
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}
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// copyFileToZip 复制文件到zip
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func (ms *MigrationService) copyFileToZip(filePath string, writer io.Writer) error {
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file, err := os.Open(filePath)
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if err != nil {
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return err
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}
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defer file.Close()
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_, err = io.Copy(writer, file)
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return err
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}
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// extractToDirectory 从zip文件解压到目录
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func (ms *MigrationService) extractToDirectory(ctx context.Context, zipFile, dstDir string) error {
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reader, err := zip.OpenReader(zipFile)
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if err != nil {
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return err
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}
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defer reader.Close()
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if err := os.MkdirAll(dstDir, 0755); err != nil {
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return err
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}
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for _, file := range reader.File {
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// 检查是否取消
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select {
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case <-ctx.Done():
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return ctx.Err()
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default:
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}
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if err := ms.extractSingleFile(file, dstDir); 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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// extractSingleFile 解压单个文件
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func (ms *MigrationService) extractSingleFile(file *zip.File, dstDir string) error {
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dstPath := filepath.Join(dstDir, file.Name)
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// 安全检查：防止zip slip攻击
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if !strings.HasPrefix(dstPath, filepath.Clean(dstDir)+string(os.PathSeparator)) {
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return fmt.Errorf("invalid file path in archive: %s", file.Name)
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}
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if file.FileInfo().IsDir() {
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return os.MkdirAll(dstPath, file.FileInfo().Mode())
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}
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if err := os.MkdirAll(filepath.Dir(dstPath), 0755); err != nil {
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return err
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}
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srcFile, err := file.Open()
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if err != nil {
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return err
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}
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defer srcFile.Close()
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dstFile, err := os.OpenFile(dstPath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, file.FileInfo().Mode())
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if err != nil {
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return err
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}
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defer dstFile.Close()
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_, err = io.Copy(dstFile, srcFile)
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return err
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}
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// isDirectoryEmpty 检查目录是否为空
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func (ms *MigrationService) isDirectoryEmpty(dirPath string) (bool, error) {
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f, err := os.Open(dirPath)
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if err != nil {
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return false, err
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}
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defer f.Close()
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_, err = f.Readdir(1)
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return err == io.EOF, nil
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}
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// isSubDirectory 检查target是否是parent的子目录
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func (ms *MigrationService) isSubDirectory(parent, target string) bool {
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parent = filepath.Clean(parent) + string(filepath.Separator)
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target = filepath.Clean(target) + string(filepath.Separator)
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return len(target) > len(parent) && strings.HasPrefix(target, parent)
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}
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// CancelMigration 取消迁移
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func (ms *MigrationService) CancelMigration() error {
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ms.mu.Lock()
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defer ms.mu.Unlock()
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if ms.cancel != nil {
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ms.cancel()
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return nil
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}
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return fmt.Errorf("no active migration to cancel")
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}
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// ServiceShutdown 服务关闭
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func (ms *MigrationService) ServiceShutdown() error {
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ms.CancelMigration()
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return nil
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}
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