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|
package admin
import (
"encoding/json"
"log"
"os"
"path/filepath"
"sync"
"time"
)
type ChangeDesc struct {
Time string `json:"time"`
Description string `json:"description"`
FilePath string `json:"file_path"`
NewFilePath string `json:"new_file_path,omitempty"`
OldContent []byte `json:"old_content"`
NewContent []byte `json:"new_content"`
IsDelete bool `json:"is_delete"`
IsCreate bool `json:"is_create"`
}
type UndoInfo struct {
CanUndo bool `json:"can_undo"`
CanRedo bool `json:"can_redo"`
UndoDesc string `json:"undo_desc"`
RedoDesc string `json:"redo_desc"`
StackSize int `json:"stack_size"`
RedoSize int `json:"redo_size"`
}
type UndoStack struct {
mu sync.Mutex
dataDir string
history []ChangeDesc
redo []ChangeDesc
maxSize int
filePath string
}
func NewUndoStack(dataDir string) *UndoStack {
us := &UndoStack{
dataDir: dataDir,
maxSize: 100,
filePath: filepath.Join(dataDir, ".admin_history.json"),
}
us.load()
return us
}
func (us *UndoStack) Push(desc ChangeDesc) {
us.mu.Lock()
defer us.mu.Unlock()
desc.Time = time.Now().Format(time.RFC3339)
us.history = append(us.history, desc)
us.redo = nil
if len(us.history) > us.maxSize {
us.history = us.history[len(us.history)-us.maxSize:]
}
us.save()
}
func (us *UndoStack) Undo() *ChangeDesc {
us.mu.Lock()
defer us.mu.Unlock()
if len(us.history) == 0 {
return nil
}
last := us.history[len(us.history)-1]
us.history = us.history[:len(us.history)-1]
if last.NewFilePath != "" {
os.Remove(last.NewFilePath)
}
if last.IsDelete {
if err := os.WriteFile(last.FilePath, last.OldContent, 0644); err != nil {
log.Printf("undo: failed to restore deleted file %s: %v", last.FilePath, err)
return nil
}
} else if last.IsCreate {
os.Remove(last.FilePath)
} else {
if last.NewFilePath != "" {
if err := os.WriteFile(last.FilePath, last.OldContent, 0644); err != nil {
log.Printf("undo: failed to revert move %s: %v", last.FilePath, err)
return nil
}
} else {
if err := os.WriteFile(last.FilePath, last.OldContent, 0644); err != nil {
log.Printf("undo: failed to revert file %s: %v", last.FilePath, err)
return nil
}
}
}
us.redo = append(us.redo, last)
us.save()
return &last
}
func (us *UndoStack) Redo() *ChangeDesc {
us.mu.Lock()
defer us.mu.Unlock()
if len(us.redo) == 0 {
return nil
}
last := us.redo[len(us.redo)-1]
us.redo = us.redo[:len(us.redo)-1]
if last.NewFilePath != "" {
os.Remove(last.FilePath)
}
if last.IsCreate {
if last.NewFilePath != "" {
if err := os.WriteFile(last.NewFilePath, last.NewContent, 0644); err != nil {
log.Printf("redo: failed to recreate file %s: %v", last.NewFilePath, err)
return nil
}
} else {
if err := os.WriteFile(last.FilePath, last.NewContent, 0644); err != nil {
log.Printf("redo: failed to recreate file %s: %v", last.FilePath, err)
return nil
}
}
} else if last.IsDelete {
os.Remove(last.FilePath)
} else {
if last.NewFilePath != "" {
if err := os.WriteFile(last.NewFilePath, last.NewContent, 0644); err != nil {
log.Printf("redo: failed to reapply move %s: %v", last.NewFilePath, err)
return nil
}
} else {
if err := os.WriteFile(last.FilePath, last.NewContent, 0644); err != nil {
log.Printf("redo: failed to reapply file %s: %v", last.FilePath, err)
return nil
}
}
}
us.history = append(us.history, last)
us.save()
return &last
}
func (us *UndoStack) Info() UndoInfo {
us.mu.Lock()
defer us.mu.Unlock()
info := UndoInfo{
StackSize: len(us.history),
RedoSize: len(us.redo),
}
if len(us.history) > 0 {
info.CanUndo = true
info.UndoDesc = us.history[len(us.history)-1].Description
}
if len(us.redo) > 0 {
info.CanRedo = true
info.RedoDesc = us.redo[len(us.redo)-1].Description
}
return info
}
func (us *UndoStack) save() {
type entry struct {
Time string `json:"time"`
Description string `json:"description"`
FilePath string `json:"file_path"`
NewFilePath string `json:"new_file_path,omitempty"`
OldContent string `json:"old_content"`
NewContent string `json:"new_content"`
IsDelete bool `json:"is_delete"`
IsCreate bool `json:"is_create"`
}
type saveData struct {
History []entry `json:"history"`
Redo []entry `json:"redo"`
}
toEntries := func(changes []ChangeDesc) []entry {
var entries []entry
for _, c := range changes {
entries = append(entries, entry{
Time: c.Time,
Description: c.Description,
FilePath: c.FilePath,
NewFilePath: c.NewFilePath,
OldContent: string(c.OldContent),
NewContent: string(c.NewContent),
IsDelete: c.IsDelete,
IsCreate: c.IsCreate,
})
}
return entries
}
data := saveData{
History: toEntries(us.history),
Redo: toEntries(us.redo),
}
b, err := json.Marshal(data)
if err != nil {
log.Printf("undo: failed to marshal history: %v", err)
return
}
os.WriteFile(us.filePath, b, 0644)
}
func (us *UndoStack) load() {
data, err := os.ReadFile(us.filePath)
if err != nil {
return
}
type entry struct {
Time string `json:"time"`
Description string `json:"description"`
FilePath string `json:"file_path"`
NewFilePath string `json:"new_file_path,omitempty"`
OldContent string `json:"old_content"`
NewContent string `json:"new_content"`
IsDelete bool `json:"is_delete"`
IsCreate bool `json:"is_create"`
}
var saveData struct {
History []entry `json:"history"`
Redo []entry `json:"redo"`
}
if err := json.Unmarshal(data, &saveData); err != nil {
return
}
fromEntries := func(entries []entry) []ChangeDesc {
var changes []ChangeDesc
for _, e := range entries {
changes = append(changes, ChangeDesc{
Time: e.Time,
Description: e.Description,
FilePath: e.FilePath,
NewFilePath: e.NewFilePath,
OldContent: []byte(e.OldContent),
NewContent: []byte(e.NewContent),
IsDelete: e.IsDelete,
IsCreate: e.IsCreate,
})
}
return changes
}
us.history = fromEntries(saveData.History)
us.redo = fromEntries(saveData.Redo)
}
|
